tix-tracker 0.12.0

#[allow(clippy::wildcard_imports)]
use super::*;

impl App {
    #[allow(clippy::too_many_lines)]
    pub(in crate::app) fn handle_form_key(&mut self, key: KeyEvent) -> Result<Action> {
        if self.form_picker.is_some() {
            return self.handle_form_picker_key(key);
        }
        let form = match self.form.as_mut() {
            Some(f) => f,
            None => return Ok(Action::None),
        };
        match key.code {
            KeyCode::Esc => {
                self.form = None;
                self.mode = Mode::Board;
                Ok(Action::None)
            }
            KeyCode::Enter => {
                // The Target row is a toggle, not a submit: Enter flips Triage /
                // Todo and writes the matching status, which is what determines
                // the created issue's column. It has to be handled before the
                // submit path, or choosing a target would create the issue.
                if form.focus.is_target() {
                    let next = form.target.next();
                    self.set_form_target(next);
                    return Ok(Action::None);
                }
                // Likewise the Template row: Enter opens the picker rather than
                // submitting a form whose template the user was reaching for.
                if form.focus.is_template() {
                    self.open_template_picker();
                    return Ok(Action::None);
                }
                if form.is_date_focus() && !form.focused_date_is_complete() {
                    self.open_date_picker(Mode::Form);
                    return Ok(Action::None);
                }
                // A parent is chosen, never typed, so an **empty** Parent row has
                // nothing to submit and Enter means "choose". This is the same rule
                // the date fields follow one branch above — Enter opens the picker
                // only while the value is missing, and submits once it is there.
                //
                // Not "always open the picker", which was the first attempt: that
                // makes Parent a field the form can never be submitted from, because
                // Enter there never submits and the only way out is to tab away. A
                // chosen field that traps the submit key is worse than a plain text
                // field.
                if form.focus.is_parent() && form.parent.trim().is_empty() {
                    self.open_form_picker();
                    return Ok(Action::None);
                }
                // Status and Priority are chosen from their dropdowns and refuse
                // typing (tix #1508), so Enter on either row means "choose" and
                // never submits — the same way a Parent row keeps Enter for the
                // picker. The user submits from another row.
                if form.focus.is_status() || form.focus.is_priority() {
                    self.open_form_picker();
                    return Ok(Action::None);
                }
                // A stable-ID template selection resolves through the **shared**
                // resolver and writes through the **shared** create core
                // (C-007/NFR-002). Only the pick/toggle interactions above are
                // handled first — this is the submit itself, so it runs before the
                // form's own field checks: the resolver owns required/reference
                // diagnostics and the create core owns column/planning/date
                // validation, so neither is restated here (and the two paths
                // cannot drift).
                if let Some(scope) = form.template_scope.clone() {
                    let id = form.template.clone();
                    let input = template_input_from_form(form);
                    // WP06 T029: the template route carries the Projects row too, so
                    // the row is not a no-op on the one create path that goes through
                    // the shared resolver. Resolved through the service, before
                    // anything is written, exactly as the other route does — a refusal
                    // leaves the form and the store untouched.
                    let project_ids = match crate::commands::project::resolve_projects(
                        &self.store.config,
                        &form.projects,
                    ) {
                        Ok(ids) => ids,
                        Err(e) => {
                            self.status_msg = Some(e.to_string());
                            return Ok(Action::None);
                        }
                    };
                    // WP06 T031: the template route carries the Epics row too,
                    // resolved through the epic service before anything is written —
                    // a refusal leaves the form and the store untouched, exactly as
                    // the other route does.
                    let epic_ids =
                        match crate::commands::epic::resolve_epics(&self.store.config, &form.epics)
                        {
                            Ok(ids) => ids,
                            Err(e) => {
                                self.status_msg = Some(e.to_string());
                                return Ok(Action::None);
                            }
                        };
                    return self.submit_stable_template(
                        &id,
                        &scope,
                        &input,
                        &project_ids,
                        &epic_ids,
                    );
                }
                if form.title.trim().is_empty() {
                    self.status_msg = Some("Title is required".to_string());
                    return Ok(Action::None);
                }
                let start_date = if form.start_date.trim().is_empty() {
                    None
                } else {
                    Some(form.start_date.trim().to_string())
                };
                let due_date = if form.due_date.trim().is_empty() {
                    None
                } else {
                    Some(form.due_date.trim().to_string())
                };
                if let Some(start) = start_date.as_deref()
                    && !crate::model::validate_date(start)
                {
                    self.status_msg = Some("Start date must be YYYY-MM-DD".to_string());
                    return Ok(Action::None);
                }
                if let Some(due) = due_date.as_deref()
                    && !crate::model::validate_date(due)
                {
                    self.status_msg = Some("Due date must be YYYY-MM-DD".to_string());
                    return Ok(Action::None);
                }
                if let (Some(start), Some(due)) = (start_date.as_deref(), due_date.as_deref())
                    && due < start
                {
                    self.status_msg = Some("Due date must be >= start date".to_string());
                    return Ok(Action::None);
                }
                let title = form.title.trim().to_string();
                // The body is submitted verbatim — not trimmed, because leading or
                // trailing blank lines in Markdown are content, and a template
                // writes them on purpose.
                let body = form.body.clone();
                let status_str = if form.status.trim().is_empty() {
                    self.store
                        .config
                        .default_config()
                        .columns
                        .first()
                        .cloned()
                        .unwrap_or_else(|| "todo".to_string())
                } else {
                    form.status.trim().to_string()
                };
                let priority: Priority = form.priority.parse().unwrap_or_default();
                let identity = git_identity();
                let assignee = if form.assignee.trim().is_empty() {
                    None
                } else {
                    resolve_me(form.assignee.trim(), identity.as_ref())
                };
                let labels: Vec<String> = form
                    .labels
                    .split(',')
                    .map(|s| s.trim().to_string())
                    .filter(|s| !s.is_empty())
                    .collect();
                let estimate = if form.estimate.trim().is_empty() {
                    None
                } else {
                    Some(form.estimate.trim().to_string())
                };
                let cycles = {
                    let values: Vec<String> = form
                        .cycles
                        .split(',')
                        .map(str::trim)
                        .filter(|s| !s.is_empty())
                        .map(str::to_string)
                        .collect();
                    if values.is_empty() {
                        // No explicit selection joins the default cycle, the
                        // same answer the CLI create core gives (tui-cycle-mode).
                        Some(vec![crate::commands::create::default_cycle_name(
                            &self.store.config,
                        )])
                    } else {
                        Some(values)
                    }
                };
                let milestones = {
                    let values: Vec<String> = form
                        .milestones
                        .split(',')
                        .map(str::trim)
                        .filter(|s| !s.is_empty())
                        .map(str::to_string)
                        .collect();
                    (!values.is_empty()).then_some(values)
                };
                let reviewer = if form.reviewer.trim().is_empty() {
                    None
                } else {
                    Some(form.reviewer.trim().to_string())
                };

                // The parent is resolved and validated through the hierarchy
                // service **before** anything is written, exactly as
                // `commands::create` does it — same resolution, same
                // `validate_new_parent`, so a bad parent creates no file, no
                // number, and no History entry. The service's own diagnostic is
                // what reaches `status_msg`, so the TUI says what the CLI says
                // rather than a second wording of the same rule.
                //
                // `validate_new_parent`, not `set_parent`: the child does not exist
                // yet, so it cannot be its own parent and cannot close a cycle. A
                // self-parent and a cycle are both *unrepresentable* here, not merely
                // rejected.
                //
                // **This call is not test-covered, and the reason is worth stating
                // rather than leaving implied.** The picker's options come from the
                // store, so every value the user can choose is a live issue; and
                // `unknown_parent` needs a selector that *resolves* to a number the
                // index does not hold. `resolve_issue` and `hierarchy_index` each
                // re-read the store, so that state exists only for a delete landing
                // between the two reads — a window no single-threaded test can enter,
                // since deleting first makes `resolve_issue` fail instead (which is
                // the refusal `t027_a_rejected_parent_keeps_the_form_open...` does
                // assert). Reverting the line leaves the suite green, so this is
                // defence in depth against a concurrent delete, kept because the CLI
                // has the identical line and the charter's parity boundary is about
                // what both surfaces *do*, not about which of them is covered.
                //
                // A rejection returns to the form with the field untouched, so the
                // user keeps everything they typed and can pick again.
                let (parent_ref, parent_number) = match form.parent.trim() {
                    "" => (None, None),
                    raw => match self.store.resolve_issue(raw).and_then(|target| {
                        let (index, _) = self.store.hierarchy_index()?;
                        crate::hierarchy::validate_new_parent(&index, target.number)?;
                        Ok(target)
                    }) {
                        Ok(target) => {
                            (Some(crate::id::canonical_ref(&target)), Some(target.number))
                        }
                        Err(e) => {
                            self.status_msg = Some(e.to_string());
                            return Ok(Action::None);
                        }
                    },
                };

                // WP06 T029 step 4/5: the associations are **the service's**. They
                // are resolved before anything is written, through the same
                // `create --projects` helper the CLI uses, so an unknown project
                // refuses the whole create with the service's own diagnostic — the
                // form stays open, the field keeps its value, and no file, number or
                // History entry is made. The form constructs no project and validates
                // none; it hands the service the ids the picker chose.
                let project_ids = match crate::commands::project::resolve_projects(
                    &self.store.config,
                    &form.projects,
                ) {
                    Ok(ids) => ids,
                    Err(e) => {
                        self.status_msg = Some(e.to_string());
                        return Ok(Action::None);
                    }
                };
                // WP06 T031: the epic references are resolved through the service
                // **before** anything is written, so an unknown epic refuses the whole
                // create with the service's own diagnostic — the form stays open, the
                // field keeps its value, and no file, number or History entry is made.
                // The form constructs no epic and validates none; it hands the service
                // the ids the picker chose.
                let epic_ids =
                    match crate::commands::epic::resolve_epics(&self.store.config, &form.epics) {
                        Ok(ids) => ids,
                        Err(e) => {
                            self.status_msg = Some(e.to_string());
                            return Ok(Action::None);
                        }
                    };

                let mut issue = Issue {
                    projects: None,
                    id: None,
                    number: 0,
                    type_: None,
                    title,
                    status: Status::new(status_str),
                    labels,
                    priority,
                    assignee,
                    estimate,
                    commit: None,
                    gitlab_id: None,
                    linear_id: None,
                    mission: None,
                    task: None,
                    relationships: vec![],
                    related_issues: vec![],
                    series: None,
                    health: None,
                    files: vec![],
                    cycles,
                    milestones,
                    reviewer,
                    start_date,
                    due_date,
                    created: today(),
                    updated: today(),
                    filename: String::new(),
                    body: String::new(),
                    history: crate::model::History::new(),
                    has_retired_links_key: false,
                    time_entries: vec![],
                    parent: parent_ref,
                    epics: None,
                    extra_frontmatter: std::collections::BTreeMap::new(),
                    archived: false,
                    entered_at: None,
                    source: None,
                };
                // Exactly one History entry, naming the parent (C-004). Appended to
                // the in-memory issue so `store.create` writes it with the first
                // content — an entry that only appeared on a later edit would
                // describe a create that did not happen this way. This is the step
                // the TUI's hand-built `Issue` was silently skipping (tix #1385).
                if let Some(parent_number) = parent_number {
                    issue.history.append_now(
                        &crate::storage::actor_identity(),
                        crate::model::HistoryEventKind::ParentSet,
                        &crate::hierarchy::change_detail(None::<u32>, Some(parent_number)),
                    );
                }
                // The entry stamp, through the **same** rule the CLI's create core
                // uses: without it this form was the one create path that entered the
                // inbox without recording when, so the queue reported an `unknown` age
                // for an issue the TUI had just created. (The form still builds its own
                // `Issue` rather than calling `commands::create::create` — see tix #1385
                // for the parent/History line that cost once already; what must not be
                // duplicated is the *rule*, and it no longer is.) Applied **before** the
                // write, so the file and the stamp cannot disagree.
                crate::triage::record_entry_if_inbox(&self.store.config, &mut issue, "new")?;
                self.store.create(&mut issue, &body, None)?;
                // WP06 T029 step 4: one store-level association write per id, the
                // same helper the CLI's create core calls — so the History entry is
                // appended **exactly once** per project and the idempotence rule is
                // the service's, not a second implementation here. The ids were
                // resolved before the issue existed, so this cannot leave a
                // half-associated create.
                crate::commands::project::associate_created(&self.store, &issue, &project_ids)?;
                // WP06 T031 step 4: the epic references are written through the
                // **service's** own store helper, so the History entry is appended
                // exactly once per epic and the idempotence rule stays the service's,
                // not a second implementation here. The ids were resolved before the
                // issue existed, so this cannot leave a half-referenced create.
                crate::commands::epic::reference_created(&self.store, &issue, &epic_ids)?;
                // `issue.filename` is the store-relative path (including the
                // assignee segment); the board's cards key on that, so select
                // with it — the basename would never match and the wrong card
                // would stay selected.
                let filename = issue.filename.clone();
                let basename = filename.rsplit('/').next().unwrap_or(&filename).to_string();
                self.status_msg = Some(format!("Created {basename}"));
                self.form = None;
                self.mode = Mode::Board;
                self.refresh_corpus()?;
                self.select_card_by_filename(&filename);
                Ok(Action::None)
            }
            KeyCode::Tab | KeyCode::Down => {
                form.move_focus_next();
                Ok(Action::None)
            }
            KeyCode::BackTab | KeyCode::Up => {
                form.move_focus_prev();
                Ok(Action::None)
            }
            // On the Target row, Left/Right pick a side directly (Enter above
            // toggles). Everywhere else they move the insertion point one
            // character, or one word with Ctrl/Alt held (tix #1746).
            KeyCode::Left => {
                if form.focus.is_target() {
                    self.set_form_target(crate::ui::form::NewIssueTarget::Triage);
                } else if key
                    .modifiers
                    .intersects(KeyModifiers::CONTROL | KeyModifiers::ALT)
                {
                    form.move_cursor_word_left();
                } else {
                    form.move_cursor_left();
                }
                Ok(Action::None)
            }
            KeyCode::Right => {
                if form.focus.is_target() {
                    self.set_form_target(crate::ui::form::NewIssueTarget::Todo);
                } else if key
                    .modifiers
                    .intersects(KeyModifiers::CONTROL | KeyModifiers::ALT)
                {
                    form.move_cursor_word_right();
                } else {
                    form.move_cursor_right();
                }
                Ok(Action::None)
            }
            KeyCode::Home => {
                form.cursor_to_start();
                Ok(Action::None)
            }
            KeyCode::End => {
                form.cursor_to_end();
                Ok(Action::None)
            }
            KeyCode::F(2) => {
                if form.is_date_focus() {
                    self.open_date_picker(Mode::Form);
                } else {
                    self.open_form_picker();
                }
                Ok(Action::None)
            }
            // The Emacs set (`Ctrl-A/E/B/F/H/D/K/U/W`) and `Ctrl-Backspace`,
            // which is what readline-style prompts everywhere bind. Keys are
            // matched on the **character**, case-folded, because a terminal may
            // report Ctrl-Shift-A as either case.
            KeyCode::Char(c) if key.modifiers.contains(KeyModifiers::CONTROL) => {
                match c.to_ascii_lowercase() {
                    'a' => form.cursor_to_start(),
                    'e' => form.cursor_to_end(),
                    'b' => form.move_cursor_left(),
                    'f' => form.move_cursor_right(),
                    'h' => form.delete_char(),
                    'd' => form.delete_forward_char(),
                    'k' => form.delete_to_end(),
                    'u' => form.delete_to_start(),
                    'w' => form.delete_word_backward(),
                    _ => {}
                }
                Ok(Action::None)
            }
            KeyCode::Char(c) => {
                form.insert_char(c);
                Ok(Action::None)
            }
            KeyCode::Backspace => {
                if key
                    .modifiers
                    .intersects(KeyModifiers::CONTROL | KeyModifiers::ALT)
                {
                    form.delete_word_backward();
                } else {
                    form.delete_char();
                }
                Ok(Action::None)
            }
            KeyCode::Delete => {
                form.delete_forward_char();
                Ok(Action::None)
            }
            _ => Ok(Action::None),
        }
    }

    /// Submit the form through the shared template resolver and create core
    /// (WP05/T025).
    ///
    /// The selection is resolved by [`crate::templates::resolve`], which is pure
    /// and returns **every** diagnostic and no request on failure; a failed
    /// resolution sets `status_msg` and leaves both the form and the store
    /// untouched — no partial issue, exactly as the CLI's template path
    /// (C-005/FR-004). On success the request is destructured straight into
    /// [`crate::commands::create::create`], the same core `tix create --template`
    /// and the MCP create tool use, so the created issue is equivalent to the
    /// CLI's for the same template, scope and input (C-007/NFR-002). The template
    /// ID and scope stay visible: they are on the form's Template row before
    /// submit and in the result message after (FR-005).
    pub(in crate::app) fn submit_stable_template(
        &mut self,
        id: &str,
        scope: &str,
        input: &TemplateInput,
        project_ids: &[String],
        epic_ids: &[String],
    ) -> Result<Action> {
        let scope = match scope.parse::<TemplateScope>() {
            Ok(scope) => scope,
            Err(error) => {
                self.status_msg = Some(error);
                return Ok(Action::None);
            }
        };
        let scope_label = scope.to_string();
        let selection = TemplateSelection::new(id, scope);
        let resolution = resolve(&self.store.config, &selection, input);
        if !resolution.is_ok() {
            let diagnostics = resolution
                .diagnostics()
                .iter()
                .map(|diagnostic| format!("{}: {}", diagnostic.field(), diagnostic.message()))
                .collect::<Vec<_>>()
                .join(" | ");
            self.status_msg = Some(format!(
                "template `{}` at scope `{}` did not resolve: {diagnostics}",
                resolution.template_id(),
                resolution.scope()
            ));
            return Ok(Action::None);
        }
        let request = resolution
            .into_request()
            .expect("a successful resolution always carries a request");
        let issue = match crate::commands::create::create(
            &self.store.config,
            &self.store,
            &request.title,
            request.body.as_deref(),
            request.status.clone(),
            request.priority.clone(),
            request.assignee.as_deref(),
            request.labels.as_deref(),
            request.files.as_deref(),
            request.estimate.as_deref(),
            request.cycles.as_deref(),
            request.milestones.as_deref(),
            request.reviewer.as_deref(),
            request.start_date.as_deref(),
            request.due_date.as_deref(),
            request.parent.as_deref(),
            request.related_issues.as_deref(),
            request.type_.as_deref(),
        ) {
            Ok(issue) => issue,
            Err(error) => {
                // The create core validates the column, planning references,
                // dates and parent **before** `Store::create`, so a refusal here
                // wrote nothing; the form keeps everything the user typed.
                self.status_msg = Some(error.to_string());
                return Ok(Action::None);
            }
        };
        let filename = issue.filename.clone();
        // WP06 T029 step 4: the same store-level association write the other create
        // route uses, so the Project History entry is appended exactly once and the
        // idempotence rule stays the service's. The ids were resolved before the
        // create, so this cannot leave a half-associated issue.
        crate::commands::project::associate_created(&self.store, &issue, project_ids)?;
        // WP06 T031: the epic references, through the same store-level service path
        // the other create route uses, so the History entry is appended exactly once
        // per epic and the idempotence rule stays the service's.
        crate::commands::epic::reference_created(&self.store, &issue, epic_ids)?;
        let basename = filename.rsplit('/').next().unwrap_or(&filename).to_string();
        self.status_msg = Some(format!(
            "Created {basename} (template `{id}` at scope `{scope_label}`)"
        ));
        self.form = None;
        self.mode = Mode::Board;
        self.refresh_corpus()?;
        self.select_card_by_filename(&filename);
        Ok(Action::None)
    }

    /// Open the calendar picker, seeded from the focused date field of the
    /// modal identified by `return_to`.
    pub(in crate::app) fn open_date_picker(&mut self, return_to: Mode) {
        let current = match return_to {
            Mode::Form => self.form.as_ref().map(|f| f.focused_value().to_string()),
            Mode::PlanningForm => self
                .planning_form
                .as_ref()
                .map(|f| f.focused_value().to_string()),
            Mode::FilterModal => self.filter_modal.as_ref().map(|m| m.focused_value()),
            _ => None,
        };
        self.date_picker = Some(DatePicker::new(current.as_deref().unwrap_or("")));
        self.mode = Mode::DatePicker {
            return_to: Box::new(return_to),
        };
    }

    pub(in crate::app) fn handle_date_picker_key(&mut self, key: KeyEvent) -> Result<Action> {
        let Some(picker) = self.date_picker.as_mut() else {
            self.mode = Mode::Board;
            return Ok(Action::None);
        };
        match picker.handle_key(key.code) {
            DatePickerEvent::None => {}
            DatePickerEvent::Cancelled => self.close_date_picker(),
            DatePickerEvent::Selected(value) => {
                self.apply_date_selection(&value);
                self.close_date_picker();
            }
            DatePickerEvent::Cleared => {
                self.apply_date_selection("");
                self.close_date_picker();
            }
        }
        Ok(Action::None)
    }

    /// Close the picker and restore the modal that opened it.
    pub(in crate::app) fn close_date_picker(&mut self) {
        let return_to = match std::mem::replace(&mut self.mode, Mode::Board) {
            Mode::DatePicker { return_to } => *return_to,
            _ => Mode::Board,
        };
        self.date_picker = None;
        self.mode = return_to;
    }

    /// Write the picked `value` (empty clears) into the modal the picker was
    /// opened from.
    pub(in crate::app) fn apply_date_selection(&mut self, value: &str) {
        let return_to = match &self.mode {
            Mode::DatePicker { return_to } => (**return_to).clone(),
            _ => return,
        };
        match return_to {
            Mode::Form => {
                if let Some(form) = self.form.as_mut() {
                    form.set_focused_date(value);
                }
            }
            Mode::PlanningForm => {
                if let Some(form) = self.planning_form.as_mut() {
                    form.set_focused_date(value);
                }
            }
            Mode::FilterModal => {
                if let Some(modal) = self.filter_modal.as_mut() {
                    modal.set_focused_date(value);
                }
                self.rebuild_board();
            }
            _ => {}
        }
    }

    /// The status a New Issue target lands the created issue in.
    ///
    /// Derived from configuration rather than hard-coded so a renamed column still
    /// works: `Triage` is the inbox's `entry_status` when the project has one, and
    /// `Todo` is a literal `todo` column when the board names one. The `Todo`
    /// fallbacks keep a project whose columns are not named `todo` creating
    /// *somewhere real* — its accepted status, then its first column — rather than
    /// writing a status the board cannot show.
    pub(in crate::app) fn new_issue_target_status(&self, target: NewIssueTarget) -> String {
        let triage = self.store.config.triage.as_ref();
        match target {
            NewIssueTarget::Triage => triage
                .and_then(|t| t.entry_status.as_deref())
                .map(str::trim)
                .filter(|s| !s.is_empty())
                .unwrap_or("triage")
                .to_string(),
            NewIssueTarget::Todo => {
                let columns = &self.store.config.default_config().columns;
                if columns.iter().any(|c| c == "todo") {
                    return "todo".to_string();
                }
                triage
                    .and_then(|t| t.accepted_status.as_deref())
                    .map(str::trim)
                    .filter(|s| !s.is_empty())
                    .map(str::to_string)
                    .or_else(|| columns.first().cloned())
                    .unwrap_or_else(|| "todo".to_string())
            }
        }
    }

    /// Choose a New Issue target and write its status into the Status row.
    ///
    /// Writing the status is what makes the choice *determine* the created issue's
    /// column: submit reads `form.status`, so the Target row cannot disagree with
    /// what is created. The Status row stays editable afterwards, which is how a
    /// column the two targets do not name is still reachable.
    pub(in crate::app) fn set_form_target(&mut self, target: NewIssueTarget) {
        let status = self.new_issue_target_status(target);
        if let Some(form) = self.form.as_mut() {
            form.target = target;
            form.status = status;
        }
    }

    /// Open the Template row's picker over the configured templates.
    ///
    /// A `(none)` option comes first so the selection is clearable; choosing it
    /// only drops the label, leaving whatever the template pre-filled in place,
    /// because the user's typed values are the form's, not the template's.
    ///
    /// **Applicability boundary (WP05/T026):** template *management* —
    /// create/update/duplicate/delete and the preserved-unknown-metadata view —
    /// lives on the CLI (`tix template …`) and is deliberately not duplicated
    /// here. The TUI's surface is *selection*: it lists each stable template's
    /// ID, display name and explicit scope and seeds the form from the chosen
    /// one, which is the metadata this mode actually needs. Neither the board nor
    /// the form mode is otherwise touched.
    pub(in crate::app) fn open_template_picker(&mut self) {
        if self.store.config.issue_templates.is_empty() && self.store.config.templates.is_empty() {
            self.status_msg = Some(
                "No templates configured; add [issue_templates.<id>] or [templates.<name>] to \
                 tix.toml"
                    .to_string(),
            );
            return;
        }
        let mut options = vec![PickerItem {
            id: String::new(),
            label: "(none)".to_string(),
        }];
        options.extend(self.template_picker_options());
        let mut state = DropdownState::single(options);
        self.seed_picker_selection(FormPickerField::Template, &mut state);
        self.form_picker = Some(FormPicker {
            field: FormPickerField::Template,
            state,
        });
    }

    /// Pre-fill the form from a named **legacy** template, or clear the selection
    /// for an empty/unknown name.
    ///
    /// Clears any stable scope, so the submit path cannot keep resolving through
    /// the stable resolver after a legacy record is chosen.
    pub(in crate::app) fn select_template(&mut self, name: &str) {
        let template = self.store.config.templates.get(name).cloned();
        if let Some(form) = self.form.as_mut() {
            match template {
                Some(template) => form.apply_template(name, &template),
                None => {
                    form.template.clear();
                    form.template_scope = None;
                }
            }
        }
    }

    /// Pre-fill the form from a stable-ID template and record its ID + scope, or
    /// clear the selection when the ID is unknown.
    ///
    /// The scope is the template's **own declared scope**, which is explicit and
    /// visible (C-003/FR-005); the shared resolver re-checks it at submit, so a
    /// mismatch can never reach a write.
    pub(in crate::app) fn select_stable_template(&mut self, id: &str) {
        let template = self.store.config.issue_templates.get(id).cloned();
        if let Some(form) = self.form.as_mut() {
            match template {
                Some(template) => {
                    let scope = template.scope.to_string();
                    form.apply_stable_template(id, &scope, &template);
                }
                None => {
                    form.template.clear();
                    form.template_scope = None;
                }
            }
        }
    }

    /// Decode a namespaced Template picker option id and apply it.
    ///
    /// An empty id is `(none)` and clears the selection without emptying the
    /// form. An unprefixed non-empty id is treated as a legacy name, so a raw
    /// name still selects the legacy record rather than silently clearing the row.
    pub(in crate::app) fn apply_template_choice(&mut self, raw_id: &str) {
        if let Some(id) = raw_id.strip_prefix(STABLE_TEMPLATE_PREFIX) {
            self.select_stable_template(id);
        } else if let Some(name) = raw_id.strip_prefix(LEGACY_TEMPLATE_PREFIX) {
            self.select_template(name);
        } else if raw_id.is_empty() {
            if let Some(form) = self.form.as_mut() {
                form.template.clear();
                form.template_scope = None;
            }
        } else {
            self.select_template(raw_id);
        }
    }

    /// Run a New Issue-mode pointer action recorded during the draw. Public so the
    /// hit-region tests drive the same path the run loop does.
    pub fn apply_new_issue_action(&mut self, action: Action) -> Result<Action> {
        match action {
            Action::TemplateOpen => self.open_template_picker(),
            Action::TemplatePickOption(row) => {
                let chosen = self.form_picker.as_ref().and_then(|picker| {
                    if picker.field != FormPickerField::Template {
                        return None;
                    }
                    let index = *picker.state.visible_indices().get(row)?;
                    Some(picker.state.options.get(index)?.id.clone())
                });
                if let Some(id) = chosen {
                    self.form_picker = None;
                    self.apply_template_choice(&id);
                }
            }
            _ => {}
        }
        Ok(Action::None)
    }

    /// Open the F4 New Issue mode — `n` on the board, the F4 shell chord, and
    /// where `tix new` starts the session (#1398, tui-new-issue-mode).
    ///
    /// Seeds the default target's status and the git identity (FR-028, best effort:
    /// empty when git is absent, never an error). One method rather than copies,
    /// because the key, the shell switch, and the command must produce the *same*
    /// form — entry points into one mode that default differently is how a bug is
    /// born.
    pub fn open_new_issue_form(&mut self) {
        let default_assignee = crate::assignee::git_identity()
            .map(|id| id.to_string())
            .unwrap_or_default();
        let target = NewIssueTarget::default();
        let default_status = self.new_issue_target_status(target);
        let mut form = FormState::with_default_assignee(&default_status, &default_assignee);
        form.target = target;
        self.enter_form(form);
    }

    /// Put `form` on screen as the New Issue mode and record the shell mode.
    pub(in crate::app) fn enter_form(&mut self, form: FormState) {
        self.form = Some(form);
        self.mode = Mode::Form;
        // `sync_top_mode` would derive this on the next key, but the direct entry
        // points (`tix new`, the F4 switch) draw the navigation highlight before any
        // key arrives, so the mode must be recorded here rather than a frame later.
        self.top_mode = TopMode::NewIssue;
    }
}