tix-tracker 0.12.0

//! Thin dispatch: route a parsed CLI [`Command`] to its per-command handler
//! module. Also owns the shared `<issue>` selector resolution and priority
//! validation that several commands reuse.
//!
//! Selector precedence follows `contracts/cli.md` §Selection grammar: a bare
//! number wins, then a unique filename fragment, then a title fragment that
//! matches exactly one issue. Non-unique matches are a hard error listing
//! the candidates (exit 2 like target-not-found, per the exit-code table).

use std::collections::HashSet;
use std::path::Path;

use crate::cli::Command;
use crate::config::Config;
use crate::error::{Result, TixError};
use crate::model::Priority;
use crate::storage::{IssueSelector, Store};

pub mod agents;
pub mod analytics;
pub mod archive;
pub mod beads;
pub mod bulk;
pub mod capacity;
pub mod clean;
pub mod create;
pub mod cycle;
pub mod delete;
pub mod edit;
pub mod epic;
pub mod export;
pub mod health;
pub mod import;
pub mod init;
pub mod layout;
pub mod link;
pub mod lint;
pub mod list;
pub mod mentions;
pub mod migrate;
pub mod milestone;
pub mod mv;
pub mod parent;
pub mod project;
pub mod recurring;
pub mod render;
pub mod roadmap;
pub mod rollover;
pub mod search;
pub mod status;
pub mod templates;
pub mod time;
pub mod triage;
pub mod version;
pub mod view;
pub mod views;
pub mod wip;
pub mod workflow;

/// Message prefix shared with `cli::exit_code_for` so selection ambiguity is
/// routed to the `2` exit bucket alongside target-not-found.
pub const AMBIGUITY_PREFIX: &str = "ambiguous selector";

/// Insert or replace a marker-delimited managed block in `existing`.
///
/// Shared by `tix init-agents` (`AGENTS.md`, `<!-- tix:start -->` /
/// `<!-- tix:end -->`) and `tix init` (`.gitignore`, `# tix:start` / `# tix:end`)
/// so the two never drift into two block formats:
///
/// - both markers found → replace everything between them, inclusive;
/// - an already byte-identical block (ignoring surrounding whitespace) → return
///   `existing` unchanged, so re-runs are fully idempotent;
/// - only one marker → treat the file as unrelated and append a fresh block;
/// - no markers → append a fresh block.
pub fn upsert_block(existing: &str, block: &str, start_marker: &str, end_marker: &str) -> String {
    let has_start = existing.contains(start_marker);
    let has_end = existing.contains(end_marker);

    match (has_start, has_end) {
        (true, true) => {
            let start = existing.find(start_marker).unwrap();
            let end = existing.find(end_marker).unwrap() + end_marker.len();
            if existing[start..end].trim() == block.trim() {
                return existing.to_string();
            }
            format!("{}{}{}", &existing[..start], block, &existing[end..])
        }
        (true, false) | (false, true) => {
            format!("{}\n{}\n", existing.trim_end(), block)
        }
        (false, false) => {
            let trimmed = existing.trim_end();
            if trimmed.is_empty() {
                format!("{block}\n")
            } else {
                format!("{trimmed}\n\n{block}\n")
            }
        }
    }
}

/// Atomic file write: write `content` to a sibling temp file, then rename it
/// over `path`, so a crash mid-write cannot leave a truncated file.
pub fn atomic_write(path: &Path, content: &str) -> Result<()> {
    let parent = path.parent().unwrap_or_else(|| Path::new("."));
    let file_name = path.file_name().map_or_else(
        || ".tix-tmp".to_string(),
        |name| format!(".{}.tix-tmp", name.to_string_lossy()),
    );
    let tmp = parent.join(file_name);
    std::fs::write(&tmp, content)?;
    std::fs::rename(&tmp, path)?;
    Ok(())
}

// ---------------------------------------------------------------------------
// Shared project refusals (WP09 item E)
// ---------------------------------------------------------------------------
//
// Three user-facing refusals are spelled in both the CLI and MCP. Each predicate
// and its message live here, in one place, and both sides call them, so a
// rewording cannot leave one surface saying something the other does not. This is
// the same discipline `projects::ProjectError` follows for the service refusals;
// these three are *command-level* rules the service never sees.

/// The refusal `tix project edit` prints when no field flag was given.
///
/// `--projects` is not one of the edit flags — it belongs to `tix edit` — so a
/// caller with no field change has asked for nothing and is told which flags
/// exist rather than silently rewriting the record.
pub fn project_edit_requires_a_field() -> TixError {
    TixError::InvalidInput(
        "no fields to change; pass at least one of --name, --description, --status, \
         --lead, --start-date or --due-date"
            .to_string(),
    )
}

/// Whether a `--projects` value on `tix edit` is the **clear-everything**
/// spelling (blank after trimming), per the empty-string-clears convention.
pub fn edit_projects_clears(value: &str) -> bool {
    value.trim().is_empty()
}

/// The refusal for a non-blank `--projects` on `tix edit`.
///
/// Setting associations has exactly one spelling (`--add-project` /
/// `--remove-project`); a non-blank list here is refused rather than guessed at,
/// so a typo cannot silently replace an association set.
pub fn edit_projects_must_be_clear(value: &str) -> TixError {
    TixError::InvalidInput(format!(
        "--projects on `tix edit` only clears associations (`--projects \"\"`); use \
         --add-project / --remove-project to change them, not `--projects {value}`"
    ))
}

/// The refusal for `--projects` beside `--template`.
///
/// Returns `Some` only for a non-blank value; an omitted or blank `--projects`
/// narrows nothing and is allowed. Refused rather than dropped: silently ignoring
/// it would create an issue the caller believes is associated, and the template
/// surface (source issue #174) owns wiring the field through its own crate.
pub fn projects_beside_template_refused(projects: Option<&str>) -> Option<TixError> {
    projects.filter(|value| !value.trim().is_empty()).map(|_| {
        TixError::InvalidInput(
            "--projects cannot be combined with --template yet; create without \
                 the template and add the association with `tix project add`"
                .to_string(),
        )
    })
}

/// Whether an `--epics` value on `tix edit` is the **clear-everything** spelling
/// (blank after trimming), per the empty-string-clears convention.
pub fn edit_epics_clears(value: &str) -> bool {
    value.trim().is_empty()
}

/// The refusal for a non-blank `--epics` on `tix edit`.
///
/// Setting references has exactly one spelling (`--add-epic` / `--remove-epic`);
/// a non-blank list here is refused rather than guessed at, so a typo cannot
/// silently replace a reference set.
pub fn edit_epics_must_be_clear(value: &str) -> TixError {
    TixError::InvalidInput(format!(
        "--epics on `tix edit` only clears references (`--epics \"\"`); use \
         --add-epic / --remove-epic to change them, not `--epics {value}`"
    ))
}

/// The refusal for `--epics` beside `--template`.
///
/// Mirrors [`projects_beside_template_refused`] and is refused rather than dropped
/// for the same reason: silently ignoring it would create an issue the caller
/// believes references the epic, and the template surface (source issue #174) owns
/// wiring the field through its own crate.
pub fn epics_beside_template_refused(epics: Option<&str>) -> Option<TixError> {
    epics.filter(|value| !value.trim().is_empty()).map(|_| {
        TixError::InvalidInput(
            "--epics cannot be combined with --template yet; create without \
                 the template and add the reference with `tix epic add`"
                .to_string(),
        )
    })
}

/// One argument per `tix.toml`-backed field; the flag count mirrors the
/// frozen command surface in `contracts/cli.md`.
#[allow(clippy::too_many_arguments)]
/// The data-level action for one `tix mentions` verb.
///
/// A projection, not a second definition: the enum in `cli.rs` is the flag grammar
/// and this module owns the behavior, so the two cannot drift into a verb that parses
/// and does nothing.
fn mentions_action(action: &crate::cli::MentionsAction) -> mentions::Action<'_> {
    use crate::cli::MentionsAction as Cli;
    match action {
        Cli::List => mentions::Action::List,
        Cli::Show { id } => mentions::Action::Show(id),
        Cli::Read { id } => mentions::Action::Read(id),
        Cli::Ignore { id } => mentions::Action::Ignore(id),
        Cli::Jump { id } => mentions::Action::Jump(id),
    }
}

#[allow(clippy::too_many_lines)]
pub fn dispatch(cmd: &Command, config: &Config, store: &Store) -> Result<()> {
    match cmd {
        Command::Init { beads: _ } => unreachable!("init is handled before dispatch"),
        Command::InitAgents { yes: _ } => unreachable!("init-agents is handled before dispatch"),
        Command::Triage { .. } => unreachable!("triage is handled before dispatch"),
        Command::Version => unreachable!("version is handled before dispatch"),
        // `tix beads` reaches the `bd` CLI, writes its own state file and refuses
        // writes under `mirror`, so it is routed in `cli::run` where the exit code
        // is decided — the same boundary `triage` and `bulk` use.
        Command::Beads { .. } => unreachable!("beads is handled before dispatch"),
        // `tix mentions` reads and writes only the mention store, so it fits
        // `dispatch`'s `&Config` borrow. Its verbs carry no batch status: one mention
        // is one record, and an unknown id is a plain `not found`.
        Command::Mentions { action } => mentions::run(store, &mentions_action(action)),
        // `tix analytics` is read-only over the shared series/projection DTOs and the
        // chart document WP04 owns, so it fits `dispatch`'s `&Config` borrow. Its
        // `burndown`/`projection` verbs print and write nothing at all; its `export`
        // verb writes only the caller's own `--output` path, and never an issue, a
        // cycle, a milestone or a snapshot.
        Command::Analytics { command } => analytics::run(config, store, command),
        Command::Health { action } => health::run(config, store, action),
        // `tix roadmap` is read-only, so it fits `dispatch`'s `&Config` borrow and is
        // routed here. `tix initiative` mutates `tix.toml` and so is routed by
        // `cli::run`, where the mutable config is owned — the arm is here anyway so
        // the match stays exhaustive and a caller reaching `dispatch` with one is
        // told why rather than being quietly dropped.
        Command::Roadmap { command } => roadmap::run_roadmap(config, store, command).map(|_| ()),
        Command::Initiative { .. } => unreachable!("initiative is handled before dispatch"),
        Command::Mcp => unreachable!("mcp is handled before dispatch"),
        Command::New => unreachable!("new is handled before dispatch"),
        Command::Create {
            title,
            body,
            status,
            priority,
            assignee,
            labels,
            files,
            estimate,
            cycles,
            milestones,
            projects,
            epics,
            reviewer,
            start_date,
            due_date,
            parent,
            related_issues,
            r#type,
            template,
            scope,
        } => {
            // One branch, and the no-template branch is the untouched
            // `create::run` call: `tix create` without `--template` behaves
            // exactly as before (byte-identical output and files). `--scope`
            // cannot reach the else branch with a value — clap requires
            // `--template` when `--scope` is present.
            if let Some(template_id) = template {
                // `--projects` is deliberately refused beside `--template` rather
                // than dropped: silently ignoring it would create an issue the user
                // believes is associated, and the template surface (source issue
                // #174) owns wiring the field through its own crate. The predicate
                // and wording live in one shared helper so MCP cannot diverge.
                if let Some(error) = projects_beside_template_refused(projects.as_deref()) {
                    return Err(error);
                }
                if let Some(error) = epics_beside_template_refused(epics.as_deref()) {
                    return Err(error);
                }
                templates::create_from_template(
                    config,
                    store,
                    template_id,
                    scope.as_deref(),
                    &templates::CreateFields {
                        title: title.as_deref(),
                        body: body.as_deref(),
                        status: status.as_deref(),
                        priority: priority.as_deref(),
                        assignee: assignee.as_deref(),
                        labels: labels.as_deref(),
                        files: files.as_deref(),
                        estimate: estimate.as_deref(),
                        cycles: cycles.as_deref(),
                        milestones: milestones.as_deref(),
                        reviewer: reviewer.as_deref(),
                        start_date: start_date.as_deref(),
                        due_date: due_date.as_deref(),
                        parent: parent.as_deref(),
                        related_issues: related_issues.as_deref(),
                        type_: r#type.as_deref(),
                    },
                )
            } else {
                create::run(
                    config,
                    store,
                    title.as_deref(),
                    body.as_deref(),
                    status.as_deref(),
                    priority.as_deref(),
                    assignee.as_deref(),
                    labels.as_deref(),
                    files.as_deref(),
                    estimate.as_deref(),
                    cycles.as_deref(),
                    milestones.as_deref(),
                    projects.as_deref(),
                    epics.as_deref(),
                    reviewer.as_deref(),
                    start_date.as_deref(),
                    due_date.as_deref(),
                    parent.as_deref(),
                    related_issues.as_deref(),
                    r#type.as_deref(),
                )
            }
        }
        Command::Parent { action } => parent::run(store, action),
        Command::Link {
            action,
            from,
            to,
            r#type,
        } => link::run(
            store,
            action.as_ref(),
            from.as_deref(),
            to.as_deref(),
            r#type.as_deref(),
        ),
        Command::Unlink { from, to, r#type } => {
            link::unlink_cli(store, from, to, r#type.as_deref())
        }
        Command::Chain { issue } => link::chain(store, issue),
        // Routed by `cli::run`, not here: a bulk batch's exit code is a **result**,
        // and every other arm of this match is `Result<()>`. The arm is here so the
        // match stays exhaustive and so a caller that reaches `dispatch` with a bulk
        // command is told why rather than being quietly dropped.
        Command::Bulk { .. } => Err(TixError::InvalidInput(
            "`tix bulk` is routed by the process entry, not by dispatch — a partial \
             batch reports a non-zero status rather than an error"
                .to_string(),
        )),
        Command::Edit {
            issue,
            title,
            body,
            status,
            priority,
            assignee,
            labels,
            files,
            estimate,
            cycles,
            milestones,
            add_project,
            remove_project,
            projects,
            add_epic,
            remove_epic,
            epics,
            reviewer,
            parent,
            start_date,
            due_date,
            commit,
            reason,
            related_issues,
            r#type,
        } => edit::run(
            config,
            store,
            issue,
            title.as_deref(),
            body.as_deref(),
            status.as_deref(),
            priority.as_deref(),
            assignee.as_deref(),
            labels.as_deref(),
            files.as_deref(),
            estimate.as_deref(),
            cycles.as_deref(),
            milestones.as_deref(),
            add_project,
            remove_project,
            projects.as_deref(),
            add_epic,
            remove_epic,
            epics.as_deref(),
            reviewer.as_deref(),
            start_date.as_deref(),
            due_date.as_deref(),
            commit.as_deref(),
            parent.as_deref(),
            // `--reason` is not an editable field — it only qualifies a
            // `--status` transition — so it is kept out of the editable-field
            // ordering and `edit::run`'s "was any field supplied" check.
            reason.as_deref(),
            related_issues.as_deref(),
            r#type.as_deref(),
        ),
        Command::Move {
            args,
            select,
            filter,
            search,
            dry_run,
            commit,
            reason,
            yes,
            r#override,
        } => mv::run_batch(
            config,
            store,
            args,
            select.as_deref(),
            filter.as_deref(),
            search.as_deref(),
            commit.as_deref(),
            reason.as_deref(),
            *yes,
            *r#override,
            *dry_run,
        )
        // The binary routes `tix move` through `cli::run` so a partial batch's
        // exit status survives; dispatch cannot carry that status. Reaching this
        // arm means an in-process caller asked for the move and only wants
        // whether it ran at all, so the status is dropped here.
        .map(|_| ()),
        // `tix wip` mutates `tix.toml`, so it is routed by `cli::run_subcommand`,
        // which owns the mutable `Config` this dispatch cannot borrow. The arm is
        // here so the match stays exhaustive and a caller that reaches `dispatch`
        // with it is told why.
        // `tix project` mutates `tix.toml` (create/edit/delete) and carries a
        // partial-batch **status** for `add`/`remove`/`bulk-add`, so it is routed by
        // `cli::run`, which owns the mutable config and decides the exit code. The
        // arm is here so the match stays exhaustive and a caller that reaches
        // `dispatch` with it is told why.
        Command::Project { .. } => Err(TixError::InvalidInput(
            "`tix project` is routed by the process entry, not by dispatch".to_string(),
        )),
        // `tix epic` shares `tix project`'s routing reason: its lifecycle verbs
        // mutate `tix.toml` and its batch verbs carry a partial-batch status, so
        // `cli::run` owns both the mutable config and the exit code.
        Command::Epic { .. } => Err(TixError::InvalidInput(
            "`tix epic` is routed by the process entry, not by dispatch".to_string(),
        )),
        Command::Wip { .. } => Err(TixError::InvalidInput(
            "`tix wip` is routed by the process entry, not by dispatch".to_string(),
        )),
        Command::View {
            action,
            issue,
            show,
        } => match (action, issue) {
            // `tix view <subcommand>` is routed by `cli::run_subcommand`, which
            // owns the mutable `Config` a view mutation needs. The arm is here so
            // the match stays exhaustive and a caller that reaches `dispatch` with
            // a saved-view subcommand is told why rather than being quietly
            // treated as an issue selector.
            (Some(_), _) => Err(TixError::InvalidInput(
                "`tix view <subcommand>` is routed by the process entry, not by dispatch"
                    .to_string(),
            )),
            (None, Some(issue)) => view::run(store, issue, show.as_deref()),
            (None, None) => Err(TixError::InvalidInput(
                "`tix view` needs an issue selector or a subcommand; run `tix view --help`"
                    .to_string(),
            )),
        },
        Command::List {
            status,
            filter,
            project,
            epic,
            sort,
            group,
            columns,
            show,
            with_archived,
            all,
            format,
        } => list::run(
            store,
            status.as_deref(),
            filter.as_deref(),
            project.as_deref(),
            epic.as_deref(),
            sort.as_deref(),
            group.as_deref(),
            columns.as_deref(),
            show.as_deref(),
            *with_archived,
            *all,
            format.as_deref(),
            None,
        ),
        Command::Ready {
            columns,
            limit,
            project,
            epic,
            format,
        } => list::ready(
            store,
            columns.as_deref(),
            *limit,
            project.as_deref(),
            epic.as_deref(),
            format.as_deref(),
        ),
        Command::Workflow { action } => match action {
            crate::cli::WorkflowAction::Categories => workflow::categories(config),
            crate::cli::WorkflowAction::Show { board } => workflow::show(config, board.as_deref()),
            crate::cli::WorkflowAction::Transitions => workflow::transitions(config),
        },
        Command::Status {
            filter,
            sort,
            group,
            health,
            json,
        } => status::run(
            config,
            store,
            filter.as_deref(),
            sort.as_deref(),
            group.as_deref(),
            *health,
            *json,
        ),
        // `tix time` reads and writes the issue store only, so it fits this dispatch: a
        // mutation goes through the shared service, and none of the verbs needs the
        // mutable config the process entry owns or a partial-batch status.
        Command::Time { command } => time::run(store, command),
        Command::Delete { issue, yes } => delete::run(store, issue, *yes),
        // The recurrence surface: a thin adapter over `recurrence::{series,detect,
        // generate,lifecycle}`. `create` needs `&Config` (it goes through the shared
        // create core), which `dispatch` already borrows immutably.
        Command::Recurring { action } => recurring::run(config, store, action),
        // Routed by `cli::run`, not here: an archive/restore batch reports one
        // outcome per item and exits non-zero if any failed, which is a
        // *status* rather than a `Result<()>` (`contracts/cli-surface.md`, the
        // same shape `tix bulk` and `tix triage` use). The arms keep the match
        // exhaustive and tell a caller that reaches `dispatch` why.
        Command::Archive { .. } | Command::Restore { .. } => Err(TixError::InvalidInput(
            "`tix archive`/`tix restore` are routed by the process entry, not by dispatch — \
             a partial batch reports a non-zero status rather than an error"
                .to_string(),
        )),
        // Routed by `cli::run`, not here: management mutates `tix.toml` and so
        // needs a mutable config and the path it was read from, which
        // `dispatch`'s `&Config` cannot provide. The arm keeps the match
        // exhaustive and explains why rather than dropping the command.
        Command::Template { .. } => Err(TixError::InvalidInput(
            "`tix template` is routed by the process entry, not by dispatch — management \
             writes `tix.toml` through a mutable config"
                .to_string(),
        )),
        // The frozen legacy `tix cycle create|list|edit|delete` verbs route here,
        // exactly as before. Only the new `schedule` namespace mutates `tix.toml`
        // and is routed by `cli::run`; a schedule command can never reach this arm.
        Command::Cycle { command } => cycle::run_legacy(config, store, command),
        // Routed by `cli::run`, not here: `set`/`delete` mutate `tix.toml` and need the
        // mutable config only the process entry owns. The arm is here so the match
        // stays exhaustive and a caller that reaches `dispatch` with one is told why
        // rather than being quietly dropped.
        Command::Capacity { .. } => unreachable!("capacity is handled before dispatch"),
        Command::Milestone { command } => milestone::run(config, store, command),
        Command::Export {
            target,
            dry_run,
            project,
            cycle,
            output,
            verbose,
        } => export::run(
            config,
            store,
            target,
            *dry_run,
            project.as_deref(),
            cycle.as_deref(),
            output.as_deref(),
            *verbose,
        )
        .map(|_| ()),
        Command::Import {
            target,
            triage_policy,
        } => {
            // Target first, then the policy — the order WP07 froze (T036): a bad
            // `--target` must still report what an older `tix` reported and never
            // a triage diagnostic. `Tool::from_target` is the exact call
            // `run_core_with_policy` makes a line later, so this cannot accept a
            // target that one would reject; it only fixes which of two bad flags
            // is named first. `speckit` and `beads` are **local** readers rather
            // than remote `Tool`s — they shell out to no tracker API and hold no
            // token — so both are exempt here and validate themselves.
            if target != "speckit" && target != "beads" {
                crate::sync::Tool::from_target(target)?;
            }
            let policy = triage_policy
                .as_deref()
                .map(crate::triage::import_policy::ImportPolicy::parse)
                .transpose()?
                .unwrap_or_default();
            import::run_with_policy(config, store, target, policy)
        }
        Command::Rollover { cycle, yes } => rollover::run(config, store, cycle.as_deref(), *yes),
        Command::Search {
            string,
            with_archived,
        } => search::run(store, string, *with_archived),
        Command::Render => render::run(config, store),
        Command::Clean { force, keep } => clean::run(store, *force, *keep),
        Command::Lint { no_foreign } => lint::run_with(config, store, !no_foreign).map(|_| ()),
        Command::Layout { action } => layout::run(config, store, action),
        Command::Migrate { action } => migrate::run(store, action),
    }
}

/// The one sentence every surface uses to say an issue is blocked (FR-003,
/// FR-004).
///
/// `contracts/cli.md` and `contracts/surface-parity.md` §2 require the CLI
/// warning, the TUI warning, `tix list --show relationships`, and the detail view
/// to carry the **same** text, and the service's [`BlockedState::reason`] is the
/// only string that is allowed to produce it. Each surface composing its own
/// phrasing is how four surfaces come to say four different things about one
/// graph.
///
/// Returns `None` when the issue is not blocked, so a caller cannot accidentally
/// print an empty "blocked: " prefix.
pub fn blocked_note(state: &crate::relationships::BlockedState) -> Option<String> {
    if !state.is_blocked {
        return None;
    }
    Some(format!("blocked: {}", state.reason))
}

/// The issue set plus the board's configured completion column, with a
/// [`RelationshipGraph`] over the pair.
///
/// One place for every surface to obtain a graph (C-003, parity §3). A surface
/// that reached past the service to re-derive direction handling, cycle
/// detection, or blocked state would be the defect this contract exists to
/// prevent, and giving each surface its own graph construction is how that starts
/// to happen.
pub fn graph_over<'a>(
    issues: &'a [crate::model::Issue],
    done_column: &str,
) -> crate::relationships::RelationshipGraph<'a> {
    use crate::model::Issue;
    use crate::relationships::IssueView;
    let views: Vec<IssueView<'_>> = issues.iter().map(Issue::issue_view).collect();
    crate::relationships::RelationshipGraph::new(&views, done_column)
}

/// Resolve an `<issue>` selector string per `contracts/cli.md` §Selection
/// grammar (number → unique filename fragment → unique title fragment).
pub fn parse_selector(store: &Store, raw: &str) -> Result<IssueSelector> {
    if let Ok(number) = raw
        .trim()
        .strip_prefix('#')
        .unwrap_or(raw.trim())
        .parse::<u32>()
    {
        let matched: Vec<crate::model::Issue> = store
            .list_all()?
            .into_iter()
            .filter(|issue| issue.number == number)
            .collect();
        return match matched.as_slice() {
            [_] => Ok(IssueSelector::Number(number)),
            [] => Err(TixError::NotFound(format!("issue #{number}"))),
            many => Err(TixError::InvalidInput(format!(
                "{AMBIGUITY_PREFIX} #{number}: {}",
                many.iter()
                    .map(|issue| crate::id::canonical_ref(issue).to_string())
                    .collect::<Vec<_>>()
                    .join(", ")
            ))),
        };
    }
    // An 8-character Crockford base32 id is the canonical identity. It is never
    // all digits (see [`crate::id`]), so this can only be reached after the
    // numeric fast path above has declined, and it is resolved *before* the
    // filename/title fragment scan so a selector that is exactly an id resolves
    // that issue rather than merely matching its (id-prefixed) filename.
    if crate::id::is_issue_id(raw) {
        let issues = store.list_all()?;
        let matched: Vec<&crate::model::Issue> = issues
            .iter()
            .filter(|i| {
                i.id.as_deref()
                    .is_some_and(|id| id.eq_ignore_ascii_case(raw))
            })
            .collect();
        return match matched.as_slice() {
            [one] => Ok(IssueSelector::Filename(one.filename.clone())),
            [] => Err(TixError::NotFound(format!("issue with id '{raw}'"))),
            _ => Err(TixError::InvalidInput(format!(
                "{AMBIGUITY_PREFIX} id '{raw}': {}",
                matched
                    .iter()
                    .map(|i| format!("#{} ({})", i.number, i.filename))
                    .collect::<Vec<_>>()
                    .join(", ")
            ))),
        };
    }
    // `list_all`: a selector must resolve an archived issue too (issue #1492).
    // Hiding archived issues here would make `tix show <fragment>` and
    // `tix archive <fragment>` fail on an issue the user can name.
    let issues = store.list_all()?;
    let by_filename: Vec<&String> = issues
        .iter()
        .filter(|i| i.filename.contains(raw))
        .map(|i| &i.filename)
        .collect();
    if by_filename.len() == 1 {
        return Ok(IssueSelector::Filename(by_filename[0].clone()));
    }
    let by_title: Vec<&crate::model::Issue> =
        issues.iter().filter(|i| i.title.contains(raw)).collect();
    if by_title.len() == 1 {
        return Ok(IssueSelector::Filename(by_title[0].filename.clone()));
    }
    if by_filename.len() > 1 || by_title.len() > 1 {
        let mut seen: HashSet<u32> = HashSet::new();
        let candidates: Vec<String> = issues
            .iter()
            .filter(|i| i.filename.contains(raw) || i.title.contains(raw))
            .filter(|i| seen.insert(i.number))
            .map(|i| format!("#{} ({})", i.number, i.filename))
            .collect();
        return Err(TixError::InvalidInput(format!(
            "{AMBIGUITY_PREFIX} '{raw}': {}",
            candidates.join(", ")
        )));
    }
    Err(TixError::NotFound(format!(
        "issue matching '{raw}' by number, filename or title"
    )))
}

/// Strict priority validation for user input: only `low`/`medium`/`high`
/// are accepted (`contracts/cli.md` enumerates exactly these three).
pub fn parse_priority(raw: &str) -> Result<Priority> {
    match raw.to_ascii_lowercase().as_str() {
        "low" => Ok(Priority::Low),
        "medium" => Ok(Priority::Medium),
        "high" => Ok(Priority::High),
        // An explicitly unset priority. Without this, the state `tix lint` accepts
        // could only be reached by hand-editing a file, which would make the
        // lint exemption a read-only fiction. Omitting `--priority` entirely is a
        // different thing and still yields the default `medium`, because the CLI
        // argument is `Option<String>` and `None` never reaches here.
        "" => Ok(Priority::Other(String::new())),
        _ => Err(TixError::InvalidInput(format!(
            "invalid priority '{raw}' — use '' (unset), low, medium or high"
        ))),
    }
}

/// Split a comma-separated list, trimming whitespace and dropping empty
/// entries (shared by `labels`, `links` and `files` parsing; D3).
pub fn parse_csv_list(raw: &str) -> Vec<String> {
    raw.split(',')
        .map(|s| s.trim().to_string())
        .filter(|s| !s.is_empty())
        .collect()
}

/// Resolve a `--commit auto` request for `issue`: the commit that last
/// touched its file, falling back to `HEAD` (see [`crate::git`]). This lets a
/// closure hash be back-filled after the closing commit has landed. Errors
/// when neither is available (not a git repository, or the file has never
/// been committed).
pub fn resolve_auto_commit(store: &Store, issue: &crate::model::Issue) -> Result<String> {
    let cwd = std::env::current_dir().unwrap_or_default();
    let path = store.issues_dir.join(&issue.filename);
    crate::git::resolve_closing_commit(&cwd, &path).ok_or_else(|| {
        TixError::InvalidInput(
            "could not resolve a commit hash for `auto` — not a git repository or the issue file is uncommitted"
                .to_string(),
        )
    })
}

#[cfg(test)]
mod tests {
    #[allow(clippy::wildcard_imports)]
    use super::*;
    use std::fs;
    use tempfile::TempDir;

    fn make_store() -> (TempDir, Store) {
        let tmp = TempDir::new().unwrap();
        let dir = tmp.path().join("issues");
        fs::create_dir_all(&dir).unwrap();
        let config_path = tmp.path().join("tix.toml");
        let config = crate::config::Config {
            issues_dir: dir.clone(),
            ..crate::config::Config::default()
        };
        config.save(&config_path).unwrap();
        let config = crate::config::Config::load_with_warning(&config_path, |_| {}).unwrap();
        (
            tmp,
            Store {
                issues_dir: dir,
                config,
            },
        )
    }

    fn write_issue(store: &Store, name: &str, number: u32, title: &str) {
        let contents = format!(
            "---\nnumber: {number}\ntitle: \"{title}\"\nstatus: \"todo\"\nlabels: []\npriority: \"medium\"\ncreated: \"2026-01-01\"\nupdated: \"2026-01-01\"\n---\n\nbody"
        );
        fs::write(store.issues_dir.join(name), contents).unwrap();
    }

    /// Like [`write_issue`], with an `id:` line (the new schema).
    fn write_issue_with_id(store: &Store, name: &str, number: u32, title: &str, id: &str) {
        let contents = format!(
            "---\nnumber: {number}\nid: {id}\ntitle: \"{title}\"\nstatus: \"todo\"\nlabels: []\npriority: \"medium\"\ncreated: \"2026-01-01\"\nupdated: \"2026-01-01\"\n---\n\nbody"
        );
        fs::write(store.issues_dir.join(name), contents).unwrap();
    }

    #[test]
    fn parse_priority_accepts_an_unset_value_and_still_rejects_typos() {
        // Without the empty case, the state `tix lint` accepts could only be
        // reached by hand-editing a file — the exemption would be read-only.
        let undefined = parse_priority("").unwrap();
        assert!(undefined.is_undefined());
        assert_eq!(undefined.to_string(), "");

        // Omitting `--priority` never reaches here at all (the CLI argument is
        // `Option<String>` and `create` uses `unwrap_or_default()`), so accepting
        // `''` here does not make "unset" the default.
        assert_eq!(parse_priority("medium").unwrap(), Priority::default());

        for typo in ["hih", "urgent", "0", "lowest"] {
            assert!(
                parse_priority(typo).is_err(),
                "{typo:?} must still be rejected"
            );
        }
    }

    #[test]
    fn selector_bare_number_wins() {
        let (tmp, store) = make_store();
        let _ = tmp;
        write_issue(&store, "2026-01-02-ticket-55.md", 55, "Ticket 55");
        assert_eq!(
            parse_selector(&store, "55").unwrap(),
            IssueSelector::Number(55)
        );
    }

    #[test]
    fn selector_unique_filename_fragment() {
        let (tmp, store) = make_store();
        let _ = tmp;
        write_issue(&store, "2026-05-10-add-docs.md", 1, "Add documentation");
        assert_eq!(
            parse_selector(&store, "add-doc").unwrap(),
            IssueSelector::Filename("2026-05-10-add-docs.md".into())
        );
    }

    #[test]
    fn selector_unique_title_fragment() {
        let (tmp, store) = make_store();
        let _ = tmp;
        write_issue(&store, "2026-01-01-fix-login.md", 1, "Fix login bug");
        assert_eq!(
            parse_selector(&store, "login").unwrap(),
            IssueSelector::Filename("2026-01-01-fix-login.md".into())
        );
    }

    #[test]
    fn selector_unique_filename_fragment_matches_grouped_relative_path() {
        let (tmp, store) = make_store();
        let _ = tmp;
        fs::create_dir_all(store.issues_dir.join("alice")).unwrap();
        write_issue(
            &store,
            "alice/2026-05-10-add-docs.md",
            1,
            "Add documentation",
        );
        assert_eq!(
            parse_selector(&store, "add-doc").unwrap(),
            IssueSelector::Filename("alice/2026-05-10-add-docs.md".into())
        );
    }

    #[test]
    fn selector_full_grouped_relative_path_resolves() {
        let (tmp, store) = make_store();
        let _ = tmp;
        fs::create_dir_all(store.issues_dir.join("alice")).unwrap();
        write_issue(
            &store,
            "alice/2026-05-10-add-docs.md",
            1,
            "Add documentation",
        );
        assert_eq!(
            parse_selector(&store, "alice/2026-05-10-add-docs.md").unwrap(),
            IssueSelector::Filename("alice/2026-05-10-add-docs.md".into())
        );
    }

    #[test]
    fn selector_ambiguous_lists_candidates() {
        let (tmp, store) = make_store();
        let _ = tmp;
        write_issue(&store, "2026-01-01-a.md", 1, "Fix bug A");
        write_issue(&store, "2026-01-02-b.md", 2, "Fix bug B");
        let err = parse_selector(&store, "bug").unwrap_err();
        assert!(
            matches!(&err, TixError::InvalidInput(m) if m.starts_with(AMBIGUITY_PREFIX)),
            "got {err:?}"
        );
        assert!(err.to_string().contains("#1"));
        assert!(err.to_string().contains("#2"));
    }

    #[test]
    fn selector_missing_is_not_found() {
        let (tmp, store) = make_store();
        let _ = tmp;
        write_issue(&store, "2026-01-01-a.md", 1, "Fix bug A");
        assert!(matches!(
            parse_selector(&store, "zzz-nonexistent").unwrap_err(),
            TixError::NotFound(_)
        ));
    }

    #[test]
    fn selector_resolves_an_issue_id_case_insensitively() {
        let (tmp, store) = make_store();
        let _ = tmp;
        write_issue_with_id(
            &store,
            "2026-01-01-A1B2C3D4-fix-login.md",
            1,
            "Fix login",
            "A1B2C3D4",
        );
        for raw in ["A1B2C3D4", "a1b2c3d4", "a1B2c3D4"] {
            assert_eq!(
                parse_selector(&store, raw).unwrap(),
                IssueSelector::Filename("2026-01-01-A1B2C3D4-fix-login.md".into()),
                "{raw} must resolve the id"
            );
        }
    }

    #[test]
    fn selector_unknown_wellformed_id_is_not_found() {
        let (tmp, store) = make_store();
        let _ = tmp;
        write_issue_with_id(
            &store,
            "2026-01-01-A1B2C3D4-fix-login.md",
            1,
            "Fix login",
            "A1B2C3D4",
        );
        // A well-formed id that matches nothing is a not-found, not a fragment scan.
        assert!(matches!(
            parse_selector(&store, "ZZZZZZZZ").unwrap_err(),
            TixError::NotFound(_)
        ));
    }

    #[test]
    fn an_all_digits_selector_stays_a_number_not_an_id() {
        // Ids are never all digits (see `crate::id`), so an 8-digit selector must
        // keep meaning the number, and must not scan for an id.
        let (tmp, store) = make_store();
        let _ = tmp;
        write_issue(&store, "2026-01-01-a.md", 12_345_678, "Big number");
        assert_eq!(
            parse_selector(&store, "12345678").unwrap(),
            IssueSelector::Number(12_345_678)
        );
    }

    #[test]
    fn priority_accepts_the_three_named_values_and_an_explicit_unset() {
        assert_eq!(parse_priority("low").unwrap(), Priority::Low);
        assert_eq!(parse_priority("HIGH").unwrap(), Priority::High);
        assert_eq!(parse_priority("medium").unwrap(), Priority::Medium);
        assert!(parse_priority("urgent").is_err());
        // The empty string is the TUI form's own default (`ui/form.rs` seeds
        // `priority: String::new()`), so rejecting it flagged every issue the
        // TUI created. `parse_priority_accepts_an_unset_value_and_still_rejects_typos`
        // covers this case in more depth.
        assert!(parse_priority("").unwrap().is_undefined());
    }
}