extern crate gtk;
use gtk::prelude::*;
use gtk::{Button, Window, WindowType};
enum Operators {
    PLUS,
    MINUS,
    DIVIDE,
    MULTIPLY,
}
struct calc {
    left: Option<u32>,
    right: Option<u32>,
    operator: Option<Operators>,
}
impl calc {
    fn handle_number(&mut self, button: gtk::Button) {
        match self {
            calc {
                left: l,
                right: r,
                operator: None,
            } => match l {
                Some(n) => {let s = n.to_string() + &button.get_label().unwrap();
                    self.left = Some(s.parse::<u32>().unwrap());
                    ()
                }
            },
            calc {
                left: Some(l),
                right: r,
                operator: Some(o),
            } => {}
        }
    }
    fn eval(&mut self) -> Self {
        calc {
            left: None,
            right: None,
            operator: None,
        }
    }
}
fn main() {
    if gtk::init().is_err() {
        println!("failed to init GTK");
        return;
    }
    let window: Window = Window::new(WindowType::Toplevel);
    window.set_title("Rust calc");
    let container = gtk::Box::new(gtk::Orientation::Vertical, 1);
    // row 1
    let row1 = gtk::Box::new(gtk::Orientation::Horizontal, 1);
    let button1 = Button::new_with_label("1");
    row1.add(&button1);
    button1.connect_clicked(|but| println!("{}", but.get_label().unwrap()));
    let button2 = Button::new_with_label("2");
    row1.add(&button2);
    let button3 = Button::new_with_label("3");
    row1.add(&button3);
    // row 2
    let row2 = gtk::Box::new(gtk::Orientation::Horizontal, 1);
    let button4 = Button::new_with_label("4");
    row2.add(&button4);
    let button5 = Button::new_with_label("5");
    row2.add(&button5);
    let button6 = Button::new_with_label("6");
    row2.add(&button6);
    // row 3
    let row3 = gtk::Box::new(gtk::Orientation::Horizontal, 1);
    let button7 = Button::new_with_label("7");
    row3.add(&button7);
    let button8 = Button::new_with_label("8");
    row3.add(&button8);
    let button9 = Button::new_with_label("9");
    row3.add(&button9);
    // row 4
    let row4 = gtk::Box::new(gtk::Orientation::Horizontal, 1);
    let button0 = Button::new_with_label("0");
    row4.add(&button0);
    let button_sub = Button::new_with_label("-");
    row4.add(&button_sub);
    let button_add = Button::new_with_label("+");
    row4.add(&button_add);
    // row 5
    let row5 = gtk::Box::new(gtk::Orientation::Horizontal, 1);
    let button_mult = Button::new_with_label("*");
    row5.add(&button_mult);
    let button_div = Button::new_with_label("/");
    row5.add(&button_div);
    let button_equals = Button::new_with_label("=");
    row5.add(&button_equals);
    // add rows to window
    container.add(&row1);
    container.add(&row2);
    container.add(&row3);
    container.add(&row4);
    container.add(&row5);
    window.add(&container);
    window.show_all();
    window.connect_delete_event(|_, _| {
        gtk::main_quit();
        Inhibit(false)
    });
    gtk::main();
}