use std::cell::{RefCell, RefMut};
use std::rc::Rc;

use adw::{Clamp, ToolbarView, prelude::*};

use adw::{ActionRow, Application, ApplicationWindow, HeaderBar};
use gtk::{
    Box, Button, CssProvider, Grid, GridLayout, Label, ListBox, Orientation, PasswordEntry,
    SelectionMode,
};

use crate::pipe;
use glib::clone;

fn build_ui(
    app: &Application,
    ctg_pipe: async_channel::Receiver<crate::pipe::CardToGUI>,
    gtc_pipe: async_channel::Sender<crate::pipe::GUIToCard>,
) {
    let main_box = Box::builder().orientation(Orientation::Vertical).build();

    let password_grid = Grid::new();

    let password_mask: Vec<Button> = (0..5)
        .map(|f| {
            Button::builder()
                .name(format!("button_{}", f))
                .icon_name("")
                .can_focus(false)
                .can_target(false)
                .hexpand(true)
                .css_classes(&["cell"][..])
                .build()
        })
        .collect();

    for i in 0..5 {
        password_grid.attach(&password_mask[i], i as i32, 0, 1, 1);
    }

    let password_field = PasswordEntry::builder()
        .margin_bottom(12)
        .width_request(5)
        .width_chars(0)
        .css_classes(&["invisible"][..])
        .build();

    password_grid.attach(&password_field, 0, 0, 5, 1);

    password_field.connect_changed(move |v| {
        let count = v.text().len();
        for i in 0..5 {
            password_mask[i].set_icon_name(if count > i {
                "window-close-symbolic"
            } else {
                ""
            });
        }

        if count > 5 {
            v.delete_text(5, -1);
        }
    });

    let info_label = Label::builder()
        .label("...Processing")
        .margin_bottom(12)
        .build();

    let button = Button::builder().label("Next").sensitive(false).build();

    main_box.append(&info_label);
    main_box.append(&password_grid);
    main_box.append(&button);

    let headerbar = HeaderBar::new();
    let toolbar_view = ToolbarView::new();
    toolbar_view.add_top_bar(&headerbar);

    let c = Clamp::builder()
        .child(&main_box)
        .margin_end(16)
        .margin_start(16)
        .margin_end(16)
        .build();
    toolbar_view.set_content(Some(&c));

    let window = ApplicationWindow::builder()
        .application(app)
        .title("Log in with DigiD")
        .default_width(350)
        // add content to window
        .content(&toolbar_view)
        .build();

    password_field.connect_activate(clone!(
        #[weak]
        button,
        move |_| {
            button.emit_clicked();
        }
    ));

    button.connect_clicked(clone!(
        #[weak]
        password_field,
        move |btn| {
            btn.set_sensitive(false);
            let pass = password_field.text().to_string();
            gtc_pipe.send_blocking(pipe::GUIToCard::PIN(pass)).unwrap();
        }
    ));

    gdk::glib::spawn_future_local(clone!(
        #[weak]
        info_label,
        #[weak]
        button,
        #[weak]
        window,
        #[weak]
        app,
        #[weak]
        password_field,
        async move {
            while let Ok(msg) = ctg_pipe.recv().await {
                match msg {
                    pipe::CardToGUI::AuthenticationTarget { target } => {
                        info_label.set_text(&format!("Enter your PIN to log in to {}", target));
                    }

                    pipe::CardToGUI::WaitForCard => {
                        button.set_sensitive(false);
                        button.set_label("Place your card on the reader.");
                    }
                    pipe::CardToGUI::ReadyForPIN { message } => {
                        let no_special = message.is_none();
                        button.set_label(&message.unwrap_or_else(|| String::from("Next")));
                        button.set_sensitive(true);

                        if no_special && password_field.text().len() == 5 {
                            button.emit_clicked();
                        }
                    }
                    pipe::CardToGUI::ProcessingStep { step: _ } => {}
                    pipe::CardToGUI::ProcessingMessage { message } => {
                        button.set_label(&message);
                    }

                    pipe::CardToGUI::Done => {
                        window.close();
                        app.quit();
                    }
                }
            }
        }
    ));

    window.connect_has_focus_notify(move |f| {
        if f.has_focus() {
            password_field.grab_focus();
        }
    });

    window.present();
}

pub fn run_gui(
    ctg_pipe_r: async_channel::Receiver<crate::pipe::CardToGUI>,
    gtc_pipe_s: async_channel::Sender<crate::pipe::GUIToCard>,
) {
    let application = Application::builder()
        .application_id("moe.puck.XeniD")
        .build();

    let ctg_pipe_r = RefCell::new(Some(ctg_pipe_r));
    let gtc_pipe_s = RefCell::new(Some(gtc_pipe_s));

    application.connect_activate(move |app| {
        let provider = CssProvider::new();
        provider
            .load_from_string(".cell { margin: 6px; padding: 18px; } .invisible { opacity: 0; }");

        gtk::style_context_add_provider_for_display(
            &gdk::Display::default().expect("Could not connect to a display."),
            &provider,
            gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
        );

        build_ui(app, ctg_pipe_r.take().unwrap(), gtc_pipe_s.take().unwrap());
    });

    application.run_with_args::<glib::GString>(&[]);
}