wat/src/app.rs

use crate::config::Config;
use crate::state::{AppState, TimeItem};
use chrono::Utc;
use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
use std::process::Command;

pub enum Screen {
    Main,
    Help,
    ConfigHelp,
    NewEntry,
}

pub struct App {
    pub state: AppState,
    pub config: Config,
    pub current_screen: Screen,
    pub needs_redraw: bool,
    pub new_entry_buffer: String,
    pub new_entry_project: String,
    pub new_entry_cursor: usize,
    pub new_entry_mode: NewEntryMode, // Task or Project
    pub status_message: Option<(String, std::time::Instant)>,
}

pub enum NewEntryMode {
    Task,
    Project,
}

impl App {
    pub fn new() -> anyhow::Result<Self> {
        Ok(Self {
            state: AppState::load()?,
            config: Config::load()?,
            current_screen: Screen::Main,
            needs_redraw: true,
            new_entry_buffer: String::new(),
            new_entry_project: String::new(),
            new_entry_cursor: 0,
            new_entry_mode: NewEntryMode::Task,
            status_message: None,
        })
    }

    pub fn handle_event(&mut self, event: Event) -> anyhow::Result<bool> {
        // Update status message
        self.update_status_message();

        match self.current_screen {
            Screen::Main => self.handle_main_event(event),
            Screen::Help => self.handle_help_event(event),
            Screen::ConfigHelp => self.handle_config_help_event(event),
            Screen::NewEntry => self.handle_new_entry_event(event),
        }
    }

    fn handle_main_event(&mut self, event: Event) -> anyhow::Result<bool> {
        match event {
            Event::Key(KeyEvent {
                code, modifiers, ..
            }) => match (code, modifiers) {
                (KeyCode::Char('q'), _) => return Ok(true),
                (KeyCode::Char('j'), _) | (KeyCode::Down, _) => self.move_selection(1),
                (KeyCode::Char('k'), _) | (KeyCode::Up, _) => self.move_selection(-1),
                (KeyCode::Char('h'), _) | (KeyCode::Left, _) => self.change_pane(-1),
                (KeyCode::Char('l'), _) | (KeyCode::Right, _) => self.change_pane(1),
                (KeyCode::Char('n'), KeyModifiers::CONTROL) => self.change_pane(1),
                (KeyCode::Char('p'), KeyModifiers::CONTROL) => self.change_pane(-1),
                (KeyCode::Enter, _) => self.toggle_current_item()?,
                (KeyCode::Char('e'), KeyModifiers::CONTROL) => self.edit_config()?,
                (KeyCode::Char('?'), _) => self.current_screen = Screen::Help,
                (KeyCode::Char('c'), _) => self.edit_app_config()?,
                (KeyCode::Char('n'), _) => self.start_new_entry(),
                (KeyCode::Char('d'), _) => self.delete_current_item()?,
                _ => {}
            },
            _ => {}
        }
        Ok(false)
    }

    fn handle_new_entry_event(&mut self, event: Event) -> anyhow::Result<bool> {
        match event {
            Event::Key(KeyEvent {
                code, modifiers, ..
            }) => {
                match (code, modifiers) {
                    (KeyCode::Esc, _) => {
                        self.current_screen = Screen::Main;
                        self.new_entry_buffer.clear();
                        self.new_entry_project.clear();
                        self.new_entry_mode = NewEntryMode::Task;
                        self.new_entry_cursor = 0;
                    }
                    (KeyCode::Enter, _) => {
                        match self.new_entry_mode {
                            NewEntryMode::Task => {
                                if !self.new_entry_buffer.is_empty() {
                                    self.new_entry_mode = NewEntryMode::Project;
                                    self.new_entry_cursor = self.new_entry_project.len();
                                }
                            }
                            NewEntryMode::Project => {
                                if self.new_entry_project.is_empty()
                                    || self.config.is_valid_project(&self.new_entry_project)
                                {
                                    // Create new time item
                                    let item = TimeItem {
                                        name: self.new_entry_buffer.clone(),
                                        tags: if self.new_entry_project.is_empty() {
                                            vec![]
                                        } else {
                                            vec![self.new_entry_project.clone()]
                                        },
                                        last_used: Some(Utc::now()),
                                    };
                                    // Add to current pane (or recurring if in recent)
                                    match self.state.current_pane {
                                        0 => self.state.permanent_items.push(item), // Permanent Items
                                        1 => self.state.recurring_items.push(item), // Recurring Items
                                        2 => self.state.recent_items.push(item),    // Ad-Hoc Items
                                        _ => unreachable!(),
                                    }
                                    self.state.save()?;

                                    // Clear and return to main screen
                                    self.current_screen = Screen::Main;
                                    self.new_entry_buffer.clear();
                                    self.new_entry_project.clear();
                                    self.new_entry_mode = NewEntryMode::Task;
                                }
                            }
                        }
                    }
                    (KeyCode::Backspace, _) => match self.new_entry_mode {
                        NewEntryMode::Task => {
                            if self.new_entry_cursor > 0 {
                                self.new_entry_buffer.remove(self.new_entry_cursor - 1);
                                self.new_entry_cursor -= 1;
                            }
                        }
                        NewEntryMode::Project => {
                            if self.new_entry_cursor > 0 {
                                let idx = self.new_entry_cursor - 1;
                                if idx < self.new_entry_project.len() {
                                    self.new_entry_project.remove(idx);
                                    self.new_entry_cursor -= 1;
                                }
                            }
                        }
                    },
                    (KeyCode::Char(c), m) if m.is_empty() => match self.new_entry_mode {
                        NewEntryMode::Task => {
                            self.new_entry_buffer.insert(self.new_entry_cursor, c);
                            self.new_entry_cursor += 1;
                        }
                        NewEntryMode::Project => {
                            if self.new_entry_cursor <= self.new_entry_project.len() {
                                self.new_entry_project.insert(self.new_entry_cursor, c);
                                self.new_entry_cursor += 1;
                            }
                        }
                    },
                    _ => {}
                }
            }
            _ => {}
        }
        Ok(false)
    }

    fn handle_help_event(&mut self, event: Event) -> anyhow::Result<bool> {
        match event {
            Event::Key(KeyEvent { code, .. }) => match code {
                KeyCode::Char('c') => self.current_screen = Screen::ConfigHelp,
                KeyCode::Esc | KeyCode::Char('q') => self.current_screen = Screen::Main,
                _ => {}
            },
            _ => {}
        }
        Ok(false)
    }

    fn handle_config_help_event(&mut self, event: Event) -> anyhow::Result<bool> {
        match event {
            Event::Key(KeyEvent { code, .. }) => match code {
                KeyCode::Esc | KeyCode::Char('q') => self.current_screen = Screen::Help,
                _ => {}
            },
            _ => {}
        }
        Ok(false)
    }

    fn move_selection(&mut self, delta: i32) {
        let items_len = match self.state.current_pane {
            0 => self.state.permanent_items.len(),
            1 => self.state.recurring_items.len(),
            2 => self.state.recent_items.len(),
            _ => return,
        };

        if items_len == 0 {
            return;
        }

        let current = self.state.selected_indices[self.state.current_pane] as i32;
        let new_index = (current + delta).rem_euclid(items_len as i32) as usize;
        self.state.selected_indices[self.state.current_pane] = new_index;
    }

    fn change_pane(&mut self, delta: i32) {
        self.state.current_pane = ((self.state.current_pane as i32 + delta).rem_euclid(3)) as usize;
    }

    fn get_current_item(&self) -> Option<TimeItem> {
        let items = match self.state.current_pane {
            0 => &self.state.permanent_items,
            1 => &self.state.recurring_items,
            2 => &self.state.recent_items,
            _ => return None,
        };

        let index = self.state.selected_indices[self.state.current_pane];
        items.get(index).cloned()
    }

    fn toggle_current_item(&mut self) -> anyhow::Result<()> {
        if let Some(item) = self.get_current_item() {
            if self
                .state
                .active_timer
                .as_ref()
                .map(|(active, _)| active.name == item.name)
                .unwrap_or(false)
            {
                self.state.stop_timer()?;
            } else {
                self.state.start_timer(item)?;
            }
            self.state.save()?;
        }
        Ok(())
    }

    fn delete_current_item(&mut self) -> anyhow::Result<()> {
        // Check if this is the active timer
        let should_stop = {
            let items = match self.state.current_pane {
                0 => &self.state.permanent_items,
                1 => &self.state.recurring_items,
                2 => &self.state.recent_items,
                _ => return Ok(()),
            };

            let index = self.state.selected_indices[self.state.current_pane];

            if !items.is_empty() && index < items.len() {
                if let Some((ref active, _)) = self.state.active_timer {
                    items[index].name == active.name
                } else {
                    false
                }
            } else {
                return Ok(());
            }
        };

        // Stop timer if needed
        if should_stop {
            self.state.stop_timer()?;
        }

        // Now delete the item
        let items = match self.state.current_pane {
            0 => &mut self.state.permanent_items,
            1 => &mut self.state.recurring_items,
            2 => &mut self.state.recent_items,
            _ => return Ok(()),
        };

        let index = self.state.selected_indices[self.state.current_pane];

        if !items.is_empty() && index < items.len() {
            // Remove the item
            items.remove(index);

            // Adjust index if we're at the end
            if !items.is_empty() && index == items.len() {
                self.state.selected_indices[self.state.current_pane] = items.len() - 1;
            }

            // Save changes
            self.state.save()?;
        }

        Ok(())
    }

    fn set_status_message<S: Into<String>>(&mut self, message: S) {
        self.status_message = Some((message.into(), std::time::Instant::now()));
    }

    fn update_status_message(&mut self) {
        // Clear status message after 3 seconds
        if let Some((_, instant)) = self.status_message {
            if instant.elapsed().as_secs() >= 3 {
                self.status_message = None;
            }
        }
    }

    fn start_new_entry(&mut self) {
        self.current_screen = Screen::NewEntry;
        self.new_entry_buffer.clear();
        self.new_entry_project.clear();
        self.new_entry_cursor = 0;
        self.new_entry_mode = NewEntryMode::Task;
    }

    fn edit_app_config(&mut self) -> anyhow::Result<()> {
        use crossterm::{
            execute,
            terminal::{disable_raw_mode, enable_raw_mode},
            terminal::{EnterAlternateScreen, LeaveAlternateScreen},
        };
        use std::io::stdout;

        let editor = std::env::var("EDITOR").unwrap_or_else(|_| "vi".to_string());
        let config_path = Config::config_path()?;

        // Leave TUI mode
        disable_raw_mode()?;
        execute!(stdout(), LeaveAlternateScreen)?;

        // Run editor
        let status = Command::new(editor).arg(&config_path).status()?;

        if status.success() {
            // Reload entire application state
            self.config = Config::load()?;
            // Signal for complete reload
            self.current_screen = Screen::Main;
            self.needs_redraw = true;
        }

        // Return to TUI mode
        execute!(stdout(), EnterAlternateScreen)?;
        enable_raw_mode()?;

        Ok(())
    }

    fn edit_config(&mut self) -> anyhow::Result<()> {
        use crossterm::{
            execute,
            terminal::{disable_raw_mode, enable_raw_mode},
            terminal::{EnterAlternateScreen, LeaveAlternateScreen},
        };
        use std::io::stdout;

        let editor = std::env::var("EDITOR").unwrap_or_else(|_| "vi".to_string());
        let config_path = AppState::config_file()?;

        if !config_path.exists() {
            std::fs::write(&config_path, "# WAT Configuration\n# Add your permanent items here\n\npermanent_items:\n  - name: Daily Standup\n    tags: [daily, meeting]\n")?;
        }

        // Leave TUI mode
        disable_raw_mode()?;
        execute!(stdout(), LeaveAlternateScreen)?;

        // Run editor
        let status = Command::new(editor).arg(&config_path).status()?;

        if status.success() {
            // Reload entire application state
            self.state = AppState::load()?;
            // Signal for complete reload
            self.current_screen = Screen::Main;
            self.needs_redraw = true;
        }

        // Return to TUI mode
        execute!(stdout(), EnterAlternateScreen)?;
        enable_raw_mode()?;

        Ok(())
    }
}