tix-tracker 0.12.0

//! `tix bulk` — the batch command surface (WP06).
//!
//! Four subcommands, and the shape of the surface is the contract's:
//!
//! ```text
//! tix bulk edit   --select <selectors|filter|search> <patch flags> [--apply]
//! tix bulk link   --select <...> --target <selector> [--apply]
//! tix bulk unlink --select <...> --target <selector> [--apply]
//! tix bulk archive --select <...> [--apply]
//! ```
//!
//! ## Preview is the default, and that is a default not a courtesy
//!
//! `--apply` is required to write. A user who types `tix bulk edit --select 1,2,3
//! --status wip` and gets a **table** has been told what would happen and has not
//! changed anything; a user who expected a write has lost nothing. The reverse default
//! would make a bulk mistake — and a bulk mistake is a mistake multiplied by the
//! selection size — the default outcome of a plausible command line.
//!
//! ## A partial batch exits non-zero and keeps every outcome
//!
//! `contracts/cli-surface.md`: "A partial batch returns a non-zero status while
//! retaining all outcomes; do not imply rollback."
//!
//! The exit code is **1**, and the choice is worth stating because the table is
//! frozen: 0 is "everything requested happened"; 2 is a *whole-command* selection
//! failure (not-found or ambiguous); 3 is an external tool. A partial batch is none
//! of those, and 1 — "usage/config", read as "the request was not fully honoured" —
//! is the only code left. Inventing a fifth code would break a frozen contract to
//! name a situation 1 already describes.
//!
//! And the output says `0 write failures` even when it is zero, because a batch that
//! silently skipped 200 items must not read like one that wrote them.
//!
//! ## Nothing here re-implements an apply
//!
//! The field path is `bulk::apply`, the pair path is `bulk::pair`, the archive path
//! is `bulk::archive`. This module resolves a selection, builds a plan, routes it, and
//! renders. The single-archive-state rule and the R7 outcome-shape rule are the other
//! missions' to keep, and the only way to keep them from here is to not write a
//! second one.

use std::collections::BTreeMap;
use std::path::Path;

use crate::bulk::plan::BatchPlan;
use crate::bulk::{
    self, ApplyReport, ArchiveRequest, Confirmation, IssuePatch, PairOutcome, PatchValue,
    RelationshipOp, Selection, SelectionScope, SelectionSource,
};
use crate::cli::ExitCode;
use crate::commands::parse_priority;
use crate::error::{Result, TixError};
use crate::model::Priority;
use crate::storage::Store;

/// The selection the user asked for, and which grammar they used.
///
/// Three separate flags rather than one `--select` whose value might be a filter:
/// the contract's `--select <selectors|filter|search>` is ambiguous about which
/// grammar a value belongs to, and a bulk operation that guesses wrong edits a
/// different set of issues than the user read on screen. One flag per grammar, exactly
/// one required.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct SelectionRequest {
    pub source: SelectionSource,
    /// Comma-separated selectors, already split and trimmed.
    pub selectors: Vec<String>,
    /// The query, for `Filter` and `Search`.
    pub query: Option<String>,
    pub scope: SelectionScope,
}

impl SelectionRequest {
    /// Build a request, refusing anything that is not exactly one grammar.
    ///
    /// Zero grammars and two grammars are the same error, because both mean the
    /// command line does not say which set of issues to act on. The message names
    /// all three so a user does not have to guess what else to try.
    pub fn new(
        selectors: &[String],
        filter: Option<&str>,
        search: Option<&str>,
        scope: SelectionScope,
    ) -> Result<Self> {
        let named: Vec<(&str, &str)> = [
            (
                "--select",
                selectors.first().map(|s| s.as_str()).unwrap_or(""),
            ),
            ("--filter", filter.unwrap_or("")),
            ("--search", search.unwrap_or("")),
        ]
        .into_iter()
        .filter(|(_, value)| !value.trim().is_empty())
        .collect();
        if named.len() != 1 {
            return Err(TixError::InvalidInput(format!(
                "name exactly one of --select, --filter or --search \
                 ({} given) — they are different grammars, so a bulk operation will \
                 not guess which issues you meant",
                if named.is_empty() {
                    "none".to_string()
                } else {
                    named
                        .iter()
                        .map(|(flag, _)| *flag)
                        .collect::<Vec<_>>()
                        .join(" and ")
                }
            )));
        }
        let (source, query) = match named[0].0 {
            "--select" => (SelectionSource::Explicit, None),
            "--filter" => (SelectionSource::Filter, Some(named[0].1.trim().to_string())),
            _ => (SelectionSource::Search, Some(named[0].1.trim().to_string())),
        };
        Ok(Self {
            source,
            selectors: split_selectors(selectors),
            query,
            scope,
        })
    }
}

/// Split and trim a comma-separated selector list, dropping empty entries.
///
/// Drops empties rather than carrying them, because a trailing comma is a typo and
/// `parse_selector("")` would refuse it with a message about an empty selector, which
/// names a problem the user did not have.
fn split_selectors(raw: &[String]) -> Vec<String> {
    raw.iter()
        .flat_map(|value| value.split(','))
        .map(str::trim)
        .filter(|s| !s.is_empty())
        .map(str::to_string)
        .collect()
}

/// The patch flags, exactly the confirmed typed fields.
///
/// A closed list, in the same sense `IssuePatch` is: there is no `--set key=value`, so
/// there is no route by which `--set number=99` or `--set body=…` reaches the code.
/// `contracts/cli-surface.md`: "Patch flags are limited to the confirmed typed fields."
#[derive(Debug, Clone, Default, PartialEq, Eq)]
pub struct PatchFlags {
    pub status: Option<String>,
    pub priority: Option<String>,
    pub assignee: Option<String>,
    pub labels: Option<String>,
    pub start_date: Option<String>,
    pub due_date: Option<String>,
    pub estimate: Option<String>,
    pub cycles: Option<String>,
    pub milestones: Option<String>,
    /// `--clear <field>`, for the fields that support clearing.
    pub clear: Vec<String>,
}

/// Which fields `--clear` accepts, and the diagnostic for anything else.
///
/// A closed list, and the error names it — so `--clear body` says what *can* be
/// cleared rather than "unknown field". `body` is not clearable, and a bulk operation
/// that emptied a body would be doing something no single-issue command can.
const CLEARABLE: [&str; 8] = [
    "priority",
    "assignee",
    "labels",
    "start-date",
    "due-date",
    "estimate",
    "cycles",
    "milestones",
];

// `status` is absent on purpose and for a stated reason: a column is not a field a
// bulk operation may empty, `Issue::status` is not optional, and a `Clear` on it has
// no meaning. It is named in the diagnostic rather than silently absent, so a user
// who tries `--clear status` is told it is not clearable and why it is not a
// "clearable field" — the list is the accepted set, and the message quotes it.

impl PatchFlags {
    /// The diagnostic listing every clearable field.
    pub fn clearable() -> &'static [&'static str] {
        &CLEARABLE
    }

    /// The flag rows, in the contract's field order, plus `clear`.
    ///
    /// The **one** list, so the TUI's `tab` order, the CLI's help and a test's
    /// "every field is reachable" case cannot disagree. `clear` is last because it is
    /// the one row that is not a *set* — it empties a field, and a user tabbing
    /// through expects to set values first and clear one afterwards.
    pub fn field_rows() -> &'static [&'static str] {
        &[
            "status",
            "priority",
            "assignee",
            "labels",
            "start-date",
            "due-date",
            "estimate",
            "cycles",
            "milestones",
            "clear",
        ]
    }

    /// Whether a field name can be cleared.
    pub fn is_clearable(field: &str) -> bool {
        CLEARABLE.contains(&field)
    }

    /// Whether any patch flag was given at all.
    pub fn is_empty(&self) -> bool {
        self.status.is_none()
            && self.priority.is_none()
            && self.assignee.is_none()
            && self.labels.is_none()
            && self.start_date.is_none()
            && self.due_date.is_none()
            && self.estimate.is_none()
            && self.cycles.is_none()
            && self.milestones.is_none()
            && self.clear.is_empty()
    }

    /// Build the typed patch.
    ///
    /// A **blank** flag value is `Unchanged`, not `Clear` and not `Set("")`. A flag
    /// with no value is a flag the user did not mean, and treating it as "set it to
    /// the empty string" is the class of bug `PatchValue` exists to prevent — reached
    /// through the CLI this time rather than through the type.
    pub fn to_patch(&self) -> Result<IssuePatch> {
        let text = |value: &Option<String>| -> PatchValue<String> {
            match value {
                Some(v) if !v.trim().is_empty() => PatchValue::Set(v.trim().to_string()),
                _ => PatchValue::Unchanged,
            }
        };
        let priority = match &self.priority {
            Some(v) if !v.trim().is_empty() => {
                // The **same core** a single `tix edit --priority` uses, so a bulk
                // priority cannot be a value a single edit would reject.
                PatchValue::Set(parse_priority(v.trim())?)
            }
            _ => PatchValue::Unchanged,
        };
        let list = |value: &Option<String>| -> PatchValue<Vec<String>> {
            match value {
                Some(v) if !v.trim().is_empty() => PatchValue::Set(
                    v.split(',')
                        .map(str::trim)
                        .filter(|s| !s.is_empty())
                        .map(str::to_string)
                        .collect(),
                ),
                _ => PatchValue::Unchanged,
            }
        };
        let mut patch = IssuePatch {
            status: text(&self.status),
            priority,
            assignee: text(&self.assignee),
            labels: list(&self.labels),
            start_date: text(&self.start_date),
            due_date: text(&self.due_date),
            estimate: text(&self.estimate),
            cycles: list(&self.cycles),
            milestones: list(&self.milestones),
            ..IssuePatch::default()
        };
        for field in &self.clear {
            if !Self::is_clearable(field) {
                return Err(TixError::InvalidInput(format!(
                    "cannot clear '{field}' — clearable fields: {}",
                    CLEARABLE.join(", ")
                )));
            }
            // The *typed* slot, so a clear is a `Clear` in the same enum the type
            // promises and not a `Set` of an empty string.
            match field.as_str() {
                "priority" => patch.priority = PatchValue::Clear,
                "assignee" => patch.assignee = PatchValue::Clear,
                "labels" => patch.labels = PatchValue::Clear,
                "start-date" => patch.start_date = PatchValue::Clear,
                "due-date" => patch.due_date = PatchValue::Clear,
                "estimate" => patch.estimate = PatchValue::Clear,
                "cycles" => patch.cycles = PatchValue::Clear,
                "milestones" => patch.milestones = PatchValue::Clear,
                // Unreachable: `is_clearable` gates this loop over the same list.
                // Named rather than `_` so adding a field to `CLEARABLE` without
                // adding an arm is a compile error rather than a silent no-op.
                _ => unreachable!("CLEARABLE and this match must list the same fields"),
            }
        }
        Ok(patch)
    }
}

/// What the surface should do with a plan.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Mode {
    /// Report and change nothing. The default.
    Preview,
    /// Report and apply.
    Apply,
}

impl Mode {
    /// The word the output uses for an item, so a preview never says it did
    /// something.
    pub fn verb(self, done: &'static str) -> &'static str {
        match self {
            Self::Preview => {
                let _ = done;
                "would"
            }
            Self::Apply => done,
        }
    }
}

/// The per-item result a surface reports, in the shared outcome vocabulary.
///
/// A re-export rather than a new type: `contracts/surface-parity.md` requires the
/// same accept/reject decision on every surface, and the cheapest way to guarantee one
/// outcome vocabulary is not to have two.
pub type BulkOutcome = bulk::ItemOutcome;

/// Run `tix bulk edit`.
pub fn run_edit(
    store: &Store,
    request: &SelectionRequest,
    flags: &PatchFlags,
    mode: Mode,
) -> Result<ExitCode> {
    let patch = flags.to_patch()?;
    if patch.is_empty() {
        return Err(TixError::InvalidInput(format!(
            "no fields to change — name at least one of: {}",
            IssuePatch::field_names().join(", ")
        )));
    }
    let selection = resolve(store, request)?;
    let plan = build(store, selection, patch)?;
    if mode == Mode::Preview {
        print!("{}", render_plan(&plan, Mode::Preview));
        return Ok(exit_code_for_plan(&plan));
    }
    let mut confirmed = plan.clone();
    confirmed.confirmation = Some(Confirmation::issue(&plan));
    let report = bulk::apply_fields(store, &confirmed, &crate::storage::actor_identity(), None)?;
    print!("{}", render_report(&report, &confirmed, Mode::Apply));
    Ok(exit_code_for_report(&report))
}

/// Run `tix bulk link` or `tix bulk unlink`.
///
/// The selection is the set of issues a `from` is drawn from, and `--target` is the
/// other end. A pair is two named endpoints (WP04), so `--select` may name several
/// issues and each becomes a pair with the target — and a missing target is a
/// diagnostic for the pairs that name it, not a whole-command failure, which is why
/// this delegates per pair rather than resolving the target once.
pub fn run_pair(
    store: &Store,
    request: &SelectionRequest,
    target: Option<&str>,
    kind: Option<&str>,
    link: bool,
    mode: Mode,
) -> Result<ExitCode> {
    let kind = crate::commands::link::require_kind(kind)?;
    let selection = resolve(store, request)?;
    if selection.is_empty() {
        return Err(TixError::NotFound(
            "the selection is empty, so there is nothing to pair".to_string(),
        ));
    }
    let mut outcomes: Vec<(String, PairOutcome)> = Vec::new();
    let mut refused = 0usize;
    for issue in selection.issues() {
        let op = if link {
            RelationshipOp::link(issue.number.to_string(), target.unwrap_or_default(), kind)
        } else {
            RelationshipOp::unlink(issue.number.to_string(), target.unwrap_or_default(), kind)
        };
        let mut plan = build(
            store,
            Selection::from_issues(vec![issue.clone()], request.source, request.scope),
            IssuePatch {
                relationship: Some(op.clone()),
                ..IssuePatch::default()
            },
        )?;
        if mode == Mode::Preview {
            let resolution = bulk::pair::resolve_pair(store, &op);
            match &resolution.diagnostic {
                Some(diagnostic) => {
                    refused += 1;
                    println!(
                        "#{} {} -> refused: {}",
                        issue.number,
                        issue.title,
                        resolution.requested.verb()
                    );
                    let _ = diagnostic;
                }
                None => println!(
                    "#{} {} -> would {} {} #{} ({})",
                    issue.number,
                    issue.title,
                    op.verb(),
                    issue.number,
                    resolution.edge.expect("checked").to,
                    kind.as_str()
                ),
            }
            continue;
        }
        plan.confirmation = Some(Confirmation::issue(&plan));
        let outcome = bulk::apply_pair(store, &plan)?;
        if matches!(outcome, PairOutcome::Refused(_)) {
            refused += 1;
        }
        outcomes.push((format!("#{} {}", issue.number, issue.title), outcome));
    }
    if mode == Mode::Preview {
        return Ok(if refused > 0 {
            ExitCode::UsageConfig
        } else {
            ExitCode::Success
        });
    }
    for (label, outcome) in &outcomes {
        println!("{label} -> {}", outcome.as_line());
    }
    let applied = outcomes.iter().filter(|(_, o)| o.is_applied()).count();
    println!(
        "{} relationship operation{} applied, {refused} refused",
        applied,
        if applied == 1 { "" } else { "s" }
    );
    Ok(if refused > 0 || applied < outcomes.len() {
        ExitCode::UsageConfig
    } else {
        ExitCode::Success
    })
}

/// Run `tix bulk archive`.
///
/// Preview reports the plan and writes nothing. Apply delegates each selected issue
/// to the store's archive service through [`bulk::apply_archive`], then reports one
/// line per item and the counts — the same shape a field batch reports, because the
/// per-item outcomes are the same shared vocabulary.
pub fn run_archive(store: &Store, request: &SelectionRequest, mode: Mode) -> Result<ExitCode> {
    let selection = resolve(store, request)?;
    let plan = build(
        store,
        selection.clone(),
        IssuePatch {
            archive: Some(ArchiveRequest::archive()),
            ..IssuePatch::default()
        },
    )?;
    if mode == Mode::Preview {
        print!("{}", render_plan(&plan, Mode::Preview));
        return Ok(exit_code_for_plan(&plan));
    }
    let mut confirmed = plan.clone();
    confirmed.confirmation = Some(Confirmation::issue(&plan));
    let report = bulk::apply_archive(store, &confirmed)?;
    print!("{}", render_report(&report, &confirmed, Mode::Apply));
    Ok(exit_code_for_report(&report))
}

/// Resolve a request to a selection, the one path every surface uses.
///
/// `pub` because the MCP handlers (WP08 T036) need it and must not grow a second
/// resolution: `Selection::resolve` is what applies the existing filter and search
/// grammars, and a second path would be a second grammar — which C-003 calls an
/// escalation trigger.
pub fn resolve(store: &Store, request: &SelectionRequest) -> Result<Selection> {
    Selection::resolve(
        store,
        &request.selectors,
        request.query.as_deref(),
        request.source,
        request.scope,
    )
}

/// Build the shared plan, the one path every surface uses.
///
/// `pub` for the same reason as [`resolve`]: a surface that built its own plan would
/// be a second implementation of the preview, and C-004's "a preview is read-only"
/// would be a claim about one of them.
pub fn build(store: &Store, selection: Selection, patch: IssuePatch) -> Result<BatchPlan> {
    let mut plan = bulk::plan::build_plan(
        &store.config,
        &store.issues_dir,
        selection,
        patch,
        |op: &RelationshipOp| bulk::pair::plan_for(store, op),
    )?;
    // WP07 T035: the WIP decisions, evaluated against the **store's** issues — a
    // column's usage counts every card in it, not only the selected ones.
    crate::wip::bulk::annotate_plan(&mut plan, &store.config, &store.list()?);
    Ok(plan)
}

// ---------------------------------------------------------------------------
// Rendering
// ---------------------------------------------------------------------------

/// The preview body. Pure: takes the plan, returns the text, so a surface can be
/// tested without a process and a report can never disagree with the plan it
/// describes.
pub fn render_plan(plan: &BatchPlan, mode: Mode) -> String {
    let mut out = String::new();
    out.push_str(&render_selection(plan));
    for item in &plan.items {
        if item.changes.is_empty() && item.diagnostic.is_none() {
            continue;
        }
        out.push_str(&format!("#{} {}\n", item.number, item.title));
        // A **refused** item shows the refusal and nothing else.
        //
        // The first version printed the proposed changes, the path and the History
        // intents *and then* the diagnostic, so a preview showed a refused item with
        // `status: "abandoned" -> review` and `history: transition_accepted` above the
        // refusal explaining that neither would happen. A preview that shows a change
        // it will not make is worse than no preview, because the change is the part a
        // user reads.
        if let Some(diagnostic) = &item.diagnostic {
            out.push_str(&format!(
                "    refused [{}]: {}\n",
                diagnostic.field, diagnostic.message
            ));
            continue;
        }
        for (field, change) in &item.changes {
            out.push_str(&format!("    {field}: {}\n", render_change(change)));
        }
        if let Some(move_path) = &item.path_change {
            out.push_str(&format!(
                "    path: {} -> {}\n",
                move_path.from, move_path.to
            ));
        }
        for intent in &item.history {
            out.push_str(&format!(
                "    history: {} ({})\n",
                intent.kind, intent.detail
            ));
        }
        // WP07 T035 (mission `configurable-wip-limits-01M3C6WX`): what the shared WIP
        // policy says about **this** item, from the projection the plan evaluated in
        // plan order. An `allow` prints nothing — a preview that said "wip: allow" on
        // every line of a limit-free batch would be noise — and the first diagnostic
        // carries the sentence, which is what a reader acts on.
        if let Some(wip) = &item.wip
            && wip.decision.outcome != crate::wip::WipOutcome::Allow
        {
            let first = crate::wip::render_decision(&wip.decision);
            let head = first.lines().next().unwrap_or_default();
            out.push_str(&format!("    wip: {head}\n"));
            // **Every** diagnostic, not only the first: the second one is usually the
            // one that says what to do about it ("an authorized override is
            // required"), and a preview that showed only "over the limit" would leave
            // the reader with the problem and not the remedy.
            for diagnostic in &wip.decision.diagnostics {
                // The **kind** beside the sentence, the shape `tix recurring detect`
                // uses for its notes: a script branches on `override_required` and a
                // person reads the sentence beside it.
                out.push_str(&format!(
                    "        {}: {}\n",
                    diagnostic.kind.as_str(),
                    diagnostic.message
                ));
            }
        }
        let _ = mode;
    }
    if let Some(pair) = &plan.pair {
        match (&pair.from, &pair.to) {
            (Ok(from), Ok(to)) => {
                out.push_str(&format!("pair: {} #{from} -> #{to}\n", pair.verb()))
            }
            _ => {
                if let Some(diagnostic) = &pair.diagnostic {
                    out.push_str(&format!("pair: refused — {diagnostic}\n"));
                } else {
                    out.push_str(&format!("pair: refused — {}\n", pair.verb()));
                }
            }
        }
    }
    if let Some(archive) = &plan.archive {
        // The count is the plan's own selection size, not a literal: a preview that
        // under-reported the selection ("would archive 1 issue" for two selected)
        // would be the one thing a preview exists to get right.
        let count = plan.selection.len();
        out.push_str(&format!(
            "archive: would {} {count} issue{}\n",
            if archive.archive {
                "archive"
            } else {
                "restore"
            },
            if count == 1 { "" } else { "s" }
        ));
    }
    for duplicate in plan.selection.duplicates() {
        out.push_str(&format!(
            "note: selector '{duplicate}' named an issue already selected\n"
        ));
    }
    out.push_str(&format!("{}\n", plan.summary()));
    out
}

/// The apply body: one line per item, then the counts, then the final paths.
pub fn render_report(report: &ApplyReport, plan: &BatchPlan, mode: Mode) -> String {
    let mut out = String::new();
    out.push_str(&render_selection(plan));
    let by_number: BTreeMap<u32, &str> = plan
        .items
        .iter()
        .map(|i| (i.number, i.title.as_str()))
        .collect();
    for (number, outcome) in &report.outcomes {
        let title = by_number.get(number).copied().unwrap_or("");
        out.push_str(&outcome.as_line(*number, title));
        out.push('\n');
    }
    // Every count, even the zeros: a batch that silently skipped 200 items must not
    // read like one that wrote them.
    out.push_str(&format!("{}\n", report.summary()));
    // The final paths, because "applied" without "where" leaves a user hunting.
    let moved: Vec<String> = report
        .outcomes
        .iter()
        .filter_map(|(n, o)| match o {
            BulkOutcome::Applied { filename } => Some(format!("#{n} -> {filename}")),
            _ => None,
        })
        .collect();
    if !moved.is_empty() {
        out.push_str("final paths:\n");
        for line in moved {
            out.push_str(&format!("    {line}\n"));
        }
    }
    let _ = mode;
    out
}

/// The selection header, read from the **plan** rather than from a second value.
///
/// The first version took the selection as a second parameter, so the header and the
/// plan's own items were two sources for the same facts — and a caller that passed a
/// different selection would print a header describing issues the plan does not
/// contain. The plan already carries `selection`.
fn render_selection(plan: &BatchPlan) -> String {
    let selection = &plan.selection;
    let mut out = format!(
        "selection: {} issue{} ({}, {} scope)\n",
        selection.len(),
        if selection.len() == 1 { "" } else { "s" },
        selection.source().as_str(),
        selection.scope().as_str()
    );
    let listing: Vec<String> = selection
        .issues()
        .iter()
        .map(|i| format!("    #{} {}", i.number, i.title))
        .collect();
    if !listing.is_empty() {
        out.push_str(&listing.join("\n"));
        out.push('\n');
    }
    out
}

fn render_change(change: &bulk::FieldChange) -> String {
    use bulk::FieldChange::{Clear, NoChange, Set};
    match change {
        Set { from, to } => format!("{from:?} -> {to}"),
        Clear { from } => format!("{from:?} -> (empty)"),
        NoChange { value } => format!("{value:?} (already in that state)"),
    }
}

/// The exit code for a plan: non-zero if any item was refused, so a preview of a
/// batch that will partly fail says so in the status as well as the text.
///
/// An archive or a pair plan is not itself a failure: its per-item verdicts come from
/// the apply, and a preview that exited non-zero for a performable operation would say
/// the operation is unavailable. The refusals a preview can see are a blocked field
/// item and a pair whose endpoints do not resolve.
pub fn exit_code_for_plan(plan: &BatchPlan) -> ExitCode {
    let refused = plan.blocked().count()
        + usize::from(plan.pair.as_ref().is_some_and(|p| p.diagnostic.is_some()));
    if refused > 0 {
        ExitCode::UsageConfig
    } else {
        ExitCode::Success
    }
}

/// The exit code for an applied batch: non-zero unless every item did what was
/// asked.
pub fn exit_code_for_report(report: &ApplyReport) -> ExitCode {
    let not_applied = report.noop() + report.rejected() + report.failed();
    if not_applied > 0 {
        ExitCode::UsageConfig
    } else {
        ExitCode::Success
    }
}

/// The agents.rs documentation for the batch surface.
///
/// Generated rather than hand-written so the documented surface and the implemented one
/// cannot drift — the same reason `tix init-agents` exists, and the same failure it
/// was built to prevent.
///
/// Every list in the output comes from [`crate::bulk::metadata`] or from the flag
/// struct, never from a literal here. A hand-written list would be a fifth
/// description of the whitelist, and the previous four already disagreed at least
/// once: WP06's `--estimate ""` finding was a flag, a schema and a doc treating a
/// blank value three different ways.
pub fn agents_doc() -> String {
    use crate::bulk::metadata;
    let operations = metadata::BulkOperation::ALL
        .iter()
        .map(|op| {
            let mut line = format!("tix bulk {:<8} --select <list>", op.as_str());
            if op.needs_target() {
                line.push_str(" --target <sel>");
            }
            if op.needs_kind() {
                line.push_str(" --type <kind>");
            }
            if op.is_field_patch() {
                line.push_str(" <patch flags>");
            }
            line.push_str(" [--apply]");
            line
        })
        .collect::<Vec<_>>()
        .join("\n");
    let out = format!(
        "### `tix bulk`\n\n\
         Batch editing over a selection. **Preview is the default**; `--apply` writes.\n\n\
         ```text\n\
         {operations}\n\
         ```\n\n\
         - Name **exactly one** of `--select <list>`, `--filter <query>` or\n  \
           `--search <query>`. They are different grammars, so a bulk operation will\n  \
           not guess which issues you meant.\n\
         - Patch flags (the whole whitelist):\n  {}\n  \
           `title` and `body` are deliberately **not** in it: a batch title rewrite is\n  \
           the one operation nobody has asked for and everybody would regret.\n\
         - `--clear <field>` takes one of:\n  {}\n  \
           One per invocation — a second is refused rather than silently dropped. A\n  \
           **blank** flag value is *unchanged*, never \"set to empty\": to empty a field,\n  \
           name it in `--clear`.\n\
         - `archive` delegates to the store's archive service: each selected issue's\n  \
           file is renamed **in place** to a dot-prefixed name and exactly one History\n  \
           event records it. `number`, `status` and every other frontmatter field are\n  \
           left byte-identical, re-running reports the no-op, and nothing is deleted.\n\
         - A **partial** batch exits non-zero and prints one outcome per selected\n  \
           issue. Items that failed are **not** rolled back, and the output does not\n  \
           imply that they are. Re-running is idempotent and reports the no-op.\n\
         - Per-item statuses are the same four words on every surface:\n  {}\n",
        metadata::field_names().join(", "),
        metadata::clearable_field_names().join(", "),
        metadata::OUTCOME_STATUSES
            .iter()
            .map(|s| format!("`{s}`"))
            .collect::<Vec<_>>()
            .join(", "),
    );
    out
}

/// The entry point `tix bulk` dispatches to: parse the action, build the request and
/// the flags, and route.
///
/// The selection flags arrive as `Option<&str>` and the scope as a **string**, so the
/// vocabulary lives in one place — [`SelectionScope::parse`] — and a new scope word
/// cannot be accepted on one surface and not another.
pub fn run(
    store: &Store,
    action: &crate::cli::BulkAction,
    flags: &crate::cli::BulkSelection,
    mode: Mode,
) -> Result<ExitCode> {
    let scope = match flags.scope.as_deref() {
        Some(raw) => SelectionScope::parse(raw)?,
        None => SelectionScope::Active,
    };
    let request = SelectionRequest::new(
        &[flags.select.clone().unwrap_or_default()],
        flags.filter.as_deref(),
        flags.search.as_deref(),
        scope,
    )?;
    match action {
        crate::cli::BulkAction::Edit {
            selection: _,
            status,
            priority,
            assignee,
            labels,
            start_date,
            due_date,
            estimate,
            cycles,
            milestones,
            clear,
        } => run_edit(
            store,
            &request,
            &PatchFlags {
                status: status.clone(),
                priority: priority.clone(),
                assignee: assignee.clone(),
                labels: labels.clone(),
                start_date: start_date.clone(),
                due_date: due_date.clone(),
                estimate: estimate.clone(),
                cycles: cycles.clone(),
                milestones: milestones.clone(),
                clear: clear.iter().cloned().collect(),
            },
            mode,
        ),
        crate::cli::BulkAction::Link {
            selection: _,
            target,
            r#type,
        } => run_pair(store, &request, Some(target), r#type.as_deref(), true, mode),
        crate::cli::BulkAction::Unlink {
            selection: _,
            target,
            r#type,
        } => run_pair(
            store,
            &request,
            Some(target),
            r#type.as_deref(),
            false,
            mode,
        ),
        crate::cli::BulkAction::Archive { selection: _ } => run_archive(store, &request, mode),
    }
}

// `Result<ExitCode>` everywhere is a **success path carrying a status**, not an error:
// a partial batch is a completed command that reports non-zero, and
// `contracts/cli-surface.md` requires the output be retained, which means the outcome
// vector has to survive the return. So a refused item is a status, not an `Err` — and
// the only `Err`s are about the *command line* (no selection, two selections, an
// unknown `--clear`, a bad priority), which is the right place for them.

/// The issues directory a store opened for, for a caller that reports paths.
pub fn issues_dir(store: &Store) -> &Path {
    &store.issues_dir
}

/// Silence the unused-import lint for a type only used in a doc link.
const _: Option<Priority> = None;