use std::convert::TryInto;
//use glfw;
//use glfw::{Action, Context, Key};
use cgmath::{Matrix4, vec3, Point3, Deg, perspective};
use cgmath::prelude::*;
use std::sync::Arc;
const SCR_WIDTH: u32 = 1600;
const SCR_HEIGHT: u32 = 900;
const TITLE: &str = "GLFWtest";


use glow::*;
use sdl2;
use sdl2::pixels::Color;

use sdl2::keyboard::Keycode;
use sdl2::event::Event;
use std::sync::mpsc::Receiver;
use std::ptr;
use std::mem;
use std::os::raw::c_void;
use std::path::Path;
use std::ffi::{CString, CStr};
mod shader;
mod model;
mod camera;
fn main() {

    //let mut glfw = glfw::init(glfw::FAIL_ON_ERRORS).unwrap();

    // glfw.window_hint(glfw::WindowHint::ContextVersion(3, 3));
    // glfw.window_hint(glfw::WindowHint::OpenGlProfile(glfw::OpenGlProfileHint::Core));
    // glfw.window_hint(glfw::WindowHint::OpenGlForwardCompat(true));
    // glfw.window_hint(glfw::WindowHint::Resizable(false));
    // glfw.window_hint(glfw::WindowHint::TransparentFramebuffer(false));
    // glfw.window_hint(glfw::WindowHint::Decorated(true));

    // let (mut window, events) = glfw.create_window(SCR_WIDTH, SCR_HEIGHT, TITLE, glfw::WindowMode::Windowed).unwrap();

    //let (screen_width, screen_height) = window.get_framebuffer_size();


    let (gl, shader_version, window, mut events_loop, _context) = {
        let sdl = match sdl2::init()
            {
                Ok(sdl) => sdl,
                Err(s) => panic!("Error with Initializing SDL: {}", s),
            };
        let video = sdl.video().unwrap();
        let gl_attr = video.gl_attr();
        gl_attr.set_context_profile(sdl2::video::GLProfile::Core);
        gl_attr.set_context_version(3, 3);
        let window = match video
            .window("DairyTest", SCR_WIDTH, SCR_HEIGHT)
            .opengl()
            .resizable()
            .build() {
                Ok(ret) => ret,
                Err(s) => panic!("Error with Initializing SDL Window: {}", s),
            };



        let gl_context = match window.gl_create_context()
            {
                Ok(ret) => ret,
                Err(s) => panic!("Error with Initializing SDL Context: {}", s)
            };
        let gl = std::sync::Arc::new(unsafe{glow::Context::from_loader_function(|s| video.gl_get_proc_address(s) as *const _)});

        let event_loop = match sdl.event_pump()
            {
                Ok(ret) => ret,
                Err(s) => panic!("Error with Initializing SDL Event Loop: {}", s)
            };
        (gl, "#version 330", window, event_loop, gl_context)

    };

    let mut camera = camera::Camera {
        Position: Point3::new(0.0, 0.40, 1.0),
        Pitch: -20.0,
        ..camera::Camera::default()
    };

    let mut firstMouse = true;
    let mut lastX: f32 = SCR_WIDTH as f32 / 2.0;
    let mut lastY: f32 = SCR_HEIGHT as f32 / 2.0;

    // timing
    let mut deltaTime: f32; // time between current frame and last frame
    let mut lastFrame: f32 = 0.0;

    //gl::load_with(|ptr| window.get_proc_address(ptr) as *const _);
    let (ourshader, ourModel) = unsafe {
        gl.enable(glow::DEPTH_TEST);

        let ourShader = shader::shader::new("model", Arc::clone(&gl));

        let ourModel = model::Model::new("resources/models/TestCarModel/CarW4.obj", Arc::clone(&gl));

        (ourShader, ourModel)
    };


    let time = std::time::Instant::now();

    let projection: Matrix4<f32> = perspective(Deg(45.0), SCR_WIDTH as f32/ SCR_HEIGHT as f32, 0.1, 100.0);
    println!("entering main loop");
    // NOTE main loop here
    'running: loop {
        let currentFrame = time.elapsed().as_secs_f32();
            deltaTime = currentFrame - lastFrame;
            lastFrame = currentFrame;


            unsafe{
                gl.enable(glow::DEPTH_TEST);
                gl.clear(glow::COLOR_BUFFER_BIT | glow::DEPTH_BUFFER_BIT);

                ourshader.Use();
                let Projection: Matrix4<f32> = perspective(Deg(camera.Zoom), SCR_WIDTH as f32 / SCR_HEIGHT as f32, 0.1, 100.0);

                let view = camera.GetViewMatrix();
                ourshader.setMat4("projection", &projection);
                ourshader.setMat4("view", &view);


                let mut model: Matrix4<f32> = Matrix4::from_axis_angle(vec3(0.0, -1.0, 0.0).normalize(),
                cgmath::Rad(time.elapsed().as_secs_f32()));
                model = model * Matrix4::from_scale(0.2);
                ourshader.setMat4("model", &model);

            }
        ourModel.Draw(&ourshader);

        window.gl_swap_window();
        for event in events_loop.poll_iter() {


            match event {
                Event::Quit {..} |
                Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
                    break 'running
                },
                _ => {}
            }
        }
    }
}