agentsec-core 0.5.0

//! Markdown renderers.
//!
//! Two entry points:
//!
//! - [`render`] — full scan report from a [`ScanOutcome`].
//! - [`render_diff`] — standalone diff section from a
//!   [`crate::scan::diff::DiffReport`], used by `agentsec diff` and the
//!   `scan_diff` MCP tool.
//!
//! ## `render` output sections (always in this order)
//!
//! 1. `# AgentSec scan — <RFC 3339 UTC>` header + total path count.
//! 2. `## Inventory` table with one row per [`crate::scan::inventory::PathEntry`].
//! 3. `## Diff vs previous snapshot` — `_no previous snapshot — this is the
//!    baseline._` on first run, `_no changes._` when the diff is empty,
//!    otherwise three subsections (`### Added`, `### Modified`,
//!    `### Removed`).
//! 4. Footer line with the absolute snapshot path.
//!
//! Pure functions: no I/O, no allocation beyond the output string.

use crate::diagnostics::{
    DoctorReport, DoctorStatus, EnvSource, InfoReport, RecentActivityReport, StatusReport,
};
use crate::platform::PlatformProbe;
use crate::scan::unknown::{UnknownVerdict, UnknownVerdictKind};
use crate::scan::{ScanOutcome, ScanReport, diff::DiffReport};
use std::collections::HashSet;
use std::fmt::Write;

/// Render `outcome` as a Markdown report (see module docs §`render` output
/// sections for the schema).
pub fn render(outcome: &ScanOutcome) -> String {
    let mut s = String::new();
    write_header(&mut s, &outcome.report);
    write_inventory(&mut s, &outcome.report);
    write_diff(&mut s, outcome);
    write_footer(&mut s, outcome);
    s
}

fn write_header(s: &mut String, report: &ScanReport) {
    let _ = writeln!(s, "# AgentSec scan — {}", report.scanned_at.to_rfc3339());
    let _ = writeln!(s);
    let _ = writeln!(s, "Total paths inventoried: **{}**", report.paths.len());
    let _ = writeln!(s);
}

fn write_inventory(s: &mut String, report: &ScanReport) {
    let _ = writeln!(s, "## Inventory");
    let _ = writeln!(s);
    if report.paths.is_empty() {
        let _ = writeln!(s, "_no targets present._");
        let _ = writeln!(s);
        return;
    }
    let _ = writeln!(s, "| category | path | size | sha256 |");
    let _ = writeln!(s, "|---|---|---|---|");
    for p in &report.paths {
        let _ = writeln!(
            s,
            "| {} | `{}` | {} | `{}` |",
            p.category,
            p.path.display(),
            p.size,
            &p.sha256[..16]
        );
    }
    let _ = writeln!(s);
}

fn write_diff(s: &mut String, outcome: &ScanOutcome) {
    let Some(diff) = &outcome.diff else {
        let _ = writeln!(s, "## Diff vs previous snapshot");
        let _ = writeln!(s);
        let _ = writeln!(s, "_no previous snapshot — this is the baseline._");
        let _ = writeln!(s);
        return;
    };
    let _ = writeln!(s, "## Diff vs previous snapshot");
    let _ = writeln!(s);
    if diff.is_empty() {
        let _ = writeln!(s, "_no changes._");
        let _ = writeln!(s);
        return;
    }
    if !diff.added.is_empty() {
        let _ = writeln!(s, "### Added ({})", diff.added.len());
        for e in &diff.added {
            let _ = writeln!(s, "- `{}` ({} bytes)", e.path.display(), e.size);
        }
        let _ = writeln!(s);
    }
    if !diff.modified.is_empty() {
        let _ = writeln!(s, "### Modified ({})", diff.modified.len());
        for c in &diff.modified {
            let _ = writeln!(
                s,
                "- `{}` ({} → {} bytes, sha256 `{}` → `{}`)",
                c.path.display(),
                c.prev_size,
                c.curr_size,
                &c.prev_sha256[..8],
                &c.curr_sha256[..8]
            );
        }
        let _ = writeln!(s);
    }
    if !diff.removed.is_empty() {
        let _ = writeln!(s, "### Removed ({})", diff.removed.len());
        for e in &diff.removed {
            let _ = writeln!(s, "- `{}`", e.path.display());
        }
        let _ = writeln!(s);
    }
}

/// Collect every category each probe flags as security-critical.
/// Changes to these categories are prefixed with `🚨 **CRITICAL**` in
/// the diff render. The set is built per render call rather than
/// being a `const` so that platform-specific categories live with the
/// owning probe (see [`PlatformProbe::critical_categories`]).
fn critical_set<'a>(probes: &'a [&dyn PlatformProbe]) -> HashSet<&'a str> {
    let mut set = HashSet::new();
    for probe in probes {
        for cat in probe.critical_categories() {
            set.insert(*cat);
        }
    }
    set
}

/// Render a standalone diff report as Markdown.
///
/// Schema:
///
/// - `# AgentSec diff vs <baseline-path-or-"latest snapshot">` — header.
/// - If the diff is empty, a single `_no changes._` line and nothing else.
/// - Otherwise the three `### Added` / `### Modified` / `### Removed`
///   subsections, each omitted when its vector is empty.
/// - Lines whose inventory category is security-critical are prefixed with
///   `🚨 **CRITICAL**`; within each section, critical entries appear before
///   non-critical entries (highest-severity first).
///
/// Pass `baseline_hint` as `Some("/path/to/snapshot")` to put the
/// snapshot path in the header, or `None` for the generic phrasing.
pub fn render_diff(
    diff: &DiffReport,
    baseline_hint: Option<&str>,
    probes: &[&dyn PlatformProbe],
) -> String {
    let crit = critical_set(probes);
    let is_crit_cat = |c: &str| crit.contains(c);
    let mut s = String::new();
    let header = match baseline_hint {
        Some(p) => format!("# AgentSec diff vs `{p}`\n\n"),
        None => "# AgentSec diff vs latest snapshot\n\n".to_string(),
    };
    s.push_str(&header);
    if diff.is_empty() {
        let _ = writeln!(s, "_no changes._");
        return s;
    }
    if !diff.added.is_empty() {
        let _ = writeln!(s, "### Added ({})", diff.added.len());
        // Sort: critical first, then by path.
        let mut sorted: Vec<_> = diff.added.iter().collect();
        sorted.sort_by(|a, b| {
            let a_crit = is_crit_cat(&a.category);
            let b_crit = is_crit_cat(&b.category);
            b_crit.cmp(&a_crit).then_with(|| a.path.cmp(&b.path))
        });
        for e in sorted {
            let prefix = if is_crit_cat(&e.category) {
                "🚨 **CRITICAL** "
            } else {
                ""
            };
            let _ = writeln!(s, "- {prefix}`{}` ({} bytes)", e.path.display(), e.size);
        }
        let _ = writeln!(s);
    }
    if !diff.modified.is_empty() {
        let _ = writeln!(s, "### Modified ({})", diff.modified.len());
        // Sort: critical first, then by path. `Change` carries the
        // category through from the original `PathEntry`, so the same
        // probe-driven critical set drives Modified entries too.
        let mut sorted_modified: Vec<_> = diff.modified.iter().collect();
        sorted_modified.sort_by(|a, b| {
            let a_crit = is_crit_cat(&a.category);
            let b_crit = is_crit_cat(&b.category);
            b_crit.cmp(&a_crit).then_with(|| a.path.cmp(&b.path))
        });
        for c in sorted_modified {
            let prefix = if is_crit_cat(&c.category) {
                "🚨 **CRITICAL** "
            } else {
                ""
            };
            let _ = writeln!(
                s,
                "- {prefix}`{}` ({} → {} bytes, sha256 `{}` → `{}`)",
                c.path.display(),
                c.prev_size,
                c.curr_size,
                &c.prev_sha256[..8],
                &c.curr_sha256[..8]
            );
        }
        let _ = writeln!(s);
    }
    if !diff.removed.is_empty() {
        let _ = writeln!(s, "### Removed ({})", diff.removed.len());
        let mut sorted: Vec<_> = diff.removed.iter().collect();
        sorted.sort_by(|a, b| {
            let a_crit = is_crit_cat(&a.category);
            let b_crit = is_crit_cat(&b.category);
            b_crit.cmp(&a_crit).then_with(|| a.path.cmp(&b.path))
        });
        for e in sorted {
            let prefix = if is_crit_cat(&e.category) {
                "🚨 **CRITICAL** "
            } else {
                ""
            };
            let _ = writeln!(s, "- {prefix}`{}`", e.path.display());
        }
        let _ = writeln!(s);
    }
    s
}

/// Render BlackList classify verdicts as Markdown.
///
/// Empty input ⇒ a single `_no MCP servers found in any platform
/// config._` notice. Otherwise four subsections in order:
/// `### Known-good`, `### Likely typosquat (warn)`,
/// `### Informational typosquat (info)`, `### Unknown`.
/// Each subsection is omitted when its bucket is empty.
///
/// Typosquat entries include a `×N projects` count and a bullet path list.
pub fn render_blacklist(verdicts: &[UnknownVerdict], registry_size: usize) -> String {
    let mut s = String::new();
    let _ = writeln!(s, "# AgentSec BlackList check");
    let _ = writeln!(s);
    let _ = writeln!(s, "Registry: {registry_size} known-good entries.");
    let _ = writeln!(s);
    if verdicts.is_empty() {
        let _ = writeln!(s, "_no MCP servers found in any platform config._");
        return s;
    }
    let mut good = Vec::new();
    let mut likely = Vec::new();
    let mut informational = Vec::new();
    let mut unk = Vec::new();
    for v in verdicts {
        match &v.verdict {
            UnknownVerdictKind::KnownGood => good.push(v),
            UnknownVerdictKind::LikelyTyposquat { .. } => likely.push(v),
            UnknownVerdictKind::InformationalTyposquat { .. } => informational.push(v),
            UnknownVerdictKind::Unknown => unk.push(v),
        }
    }
    if !good.is_empty() {
        let _ = writeln!(s, "### Known-good ({})", good.len());
        for v in good {
            let paths_line = v.paths.join(", ");
            let _ = writeln!(
                s,
                "- `{}` ×{} — {} (from `{}`)",
                v.name, v.count, v.reason, paths_line
            );
        }
        let _ = writeln!(s);
    }
    if !likely.is_empty() {
        let _ = writeln!(s, "### Likely typosquat (warn) ({})", likely.len());
        for v in likely {
            let _ = writeln!(s, "- `{}` ×{} — {}", v.name, v.count, v.reason);
            for p in &v.paths {
                let _ = writeln!(s, "  - `{p}`");
            }
        }
        let _ = writeln!(s);
    }
    if !informational.is_empty() {
        let _ = writeln!(
            s,
            "### Informational typosquat (info) ({})",
            informational.len()
        );
        for v in informational {
            let _ = writeln!(s, "- `{}` ×{} — {}", v.name, v.count, v.reason);
            for p in &v.paths {
                let _ = writeln!(s, "  - `{p}`");
            }
        }
        let _ = writeln!(s);
    }
    if !unk.is_empty() {
        let _ = writeln!(s, "### Unknown ({})", unk.len());
        for v in unk {
            let paths_line = v.paths.join(", ");
            let _ = writeln!(s, "- `{}` ×{} (from `{}`)", v.name, v.count, paths_line);
        }
        let _ = writeln!(s);
    }
    s
}

/// Render an [`InfoReport`] as Markdown.
///
/// Section schema:
///
/// - `# AgentSec — info`
/// - `## Version`
/// - `## Paths`
/// - `## Environment` — one row per tracked env var with source +
///   value (redacted if secret).
pub fn render_info(report: &InfoReport) -> String {
    let mut s = String::new();
    let _ = writeln!(s, "# AgentSec — info");
    let _ = writeln!(s);
    let _ = writeln!(s, "## Version");
    let _ = writeln!(s);
    let _ = writeln!(s, "- agentsec-core: `{}`", report.version);
    let _ = writeln!(s);
    let _ = writeln!(s, "## Paths");
    let _ = writeln!(s);
    let p = &report.paths;
    let _ = writeln!(s, "- home:       `{}`", p.home.display());
    let _ = writeln!(s, "- user_home:  `{}`", p.user_home.display());
    let _ = writeln!(s, "- snapshots:  `{}`", p.snapshots.display());
    let _ = writeln!(s, "- scans:      `{}`", p.scans.display());
    let _ = writeln!(s, "- web_log:    `{}`", p.web_log.display());
    let _ = writeln!(s, "- paste_log:  `{}`", p.paste_log.display());
    let _ = writeln!(s);
    let _ = writeln!(s, "## Environment");
    let _ = writeln!(s);
    let _ = writeln!(s, "| Key | Source | Value |");
    let _ = writeln!(s, "|---|---|---|");
    for ev in &report.env {
        let source = render_env_source(&ev.source);
        let value = ev.value_display.clone().unwrap_or_else(|| "—".into());
        let _ = writeln!(s, "| `{}` | {source} | `{value}` |", ev.key);
    }
    s
}

fn render_env_source(src: &EnvSource) -> String {
    match src {
        EnvSource::Process => "process env".into(),
        EnvSource::DotenvFile { path, line } => {
            format!("dotenv: `{}:{}`", path.display(), line)
        }
        EnvSource::DotenvFileShadowed { path, line } => {
            format!(
                "dotenv `{}:{}` (shadowed by process env)",
                path.display(),
                line
            )
        }
        EnvSource::Default(_) => "builtin default".into(),
        EnvSource::Unset => "unset".into(),
    }
}

/// Render a [`StatusReport`] as Markdown.
pub fn render_status(report: &StatusReport) -> String {
    let mut s = String::new();
    let _ = writeln!(s, "# AgentSec — status");
    let _ = writeln!(s);
    let _ = writeln!(s, "| Metric | Value |");
    let _ = writeln!(s, "|---|---|");
    let _ = writeln!(s, "| snapshots          | {} |", report.snapshots_count);
    let _ = writeln!(
        s,
        "| latest snapshot    | {} |",
        report.latest_snapshot.as_deref().unwrap_or("—")
    );
    let _ = writeln!(s, "| paste_log entries  | {} |", report.paste_log_count);
    let _ = writeln!(s, "| web_log entries    | {} |", report.web_log_count);
    let _ = writeln!(
        s,
        "| plain mode active  | {} |",
        if report.plain_mode_active {
            "yes"
        } else {
            "no"
        }
    );
    let _ = writeln!(s, "| plain mode entries | {} |", report.plain_mode_entries);
    let _ = writeln!(s, "| registry entries   | {} |", report.registry_entries);

    if !report.storage.is_empty() {
        let _ = writeln!(s);
        let _ = writeln!(s, "## Storage");
        let _ = writeln!(s);
        let _ = writeln!(s, "| Kind | Path | Count | Size | Latest |");
        let _ = writeln!(s, "|---|---|---|---|---|");
        for item in &report.storage {
            let _ = writeln!(
                s,
                "| {} | `{}` | {} | {} | {} |",
                item.kind,
                item.path.display(),
                item.count,
                crate::diagnostics::format_size(item.size_bytes),
                item.latest.as_deref().unwrap_or("—"),
            );
        }
    }

    s
}

/// Render a [`RecentActivityReport`] as Markdown.
pub fn render_recent(report: &RecentActivityReport) -> String {
    let mut s = String::new();
    let _ = writeln!(s, "# AgentSec — recent activity");
    let _ = writeln!(s);
    write_audit_section(&mut s, "paste_log", &report.paste);
    write_audit_section(&mut s, "web_log", &report.web);
    s
}

fn write_audit_section(s: &mut String, label: &str, rows: &[crate::diagnostics::AuditTail]) {
    let _ = writeln!(s, "## {label} ({} rows)", rows.len());
    let _ = writeln!(s);
    if rows.is_empty() {
        let _ = writeln!(s, "_empty._");
        let _ = writeln!(s);
        return;
    }
    for row in rows {
        let _ = writeln!(s, "### `{}` ({} bytes)", row.filename, row.size);
        let _ = writeln!(s);
        let _ = writeln!(s, "```");
        let _ = writeln!(s, "{}", row.excerpt);
        let _ = writeln!(s, "```");
        let _ = writeln!(s);
    }
}

/// Render a [`DoctorReport`] as Markdown.
pub fn render_doctor(report: &DoctorReport) -> String {
    let mut s = String::new();
    let _ = writeln!(s, "# AgentSec — doctor");
    let _ = writeln!(s);
    let mut pass = 0usize;
    let mut warn = 0usize;
    let mut fail = 0usize;
    for c in &report.checks {
        match c.status {
            DoctorStatus::Pass => pass += 1,
            DoctorStatus::Warn => warn += 1,
            DoctorStatus::Fail => fail += 1,
        }
    }
    let _ = writeln!(
        s,
        "Summary: **{pass} PASS / {warn} WARN / {fail} FAIL** ({} checks)",
        report.checks.len()
    );
    let _ = writeln!(s);
    let _ = writeln!(s, "| Status | Check | Detail |");
    let _ = writeln!(s, "|---|---|---|");
    for c in &report.checks {
        let badge = match c.status {
            DoctorStatus::Pass => "✅ PASS",
            DoctorStatus::Warn => "⚠️ WARN",
            DoctorStatus::Fail => "❌ FAIL",
        };
        let detail = c.message.replace('\n', " ").replace('|', "\\|");
        let _ = writeln!(s, "| {badge} | {} | {detail} |", c.name);
    }
    s
}

/// Short one-line diff summary for hook stderr output.
///
/// Format: `N added, M modified, K removed` (omits zero-count terms).
/// Returns `"no changes"` for an empty diff.
///
/// # Examples
///
/// ```
/// use agentsec_core::output::markdown::diff_summary_line;
/// use agentsec_core::scan::diff::DiffReport;
///
/// let empty = DiffReport { added: vec![], modified: vec![], removed: vec![] };
/// assert_eq!(diff_summary_line(&empty), "no changes");
/// ```
pub fn diff_summary_line(diff: &DiffReport) -> String {
    if diff.is_empty() {
        return "no changes".to_string();
    }
    let mut parts = Vec::new();
    if !diff.added.is_empty() {
        parts.push(format!("{} added", diff.added.len()));
    }
    if !diff.modified.is_empty() {
        parts.push(format!("{} modified", diff.modified.len()));
    }
    if !diff.removed.is_empty() {
        parts.push(format!("{} removed", diff.removed.len()));
    }
    parts.join(", ")
}

fn write_footer(s: &mut String, outcome: &ScanOutcome) {
    let _ = writeln!(
        s,
        "_snapshot written to: `{}`_",
        outcome.snapshot_path.display()
    );
}