extern crate sdl2;
extern crate sdl2_gfx;

use sdl2::event::Event;
use sdl2::pixels;
use sdl2::keyboard::Keycode;

use sdl2_gfx::primitives::DrawRenderer;

const SCREEN_WIDTH: u32 = 800;
const SCREEN_HEIGHT: u32 = 600;

// hadle the annoying Rect i32
macro_rules! rect(
    ($x:expr, $y:expr, $w:expr, $h:expr) => (
        sdl2::rect::Rect::new($x as i32, $y as i32, $w as i32, $h as i32)
    )
);

fn main() {

    let sdl_context = sdl2::init().unwrap();
    let video_subsys = sdl_context.video().unwrap();
    let window = video_subsys.window("rust-sdl2_gfx: draw line & FPSManager", SCREEN_WIDTH, SCREEN_HEIGHT)
        .position_centered()
        .opengl()
        .build()
        .unwrap();

    let mut renderer = window.renderer().build().unwrap();

    renderer.set_draw_color(pixels::Color::RGB(0, 0, 0));
    renderer.clear();
    renderer.present();

    let mut lastx = 0;
    let mut lasty = 0;

    let mut events = sdl_context.event_pump().unwrap();

    'main: loop {
        for event in events.poll_iter() {

            match event {

                Event::Quit {..} => break 'main,

                Event::KeyDown {keycode: Some(keycode), ..} => {
                    if keycode == Keycode::Escape {
                        break 'main
                    } else if keycode == Keycode::Space {
                        println!("space down");
                        for i in 0..400 {
                            renderer.pixel(i as i16, i as i16, 0xFF000FFu32).unwrap();
                        }
                        renderer.present();

                    }
                }

                Event::MouseButtonDown {x, y, ..} => {
                    let color = pixels::Color::RGB(x as u8, y as u8, 255);
                    let _ = renderer.line(lastx, lasty, x as i16, y as i16, color);
                    lastx = x as i16;
                    lasty = y as i16;
                    println!("mouse btn down at ({},{})", x, y);
                    renderer.present();
                }

                _ => {}
            }
        }
    }
}