par-term 0.29.0

use crate::app::window_state::WindowState;
use crate::url_detection;
use std::sync::Arc;
use winit::event::{ElementState, MouseButton};

impl WindowState {
    pub(crate) fn handle_mouse_button(&mut self, button: MouseButton, state: ElementState) {
        // Get mouse position from active tab for shader interaction
        let mouse_position = self
            .tab_manager
            .active_tab()
            .map(|t| t.active_mouse().position)
            .unwrap_or((0.0, 0.0));

        let suppress_terminal_mouse_click = self
            .should_suppress_terminal_mouse_click_for_image_guard(button, state, mouse_position);

        // On left button release, always clear button_pressed and end any active selection
        // drag BEFORE any early returns so that state stays consistent when the release
        // lands in the tab bar, profile drawer, or context menu (all of which return early
        // without reaching the normal cleanup further below).
        //
        // Without button_pressed=false: dragging_divider can stay set and the next
        // mouse-move would continue phantom-dragging the divider with the button up.
        //
        // Without is_selecting=false: if the user dragged from the terminal into the tab
        // bar and released there, handle_left_mouse_release is never called, leaving
        // is_selecting=true and a visible selection highlight until the next terminal click.
        if button == MouseButton::Left
            && state == ElementState::Released
            && let Some(tab) = self.tab_manager.active_tab_mut()
        {
            tab.active_mouse_mut().button_pressed = false;
            tab.selection_mouse_mut().is_selecting = false;
        }

        // Check if profile drawer is open - let egui handle all mouse events
        if self.overlay_ui.profile_drawer_ui.expanded {
            self.request_redraw();
            return;
        }

        // Check if click is on the profile drawer toggle button
        let in_toggle_button = self.with_window(|window| {
            let size = window.inner_size();
            self.overlay_ui.profile_drawer_ui.is_point_in_toggle_button(
                mouse_position.0 as f32,
                mouse_position.1 as f32,
                size.width as f32,
                size.height as f32,
            )
        });
        if in_toggle_button == Some(true) {
            // Let egui handle the toggle button click
            self.request_redraw();
            return;
        }

        // Check if click is in the tab bar area - if so, let egui handle it
        // IMPORTANT: Do this BEFORE setting button_pressed to avoid selection state issues
        if self.is_mouse_in_tab_bar(mouse_position) {
            // Request redraw so egui can process the click event
            self.request_redraw();
            return; // Click is on tab bar, don't process as terminal event
        }

        // Check if tab context menu is open - if so, let egui handle all clicks.
        // Request a redraw so egui can process click-away dismissal immediately.
        if self.tab_bar_ui.is_context_menu_open() {
            self.request_redraw();
            return;
        }

        // --- 1. Shader Interaction ---
        // Update shader mouse state for left button (matches Shadertoy iMouse convention)
        if button == MouseButton::Left
            && let Some(ref mut renderer) = self.renderer
        {
            renderer.set_shader_mouse_button(
                state == ElementState::Pressed,
                mouse_position.0 as f32,
                mouse_position.1 as f32,
            );
        }

        match button {
            MouseButton::Left => {
                self.handle_left_mouse_button(state, mouse_position, suppress_terminal_mouse_click);
            }
            MouseButton::Middle => {
                // When middle_click_paste is enabled, paste takes priority over mouse
                // tracking — matching iTerm2 behaviour. This prevents the common case
                // where middle-click silently forwards a mouse event to a TUI app (vim,
                // less, etc.) instead of pasting, causing apparent "different content"
                // compared to Cmd+V.
                if self.config.middle_click_paste {
                    if state == ElementState::Pressed
                        && let Some(text) = self.input_handler.paste_from_primary_selection()
                        && let Some(tab) = self.tab_manager.active_tab()
                    {
                        let text = crate::paste_transform::sanitize_paste_content(&text);
                        let terminal_clone = Arc::clone(&tab.terminal);

                        // Get click cell coordinates to send a focus-click to tmux
                        // (or any other app with mouse tracking enabled).  We encode
                        // a synthetic left-press + left-release at the click position
                        // so tmux moves focus to the clicked pane before the paste
                        // text arrives — matching iTerm2's behaviour.
                        let click_cell = if let Some(ref pm) = tab.pane_manager
                            && let Some(focused_pane) = pm.focused_pane()
                        {
                            self.pixel_to_pane_cell(
                                mouse_position.0,
                                mouse_position.1,
                                &focused_pane.bounds,
                            )
                        } else {
                            self.pixel_to_cell(mouse_position.0, mouse_position.1)
                        };

                        self.runtime.spawn(async move {
                            let term = terminal_clone.write().await;

                            // If mouse tracking is active (e.g., tmux with mouse on),
                            // send a left-click press then release at the cursor
                            // position to focus the pane before the paste lands.
                            if term.is_mouse_tracking_enabled()
                                && let Some((col, row)) = click_cell
                            {
                                let press = term.encode_mouse_event(0, col, row, true, 0);
                                let release = term.encode_mouse_event(0, col, row, false, 0);
                                if !press.is_empty() {
                                    let _ = term.write(&press);
                                }
                                if !release.is_empty() {
                                    let _ = term.write(&release);
                                }
                            }

                            let _ = term.paste(&text);
                        });
                    }
                    // Don't forward the middle button press/release itself to mouse
                    // tracking: the button is reserved for paste when this option is
                    // enabled (sending it would also trigger tmux's own paste-buffer).
                } else {
                    // Paste disabled — forward to terminal if mouse tracking is active.
                    self.try_send_mouse_event(1, state == ElementState::Pressed);
                }
            }
            MouseButton::Right => {
                // Try to send to terminal if mouse tracking is enabled
                let _ = self.try_send_mouse_event(2, state == ElementState::Pressed);
                // Event consumed by terminal (or ignored)
            }
            _ => {}
        }
    }

    fn handle_left_mouse_button(
        &mut self,
        state: ElementState,
        mouse_position: (f64, f64),
        suppress_terminal_mouse_click: bool,
    ) {
        // --- 2. URL Clicking ---
        // Check for modifier+Click on URL to open it in default browser
        // macOS: Cmd+Click (matches iTerm2 and system conventions)
        // Windows/Linux: Ctrl+Click (matches platform conventions)
        #[cfg(target_os = "macos")]
        let url_modifier_pressed = self.input_handler.modifiers.state().super_key();
        #[cfg(not(target_os = "macos"))]
        let url_modifier_pressed = self.input_handler.modifiers.state().control_key();

        // Use pane-local coordinates when split panes are active so the col/row
        // match the URL positions detected from the focused pane's terminal.
        let click_cell = self
            .tab_manager
            .active_tab()
            .and_then(|tab| {
                tab.pane_manager.as_ref().and_then(|pm| {
                    pm.focused_pane().and_then(|pane| {
                        self.pixel_to_pane_cell(mouse_position.0, mouse_position.1, &pane.bounds)
                    })
                })
            })
            .or_else(|| self.pixel_to_cell(mouse_position.0, mouse_position.1));

        if state == ElementState::Pressed
            && url_modifier_pressed
            && let Some((col, row)) = click_cell
            && let Some(tab) = self.tab_manager.active_tab()
        {
            let adjusted_row = row + tab.active_scroll_state().offset;

            if let Some(item) = url_detection::find_url_at_position(
                &tab.active_mouse().detected_urls,
                col,
                adjusted_row,
            ) {
                match &item.item_type {
                    url_detection::DetectedItemType::Url => {
                        if let Err(e) =
                            url_detection::open_url(&item.url, &self.config.link_handler_command)
                        {
                            log::error!("Failed to open URL: {}", e);
                        }
                    }
                    url_detection::DetectedItemType::FilePath { line, column } => {
                        let editor_mode = self.config.semantic_history_editor_mode;
                        let editor_cmd = &self.config.semantic_history_editor;
                        let cwd = tab.get_cwd();
                        crate::debug_info!(
                            "SEMANTIC",
                            "Opening file path: {:?} line={:?} col={:?} mode={:?} editor_cmd={:?} cwd={:?}",
                            item.url,
                            line,
                            column,
                            editor_mode,
                            editor_cmd,
                            cwd
                        );
                        if let Err(e) = url_detection::open_file_in_editor(
                            &item.url,
                            *line,
                            *column,
                            editor_mode,
                            editor_cmd,
                            cwd.as_deref(),
                        ) {
                            crate::debug_error!("SEMANTIC", "Failed to open file: {}", e);
                        }
                    }
                }
                return; // Exit early: click handled
            }
        }

        // --- 3. Option+Click Cursor Positioning ---
        // NOTE: This must be checked BEFORE setting button_pressed to avoid triggering selection
        // Move cursor to clicked position when Option/Alt is pressed (without Cmd/Super)
        // This sends arrow key sequences to move the cursor within the shell line
        // macOS: Option+Click (matches iTerm2)
        // Windows/Linux: Alt+Click
        // Note: Option+Cmd is reserved for rectangular selection (matching iTerm2)
        if state == ElementState::Pressed
            && self.config.option_click_moves_cursor
            && self.input_handler.modifiers.state().alt_key()
            && !self.input_handler.modifiers.state().super_key() // Not Cmd/Super (that's for rectangular selection)
            && let Some((target_col, _target_row)) =
                self.pixel_to_cell(mouse_position.0, mouse_position.1)
            && let Some(tab) = self.tab_manager.active_tab()
        {
            // Only move cursor if we're at the bottom of scrollback (current view)
            // and not on the alternate screen (where apps handle their own cursor)
            let at_bottom = tab.active_scroll_state().offset == 0;
            // try_lock: intentional — double-click cursor-position query in sync loop.
            // On miss: defaults to (alt_screen=true, col=0) which skips the arrow-key
            // reposition logic. The cursor stays where it was — acceptable UX.
            let (is_alt_screen, current_col) = tab
                .terminal
                .try_write()
                .ok()
                .map(|t| (t.is_alt_screen_active(), t.cursor_position().0))
                .unwrap_or((true, 0));

            if at_bottom && !is_alt_screen {
                // Calculate horizontal movement needed
                // Send arrow keys: \x1b[C (right) or \x1b[D (left)
                let move_seq = if target_col > current_col {
                    // Move right
                    let count = target_col - current_col;
                    "\x1b[C".repeat(count)
                } else if target_col < current_col {
                    // Move left
                    let count = current_col - target_col;
                    "\x1b[D".repeat(count)
                } else {
                    // Already at target column
                    String::new()
                };

                if !move_seq.is_empty() {
                    let terminal_clone = Arc::clone(&tab.terminal);
                    let runtime = Arc::clone(&self.runtime);
                    runtime.spawn(async move {
                        let t = terminal_clone.write().await;
                        let _ = t.write(move_seq.as_bytes());
                    });
                }
                return; // Exit early: cursor move handled
            }
        }

        // --- 4. Mouse Tracking Forwarding ---
        // Forward events to the PTY if terminal application requested tracking.
        // Shift held bypasses mouse tracking to allow local text selection
        // (standard terminal convention: iTerm2, Kitty, Alacritty all honour this).
        let shift_held = self.input_handler.modifiers.state().shift_key();
        if !suppress_terminal_mouse_click
            && !shift_held
            && self.try_send_mouse_event(0, state == ElementState::Pressed)
        {
            // Still track button state so mouse motion reporting works correctly.
            // ButtonEvent mode only reports motion when button_pressed is true,
            // so we must set this even though the click was consumed by tracking.
            if let Some(tab) = self.tab_manager.active_tab_mut() {
                tab.active_mouse_mut().button_pressed = state == ElementState::Pressed;
                // Record (or clear) the press position consumed by mouse tracking.
                // handle_mouse_move uses this to suppress button=32 drag events within
                // the dead zone, preventing trackpad jitter from making tmux treat a
                // pane-focus click as a drag-selection that wipes the clipboard.
                if state == ElementState::Pressed {
                    tab.active_mouse_mut().tracking_press_position = Some(mouse_position);
                    // Clear any stale local selection state.  When mouse tracking
                    // (e.g. tmux) owns the press, handle_left_mouse_press is never
                    // called, so any previous local selection would otherwise stay
                    // visible as a stuck highlight spanning tmux virtual panes.
                    // Also reset the click anchor fields so a stale click_pixel_position
                    // from a prior non-tracking press cannot trigger an accidental drag
                    // selection if a later motion event misses the tracking lock.
                    let sm = tab.selection_mouse_mut();
                    sm.selection = None;
                    sm.is_selecting = false;
                    sm.click_position = None;
                    sm.click_pixel_position = None;
                    sm.click_count = 0;
                } else {
                    tab.active_mouse_mut().tracking_press_position = None;
                    // Ensure dragging flag is cleared when tracking consumes the release.
                    tab.selection_mouse_mut().is_selecting = false;
                }
            }
            return; // Exit early: terminal app handled the input
        }
        if suppress_terminal_mouse_click {
            crate::debug_log!(
                "MOUSE",
                "Suppressing terminal mouse click forwarding to preserve image clipboard"
            );
            if let Some(tab) = self.tab_manager.active_tab_mut() {
                // Fully consume the protected click so it doesn't become a local
                // selection anchor and affect the next drag-selection gesture.
                tab.active_mouse_mut().button_pressed = false;
                tab.selection_mouse_mut().is_selecting = false;
            }
            return;
        }

        // Track button press state for motion tracking logic (drag selection, motion reporting)
        // This is set AFTER special handlers (URL click, Option+click, mouse tracking) to avoid
        // triggering selection when those features handle the click.
        // Also clear tracking_press_position on release: the press was not forwarded to mouse
        // tracking (either tracking was disabled, or focus switched between panes), so any
        // stale position from a prior tracking interaction is cleaned up.
        if let Some(tab) = self.tab_manager.active_tab_mut() {
            tab.active_mouse_mut().button_pressed = state == ElementState::Pressed;
            if state == ElementState::Released {
                tab.active_mouse_mut().tracking_press_position = None;
            }
        }

        if state == ElementState::Pressed {
            self.handle_left_mouse_press(mouse_position);
        } else {
            self.handle_left_mouse_release();
        }
    }

    /// Returns true if the given physical-pixel position falls within the tab bar area.
    ///
    /// Tab bar dimensions come from `TabBarUI` (logical pixels) and are scaled to physical
    /// pixels using the window's scale factor, matching the coordinate space of winit mouse events.
    pub(crate) fn is_mouse_in_tab_bar(&self, mouse_position: (f64, f64)) -> bool {
        let tab_count = self.tab_manager.tab_count();
        let tab_bar_height = self.tab_bar_ui.get_height(tab_count, &self.config);
        let tab_bar_width = self.tab_bar_ui.get_width(tab_count, &self.config);
        let scale_factor = self
            .window
            .as_ref()
            .map(|w| w.scale_factor())
            .unwrap_or(1.0);
        match self.config.tab_bar_position {
            crate::config::TabBarPosition::Top => {
                mouse_position.1 < tab_bar_height as f64 * scale_factor
            }
            crate::config::TabBarPosition::Bottom => {
                let window_height = self
                    .window
                    .as_ref()
                    .map(|w| w.inner_size().height as f64)
                    .unwrap_or(0.0);
                mouse_position.1 > window_height - tab_bar_height as f64 * scale_factor
            }
            crate::config::TabBarPosition::Left => {
                mouse_position.0 < tab_bar_width as f64 * scale_factor
            }
        }
    }
}