use crate::app::tab::Tab;
use crate::app::theme::Theme;
use eframe::egui;
use std::sync::{Arc, Mutex};
use std::thread;

#[derive(Clone, PartialEq)]
pub enum UnsavedAction {
    Quit,
    CloseTab(usize),
}

#[derive(Clone)]
pub struct TextProcessingResult {
    pub line_count: usize,
    pub longest_line_index: usize,     // Which line is the longest (0-based)
    pub longest_line_length: usize,    // Character count of the longest line
    pub longest_line_pixel_width: f32, // Actual pixel width of the longest line
}

impl Default for TextProcessingResult {
    fn default() -> Self {
        Self {
            line_count: 1,
            longest_line_index: 0,
            longest_line_length: 0,
            longest_line_pixel_width: 0.0,
        }
    }
}

#[derive()]
pub struct TextEditor {
    pub(crate) tabs: Vec<Tab>,
    pub(crate) active_tab_index: usize,
    pub(crate) tab_counter: usize, // Counter for numbering new tabs
    pub(crate) show_about: bool,
    pub(crate) show_shortcuts: bool,
    pub(crate) show_find: bool,
    pub(crate) show_preferences: bool,
    pub(crate) pending_unsaved_action: Option<UnsavedAction>,
    pub(crate) force_quit_confirmed: bool,
    pub(crate) clean_quit_requested: bool,
    pub(crate) show_line_numbers: bool,
    pub(crate) word_wrap: bool,
    pub(crate) auto_hide_toolbar: bool,
    pub(crate) auto_hide_tab_bar: bool,
    pub(crate) theme: Theme,
    pub(crate) line_side: bool,
    pub(crate) font_family: String,
    pub(crate) font_size: f32,
    pub(crate) font_size_input: Option<String>,
    pub(crate) zoom_factor: f32,
    pub(crate) menu_interaction_active: bool,
    pub(crate) tab_bar_rect: Option<egui::Rect>,
    pub(crate) menu_bar_stable_until: Option<std::time::Instant>,
    pub(crate) text_processing_result: Arc<Mutex<TextProcessingResult>>,
    pub(crate) processing_thread_handle: Option<thread::JoinHandle<()>>,
    pub(crate) find_query: String,
    pub(crate) find_matches: Vec<(usize, usize)>, // (start_pos, end_pos) byte positions
    pub(crate) current_match_index: Option<usize>,
    pub(crate) case_sensitive_search: bool,
    pub(crate) prev_show_find: bool, // Track previous state to detect transitions
    
    // Cursor tracking for smart scrolling
    pub(crate) previous_cursor_position: Option<usize>,
    
    // Track previous content for incremental processing
    pub(crate) previous_content: String,
    pub(crate) previous_cursor_char_index: Option<usize>,
    pub(crate) current_cursor_line: usize,        // Track current line number incrementally
    pub(crate) previous_cursor_line: usize,       // Track previous line for comparison
    pub(crate) font_settings_changed: bool,      // Flag to trigger text reprocessing when font changes
}