datui_lib/widgets/

multiline_text_input.rs

use color_eyre::Result;
use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
use ratatui::{
    layout::Rect,
    style::{Color, Modifier, Style},
    widgets::Widget,
};
use tui_textarea::{Input, Key, TextArea};

use crate::cache::CacheManager;
use crate::config::Theme;

use super::text_input_common::{add_to_history, load_history_impl, save_history_impl};

/// Event emitted by MultiLineTextInput widget
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TextInputEvent {
    None,
    Submit,         // Not used for multi-line (Enter inserts newline)
    Cancel,         // Esc pressed
    HistoryChanged, // History navigation occurred
}

/// Multi-line text input widget wrapping tui-textarea with history support
pub struct MultiLineTextInput {
    textarea: TextArea<'static>,
    // Public fields for backward compatibility (kept in sync with textarea)
    pub value: String,
    pub cursor: usize,
    pub history_id: Option<String>,
    pub history: Vec<String>,
    pub history_index: Option<usize>,
    pub history_temp: Option<String>,
    pub history_limit: usize,
    pub history_loaded: bool,
    // Multi-line specific fields (derived from textarea)
    pub scroll_offset: usize, // Vertical scroll offset (which line to show at top)
    pub horizontal_scroll_offset: usize, // Horizontal scroll offset (which column to show at left)
    pub cursor_line: usize,   // Current line number (0-based)
    pub cursor_col: usize,    // Current column within line (character position)
    // Styling (same as TextInput)
    text_color: Option<Color>,
    cursor_bg: Option<Color>,
    cursor_fg: Option<Color>,
    background_color: Option<Color>,
    cursor_focused: Option<Color>, // Cursor color when focused (from theme)
    focused: bool,                 // Whether the widget is currently focused
}

impl MultiLineTextInput {
    /// Create a new MultiLineTextInput widget
    pub fn new() -> Self {
        let mut textarea = TextArea::default();
        // Disable cursor line underline
        // Don't set line_number_style - leaving it unset means no line numbers (default behavior)
        use ratatui::style::Style;
        textarea.set_cursor_line_style(Style::default()); // No underline

        let mut widget = Self {
            textarea,
            value: String::new(),
            cursor: 0,
            history_id: None,
            history: Vec::new(),
            history_index: None,
            history_temp: None,
            history_limit: 1000,
            history_loaded: false,
            scroll_offset: 0,
            horizontal_scroll_offset: 0,
            cursor_line: 0,
            cursor_col: 0,
            text_color: None,
            cursor_bg: None,
            cursor_fg: None,
            background_color: None,
            cursor_focused: None,
            focused: false,
        };
        // Apply any colors that were set (none initially, but this ensures consistency)
        widget.apply_colors_to_textarea();
        widget
    }

    /// Set all colors at once
    /// Note: cursor_bg and cursor_fg are deprecated - cursor colors are now automatically reversed
    #[allow(deprecated)]
    pub fn with_style(mut self, text_color: Color, cursor_bg: Color, cursor_fg: Color) -> Self {
        self.text_color = Some(text_color);
        self.cursor_bg = Some(cursor_bg);
        self.cursor_fg = Some(cursor_fg);
        self.apply_colors_to_textarea();
        self
    }

    /// Set text color only
    pub fn with_text_color(mut self, color: Color) -> Self {
        self.text_color = Some(color);
        self.apply_colors_to_textarea();
        self
    }

    /// Set cursor colors only (deprecated: cursor colors are now automatically reversed)
    #[deprecated(note = "Cursor colors are now automatically reversed from text/background colors")]
    pub fn with_cursor_colors(mut self, bg: Color, fg: Color) -> Self {
        self.cursor_bg = Some(bg);
        self.cursor_fg = Some(fg);
        self
    }

    /// Set optional background color for input area
    pub fn with_background(mut self, color: Color) -> Self {
        self.background_color = Some(color);
        self.apply_colors_to_textarea();
        self
    }

    /// Convenience method to set colors from theme
    /// Cursor colors are automatically reversed from text/background colors
    pub fn with_theme(mut self, theme: &Theme) -> Self {
        let text_primary = theme.get("text_primary");
        // Set text color from theme
        self.text_color = Some(text_primary);
        // Set cursor color from theme
        self.cursor_focused = Some(theme.get("cursor_focused"));
        self.apply_colors_to_textarea();
        self
    }

    /// Enable history with the given ID
    pub fn with_history(mut self, history_id: String) -> Self {
        self.history_id = Some(history_id);
        self
    }

    /// Set history limit
    pub fn with_history_limit(mut self, limit: usize) -> Self {
        self.history_limit = limit;
        self
    }

    /// Set focused state
    pub fn set_focused(&mut self, focused: bool) {
        self.focused = focused;
        // Use tui-textarea's set_cursor_style to hide/show cursor
        // Setting the same style as text hides the cursor (per tui-textarea docs)
        if focused {
            // When focused, always use a visible cursor style
            // Default to REVERSED modifier (tui-textarea's default) for maximum compatibility
            let cursor_color = self.cursor_focused.unwrap_or(Color::Reset);
            let cursor_style = if cursor_color == Color::Reset {
                // Use reversed modifier (tui-textarea default behavior)
                Style::default().add_modifier(Modifier::REVERSED)
            } else {
                // Use theme-based cursor color with explicit background
                let text_color = match cursor_color {
                    Color::White => Color::Black,
                    Color::Black => Color::White,
                    Color::Red => Color::White,
                    Color::Green => Color::Black,
                    Color::Yellow => Color::Black,
                    Color::Blue => Color::White,
                    Color::Magenta => Color::White,
                    Color::Cyan => Color::Black,
                    Color::Gray => Color::Black,
                    Color::DarkGray => Color::White,
                    Color::LightRed => Color::Black,
                    Color::LightGreen => Color::Black,
                    Color::LightYellow => Color::Black,
                    Color::LightBlue => Color::Black,
                    Color::LightMagenta => Color::Black,
                    Color::LightCyan => Color::Black,
                    _ => Color::Black,
                };
                Style::default().bg(cursor_color).fg(text_color)
            };
            self.textarea.set_cursor_style(cursor_style);
        } else {
            // When unfocused, set cursor style to exactly match textarea's text style (hides cursor)
            // Get the actual textarea style to match it exactly
            let textarea_style = self.textarea.style();
            self.textarea.set_cursor_style(textarea_style);
        }
    }

    /// Get the current value (multi-line)
    pub fn value(&self) -> &str {
        &self.value
    }

    /// Sync value, cursor, and line/col from textarea
    fn sync_from_textarea(&mut self) {
        // Get all lines and join with newlines
        let lines = self.textarea.lines();
        self.value = lines.join("\n");

        // Get cursor position
        let (line, col) = self.textarea.cursor();
        self.cursor_line = line;
        self.cursor_col = col;

        // Calculate character-based cursor position
        let mut char_pos = 0;
        for (i, line_text) in lines.iter().enumerate() {
            if i < self.cursor_line {
                char_pos += line_text.chars().count() + 1; // +1 for newline
            } else if i == self.cursor_line {
                char_pos += self.cursor_col;
                break;
            }
        }
        self.cursor = char_pos;
    }

    /// Apply text and background colors to the textarea
    fn apply_colors_to_textarea(&mut self) {
        // Build style from text_color and background_color
        let mut style = Style::default();
        if let Some(text_color) = self.text_color {
            style = style.fg(text_color);
        }
        if let Some(bg_color) = self.background_color {
            style = style.bg(bg_color);
        }
        // Apply style to textarea
        self.textarea.set_style(style);
        // Disable cursor line underline
        self.textarea.set_cursor_line_style(Style::default());
    }

    /// Sync textarea from value
    fn sync_to_textarea(&mut self) {
        let lines: Vec<String> = self.value.lines().map(|s| s.to_string()).collect();
        self.textarea = if lines.is_empty() {
            TextArea::default()
        } else {
            TextArea::new(lines)
        };
        // Re-apply colors and cursor line style configuration
        // This is necessary because creating a new TextArea resets the style
        self.apply_colors_to_textarea();
        // Re-apply cursor style based on focus state (since textarea was recreated)
        let was_focused = self.focused;
        self.focused = false; // Temporarily set to false so set_focused will update
        self.set_focused(was_focused);
        // Set cursor position
        use tui_textarea::CursorMove;
        self.textarea.move_cursor(CursorMove::Jump(
            self.cursor_line.min(u16::MAX as usize) as u16,
            self.cursor_col.min(u16::MAX as usize) as u16,
        ));
    }

    /// Get line count
    pub fn line_count(&self) -> usize {
        self.textarea.lines().len()
    }

    /// Get line at index
    pub fn line_at(&self, line_idx: usize) -> Option<&str> {
        self.textarea.lines().get(line_idx).map(|s| s.as_str())
    }

    /// Update cursor_line and cursor_col from cursor position
    pub fn update_line_col_from_cursor(&mut self) {
        self.sync_from_textarea();
    }

    /// Convert line/column to cursor position
    pub fn line_col_to_cursor(&self, line: usize, col: usize) -> usize {
        let lines = self.textarea.lines();
        let mut char_pos = 0;
        for (i, line_text) in lines.iter().enumerate() {
            if i < line {
                char_pos += line_text.chars().count() + 1; // +1 for newline
            } else if i == line {
                char_pos += col.min(line_text.chars().count());
                break;
            }
        }
        char_pos
    }

    /// Ensure cursor is visible (adjust scroll offsets)
    pub fn ensure_cursor_visible(&mut self, _area_height: u16, _area_width: u16) {
        self.sync_from_textarea();
        // tui-textarea handles scrolling automatically, but we track it for compatibility
        // The textarea widget handles viewport management internally
    }

    /// Load history from cache (lazy loading)
    pub fn load_history(&mut self, cache: &CacheManager) -> Result<()> {
        if self.history_loaded {
            return Ok(());
        }
        if let Some(ref history_id) = self.history_id {
            self.history = load_history_impl(cache, history_id)?;
            self.history_loaded = true;
        }
        Ok(())
    }

    /// Save current value to history
    pub fn save_to_history(&mut self, cache: &CacheManager) -> Result<()> {
        if let Some(history_id) = self.history_id.clone() {
            self.sync_from_textarea(); // Ensure value is up to date
            if !self.value.is_empty() {
                // Add to history with deduplication
                add_to_history(&mut self.history, self.value.clone());
                // Save to cache
                save_history_impl(cache, &history_id, &self.history, self.history_limit)?;
            }
        }
        Ok(())
    }

    /// Clear the input
    pub fn clear(&mut self) {
        self.textarea = TextArea::default();
        self.value.clear();
        self.cursor = 0;
        self.cursor_line = 0;
        self.cursor_col = 0;
        self.history_index = None;
        self.history_temp = None;
    }

    /// Check if input is empty
    pub fn is_empty(&self) -> bool {
        self.value.is_empty()
    }

    /// Navigate history up (older entries) - Ctrl-P
    pub fn navigate_history_up(&mut self, cache: Option<&CacheManager>) {
        if self.history_id.is_none() {
            return;
        }

        // Lazy load history if needed
        if !self.history_loaded {
            if let Some(cache) = cache {
                if let Err(e) = self.load_history(cache) {
                    eprintln!("Warning: Could not load history: {}", e);
                    return;
                }
            } else {
                return;
            }
        }

        if self.history.is_empty() {
            return;
        }

        // Save current value to temp if we're starting history navigation
        if self.history_index.is_none() {
            self.sync_from_textarea(); // Ensure value is up to date
            self.history_temp = Some(self.value.clone());
        }

        // Move to previous (older) entry
        let new_index = if let Some(current_idx) = self.history_index {
            if current_idx > 0 {
                current_idx - 1
            } else {
                current_idx // Already at oldest
            }
        } else {
            self.history.len() - 1 // Start from most recent
        };

        self.history_index = Some(new_index);
        if let Some(entry) = self.history.get(new_index) {
            self.value = entry.clone();
            // Set cursor to end
            let lines: Vec<&str> = self.value.lines().collect();
            if let Some(last_line) = lines.last() {
                self.cursor_line = lines.len().saturating_sub(1);
                self.cursor_col = last_line.chars().count();
            }
            self.sync_to_textarea();
        }
    }

    /// Navigate history down (newer entries) - Ctrl-N
    pub fn navigate_history_down(&mut self) {
        if self.history_id.is_none() || self.history_index.is_none() {
            return;
        }

        let current_idx = self.history_index.unwrap();
        if current_idx >= self.history.len() - 1 {
            // Restore temp value
            if let Some(ref temp) = self.history_temp {
                self.value = temp.clone();
                // Set cursor to end
                let lines: Vec<&str> = self.value.lines().collect();
                if let Some(last_line) = lines.last() {
                    self.cursor_line = lines.len().saturating_sub(1);
                    self.cursor_col = last_line.chars().count();
                }
                self.sync_to_textarea();
            }
            self.history_index = None;
            self.history_temp = None;
        } else {
            // Move to next (newer) entry
            let new_index = current_idx + 1;
            self.history_index = Some(new_index);
            if let Some(entry) = self.history.get(new_index) {
                self.value = entry.clone();
                // Set cursor to end
                let lines: Vec<&str> = self.value.lines().collect();
                if let Some(last_line) = lines.last() {
                    self.cursor_line = lines.len().saturating_sub(1);
                    self.cursor_col = last_line.chars().count();
                }
                self.sync_to_textarea();
            }
        }
    }

    /// Handle a key event
    pub fn handle_key(&mut self, event: &KeyEvent, cache: Option<&CacheManager>) -> TextInputEvent {
        // Convert KeyEvent to tui_textarea::Input
        let input = self.key_event_to_input(event);

        match event.code {
            KeyCode::Esc => {
                return TextInputEvent::Cancel;
            }
            KeyCode::Char('p') | KeyCode::Char('P')
                if event.modifiers.contains(KeyModifiers::CONTROL) =>
            {
                // Ctrl-P: Navigate history up
                if self.history_id.is_some() {
                    self.navigate_history_up(cache);
                    return TextInputEvent::HistoryChanged;
                }
            }
            KeyCode::Char('n') | KeyCode::Char('N')
                if event.modifiers.contains(KeyModifiers::CONTROL) =>
            {
                // Ctrl-N: Navigate history down
                if self.history_id.is_some() {
                    self.navigate_history_down();
                    return TextInputEvent::HistoryChanged;
                }
            }
            _ => {
                // Handle the input (Enter inserts newline, which is correct for multi-line)
                self.textarea.input(input);
                // Sync value and cursor from textarea
                self.sync_from_textarea();
                // Clear history navigation state when user types
                if self.history_index.is_some() {
                    self.history_index = None;
                    self.history_temp = None;
                }
            }
        }
        TextInputEvent::None
    }

    /// Convert crossterm KeyEvent to tui_textarea::Input
    fn key_event_to_input(&self, event: &KeyEvent) -> Input {
        let ctrl = event.modifiers.contains(KeyModifiers::CONTROL);
        let alt = event.modifiers.contains(KeyModifiers::ALT);
        let shift = event.modifiers.contains(KeyModifiers::SHIFT);

        let key = match event.code {
            KeyCode::Char(c) => Key::Char(c),
            KeyCode::Backspace => Key::Backspace,
            KeyCode::Enter => Key::Enter,
            KeyCode::Left => Key::Left,
            KeyCode::Right => Key::Right,
            KeyCode::Up => Key::Up,
            KeyCode::Down => Key::Down,
            KeyCode::Home => Key::Home,
            KeyCode::End => Key::End,
            KeyCode::PageUp => Key::PageUp,
            KeyCode::PageDown => Key::PageDown,
            KeyCode::Tab => Key::Tab,
            KeyCode::BackTab => Key::Tab,
            KeyCode::Delete => Key::Delete,
            KeyCode::Insert => Key::Null,
            KeyCode::F(_) => Key::Null,
            KeyCode::Null => Key::Null,
            KeyCode::Esc => Key::Esc,
            KeyCode::CapsLock
            | KeyCode::ScrollLock
            | KeyCode::NumLock
            | KeyCode::PrintScreen
            | KeyCode::Pause
            | KeyCode::Menu
            | KeyCode::Media(_)
            | KeyCode::Modifier(_)
            | KeyCode::KeypadBegin => Key::Null,
        };

        Input {
            key,
            ctrl,
            alt,
            shift,
        }
    }
}

impl Default for MultiLineTextInput {
    fn default() -> Self {
        Self::new()
    }
}

impl Widget for &MultiLineTextInput {
    fn render(self, area: Rect, buf: &mut ratatui::buffer::Buffer) {
        // Render the textarea - it handles all text rendering and styling
        self.textarea.render(area, buf);

        // Remove underline modifier from all cells (tui-textarea handles cursor visibility via set_cursor_style)
        for y in area.y..area.bottom() {
            for x in area.x..area.right() {
                let cell = &mut buf[(x, y)];
                let mut style = cell.style();
                style = style.remove_modifier(Modifier::UNDERLINED);
                cell.set_style(style);
            }
        }
    }
}

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

    #[test]
    fn test_multiline_text_input_new() {
        let input = MultiLineTextInput::new();
        assert_eq!(input.value(), "");
        assert_eq!(input.cursor_line, 0);
        assert_eq!(input.cursor_col, 0);
        assert_eq!(input.history_id, None);
        assert_eq!(input.history_limit, 1000);
        assert!(!input.focused);
    }

    #[test]
    fn test_set_value() {
        let mut input = MultiLineTextInput::new();
        input.value = "line1\nline2".to_string();
        input.sync_to_textarea();
        assert_eq!(input.line_count(), 2);
    }

    #[test]
    fn test_clear() {
        let mut input = MultiLineTextInput::new();
        input.value = "hello".to_string();
        input.clear();
        assert_eq!(input.value, "");
        assert_eq!(input.cursor, 0);
    }

    #[test]
    fn test_is_empty() {
        let mut input = MultiLineTextInput::new();
        assert!(input.is_empty());
        input.value = "hello".to_string();
        assert!(!input.is_empty());
    }
}