extern crate gtk;

use gtk::prelude::*;
use gtk::{LevelBar, LevelBarExt, Window, WindowType};

pub struct Gui {
    level_bar: gtk::LevelBar,
}

impl Gui {
    pub fn new(title: &str) -> Self {
        let window = Window::new(WindowType::Toplevel);
        window.set_title(title);
        window.set_default_size(350, 70);

        window.connect_delete_event(|_, _| {
            gtk::main_quit();
            Inhibit(false)
        });

        let level_bar = LevelBar::new();
        window.add(&level_bar);
        window.show_all();

        Self {
            level_bar: level_bar,
        }
    }

    pub fn set_level(&self, level: f64) {
        self.level_bar.set_value(level);
    }
}

pub fn add_timeout<F>(interval: u32, mut func: F)
where
    F: FnMut() + 'static,
{
    gtk::timeout_add(interval, move || {
        func();
        Continue(true)
    });
}

pub fn init() -> Result<(), String> {
    gtk::init().map_err(|_| "Failed to initialize GTK")?;
    Ok(())
}

pub fn run() {
    gtk::main();
}