use super::editor::{TextEditor, UnsavedAction};
use eframe::egui;

impl TextEditor {
    pub fn has_unsaved_changes(&self) -> bool {
        self.tabs.iter().any(|tab| tab.is_modified)
    }

    pub fn get_unsaved_files(&self) -> Vec<String> {
        self.tabs
            .iter()
            .filter(|tab| tab.is_modified)
            .map(|tab| tab.title.to_owned())
            .collect()
    }

    pub fn request_quit(&mut self, ctx: &egui::Context) {
        if self.has_unsaved_changes() && !self.state_cache {
            self.pending_unsaved_action = Some(UnsavedAction::Quit);
        } else {
            self.clean_quit_requested = true;
            if let Err(e) = self.save_state_cache() {
                eprintln!("Failed to save state cache: {e}");
            }
            ctx.send_viewport_cmd(egui::ViewportCommand::Close);
        }
    }

    pub fn force_quit(&mut self, ctx: &egui::Context) {
        self.force_quit_confirmed = true;
        if let Err(e) = self.save_state_cache() {
            eprintln!("Failed to save state cache: {e}");
        }
        ctx.send_viewport_cmd(egui::ViewportCommand::Close);
    }

    pub(crate) fn show_unsaved_changes_dialog(&mut self, ctx: &egui::Context) {
        let mut close_action_now = None;
        let mut cancel_action = false;

        let (files_to_list, title, confirmation_text, button_text, action) =
            if let Some(action) = &self.pending_unsaved_action {
                match action {
                    UnsavedAction::Quit => {
                        let files = self.get_unsaved_files();
                        let file_plural = if files.len() > 1 { "s" } else { "" };
                        (
                            files,
                            "Unsaved Changes".to_string(),
                            format!("File{file_plural} with unsaved changes:"),
                            "Quit Without Saving".to_string(),
                            action.to_owned(),
                        )
                    }
                    UnsavedAction::CloseTab(tab_index) => {
                        let file_name = self
                            .tabs
                            .get(*tab_index)
                            .map_or_else(|| "unknown file".to_string(), |tab| tab.title.to_owned());
                        (
                            vec![file_name],
                            "Unsaved Changes".to_string(),
                            "This file has unsaved changes:".to_string(),
                            "Close Without Saving".to_string(),
                            action.to_owned(),
                        )
                    }
                }
            } else {
                return;
            };

        let visuals = &ctx.style().visuals;
        let error_color = visuals.error_fg_color;

        egui::Window::new(title)
            .collapsible(false)
            .resizable(false)
            .anchor(egui::Align2::CENTER_CENTER, egui::Vec2::ZERO)
            .show(ctx, |ui| {
                ui.vertical_centered(|ui| {
                    ui.add_space(8.0);
                    ui.label(egui::RichText::new(&confirmation_text).size(14.0));
                    ui.add_space(4.0);

                    for file in &files_to_list {
                        ui.label(egui::RichText::new(file).size(12.0).color(error_color));
                    }

                    ui.add_space(12.0);

                    ui.horizontal(|ui| {
                        if ui.button("Cancel").clicked() {
                            cancel_action = true;
                        }

                        ui.add_space(8.0);

                        if ui
                            .button(egui::RichText::new(&button_text).color(error_color))
                            .clicked()
                        {
                            close_action_now = Some(action.to_owned());
                        }
                    });

                    ui.add_space(8.0);
                });
            });

        if cancel_action {
            self.pending_unsaved_action = None;
        }

        if let Some(action) = close_action_now {
            match action {
                UnsavedAction::Quit => {
                    if let Err(e) = self.save_state_cache() {
                        eprintln!("Failed to save state cache: {e}");
                    }
                    self.force_quit(ctx);
                }
                UnsavedAction::CloseTab(tab_index) => {
                    self.close_tab(tab_index);
                    if let Err(e) = self.save_state_cache() {
                        eprintln!("Failed to save state cache: {e}");
                    }
                }
            }
            self.pending_unsaved_action = None;
        }
    }
}