use gtk4 as gtk;

use gtk::prelude::*;
use libcosmic::x;
use std::{
    cell::RefCell,
    rc::Rc,
};

use self::ipc::LauncherIpc;
mod ipc;

fn icon_source(icon: &gtk::Image, source: &Option<pop_launcher::IconSource>) {
    match source {
        Some(pop_launcher::IconSource::Name(name)) => {
            icon.set_from_icon_name(Some(name));
        },
        Some(pop_launcher::IconSource::Mime(content_type)) => {
            icon.set_from_gicon(
                &gio::content_type_get_icon(content_type)
            );
        },
        _ => {
            icon.set_from_icon_name(None);
        }
    }
}

fn main() {
    let launcher = Rc::new(RefCell::new(
        LauncherIpc::new().expect("failed to connect to launcher service")
    ));

    let app = gtk::Application::builder()
        .application_id("com.system76.Launcher")
        .build();

    app.connect_activate(move |app| {
        let window = gtk::ApplicationWindow::builder()
            .application(app)
            .decorated(false)
            .default_width(480)
            .default_height(440)
            .title("Launcher")
            .build();

        let vbox = gtk::Box::new(gtk::Orientation::Vertical, 16);
        vbox.set_margin_start(16);
        vbox.set_margin_end(16);
        vbox.set_margin_top(16);
        vbox.set_margin_bottom(16);
        window.set_child(Some(&vbox));

        let search = gtk::Entry::new();
        search.set_placeholder_text(Some(" Type to search apps, or type '?' for more options."));
        vbox.append(&search);

        let listbox = gtk::ListBox::new();
        vbox.append(&listbox);

        {
            let launcher = launcher.clone();
            let search_changed = move |search: &gtk::Entry| {
                //TODO: is this the best way to clear a listbox?
                while let Some(child) = listbox.last_child() {
                    listbox.remove(&child);
                }

                let response_res = launcher.borrow_mut().request(
                    pop_launcher::Request::Search(search.text().to_string())
                );

                println!("{:#?}", response_res);

                if let Ok(pop_launcher::Response::Update(results)) = response_res {
                    for (i, result) in results.iter().enumerate() {
                        // Limit to 9 results
                        if i >= 9 { continue; }

                        let row = gtk::ListBoxRow::new();
                        listbox.append(&row);

                        // Select first row
                        if i == 0 {
                            listbox.select_row(Some(&row));
                        }

                        let hbox = gtk::Box::new(gtk::Orientation::Horizontal, 8);
                        hbox.set_margin_start(8);
                        hbox.set_margin_end(8);
                        hbox.set_margin_top(8);
                        hbox.set_margin_bottom(8);
                        row.set_child(Some(&hbox));

                        let category_icon = gtk::Image::new();
                        category_icon.set_pixel_size(16);
                        icon_source(&category_icon, &result.category_icon);
                        hbox.append(&category_icon);

                        let icon = gtk::Image::new();
                        icon.set_pixel_size(32);
                        icon_source(&icon, &result.icon);
                        hbox.append(&icon);

                        let labels = gtk::Box::new(gtk::Orientation::Vertical, 4);
                        hbox.append(&labels);

                        let name = gtk::Label::new(Some(&result.name));
                        name.set_halign(gtk::Align::Start);
                        labels.append(&name);

                        let description = gtk::Label::new(Some(&result.description));
                        description.set_halign(gtk::Align::Start);
                        labels.append(&description);
                    }
                }
            };

            search.connect_changed(search_changed.clone());

            search_changed(&search);
        }

        // Setting the window to dialog type must happen between realize and show. Dialog windows
        // show up centered on the display with the cursor, so we do not have to set position
        window.connect_realize(move |window| {
            if let Some((display, surface)) = x::get_window_x11(window) {
                unsafe {
                    x::change_property(
                        &display,
                        &surface,
                        "_NET_WM_WINDOW_TYPE",
                        x::PropMode::Replace,
                        &[x::Atom::new(&display, "_NET_WM_WINDOW_TYPE_DIALOG").unwrap()],
                    );
                }
            } else {
                println!("failed to get X11 window");
            }
        });

        window.show();
    });

    app.run();
}