tix-tracker 0.10.0

//! The issue **action menu**: one grouped, filterable list of everything that can
//! be done with the card under the board cursor.
//!
//! Opened by `Enter`, by a plain left click, and by right-click (which adds the
//! board footer), so the keyboard and the pointer read the same list. The widget
//! owns the query, the filtered order and the cursor; activation is App-owned and
//! routes through the same semantic action path the keyboard uses.
//!
//! Filtering follows the help overlay's rule exactly: literal substring first,
//! then `crate::search::fuzzy_score` as a fallback, with a `(fuzzy)` marker. The
//! tool therefore has one notion of "fuzzy", not a second one that behaves
//! almost the same.

use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
use ratatui::Frame;
use ratatui::layout::Rect;
use ratatui::style::{Color, Modifier, Style};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Borders, Clear, Paragraph};

/// Which block of the menu an entry belongs to.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ActionGroup {
    Move,
    Open,
    Content,
    Destructive,
    Marks,
    Triage,
    Board,
}

impl ActionGroup {
    pub const fn label(self) -> &'static str {
        match self {
            Self::Move => "Move",
            Self::Open => "Open",
            Self::Content => "Content",
            Self::Destructive => "Destructive",
            Self::Marks => "Batch",
            Self::Triage => "Triage",
            Self::Board => "Board",
        }
    }
}

/// What a menu entry runs.
///
/// Every variant is an *identity*: the App's one dispatcher turns it into the
/// same method a key press calls. Parameterised variants (`MoveTo`, `Mark`,
/// `Triage`) carry the target so the menu can name it.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum IssueAction {
    OpenDetail,
    EditInEditor,
    ViewIssue,
    OpenAgent,
    CloneIssue,
    OpenMentions,
    RelatedPicker,
    FollowRelated,
    MoveTo {
        column: String,
    },
    Comment,
    AttachAsset,
    NewRelationship,
    Relationships,
    EditRelationship {
        id: String,
    },
    RemoveRelationship {
        id: String,
    },
    SetParent,
    RecordHealth,
    AddTimeEntry,
    Archive,
    Restore,
    Delete,
    Mark {
        on: bool,
    },
    Bulk {
        action: crate::ui::bulk::BatchAction,
    },
    ClearMarks,
    Triage {
        decision: crate::triage::DecisionKind,
    },
    RefreshBoard,
}

/// One rendered entry: its semantic action, its label, its group, and the
/// effective shortcut when one exists.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ActionMenuItem {
    pub action: IssueAction,
    pub label: String,
    pub group: ActionGroup,
    pub shortcut: Option<String>,
    pub danger: bool,
}

impl ActionMenuItem {
    pub fn new(action: IssueAction, label: impl Into<String>, group: ActionGroup) -> Self {
        Self {
            action,
            label: label.into(),
            group,
            shortcut: None,
            danger: false,
        }
    }

    pub fn shortcut(mut self, shortcut: impl Into<String>) -> Self {
        self.shortcut = Some(shortcut.into());
        self
    }

    pub fn danger(mut self, danger: bool) -> Self {
        self.danger = danger;
        self
    }

    fn haystack(&self) -> String {
        let shortcut = self.shortcut.as_deref().unwrap_or("");
        format!("{} {} {}", self.group.label(), self.label, shortcut).to_lowercase()
    }
}

/// The outcome of routing a key event to the menu.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum MenuEvent {
    /// The key moved the cursor, changed the query, or was a no-op.
    None,
    /// The user dismissed the menu (`Esc` on the root page).
    Dismissed,
    /// The user confirmed an item; the index addresses the current page's items.
    Selected(usize),
}

/// One page of the menu. The root page is the issue's action list; a submenu is
/// pushed by an entry that has more than one target (relationships today).
#[derive(Debug, Clone)]
struct MenuPage {
    title: String,
    items: Vec<ActionMenuItem>,
    query: String,
    selected: usize,
    visible: Vec<usize>,
    fuzzy: bool,
}

impl MenuPage {
    fn new(title: impl Into<String>, items: Vec<ActionMenuItem>) -> Self {
        let mut page = Self {
            title: title.into(),
            items,
            query: String::new(),
            selected: 0,
            visible: Vec::new(),
            fuzzy: false,
        };
        page.refilter();
        page
    }

    fn refilter(&mut self) {
        let query = self.query.trim().to_lowercase();
        self.visible.clear();
        self.fuzzy = false;
        if query.is_empty() {
            self.visible.extend(0..self.items.len());
        } else {
            let literal: Vec<usize> = self
                .items
                .iter()
                .enumerate()
                .filter(|(_, item)| item.haystack().contains(&query))
                .map(|(index, _)| index)
                .collect();
            if literal.is_empty() {
                self.fuzzy = true;
                // Best first; `sort_by` is stable, so equal scores keep the
                // declared order — the order the menu is normally read in.
                let mut scored: Vec<(u32, usize)> = self
                    .items
                    .iter()
                    .enumerate()
                    .filter_map(|(index, item)| {
                        crate::search::fuzzy_score(&query, &item.haystack())
                            .map(|score| (score, index))
                    })
                    .collect();
                scored.sort_by_key(|(score, _)| std::cmp::Reverse(*score));
                self.visible
                    .extend(scored.into_iter().map(|(_, index)| index));
            } else {
                self.visible = literal;
            }
        }
        self.selected = self.selected.min(self.visible.len().saturating_sub(1));
    }

    fn selected_item(&self) -> Option<&ActionMenuItem> {
        self.visible
            .get(self.selected)
            .and_then(|index| self.items.get(*index))
    }

    fn move_by(&mut self, delta: i32) {
        if self.visible.is_empty() {
            return;
        }
        let last = self.visible.len() - 1;
        let next = self.selected as i32 + delta;
        self.selected = next.clamp(0, last as i32) as usize;
    }

    /// Rows in draw order: a group header, then its items.
    fn rows(&self) -> Vec<Row> {
        let mut rows = Vec::new();
        let mut last: Option<ActionGroup> = None;
        for index in &self.visible {
            let item = &self.items[*index];
            if last != Some(item.group) {
                rows.push(Row::Header(item.group));
                last = Some(item.group);
            }
            rows.push(Row::Item(*index));
        }
        rows
    }

    fn selected_index(&self) -> Option<usize> {
        self.visible.get(self.selected).copied()
    }
}

/// One drawn row of a page.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Row {
    Header(ActionGroup),
    Item(usize),
}

/// The action menu: a stack of pages, a query per page, and the last-drawn
/// window offset so pointer hit-testing agrees with what was rendered.
#[derive(Debug, Clone)]
pub struct ActionMenu {
    pages: Vec<MenuPage>,
    offset: std::cell::Cell<usize>,
}

impl ActionMenu {
    pub fn new(items: Vec<ActionMenuItem>) -> Self {
        let mut menu = Self {
            pages: vec![MenuPage::new("Actions", items)],
            offset: std::cell::Cell::new(0),
        };
        // `Open detail` is the preselected entry even though the Move group is
        // drawn first, so `Enter` `Enter` reproduces the old `Enter`.
        if let Some(page) = menu.pages.last_mut()
            && let Some(position) = page
                .visible
                .iter()
                .position(|index| page.items[*index].action == IssueAction::OpenDetail)
        {
            page.selected = position;
        }
        menu
    }

    fn page(&self) -> &MenuPage {
        self.pages.last().expect("action menu always has a page")
    }

    fn page_mut(&mut self) -> &mut MenuPage {
        self.pages
            .last_mut()
            .expect("action menu always has a page")
    }

    pub fn items(&self) -> &[ActionMenuItem] {
        &self.page().items
    }

    pub fn query(&self) -> &str {
        &self.page().query
    }

    pub fn is_fuzzy(&self) -> bool {
        self.page().fuzzy
    }

    pub fn visible_len(&self) -> usize {
        self.page().visible.len()
    }

    /// The cursor's position in the filtered list.
    pub fn selected_position(&self) -> usize {
        self.page().selected
    }

    pub fn selected_item(&self) -> Option<&ActionMenuItem> {
        self.page().selected_item()
    }

    pub fn item(&self, index: usize) -> Option<&ActionMenuItem> {
        self.page().items.get(index)
    }

    /// Push a submenu. Its own query starts empty, so the parent filter does not
    /// silently hide rows in a list the reader has not seen yet.
    pub fn push(&mut self, title: impl Into<String>, items: Vec<ActionMenuItem>) {
        self.pages.push(MenuPage::new(title, items));
        self.offset.set(0);
    }

    /// Return to the parent page. `false` when this is already the root.
    pub fn pop(&mut self) -> bool {
        if self.pages.len() <= 1 {
            return false;
        }
        self.pages.pop();
        self.offset.set(0);
        true
    }

    pub fn title(&self) -> &str {
        &self.page().title
    }

    pub fn handle_key(&mut self, key: KeyEvent) -> MenuEvent {
        match key.code {
            KeyCode::Esc => {
                if self.pop() {
                    MenuEvent::None
                } else {
                    MenuEvent::Dismissed
                }
            }
            KeyCode::Left if self.pop() => MenuEvent::None,
            KeyCode::Enter => self
                .page()
                .selected_index()
                .map(MenuEvent::Selected)
                .unwrap_or(MenuEvent::None),
            KeyCode::Up => {
                self.page_mut().move_by(-1);
                MenuEvent::None
            }
            KeyCode::Down => {
                self.page_mut().move_by(1);
                MenuEvent::None
            }
            KeyCode::PageUp => {
                self.page_mut().move_by(-8);
                MenuEvent::None
            }
            KeyCode::PageDown => {
                self.page_mut().move_by(8);
                MenuEvent::None
            }
            KeyCode::Backspace => {
                self.page_mut().query.pop();
                self.page_mut().selected = 0;
                self.page_mut().refilter();
                MenuEvent::None
            }
            KeyCode::Char('u') if key.modifiers.contains(KeyModifiers::CONTROL) => {
                self.page_mut().query.clear();
                self.page_mut().selected = 0;
                self.page_mut().refilter();
                MenuEvent::None
            }
            KeyCode::Char(c)
                if !key.modifiers.contains(KeyModifiers::CONTROL)
                    && !key.modifiers.contains(KeyModifiers::ALT) =>
            {
                self.page_mut().query.push(c);
                self.page_mut().selected = 0;
                self.page_mut().refilter();
                MenuEvent::None
            }
            _ => MenuEvent::None,
        }
    }

    /// The popup rect for `area`, size clamped to the content and the area.
    pub fn bounds(&self, area: Rect) -> Rect {
        let rows = self.page().rows();
        let width = rows
            .iter()
            .map(|row| match row {
                Row::Header(group) => group.label().chars().count(),
                Row::Item(index) => {
                    let item = &self.page().items[*index];
                    item.label.chars().count()
                        + item
                            .shortcut
                            .as_deref()
                            .map_or(0, |value| value.chars().count() + 2)
                }
            })
            .max()
            .unwrap_or(0)
            .max(self.title().chars().count())
            .saturating_add(6);
        // Borders + the footer line.
        let height = (rows.len() as u16 + 3).min(area.height);
        Rect::new(
            area.x + (area.width.saturating_sub(width as u16)) / 2,
            area.y + (area.height.saturating_sub(height)) / 2,
            (width as u16).min(area.width),
            height,
        )
    }

    /// The row list, shared by the renderer and the pointer handler.
    pub fn rows(&self) -> Vec<Row> {
        self.page().rows()
    }

    pub fn window_offset(&self) -> usize {
        self.offset.get()
    }

    /// The item under a terminal cell, if the cell is an item row.
    pub fn hit(&self, area: Rect, x: u16, y: u16) -> Option<usize> {
        let bounds = self.bounds(area);
        if x < bounds.x || x >= bounds.x + bounds.width {
            return None;
        }
        if y <= bounds.y || y >= bounds.y + bounds.height.saturating_sub(1) {
            return None;
        }
        let row = usize::from(y - bounds.y - 1) + self.offset.get();
        match self.rows().get(row) {
            Some(Row::Item(index)) => Some(*index),
            _ => None,
        }
    }

    /// Render the current page, keeping the selected item inside the window.
    pub fn render(&self, f: &mut Frame, area: Rect) {
        let rect = self.bounds(area);
        if rect.width < 6 || rect.height < 3 {
            return;
        }
        f.render_widget(Clear, rect);
        let rows = self.page().rows();
        let visible_rows = usize::from(rect.height.saturating_sub(3));
        let selected_index = self.page().selected_index();
        let selected_row = rows
            .iter()
            .position(|row| matches!(row, Row::Item(index) if Some(*index) == selected_index))
            .unwrap_or(0);
        let mut offset = self.offset.get();
        if selected_row < offset {
            offset = selected_row;
        } else if visible_rows > 0 && selected_row >= offset + visible_rows {
            offset = selected_row + 1 - visible_rows;
        }
        offset = offset.min(rows.len().saturating_sub(visible_rows));
        self.offset.set(offset);

        let inner = usize::from(rect.width.saturating_sub(2));
        let mut lines: Vec<Line<'static>> = Vec::new();
        for (row_index, row) in rows.iter().enumerate().skip(offset).take(visible_rows) {
            match row {
                Row::Header(group) => {
                    lines.push(Line::from(Span::styled(
                        group.label().to_ascii_uppercase(),
                        Style::default()
                            .fg(Color::Yellow)
                            .add_modifier(Modifier::BOLD),
                    )));
                }
                Row::Item(index) => {
                    let item = &self.page().items[*index];
                    let selected = row_index == selected_row;
                    let mut style = Style::default();
                    if item.danger {
                        style = style.fg(Color::Red);
                    }
                    if selected {
                        style = style
                            .bg(Color::DarkGray)
                            .fg(if item.danger {
                                Color::Red
                            } else {
                                Color::White
                            })
                            .add_modifier(Modifier::BOLD);
                    }
                    let shortcut = item.shortcut.clone().unwrap_or_default();
                    let gap = inner
                        .saturating_sub(item.label.chars().count())
                        .saturating_sub(shortcut.chars().count());
                    let mut spans = vec![
                        Span::styled(item.label.clone(), style),
                        Span::raw(" ".repeat(gap.max(1))),
                    ];
                    if !shortcut.is_empty() {
                        spans.push(Span::styled(shortcut, Style::default().fg(Color::DarkGray)));
                    }
                    lines.push(Line::from(spans));
                }
            }
        }
        let mut title = format!(" {} ", self.title());
        if !self.page().query.is_empty() {
            title.push_str(&format!(
                "— \"{}\"{} ",
                self.page().query,
                if self.page().fuzzy { " (fuzzy)" } else { "" }
            ));
        }
        lines.push(Line::from(Span::styled(
            format!(
                "{} action{} · type to filter · ↑/↓ move · Enter run · Esc close",
                self.page().visible.len(),
                if self.page().visible.len() == 1 {
                    ""
                } else {
                    "s"
                }
            ),
            Style::default().fg(Color::DarkGray),
        )));
        let block = Block::default()
            .borders(Borders::ALL)
            .title(title)
            .border_style(Style::default().fg(Color::Cyan));
        f.render_widget(Paragraph::new(lines).block(block), rect);
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn sample() -> Vec<ActionMenuItem> {
        vec![
            ActionMenuItem::new(
                IssueAction::MoveTo {
                    column: "done".into(),
                },
                "Move to done",
                ActionGroup::Move,
            ),
            ActionMenuItem::new(IssueAction::OpenDetail, "Open detail", ActionGroup::Open)
                .shortcut("enter"),
            ActionMenuItem::new(IssueAction::Comment, "Comment", ActionGroup::Content)
                .shortcut("c"),
            ActionMenuItem::new(IssueAction::Delete, "Delete", ActionGroup::Destructive)
                .shortcut("d")
                .danger(true),
        ]
    }

    fn key(code: KeyCode) -> KeyEvent {
        KeyEvent::new(code, KeyModifiers::NONE)
    }

    #[test]
    fn starts_on_open_detail_and_skips_headers_for_movement() {
        let mut menu = ActionMenu::new(sample());
        assert_eq!(
            menu.selected_item().map(|item| item.action.clone()),
            Some(IssueAction::OpenDetail),
            "Open detail is preselected even though Move is drawn first"
        );
        menu.handle_key(key(KeyCode::Up));
        assert_eq!(
            menu.selected_item().map(|item| item.action.clone()),
            Some(IssueAction::MoveTo {
                column: "done".into()
            }),
            "Up reaches the first drawn item"
        );
        menu.handle_key(key(KeyCode::Down));
        let _ = menu.handle_key(key(KeyCode::Down));
        menu.handle_key(key(KeyCode::Down));
        menu.handle_key(key(KeyCode::Down));
        assert_eq!(
            menu.selected_item().map(|item| item.action.clone()),
            Some(IssueAction::Delete)
        );
        menu.handle_key(key(KeyCode::Down));
        assert_eq!(
            menu.selected_item().map(|item| item.action.clone()),
            Some(IssueAction::Delete),
            "the last item stays selected"
        );
    }

    #[test]
    fn typing_filters_literally_and_then_fuzzily() {
        let mut menu = ActionMenu::new(sample());
        for c in "open".chars() {
            menu.handle_key(key(KeyCode::Char(c)));
        }
        assert_eq!(menu.visible_len(), 1);
        assert!(!menu.is_fuzzy());
        assert_eq!(
            menu.selected_item().map(|item| item.action.clone()),
            Some(IssueAction::OpenDetail)
        );

        let mut menu = ActionMenu::new(sample());
        for c in "opndt".chars() {
            menu.handle_key(key(KeyCode::Char(c)));
        }
        assert!(menu.is_fuzzy(), "a bare subsequence falls back to fuzzy");
        assert_eq!(
            menu.selected_item().map(|item| item.action.clone()),
            Some(IssueAction::OpenDetail)
        );
    }

    #[test]
    fn backspace_restores_the_list_and_esc_dismisses() {
        let mut menu = ActionMenu::new(sample());
        for c in "dele".chars() {
            menu.handle_key(key(KeyCode::Char(c)));
        }
        assert_eq!(menu.visible_len(), 1);
        menu.handle_key(key(KeyCode::Backspace));
        assert_eq!(menu.visible_len(), 1, "'dele' still matches only Delete");
        menu.handle_key(key(KeyCode::Backspace));
        menu.handle_key(key(KeyCode::Backspace));
        menu.handle_key(key(KeyCode::Backspace));
        assert_eq!(menu.handle_key(key(KeyCode::Backspace)), MenuEvent::None);
        assert_eq!(menu.visible_len(), 4);
        assert_eq!(menu.handle_key(key(KeyCode::Esc)), MenuEvent::Dismissed);
    }

    #[test]
    fn submenu_pops_back_to_the_parent() {
        let mut menu = ActionMenu::new(sample());
        menu.push(
            "Relationships",
            vec![ActionMenuItem::new(
                IssueAction::RemoveRelationship { id: "r1".into() },
                "Remove #1",
                ActionGroup::Content,
            )],
        );
        assert_eq!(menu.title(), "Relationships");
        assert!(menu.pop());
        assert_eq!(menu.title(), "Actions");
        assert!(!menu.pop());
    }

    #[test]
    fn the_selected_item_survives_filtering_when_possible() {
        let mut menu = ActionMenu::new(sample());
        menu.handle_key(key(KeyCode::Down));
        menu.handle_key(key(KeyCode::Down));
        menu.handle_key(key(KeyCode::Char('d')));
        assert!(menu.selected_item().is_some());
    }

    #[test]
    fn enter_selects_the_highlighted_item() {
        let mut menu = ActionMenu::new(sample());
        // Open detail is preselected; Down moves to the next item.
        menu.handle_key(key(KeyCode::Down));
        assert_eq!(menu.handle_key(key(KeyCode::Enter)), MenuEvent::Selected(2));
    }
}