mod color_scheme;
mod composite_icon;
mod config;
mod icon_index;
mod ui;

use gtk::prelude::*;
use gtk::{glib, Application, ApplicationWindow, Stack};
use std::path::{Path, PathBuf};
use crate::color_scheme::ColorScheme;
use crate::composite_icon::CompositeIcon;
use std::cell::RefCell;
use std::rc::Rc;

const APP_ID: &str = "dev.rootiest.IconColorTool";

fn main() -> glib::ExitCode {
    let app = Application::builder().application_id(APP_ID).build();

    app.connect_activate(|app| {
        let breeze_path = match config::load_breeze_path() {
            Ok(p) => p,
            Err(e) => {
                eprintln!("Failed to resolve breeze-icons path: {e:#}");
                std::process::exit(1);
            }
        };

        let initial_arg = std::env::args().nth(1);
        let initial_icon = initial_arg
            .as_deref()
            .map(|a| resolve_icon_arg(a, &breeze_path));

        if let Some(Err(e)) = &initial_icon {
            eprintln!("Error: {e}");
            std::process::exit(1);
        }

        let window = ApplicationWindow::builder()
            .application(app)
            .title("Icon Color Tool")
            .default_width(900)
            .default_height(800)
            .build();

        let stack = Stack::new();
        window.set_child(Some(&stack));

        let current_composite: Rc<RefCell<Option<Rc<RefCell<CompositeIcon>>>>> = Rc::new(RefCell::new(None));

        {
            let current_composite = Rc::clone(&current_composite);
            let window_clone = window.clone();
            window.connect_close_request(move |_| {
                if let Some(comp) = current_composite.borrow().as_ref() {
                    if comp.borrow().is_modified {
                        let dialog = gtk::AlertDialog::builder()
                            .message("You have unsaved changes. Are you sure you want to close?")
                            .detail("All unsaved changes will be lost.")
                            .buttons(["Cancel", "Discard"])
                            .cancel_button(0)
                            .default_button(1)
                            .build();
                        
                        let window_clone2 = window_clone.clone();
                        let comp_ref = Rc::clone(&current_composite);
                        dialog.choose(Some(&window_clone), gtk::gio::Cancellable::NONE, move |res| {
                            if let Ok(1) = res {
                                if let Some(c) = comp_ref.borrow().as_ref() {
                                    c.borrow_mut().is_modified = false;
                                }
                                window_clone2.close();
                            }
                        });
                        return glib::Propagation::Stop;
                    }
                }
                glib::Propagation::Proceed
            });
        }

        build_picker(&stack, &window, breeze_path.clone(), Rc::clone(&current_composite));

        if let Some(Ok(path)) = initial_icon {
            build_editor(&stack, &window, path, breeze_path, Rc::clone(&current_composite));
        }

        window.present();
    });

    app.run()
}

fn resolve_icon_arg(arg: &str, breeze_path: &Path) -> anyhow::Result<PathBuf> {
    let as_given = PathBuf::from(arg);
    if as_given.is_absolute() {
        anyhow::ensure!(
            as_given.exists(),
            "Icon not found at {}",
            as_given.display()
        );
        return Ok(as_given);
    }
    if as_given.exists() {
        return Ok(as_given.canonicalize()?);
    }
    let under_breeze = breeze_path.join(arg);
    anyhow::ensure!(
        under_breeze.exists(),
        "Icon not found at {} or {}",
        as_given.display(),
        under_breeze.display()
    );
    Ok(under_breeze.canonicalize()?)
}

fn build_picker(stack: &Stack, window: &ApplicationWindow, breeze_path: PathBuf, current_composite: Rc<RefCell<Option<Rc<RefCell<CompositeIcon>>>>>) {
    let stack_for_callback = stack.clone();
    let window_for_callback = window.clone();
    let breeze_for_editor = breeze_path.clone();
    let comp_callback = Rc::clone(&current_composite);
    
    let widget = ui::picker::build_picker_page(breeze_path, move |icon_path| {
        build_editor(&stack_for_callback, &window_for_callback, icon_path, breeze_for_editor.clone(), Rc::clone(&comp_callback));
    });
    stack.add_named(&widget, Some("picker"));
    stack.set_visible_child_name("picker");
}

fn build_editor(stack: &Stack, window: &ApplicationWindow, icon_path: PathBuf, breeze_path: PathBuf, current_composite: Rc<RefCell<Option<Rc<RefCell<CompositeIcon>>>>>) {
    let mut scheme = match ColorScheme::load(&icon_path) {
        Ok(s) => s,
        Err(e) => {
            eprintln!("Failed to open {}: {e:#}", icon_path.display());
            return;
        }
    };
    scheme.auto_save = false;
    
    let composite = Rc::new(RefCell::new(CompositeIcon::new(scheme)));
    *current_composite.borrow_mut() = Some(Rc::clone(&composite));
    
    let editor_container = gtk::Box::new(gtk::Orientation::Vertical, 0);
    
    let rebuild_editor = {
        let composite = Rc::clone(&composite);
        let stack = stack.clone();
        let window = window.clone();
        let editor_container = editor_container.clone();
        let current_comp = Rc::clone(&current_composite);
        
        Rc::new(move || {
            while let Some(child) = editor_container.first_child() {
                editor_container.remove(&child);
            }
            
            let stack_clone = stack.clone();
            let stack_emblem = stack.clone();
            let window_clone = window.clone();
            let comp = Rc::clone(&composite);
            let comp_for_back = Rc::clone(&comp);
            let current_comp_for_back = Rc::clone(&current_comp);
            
            let page = ui::editor::build_editor_page(
                Rc::clone(&composite),
                move || {
                    if comp_for_back.borrow().is_modified {
                        let dialog = gtk::AlertDialog::builder()
                            .message("You have unsaved changes. Are you sure you want to discard them?")
                            .detail("All unsaved changes will be lost.")
                            .buttons(["Cancel", "Discard"])
                            .cancel_button(0)
                            .default_button(1)
                            .build();
                        
                        let stack_clone = stack_clone.clone();
                        let comp_ref = Rc::clone(&current_comp_for_back);
                        dialog.choose(Some(&window_clone), gtk::gio::Cancellable::NONE, move |res| {
                            if let Ok(1) = res {
                                *comp_ref.borrow_mut() = None;
                                stack_clone.set_visible_child_name("picker");
                            }
                        });
                    } else {
                        *current_comp_for_back.borrow_mut() = None;
                        stack_clone.set_visible_child_name("picker");
                    }
                },
                move || {
                    stack_emblem.set_visible_child_name("emblem_picker");
                },
                {
                    let window_clone = window.clone();
                    let comp = Rc::clone(&comp);
                    move || {
                        let filter = gtk::FileFilter::new();
                        filter.set_name(Some("SVG Images"));
                        filter.add_mime_type("image/svg+xml");
                        filter.add_pattern("*.svg");
                        
                        let filters = gtk::gio::ListStore::new::<gtk::FileFilter>();
                        filters.append(&filter);

                        let dialog = gtk::FileDialog::builder()
                            .title("Save Composite Icon As...")
                            .filters(&filters)
                            .default_filter(&filter)
                            .build();
                        let c = Rc::clone(&comp);
                        dialog.save(Some(&window_clone), gtk::gio::Cancellable::NONE, move |res| {
                            if let Ok(file) = res {
                                if let Some(path) = file.path() {
                                    let rendered = c.borrow().render();
                                    if let Err(e) = std::fs::write(&path, rendered) {
                                        eprintln!("Failed to save composite to {}: {e}", path.display());
                                    } else {
                                        c.borrow_mut().is_modified = false;
                                    }
                                }
                            }
                        });
                    }
                }
            );
            editor_container.append(&page);
        })
    };
    
    rebuild_editor();

    if let Some(existing) = stack.child_by_name("editor") {
        stack.remove(&existing);
    }
    stack.add_named(&editor_container, Some("editor"));
    
    let rebuild_editor_clone = Rc::clone(&rebuild_editor);
    let stack_emblem_callback = stack.clone();
    let comp_for_picker = Rc::clone(&composite);
    
    let emblem_picker = ui::picker::build_picker_page(breeze_path, move |emblem_path| {
        if let Ok(mut emblem_scheme) = ColorScheme::load_with_namespace(&emblem_path, "Emblem") {
            emblem_scheme.auto_save = false;
            let mut c = comp_for_picker.borrow_mut();
            c.set_emblem(emblem_scheme);
            c.is_modified = true;
            drop(c);
            rebuild_editor_clone();
            stack_emblem_callback.set_visible_child_name("editor");
        } else {
            eprintln!("Failed to load emblem: {}", emblem_path.display());
        }
    });
    
    if let Some(existing) = stack.child_by_name("emblem_picker") {
        stack.remove(&existing);
    }
    stack.add_named(&emblem_picker, Some("emblem_picker"));

    stack.set_visible_child_name("editor");
}