fallow_cli/report/

github_summary.rs

//! `--format github-summary`: GitHub Actions job-summary markdown, written
//! by workflows as `fallow ... --format github-summary >> "$GITHUB_STEP_SUMMARY"`.
//!
//! Sections, ordering, and truncation caps were first ported from the bundled
//! action's jq renderers (`action/jq/summary-{check,dupes,health,audit,
//! security,fix,combined}.jq`). This renderer is now the source of truth for
//! fallow 3.4.2 and later. The action keeps the jq files as frozen legacy
//! renderers for older binaries, so new issue kinds go here and not into the
//! jq files (`summary-fix.jq` still serves `fix` on every version). Deviations
//! from the jq layer: em dashes in
//! the jq templates render as plain hyphens (repo style rule), and the
//! combined view's dupes file links read `GH_REPO` / `GITHUB_REPOSITORY` and
//! `PR_HEAD_SHA` / `GITHUB_SHA` (the jq layer read only the action-set
//! `GH_REPO` / `PR_HEAD_SHA`), with the link path prefix coming from the
//! path-rebase resolution instead of the action-set `PREFIX` env var.
//!
//! Like the annotations renderer, this is value-driven over the `--format
//! json` envelope, which keeps `fallow report --from` output byte-identical
//! to the direct format run.

use std::fmt::Write as _;
use std::path::Path;
use std::process::ExitCode;

use fallow_output::{markdown_code_span, markdown_table_code_span, markdown_table_text};
use fallow_types::output_dead_code::caveat_labels_for_tokens;
use serde_json::Value;

use super::github::{PathRebase, arr, b, fmt_num, num, resolve_render_options, s, u};
use super::github_annotations::EnvelopeKind;
use crate::report::sink::outln;

const DEAD_CODE_DOCS: &str = "https://docs.fallow.tools/explanations/dead-code";
const HEALTH_DOCS: &str = "https://docs.fallow.tools/explanations/health";
const DUPES_DOCS: &str = "https://docs.fallow.tools/explanations/duplication";
const SUPPRESSION_DOCS: &str = "https://docs.fallow.tools/configuration/suppression";

/// Environment-derived context for the combined view's dupes file links.
#[derive(Debug, Default, Clone)]
pub struct LinkContext {
    /// Repo-root path prefix for link targets (empty or `dir/` with a
    /// trailing slash).
    pub prefix: String,
    /// `owner/repo`; links render as plain code when empty.
    pub repo: String,
    /// Head commit SHA; links render as plain code when empty.
    pub sha: String,
}

impl LinkContext {
    /// Resolve from the workflow environment plus the path-rebase offset.
    #[must_use]
    pub(crate) fn from_env(rebase: &PathRebase) -> Self {
        let env = |primary: &str, fallback: &str| {
            std::env::var(primary)
                .or_else(|_| std::env::var(fallback))
                .unwrap_or_default()
        };
        let prefix = match rebase {
            PathRebase::None => String::new(),
            PathRebase::Prefix(prefix) => format!("{prefix}/"),
        };
        Self {
            prefix,
            repo: env("GH_REPO", "GITHUB_REPOSITORY"),
            sha: env("PR_HEAD_SHA", "GITHUB_SHA"),
        }
    }
}

/// Render and print the job-summary markdown for one envelope.
pub(crate) fn print_summary(kind: EnvelopeKind, envelope: &Value, root: &Path) -> ExitCode {
    let options = resolve_render_options(root);
    let links = LinkContext::from_env(&options.rebase);
    outln!("{}", render_summary(kind, envelope, &links));
    // The unmatched config patterns follow the findings, as in `--format
    // markdown`. The section reads the envelope, so a live summary and one
    // from `fallow report --from` list the same patterns.
    if let Some(section) = crate::report::config_pattern_text::markdown_section(
        &crate::report::config_pattern_text::envelope_diagnostics(envelope),
    ) {
        outln!("{section}");
    }
    // Appended rather than folded into each per-kind renderer: the verdict is
    // one fact about the run, not a section of the report, and every kind
    // reports it the same way.
    if let Some(line) = crate::report::gate_outcome_text::summary_line(envelope) {
        outln!("");
        outln!("{line}");
    }
    // Same reasoning, one fact further: whether the run did what it was asked
    // belongs beside what it concluded, not inside a per-kind section.
    if let Some(line) = crate::report::request_outcome_text::summary_line(envelope) {
        outln!("");
        outln!("{line}");
    }
    ExitCode::SUCCESS
}

/// Render the fix envelope's job summary directly from `fallow fix`. The fix
/// envelope has no `kind` field; `fallow report --from` reaches the same
/// renderer via [`EnvelopeKind::Fix`] (resolved by field detection), while the
/// live `fallow fix` command calls this entry point.
pub(crate) fn print_fix_summary(envelope: &Value) -> ExitCode {
    outln!("{}", render_fix_summary(envelope));
    ExitCode::SUCCESS
}

/// Pure renderer, dispatching on the envelope family.
#[must_use]
pub fn render_summary(kind: EnvelopeKind, envelope: &Value, links: &LinkContext) -> String {
    match kind {
        EnvelopeKind::DeadCode => render_check_summary(envelope),
        EnvelopeKind::Dupes => render_dupes_summary(envelope),
        EnvelopeKind::Health => render_health_summary(envelope),
        EnvelopeKind::Audit => render_audit_summary(envelope),
        EnvelopeKind::Security => render_security_summary(envelope),
        EnvelopeKind::Combined => render_combined_summary(envelope, links),
        EnvelopeKind::Fix => render_fix_summary(envelope),
    }
}

// ---------------------------------------------------------------------------
// Shared numeric / path helpers (jq `pct`, `signed`, `rel_path`).
// ---------------------------------------------------------------------------

/// jq `pct`: `. * 10 | round / 10`, interpolated without a trailing `.0`.
fn pct(value: f64) -> String {
    let rounded = (value * 10.0).round() / 10.0;
    fmt_num(&serde_json::json!(rounded))
}

/// jq `signed`: `+x` for positive, plain for negative, `0.0` for zero.
fn signed(value: f64) -> String {
    if value > 0.0 {
        format!("+{}", pct(value))
    } else if value < 0.0 {
        pct(value)
    } else {
        "0.0".to_owned()
    }
}

fn opt_f(value: &Value, key: &str) -> Option<f64> {
    value.get(key).and_then(Value::as_f64)
}

fn f_or_zero(value: &Value, key: &str) -> f64 {
    opt_f(value, key).unwrap_or_default()
}

/// jq `rel_path` (audit/security flavor): shorten only absolute paths to
/// their last three segments.
fn rel_path_absolute_only(path: &str) -> String {
    if path.starts_with('/') {
        last_three_segments(path)
    } else {
        path.to_owned()
    }
}

/// jq `rel_path` (combined flavor): always shorten to the last three
/// segments.
fn last_three_segments(path: &str) -> String {
    let segments: Vec<&str> = path.split('/').collect();
    if segments.len() > 3 {
        segments[segments.len() - 3..].join("/")
    } else {
        segments.join("/")
    }
}

/// jq `plural(n; word)`.
fn plural_n(n: usize, word: &str) -> String {
    let suffix = if n == 1 { "" } else { "s" };
    format!("{n} {word}{suffix}")
}

fn str_or<'v>(value: &'v Value, key: &str, default: &'v str) -> &'v str {
    value.get(key).and_then(Value::as_str).unwrap_or(default)
}

/// `` `path` `` / `` `path:line` `` with the jq truthiness gate: the `:line`
/// suffix renders whenever `line` is present and non-null (0 included).
fn path_line(item: &Value) -> String {
    let path = rel_path_absolute_only(s(item, "path"));
    match item.get("line").filter(|line| !line.is_null()) {
        Some(line) => markdown_table_code_span(&format!("{path}:{}", fmt_num(line))),
        None => markdown_table_code_span(&path),
    }
}

/// Escaped code-span table cell for an untrusted envelope string.
fn code_cell(item: &Value, key: &str) -> String {
    markdown_table_code_span(s(item, key))
}

/// The italic caveat marker appended inside a dead-code table cell when the
/// verdict behind the row rests on a file this run never fully read. Empty when
/// the finding carries no `reachability_caveats[]`, so a clean run's summary is
/// byte-identical to what it was before this hedge existed.
///
/// The job summary is where a reviewer decides what to delete, so the row that
/// names the finding is the row that has to carry the qualifier. It rides
/// inside an existing cell rather than in a new column: adding a column would
/// change every table's shape, including the rows that carry no caveat.
fn caveat_cell_suffix(item: &Value) -> String {
    caveat_labels_for_tokens(arr(item, "reachability_caveats").filter_map(Value::as_str))
        .map_or_else(String::new, |labels| {
            format!(" *(caveat: {})*", markdown_table_text(&labels))
        })
}

/// `` `path:line` `` cell with the audit-flavor path shortening.
fn rel_path_line_cell(item: &Value, path_key: &str) -> String {
    markdown_table_code_span(&format!(
        "{}:{}",
        rel_path_absolute_only(s(item, path_key)),
        num(item, "line")
    ))
}

fn backtick_join(item: &Value, key: &str) -> String {
    arr(item, key)
        .filter_map(Value::as_str)
        .map(markdown_table_code_span)
        .collect::<Vec<_>>()
        .join(", ")
}

// ---------------------------------------------------------------------------
// Dead-code category table (shared by the check summary and the combined
// code-issues breakdown). Labels, result keys, and docs anchors come from the
// issue registry; a unit test below holds the two equal.
// ---------------------------------------------------------------------------

const DEAD_CODE_CATEGORIES: &[(&str, &str, &str)] = &[
    ("Unused files", "unused_files", "unused-files"),
    ("Unused exports", "unused_exports", "unused-exports"),
    ("Unused types", "unused_types", "unused-types"),
    (
        "Private type leaks",
        "private_type_leaks",
        "private-type-leaks",
    ),
    (
        "Deprecated exports in use",
        "deprecated_exports_in_use",
        "deprecated-exports-in-use",
    ),
    (
        "Unused dependencies",
        "unused_dependencies",
        "unused-dependencies",
    ),
    (
        "Unused devDependencies",
        "unused_dev_dependencies",
        "unused-dependencies",
    ),
    (
        "Unused optionalDependencies",
        "unused_optional_dependencies",
        "unused-dependencies",
    ),
    (
        "Unused enum members",
        "unused_enum_members",
        "unused-enum-members",
    ),
    (
        "Unused class members",
        "unused_class_members",
        "unused-class-members",
    ),
    (
        "Unused store members",
        "unused_store_members",
        "unused-store-members",
    ),
    (
        "Unresolved imports",
        "unresolved_imports",
        "unresolved-imports",
    ),
    (
        "Unlisted dependencies",
        "unlisted_dependencies",
        "unlisted-dependencies",
    ),
    (
        "Duplicate exports",
        "duplicate_exports",
        "duplicate-exports",
    ),
    (
        "Circular dependencies",
        "circular_dependencies",
        "circular-dependencies",
    ),
    ("Re-export cycles", "re_export_cycles", "re-export-cycles"),
    ("Package cycles", "package_cycles", "package-cycles"),
    (
        "Boundary violations",
        "boundary_violations",
        "boundary-violations",
    ),
    (
        "Boundary coverage",
        "boundary_coverage_violations",
        "boundary-violations",
    ),
    (
        "Boundary calls",
        "boundary_call_violations",
        "boundary-violations",
    ),
    (
        "Policy violations",
        "policy_violations",
        "policy-violations",
    ),
    (
        "Invalid client exports",
        "invalid_client_exports",
        "invalid-client-exports",
    ),
    (
        "Mixed client/server barrels",
        "mixed_client_server_barrels",
        "mixed-client-server-barrels",
    ),
    (
        "Misplaced directives",
        "misplaced_directives",
        "misplaced-directives",
    ),
    (
        "Unused server actions",
        "unused_server_actions",
        "unused-server-action",
    ),
    ("Route collisions", "route_collisions", "route-collisions"),
    (
        "Dynamic segment conflicts",
        "dynamic_segment_name_conflicts",
        "dynamic-segment-name-conflicts",
    ),
    (
        "Unrendered components",
        "unrendered_components",
        "unrendered-component",
    ),
    (
        "Unused component props",
        "unused_component_props",
        "unused-component-prop",
    ),
    (
        "Unused component emits",
        "unused_component_emits",
        "unused-component-emit",
    ),
    (
        "Unused component inputs",
        "unused_component_inputs",
        "unused-component-input",
    ),
    (
        "Unused component outputs",
        "unused_component_outputs",
        "unused-component-output",
    ),
    (
        "Unused Svelte events",
        "unused_svelte_events",
        "unused-svelte-event",
    ),
    (
        "Unprovided injects",
        "unprovided_injects",
        "unprovided-inject",
    ),
    (
        "Unused load data keys",
        "unused_load_data_keys",
        "unused-load-data-key",
    ),
    (
        "Type-only dependencies",
        "type_only_dependencies",
        "type-only-dependencies",
    ),
    (
        "Test-only dependencies",
        "test_only_dependencies",
        "test-only-dependencies",
    ),
    (
        "Dev dependencies used in production",
        "dev_dependencies_in_production",
        "dev-dependencies-in-production",
    ),
    (
        "Stale suppressions",
        "stale_suppressions",
        "stale-suppressions",
    ),
    (
        "Unused catalog entries",
        "unused_catalog_entries",
        "unused-catalog-entries",
    ),
    (
        "Empty catalog groups",
        "empty_catalog_groups",
        "empty-catalog-groups",
    ),
    (
        "Unresolved catalog references",
        "unresolved_catalog_references",
        "unresolved-catalog-references",
    ),
    (
        "Unused dependency overrides",
        "unused_dependency_overrides",
        "unused-dependency-overrides",
    ),
    (
        "Misconfigured dependency overrides",
        "misconfigured_dependency_overrides",
        "misconfigured-dependency-overrides",
    ),
];

fn dead_code_docs(anchor: &str) -> String {
    format!("{DEAD_CODE_DOCS}#{anchor}")
}

fn dead_code_category_table(env: &Value) -> String {
    DEAD_CODE_CATEGORIES
        .iter()
        .filter_map(|(name, key, anchor)| {
            let n = arr(env, key).count();
            (n > 0).then(|| format!("| [{name}]({}) | {n} |", dead_code_docs(anchor)))
        })
        .collect::<Vec<_>>()
        .join("\n")
}

// ---------------------------------------------------------------------------
// summary-check.jq
// ---------------------------------------------------------------------------

struct SectionSpec {
    name: &'static str,
    key: &'static str,
    header: &'static str,
    row: fn(&Value) -> String,
}

fn render_check_section(env: &Value, spec: &SectionSpec) -> String {
    // The job summary is one flat document, so its rows follow the flat path
    // order of the live render. A saved `--group-by` envelope lists its items
    // group by group, and `report --from` flattens them in that order. The sort
    // gives both renders one order. The serialized item breaks ties, so the
    // order is total and does not depend on the input order.
    let items = rows_in_path_order(env, spec.key);
    let n = items.len();
    if n == 0 {
        return String::new();
    }
    let rows = items
        .iter()
        .take(CHECK_SECTION_ROW_LIMIT)
        .map(|item| (spec.row)(item))
        .collect::<Vec<_>>()
        .join("\n");
    let tail = if n > CHECK_SECTION_ROW_LIMIT {
        format!(
            "\n\n> {} more - run `fallow` locally for the full list",
            n - CHECK_SECTION_ROW_LIMIT
        )
    } else {
        String::new()
    };
    format!(
        "\n<details><summary><strong>{} ({n})</strong></summary>\n\n{}{rows}{tail}\n\n</details>\n",
        spec.name, spec.header,
    )
}

/// Rows a check section renders before it prints the count of the rest.
const CHECK_SECTION_ROW_LIMIT: usize = 25;

/// The items of `key` in (path, line, serialized item) order.
///
/// Path and line are read once per item, not once per comparison. The
/// serialized item only breaks a tie on path and line, and only for the tie
/// groups that reach the rendered rows, because serializing is costly and
/// the rows past [`CHECK_SECTION_ROW_LIMIT`] are only counted.
fn rows_in_path_order<'a>(env: &'a Value, key: &str) -> Vec<&'a Value> {
    let mut keyed: Vec<(Option<&str>, Option<u64>, &Value)> = arr(env, key)
        .map(|item| {
            (
                row_sort_path(item),
                item.get("line").and_then(Value::as_u64),
                item,
            )
        })
        .collect();
    keyed.sort_by(|a, b| (a.0, a.1).cmp(&(b.0, b.1)));
    let mut start = 0;
    for run in keyed.chunk_by_mut(|a, b| (a.0, a.1) == (b.0, b.1)) {
        if start >= CHECK_SECTION_ROW_LIMIT {
            break;
        }
        if run.len() > 1 {
            run.sort_by_cached_key(|(_, _, item)| item.to_string());
        }
        start += run.len();
    }
    keyed.into_iter().map(|(_, _, item)| item).collect()
}

/// The path a dead-code row sorts on: `path`, the source file of a boundary
/// violation, or the first file of a cycle. Rows with none (a duplicate export
/// or an unlisted dependency) sort on the serialized item, which starts with
/// the name.
fn row_sort_path(item: &Value) -> Option<&str> {
    item.get("path")
        .or_else(|| item.get("from_path"))
        .or_else(|| item.get("files").and_then(|files| files.get(0)))
        .and_then(Value::as_str)
}

fn check_workspace_context(item: &Value) -> String {
    backtick_join(item, "used_in_workspaces")
}

#[expect(
    clippy::too_many_lines,
    reason = "a flat data table of 14 per-kind row templates ported 1:1 from summary-check.jq; splitting would obscure the correspondence"
)]
fn check_sections_core() -> Vec<SectionSpec> {
    vec![
        SectionSpec {
            name: "Unused files",
            key: "unused_files",
            header: "Files not reachable from any entry point.\n\n| File |\n|------|\n",
            row: |it| format!("| {}{} |", code_cell(it, "path"), caveat_cell_suffix(it)),
        },
        SectionSpec {
            name: "Unused exports",
            key: "unused_exports",
            header: "Exported symbols with no known consumers.\n\n| File | Line | Export |\n|------|-----:|--------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {}{}{} |",
                    code_cell(it, "path"),
                    num(it, "line"),
                    code_cell(it, "export_name"),
                    if b(it, "is_re_export") {
                        " *(re-export)*"
                    } else {
                        ""
                    },
                    caveat_cell_suffix(it),
                )
            },
        },
        SectionSpec {
            name: "Unused types",
            key: "unused_types",
            header: "Type exports with no known consumers.\n\n| File | Line | Type |\n|------|-----:|------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {}{} |",
                    code_cell(it, "path"),
                    num(it, "line"),
                    code_cell(it, "export_name"),
                    caveat_cell_suffix(it),
                )
            },
        },
        SectionSpec {
            name: "Private type leaks",
            key: "private_type_leaks",
            header: "Exported signatures that reference same-file private types.\n\n| File | Line | Export | Private type |\n|------|-----:|--------|--------------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} | {} |",
                    code_cell(it, "path"),
                    num(it, "line"),
                    code_cell(it, "export_name"),
                    code_cell(it, "type_name"),
                )
            },
        },
        SectionSpec {
            name: "Deprecated exports in use",
            key: "deprecated_exports_in_use",
            header: "Exports marked `@deprecated` that still have consumers.\n\n| File | Line | Export | Consumers |\n|------|-----:|--------|----------:|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} | {} |",
                    code_cell(it, "path"),
                    num(it, "line"),
                    code_cell(it, "export_name"),
                    num(it, "consumer_count"),
                )
            },
        },
        SectionSpec {
            name: "Unused dependencies",
            key: "unused_dependencies",
            header: "Listed in `dependencies` but never imported by the declaring workspace.\n\n| Package | Imported elsewhere |\n|---------|--------------------|\n",
            row: |it| {
                format!(
                    "| {}{} | {} |",
                    code_cell(it, "package_name"),
                    caveat_cell_suffix(it),
                    check_workspace_context(it),
                )
            },
        },
        SectionSpec {
            name: "Unused devDependencies",
            key: "unused_dev_dependencies",
            header: "Listed in `devDependencies` but never imported or referenced by the declaring workspace.\n\n| Package | Imported elsewhere |\n|---------|--------------------|\n",
            row: |it| {
                format!(
                    "| {}{} | {} |",
                    code_cell(it, "package_name"),
                    caveat_cell_suffix(it),
                    check_workspace_context(it),
                )
            },
        },
        SectionSpec {
            name: "Unused optionalDependencies",
            key: "unused_optional_dependencies",
            header: "Listed in `optionalDependencies` but never imported by the declaring workspace.\n\n| Package | Imported elsewhere |\n|---------|--------------------|\n",
            row: |it| {
                format!(
                    "| {}{} | {} |",
                    code_cell(it, "package_name"),
                    caveat_cell_suffix(it),
                    check_workspace_context(it),
                )
            },
        },
        SectionSpec {
            name: "Unused enum members",
            key: "unused_enum_members",
            header: "Enum members never referenced outside their declaration.\n\n| File | Line | Enum | Member |\n|------|-----:|------|--------|\n",
            row: member_row,
        },
        SectionSpec {
            name: "Unused class members",
            key: "unused_class_members",
            header: "Class methods or properties never referenced outside their class.\n\n| File | Line | Class | Member |\n|------|-----:|-------|--------|\n",
            row: member_row,
        },
        SectionSpec {
            name: "Unused store members",
            key: "unused_store_members",
            header: "Pinia store members (state, getter, action) never accessed by any consumer.\n\n| File | Line | Store | Member |\n|------|-----:|-------|--------|\n",
            row: member_row,
        },
        SectionSpec {
            name: "Unresolved imports",
            key: "unresolved_imports",
            header: "Import paths that could not be resolved - check for missing packages or broken paths.\n\n| File | Line | Import |\n|------|-----:|--------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} |",
                    code_cell(it, "path"),
                    num(it, "line"),
                    code_cell(it, "specifier"),
                )
            },
        },
        SectionSpec {
            name: "Unlisted dependencies",
            key: "unlisted_dependencies",
            header: "Packages imported in code but missing from `package.json`.\n\n| Package | Used in |\n|---------|--------|\n",
            row: |it| {
                let sites: Vec<&Value> = arr(it, "imported_from").collect();
                let cell = if sites.is_empty() {
                    String::new()
                } else {
                    let shown = sites
                        .iter()
                        .take(3)
                        .map(|site| {
                            markdown_table_code_span(&format!(
                                "{}:{}",
                                s(site, "path"),
                                num(site, "line")
                            ))
                        })
                        .collect::<Vec<_>>()
                        .join(", ");
                    let more = if sites.len() > 3 {
                        format!(" *+{} more*", sites.len() - 3)
                    } else {
                        String::new()
                    };
                    format!("{shown}{more}")
                };
                format!("| {} | {cell} |", code_cell(it, "package_name"))
            },
        },
        SectionSpec {
            name: "Duplicate exports",
            key: "duplicate_exports",
            header: "Same export name defined in multiple files - barrel re-exports may resolve ambiguously.\n\n| Export | Locations |\n|--------|-----------|\n",
            row: |it| {
                let locations: Vec<&Value> = arr(it, "locations").collect();
                let shown = locations
                    .iter()
                    .take(3)
                    .map(|location| {
                        markdown_table_code_span(&format!(
                            "{}:{}",
                            s(location, "path"),
                            num(location, "line")
                        ))
                    })
                    .collect::<Vec<_>>()
                    .join(", ");
                let more = if locations.len() > 3 {
                    format!(" *+{} more*", locations.len() - 3)
                } else {
                    String::new()
                };
                format!("| {} | {shown}{more} |", code_cell(it, "export_name"))
            },
        },
        SectionSpec {
            name: "Circular dependencies",
            key: "circular_dependencies",
            header: "Import cycles that can cause initialization failures and prevent tree-shaking.\n\n| Cycle | Length |\n|-------|-------:|\n",
            row: |it| {
                let cycle = arr(it, "files")
                    .filter_map(Value::as_str)
                    .map(markdown_table_code_span)
                    .collect::<Vec<_>>()
                    .join(" \u{2192} ");
                format!("| {cycle} | {} |", num(it, "length"))
            },
        },
    ]
}

/// Shared by the enum, class, and store member sections. `caveat_cell_suffix`
/// renders nothing for an array the analysis pass does not stamp, so the three
/// sections stay correct without each knowing which set it belongs to, and a
/// future array that starts carrying caveats needs no change here.
fn member_row(it: &Value) -> String {
    format!(
        "| {} | {} | {} | {}{} |",
        code_cell(it, "path"),
        num(it, "line"),
        code_cell(it, "parent_name"),
        code_cell(it, "member_name"),
        caveat_cell_suffix(it),
    )
}

fn plain_join(item: &Value, key: &str, separator: &str) -> String {
    arr(item, key)
        .filter_map(Value::as_str)
        .collect::<Vec<_>>()
        .join(separator)
}

fn path_line_cell(it: &Value) -> String {
    markdown_table_code_span(&format!("{}:{}", s(it, "path"), num(it, "line")))
}

#[expect(
    clippy::too_many_lines,
    reason = "a flat data table of 14 per-kind row templates ported 1:1 from summary-check.jq; splitting would obscure the correspondence"
)]
fn check_sections_architecture() -> Vec<SectionSpec> {
    vec![
        SectionSpec {
            name: "Re-export cycles",
            key: "re_export_cycles",
            header: "Barrel files that re-export from each other in a loop. Chain propagation through the loop is a no-op, so imports through any member may silently come up empty.\n\n| Cycle | Kind | Members |\n|-------|------|--------:|\n",
            row: |it| {
                let cycle = arr(it, "files")
                    .filter_map(Value::as_str)
                    .map(markdown_table_code_span)
                    .collect::<Vec<_>>()
                    .join(" <-> ");
                format!(
                    "| {cycle} | {} | {} |",
                    markdown_table_text(s(it, "kind")),
                    arr(it, "files").count()
                )
            },
        },
        SectionSpec {
            name: "Package cycles",
            key: "package_cycles",
            header: "Workspace packages that import each other in a loop. Packages in a cycle cannot be built in dependency order.\n\n| Cycle | Example import | Packages |\n|-------|----------------|---------:|\n",
            row: |it| {
                let mut chain: Vec<String> = arr(it, "packages")
                    .filter_map(Value::as_str)
                    .map(markdown_table_code_span)
                    .collect();
                if let Some(first) = chain.first().cloned() {
                    chain.push(first);
                }
                let example = arr(it, "edges")
                    .next()
                    .map_or_else(String::new, path_line_cell);
                let note = if it.get("group_truncated").and_then(Value::as_bool) == Some(true) {
                    format!(
                        " ({})",
                        fallow_types::results::PackageCycle::GROUP_TRUNCATED_NOTE
                    )
                } else {
                    String::new()
                };
                format!(
                    "| {}{note} | {example} | {} |",
                    chain.join(" \u{2192} "),
                    arr(it, "packages").count()
                )
            },
        },
        SectionSpec {
            name: "Boundary violations",
            key: "boundary_violations",
            header: "Imports that cross defined architecture zone boundaries.\n\n| From | To | Zones |\n|------|-----|-------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} \u{2192} {} |",
                    markdown_table_code_span(&format!(
                        "{}:{}",
                        s(it, "from_path"),
                        num(it, "line")
                    )),
                    code_cell(it, "to_path"),
                    markdown_table_code_span(s(it, "from_zone")),
                    markdown_table_code_span(s(it, "to_zone")),
                )
            },
        },
        SectionSpec {
            name: "Boundary coverage",
            key: "boundary_coverage_violations",
            header: "Files that match no configured architecture boundary zone.\n\n| File |\n|------|\n",
            row: |it| format!("| {} |", path_line_cell(it)),
        },
        SectionSpec {
            name: "Boundary calls",
            key: "boundary_call_violations",
            header: "Calls from zoned files to callees forbidden for that zone.\n\n| File | Callee | Zone | Pattern |\n|------|--------|------|---------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} | {} |",
                    path_line_cell(it),
                    code_cell(it, "callee"),
                    markdown_table_code_span(s(it, "zone")),
                    code_cell(it, "pattern"),
                )
            },
        },
        SectionSpec {
            name: "Policy violations",
            key: "policy_violations",
            header: "Banned calls, imports, and catalogue-derived effects matched by configured rule packs.\n\n| File | Matched | Rule | Severity |\n|------|---------|------|----------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} | {} |",
                    path_line_cell(it),
                    code_cell(it, "matched"),
                    markdown_table_code_span(&format!("{}/{}", s(it, "pack"), s(it, "rule_id"))),
                    markdown_table_text(s(it, "severity")),
                )
            },
        },
        SectionSpec {
            name: "Invalid client exports",
            key: "invalid_client_exports",
            header: "`\"use client\"` files exporting a Next.js server-only / route-config name. Next.js rejects this at build time.\n\n| File | Export | Directive |\n|------|--------|-----------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} |",
                    path_line_cell(it),
                    code_cell(it, "export_name"),
                    markdown_table_code_span(&format!("\"{}\"", s(it, "directive"))),
                )
            },
        },
        SectionSpec {
            name: "Mixed client/server barrels",
            key: "mixed_client_server_barrels",
            header: "Barrels re-exporting both a `\"use client\"` module and a server-only module. One import drags the other's directive across the boundary.\n\n| File | Client origin | Server origin |\n|------|---------------|---------------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} |",
                    path_line_cell(it),
                    code_cell(it, "client_origin"),
                    code_cell(it, "server_origin"),
                )
            },
        },
        SectionSpec {
            name: "Misplaced directives",
            key: "misplaced_directives",
            header: "`\"use client\"` / `\"use server\"` directives written after a non-directive statement, so the RSC bundler ignores them. Move the directive to the top of the file.\n\n| File | Directive |\n|------|-----------|\n",
            row: |it| {
                format!(
                    "| {} | {} |",
                    path_line_cell(it),
                    markdown_table_code_span(&format!("\"{}\"", s(it, "directive"))),
                )
            },
        },
        SectionSpec {
            name: "Unused server actions",
            key: "unused_server_actions",
            header: "Next.js Server Actions (exports of a `\"use server\"` file) that no project code references. The endpoint stays POST-able, but no code calls it (likely dead).\n\n| File | Action |\n|------|--------|\n",
            row: |it| {
                format!(
                    "| {} | {} |",
                    path_line_cell(it),
                    code_cell(it, "action_name")
                )
            },
        },
        SectionSpec {
            name: "Route collisions",
            key: "route_collisions",
            header: "Next.js App Router route files that resolve to the same URL within one app-root. Next.js fails the build because a URL can have only one owner.\n\n| File | URL |\n|------|-----|\n",
            row: |it| format!("| {} | {} |", code_cell(it, "path"), code_cell(it, "url")),
        },
        SectionSpec {
            name: "Dynamic segment conflicts",
            key: "dynamic_segment_name_conflicts",
            header: "Sibling Next.js dynamic route segments at one position using different slug names. Next.js requires one consistent name per dynamic path.\n\n| File | Position | Segments |\n|------|----------|----------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} |",
                    code_cell(it, "path"),
                    code_cell(it, "position"),
                    markdown_table_code_span(&plain_join(it, "conflicting_segments", ", ")),
                )
            },
        },
    ]
}

#[expect(
    clippy::too_many_lines,
    reason = "a flat data table of 14 per-kind row templates ported 1:1 from summary-check.jq; splitting would obscure the correspondence"
)]
fn check_sections_frameworks_and_hygiene() -> Vec<SectionSpec> {
    vec![
        SectionSpec {
            name: "Unrendered components",
            key: "unrendered_components",
            header: "Vue/Svelte components reachable in the module graph but rendered nowhere: no tag, no dynamic binding, no registration. A barrel re-export keeps them alive even though nothing instantiates them.\n\n| File | Component | Framework |\n|------|-----------|-----------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} |",
                    path_line_cell(it),
                    code_cell(it, "component_name"),
                    markdown_table_text(s(it, "framework")),
                )
            },
        },
        SectionSpec {
            name: "Unused component props",
            key: "unused_component_props",
            header: "Vue `defineProps` props referenced nowhere inside their own single-file component (neither script nor template).\n\n| File | Component | Prop |\n|------|-----------|------|\n",
            row: |it| component_detail_row(it, "prop_name"),
        },
        SectionSpec {
            name: "Unused component emits",
            key: "unused_component_emits",
            header: "Vue `defineEmits` events emitted nowhere inside their own single-file component (no matching `emit()` call).\n\n| File | Component | Event |\n|------|-----------|-------|\n",
            row: |it| component_detail_row(it, "emit_name"),
        },
        SectionSpec {
            name: "Unused component inputs",
            key: "unused_component_inputs",
            header: "Angular `@Input()` / signal `input()` declarations read nowhere inside their own component (neither class body nor template).\n\n| File | Component | Input |\n|------|-----------|-------|\n",
            row: |it| component_detail_row(it, "input_name"),
        },
        SectionSpec {
            name: "Unused component outputs",
            key: "unused_component_outputs",
            header: "Angular `@Output()` / signal `output()` declarations emitted nowhere inside their own component (no matching `emit()` call).\n\n| File | Component | Output |\n|------|-----------|--------|\n",
            row: |it| component_detail_row(it, "output_name"),
        },
        SectionSpec {
            name: "Unused Svelte events",
            key: "unused_svelte_events",
            header: "Svelte components dispatching a `createEventDispatcher` event listened to nowhere in the project (cross-file dead-output direction).\n\n| File | Component | Event |\n|------|-----------|-------|\n",
            row: |it| component_detail_row(it, "event_name"),
        },
        SectionSpec {
            name: "Unprovided injects",
            key: "unprovided_injects",
            header: "Vue `inject` / Svelte `getContext` calls for a key that no ancestor `provide` / `setContext` supplies.\n\n| File | Key | Framework |\n|------|-----|-----------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} |",
                    path_line_cell(it),
                    code_cell(it, "key_name"),
                    markdown_table_text(s(it, "framework")),
                )
            },
        },
        SectionSpec {
            name: "Unused load data keys",
            key: "unused_load_data_keys",
            header: "SvelteKit `load()` return-object keys read by no consumer (neither the sibling `+page.svelte` nor `$page.data`). The key runs a real server fetch / DB cost per request for data nothing renders.\n\n| File | Route | Key |\n|------|-------|-----|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} |",
                    path_line_cell(it),
                    code_cell(it, "route_dir"),
                    code_cell(it, "key_name"),
                )
            },
        },
        SectionSpec {
            name: "Type-only dependencies",
            key: "type_only_dependencies",
            header: "Dependencies only used for type imports - consider moving to `devDependencies`.\n\n| Package |\n|---------|\n",
            row: package_row,
        },
        SectionSpec {
            name: "Test-only dependencies",
            key: "test_only_dependencies",
            header: "Production dependencies only imported by test files - consider moving to `devDependencies`.\n\n| Package |\n|---------|\n",
            row: package_row,
        },
        SectionSpec {
            name: "Dev dependencies used in production",
            key: "dev_dependencies_in_production",
            header: "`devDependencies` imported by production code at runtime - consider moving to `dependencies` so a production-only install does not break.\n\n| Package |\n|---------|\n",
            row: package_row,
        },
        SectionSpec {
            name: "Stale suppressions",
            key: "stale_suppressions",
            header: "Suppression comments or JSDoc tags that no longer match any active issue.\n\n| File | Line | Description |\n|------|-----:|-------------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} |",
                    code_cell(it, "path"),
                    num(it, "line"),
                    stale_suppression_description(it),
                )
            },
        },
    ]
}

fn component_detail_row(it: &Value, detail_key: &str) -> String {
    format!(
        "| {} | {} | {} |",
        path_line_cell(it),
        code_cell(it, "component_name"),
        code_cell(it, detail_key),
    )
}

fn package_row(it: &Value) -> String {
    format!("| {} |", code_cell(it, "package_name"))
}

fn stale_suppression_description(it: &Value) -> String {
    let origin = it.get("origin").cloned().unwrap_or(Value::Null);
    if s(&origin, "type") == "jsdoc_tag" {
        return format!(
            "`@expected-unused` on {}",
            code_cell(&origin, "export_name")
        );
    }
    if origin.get("kind_known").and_then(Value::as_bool) == Some(false) {
        return format!("unknown kind {}", code_cell(&origin, "issue_kind"));
    }
    match origin.get("issue_kind").and_then(Value::as_str) {
        Some(kind) => markdown_table_code_span(kind),
        None => "blanket".to_owned(),
    }
}

fn check_sections_catalog() -> Vec<SectionSpec> {
    vec![
        SectionSpec {
            name: "Unused catalog entries",
            key: "unused_catalog_entries",
            header: "pnpm catalog entries not referenced by any workspace package.\n\n| Entry | Catalog | Location | Hardcoded consumers |\n|-------|---------|----------|---------------------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} | {} |",
                    code_cell(it, "entry_name"),
                    code_cell(it, "catalog_name"),
                    path_line_cell(it),
                    backtick_join(it, "hardcoded_consumers"),
                )
            },
        },
        SectionSpec {
            name: "Empty catalog groups",
            key: "empty_catalog_groups",
            header: "Named pnpm catalog groups with no entries.\n\n| Catalog | Location |\n|---------|----------|\n",
            row: |it| {
                format!(
                    "| {} | {} |",
                    code_cell(it, "catalog_name"),
                    path_line_cell(it)
                )
            },
        },
        SectionSpec {
            name: "Unresolved catalog references",
            key: "unresolved_catalog_references",
            header: "Workspace `package.json` references to catalogs that do not declare the package. `pnpm install` will fail until each entry is added to its named catalog or the reference is switched.\n\n| Entry | Catalog | Location | Available in |\n|-------|---------|----------|--------------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} | {} |",
                    code_cell(it, "entry_name"),
                    code_cell(it, "catalog_name"),
                    path_line_cell(it),
                    backtick_join(it, "available_in_catalogs"),
                )
            },
        },
        SectionSpec {
            name: "Unused dependency overrides",
            key: "unused_dependency_overrides",
            header: "Package-manager override entries forcing a version no workspace package depends on. Some entries may be intentional pins for transitive CVEs; the hint column flags those.\n\n| Override | Forces | Source | Location | Hint |\n|----------|--------|--------|----------|------|\n",
            row: |it| {
                format!(
                    "| {} | {} -> {} | {} | {} | {} |",
                    code_cell(it, "raw_key"),
                    code_cell(it, "target_package"),
                    code_cell(it, "version_range"),
                    code_cell(it, "source"),
                    path_line_cell(it),
                    markdown_table_text(str_or(it, "hint", "")),
                )
            },
        },
        SectionSpec {
            name: "Misconfigured dependency overrides",
            key: "misconfigured_dependency_overrides",
            header: "Package-manager override entries with an unparsable key or empty value. The active package manager will reject or ignore these.\n\n| Override | Value | Source | Location | Reason |\n|----------|-------|--------|----------|--------|\n",
            row: |it| {
                format!(
                    "| {} | {} | {} | {} | {} |",
                    markdown_table_code_span(str_or(it, "raw_key", "")),
                    markdown_table_code_span(str_or(it, "raw_value", "")),
                    code_cell(it, "source"),
                    path_line_cell(it),
                    markdown_table_text(str_or(it, "reason", "unparsable")),
                )
            },
        },
    ]
}

fn check_tips(env: &Value) -> String {
    let fixable = arr(env, "unused_exports").count()
        + arr(env, "unused_dependencies").count()
        + arr(env, "unused_enum_members").count();
    let mut tips = String::from("\n\n> [!TIP]\n");
    if fixable > 0 {
        tips.push_str("> Run `fallow fix --dry-run` to preview safe auto-fixes.\n");
    }
    if arr(env, "unused_exports").count() > 0 {
        let _ = writeln!(
            tips,
            "> Intentionally public? Add [`/** @public */`]({SUPPRESSION_DOCS}) above exports to preserve them."
        );
    }
    let _ = write!(
        tips,
        "> Add [`// fallow-ignore-next-line`]({SUPPRESSION_DOCS}) above a line to suppress a specific finding."
    );
    tips
}

/// Port of `summary-check.jq`.
#[must_use]
fn render_check_summary(env: &Value) -> String {
    let elapsed = num(env, "elapsed_ms");
    let total_issues = u(env, "total_issues");
    if total_issues == 0 {
        return format!(
            "# Fallow Analysis\n\n> [!NOTE]\n> **No issues found** \u{b7} {elapsed}ms\n\nAll exports are used, all dependencies are declared, and no issues were detected."
        );
    }
    let mut sections = String::new();
    for group in [
        check_sections_core(),
        check_sections_architecture(),
        check_sections_frameworks_and_hygiene(),
        check_sections_catalog(),
    ] {
        for spec in &group {
            sections.push_str(&render_check_section(env, spec));
        }
    }
    let issue_noun = if total_issues == 1 { "issue" } else { "issues" };
    format!(
        "# Fallow Analysis\n\n> [!WARNING]\n> **{total_issues} {issue_noun}** found \u{b7} {elapsed}ms\n\n| Category | Count |\n|----------|------:|\n{}\n\n---\n{sections}{}",
        dead_code_category_table(env),
        check_tips(env),
    )
}

// ---------------------------------------------------------------------------
// summary-dupes.jq
// ---------------------------------------------------------------------------

fn dupes_family_entry(family: &Value) -> String {
    let files: Vec<String> = arr(family, "files")
        .filter_map(Value::as_str)
        .map(markdown_code_span)
        .collect();
    let shown = files[..files.len().min(3)].join(", ");
    let more = if files.len() > 3 {
        format!(" (+{} more)", files.len() - 3)
    } else {
        String::new()
    };
    let mut entry = format!(
        "- **{shown}{more}** - {} lines, {} groups",
        num(family, "total_duplicated_lines"),
        arr(family, "groups").count(),
    );
    if let Some(best_group) = best_clone_group(family)
        && arr(best_group, "instances").next().is_some()
    {
        let locations = arr(best_group, "instances")
            .map(instance_location)
            .collect::<Vec<_>>()
            .join(", ");
        let _ = write!(entry, "\n  - {locations}");
    }
    if arr(family, "suggestions").next().is_some() {
        let suggestions = arr(family, "suggestions")
            .map(|suggestion| {
                format!(
                    "  - {} (~{} lines)",
                    markdown_table_text(s(suggestion, "description")),
                    num(suggestion, "estimated_savings"),
                )
            })
            .collect::<Vec<_>>()
            .join("\n");
        let _ = write!(entry, "\n{suggestions}");
    }
    entry
}

fn instance_location(instance: &Value) -> String {
    markdown_code_span(&format!(
        "{}:{}-{}",
        s(instance, "file"),
        num(instance, "start_line"),
        num(instance, "end_line"),
    ))
}

type CloneGroupJsonRankKey = (
    std::cmp::Reverse<u128>,
    std::cmp::Reverse<u64>,
    std::cmp::Reverse<u64>,
    std::cmp::Reverse<usize>,
    std::cmp::Reverse<u64>,
    String,
    u64,
);

fn clone_group_rank_key(group: &Value) -> CloneGroupJsonRankKey {
    const WEIGHTS: [u64; 9] = [
        1_000_000_000,
        1_047_319_732,
        1_075_000_000,
        1_094_639_463,
        1_109_873_014,
        1_122_319_732,
        1_132_843_281,
        1_141_959_195,
        1_150_000_000,
    ];
    let spread = u(group, "spread");
    let token_count = u(group, "token_count");
    let instances: Vec<&Value> = arr(group, "instances").collect();
    let first = instances
        .iter()
        .min_by_key(|instance| (s(instance, "file").to_string(), u(instance, "start_line")));
    let weight = WEIGHTS[usize::try_from(spread.min(8)).unwrap_or(8)];
    let score = u128::from(token_count)
        .saturating_mul(u128::try_from(instances.len()).unwrap_or(u128::MAX))
        .saturating_mul(u128::from(weight));
    (
        std::cmp::Reverse(score),
        std::cmp::Reverse(spread),
        std::cmp::Reverse(token_count),
        std::cmp::Reverse(instances.len()),
        std::cmp::Reverse(u(group, "line_count")),
        first.map_or_else(String::new, |instance| s(instance, "file").to_string()),
        first.map_or(0, |instance| u(instance, "start_line")),
    )
}

/// Reapply the engine's canonical clone ranking from public JSON fields.
fn sorted_clone_groups(env: &Value) -> Vec<&Value> {
    let mut groups: Vec<&Value> = arr(env, "clone_groups").collect();
    groups.sort_by_cached_key(|group| clone_group_rank_key(group));
    groups
}

fn best_clone_group(family: &Value) -> Option<&Value> {
    arr(family, "groups").min_by_key(|group| clone_group_rank_key(group))
}

type CloneFamilyJsonRankKey = (bool, Option<CloneGroupJsonRankKey>, Vec<String>);

fn clone_family_rank_key(family: &Value) -> CloneFamilyJsonRankKey {
    let best_group = best_clone_group(family).map(clone_group_rank_key);
    let files = arr(family, "files")
        .filter_map(Value::as_str)
        .map(str::to_owned)
        .collect();
    (best_group.is_none(), best_group, files)
}

fn sorted_clone_families(env: &Value) -> Vec<&Value> {
    let mut families: Vec<&Value> = arr(env, "clone_families").collect();
    families.sort_by_cached_key(|family| clone_family_rank_key(family));
    families
}

/// What the measured corpus holds, which is what the headline beside this block
/// counts: the entries that reached the envelope plus the ones a presentation
/// cap such as `--top` withheld before it got here.
///
/// `clone_groups_omitted` / `clone_families_omitted` are `0` on an untruncated
/// run, so this is the plain array length in the common case.
fn dupes_corpus_total(env: &Value, listed: usize, omitted_key: &str) -> usize {
    listed.saturating_add(u(env, omitted_key) as usize)
}

/// Name what this listing does not show, so the corpus total in the headline is
/// never read as the size of the list below it.
///
/// `withheld` is measured against the corpus, not against the envelope array:
/// two caps stack here, `--top` before the envelope was built and this block's
/// own display limit after, and a reader who acts on the listing needs the
/// total of both. Empty when the listing is complete, which keeps an
/// untruncated run's summary byte-identical.
fn dupes_omission_tail(withheld: usize, capped_by_top: usize, noun: &str) -> String {
    if withheld == 0 {
        return String::new();
    }
    if capped_by_top == 0 {
        return format!("\n- *... and {withheld} more {noun}*");
    }
    format!(
        "\n- *... and {withheld} more {noun}, {capped_by_top} of them withheld by a display limit before this report*"
    )
}

fn dupes_details(env: &Value) -> String {
    let families = sorted_clone_families(env);
    if families.is_empty() {
        let groups = sorted_clone_groups(env);
        let rows = groups
            .iter()
            .take(20)
            .map(|group| {
                let locations = arr(group, "instances")
                    .map(instance_location)
                    .collect::<Vec<_>>()
                    .join(", ");
                format!(
                    "- **{} lines, {} tokens**, {locations}",
                    num(group, "line_count"),
                    num(group, "token_count"),
                )
            })
            .collect::<Vec<_>>()
            .join("\n");
        // Subtract what this listing actually rendered, not the display limit:
        // a `--top` below the limit leaves fewer rows than 20, and measuring
        // the withholding against the limit would under-report it.
        let total = dupes_corpus_total(env, groups.len(), "clone_groups_omitted");
        let tail = dupes_omission_tail(
            total.saturating_sub(groups.len().min(20)),
            u(env, "clone_groups_omitted") as usize,
            "groups",
        );
        format!("{rows}{tail}")
    } else {
        let entries = families
            .iter()
            .take(15)
            .map(|family| dupes_family_entry(family))
            .collect::<Vec<_>>()
            .join("\n");
        let total = dupes_corpus_total(env, families.len(), "clone_families_omitted");
        let tail = dupes_omission_tail(
            total.saturating_sub(families.len().min(15)),
            u(env, "clone_families_omitted") as usize,
            "families",
        );
        format!("**Clone Families ({total})**\n\n{entries}{tail}")
    }
}

/// Port of `summary-dupes.jq`.
#[must_use]
fn render_dupes_summary(env: &Value) -> String {
    let stats = env.get("stats").cloned().unwrap_or(Value::Null);
    let elapsed = num(env, "elapsed_ms");
    if u(&stats, "clone_groups") == 0 {
        return format!(
            "## Fallow - Code Duplication\n\nNo code duplication found.\n\n*Analyzed {} files in {elapsed}ms*",
            num(&stats, "total_files"),
        );
    }
    format!(
        "## Fallow - Code Duplication\n\nFound **{} clone groups** ({} instances) across {} files in {elapsed}ms\n\n| Metric | Value |\n|--------|-------|\n| Files analyzed | {} |\n| Files with clones | {} |\n| Clone groups | {} |\n| Clone instances | {} |\n| Duplicated lines | {} / {} ({}%) |\n\n<details>\n<summary>View details</summary>\n\n{}\n\n</details>",
        num(&stats, "clone_groups"),
        num(&stats, "clone_instances"),
        num(&stats, "files_with_clones"),
        num(&stats, "total_files"),
        num(&stats, "files_with_clones"),
        num(&stats, "clone_groups"),
        num(&stats, "clone_instances"),
        num(&stats, "duplicated_lines"),
        num(&stats, "total_lines"),
        pct(f_or_zero(&stats, "duplication_percentage")),
        dupes_details(env),
    )
}

// ---------------------------------------------------------------------------
// summary-health.jq
// ---------------------------------------------------------------------------

fn metric_delta<'v>(score_env: &'v Value, name: &str) -> Option<&'v Value> {
    score_env
        .get("health_trend")
        .and_then(|trend| trend.get("metrics"))
        .and_then(Value::as_array)
        .and_then(|metrics| metrics.iter().find(|metric| s(metric, "name") == name))
}

/// The `> **Health: ...**` trend header shared by `summary-health.jq` and
/// `summary-combined.jq`. Empty when no `health_score` block is present.
fn health_score_header(score_env: &Value) -> String {
    let Some(score) = score_env
        .get("health_score")
        .filter(|value| !value.is_null())
    else {
        return String::new();
    };
    let mut header = format!(
        "> **Health: {} ({})**",
        s(score, "grade"),
        pct(f_or_zero(score, "score")),
    );
    if let Some(score_delta) = metric_delta(score_env, "score") {
        let compared = score_env
            .get("health_trend")
            .and_then(|trend| trend.get("compared_to"))
            .cloned()
            .unwrap_or(Value::Null);
        let _ = write!(
            header,
            " \u{b7} {} pts vs previous ({} {})",
            signed(f_or_zero(score_delta, "delta")),
            s(&compared, "grade"),
            pct(f_or_zero(&compared, "score")),
        );
        if let Some(dead_delta) = metric_delta(score_env, "dead_export_pct")
            && f_or_zero(dead_delta, "delta") != 0.0
        {
            let _ = write!(
                header,
                " \u{b7} {} {}% ({}%)",
                s(dead_delta, "label").to_ascii_lowercase(),
                pct(f_or_zero(dead_delta, "current")),
                signed(f_or_zero(dead_delta, "delta")),
            );
            if f_or_zero(dead_delta, "delta") > 0.0 {
                let _ = write!(header, " [suppress?]({SUPPRESSION_DOCS})");
            }
        }
        if let Some(cx_delta) = metric_delta(score_env, "avg_cyclomatic")
            && f_or_zero(cx_delta, "delta") != 0.0
        {
            let _ = write!(
                header,
                " \u{b7} {} {} ({})",
                s(cx_delta, "label").to_ascii_lowercase(),
                pct(f_or_zero(cx_delta, "current")),
                signed(f_or_zero(cx_delta, "delta")),
            );
        }
    } else {
        header.push_str("\n> _Enable `save-snapshot: true` to track score trends over time._");
    }
    header.push_str("\n\n");
    header
}

fn exceeded_marker(it: &Value, needles: &[&str]) -> &'static str {
    let exceeded = s(it, "exceeded");
    if needles.iter().any(|needle| exceeded.contains(needle)) {
        " **!**"
    } else {
        ""
    }
}

fn crap_cell(it: &Value) -> String {
    match it.get("crap").filter(|crap| !crap.is_null()) {
        None => "-".to_owned(),
        Some(crap) => format!("{}{}", fmt_num(crap), exceeded_marker(it, &["crap", "all"])),
    }
}

fn complexity_table_row(it: &Value) -> String {
    format!(
        "| {} | {} | {} | {}{} | {}{} | {} | {} |",
        path_line_cell(it),
        code_cell(it, "name"),
        markdown_table_text(str_or(it, "severity", "moderate")),
        num(it, "cyclomatic"),
        exceeded_marker(it, &["cyclomatic", "both", "all"]),
        num(it, "cognitive"),
        exceeded_marker(it, &["cognitive", "both", "all"]),
        crap_cell(it),
        num(it, "line_count"),
    )
}

const COMPLEXITY_TABLE_HEADER: &str = "| File | Function | Severity | Cyclomatic | Cognitive | CRAP | Lines |\n|:-----|:---------|:---------|:-----------|:----------|:-----|:------|\n";

fn health_thresholds_footer(env: &Value) -> String {
    let summary = env.get("summary").cloned().unwrap_or(Value::Null);
    format!(
        "\n\n**!** marks the dimension that breached.\n\n**{}** files, **{}** functions analyzed (thresholds: cyclomatic > {}, cognitive > {}, CRAP >= {})",
        num(&summary, "files_analyzed"),
        num(&summary, "functions_analyzed"),
        num(&summary, "max_cyclomatic_threshold"),
        num(&summary, "max_cognitive_threshold"),
        threshold_or(&summary, "max_crap_threshold", "30"),
    )
}

fn threshold_or(summary: &Value, key: &str, default: &str) -> String {
    summary
        .get(key)
        .filter(|value| !value.is_null())
        .map_or_else(|| default.to_owned(), fmt_num)
}

fn complexity_rows(findings: &[&Value], cap: usize) -> String {
    findings
        .iter()
        .take(cap)
        .map(|finding| complexity_table_row(finding))
        .collect::<Vec<_>>()
        .join("\n")
}

fn runtime_finding_row(it: &Value) -> String {
    let invocations = it
        .get("invocations")
        .filter(|value| !value.is_null())
        .map_or_else(|| "-".to_owned(), fmt_num);
    format!(
        "| {} | {} | {} | {invocations} | {} |",
        path_line_cell(it),
        code_cell(it, "function"),
        code_cell(it, "verdict"),
        markdown_table_text(s(it, "confidence")),
    )
}

fn render_health_complexity_only(env: &Value, complex: usize, elapsed: &str) -> String {
    let summary = env.get("summary").cloned().unwrap_or(Value::Null);
    if complex == 0 {
        return format!(
            "## Fallow - Code Complexity\n\n> [!NOTE]\n> **No functions exceed complexity thresholds** \u{b7} {elapsed}ms\n\n{} functions analyzed (max cyclomatic: {}, max cognitive: {}, max CRAP: {})",
            num(&summary, "functions_analyzed"),
            num(&summary, "max_cyclomatic_threshold"),
            num(&summary, "max_cognitive_threshold"),
            threshold_or(&summary, "max_crap_threshold", "30"),
        );
    }
    let above = u(&summary, "functions_above_threshold");
    let findings: Vec<&Value> = arr(env, "findings").collect();
    let tail = if complex > 25 {
        format!(
            "\n\n> {} more - run `fallow health` locally for the full list",
            complex - 25
        )
    } else {
        String::new()
    };
    format!(
        "## Fallow - Code Complexity\n\n> [!WARNING]\n> **{above} function{} exceed{} thresholds** \u{b7} {elapsed}ms\n\n{COMPLEXITY_TABLE_HEADER}{}{tail}{}",
        if above == 1 { "" } else { "s" },
        if above == 1 { "s" } else { "" },
        complexity_rows(&findings, 25),
        health_thresholds_footer(env),
    )
}

fn prod_phrase(complex: usize, prod: usize) -> String {
    let complexity = format!(
        "{complex} complexity finding{}",
        if complex == 1 { "" } else { "s" }
    );
    let runtime = format!(
        "{prod} runtime coverage finding{}",
        if prod == 1 { "" } else { "s" }
    );
    if complex > 0 && prod > 0 {
        format!("{complexity} and {runtime}")
    } else if complex > 0 {
        complexity
    } else {
        runtime
    }
}

fn render_health_with_runtime(env: &Value, complex: usize, elapsed: &str) -> String {
    let runtime = env.get("runtime_coverage").cloned().unwrap_or(Value::Null);
    let prod_findings: Vec<&Value> = arr(&runtime, "findings").collect();
    let hot_paths: Vec<&Value> = arr(&runtime, "hot_paths").collect();
    let prod = prod_findings.len();
    let hot = hot_paths.len();
    let mut out = String::from("## Fallow - Health\n\n");
    if complex == 0 && prod == 0 {
        let _ = write!(
            out,
            "> [!NOTE]\n> **No failing health findings** \u{b7} {elapsed}ms\n\n"
        );
    } else {
        let _ = write!(
            out,
            "> [!WARNING]\n> **{}** \u{b7} {elapsed}ms\n\n",
            prod_phrase(complex, prod),
        );
    }
    if complex > 0 {
        let findings: Vec<&Value> = arr(env, "findings").collect();
        let _ = write!(
            out,
            "### Complexity\n\n{COMPLEXITY_TABLE_HEADER}{}",
            complexity_rows(&findings, 25),
        );
        if complex > 25 {
            let _ = write!(
                out,
                "\n\n> {} more complexity findings - run `fallow health` locally for the full list",
                complex - 25,
            );
        }
    }
    if prod > 0 {
        if complex > 0 {
            out.push_str("\n\n");
        }
        out.push_str("### Runtime Coverage\n\n| File | Function | Verdict | Invocations | Confidence |\n|:-----|:---------|:--------|------------:|:-----------|\n");
        out.push_str(
            &prod_findings
                .iter()
                .take(25)
                .map(|finding| runtime_finding_row(finding))
                .collect::<Vec<_>>()
                .join("\n"),
        );
        if prod > 25 {
            let _ = write!(
                out,
                "\n\n> {} more runtime coverage findings - run `fallow health` locally for the full list",
                prod - 25,
            );
        }
    }
    if hot > 0 {
        if complex > 0 || prod > 0 {
            out.push_str("\n\n");
        }
        out.push_str("### Hot Paths\n\n| File | Function | Invocations | Percentile |\n|:-----|:---------|------------:|-----------:|\n");
        out.push_str(
            &hot_paths
                .iter()
                .take(10)
                .map(|path| {
                    format!(
                        "| {} | {} | {} | {} |",
                        path_line_cell(path),
                        code_cell(path, "function"),
                        num(path, "invocations"),
                        num(path, "percentile"),
                    )
                })
                .collect::<Vec<_>>()
                .join("\n"),
        );
        if hot > 10 {
            let _ = write!(out, "\n\n> {} more hot paths in the full report", hot - 10);
        }
    }
    out.push_str(&health_runtime_footer(env, complex, prod, hot, &runtime));
    out
}

fn health_runtime_footer(
    env: &Value,
    complex: usize,
    prod: usize,
    hot: usize,
    runtime: &Value,
) -> String {
    if complex > 0 {
        return health_thresholds_footer(env);
    }
    if prod > 0 {
        let summary = runtime.get("summary").cloned().unwrap_or(Value::Null);
        return format!(
            "\n\n**{}** tracked functions, **{}** hit, **{}** unhit, **{}** untracked",
            num(&summary, "functions_tracked"),
            num(&summary, "functions_hit"),
            num(&summary, "functions_unhit"),
            num(&summary, "functions_untracked"),
        );
    }
    format!(
        "\n\nObserved **{hot}** hot path{} in runtime coverage.",
        if hot == 1 { "" } else { "s" },
    )
}

/// Port of `summary-health.jq`.
#[must_use]
fn render_health_summary(env: &Value) -> String {
    let elapsed = num(env, "elapsed_ms");
    let complex = arr(env, "findings").count();
    let runtime = env.get("runtime_coverage").cloned().unwrap_or(Value::Null);
    let prod = arr(&runtime, "findings").count();
    let hot = arr(&runtime, "hot_paths").count();
    let body = if prod == 0 && hot == 0 {
        render_health_complexity_only(env, complex, &elapsed)
    } else {
        render_health_with_runtime(env, complex, &elapsed)
    };
    format!("{}{body}", health_score_header(env))
}

// ---------------------------------------------------------------------------
// summary-audit.jq
// ---------------------------------------------------------------------------

const fn audit_verdict_label(verdict: &str) -> &'static str {
    match verdict.as_bytes() {
        b"fail" => "[!WARNING]\n> **Audit failed**",
        b"warn" => "[!WARNING]\n> **Audit passed with warnings**",
        _ => "[!NOTE]\n> **Audit passed**",
    }
}

fn introduced_label(item: &Value) -> &'static str {
    match item.get("introduced").and_then(Value::as_bool) {
        Some(true) => "new",
        Some(false) => "inherited",
        None => "-",
    }
}

struct AuditRow {
    kind: &'static str,
    location: String,
    item: String,
    status: &'static str,
}

fn audit_row(kind: &'static str, location: String, item: String, finding: &Value) -> AuditRow {
    AuditRow {
        kind,
        location,
        item,
        status: introduced_label(finding),
    }
}

type AuditRowSpec = (&'static str, &'static str, fn(&Value) -> String);

/// jq order positions 2-11: exports, types, leaks, dependencies, members,
/// unresolved imports.
const AUDIT_EXPORT_DEP_ROWS: &[AuditRowSpec] = &[
    ("Unused export", "unused_exports", |it| {
        code_cell(it, "export_name")
    }),
    ("Unused type", "unused_types", |it| {
        code_cell(it, "export_name")
    }),
    ("Private type leak", "private_type_leaks", |it| {
        format!(
            "{} -> {}",
            code_cell(it, "export_name"),
            code_cell(it, "type_name")
        )
    }),
    (
        "Deprecated export in use",
        "deprecated_exports_in_use",
        |it| code_cell(it, "export_name"),
    ),
    ("Unused dependency", "unused_dependencies", |it| {
        code_cell(it, "package_name")
    }),
    ("Unused devDependency", "unused_dev_dependencies", |it| {
        code_cell(it, "package_name")
    }),
    (
        "Unused optionalDependency",
        "unused_optional_dependencies",
        |it| code_cell(it, "package_name"),
    ),
    ("Unused enum member", "unused_enum_members", member_item),
    ("Unused class member", "unused_class_members", member_item),
    ("Unused store member", "unused_store_members", member_item),
    ("Unresolved import", "unresolved_imports", |it| {
        code_cell(it, "specifier")
    }),
];

/// jq order positions 26-33: component-model kinds.
const AUDIT_COMPONENT_ROWS: &[AuditRowSpec] = &[
    ("Unrendered component", "unrendered_components", |it| {
        format!(
            "{} ({})",
            code_cell(it, "component_name"),
            markdown_table_text(s(it, "framework"))
        )
    }),
    ("Unused component prop", "unused_component_props", |it| {
        component_member_item(it, "prop_name")
    }),
    ("Unused component emit", "unused_component_emits", |it| {
        format!(
            "{} emit {}",
            code_cell(it, "component_name"),
            code_cell(it, "emit_name")
        )
    }),
    ("Unused component input", "unused_component_inputs", |it| {
        component_member_item(it, "input_name")
    }),
    (
        "Unused component output",
        "unused_component_outputs",
        |it| {
            format!(
                "{} output {}",
                code_cell(it, "component_name"),
                code_cell(it, "output_name")
            )
        },
    ),
    ("Unused Svelte event", "unused_svelte_events", |it| {
        format!(
            "{} event {}",
            code_cell(it, "component_name"),
            code_cell(it, "event_name")
        )
    }),
    ("Unprovided inject", "unprovided_injects", |it| {
        format!(
            "{} ({})",
            code_cell(it, "key_name"),
            markdown_table_text(s(it, "framework"))
        )
    }),
    ("Unused load data key", "unused_load_data_keys", |it| {
        code_cell(it, "key_name")
    }),
];

/// jq order positions 34-42: dependency hygiene, suppressions, catalog.
const AUDIT_HYGIENE_ROWS: &[AuditRowSpec] = &[
    ("Type-only dependency", "type_only_dependencies", |it| {
        code_cell(it, "package_name")
    }),
    ("Test-only dependency", "test_only_dependencies", |it| {
        code_cell(it, "package_name")
    }),
    (
        "Dev dependency in production",
        "dev_dependencies_in_production",
        |it| code_cell(it, "package_name"),
    ),
    ("Stale suppression", "stale_suppressions", |it| {
        // The description is a literal suppression directive carrying
        // user-authored comment text, so it renders as a code span.
        markdown_table_code_span(str_or(it, "description", "suppression"))
    }),
    ("Unused catalog entry", "unused_catalog_entries", |it| {
        format!(
            "{} ({})",
            code_cell(it, "entry_name"),
            code_cell(it, "catalog_name")
        )
    }),
    ("Empty catalog group", "empty_catalog_groups", |it| {
        code_cell(it, "catalog_name")
    }),
    (
        "Unresolved catalog reference",
        "unresolved_catalog_references",
        |it| {
            format!(
                "{} -> {}",
                code_cell(it, "entry_name"),
                code_cell(it, "catalog_name")
            )
        },
    ),
    (
        "Unused dependency override",
        "unused_dependency_overrides",
        |it| format!("{} ({})", code_cell(it, "raw_key"), code_cell(it, "source")),
    ),
    (
        "Misconfigured dependency override",
        "misconfigured_dependency_overrides",
        |it| format!("{} ({})", code_cell(it, "raw_key"), code_cell(it, "source")),
    ),
];

fn audit_rows_from_table(dead_code: &Value, table: &[AuditRowSpec], rows: &mut Vec<AuditRow>) {
    for (kind, key, item_fn) in table {
        for finding in arr(dead_code, key) {
            rows.push(audit_row(
                kind,
                path_line(finding),
                item_fn(finding),
                finding,
            ));
        }
    }
}

fn member_item(it: &Value) -> String {
    markdown_table_code_span(&format!(
        "{}.{}",
        s(it, "parent_name"),
        s(it, "member_name")
    ))
}

fn component_member_item(it: &Value, member_key: &str) -> String {
    markdown_table_code_span(&format!(
        "{}.{}",
        s(it, "component_name"),
        s(it, member_key)
    ))
}

fn first_import_site(it: &Value) -> String {
    arr(it, "imported_from").next().map_or_else(
        || path_line(it),
        |site| {
            markdown_table_code_span(&format!(
                "{}:{}",
                rel_path_absolute_only(s(site, "path")),
                num(site, "line"),
            ))
        },
    )
}

/// jq order positions 12-15: unlisted dependencies, duplicate exports,
/// circular dependencies, re-export cycles.
fn audit_rows_graph(dead_code: &Value, rows: &mut Vec<AuditRow>) {
    for it in arr(dead_code, "unlisted_dependencies") {
        rows.push(audit_row(
            "Unlisted dependency",
            first_import_site(it),
            code_cell(it, "package_name"),
            it,
        ));
    }
    for it in arr(dead_code, "duplicate_exports") {
        let location = arr(it, "locations")
            .take(3)
            .map(|loc| {
                markdown_table_code_span(&format!(
                    "{}:{}",
                    rel_path_absolute_only(s(loc, "path")),
                    num(loc, "line")
                ))
            })
            .collect::<Vec<_>>()
            .join(", ");
        rows.push(audit_row(
            "Duplicate export",
            location,
            code_cell(it, "export_name"),
            it,
        ));
    }
    for it in arr(dead_code, "circular_dependencies") {
        let location = arr(it, "files")
            .filter_map(Value::as_str)
            .map(|file| markdown_table_code_span(&rel_path_absolute_only(file)))
            .collect::<Vec<_>>()
            .join(" -> ");
        rows.push(audit_row(
            "Circular dependency",
            location,
            "cycle".to_owned(),
            it,
        ));
    }
    for it in arr(dead_code, "re_export_cycles") {
        let location = arr(it, "files")
            .filter_map(Value::as_str)
            .map(|file| markdown_table_code_span(&rel_path_absolute_only(file)))
            .collect::<Vec<_>>()
            .join(" <-> ");
        rows.push(audit_row(
            "Re-export cycle",
            location,
            markdown_table_text(str_or(it, "kind", "cycle")),
            it,
        ));
    }
    for it in arr(dead_code, "package_cycles") {
        let location = arr(it, "packages")
            .filter_map(Value::as_str)
            .map(markdown_table_code_span)
            .collect::<Vec<_>>()
            .join(" -> ");
        let detail = if it.get("group_truncated").and_then(Value::as_bool) == Some(true) {
            format!(
                "cycle ({})",
                fallow_types::results::PackageCycle::GROUP_TRUNCATED_NOTE
            )
        } else {
            "cycle".to_owned()
        };
        rows.push(audit_row("Package cycle", location, detail, it));
    }
}

/// jq order positions 16-19: boundary and policy kinds.
fn audit_rows_boundaries(dead_code: &Value, rows: &mut Vec<AuditRow>) {
    for it in arr(dead_code, "boundary_violations") {
        rows.push(audit_row(
            "Boundary violation",
            rel_path_line_cell(it, "from_path"),
            format!(
                "{} -> {}",
                markdown_table_code_span(s(it, "from_zone")),
                markdown_table_code_span(s(it, "to_zone"))
            ),
            it,
        ));
    }
    for it in arr(dead_code, "boundary_coverage_violations") {
        rows.push(audit_row(
            "Boundary coverage",
            rel_path_line_cell(it, "path"),
            "no matching zone".to_owned(),
            it,
        ));
    }
    for it in arr(dead_code, "boundary_call_violations") {
        rows.push(audit_row(
            "Boundary call",
            rel_path_line_cell(it, "path"),
            format!(
                "{} in {}",
                code_cell(it, "callee"),
                markdown_table_code_span(s(it, "zone"))
            ),
            it,
        ));
    }
    for it in arr(dead_code, "policy_violations") {
        rows.push(audit_row(
            "Policy violation",
            rel_path_line_cell(it, "path"),
            format!(
                "{} banned by {}",
                code_cell(it, "matched"),
                markdown_table_code_span(&format!("{}/{}", s(it, "pack"), s(it, "rule_id")))
            ),
            it,
        ));
    }
}

/// jq order positions 20-25: RSC/Next.js kinds, including unused server
/// actions between misplaced directives and route collisions.
fn audit_rows_frameworks(dead_code: &Value, rows: &mut Vec<AuditRow>) {
    for it in arr(dead_code, "invalid_client_exports") {
        rows.push(audit_row(
            "Invalid client export",
            rel_path_line_cell(it, "path"),
            format!(
                "{} in {}",
                code_cell(it, "export_name"),
                markdown_table_code_span(&format!("\"{}\"", s(it, "directive")))
            ),
            it,
        ));
    }
    for it in arr(dead_code, "mixed_client_server_barrels") {
        rows.push(audit_row(
            "Mixed client/server barrel",
            rel_path_line_cell(it, "path"),
            format!(
                "{} + {}",
                code_cell(it, "client_origin"),
                code_cell(it, "server_origin")
            ),
            it,
        ));
    }
    for it in arr(dead_code, "misplaced_directives") {
        rows.push(audit_row(
            "Misplaced directive",
            rel_path_line_cell(it, "path"),
            markdown_table_code_span(&format!("\"{}\"", s(it, "directive"))),
            it,
        ));
    }
    for it in arr(dead_code, "unused_server_actions") {
        rows.push(audit_row(
            "Unused server action",
            path_line(it),
            code_cell(it, "action_name"),
            it,
        ));
    }
    for it in arr(dead_code, "route_collisions") {
        rows.push(audit_row(
            "Route collision",
            markdown_table_code_span(&rel_path_absolute_only(s(it, "path"))),
            code_cell(it, "url"),
            it,
        ));
    }
    for it in arr(dead_code, "dynamic_segment_name_conflicts") {
        rows.push(audit_row(
            "Dynamic segment conflict",
            markdown_table_code_span(&rel_path_absolute_only(s(it, "path"))),
            markdown_table_code_span(&plain_join(it, "conflicting_segments", ", ")),
            it,
        ));
    }
}

/// Rows in `summary-audit.jq`'s `dead_code_rows` declaration order.
fn audit_dead_code_rows(dead_code: &Value) -> Vec<AuditRow> {
    let mut rows: Vec<AuditRow> = Vec::new();
    for it in arr(dead_code, "unused_files") {
        rows.push(audit_row(
            "Unused file",
            markdown_table_code_span(&rel_path_absolute_only(s(it, "path"))),
            "-".to_owned(),
            it,
        ));
    }
    audit_rows_from_table(dead_code, AUDIT_EXPORT_DEP_ROWS, &mut rows);
    audit_rows_graph(dead_code, &mut rows);
    audit_rows_boundaries(dead_code, &mut rows);
    audit_rows_frameworks(dead_code, &mut rows);
    audit_rows_from_table(dead_code, AUDIT_COMPONENT_ROWS, &mut rows);
    audit_rows_from_table(dead_code, AUDIT_HYGIENE_ROWS, &mut rows);
    rows
}

fn audit_complexity_section(env: &Value) -> String {
    let complexity = env.get("complexity").cloned().unwrap_or(Value::Null);
    let findings: Vec<&Value> = arr(&complexity, "findings").collect();
    if findings.is_empty() {
        return String::new();
    }
    let rows = findings
        .iter()
        .take(15)
        .map(|it| {
            format!(
                "| {} | {} | {} | {} | {} | {} | {} | {} |",
                path_line_cell(it),
                code_cell(it, "name"),
                introduced_label(it),
                markdown_table_text(str_or(it, "severity", "moderate")),
                num(it, "cyclomatic"),
                num(it, "cognitive"),
                markdown_table_text(str_or(it, "coverage_tier", "-")),
                it.get("crap")
                    .filter(|crap| !crap.is_null())
                    .map_or_else(|| "-".to_owned(), fmt_num),
            )
        })
        .collect::<Vec<_>>()
        .join("\n");
    let tail = if findings.len() > 15 {
        format!(
            "\n\n> {} more complexity findings in the full audit report",
            findings.len() - 15,
        )
    } else {
        String::new()
    };
    format!(
        "### Complexity\n\n| File | Function | Status | Severity | Cyclomatic | Cognitive | Coverage | CRAP |\n|:-----|:---------|:-------|:---------|:-----------|:----------|:---------|:-----|\n{rows}{tail}{}\n\n",
        audit_coverage_model_note(&complexity),
    )
}

/// Point at the coverage root only when the coverage file failed to join.
///
/// A low function match rate is ordinary: a coverage file covers the files its
/// test run touched, so a project whose suite exercises a fraction of its
/// modules matches a fraction of its functions with nothing wrong. The signal
/// that a path is misconfigured is files in the coverage file that no analyzed
/// file matched.
fn audit_coverage_join_suffix(summary: &Value) -> String {
    let matched = summary
        .get("istanbul_files_matched")
        .and_then(Value::as_u64);
    let total = summary.get("istanbul_files_total").and_then(Value::as_u64);
    match (matched, total) {
        (Some(matched), Some(total)) if total > 0 && matched == 0 => format!(
            ", from a coverage file describing {total} files that none of the analyzed files matched; check `--coverage-root` is correct for this checkout."
        ),
        (Some(matched), Some(total)) if total > 0 && matched < total => format!(
            ", from {matched} of {total} files in the coverage file; the rest matched no analyzed file."
        ),
        _ => ".".to_owned(),
    }
}

fn audit_coverage_model_note(complexity: &Value) -> String {
    let summary = complexity.get("summary").cloned().unwrap_or(Value::Null);
    let model = summary.get("coverage_model").and_then(Value::as_str);
    match model {
        Some("istanbul") => {
            let matched = summary.get("istanbul_matched").and_then(Value::as_u64);
            let total = summary.get("istanbul_total").and_then(Value::as_u64);
            match (matched, total) {
                (Some(matched), Some(total)) if total > 0 => {
                    format!(
                        "\n\n*Coverage model: istanbul. Matched {matched}/{total} functions{}*",
                        audit_coverage_join_suffix(&summary)
                    )
                }
                _ => "\n\n*Coverage model: istanbul (exact, from `--coverage`).*".to_owned(),
            }
        }
        Some("static_estimated" | "static_binary") => {
            "\n\n*Coverage model: static (estimated). Pair with `--coverage <coverage-final.json>` for measured coverage instead of estimates.*".to_owned()
        }
        _ => String::new(),
    }
}

fn audit_duplication_section(env: &Value) -> String {
    let duplication = env.get("duplication").cloned().unwrap_or(Value::Null);
    let groups: Vec<&Value> = arr(&duplication, "clone_groups").collect();
    if groups.is_empty() {
        return String::new();
    }
    let rows = groups
        .iter()
        .take(10)
        .map(|group| {
            let instances: Vec<&Value> = arr(group, "instances").collect();
            let location = instances.first().map_or_else(
                || "-".to_owned(),
                |first| {
                    let file = s(first, "file");
                    if file.is_empty() {
                        "-".to_owned()
                    } else {
                        let start = first
                            .get("start_line")
                            .filter(|line| !line.is_null())
                            .map_or_else(|| "1".to_owned(), fmt_num);
                        markdown_table_code_span(&format!(
                            "{}:{start}",
                            rel_path_absolute_only(file)
                        ))
                    }
                },
            );
            let mut files: Vec<String> = instances
                .iter()
                .map(|instance| {
                    markdown_table_code_span(&rel_path_absolute_only(s(instance, "file")))
                })
                .collect();
            files.sort();
            files.dedup();
            let files = files.into_iter().take(3).collect::<Vec<_>>().join(", ");
            format!(
                "| {location} | {files} | {} lines / {} tokens | {} | {} |",
                num(group, "line_count"),
                num(group, "token_count"),
                instances.len(),
                introduced_label(group),
            )
        })
        .collect::<Vec<_>>()
        .join("\n");
    let tail = if groups.len() > 10 {
        format!(
            "\n\n> {} more clone groups in the full audit report",
            groups.len() - 10
        )
    } else {
        String::new()
    };
    format!(
        "### Duplication\n\n| Location | Files | Size | Instances | Status |\n|:---------|:------|:-----|----------:|:-------|\n{rows}{tail}\n\n"
    )
}

/// Port of `summary-audit.jq`.
#[must_use]
fn render_audit_summary(env: &Value) -> String {
    let verdict = str_or(env, "verdict", "pass");
    let summary = env.get("summary").cloned().unwrap_or(Value::Null);
    let attribution = env.get("attribution").cloned().unwrap_or(Value::Null);
    let dead_code = env.get("dead_code").cloned().unwrap_or(Value::Null);
    let dead_rows = audit_dead_code_rows(&dead_code);

    let mut out = format!(
        "## Fallow Audit\n\n> {} \u{b7} {} \u{b7} {}ms\n\n| Category | Findings | Introduced | Inherited |\n|:---------|---------:|-----------:|----------:|\n| Dead code | {} | {} | {} |\n| Complexity | {} | {} | {} |\n| Duplication | {} | {} | {} |\n\n",
        audit_verdict_label(verdict),
        plural_n(u(env, "changed_files_count") as usize, "changed file"),
        num(env, "elapsed_ms"),
        num(&summary, "dead_code_issues"),
        num(&attribution, "dead_code_introduced"),
        num(&attribution, "dead_code_inherited"),
        num(&summary, "complexity_findings"),
        num(&attribution, "complexity_introduced"),
        num(&attribution, "complexity_inherited"),
        num(&summary, "duplication_clone_groups"),
        num(&attribution, "duplication_introduced"),
        num(&attribution, "duplication_inherited"),
    );
    if !dead_rows.is_empty() {
        let rows = dead_rows
            .iter()
            .take(10)
            .map(|row| {
                format!(
                    "| {} | {} | {} | {} |",
                    row.kind, row.location, row.item, row.status
                )
            })
            .collect::<Vec<_>>()
            .join("\n");
        let tail = if dead_rows.len() > 10 {
            format!(
                "\n\n> {} more dead-code findings in the full audit report",
                dead_rows.len() - 10
            )
        } else {
            String::new()
        };
        let _ = write!(
            out,
            "### Dead Code\n\n| Type | Location | Item | Status |\n|:-----|:---------|:-----|:-------|\n{rows}{tail}\n\n"
        );
    }
    out.push_str(&audit_complexity_section(env));
    out.push_str(&audit_duplication_section(env));
    out.push_str(if s(&attribution, "gate") == "all" {
        "*Audit gate: all. Every finding in changed files affects the verdict.*"
    } else {
        "*Audit gate: new-only. Inherited findings are reported but do not fail the verdict.*"
    });
    out
}

// ---------------------------------------------------------------------------
// summary-security.jq
// ---------------------------------------------------------------------------

/// Port of `summary-security.jq`.
#[must_use]
fn render_security_summary(env: &Value) -> String {
    let findings: Vec<&Value> = arr(env, "security_findings").collect();
    let gate = env.get("gate").filter(|gate| !gate.is_null());
    let count = gate.map_or_else(
        || {
            env.get("summary")
                .and_then(|summary| summary.get("security_findings"))
                .and_then(Value::as_u64)
                .unwrap_or(findings.len() as u64) as usize
        },
        |gate| u(gate, "new_count") as usize,
    );
    let mut out = String::from("## Fallow Security\n\n");
    if count == 0 {
        let _ = write!(
            out,
            "> [!NOTE]\n> **No security candidates matched** \u{b7} {}ms",
            num(env, "elapsed_ms"),
        );
    } else {
        let _ = write!(
            out,
            "> [!WARNING]\n> **{} matched** \u{b7} {}ms",
            plural_n(count, "security candidate"),
            num(env, "elapsed_ms"),
        );
    }
    if let Some(gate) = gate {
        let _ = write!(
            out,
            "\n\nSecurity gate: `{}`, verdict: `{}`, matching candidates: **{}**.",
            s(gate, "mode"),
            s(gate, "verdict"),
            num(gate, "new_count"),
        );
    }
    if !findings.is_empty() {
        let rows = findings
            .iter()
            .take(15)
            .map(|finding| {
                format!(
                    "| {} | {} | {} | {} |",
                    path_line(finding),
                    markdown_table_text(s(finding, "kind")),
                    markdown_table_text(str_or(finding, "severity", "unknown")),
                    markdown_table_code_span(
                        finding
                            .get("candidate")
                            .and_then(|candidate| candidate.get("sink"))
                            .and_then(|sink| sink.get("callee"))
                            .and_then(Value::as_str)
                            .unwrap_or("-")
                    ),
                )
            })
            .collect::<Vec<_>>()
            .join("\n");
        let _ = write!(
            out,
            "\n\n| Location | Kind | Severity | Sink |\n|:---------|:-----|:---------|:-----|\n{rows}"
        );
        if findings.len() > 15 {
            let _ = write!(
                out,
                "\n\n> {} more candidates in the full report",
                findings.len() - 15,
            );
        }
    }
    out.push_str("\n\nTreat these as candidates for verification, not confirmed vulnerabilities.");
    out
}

// ---------------------------------------------------------------------------
// summary-fix.jq
// ---------------------------------------------------------------------------

/// The entries of one fix type that actually landed (or, in a dry run, would).
/// A withheld entry keeps its `type` so a caller can see which finding was
/// declined, so the skipped flag is what separates the two; listing a withheld
/// removal under "Dependencies removed" would report a write that never
/// happened.
fn fix_entries<'v>(env: &'v Value, entry_type: &str) -> Vec<&'v Value> {
    arr(env, "fixes")
        .filter(|fix| s(fix, "type") == entry_type && !b(fix, "skipped"))
        .collect()
}

fn fix_detail_block(label: &str, entries: &[&Value], row: impl Fn(&Value) -> String) -> String {
    let rows = entries
        .iter()
        .take(25)
        .map(|entry| row(entry))
        .collect::<Vec<_>>()
        .join("\n");
    let tail = if entries.len() > 25 {
        format!("\n- *... and {} more*", entries.len() - 25)
    } else {
        String::new()
    };
    format!("**{label} ({})**\n{rows}{tail}", entries.len())
}

/// Port of `summary-fix.jq`.
#[must_use]
pub fn render_fix_summary(env: &Value) -> String {
    let exports = fix_entries(env, "remove_export");
    let dependencies = fix_entries(env, "remove_dependency");
    let fix_attempts = arr(env, "fixes").filter(|fix| !b(fix, "skipped")).count();
    let content_changed = u(env, "skipped_content_changed") as usize;
    let mixed_eol = u(env, "skipped_mixed_line_endings") as usize;
    let low_confidence = u(env, "skipped_low_confidence_exports") as usize;
    let low_confidence_deps = u(env, "skipped_low_confidence_dependencies") as usize;
    let low_confidence_members = u(env, "skipped_low_confidence_members") as usize;
    let dry_run = b(env, "dry_run");

    if fix_attempts == 0
        && content_changed == 0
        && mixed_eol == 0
        && low_confidence == 0
        && low_confidence_deps == 0
        && low_confidence_members == 0
    {
        return "## Fallow - Auto-fix\n\nNo fixable issues found.".to_owned();
    }

    let mut out = String::from("## Fallow - Auto-fix\n\n");
    out.push_str(if dry_run {
        "**Dry run**: would apply"
    } else {
        "Applied"
    });
    let fix_noun = if fix_attempts == 1 { "fix" } else { "fixes" };
    let _ = write!(out, " **{fix_attempts} {fix_noun}**");
    if !dry_run {
        let _ = write!(out, " ({} succeeded)", num(env, "total_fixed"));
    }
    if content_changed > 0 {
        let _ = write!(
            out,
            ", skipped {content_changed} file(s) that changed since analysis"
        );
    }
    if mixed_eol > 0 {
        let _ = write!(out, ", skipped {mixed_eol} file(s) with mixed line endings");
    }
    if low_confidence > 0 {
        let _ = write!(
            out,
            ", kept exports in {low_confidence} file(s) where consumers may be hidden from static analysis"
        );
    }
    if low_confidence_deps > 0 {
        let _ = write!(
            out,
            ", kept {low_confidence_deps} declared package(s) whose only import may sit in a file this run did not fully read"
        );
    }
    if low_confidence_members > 0 {
        let _ = write!(
            out,
            ", kept {low_confidence_members} unused enum member(s) whose only reference may sit in a file this run did not fully analyze"
        );
    }
    out.push_str("\n\n| Type | Count |\n|------|-------|\n");
    if !exports.is_empty() {
        let _ = writeln!(out, "| Export removals | {} |", exports.len());
    }
    if !dependencies.is_empty() {
        let _ = writeln!(out, "| Dependency removals | {} |", dependencies.len());
    }
    out.push_str("\n<details>\n<summary>View details</summary>\n\n");
    if !exports.is_empty() {
        out.push_str(&fix_detail_block("Export removals", &exports, |it| {
            format!(
                "- {} - {}",
                markdown_code_span(&format!("{}:{}", s(it, "path"), num(it, "line"))),
                markdown_code_span(s(it, "name"))
            )
        }));
        out.push_str("\n\n");
    }
    if !dependencies.is_empty() {
        out.push_str(&fix_detail_block(
            "Dependency removals",
            &dependencies,
            |it| {
                format!(
                    "- {} from {} in {}",
                    markdown_code_span(s(it, "package")),
                    markdown_code_span(s(it, "location")),
                    markdown_code_span(s(it, "file")),
                )
            },
        ));
        out.push('\n');
    }
    out.push_str("\n\n</details>");
    out
}

// ---------------------------------------------------------------------------
// summary-combined.jq
// ---------------------------------------------------------------------------

fn file_link(links: &LinkContext, path: &str, start: &str, end: &str) -> String {
    let display = markdown_table_code_span(&format!("{}:{start}-{end}", last_three_segments(path)));
    if links.repo.is_empty() || links.sha.is_empty() {
        display
    } else {
        format!(
            "[{display}](https://github.com/{}/blob/{}/{}{}#L{start}-L{end})",
            links.repo,
            links.sha,
            links.prefix,
            encode_link_path(path),
        )
    }
}

/// Percent-encode the characters that would break a Markdown link destination
/// or the surrounding table cell.
fn encode_link_path(path: &str) -> String {
    path.replace('%', "%25")
        .replace(' ', "%20")
        .replace('(', "%28")
        .replace(')', "%29")
        .replace('<', "%3C")
        .replace('>', "%3E")
        .replace('|', "%7C")
}

fn exceeded_priority(it: &Value) -> u8 {
    match s(it, "exceeded") {
        "all" => 5,
        "cyclomatic_crap" | "cognitive_crap" => 4,
        "crap" => 3,
        "both" => 2,
        "cyclomatic" | "cognitive" => 1,
        _ => 0,
    }
}

fn severity_priority(it: &Value) -> u8 {
    match s(it, "severity") {
        "critical" => 3,
        "high" => 2,
        "moderate" => 1,
        _ => 0,
    }
}

/// jq `ranked_health_findings`: stable ascending sort by the priority tuple,
/// then a full reverse (ties land in reverse input order).
fn ranked_health_findings(health: &Value) -> Vec<&Value> {
    let mut findings: Vec<&Value> = arr(health, "findings").collect();
    findings.sort_by_key(|it| {
        (
            exceeded_priority(it),
            severity_priority(it),
            it.get("crap").is_some_and(|crap| !crap.is_null()),
            u(it, "cyclomatic"),
            u(it, "cognitive"),
            u(it, "line_count"),
        )
    });
    findings.reverse();
    findings
}

const PROD_FAILING_VERDICTS: &[&str] = &["safe_to_delete", "review_required", "low_traffic"];

struct CombinedCounts {
    check: usize,
    dupes: usize,
    complex: usize,
    prod_failing: usize,
    prod_advisory: usize,
    hot_paths: usize,
}

impl CombinedCounts {
    fn health(&self) -> usize {
        self.complex + self.prod_failing
    }

    fn total(&self) -> usize {
        self.check + self.dupes + self.health()
    }
}

fn combined_counts(env: &Value) -> CombinedCounts {
    let check = env
        .get("check")
        .map_or(0, |check| u(check, "total_issues") as usize);
    // Visible groups plus what a presentation cap withheld, NOT
    // `stats.clone_groups`. The two differ for two unrelated reasons and only
    // one of them belongs here: a filtered combined run leaves `stats`
    // describing the unfiltered corpus while `clone_groups[]` holds the
    // actionable set, and counting `stats` there reports issues a reader
    // cannot inspect (issue #1250); a presentation cap such as `--top`
    // truncates the array while `stats` stays right. `clone_groups_omitted`
    // counts only the second, and no combined envelope carries it today
    // because the bare command takes no `--top`.
    let dupes = env.get("dupes").map_or(0, |dupes| {
        arr(dupes, "clone_groups")
            .count()
            .saturating_add(u(dupes, "clone_groups_omitted") as usize)
    });
    let health = env.get("health").cloned().unwrap_or(Value::Null);
    let complex = health.get("summary").map_or(0, |summary| {
        u(summary, "functions_above_threshold") as usize
    });
    let runtime = health
        .get("runtime_coverage")
        .cloned()
        .unwrap_or(Value::Null);
    let prod_failing = arr(&runtime, "findings")
        .filter(|finding| PROD_FAILING_VERDICTS.contains(&s(finding, "verdict")))
        .count();
    let prod_advisory = arr(&runtime, "findings")
        .filter(|finding| !PROD_FAILING_VERDICTS.contains(&s(finding, "verdict")))
        .count();
    let hot_paths = arr(&runtime, "hot_paths").count();
    CombinedCounts {
        check,
        dupes,
        complex,
        prod_failing,
        prod_advisory,
        hot_paths,
    }
}

fn hot_path_label(env: &Value, n: usize) -> String {
    let touched = env
        .get("health")
        .and_then(|health| health.get("runtime_coverage"))
        .is_some_and(|runtime| s(runtime, "verdict") == "hot-path-touched");
    let plural = if n == 1 { "" } else { "s" };
    if touched {
        format!("hot path{plural} touched")
    } else {
        format!("hot path{plural}")
    }
}

fn combined_zero_case(env: &Value, counts: &CombinedCounts) -> String {
    let vitals = env
        .get("health")
        .and_then(|health| health.get("vital_signs"))
        .cloned()
        .unwrap_or(Value::Null);
    let mut out = String::from("# \u{1F33F} Fallow\n\n");
    if counts.prod_advisory > 0 || counts.hot_paths > 0 {
        out.push_str(
            "> [!NOTE]\n> **Quality gate passed**\n\n:white_check_mark: No code issues \u{b7} :white_check_mark: No duplication \u{b7} :white_check_mark: No blocking health findings",
        );
        if counts.prod_advisory > 0 {
            let _ = write!(
                out,
                " \u{b7} :information_source: **{}** runtime coverage advisory finding{}",
                counts.prod_advisory,
                if counts.prod_advisory == 1 { "" } else { "s" },
            );
        }
        if counts.hot_paths > 0 {
            let _ = write!(
                out,
                " \u{b7} :eyes: **{}** {}",
                counts.hot_paths,
                hot_path_label(env, counts.hot_paths),
            );
        }
    } else {
        out.push_str(
            "> [!NOTE]\n> **Quality gate passed**\n\n:white_check_mark: No code issues \u{b7} :white_check_mark: No duplication \u{b7} :white_check_mark: No complex functions",
        );
    }
    if let Some(maintainability) = opt_f(&vitals, "maintainability_avg") {
        let _ = write!(
            out,
            "\n\n| Metric | Value |\n|:-------|------:|\n| [Maintainability]({HEALTH_DOCS}#maintainability-index-mi) | **{}** / 100 |\n",
            pct(maintainability),
        );
    }
    out
}

fn combined_status_line(env: &Value, counts: &CombinedCounts) -> String {
    let mut out = String::new();
    if counts.check > 0 {
        let _ = write!(
            out,
            ":warning: **{}** code {}",
            counts.check,
            if counts.check == 1 { "issue" } else { "issues" },
        );
    } else {
        out.push_str(":white_check_mark: No code issues");
    }
    out.push_str(" \u{b7} ");
    if counts.dupes > 0 {
        let _ = write!(
            out,
            ":warning: **{}** clone {}",
            counts.dupes,
            if counts.dupes == 1 { "group" } else { "groups" },
        );
    } else {
        out.push_str(":white_check_mark: No duplication");
    }
    out.push_str(" \u{b7} ");
    let health = counts.health();
    if health > 0 {
        let _ = write!(
            out,
            ":warning: **{health}** health {}",
            if health == 1 { "finding" } else { "findings" },
        );
    } else {
        out.push_str(":white_check_mark: No blocking health findings");
    }
    if counts.prod_advisory > 0 {
        let _ = write!(
            out,
            " \u{b7} :information_source: **{}** coverage advisory finding{}",
            counts.prod_advisory,
            if counts.prod_advisory == 1 { "" } else { "s" },
        );
    }
    if counts.hot_paths > 0 {
        let _ = write!(
            out,
            " \u{b7} :eyes: **{}** {}",
            counts.hot_paths,
            hot_path_label(env, counts.hot_paths),
        );
    }
    out.push_str("\n\n");
    out
}

fn combined_check_breakdown(env: &Value, counts: &CombinedCounts) -> String {
    if counts.check == 0 {
        return String::new();
    }
    let check = env.get("check").cloned().unwrap_or(Value::Null);
    format!(
        "<details>\n<summary><strong><a href=\"{DEAD_CODE_DOCS}\">Code issues</a> ({})</strong></summary>\n\n| Category | Count |\n|:---------|------:|\n{}\n\n</details>\n\n",
        counts.check,
        dead_code_category_table(&check),
    )
}

fn combined_dupes_breakdown(env: &Value, counts: &CombinedCounts, links: &LinkContext) -> String {
    if counts.dupes == 0 {
        return String::new();
    }
    let dupes = env.get("dupes").cloned().unwrap_or(Value::Null);
    let stats = dupes.get("stats").cloned().unwrap_or(Value::Null);
    let groups = sorted_clone_groups(&dupes);
    let files_with_clones = u(&stats, "files_with_clones") as usize;
    let rows = groups
        .iter()
        .take(5)
        .map(|group| {
            let locations = arr(group, "instances")
                .map(|instance| {
                    file_link(
                        links,
                        s(instance, "file"),
                        &num(instance, "start_line"),
                        &num(instance, "end_line"),
                    )
                })
                .collect::<Vec<_>>()
                .join("<br>");
            format!(
                "| {locations} | {} | {} |",
                num(group, "line_count"),
                num(group, "token_count"),
            )
        })
        .collect::<Vec<_>>()
        .join("\n");
    let tail = if counts.dupes > 5 {
        format!("\n\n*\u{2026} and {} more groups.*", counts.dupes - 5)
    } else {
        String::new()
    };
    format!(
        "<details>\n<summary><strong><a href=\"{DUPES_DOCS}\">Duplication</a> ({} {} \u{b7} {} lines \u{b7} {}%)</strong></summary>\n\n| Locations | Lines | Tokens |\n|:----------|------:|-------:|\n{rows}{tail}\n\nAcross {files_with_clones} {}.\n\n</details>\n\n",
        counts.dupes,
        if counts.dupes == 1 { "group" } else { "groups" },
        num(&stats, "duplicated_lines"),
        pct(f_or_zero(&stats, "duplication_percentage")),
        if files_with_clones == 1 {
            "file"
        } else {
            "files"
        },
    )
}

fn combined_complexity_breakdown(env: &Value, counts: &CombinedCounts) -> String {
    if counts.complex == 0 {
        return String::new();
    }
    let health = env.get("health").cloned().unwrap_or(Value::Null);
    let summary = health.get("summary").cloned().unwrap_or(Value::Null);
    let findings = ranked_health_findings(&health);
    let show_crap = summary
        .get("max_crap_threshold")
        .is_some_and(|threshold| !threshold.is_null())
        || findings
            .iter()
            .any(|finding| finding.get("crap").is_some_and(|crap| !crap.is_null()));
    let cyc_t = threshold_or(&summary, "max_cyclomatic_threshold", "default");
    let cog_t = threshold_or(&summary, "max_cognitive_threshold", "default");
    let crap_t = threshold_or(&summary, "max_crap_threshold", "default");
    let crap_header = if show_crap {
        format!(" | [CRAP]({HEALTH_DOCS}#crap-score)")
    } else {
        String::new()
    };
    let crap_separator = if show_crap { "|-----:" } else { "" };
    let rows = findings
        .iter()
        .take(5)
        .map(|it| {
            let crap_column = if show_crap {
                format!(" | {}", crap_cell(it))
            } else {
                String::new()
            };
            format!(
                "| {} | {} | {} | {}{} | {}{}{crap_column} | {} |",
                markdown_table_code_span(&format!(
                    "{}:{}",
                    last_three_segments(s(it, "path")),
                    num(it, "line")
                )),
                code_cell(it, "name"),
                markdown_table_text(str_or(it, "severity", "moderate")),
                num(it, "cyclomatic"),
                exceeded_marker(it, &["cyclomatic", "both", "all"]),
                num(it, "cognitive"),
                exceeded_marker(it, &["cognitive", "both", "all"]),
                num(it, "line_count"),
            )
        })
        .collect::<Vec<_>>()
        .join("\n");
    let crap_footer = if show_crap {
        format!(", CRAP >= {crap_t}")
    } else {
        String::new()
    };
    format!(
        "<details>\n<summary><strong><a href=\"{HEALTH_DOCS}#complexity-metrics\">Complexity</a> ({} {} above threshold)</strong></summary>\n\n| File | Function | Severity | [Cyclomatic]({HEALTH_DOCS}#cyclomatic-complexity) | [Cognitive]({HEALTH_DOCS}#cognitive-complexity){crap_header} | Lines |\n|:-----|:---------|:---------|----------:|---------:{crap_separator}|------:|\n{rows}\n\n**{}** files, **{}** functions analyzed (thresholds: cyclomatic > {cyc_t}, cognitive > {cog_t}{crap_footer})\n\n</details>\n\n",
        counts.complex,
        if counts.complex == 1 {
            "function"
        } else {
            "functions"
        },
        threshold_or(&summary, "files_analyzed", "unknown"),
        threshold_or(&summary, "functions_analyzed", "unknown"),
    )
}

fn combined_runtime_breakdown(env: &Value, counts: &CombinedCounts) -> String {
    let prod_total = counts.prod_failing + counts.prod_advisory;
    if prod_total == 0 && counts.hot_paths == 0 {
        return String::new();
    }
    let runtime = env
        .get("health")
        .and_then(|health| health.get("runtime_coverage"))
        .cloned()
        .unwrap_or(Value::Null);
    let hot_suffix = if counts.hot_paths > 0 {
        format!(
            ", {} {}",
            counts.hot_paths,
            hot_path_label(env, counts.hot_paths)
        )
    } else {
        String::new()
    };
    let mut out = format!(
        "<details>\n<summary><strong><a href=\"{HEALTH_DOCS}#runtime-coverage\">Runtime coverage</a> ({prod_total} finding{}{hot_suffix})</strong></summary>\n\n",
        if prod_total == 1 { "" } else { "s" },
    );
    if prod_total > 0 {
        out.push_str("| File | Function | Verdict | Invocations | Confidence |\n|:-----|:---------|:--------|------------:|:-----------|\n");
        out.push_str(
            &arr(&runtime, "findings")
                .take(5)
                .map(|it| {
                    let invocations = it
                        .get("invocations")
                        .filter(|value| !value.is_null())
                        .map_or_else(|| "-".to_owned(), fmt_num);
                    format!(
                        "| {} | {} | {} | {invocations} | {} |",
                        markdown_table_code_span(&format!(
                            "{}:{}",
                            last_three_segments(s(it, "path")),
                            num(it, "line")
                        )),
                        code_cell(it, "function"),
                        code_cell(it, "verdict"),
                        markdown_table_text(s(it, "confidence")),
                    )
                })
                .collect::<Vec<_>>()
                .join("\n"),
        );
        if counts.hot_paths > 0 {
            out.push_str("\n\n");
        }
    }
    if counts.hot_paths > 0 {
        out.push_str("| File | Function | Invocations | Percentile |\n|:-----|:---------|------------:|-----------:|\n");
        out.push_str(
            &arr(&runtime, "hot_paths")
                .take(5)
                .map(|it| {
                    format!(
                        "| {} | {} | {} | {} |",
                        markdown_table_code_span(&format!(
                            "{}:{}",
                            last_three_segments(s(it, "path")),
                            num(it, "line")
                        )),
                        code_cell(it, "function"),
                        num(it, "invocations"),
                        num(it, "percentile"),
                    )
                })
                .collect::<Vec<_>>()
                .join("\n"),
        );
        out.push_str("\n\n");
    }
    out.push_str("</details>\n\n");
    out
}

fn combined_vitals(env: &Value) -> String {
    let health = env.get("health").cloned().unwrap_or(Value::Null);
    let vitals = health.get("vital_signs").cloned().unwrap_or(Value::Null);
    let has_vitals = vitals.as_object().is_some_and(|vitals| !vitals.is_empty());
    if !has_vitals {
        return String::new();
    }
    let scores: Vec<f64> = arr(&health, "file_scores")
        .filter_map(|score| opt_f(score, "maintainability_index"))
        .collect();
    let scoped_maintainability = if scores.is_empty() {
        None
    } else {
        let avg = scores.iter().sum::<f64>() / scores.len() as f64;
        Some((avg * 10.0).round() / 10.0)
    };
    let mut out = format!(
        "#### [Codebase health]({HEALTH_DOCS})\n\n| Metric | Value |\n|:-------|------:|\n"
    );
    let maintainability = opt_f(&vitals, "maintainability_avg");
    if let Some(avg) = maintainability {
        let _ = writeln!(
            out,
            "| [Maintainability]({HEALTH_DOCS}#maintainability-index-mi) | **{}** / 100 |",
            pct(avg),
        );
    }
    if let Some(scoped) = scoped_maintainability {
        let rounded_avg = (maintainability.unwrap_or_default() * 10.0).round() / 10.0;
        if (scoped - rounded_avg).abs() > f64::EPSILON {
            let _ = writeln!(
                out,
                "| [Maintainability]({HEALTH_DOCS}#maintainability-index-mi) (changed files) | **{}** / 100 |",
                fmt_num(&serde_json::json!(scoped)),
            );
        }
    }
    if let Some(avg_cyclomatic) = opt_f(&vitals, "avg_cyclomatic") {
        let _ = writeln!(
            out,
            "| [Avg complexity]({HEALTH_DOCS}#cyclomatic-complexity) | {} |",
            pct(avg_cyclomatic),
        );
    }
    if let Some(population) = vitals
        .get("cyclomatic_population")
        .filter(|value| value.is_object())
    {
        let _ = writeln!(
            out,
            "| Cyclomatic units | Functions: {}, module scopes: {}, templates: {} |",
            num(&population["functions"], "count"),
            num(&population["modules"], "count"),
            num(&population["templates"], "count")
        );
        if let Some(max) = population["modules"]["max"].as_u64() {
            let _ = writeln!(
                out,
                "| Module-scope max cyclomatic (aggregate only) | {max} |"
            );
        }
    }
    out.push('\n');
    out
}

fn combined_tips(env: &Value) -> String {
    let check = env.get("check").cloned().unwrap_or(Value::Null);
    let fixable = arr(&check, "unused_exports").count()
        + arr(&check, "unused_dependencies").count()
        + arr(&check, "unused_enum_members").count();
    if fixable == 0 {
        return String::new();
    }
    let mut out = String::from("> [!TIP]\n> Run `fallow fix --dry-run` to preview auto-fixes.\n");
    if arr(&check, "unused_exports").count() > 0 {
        let _ = writeln!(
            out,
            "> Add [`/** @public */`]({SUPPRESSION_DOCS}) above exports to preserve them."
        );
    }
    out
}

/// Port of `summary-combined.jq`.
#[must_use]
fn render_combined_summary(env: &Value, links: &LinkContext) -> String {
    let counts = combined_counts(env);
    let header = health_score_header(&env.get("health").cloned().unwrap_or(Value::Null));
    if counts.total() == 0 {
        return format!("{header}{}", combined_zero_case(env, &counts));
    }
    let pointer = if counts.check > 0 || counts.dupes > 0 || counts.health() > 0 {
        "See inline review comments for per-finding details.\n\n"
    } else {
        ""
    };
    format!(
        "{header}# \u{1F33F} Fallow\n\n> [!WARNING]\n> **Review needed**\n\n{}{pointer}{}{}{}{}{}{}",
        combined_status_line(env, &counts),
        combined_check_breakdown(env, &counts),
        combined_dupes_breakdown(env, &counts, links),
        combined_complexity_breakdown(env, &counts),
        combined_runtime_breakdown(env, &counts),
        combined_vitals(env),
        combined_tips(env),
    )
}

#[cfg(test)]
mod tests {
    use std::collections::BTreeSet;

    use fallow_types::issue_meta::counted_result_issue_metas;

    use super::DEAD_CODE_CATEGORIES;

    /// Every counted dead-code kind needs a summary row with the registry
    /// label and docs anchor, and every summary row needs a registry kind.
    #[test]
    fn dead_code_categories_match_counted_result_metadata() {
        let native: BTreeSet<(&str, &str, &str)> = DEAD_CODE_CATEGORIES.iter().copied().collect();
        assert_eq!(
            native.len(),
            DEAD_CODE_CATEGORIES.len(),
            "DEAD_CODE_CATEGORIES has a duplicate row"
        );
        let registry: BTreeSet<(&str, &str, &str)> = counted_result_issue_metas()
            .map(|meta| (meta.summary_label, meta.result_key, meta.docs_anchor))
            .collect();
        let missing: Vec<_> = registry.difference(&native).collect();
        let extra: Vec<_> = native.difference(&registry).collect();
        assert!(
            missing.is_empty() && extra.is_empty(),
            "DEAD_CODE_CATEGORIES must match the counted result metadata \
             (label, result key, docs anchor).\nMissing rows: {missing:?}\nRows not in the registry: {extra:?}"
        );
    }

    /// Rows without a path or line tie on the first two keys. The serialized
    /// row breaks the tie, so the rendered order does not depend on the input
    /// order. The rows past the rendered limit are counted, not listed.
    #[test]
    fn pathless_rows_render_in_one_order_for_any_input_order() {
        let envelope = |names: &[String]| {
            serde_json::json!({
                "total_issues": names.len(),
                "elapsed_ms": 1,
                "unlisted_dependencies": names
                    .iter()
                    .map(|name| serde_json::json!({ "package_name": name, "imported_from": [] }))
                    .collect::<Vec<_>>(),
            })
        };
        let names: Vec<String> = (0..40).map(|index| format!("pkg-{index:02}")).collect();
        let mut reversed = names.clone();
        reversed.reverse();
        let ordered = super::render_check_summary(&envelope(&names));
        assert_eq!(super::render_check_summary(&envelope(&reversed)), ordered);
        let first = ordered.find("pkg-00").expect("first row");
        let second = ordered.find("pkg-01").expect("second row");
        assert!(
            first < second,
            "rows follow the serialized order: {ordered}"
        );
        assert!(
            !ordered.contains("pkg-39"),
            "rows past the limit are counted only"
        );
        assert!(
            ordered.contains("15 more"),
            "the tail counts the rest: {ordered}"
        );
    }

    /// A saved `--group-by` envelope lists rows group by group. The summary
    /// renders them in one order whatever the input order is.
    #[test]
    fn dead_code_rows_render_in_one_order_for_any_input_order() {
        let envelope = |paths: [&str; 3]| {
            serde_json::json!({
                "total_issues": 3,
                "elapsed_ms": 1,
                "unused_files": paths.map(|path| serde_json::json!({ "path": path })),
            })
        };
        let flat = super::render_check_summary(&envelope(["src/a.ts", "src/b.ts", "src/c.ts"]));
        let grouped = super::render_check_summary(&envelope(["src/a.ts", "src/c.ts", "src/b.ts"]));
        assert_eq!(grouped, flat);
        let a = flat.find("`src/a.ts`").expect("a");
        let b = flat.find("`src/b.ts`").expect("b");
        let c = flat.find("`src/c.ts`").expect("c");
        assert!(a < b && b < c, "rows follow path order: {flat}");
    }
}