tix-tracker 0.12.0

use std::collections::HashMap;
use std::fmt;
use std::path::Path;

use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
use serde::de::Error as _;
use serde::{Deserialize, Deserializer, Serialize, Serializer};

use crate::error::{Result, TixError};

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

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum InputContext {
    Board,
    /// The batch modal (WP07). Its own context so a key means one thing there and
    /// is not borrowed from the board's — `space` marks a card in a batch and is not
    /// a board action, and `y` confirms in a batch and is not a board action either.
    BulkModal,
    /// The triage inbox and its decision modal (WP06, T029/T031).
    ///
    /// Its own context for the reason `BulkModal`'s doc gives:
    /// `a`/`d`/`u`/`f` decide here and would be board actions there, and the
    /// inbox is keyboard-driven all the way down. It carries **free text** (a
    /// decline reason, a duplicate target), so `cancel` is `esc` and *only*
    /// `esc` — `q` stays a typeable letter for the same reason `LinkPrompt`
    /// keeps it.
    Triage,
    /// The F3 Cycle mode (tui-cycle-mode).
    ///
    /// Its own context for the reason `Triage`'s doc gives: `m` opens planning
    /// management here and would be a board action there, `j`/`k` walk the cycle
    /// rows, and the mode carries no free text, so `q`/`esc` may close it.
    Cycle,
    /// The F5 Milestones mode.
    ///
    /// Its own context for the reason `Cycle`'s doc gives: `m` opens planning
    /// management here, `j`/`k` walk the rows, and it carries no free text, so
    /// `q`/`esc` may close it.
    Milestones,
    /// The F6 Repos mode (tix #1529).
    ///
    /// Its own context for the reason `Cycle`'s doc gives: `j`/`k` walk the
    /// repository rows, `Enter` runs tix in the selected one, and it carries no
    /// free text, so `q`/`esc` may close it.
    Repos,
    /// The `F7` Stats page (mission `project-issue-health-status-01M3C8HX`, WP06;
    /// the **Time** tab added by `per-issue-time-tracking-01M3C9A4`, WP05).
    ///
    /// Its own context for the reason `Repos`'s doc gives: `Tab`/`Shift+Tab` switch
    /// between the page's two tabs, `j`/`k` walk the active tab's rows, `Enter` opens
    /// the selected row's issue, and the Time tab's `a`/`e`/`x`/`f`/`s`/`h` act on its
    /// entries and its scope. It carries no free text, so `q`/`esc` may close it. The
    /// mutations are the Time tab's forms, which are routed through the shared time
    /// service.
    Stats,
    /// The F8 Schedule page (tix #1593, mission `recurring-issues-01M3C7G7`).
    ///
    /// Its own context for the reason `Cycle`'s doc gives: `j`/`k` walk the series
    /// rows, `g`/`p`/`r`/`x`/`s`/`d`/`i` act on the selected series, and it carries
    /// no free text, so `q`/`esc` may close it.
    Schedule,
    /// The F11 Library page (tix #1593).
    ///
    /// Its own context for the reason `Cycle`'s doc gives: `Tab` switches between
    /// its two registries rather than moving a board field, `Enter` applies the
    /// selected view, and `j`/`k` walk rows. It carries no free text, so
    /// `q`/`esc` may close it.
    Library,
    /// The F10 **Portfolio** page (WP06, tix #1593).
    ///
    /// Its own context for the reason `Cycle`'s doc gives: `Tab`/`Shift+Tab` switch
    /// between the Projects and Epics registries, `j`/`k` walk the active tab's rows,
    /// `h`/`l` walk the selected epic's members on the Epics tab, `Enter` opens the
    /// selected member issue's detail directly (FR-004), and `q`/`esc` may close it
    /// because it carries no free text.
    Portfolio,
    Rollover,
    Detail,
    Form,
    FormPicker,
    ConfirmDelete,
    MoveIntoDone,
    /// The blocked-move acknowledgement prompt (WP04). Its own context so the
    /// command bar can advertise `y`/`esc` and nothing else.
    ConfirmBlockedMove,
    Help,
    /// The keybindings overlay's `/` input line (tix #1496).
    ///
    /// Its own context for the reason [`InputContext::Filter`] is one: it reads **free
    /// text**. Keeping the list mode's `q`/`?` bound to cancel here would rewrite them
    /// to `esc` before the handler saw them, and a query could never contain a `q` —
    /// the same trap the free-text modes below document.
    HelpSearch,
    ContextMenu,
    /// The detail pane's `related_issues` picker (#1513).
    ///
    /// Its own context so the picker's `Enter` selects a related entry and does
    /// not borrow any detail-pane key. It carries no free text, so `cancel` is
    /// `Esc`; an unbound letter is a no-op rather than a filter character.
    RelatedPicker,
    Filter,
    FilterModal,
    Settings,
    SettingsPrompt,
    PlanningManagement,
    PlanningConfirm,
    PlanningForm,
    DatePicker,
    Comment,
    Asset,
    /// The editor round trip's repair prompt (tix #1506).
    ///
    /// Its own context: every key here is a decision about a file the editor just
    /// produced — apply the proposed fix, declare the key, reopen the editor on
    /// the retained copy, acknowledge and keep it, or discard it behind a second
    /// confirmation. It is the successor to #1506's `edit_warning` context, which
    /// the same prompt grew out of; there is deliberately only one such prompt.
    EditRepair,
    /// The edit-conflict prompt (tix #1510).
    ///
    /// Its own context for the reason [`InputContext::EditRepair`] has one: it is
    /// a modal decision with three distinct outcomes, and one of them — *compare* —
    /// reopens the editor, which no board key does. It carries no free text, so a
    /// letter could close it — but only `Esc` (bound to `ignore`) does, because the
    /// prompt closes through a decision and nothing else. `q` stays unbound.
    EditConflict,
    /// The two-step create/edit relationship prompt (#1359).
    ///
    /// Free text, so `cancel` is `Esc` and **only** `Esc` — see the note on the
    /// `Asset`/`Comment`/`Filter` group for why binding `q` here would be a real
    /// defect rather than a preference: a title fragment containing `q` is ordinary.
    LinkPrompt,
    /// The top-level mode shell (tui-mode-navigation).
    ///
    /// It binds only the five mode switches and the navigation toggle. It is
    /// consulted **after** the active top-level context (Board, Triage,
    /// PlanningManagement, Settings, Form) declines the pressed key, so a
    /// context that binds the key locally always wins — which is what keeps
    /// `F2` as `open_picker` inside a form and the `F(12)` sentinel untouched
    /// for a truly unbound key.
    Shell,
    /// The saved-views modal (WP05, T024–T027).
    ///
    /// Its own context for the reason `Settings` has one: `n`, `e`, `u`, `d`, and
    /// `x` mean "new view", "rename", "update from live", "duplicate", and
    /// "delete view" in this modal and something else on the board. Nothing in the
    /// list is typeable, so ordinary letters are free to be commands.
    Views,
    /// The saved-views modal's inline name prompt (WP05, T027).
    ///
    /// A separate context because it carries **free text**: a view named `dense`
    /// must be a name and not a "duplicate" command, and a name containing `q`
    /// must not close the prompt. Only `submit` and `cancel` are bound, which is
    /// what leaves every other key a letter — the same arrangement, for the same
    /// reason, as `SettingsPrompt`.
    ViewsPrompt,
}

impl InputContext {
    pub const ALL: &'static [Self] = &[
        Self::Board,
        Self::Rollover,
        Self::Detail,
        Self::Form,
        Self::FormPicker,
        Self::ConfirmDelete,
        Self::MoveIntoDone,
        Self::ConfirmBlockedMove,
        Self::Help,
        Self::HelpSearch,
        Self::ContextMenu,
        // Walked like every other context so the overlay's completeness guard
        // sees the related picker's keys too (#1513).
        Self::RelatedPicker,
        Self::Filter,
        Self::FilterModal,
        Self::BulkModal,
        Self::Triage,
        Self::Cycle,
        Self::Milestones,
        // Walked like every other context so the overlay's guard sees the Repos
        // mode's keys too (tix #1529).
        Self::Repos,
        // Walked like every other context so the guard sees the Stats page's keys
        // too (mission `project-issue-health-status-01M3C8HX`).
        Self::Stats,
        // Walked like every other context so the guard sees the Schedule page's
        // keys too (tix #1593).
        Self::Schedule,
        // Walked like every other context so the overlay's guard sees the
        // Library page's keys too (tix #1593).
        Self::Library,
        // Walked like every other context so the guard sees the Portfolio page's
        // keys too (WP06). A context the guard does not walk is a context whose
        // keys can go undocumented.
        Self::Portfolio,
        Self::Settings,
        Self::SettingsPrompt,
        Self::PlanningManagement,
        Self::PlanningConfirm,
        Self::PlanningForm,
        Self::DatePicker,
        Self::Comment,
        Self::Asset,
        Self::EditRepair,
        // Walked like every other context so the overlay's completeness guard
        // sees the conflict prompt's keys too (tix #1510).
        Self::EditConflict,
        // Free text like the others, and missing from this list until the overlay's
        // completeness guard needed it: a context the guard does not walk is a context
        // whose keys can go undocumented.
        Self::LinkPrompt,
        // The mode shell's switches, walked like every other context so the
        // completeness guard can see them.
        Self::Shell,
        Self::Views,
        Self::ViewsPrompt,
    ];

    pub const fn as_str(self) -> &'static str {
        match self {
            Self::Board => "board",
            Self::Rollover => "rollover",
            Self::Detail => "detail",
            Self::Form => "form",
            Self::FormPicker => "form_picker",
            Self::ConfirmDelete => "confirm_delete",
            Self::ConfirmBlockedMove => "confirm_blocked_move",
            Self::MoveIntoDone => "move_into_done",
            Self::Help => "help",
            Self::HelpSearch => "help_search",
            Self::ContextMenu => "context_menu",
            Self::RelatedPicker => "related_picker",
            Self::Filter => "filter",
            Self::FilterModal => "filter_modal",
            Self::BulkModal => "bulk_modal",
            Self::Settings => "settings",
            Self::SettingsPrompt => "settings_prompt",
            Self::PlanningManagement => "planning_management",
            Self::PlanningConfirm => "planning_confirm",
            Self::PlanningForm => "planning_form",
            Self::DatePicker => "date_picker",
            Self::Comment => "comment",
            Self::Asset => "asset",
            Self::EditRepair => "edit_repair",
            Self::EditConflict => "edit_conflict",
            Self::LinkPrompt => "link_prompt",
            Self::Views => "views",
            Self::ViewsPrompt => "views_prompt",
            Self::Triage => "triage",
            Self::Cycle => "cycle",
            Self::Milestones => "milestones",
            Self::Repos => "repos",
            Self::Stats => "stats",
            Self::Schedule => "schedule",
            Self::Library => "library",
            Self::Portfolio => "portfolio",
            Self::Shell => "shell",
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum TuiAction {
    MoveUp,
    MoveDown,
    MoveLeft,
    MoveRight,
    NextBoard,
    PreviousBoard,
    Open,
    Edit,
    Agent,
    /// Open the selected issue in a read-only viewer (tix #1507).
    ///
    /// `v` was free on both the board and the detail pane. Read-only by
    /// construction: the viewer runs on the issue file and never writes back.
    View,
    ToggleColumn,
    FilterModal,
    BulkModal,
    /// Open the triage inbox (WP06, T029). Its own action rather than a chord
    /// bolted onto another one, so `t` can be rebound from `keybindings.board`
    /// like every other board key and the help overlay can name it.
    Triage,
    /// Open the mentions view (OpenSpec change `issue-mentions`): every pending
    /// `@mention` the local user holds, across issues.
    ///
    /// Its own action rather than a chord bolted onto another one, for the reason
    /// `Triage`'s is: the chord is a rebindable board key, the help overlay can name
    /// it, and the bottom indicator row reads it back out of the effective bindings
    /// so the row cannot advertise a key the user has rebound away.
    ///
    /// The default is `i`, which was free on the board — `t` is the triage inbox, `v`
    /// the saved views, `f` the filter, and the board's letters are its navigation.
    OpenMentions,
    /// Open the saved-views modal (WP05, T024). Its own action for the reason
    /// `Triage`'s is: `v` is a rebindable board key and the help overlay names it.
    Views,
    /// Apply the view under the cursor (WP05, T025).
    ApplyView,
    /// Create a view from the live plan (WP05, T027).
    NewView,
    /// Rename the view under the cursor (WP05, T027).
    RenameView,
    /// Replace the view under the cursor's plan with the live plan (WP05, T027).
    UpdateView,
    /// Duplicate the view under the cursor under a fresh stable id (WP05, T027).
    DuplicateView,
    /// Delete the view under the cursor's **definition**, after confirmation
    /// (WP05, T027).
    DeleteView,
    Mark,
    Unmark,
    /// Empty the batch selection from the board (`X`).
    ///
    /// Its own action rather than an overload of `Unmark`: the modal's `X` empties
    /// the whole set while `x` removes one card, and the board now reads the same
    /// two keys. Canonicalizing both to one action would collapse the distinction.
    ClearMarks,
    MovePrevious,
    MoveNext,
    NewIssue,
    /// Duplicate the selected issue into the create-issue form, prefilled from it
    /// (tix #1484).
    ///
    /// `C`, the capital of `c` (toggle column): a pair that reads together without
    /// changing what any existing key means, which is the same rule `B`/`A` follow.
    CloneIssue,
    /// Show the archived issues on the board, or hide them again (tix #1492).
    ///
    /// `a` was unbound on the board. The toggle is a *reload*, not a display
    /// filter: the archived files are not read until it is on.
    ToggleArchived,
    /// Show each issue's sub-issues beneath it on the board, or hide them again
    /// (tix #1399).
    ///
    /// `u` was unbound on the board. Unlike the archive toggle this is display-only:
    /// the children are already in the board state, so flipping it **reorders** the
    /// column (one level deep) rather than re-reading the store.
    ToggleChildren,
    Delete,
    Refresh,
    Settings,
    Planning,
    NewBoard,
    Help,
    Quit,
    TextFilter,
    ReorderUp,
    ReorderDown,
    Close,
    ScrollUp,
    ScrollDown,
    /// Scroll the detail pane's body one row. `j`/`Down` and `k`/`Up` were freed
    /// for this when the relationship cursor moved to `Tab`/`BackTab`.
    ScrollLineDown,
    ScrollLineUp,
    /// Scroll the detail pane's body to the top (`g`) or bottom (`G`).
    ScrollTop,
    ScrollBottom,
    Comment,
    Asset,
    /// Open the create-relationship prompt from the detail view (#1359).
    NewRelationship,
    /// Re-kind or retarget the relationship under the detail pane's cursor.
    EditRelationship,
    /// Remove the relationship under the cursor, after confirmation.
    RemoveRelationship,
    /// Set, change or clear the open issue's parent from the detail pane
    /// (tix #1384).
    ///
    /// `P` was free in the detail pane. The prompt routes its write through the
    /// shared hierarchy service (`Store::set_parent`/`clear_parent`), which is
    /// the same seam `tix edit --parent` uses, so the TUI gains the
    /// set/change/clear parity for `parent` that the create-only form could not
    /// express.
    EditParent,
    /// Move the detail pane's relationship cursor (`Tab`/`BackTab`).
    NextRelationship,
    PreviousRelationship,
    /// Open the picker listing the detail pane's `related_issues` entries
    /// (tix #1513).
    ///
    /// `r` was free in the detail pane — the board's `r` is `refresh`, a
    /// different context, so the two never collide.
    RelatedPicker,
    /// Follow the detail pane's selected `related_issues` entry (tix #1513).
    ///
    /// `o` was free in the detail pane and reads as "open".
    FollowRelated,
    /// Pop the detail pane's navigation stack and restore the previous issue
    /// (tix #1513).
    ///
    /// `Backspace` was free in the detail pane and reads as "back".
    NavBack,
    Submit,
    Cancel,
    Next,
    Previous,
    OpenPicker,
    Reset,
    Toggle,
    AddColumn,
    /// Move the Config mode's selected board column one position earlier
    /// (`shift+k` by default, tui-config-mode).
    MoveColumnUp,
    /// Move the Config mode's selected board column one position later
    /// (`shift+j` by default, tui-config-mode).
    MoveColumnDown,
    NewPlanningItem,
    EditPlanningItem,
    DeletePlanningItem,
    Confirm,
    Create,
    PreviousYear,
    NextYear,
    PreviousMonth,
    NextMonth,
    Reedit,
    Ignore,
    /// Declare the repair prompt's undeclared frontmatter key in `tix.toml`
    /// (tix #1506).
    ///
    /// Its own action, not `confirm`: `confirm` applies whatever fix the prompt
    /// proposes, which *happens* to be the declaration for an unknown key, while
    /// `declare_key` always means "write it into `[custom_attributes]`" and says
    /// so when there is no key to declare.
    DeclareKey,
    /// Discard the repair prompt's retained copy, after a second confirmation
    /// (tix #1506).
    ///
    /// The **only** action that removes the editor's copy. The first press arms
    /// the prompt; a second press is the decision. `Esc` deliberately
    /// acknowledges and keeps the copy instead, so a stray key cannot destroy a
    /// user's edit.
    Discard,
    /// Switch the top-level shell to the Board mode (F1 by default).
    SwitchToBoard,
    /// Switch the top-level shell to the Triage mode (F2 by default).
    SwitchToTriage,
    /// Switch the top-level shell to the Cycle mode (F4 by default).
    SwitchToCycle,
    /// Switch the top-level shell to the Milestones mode (F5 by default).
    SwitchToMilestones,
    /// Switch the top-level shell to the Repos mode (F6 by default, tix #1529).
    ///
    /// F6 was free in the shell and sits directly after the milestone switch, so
    /// the repository list reads as the last of the managed registries.
    SwitchToRepos,
    /// Switch the top-level shell to the Stats page (F7 by default).
    ///
    /// F7 was reserved in the shell until this page existed; the Stats page takes it,
    /// and its first tab is Health (mission `project-issue-health-status-01M3C8HX`).
    SwitchToStats,
    /// Open the health form for the issue in the detail pane.
    ///
    /// One action, two layers: the form's own field chooses whether the value is the
    /// issue's `current` state or an `override` layered over its derived one, so a
    /// user does not have to learn two key paths that do the same thing with one
    /// field different.
    HealthForm,
    /// Open the add-entry form on the `F7` Stats page's **Time** tab (mission
    /// `per-issue-time-tracking-01M3C9A4`, WP05 T025).
    ///
    /// One of six keys the Time tab contributes to [`InputContext::Stats`]. The key
    /// opens a form and writes nothing; the form's `Enter` is the only path that
    /// reaches the shared time service, so a stray key cannot record an entry.
    TimeAdd,
    /// Open the correction form for the Time tab's selected entry (WP05 T025).
    TimeEdit,
    /// Open the deletion form for the Time tab's selected entry (WP05 T025).
    ///
    /// A deletion removes the entry from the issue's current projection; the form asks
    /// for a reason and a confirmation, and History keeps the prior value (C-003,
    /// C-004).
    TimeDelete,
    /// Edit the Time tab's scope: issue, assignee, period (WP05 T026).
    ///
    /// It edits the **shared** `TimeFilter` the CLI's `--issue/--assignee/--from/--to`
    /// build, so a filter has one grammar and one validator.
    TimeFilter,
    /// Cycle the Time tab's breakdown dimension: all, issue, assignee, date
    /// (WP05 T026).
    TimeBreakdown,
    /// Toggle the Time tab's audit view (WP05 T027): what the current projection no
    /// longer holds but History still attributes.
    TimeHistory,
    /// Switch to the F8 Schedule page (tix #1593).
    SwitchToSchedule,
    /// Generate the selected series' due occurrence (tix #1593).
    SeriesGenerate,
    /// Pause the selected series.
    SeriesPause,
    /// Resume the selected series.
    SeriesResume,
    /// End the selected series.
    SeriesEnd,
    /// Record the selected series' due date as skipped.
    SeriesSkip,
    /// Move the selected series' candidate past its due date.
    SeriesDefer,
    /// Stop offering the selected series' due date.
    SeriesIgnore,
    /// Define a new recurring series (tix #1593).
    ///
    /// The Series tab's `n`: it opens the page's create form, whose save reaches the
    /// same `tix recurring create` service the CLI runs, with the same rule and anchor
    /// parsing and the same validation order.
    SeriesNew,
    /// Switch to the F11 Library page (tix #1593).
    SwitchToLibrary,
    /// Switch to the F10 **Portfolio** page (WP06).
    ///
    /// F10 was reserved in the shell until this page existed; the Portfolio page's
    /// Projects tab takes it.
    SwitchToPortfolio,
    /// Switch the top-level shell to the New Issue mode (F1 by default).
    SwitchToNewIssue,
    /// Switch the top-level shell to the Config mode (F12 by default).
    SwitchToConfig,
    /// Cycle the vertical navigation display state `Off`/`Small`/`Default`.
    ToggleNavigation,
}

impl TuiAction {
    pub const fn as_str(self) -> &'static str {
        match self {
            Self::MoveUp => "move_up",
            Self::MoveDown => "move_down",
            Self::MoveLeft => "move_left",
            Self::MoveRight => "move_right",
            Self::NextBoard => "next_board",
            Self::PreviousBoard => "previous_board",
            Self::Open => "open",
            Self::Edit => "edit",
            Self::Agent => "agent",
            Self::View => "view",
            Self::ToggleColumn => "toggle_column",
            Self::OpenMentions => "open_mentions",
            Self::FilterModal => "filter_modal",
            Self::BulkModal => "bulk_modal",
            Self::Triage => "triage",
            Self::Views => "views",
            Self::ApplyView => "apply_view",
            Self::NewView => "new_view",
            Self::RenameView => "rename_view",
            Self::UpdateView => "update_view",
            Self::DuplicateView => "duplicate_view",
            Self::DeleteView => "delete_view",
            Self::Mark => "mark",
            Self::Unmark => "unmark",
            Self::ClearMarks => "clear_marks",
            Self::MovePrevious => "move_previous",
            Self::MoveNext => "move_next",
            Self::NewIssue => "new_issue",
            Self::CloneIssue => "clone_issue",
            Self::ToggleArchived => "toggle_archived",
            Self::ToggleChildren => "toggle_children",
            Self::Delete => "delete",
            Self::Refresh => "refresh",
            Self::Settings => "settings",
            Self::Planning => "planning",
            Self::NewBoard => "new_board",
            Self::Help => "help",
            Self::Quit => "quit",
            Self::TextFilter => "text_filter",
            Self::ReorderUp => "reorder_up",
            Self::ReorderDown => "reorder_down",
            Self::Close => "close",
            Self::ScrollUp => "scroll_up",
            Self::ScrollDown => "scroll_down",
            Self::ScrollLineDown => "scroll_line_down",
            Self::ScrollLineUp => "scroll_line_up",
            Self::ScrollTop => "scroll_top",
            Self::ScrollBottom => "scroll_bottom",
            Self::Comment => "comment",
            Self::Asset => "asset",
            Self::NewRelationship => "new_relationship",
            Self::EditRelationship => "edit_relationship",
            Self::RemoveRelationship => "remove_relationship",
            Self::EditParent => "edit_parent",
            Self::NextRelationship => "next_relationship",
            Self::PreviousRelationship => "previous_relationship",
            Self::RelatedPicker => "related_picker",
            Self::FollowRelated => "follow_related",
            Self::NavBack => "nav_back",
            Self::Submit => "submit",
            Self::Cancel => "cancel",
            Self::Next => "next",
            Self::Previous => "previous",
            Self::OpenPicker => "open_picker",
            Self::Reset => "reset",
            Self::Toggle => "toggle",
            Self::AddColumn => "add_column",
            Self::MoveColumnUp => "move_column_up",
            Self::MoveColumnDown => "move_column_down",
            Self::NewPlanningItem => "new_planning_item",
            Self::EditPlanningItem => "edit_planning_item",
            Self::DeletePlanningItem => "delete_planning_item",
            Self::Confirm => "confirm",
            Self::Create => "create",
            Self::PreviousYear => "previous_year",
            Self::NextYear => "next_year",
            Self::PreviousMonth => "previous_month",
            Self::NextMonth => "next_month",
            Self::Reedit => "reedit",
            Self::Ignore => "ignore",
            Self::DeclareKey => "declare_key",
            Self::Discard => "discard",
            Self::SwitchToBoard => "switch_to_board",
            Self::SwitchToTriage => "switch_to_triage",
            Self::SwitchToCycle => "switch_to_cycle",
            Self::SwitchToMilestones => "switch_to_milestones",
            Self::SwitchToRepos => "switch_to_repos",
            Self::SwitchToStats => "switch_to_stats",
            Self::HealthForm => "health_form",
            Self::TimeAdd => "time_add",
            Self::TimeEdit => "time_edit",
            Self::TimeDelete => "time_delete",
            Self::TimeFilter => "time_filter",
            Self::TimeBreakdown => "time_breakdown",
            Self::TimeHistory => "time_history",
            Self::SwitchToSchedule => "switch_to_schedule",
            Self::SeriesGenerate => "series_generate",
            Self::SeriesPause => "series_pause",
            Self::SeriesResume => "series_resume",
            Self::SeriesEnd => "series_end",
            Self::SeriesSkip => "series_skip",
            Self::SeriesDefer => "series_defer",
            Self::SeriesIgnore => "series_ignore",
            Self::SeriesNew => "series_new",
            Self::SwitchToLibrary => "switch_to_library",
            Self::SwitchToPortfolio => "switch_to_portfolio",
            Self::SwitchToNewIssue => "switch_to_new_issue",
            Self::SwitchToConfig => "switch_to_config",
            Self::ToggleNavigation => "toggle_navigation",
        }
    }

    pub const fn description(self) -> &'static str {
        match self {
            Self::MoveUp => "move up",
            Self::MoveDown => "move down",
            Self::MoveLeft => "previous column",
            Self::MoveRight => "next column",
            Self::NextBoard => "next board",
            Self::PreviousBoard => "previous board",
            Self::Open => "open detail",
            Self::Edit => "edit",
            Self::Agent => "open agent",
            Self::View => "view issue",
            Self::ToggleColumn => "toggle column",
            Self::FilterModal => "filter criteria",
            Self::BulkModal => "batch select",
            Self::Triage => "triage inbox",
            Self::OpenMentions => "mentions",
            Self::Views => "saved views",
            Self::ApplyView => "apply view",
            Self::NewView => "new view",
            Self::RenameView => "rename view",
            Self::UpdateView => "update view from live",
            Self::DuplicateView => "duplicate view",
            Self::DeleteView => "delete view",
            Self::Mark => "mark for batch",
            Self::Unmark => "unmark for batch",
            Self::ClearMarks => "clear marks",
            Self::MovePrevious => "move to previous column",
            Self::MoveNext => "move to next column",
            Self::NewIssue => "new issue",
            Self::CloneIssue => "clone issue",
            Self::ToggleArchived => "show archived issues",
            Self::ToggleChildren => "toggle sub-issues",
            Self::Delete => "delete",
            Self::Refresh => "refresh",
            Self::Settings => "settings",
            Self::Planning => "planning",
            Self::NewBoard => "new board",
            Self::Help => "help",
            Self::Quit => "quit",
            Self::TextFilter => "search",
            Self::ReorderUp => "reorder up",
            Self::ReorderDown => "reorder down",
            Self::Close => "close",
            Self::ScrollUp => "scroll up one page",
            Self::ScrollDown => "scroll down one page",
            Self::ScrollLineDown => "scroll down one line",
            Self::ScrollLineUp => "scroll up one line",
            Self::ScrollTop => "scroll to top",
            Self::ScrollBottom => "scroll to bottom",
            Self::Comment => "comment",
            Self::Asset => "asset",
            Self::NewRelationship => "new relationship",
            Self::EditRelationship => "edit relationship",
            Self::RemoveRelationship => "remove relationship",
            Self::EditParent => "set parent",
            Self::NextRelationship => "next relationship",
            Self::PreviousRelationship => "previous relationship",
            Self::RelatedPicker => "related issues",
            Self::FollowRelated => "follow related issue",
            Self::NavBack => "back",
            Self::Submit => "submit",
            Self::Cancel => "cancel",
            Self::Next => "next",
            Self::Previous => "previous",
            Self::OpenPicker => "open picker",
            Self::Reset => "reset",
            Self::Toggle => "toggle",
            Self::AddColumn => "add column",
            Self::MoveColumnUp => "move column up",
            Self::MoveColumnDown => "move column down",
            Self::NewPlanningItem => "new",
            Self::EditPlanningItem => "edit",
            Self::DeletePlanningItem => "delete",
            Self::Confirm => "confirm",
            Self::Create => "create",
            Self::PreviousYear => "previous year",
            Self::NextYear => "next year",
            Self::PreviousMonth => "previous month",
            Self::NextMonth => "next month",
            Self::Reedit => "re-edit",
            Self::Ignore => "ignore",
            Self::DeclareKey => "declare the key in tix.toml",
            Self::Discard => "discard the edit",
            Self::SwitchToBoard => "board mode",
            Self::SwitchToTriage => "triage mode",
            Self::SwitchToCycle => "cycle mode",
            Self::SwitchToMilestones => "milestones mode",
            Self::SwitchToRepos => "repos mode",
            Self::SwitchToStats => "the Stats page",
            Self::HealthForm => "record this issue's health",
            Self::TimeAdd => "add a time entry",
            Self::TimeEdit => "correct the selected entry",
            Self::TimeDelete => "delete the selected entry",
            Self::TimeFilter => "edit the time filter",
            Self::TimeBreakdown => "cycle the breakdown",
            Self::TimeHistory => "show the audit view",
            Self::SwitchToSchedule => "schedule mode",
            Self::SeriesGenerate => "generate the due occurrence",
            Self::SeriesPause => "pause the series",
            Self::SeriesResume => "resume the series",
            Self::SeriesEnd => "end the series",
            Self::SeriesSkip => "skip the due date",
            Self::SeriesDefer => "defer the due date",
            Self::SeriesIgnore => "ignore the due date",
            Self::SeriesNew => "create a new series",
            Self::SwitchToLibrary => "library mode",
            Self::SwitchToPortfolio => "portfolio mode",
            Self::SwitchToNewIssue => "new issue mode",
            Self::SwitchToConfig => "config mode",
            Self::ToggleNavigation => "toggle navigation",
        }
    }

    /// The wording this action gets in `context`'s help.
    ///
    /// `move_left`/`move_right` walk a **column** on the board, the Config
    /// mode's two **panes** (rail ⇄ body), and a **group** in the Cycle
    /// listing; `submit` steps into the body and then activates the row there.
    /// The action — and the key — is the same event, so only the noun the help
    /// shows changes. Every other action keeps its single description.
    pub const fn description_in(self, context: InputContext) -> &'static str {
        match (context, self) {
            (InputContext::Cycle, Self::MoveLeft) => "previous group",
            (InputContext::Cycle, Self::MoveRight) => "next group",
            // tix #1593: on the Library page the two directions step between its
            // registries, not between rows.
            (InputContext::Library, Self::Previous) => "previous tab",
            (InputContext::Library, Self::Next) => "next tab",
            (InputContext::Library, Self::Submit) => "apply the selected view",
            // WP05: both of the Stats page's tabs open the selected row's issue, so the
            // one description is honest for both — the Health tab has no other meaning
            // for `Enter`, and the Time tab's row names an entry that belongs to one.
            (InputContext::Stats, Self::Submit) => "open the row's issue",
            (InputContext::Settings, Self::MoveLeft) => "previous pane",
            (InputContext::Settings, Self::MoveRight) => "next pane",
            (InputContext::Settings, Self::Submit) => "step into the body / activate row",
            // The filter modal applies ad-hoc: a pick takes effect at once and
            // closing keeps it, so both exits mean "apply and close" and the generic
            // "cancel" would read as a discard that no longer exists.
            (InputContext::FilterModal, Self::OpenPicker) => "open the focused row's picker",
            (InputContext::FilterModal, Self::Submit) => "apply and close",
            (InputContext::FilterModal, Self::Cancel) => "apply and close",
            // #1506. Every key in the repair prompt is a decision about the file
            // the editor just produced, and "confirm"/"ignore" say nothing about
            // which one — the overlay has to spell out each.
            (InputContext::EditRepair, Self::Confirm) => "apply the proposed fix",
            (InputContext::EditRepair, Self::DeclareKey) => "declare the key in tix.toml",
            (InputContext::EditRepair, Self::Reedit) => "reopen the editor on the retained copy",
            (InputContext::EditRepair, Self::Ignore) => "acknowledge (keeps the copy)",
            (InputContext::EditRepair, Self::Discard) => "discard the edit (asks again)",
            // #1510. The conflict prompt reuses the edit warning's three actions:
            // each is the same *kind* of decision, so what the key means here is
            // what the wording has to spell out.
            (InputContext::EditConflict, Self::Confirm) => "overwrite the file with this edit",
            (InputContext::EditConflict, Self::Ignore) => "keep the on-disk version",
            (InputContext::EditConflict, Self::Reedit) => "compare in the editor",
            _ => self.description(),
        }
    }
}

pub type Binding = Vec<String>;

macro_rules! partial_bindings {
    ($($field:ident),+ $(,)?) => {
        #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
        #[serde(default, deny_unknown_fields)]
        pub struct ActionBindings {
            $(
                #[serde(skip_serializing_if = "Option::is_none")]
                pub $field: Option<Binding>,
            )+
        }
    };
}

partial_bindings!(
    // The mentions view (OpenSpec change `issue-mentions`): a rebindable board
    // action, so `[board] open_mentions = [...]` works like every other
    // board key and the bottom indicator row can read back the chord in force.
    open_mentions,
    move_up,
    move_down,
    move_left,
    move_right,
    next_board,
    previous_board,
    open,
    edit,
    agent,
    view,
    toggle_column,
    filter_modal,
    bulk_modal,
    triage,
    views,
    apply_view,
    new_view,
    rename_view,
    update_view,
    duplicate_view,
    delete_view,
    mark,
    unmark,
    clear_marks,
    move_previous,
    move_next,
    new_issue,
    clone_issue,
    toggle_archived,
    toggle_children,
    delete,
    refresh,
    settings,
    planning,
    new_board,
    help,
    quit,
    text_filter,
    reorder_up,
    reorder_down,
    close,
    scroll_up,
    scroll_down,
    comment,
    asset,
    edit_parent,
    submit,
    cancel,
    next,
    previous,
    open_picker,
    reset,
    toggle,
    add_column,
    move_column_up,
    move_column_down,
    new_planning_item,
    edit_planning_item,
    delete_planning_item,
    confirm,
    create,
    previous_year,
    next_year,
    previous_month,
    next_month,
    reedit,
    ignore,
    declare_key,
    discard,
    switch_to_board,
    switch_to_triage,
    switch_to_cycle,
    switch_to_milestones,
    switch_to_repos,
    switch_to_stats,
    health_form,
    // Mission `per-issue-time-tracking-01M3C9A4` (WP05): the Time tab's six keys, one
    // action each so every key is rebindable through `[stats]`, appears in
    // the help overlay, and has its own canonical event the handler can read.
    time_add,
    time_edit,
    time_delete,
    time_filter,
    time_breakdown,
    time_history,
    // tix #1593.
    switch_to_schedule,
    // tix #1593: the F8 Schedule page's seven keyed actions, one action each so
    // every key is rebindable, appears in the help overlay, and has its own
    // canonical event the handler can read.
    series_generate,
    series_pause,
    series_resume,
    series_end,
    series_skip,
    series_defer,
    series_ignore,
    series_new,
    // tix #1593.
    switch_to_library,
    switch_to_portfolio,
    switch_to_new_issue,
    switch_to_config,
    toggle_navigation,
);

macro_rules! keybindings_config {
    ($($field:ident => $context:ident),+ $(,)?) => {
        #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
        #[serde(default, deny_unknown_fields)]
        pub struct KeyBindings {
            $(
                #[serde(default, skip_serializing_if = "Option::is_none")]
                pub $field: Option<Box<ActionBindings>>,
            )+
        }

        impl KeyBindings {
            pub fn is_empty(&self) -> bool {
                self == &Self::default()
            }

            fn overrides(&self, context: InputContext) -> Option<&ActionBindings> {
                match context {
                    $(InputContext::$context => self.$field.as_deref(),)+
                }
            }
        }
    };
}

keybindings_config!(
    board => Board,
    rollover => Rollover,
    detail => Detail,
    form => Form,
    form_picker => FormPicker,
    confirm_delete => ConfirmDelete,
    confirm_blocked_move => ConfirmBlockedMove,
    help_search => HelpSearch,
    move_into_done => MoveIntoDone,
    help => Help,
    context_menu => ContextMenu,
    // #1513: the related-issues picker's own section, so its keys are rebindable
    // through `[related_picker]` like every other context's.
    related_picker => RelatedPicker,
    filter => Filter,
    filter_modal => FilterModal,
    bulk_modal => BulkModal,
    triage => Triage,
    cycle => Cycle,
    milestones => Milestones,
    // tix #1529: the F6 Repos mode's own section, so its keys are rebindable
    // through `[repos]` like every other context's.
    repos => Repos,
    // Mission `project-issue-health-status-01M3C8HX`: the F7 Stats page's own
    // section, so its keys are rebindable through `[stats]`.
    stats => Stats,
    // tix #1593: the F8 Schedule page's own section, so its keys are rebindable
    // through `[schedule]` like every other context's.
    schedule => Schedule,
    // tix #1593: the F11 Library page's own section, so its keys are rebindable
    // through `[library]` like every other context's.
    library => Library,
    // WP06: the F10 Portfolio page's own section, so its keys are rebindable
    // through `[portfolio]` like every other context's.
    portfolio => Portfolio,
    settings => Settings,
    settings_prompt => SettingsPrompt,
    planning_management => PlanningManagement,
    planning_confirm => PlanningConfirm,
    planning_form => PlanningForm,
    date_picker => DatePicker,
    comment => Comment,
    asset => Asset,
    edit_repair => EditRepair,
    edit_conflict => EditConflict,
    link_prompt => LinkPrompt,
    shell => Shell,
    views => Views,
    views_prompt => ViewsPrompt,
);

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct KeyChord {
    pub code: KeyCode,
    pub modifiers: KeyModifiers,
}

impl KeyChord {
    pub fn parse(value: &str) -> std::result::Result<Self, String> {
        let value = value.trim();
        if value.is_empty() {
            return Err("key chord must not be empty".into());
        }
        if value.chars().count() == 1 {
            let ch = value.chars().next().expect("value has one character");
            if ch.is_control() {
                return Err(format!("unsupported key name `{value}`"));
            }
            let modifiers = if ch.is_ascii_uppercase() {
                KeyModifiers::SHIFT
            } else {
                KeyModifiers::NONE
            };
            return Ok(Self {
                code: KeyCode::Char(ch),
                modifiers,
            });
        }
        let mut parts = value.split('+');
        let key = parts.next_back().ok_or("missing key name")?.trim();
        let mut modifiers = KeyModifiers::NONE;
        for part in parts {
            match part.trim().to_ascii_lowercase().as_str() {
                "ctrl" | "control" => modifiers |= KeyModifiers::CONTROL,
                "alt" | "option" => modifiers |= KeyModifiers::ALT,
                "shift" => modifiers |= KeyModifiers::SHIFT,
                "super" | "cmd" | "command" => modifiers |= KeyModifiers::SUPER,
                other => return Err(format!("unsupported modifier `{other}`")),
            }
        }
        if key.is_empty() {
            return Err("missing key name".into());
        }
        let mut code = match key.to_ascii_lowercase().as_str() {
            "backtab" => return Err("use shift+tab instead of `backtab`".into()),
            "shift+tab" => KeyCode::BackTab,
            "backspace" => KeyCode::Backspace,
            "tab" => KeyCode::Tab,
            "enter" | "return" => KeyCode::Enter,
            "esc" | "escape" => KeyCode::Esc,
            "space" => KeyCode::Char(' '),
            "left" => KeyCode::Left,
            "right" => KeyCode::Right,
            "up" => KeyCode::Up,
            "down" => KeyCode::Down,
            "home" => KeyCode::Home,
            "end" => KeyCode::End,
            "pageup" | "pgup" => KeyCode::PageUp,
            "pagedown" | "pgdn" | "pgdown" => KeyCode::PageDown,
            "delete" | "del" => KeyCode::Delete,
            "insert" | "ins" => KeyCode::Insert,
            _ => {
                if let Some(number) = key
                    .to_ascii_lowercase()
                    .strip_prefix('f')
                    .and_then(|n| n.parse::<u8>().ok())
                {
                    if (1..=12).contains(&number) {
                        KeyCode::F(number)
                    } else {
                        return Err(format!("unsupported function key `{key}`"));
                    }
                } else {
                    let mut chars = key.chars();
                    let Some(ch) = chars.next().filter(|_| chars.next().is_none()) else {
                        return Err(format!("unsupported key name `{key}`"));
                    };
                    if ch.is_control() {
                        return Err(format!("unsupported key name `{key}`"));
                    }
                    if ch.is_ascii_uppercase() {
                        modifiers |= KeyModifiers::SHIFT;
                    }
                    KeyCode::Char(ch)
                }
            }
        };
        if code == KeyCode::Tab && modifiers.contains(KeyModifiers::SHIFT) {
            code = KeyCode::BackTab;
            modifiers.remove(KeyModifiers::SHIFT);
        }
        if code == KeyCode::BackTab {
            modifiers |= KeyModifiers::SHIFT;
        }
        Ok(Self { code, modifiers })
    }

    pub fn matches(&self, event: KeyEvent) -> bool {
        if self.code != event.code {
            return false;
        }
        if self.modifiers.is_empty() {
            return event.modifiers.is_empty();
        }
        if self.code == KeyCode::BackTab {
            return event.modifiers.contains(KeyModifiers::SHIFT) || event.code == KeyCode::BackTab;
        }
        if let (KeyCode::Char(expected), KeyCode::Char(actual)) = (self.code, event.code) {
            let shift_expected = self.modifiers.contains(KeyModifiers::SHIFT);
            let normalized_expected = if shift_expected {
                expected.to_ascii_lowercase()
            } else {
                expected
            };
            let shift_actual =
                actual.is_uppercase() || event.modifiers.contains(KeyModifiers::SHIFT);
            let expected_other = self.modifiers.difference(KeyModifiers::SHIFT);
            let actual_other = event.modifiers.difference(KeyModifiers::SHIFT);
            return expected_other == actual_other
                && normalized_expected == actual.to_ascii_lowercase()
                && shift_expected == shift_actual;
        }
        event.modifiers == self.modifiers
    }

    pub fn display(&self) -> String {
        let mut out = String::new();
        if self.modifiers.contains(KeyModifiers::CONTROL) {
            out.push_str("Ctrl+");
        }
        if self.modifiers.contains(KeyModifiers::ALT) {
            out.push_str("Alt+");
        }
        if self.modifiers.contains(KeyModifiers::SUPER) {
            out.push_str("Super+");
        }
        if self.modifiers.contains(KeyModifiers::SHIFT) && self.code != KeyCode::BackTab {
            out.push_str("Shift+");
        }
        out.push_str(&match self.code {
            KeyCode::BackTab => "Shift+Tab".into(),
            KeyCode::Char(' ') => "Space".into(),
            KeyCode::Char(ch) => ch.to_string(),
            KeyCode::Enter => "Enter".into(),
            KeyCode::Esc => "Esc".into(),
            KeyCode::Left => "Left".into(),
            KeyCode::Right => "Right".into(),
            KeyCode::Up => "Up".into(),
            KeyCode::Down => "Down".into(),
            KeyCode::PageUp => "PgUp".into(),
            KeyCode::PageDown => "PgDn".into(),
            KeyCode::Delete => "Delete".into(),
            KeyCode::Insert => "Insert".into(),
            KeyCode::Home => "Home".into(),
            KeyCode::End => "End".into(),
            KeyCode::F(n) => format!("F{n}"),
            other => format!("{other:?}"),
        });
        out
    }
}

impl Serialize for KeyChord {
    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&self.display())
    }
}

impl<'de> Deserialize<'de> for KeyChord {
    fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let value = String::deserialize(deserializer)?;
        Self::parse(&value).map_err(D::Error::custom)
    }
}

impl fmt::Display for KeyChord {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter.write_str(&self.display())
    }
}

#[derive(Debug, Clone, Default, PartialEq, Eq)]
pub struct EffectiveBindings {
    modes: HashMap<InputContext, HashMap<TuiAction, Vec<KeyChord>>>,
}

impl KeyBindings {
    /// Load sparse TUI overrides from `tix_keybindings.toml` in `project_root`.
    ///
    /// A missing file is the default configuration, not an error. A present file
    /// deserializes directly into [`KeyBindings`], whose mode tables are sparse:
    /// omitted modes and actions overlay nothing and therefore keep their
    /// built-in chords.
    pub fn load(project_root: &Path) -> Result<Self> {
        let path = project_root.join(crate::keybindings::KEYBINDINGS_FILE);
        if !path.exists() {
            return Ok(Self::default());
        }
        let contents = std::fs::read_to_string(&path)
            .map_err(|error| TixError::Config(format!("{}: {error}", path.display())))?;
        let overrides: Self = toml::from_str(&contents)
            .map_err(|error| TixError::Config(format!("{}: {error}", path.display())))?;
        Ok(overrides)
    }

    /// Load the dedicated file and resolve it over the built-in defaults.
    pub fn load_effective(project_root: &Path) -> Result<EffectiveBindings> {
        Self::resolve(&Self::load(project_root)?)
    }

    pub fn resolve(overrides: &KeyBindings) -> Result<EffectiveBindings> {
        let mut effective = EffectiveBindings::default();
        for context in InputContext::ALL {
            let mut mode = default_mode(*context);
            if let Some(overrides) = overrides.overrides(*context) {
                overlay(&mut mode, overrides, *context)?;
            }
            effective.modes.insert(*context, mode);
        }
        Ok(effective)
    }
}

/// The dedicated, optional keybinding override file.
pub const KEYBINDINGS_FILE: &str = "tix_keybindings.toml";

impl EffectiveBindings {
    pub fn action(&self, context: InputContext, event: KeyEvent) -> Option<TuiAction> {
        self.modes
            .get(&context)?
            .iter()
            .find_map(|(action, chords)| {
                chords
                    .iter()
                    .any(|key| key.matches(event))
                    .then_some(*action)
            })
    }

    /// Every action this context binds, sorted by name so the order is stable.
    ///
    /// For the help overlay's completeness guard: that overlay's per-context action
    /// list is written by hand, and a binding it does not name is a key that works and
    /// that nobody can discover.
    pub fn bound_actions(&self, context: InputContext) -> Vec<TuiAction> {
        let mut actions: Vec<TuiAction> = self
            .modes
            .get(&context)
            .map(|mode| mode.keys().copied().collect())
            .unwrap_or_default();
        actions.sort_by_key(|action| action.as_str());
        actions
    }

    pub fn chords(&self, context: InputContext, action: TuiAction) -> &[KeyChord] {
        self.modes
            .get(&context)
            .and_then(|mode| mode.get(&action))
            .map(Vec::as_slice)
            .unwrap_or_default()
    }

    pub fn label(&self, context: InputContext, action: TuiAction) -> String {
        let labels: Vec<String> = self
            .chords(context, action)
            .iter()
            .map(ToString::to_string)
            .collect();
        if labels.is_empty() {
            "—".into()
        } else {
            labels.join(" / ")
        }
    }

    #[allow(clippy::too_many_lines)]
    pub fn canonical_event(&self, context: InputContext, action: TuiAction) -> KeyEvent {
        let (code, modifiers) = match (context, action) {
            (_, TuiAction::ReorderUp) => (KeyCode::Up, KeyModifiers::CONTROL),
            (_, TuiAction::ReorderDown) => (KeyCode::Down, KeyModifiers::CONTROL),
            (InputContext::Rollover, TuiAction::Previous) => (KeyCode::Tab, KeyModifiers::NONE),
            (InputContext::PlanningManagement, TuiAction::Next) => {
                (KeyCode::Tab, KeyModifiers::NONE)
            }
            (InputContext::FormPicker, TuiAction::Next) => (KeyCode::Up, KeyModifiers::NONE),
            (InputContext::FormPicker, TuiAction::Previous) => (KeyCode::Down, KeyModifiers::NONE),
            (InputContext::DatePicker, TuiAction::PreviousYear) => {
                (KeyCode::Char('['), KeyModifiers::NONE)
            }
            (InputContext::DatePicker, TuiAction::NextYear) => {
                (KeyCode::Char(']'), KeyModifiers::NONE)
            }
            (InputContext::DatePicker, TuiAction::PreviousMonth) => {
                (KeyCode::PageUp, KeyModifiers::NONE)
            }
            (InputContext::DatePicker, TuiAction::NextMonth) => {
                (KeyCode::PageDown, KeyModifiers::NONE)
            }
            (InputContext::DatePicker, TuiAction::Reset) => (KeyCode::Delete, KeyModifiers::NONE),
            // tix #1593: on the Library page `next`/`previous` step between the
            // two registries, so they must arrive as Tab/BackTab — the generic
            // arms below fold them into Down/Up, which the page's own `j`/`k`
            // already own and which would make the tab keys indistinguishable
            // from the row keys.
            (InputContext::Library, TuiAction::Next) => (KeyCode::Tab, KeyModifiers::NONE),
            (InputContext::Library, TuiAction::Previous) => (KeyCode::BackTab, KeyModifiers::NONE),
            // WP06: the Portfolio page reads two registries too, so its tab keys
            // must arrive as Tab/BackTab for the same reason — the generic arms
            // would fold them into Up/Down and make them indistinguishable from the
            // row keys.
            (InputContext::Portfolio, TuiAction::Next) => (KeyCode::Tab, KeyModifiers::NONE),
            (InputContext::Portfolio, TuiAction::Previous) => {
                (KeyCode::BackTab, KeyModifiers::NONE)
            }
            // WP05: the Stats page's two tabs switch on Tab/BackTab for the same
            // reason — the generic arms would fold them into Up/Down and make the tab
            // keys indistinguishable from the row keys, so `Tab` would stop switching.
            (InputContext::Stats, TuiAction::Next) => (KeyCode::Tab, KeyModifiers::NONE),
            (InputContext::Stats, TuiAction::Previous) => (KeyCode::BackTab, KeyModifiers::NONE),
            (InputContext::Settings, TuiAction::NewBoard) => {
                (KeyCode::Char('n'), KeyModifiers::NONE)
            }
            (InputContext::Settings, TuiAction::Delete) => (KeyCode::Char('x'), KeyModifiers::NONE),
            // #1441/#1442: `scroll_up`/`scroll_down` are **page** steps and must
            // canonicalize to themselves. The generic arms below fold them into
            // Up/Down, which is what made the detail pane's `PgUp`/`PgDn` arms dead
            // code: the key arrived canonicalized as `Down` and moved the
            // relationship cursor instead of scrolling, so a bound key did something
            // other than what it was bound to. These arms sit above the generics
            // because the match is top-down.
            (_, TuiAction::ScrollUp) => (KeyCode::PageUp, KeyModifiers::NONE),
            (_, TuiAction::ScrollDown) => (KeyCode::PageDown, KeyModifiers::NONE),
            // The line and end-of-body scrolls canonicalize to the keys their
            // handlers read, so `j`/`Down` both arrive as `Down` and `g`/`G` as
            // themselves (the detail pane's handler reads the canonical event).
            (_, TuiAction::ScrollLineDown) => (KeyCode::Down, KeyModifiers::NONE),
            (_, TuiAction::ScrollLineUp) => (KeyCode::Up, KeyModifiers::NONE),
            (_, TuiAction::ScrollTop) => (KeyCode::Char('g'), KeyModifiers::NONE),
            (_, TuiAction::ScrollBottom) => (KeyCode::Char('G'), KeyModifiers::NONE),
            (_, TuiAction::MoveUp | TuiAction::Previous) => (KeyCode::Up, KeyModifiers::NONE),
            (_, TuiAction::MoveDown | TuiAction::Next) => (KeyCode::Down, KeyModifiers::NONE),
            (_, TuiAction::MoveLeft) => (KeyCode::Left, KeyModifiers::NONE),
            (_, TuiAction::MoveRight) => (KeyCode::Right, KeyModifiers::NONE),
            (_, TuiAction::PreviousBoard) => (KeyCode::BackTab, KeyModifiers::NONE),
            (_, TuiAction::NextBoard) => (KeyCode::Tab, KeyModifiers::NONE),
            (_, TuiAction::Submit | TuiAction::Open | TuiAction::Ignore) => {
                (KeyCode::Enter, KeyModifiers::NONE)
            }
            (_, TuiAction::NewIssue) => (KeyCode::Char('n'), KeyModifiers::NONE),
            (_, TuiAction::CloneIssue) => (KeyCode::Char('C'), KeyModifiers::NONE),
            (_, TuiAction::ToggleArchived) => (KeyCode::Char('a'), KeyModifiers::NONE),
            (_, TuiAction::ToggleChildren) => (KeyCode::Char('u'), KeyModifiers::NONE),
            (_, TuiAction::Edit | TuiAction::EditPlanningItem) => {
                (KeyCode::Char('e'), KeyModifiers::NONE)
            }
            (_, TuiAction::Agent) => (KeyCode::Char('A'), KeyModifiers::NONE),
            // The board's `view` action is `V` (#1507): plain `v` there is the
            // saved-views modal, so the synthesized event must be the shifted
            // letter the board's own handler arm reads.
            (InputContext::Board, TuiAction::View) => (KeyCode::Char('V'), KeyModifiers::NONE),
            (_, TuiAction::View) => (KeyCode::Char('v'), KeyModifiers::NONE),
            (_, TuiAction::ToggleColumn | TuiAction::Comment) => {
                (KeyCode::Char('c'), KeyModifiers::NONE)
            }
            (_, TuiAction::FilterModal) => (KeyCode::Char('f'), KeyModifiers::NONE),
            (_, TuiAction::BulkModal) => (KeyCode::Char('B'), KeyModifiers::NONE),
            (_, TuiAction::Triage) => (KeyCode::Char('t'), KeyModifiers::NONE),
            // The mentions view's canonical event is the default chord the indicator
            // row advertises, so the board's own handler reads `i` whatever the user
            // rebound `open_mentions` to.
            (_, TuiAction::OpenMentions) => (KeyCode::Char('i'), KeyModifiers::NONE),
            // WP05. Each view action's canonical event is the key the modal's own
            // footer advertises, so a click region can synthesize exactly the key
            // the handler expects.
            (_, TuiAction::Views) => (KeyCode::Char('v'), KeyModifiers::NONE),
            (_, TuiAction::ApplyView) => (KeyCode::Enter, KeyModifiers::NONE),
            (_, TuiAction::NewView) => (KeyCode::Char('n'), KeyModifiers::NONE),
            (_, TuiAction::RenameView) => (KeyCode::Char('e'), KeyModifiers::NONE),
            (_, TuiAction::UpdateView) => (KeyCode::Char('u'), KeyModifiers::NONE),
            (_, TuiAction::DuplicateView) => (KeyCode::Char('d'), KeyModifiers::NONE),
            (_, TuiAction::DeleteView) => (KeyCode::Char('x'), KeyModifiers::NONE),
            (_, TuiAction::Mark) => (KeyCode::Char(' '), KeyModifiers::NONE),
            (_, TuiAction::Unmark) => (KeyCode::Char('x'), KeyModifiers::NONE),
            (_, TuiAction::ClearMarks) => (KeyCode::Char('X'), KeyModifiers::NONE),
            (_, TuiAction::MovePrevious) => (KeyCode::Char('<'), KeyModifiers::NONE),
            (_, TuiAction::MoveNext) => (KeyCode::Char('>'), KeyModifiers::NONE),
            (_, TuiAction::Delete) => (KeyCode::Char('d'), KeyModifiers::NONE),
            (_, TuiAction::DeletePlanningItem) => (KeyCode::Char('x'), KeyModifiers::NONE),
            (_, TuiAction::Refresh | TuiAction::Reset | TuiAction::Reedit) => {
                (KeyCode::Char('r'), KeyModifiers::NONE)
            }
            (_, TuiAction::Settings) => (KeyCode::Char('s'), KeyModifiers::NONE),
            (_, TuiAction::Planning) => (KeyCode::Char('m'), KeyModifiers::NONE),
            (_, TuiAction::NewPlanningItem) => (KeyCode::Char('n'), KeyModifiers::NONE),
            (_, TuiAction::NewBoard) => (KeyCode::Char('b'), KeyModifiers::NONE),
            (_, TuiAction::AddColumn) => (KeyCode::Char('a'), KeyModifiers::NONE),
            (_, TuiAction::MoveColumnUp) => (KeyCode::Char('K'), KeyModifiers::SHIFT),
            (_, TuiAction::MoveColumnDown) => (KeyCode::Char('J'), KeyModifiers::SHIFT),
            (_, TuiAction::Help) => (KeyCode::Char('?'), KeyModifiers::NONE),
            (_, TuiAction::Quit) => (KeyCode::Char('q'), KeyModifiers::NONE),
            (_, TuiAction::TextFilter) => (KeyCode::Char('/'), KeyModifiers::NONE),
            (_, TuiAction::Close | TuiAction::Cancel) => (KeyCode::Esc, KeyModifiers::NONE),
            (_, TuiAction::Asset) => (KeyCode::Char('a'), KeyModifiers::NONE),
            // #1359. `e` is the editor in the detail view, so re-kind is `E` — the
            // same relationship the CLI's `tix link edit <id>` changes.
            (_, TuiAction::NewRelationship) => (KeyCode::Char('n'), KeyModifiers::NONE),
            (_, TuiAction::EditRelationship) => (KeyCode::Char('E'), KeyModifiers::SHIFT),
            (_, TuiAction::RemoveRelationship) => (KeyCode::Char('d'), KeyModifiers::NONE),
            // #1384: hand the handler the key the footer advertises, not the
            // catch-all `Esc`.
            (_, TuiAction::EditParent) => (KeyCode::Char('P'), KeyModifiers::NONE),
            (_, TuiAction::NextRelationship) => (KeyCode::Tab, KeyModifiers::NONE),
            (_, TuiAction::PreviousRelationship) => (KeyCode::BackTab, KeyModifiers::NONE),
            // #1513. The three related-navigation actions hand the handler the
            // key they advertise — without these arms the generic catch-all
            // would fold them into `Esc`, and `o` on a related entry would close
            // the pane instead of following the link.
            (_, TuiAction::RelatedPicker) => (KeyCode::Char('r'), KeyModifiers::NONE),
            (_, TuiAction::FollowRelated) => (KeyCode::Char('o'), KeyModifiers::NONE),
            (_, TuiAction::NavBack) => (KeyCode::Backspace, KeyModifiers::NONE),
            (_, TuiAction::OpenPicker) => (KeyCode::F(2), KeyModifiers::NONE),
            // The shell's mode switches. `F(2)` is also `open_picker`'s canonical
            // event — they are different actions in different contexts, which is
            // exactly why mode switching is scoped to the shell context and a form's
            // `F2` keeps its picker meaning.
            (_, TuiAction::SwitchToBoard) => (KeyCode::F(3), KeyModifiers::NONE),
            (_, TuiAction::SwitchToTriage) => (KeyCode::F(2), KeyModifiers::NONE),
            (_, TuiAction::SwitchToCycle) => (KeyCode::F(4), KeyModifiers::NONE),
            (_, TuiAction::SwitchToMilestones) => (KeyCode::F(5), KeyModifiers::NONE),
            (_, TuiAction::SwitchToRepos) => (KeyCode::F(6), KeyModifiers::NONE),
            // Mission `project-issue-health-status-01M3C8HX` (WP06): F7 was reserved
            // in the shell until its page existed; the Stats page takes it.
            (_, TuiAction::SwitchToStats) => (KeyCode::F(7), KeyModifiers::NONE),
            // The health form's key. `handle_detail_key` reads raw keys, so its
            // canonical event must be that key: without this the default (`Esc`) is
            // what the handler sees, and the key meant to open the form would close
            // the pane instead.
            (_, TuiAction::HealthForm) => (KeyCode::Char('H'), KeyModifiers::NONE),
            // WP05: the Time tab's commands canonicalize to their own letters, so the
            // handler reads one event per action however the user rebound it. Without
            // these the catch-all would fold all six into `Esc` — closing the page
            // instead of acting.
            (_, TuiAction::TimeAdd) => (KeyCode::Char('a'), KeyModifiers::NONE),
            (_, TuiAction::TimeEdit) => (KeyCode::Char('e'), KeyModifiers::NONE),
            (_, TuiAction::TimeDelete) => (KeyCode::Char('x'), KeyModifiers::NONE),
            (_, TuiAction::TimeFilter) => (KeyCode::Char('f'), KeyModifiers::NONE),
            (_, TuiAction::TimeBreakdown) => (KeyCode::Char('s'), KeyModifiers::NONE),
            (_, TuiAction::TimeHistory) => (KeyCode::Char('H'), KeyModifiers::NONE),
            // tix #1593: F8 was free in the shell; the Schedule page takes it.
            (_, TuiAction::SwitchToSchedule) => (KeyCode::F(8), KeyModifiers::NONE),
            // The Schedule page's actions canonicalize to their own letters: the
            // handler reads the canonical event, so each action needs one.
            (_, TuiAction::SeriesGenerate) => (KeyCode::Char('g'), KeyModifiers::NONE),
            (_, TuiAction::SeriesPause) => (KeyCode::Char('p'), KeyModifiers::NONE),
            (_, TuiAction::SeriesResume) => (KeyCode::Char('r'), KeyModifiers::NONE),
            (_, TuiAction::SeriesEnd) => (KeyCode::Char('x'), KeyModifiers::NONE),
            (_, TuiAction::SeriesSkip) => (KeyCode::Char('s'), KeyModifiers::NONE),
            (_, TuiAction::SeriesDefer) => (KeyCode::Char('d'), KeyModifiers::NONE),
            (_, TuiAction::SeriesIgnore) => (KeyCode::Char('i'), KeyModifiers::NONE),
            // The Series tab's create key: the handler opens the form when it reads
            // this canonical event, so a rebind still lands there.
            (_, TuiAction::SeriesNew) => (KeyCode::Char('n'), KeyModifiers::NONE),
            // tix #1593: F11 was free in the shell; the Library page follows the
            // repos list.
            (_, TuiAction::SwitchToLibrary) => (KeyCode::F(11), KeyModifiers::NONE),
            // WP06: F10 was reserved in the shell; the Portfolio page takes it.
            (_, TuiAction::SwitchToPortfolio) => (KeyCode::F(10), KeyModifiers::NONE),
            (_, TuiAction::SwitchToNewIssue) => (KeyCode::F(1), KeyModifiers::NONE),
            (_, TuiAction::SwitchToConfig) => (KeyCode::F(12), KeyModifiers::NONE),
            (_, TuiAction::ToggleNavigation) => (KeyCode::Char('n'), KeyModifiers::CONTROL),
            (_, TuiAction::Toggle) => (KeyCode::Char(' '), KeyModifiers::NONE),
            (_, TuiAction::Confirm) => (KeyCode::Char('y'), KeyModifiers::NONE),
            // #1506. The repair prompt's own two decisions canonicalize to the
            // keys the prompt advertises, so `handle_edit_repair_key` reads a
            // canonical `d`/`x` however the user reached the action.
            (_, TuiAction::DeclareKey) => (KeyCode::Char('d'), KeyModifiers::NONE),
            (_, TuiAction::Discard) => (KeyCode::Char('x'), KeyModifiers::NONE),
            (_, TuiAction::Create) => (KeyCode::Char('+'), KeyModifiers::NONE),
            _ => (KeyCode::Esc, KeyModifiers::NONE),
        };
        KeyEvent::new(code, modifiers)
    }
}

impl ActionBindings {
    pub fn is_empty(&self) -> bool {
        self == &Self::default()
    }
}

#[cfg(test)]
mod tests;