gitlab-tracker 0.3.2

pub mod inspector;
pub mod table;

use crate::app::{ActivePane, App, InputMode, InspectorView, LogTimeField, SortColumn, SortOrder};
use ratatui::{
    layout::{Constraint, Direction, Layout, Rect},
    style::{Color, Modifier, Style, Stylize},
    text::{Line, Span},
    widgets::{Block, Borders, Clear, List, ListItem, ListState, Paragraph, Wrap},
    Frame,
};

/// Returns the border style to apply to a pane based on whether it is active.
///
/// Active pane gets a highlighted (cyan) border so the user knows where focus is.
fn pane_border_style(is_active: bool) -> Style {
    if is_active {
        Style::default().fg(Color::Cyan)
    } else {
        Style::default()
    }
}

pub fn render_ui(f: &mut Frame, app: &mut App) {
    let chunks = Layout::default()
        .constraints([Constraint::Min(3), Constraint::Length(3)])
        .split(f.area());

    let main_chunks = Layout::default()
        .direction(Direction::Horizontal)
        .constraints([Constraint::Percentage(65), Constraint::Percentage(35)])
        .split(chunks[0]);

    // --- Left Pane: Main Table ---
    // The table block highlights its border when it is the active pane.
    let table = table::render_table(app, main_chunks[0]);
    f.render_stateful_widget(table, main_chunks[0], &mut app.table_state);

    // --- Right Pane: Context Inspector Panel ---
    let inspector_is_active = app.active_pane == ActivePane::Inspector;
    let inspector_title = match (inspector_is_active, app.inspector_view) {
        (true, InspectorView::MrInfo) => " MR Inspector [FOCUS] │ [P]: Pipelines ",
        (false, InspectorView::MrInfo) => " MR Inspector │ [P]: Pipelines ",
        (true, InspectorView::Pipelines) => " Pipelines [FOCUS] │ [P]: Time Log ",
        (false, InspectorView::Pipelines) => " Pipelines │ [P]: Time Log ",
        (true, InspectorView::TimeLog) => " Time Log [FOCUS] │ [P]: MR Info │ [L]: Log Time ",
        (false, InspectorView::TimeLog) => " Time Log │ [P]: MR Info │ [L]: Log Time ",
    };
    let inspector_block = Block::default()
        .borders(Borders::ALL)
        .border_style(pane_border_style(inspector_is_active))
        .title(inspector_title);

    if let Some(selected) = app.table_state.selected() {
        if let Some(mr) = app.mrs.get(selected) {
            // Dispatch to the correct inspector view based on the current toggle state.
            let rendered_text = match app.inspector_view {
                InspectorView::MrInfo => inspector::render_safe_inspector_text(mr, &app.config),
                InspectorView::Pipelines => inspector::render_pipelines_text(mr),
                InspectorView::TimeLog => inspector::render_time_log_text(mr, &app.time_entries),
            };

            // Update content/pane dimensions so scroll clamping in App is accurate.
            // Inner height removes the 2 border rows (top + bottom).
            app.inspector_content_lines = rendered_text.lines.len() as u16;
            app.inspector_pane_height = main_chunks[1].height.saturating_sub(2);

            let inspector_paragraph = Paragraph::new(rendered_text)
                .block(inspector_block)
                .wrap(Wrap { trim: false })
                .scroll((app.inspector_scroll, 0));
            f.render_widget(inspector_paragraph, main_chunks[1]);
        } else {
            let inspector_paragraph =
                Paragraph::new("Selected metadata unavailable.").block(inspector_block);
            f.render_widget(inspector_paragraph, main_chunks[1]);
        }
    } else {
        let inspector_paragraph = Paragraph::new(
            "Select an active Merge Request row to display side inspector panels context.",
        )
        .block(inspector_block)
        .dark_gray();
        f.render_widget(inspector_paragraph, main_chunks[1]);
    };

    let sort_status = match (app.sort_column, app.sort_order) {
        (SortColumn::UpdatedAt, SortOrder::Ascending) => "Sort: Updated ▲",
        (SortColumn::UpdatedAt, SortOrder::Descending) => "Sort: Updated ▼",
        (SortColumn::Id, SortOrder::Ascending) => "Sort: ID ▲",
        (SortColumn::Id, SortOrder::Descending) => "Sort: ID ▼",
        (SortColumn::Milestone, SortOrder::Ascending) => "Sort: Milestone ▲",
        (SortColumn::Milestone, SortOrder::Descending) => "Sort: Milestone ▼",
        (SortColumn::Title, SortOrder::Ascending) => "Sort: Title ▲",
        (SortColumn::Title, SortOrder::Descending) => "Sort: Title ▼",
    };

    // --- Bottom Input Bar ---
    let pane_hint = match app.active_pane {
        ActivePane::Dashboard => "Pane: Dashboard",
        ActivePane::Inspector => "Pane: Inspector",
    };
    // The input bar title and border change depending on whether the field has focus.
    let (input_title, input_border_style) = match app.input_mode {
        InputMode::Editing if !app.milestone_suggestions.is_empty() => (
            " MILESTONE │ [↑/↓ Tab]: Navigate │ [Enter]: Bulk-add MRs │ [Esc]: Close ".to_string(),
            Style::default().fg(Color::Yellow),
        ),
        InputMode::Editing => (
            " INSERT │ MR ID, branch name, or @milestone │ [Enter]: Confirm │ [Esc]: Cancel ".to_string(),
            Style::default().fg(Color::Yellow),
        ),
        InputMode::ColumnPicker => (
            " COLUMNS │ [↑/↓]: Navigate │ [Space]: Toggle │ [Esc]: Close & Save ".to_string(),
            Style::default().fg(Color::Cyan),
        ),
        InputMode::Normal => (
            format!(
                " [i] or [/]: Insert mode │ [Tab]: {} │ [S/s]: {} │ [F]: Filter │ [Space]: Flag │ [C]: Columns │ [▲/▼]: Scroll │ [O]: Open │ [R]: Refresh │ [Del]: Delete │ [Esc]: Quit ",
                pane_hint, sort_status
            ),
            Style::default(),
        ),
        // The Log Time popup handles its own rendering — the input bar is hidden behind it.
        // We still need to cover this arm to satisfy exhaustiveness.
        InputMode::LogTime => (
            " LOG TIME │ [Tab]: Next field │ [Enter]: Submit │ [Esc]: Cancel ".to_string(),
            Style::default().fg(Color::Magenta),
        ),
    };

    let input_box = Paragraph::new(app.input.as_str()).block(
        Block::default()
            .borders(Borders::ALL)
            .border_style(input_border_style)
            .title(input_title),
    );
    f.render_widget(input_box, chunks[1]);

    // Render the column-picker popup on top of the UI when active.
    if app.input_mode == InputMode::ColumnPicker {
        render_column_picker(f, app, f.area());
    }

    // Render the milestone autocomplete dropdown above the input bar when suggestions exist.
    if app.input_mode == InputMode::Editing && !app.milestone_suggestions.is_empty() {
        render_milestone_autocomplete(f, app, chunks[1]);
    }

    // Render the Log Time popup on top of everything when active.
    if app.input_mode == InputMode::LogTime {
        render_log_time_popup(f, app, f.area());
    }
}

/// Renders the Log Time popup centred over the terminal.
///
/// The popup is a modal overlay using [`Clear`] so it erases whatever is beneath.
/// Layout (top→bottom):
///   1. Duration text field
///   2. Activity selector list (scrollable)
///   3. Comment text field
///   4. Error line (when present) + shortcut hint
fn render_log_time_popup(f: &mut Frame, app: &App, area: Rect) {
    use ratatui::widgets::List;

    // Ticket context for the popup title.
    let ticket_label = app
        .table_state
        .selected()
        .and_then(|i| app.visible_mrs().nth(i))
        .and_then(|mr| mr.linked_ticket.as_ref())
        .map(|t| format!(" ⏱  Log Time — #{} ", t.id))
        .unwrap_or_else(|| " ⏱  Log Time ".to_string());

    // Fixed popup dimensions.
    let popup_width: u16 = 60;
    // Base height: title(1) + duration(3) + activity list (up to 6 visible) + comment(3) +
    // error/hint(2) + borders(2) = 17 rows max
    let activity_rows = (app.activities.len() as u16).clamp(2, 6);
    let popup_height: u16 = 3 + activity_rows + 3 + 2 + 2;

    let popup_x = area.x + area.width.saturating_sub(popup_width) / 2;
    let popup_y = area.y + area.height.saturating_sub(popup_height) / 2;
    let popup_area = Rect::new(popup_x, popup_y, popup_width, popup_height);

    f.render_widget(Clear, popup_area);

    // Outer border block.
    let outer_block = Block::default()
        .borders(Borders::ALL)
        .border_style(Style::default().fg(Color::Magenta))
        .title(Span::styled(
            ticket_label,
            Style::default()
                .fg(Color::Magenta)
                .add_modifier(Modifier::BOLD),
        ));
    f.render_widget(outer_block, popup_area);

    // Inner layout: split vertically into 4 zones inside the border.
    let inner = Rect::new(
        popup_area.x + 1,
        popup_area.y + 1,
        popup_area.width.saturating_sub(2),
        popup_area.height.saturating_sub(2),
    );

    let zones = Layout::default()
        .direction(Direction::Vertical)
        .constraints([
            Constraint::Length(3),             // Duration field
            Constraint::Length(activity_rows), // Activity selector
            Constraint::Length(3),             // Comment field
            Constraint::Min(1),                // Error / hint line
        ])
        .split(inner);

    // Helper: border colour based on whether the field is focused.
    let field_style = |focused: bool| -> Style {
        if focused {
            Style::default().fg(Color::Yellow)
        } else {
            Style::default().fg(Color::DarkGray)
        }
    };

    // ── Duration field ────────────────────────────────────────────────────────
    let duration_focused = app.log_time_form.focused_field == LogTimeField::Duration;
    let duration_block = Block::default()
        .borders(Borders::ALL)
        .border_style(field_style(duration_focused))
        .title(Span::styled(
            " Duration (e.g. 1h30, 90m, 1.5h) ",
            Style::default().fg(Color::White),
        ));
    let duration_widget = Paragraph::new(app.log_time_form.duration_input.as_str())
        .block(duration_block)
        .style(Style::default().fg(Color::White));
    f.render_widget(duration_widget, zones[0]);

    // ── Activity selector ─────────────────────────────────────────────────────
    let activity_focused = app.log_time_form.focused_field == LogTimeField::Activity;
    let activity_block = Block::default()
        .borders(Borders::ALL)
        .border_style(field_style(activity_focused))
        .title(Span::styled(
            " Activity [↑/↓] ",
            Style::default().fg(Color::White),
        ));

    if app.activities.is_empty() {
        let loading = Paragraph::new("Loading activities…")
            .block(activity_block)
            .style(Style::default().fg(Color::DarkGray));
        f.render_widget(loading, zones[1]);
    } else {
        let cursor = app.log_time_form.selected_activity_idx;
        let visible = activity_rows as usize;
        let scroll_offset = if cursor >= visible {
            cursor + 1 - visible
        } else {
            0
        };

        let items: Vec<ListItem> = app
            .activities
            .iter()
            .enumerate()
            .skip(scroll_offset)
            .take(visible)
            .map(|(i, act)| {
                let selected = i == cursor;
                let style = if selected {
                    Style::default()
                        .fg(Color::Black)
                        .bg(Color::Magenta)
                        .add_modifier(Modifier::BOLD)
                } else {
                    Style::default().fg(Color::White)
                };
                ListItem::new(Line::from(Span::styled(format!("  {} ", act.name), style)))
            })
            .collect();

        let list = List::new(items).block(activity_block);
        let mut list_state = ratatui::widgets::ListState::default();
        list_state.select(Some(cursor.saturating_sub(scroll_offset)));
        f.render_stateful_widget(list, zones[1], &mut list_state);
    }

    // ── Comment field ─────────────────────────────────────────────────────────
    let comment_focused = app.log_time_form.focused_field == LogTimeField::Comment;
    let comment_block = Block::default()
        .borders(Borders::ALL)
        .border_style(field_style(comment_focused))
        .title(Span::styled(
            " Comment (optional) ",
            Style::default().fg(Color::White),
        ));
    let comment_widget = Paragraph::new(app.log_time_form.comment_input.as_str())
        .block(comment_block)
        .style(Style::default().fg(Color::White));
    f.render_widget(comment_widget, zones[2]);

    // ── Error / hint line ─────────────────────────────────────────────────────
    let bottom_line = if let Some(err) = &app.log_time_form.error {
        Line::from(vec![
            Span::styled(
                " ✘ ",
                Style::default().fg(Color::Red).add_modifier(Modifier::BOLD),
            ),
            Span::styled(err.clone(), Style::default().fg(Color::Red)),
        ])
    } else if app.log_time_form.submitting {
        Line::from(vec![Span::styled(
            " ⟳ Submitting…",
            Style::default().fg(Color::Yellow),
        )])
    } else {
        Line::from(vec![
            Span::styled(" [Tab] ", Style::default().fg(Color::DarkGray)),
            Span::styled("Next field  ", Style::default().fg(Color::DarkGray)),
            Span::styled("[Enter] ", Style::default().fg(Color::DarkGray)),
            Span::styled("Submit  ", Style::default().fg(Color::DarkGray)),
            Span::styled("[Esc] ", Style::default().fg(Color::DarkGray)),
            Span::styled("Cancel", Style::default().fg(Color::DarkGray)),
        ])
    };
    f.render_widget(Paragraph::new(bottom_line), zones[3]);
}

/// Renders the milestone autocomplete dropdown just above the input bar.
///
/// The popup lists all matching milestone suggestions and highlights the currently
/// selected one. It is anchored to the left edge of the input bar and grows upward
/// so it never overlaps the input field itself.
fn render_milestone_autocomplete(f: &mut Frame, app: &App, input_area: Rect) {
    let suggestions = &app.milestone_suggestions;
    if suggestions.is_empty() {
        return;
    }

    // Cap visible rows to avoid overflowing the screen.
    let max_visible: u16 = 8;
    let visible_count = (suggestions.len() as u16).min(max_visible);
    // +2 for top/bottom borders.
    let popup_height = visible_count + 2;
    let popup_width = (input_area.width / 2).max(40);

    // Anchor to the left of the input bar and grow upward.
    let popup_x = input_area.x;
    let popup_y = input_area.y.saturating_sub(popup_height);
    let popup_area = Rect::new(popup_x, popup_y, popup_width, popup_height);

    f.render_widget(Clear, popup_area);

    // Determine the scroll offset so the selected item is always visible.
    let cursor = app.milestone_suggestion_cursor;
    let scroll_offset = if cursor >= max_visible as usize {
        cursor + 1 - max_visible as usize
    } else {
        0
    };

    let items: Vec<ListItem> = suggestions
        .iter()
        .enumerate()
        .skip(scroll_offset)
        .take(max_visible as usize)
        .map(|(i, title)| {
            let is_selected = i == cursor;
            let style = if is_selected {
                Style::default()
                    .fg(Color::Black)
                    .bg(Color::Yellow)
                    .add_modifier(Modifier::BOLD)
            } else {
                Style::default().fg(Color::White)
            };
            ListItem::new(Line::from(Span::styled(format!("  {} ", title), style)))
        })
        .collect();

    let list = List::new(items).block(
        Block::default()
            .borders(Borders::ALL)
            .border_style(Style::default().fg(Color::Yellow))
            .title(" Milestones │ [↑/↓ Tab]: Navigate │ [Enter]: Select "),
    );

    let mut list_state = ListState::default();
    list_state.select(Some(cursor.saturating_sub(scroll_offset)));
    f.render_stateful_widget(list, popup_area, &mut list_state);
}

/// Renders the column-picker popup centred over the terminal area.
///
/// The popup is overlaid via [`Clear`] so it erases whatever is beneath it.
/// Arrow keys move the cursor; Space toggles the highlighted entry.
fn render_column_picker(f: &mut Frame, app: &App, area: Rect) {
    // The popup entries mirror the fields of `VisibleColumns` in declaration order.
    // The "Tracker" entry is appended only when a tracker provider is configured at runtime.
    let mut entries_vec: Vec<(&str, bool)> = vec![
        ("Activity", app.config.visible_columns.activity),
        ("Target branch", app.config.visible_columns.target_branch),
        ("Labels", app.config.visible_columns.labels),
        ("Milestone", app.config.visible_columns.milestone),
        ("Notes", app.config.visible_columns.notes),
    ];
    if app.tracker.is_some() {
        entries_vec.push(("Tracker", app.config.visible_columns.tracker_ticket));
    }
    let entries: &[(&str, bool)] = &entries_vec;

    // Fixed popup size: wide enough for the longest label + checkbox, tall enough for all rows.
    let popup_width: u16 = 36;
    let popup_height: u16 = entries.len() as u16 + 2; // +2 for top/bottom borders

    // Centre the popup within the terminal area.
    let popup_x = area.x + area.width.saturating_sub(popup_width) / 2;
    let popup_y = area.y + area.height.saturating_sub(popup_height) / 2;
    let popup_area = Rect::new(popup_x, popup_y, popup_width, popup_height);

    // Erase the background behind the popup.
    f.render_widget(Clear, popup_area);

    let items: Vec<ListItem> = entries
        .iter()
        .enumerate()
        .map(|(i, (label, enabled))| {
            let checkbox = if *enabled { "☑" } else { "☐" };
            let is_selected = i == app.column_picker_cursor;
            let style = if is_selected {
                Style::default()
                    .fg(Color::Black)
                    .bg(Color::Cyan)
                    .add_modifier(Modifier::BOLD)
            } else {
                Style::default().fg(Color::White)
            };
            ListItem::new(Line::from(vec![
                Span::styled(format!("  {} ", checkbox), style),
                Span::styled(label.to_string(), style),
            ]))
        })
        .collect();

    let list = List::new(items).block(
        Block::default()
            .borders(Borders::ALL)
            .border_style(Style::default().fg(Color::Cyan))
            .title(" Columns "),
    );

    let mut list_state = ListState::default();
    list_state.select(Some(app.column_picker_cursor));
    f.render_stateful_widget(list, popup_area, &mut list_state);
}