// Simplified fixture mimicking Zed's editor.rs structure
// Real editor.rs has 675 methods, 152 fields
// This fixture has a smaller but representative subset

pub struct Editor {
    // Display-related fields
    display_map: DisplayMap,
    style: EditorStyle,
    scroll_manager: ScrollManager,
    cursor: Cursor,
    gutter: Gutter,

    // Event handling fields
    focus_handle: FocusHandle,
    event_handlers: EventHandlers,
    input_buffer: InputBuffer,

    // Buffer and state fields
    buffer: Buffer,
    selections: Vec<Selection>,
    undo_stack: UndoStack,

    // Configuration fields
    settings: EditorSettings,
    theme: Theme,
    language: Language,
}

impl Editor {
    // Lifecycle methods
    pub fn new(buffer: Buffer, settings: EditorSettings) -> Self {
        Self {
            display_map: DisplayMap::new(),
            style: EditorStyle::default(),
            scroll_manager: ScrollManager::new(),
            cursor: Cursor::default(),
            gutter: Gutter::new(),
            focus_handle: FocusHandle::new(),
            event_handlers: EventHandlers::default(),
            input_buffer: InputBuffer::new(),
            buffer,
            selections: Vec::new(),
            undo_stack: UndoStack::new(),
            settings,
            theme: Theme::default(),
            language: Language::default(),
        }
    }

    pub fn init(&mut self) {
        self.display_map.initialize();
        self.scroll_manager.reset();
        self.setup_event_handlers();
    }

    pub fn shutdown(&mut self) {
        self.cleanup_handlers();
        self.buffer.flush();
    }

    // Rendering methods (cohesive group 1)
    pub fn render(&self) -> RenderOutput {
        let mut output = RenderOutput::new();
        self.render_gutter(&mut output);
        self.paint_highlighted_ranges(&mut output);
        self.draw_cursor(&mut output);
        self.paint_background(&mut output);
        output
    }

    pub fn render_gutter(&self, output: &mut RenderOutput) {
        output.add_gutter(self.gutter.render());
    }

    pub fn paint_highlighted_ranges(&self, output: &mut RenderOutput) {
        for selection in &self.selections {
            output.add_highlight(selection.range());
        }
    }

    pub fn draw_cursor(&self, output: &mut RenderOutput) {
        output.add_cursor(self.cursor.position());
    }

    pub fn paint_background(&self, output: &mut RenderOutput) {
        output.set_background(self.theme.background_color());
    }

    pub fn update_view(&mut self) {
        self.display_map.update();
        self.scroll_manager.adjust();
    }

    pub fn show_completions(&mut self) {
        // Show completion popup
    }

    pub fn display_diagnostics(&self) -> Vec<Diagnostic> {
        self.buffer.diagnostics()
    }

    pub fn format_line(&self, line: usize) -> String {
        self.buffer.line(line).to_string()
    }

    // Event handling methods (cohesive group 2)
    pub fn handle_keypress(&mut self, key: Key) {
        match key {
            Key::Enter => self.insert_newline(),
            Key::Backspace => self.delete_backward(),
            Key::Delete => self.delete_forward(),
            _ => self.insert_char(key.char()),
        }
    }

    pub fn on_mouse_down(&mut self, event: MouseEvent) {
        let position = self.display_map.point_from_screen(event.position);
        self.move_cursor_to(position);
    }

    pub fn on_scroll(&mut self, delta: f64) {
        self.scroll_manager.scroll_by(delta);
    }

    pub fn handle_input_event(&mut self, event: InputEvent) {
        self.input_buffer.push(event);
        self.process_input_buffer();
    }

    pub fn dispatch_action(&mut self, action: Action) {
        self.event_handlers.dispatch(action);
    }

    pub fn trigger_completion(&mut self) {
        self.show_completions();
    }

    pub fn process_event(&mut self, event: Event) {
        match event {
            Event::Key(key) => self.handle_keypress(key),
            Event::Mouse(mouse) => self.on_mouse_down(mouse),
            Event::Scroll(delta) => self.on_scroll(delta),
            _ => {}
        }
    }

    pub fn handle_paste(&mut self, text: String) {
        self.insert_text(text);
    }

    pub fn on_focus(&mut self) {
        self.focus_handle.acquire();
    }

    pub fn on_blur(&mut self) {
        self.focus_handle.release();
    }

    // Buffer manipulation methods (cohesive group 3)
    pub fn insert_text(&mut self, text: String) {
        self.buffer.insert(&self.cursor.position(), &text);
        self.undo_stack.push(Action::Insert(text));
    }

    pub fn insert_newline(&mut self) {
        self.insert_text("\n".to_string());
    }

    pub fn insert_char(&mut self, c: char) {
        self.insert_text(c.to_string());
    }

    pub fn delete_backward(&mut self) {
        if let Some(deleted) = self.buffer.delete_backward(&self.cursor.position()) {
            self.undo_stack.push(Action::Delete(deleted));
        }
    }

    pub fn delete_forward(&mut self) {
        if let Some(deleted) = self.buffer.delete_forward(&self.cursor.position()) {
            self.undo_stack.push(Action::Delete(deleted));
        }
    }

    pub fn undo(&mut self) {
        if let Some(action) = self.undo_stack.pop() {
            action.undo(&mut self.buffer);
        }
    }

    pub fn redo(&mut self) {
        if let Some(action) = self.undo_stack.redo() {
            action.apply(&mut self.buffer);
        }
    }

    // State management methods (cohesive group 4)
    pub fn get_selection(&self) -> &[Selection] {
        &self.selections
    }

    pub fn set_selection(&mut self, selections: Vec<Selection>) {
        self.selections = selections;
    }

    pub fn update_cursor(&mut self, position: Position) {
        self.cursor.set_position(position);
    }

    pub fn mutate_buffer(&mut self, f: impl FnOnce(&mut Buffer)) {
        f(&mut self.buffer);
    }

    pub fn state_snapshot(&self) -> EditorState {
        EditorState {
            cursor: self.cursor.clone(),
            selections: self.selections.clone(),
            scroll: self.scroll_manager.offset(),
        }
    }

    pub fn restore_state(&mut self, state: EditorState) {
        self.cursor = state.cursor;
        self.selections = state.selections;
        self.scroll_manager.set_offset(state.scroll);
    }

    // Validation methods (cohesive group 5)
    pub fn validate_position(&self, pos: Position) -> bool {
        self.buffer.is_valid_position(pos)
    }

    pub fn check_syntax(&self) -> Vec<SyntaxError> {
        self.buffer.parse_errors()
    }

    pub fn verify_selections(&self) -> bool {
        self.selections.iter().all(|s| s.is_valid())
    }

    pub fn ensure_valid_state(&self) -> Result<(), String> {
        if !self.verify_selections() {
            return Err("Invalid selections".to_string());
        }
        Ok(())
    }

    pub fn is_valid_edit(&self, edit: &Edit) -> bool {
        self.validate_position(edit.position())
    }

    // Persistence methods (cohesive group 6)
    pub fn save(&mut self, path: &str) -> Result<(), String> {
        self.buffer.write_to_file(path)
    }

    pub fn load(path: &str) -> Result<Self, String> {
        let buffer = Buffer::read_from_file(path)?;
        let settings = EditorSettings::default();
        Ok(Self::new(buffer, settings))
    }

    pub fn serialize(&self) -> String {
        serde_json::to_string(&self.state_snapshot()).unwrap()
    }

    pub fn deserialize(data: &str) -> Result<EditorState, String> {
        serde_json::from_str(data).map_err(|e| e.to_string())
    }

    // Helper methods
    fn setup_event_handlers(&mut self) {
        self.event_handlers.register("keypress", |e| {});
    }

    fn cleanup_handlers(&mut self) {
        self.event_handlers.clear();
    }

    fn move_cursor_to(&mut self, position: Position) {
        self.cursor.set_position(position);
    }

    fn process_input_buffer(&mut self) {
        while let Some(event) = self.input_buffer.pop() {
            self.handle_input_event(event);
        }
    }
}

// Supporting types
pub struct DisplayMap;
impl DisplayMap {
    fn new() -> Self { Self }
    fn initialize(&mut self) {}
    fn update(&mut self) {}
    fn point_from_screen(&self, _pos: (f64, f64)) -> Position { Position::default() }
}

pub struct EditorStyle;
impl Default for EditorStyle {
    fn default() -> Self { Self }
}

pub struct ScrollManager;
impl ScrollManager {
    fn new() -> Self { Self }
    fn reset(&mut self) {}
    fn adjust(&mut self) {}
    fn scroll_by(&mut self, _delta: f64) {}
    fn offset(&self) -> f64 { 0.0 }
    fn set_offset(&mut self, _offset: f64) {}
}

#[derive(Clone, Default)]
pub struct Cursor;
impl Cursor {
    fn position(&self) -> Position { Position::default() }
    fn set_position(&mut self, _pos: Position) {}
}

pub struct Gutter;
impl Gutter {
    fn new() -> Self { Self }
    fn render(&self) -> String { String::new() }
}

pub struct FocusHandle;
impl FocusHandle {
    fn new() -> Self { Self }
    fn acquire(&mut self) {}
    fn release(&mut self) {}
}

pub struct EventHandlers;
impl Default for EventHandlers {
    fn default() -> Self { Self }
}
impl EventHandlers {
    fn dispatch(&self, _action: Action) {}
    fn register(&mut self, _name: &str, _handler: impl Fn(Event)) {}
    fn clear(&mut self) {}
}

pub struct InputBuffer;
impl InputBuffer {
    fn new() -> Self { Self }
    fn push(&mut self, _event: InputEvent) {}
    fn pop(&mut self) -> Option<InputEvent> { None }
}

pub struct Buffer;
impl Buffer {
    fn flush(&mut self) {}
    fn insert(&mut self, _pos: &Position, _text: &str) {}
    fn delete_backward(&mut self, _pos: &Position) -> Option<String> { None }
    fn delete_forward(&mut self, _pos: &Position) -> Option<String> { None }
    fn is_valid_position(&self, _pos: Position) -> bool { true }
    fn parse_errors(&self) -> Vec<SyntaxError> { Vec::new() }
    fn diagnostics(&self) -> Vec<Diagnostic> { Vec::new() }
    fn line(&self, _n: usize) -> &str { "" }
    fn write_to_file(&self, _path: &str) -> Result<(), String> { Ok(()) }
    fn read_from_file(_path: &str) -> Result<Self, String> { Ok(Self) }
}

#[derive(Clone)]
pub struct Selection;
impl Selection {
    fn range(&self) -> (Position, Position) { (Position::default(), Position::default()) }
    fn is_valid(&self) -> bool { true }
}

pub struct UndoStack;
impl UndoStack {
    fn new() -> Self { Self }
    fn push(&mut self, _action: Action) {}
    fn pop(&mut self) -> Option<Action> { None }
    fn redo(&mut self) -> Option<Action> { None }
}

pub struct EditorSettings;
impl Default for EditorSettings {
    fn default() -> Self { Self }
}

pub struct Theme;
impl Default for Theme {
    fn default() -> Self { Self }
}
impl Theme {
    fn background_color(&self) -> String { "#ffffff".to_string() }
}

pub struct Language;
impl Default for Language {
    fn default() -> Self { Self }
}

#[derive(Clone, Default)]
pub struct Position;

pub struct RenderOutput;
impl RenderOutput {
    fn new() -> Self { Self }
    fn add_gutter(&mut self, _s: String) {}
    fn add_highlight(&mut self, _range: (Position, Position)) {}
    fn add_cursor(&mut self, _pos: Position) {}
    fn set_background(&mut self, _color: String) {}
}

pub struct Diagnostic;
pub struct SyntaxError;

pub enum Key {
    Enter,
    Backspace,
    Delete,
    Char(char),
}

impl Key {
    fn char(&self) -> char {
        match self {
            Key::Char(c) => *c,
            _ => '\0',
        }
    }
}

pub struct MouseEvent {
    position: (f64, f64),
}

pub struct InputEvent;

pub enum Event {
    Key(Key),
    Mouse(MouseEvent),
    Scroll(f64),
}

pub enum Action {
    Insert(String),
    Delete(String),
}

impl Action {
    fn undo(&self, _buffer: &mut Buffer) {}
    fn apply(&self, _buffer: &mut Buffer) {}
}

pub struct Edit;
impl Edit {
    fn position(&self) -> Position { Position::default() }
}

#[derive(Clone)]
pub struct EditorState {
    cursor: Cursor,
    selections: Vec<Selection>,
    scroll: f64,
}
