extern crate minifb;

use minifb::{CursorStyle, Window, Key, Scale, WindowOptions, MouseMode};

const WIDTH: usize = 640;
const HEIGHT: usize = 360;

struct Rect {
    x: usize,
    y: usize,
    width: usize,
    height: usize,
    color: u32,
    cursor_style: CursorStyle,
}

impl Rect {
    pub fn is_inside(&self, xf: f32, yf: f32) -> bool {
        let x = xf as usize;
        let y = yf as usize;
        let xe = self.x + self.width;
        let ye = self.y + self.height;

        if (y >= self.y) && (y <= ye) &&
           (x >= self.x) && (x <= xe) {
            true
        } else {
            false
        }
    }
}

fn fill_rect(dest: &mut [u32], rect: &Rect) {
    for y in 0..rect.height {
        for x in 0..rect.width {
            dest[((rect.y + y) * WIDTH) + rect.x + x] = rect.color;
        }
    }
}

fn main() {
    let mut buffer: Vec<u32> = vec![0; WIDTH * HEIGHT];

    let mut window = Window::new("I haz no title :(",
                                 WIDTH,
                                 HEIGHT,
                                 WindowOptions {
                                     resize: true,
                                     scale: Scale::X2,
                                     ..WindowOptions::default()
                                 })
                         .expect("Unable to Open Window");
    let rects = [
        Rect { x: 0, y: 0, width: 160, height: 180, color: 0x00b27474, cursor_style: CursorStyle::Arrow },
        Rect { x: 160, y: 0, width: 160, height: 180, color: 0x00b28050, cursor_style: CursorStyle::Ibeam },
        Rect { x: 320, y: 0, width: 160, height: 180, color: 0x00a9b250, cursor_style: CursorStyle::Crosshair },
        Rect { x: 480, y: 0, width: 160, height: 180, color: 0x0060b250, cursor_style: CursorStyle::ClosedHand },
        Rect { x: 0, y: 180, width: 160, height: 180, color: 0x004fb292, cursor_style: CursorStyle::OpenHand },
        Rect { x: 160, y: 180, width: 160, height: 180, color: 0x004f71b2, cursor_style: CursorStyle::ResizeLeftRight },
        Rect { x: 320, y: 180, width: 160, height: 180, color: 0x008850b2, cursor_style: CursorStyle::ResizeUpDown },
        Rect { x: 480, y: 180, width: 160, height: 180, color: 0x00b25091, cursor_style: CursorStyle::ResizeAll }
    ];

    window.set_title("Different cursor on each color region");

    while window.is_open() && !window.is_key_down(Key::Escape) {
        let (mx, my) = window.get_mouse_pos(MouseMode::Clamp).unwrap();

        for rect in &rects {
            fill_rect(&mut buffer, rect);
            if rect.is_inside(mx, my) {
                window.set_cursor_style(rect.cursor_style);
            }
        }

        // We unwrap here as we want this code to exit if it fails
        window.update_with_buffer(&buffer).unwrap();
    }
}