use bezier::Bezier;

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

use gl::types::*;

fn main() {
    let mut curve = Bezier::new();

    let sdl_context = sdl2::init().unwrap();
    let video_subsystem = sdl_context.video().unwrap();

    let gl_attr = video_subsystem.gl_attr();

    gl_attr.set_context_profile(sdl2::video::GLProfile::Core);
    gl_attr.set_context_version(4, 1);

    let window_w: u32 = 800;
    let window_h: u32 = 600;

    let window = video_subsystem
        .window("bezier", window_w, window_h)
        .position_centered()
        .opengl()
        .build()
        .unwrap();

    let _gl_context = window.gl_create_context().unwrap();

    gl::load_with(|s| video_subsystem.gl_get_proc_address(s) as *const std::os::raw::c_void);

    let vertices: [f32; 18] = [
        1.0, 1.0, 0.0, 1.0, -1.0, 0.0, -1.0, 1.0, 0.0, 1.0, -1.0, 0.0, -1.0, -1.0, 0.0, -1.0, 1.0, 0.0,
    ];

    let mut vbo: GLuint = 0;
    let mut vao: GLuint = 0;
    unsafe {
        gl::Viewport(0, 0, window_w as i32, window_h as i32);
        gl::GenVertexArrays(1, &mut vao);
        gl::BindVertexArray(vao);
        gl::GenBuffers(1, &mut vbo);
        gl::BindBuffer(gl::ARRAY_BUFFER, vbo);
        gl::BufferData(
            gl::ARRAY_BUFFER,
            (vertices.len() * std::mem::size_of::<f32>()) as GLsizeiptr,
            vertices.as_ptr() as *const GLvoid,
            gl::STATIC_DRAW,
        );
        gl::VertexAttribPointer(
            0,
            3,
            gl::FLOAT,
            gl::FALSE,
            (3 * std::mem::size_of::<f32>()) as GLint,
            std::ptr::null(),
        );
        gl::EnableVertexAttribArray(0);
    }

    let mut event_pump = sdl_context.event_pump().unwrap();
    'running: loop {
        let x = event_pump.mouse_state().x();
        let y = event_pump.mouse_state().y();
        let left_click = event_pump.mouse_state().left();
        for event in event_pump.poll_iter() {
            match event {
                Event::Quit { .. }
                | Event::KeyDown {
                    keycode: Some(Keycode::Escape),
                    ..
                } => break 'running,
                Event::KeyDown {
                    keycode: Some(Keycode::A),
                    ..
                } => {
                    curve.push(x, window_h as i32 - y);
                    curve.draw();
                },
                Event::MouseMotion { .. } => {
                    if left_click {
                        curve.grab_closer(x as f32, (window_h as i32 - y) as f32);
                        curve.draw();
                    }
                }
                _ => {}
            }
        }

        unsafe {
            gl::Clear(gl::COLOR_BUFFER_BIT);
            gl::DrawArrays(gl::TRIANGLES, 0, 6);
        }

        window.gl_swap_window();
    }
}