use gooey::value::{Dynamic, MapEach};
use gooey::widget::MakeWidget;
use gooey::{Application, Open, PendingApp, Run};

fn main() -> gooey::Result {
    let app = PendingApp::default();

    let open_windows = Dynamic::new(0_usize);
    let counter = Dynamic::new(0_usize);

    (&open_windows, &counter)
        .map_each(|(open, counter)| {
            format!(
                "There are {open} other window(s) open. {counter} total windows have been opened"
            )
        })
        .and(open_window_button(&app, &open_windows, &counter))
        .into_rows()
        .centered()
        .open(&app)?;

    app.run()
}

fn open_window_button(
    app: &impl Application,
    open_windows: &Dynamic<usize>,
    counter: &Dynamic<usize>,
) -> impl MakeWidget {
    let app = app.as_app();
    let open_windows = open_windows.clone();
    let counter = counter.clone();
    "Open Another Window".into_button().on_click(move |()| {
        open_another_window(&app, &open_windows, &counter);
    })
}

fn open_another_window(
    app: &impl Application,
    open_windows: &Dynamic<usize>,
    counter: &Dynamic<usize>,
) {
    let my_number = counter.map_mut(|count| {
        *count += 1;
        *count
    });
    let open_windows = open_windows.clone();
    open_windows.map_mut(|open_windows| *open_windows += 1);
    format!("This is window {my_number}")
        .and(open_window_button(app, &open_windows, counter))
        .into_rows()
        .centered()
        .into_window()
        .on_close(move || open_windows.map_mut(|open_windows| *open_windows -= 1))
        .open(app)
        .expect("error opening another window");
}