#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]

extern crate cgmath;
extern crate image;
extern crate nalgebra as na;
extern crate rand;
extern crate sfml;
extern crate time;

use sfml::system::*;
use vulkano::sync;
use crate::timer::Timer;
use vulkano::instance::{Instance};
use vulkano::sync::GpuFuture;
use winit::{EventsLoop, WindowBuilder, WindowEvent, Event, DeviceEvent, VirtualKeyCode, ElementState};
use winit::dpi::LogicalSize;
use vulkano_win::VkSurfaceBuild;
use sprite::Sprite;
use crate::canvas::CanvasFrame;


mod util;
mod slider;
mod timer;
mod input;
mod vkprocessor;
mod button;
mod vertex_2d;
mod vertex_3d;
mod sprite;
mod canvas;


/*

Alright, what the hell do I do next...

Canvas works, but I want to use CPU accessible buffer instead of immutable buffer
    I think it would be faster if we reuse fewer oversized buffers than vis versa

Texturing is broken

Compute is running in the background, but don't have a way to draw it.
    Would like to draw it to a sprite???



8/13 :
Okay. So I've decided to keep compute image and compute kernel in their own 'canvas'
Canvas still needs to be cleaned up. I would like a contract type of thing going on
with the loaded textures. Where you need to request a texture_handle from vkprocessor
to attach to a Sprite. The problem is kinda what I do with the swap image. I only need
a reference to it and the general buffer coming back from the compute kernel. I could
continue to hold the image in the Canvas, and just give out an ID when a Sprite wants it.

The issue here is that kinda muddles the API a bit. I would need to do something like




Canvas.load_textures()

Compute.create_compute(data) -> compute_buffer_id
Canvas.load_image(compute_buffer_id, Compute)

Sprite::with_image(compute_buffer_id)



Canvas::swap_into(compute_buffer, swap_image);



I want to be able to chain computes using the same data
So that would be a different pipeline using the same or similar descriptor set





sprite = Sprite::with_texture(Canvas.get_texture_from_file())

(compute, sprite2) = Compute::with_swap_image(Canvas.get_new_image())



compute load shader -> shader object

compute load buffers -> buffer object

shader object + buffer object + maybe the swap buffer
    -> command queue







let mut canvas = CanvasFrame::new();
canvas.draw(&sprite);
canvas.draw(&sprite2);


(frame_future) = processor.run(&surface, frame_future, canvas);















*/



fn main() {

    let instance = {
        let extensions = vulkano_win::required_extensions();
        Instance::new(None, &extensions, None).unwrap()
    };

    let mut events_loop = EventsLoop::new();
    let mut surface = WindowBuilder::new()
        .with_dimensions(LogicalSize::from((800, 800)))
        .build_vk_surface(&events_loop, instance.clone()).unwrap();
    let mut window = surface.window();

    let mut processor = vkprocessor::VkProcessor::new(&instance, &surface);
    processor.compile_kernel(String::from("simple-edge.compute"));
    processor.load_compute_image(String::from("background.jpg"));
    processor.load_textures(String::from("funky-bird.jpg"));
    processor.create_swapchain(&surface);

    let mut timer = Timer::new();
    let mut frame_future = Box::new(sync::now(processor.device.clone())) as Box<dyn GpuFuture>;

    let step_size: f32 = 0.005;
    let mut elapsed_time: f32;
    let mut delta_time: f32;
    let mut accumulator_time: f32 = 0.0;
    let mut current_time: f32 = timer.elap_time();

    let mut mouse_xy = Vector2i::new(0,0);

    let sprite = Sprite::new_with_color((0.,0.), (0.1,0.1), (1.,0.,0.,1.));
    let sprite2 = Sprite::new_with_color((-1.,-0.5), (0.1,0.1), (0.,1.,0.,1.));

    while let Some(p) = window.get_position() {

        elapsed_time = timer.elap_time();
        delta_time = elapsed_time - current_time;
        current_time = elapsed_time;
        if delta_time > 0.02 {
            delta_time = 0.02;
        }
        accumulator_time += delta_time;

        while (accumulator_time - step_size) >= step_size {
            accumulator_time -= step_size;
        }

        println!("{}", delta_time);

        let mut exit = false;
        events_loop.poll_events(|event| {
            match event {
                Event::WindowEvent { event: WindowEvent::CloseRequested, .. } =>
                    {
                        exit = true;
                    },
                Event::WindowEvent { event: WindowEvent::Resized(_), .. } => {
                    processor.recreate_swapchain(&surface);
                },
                Event::DeviceEvent { event: DeviceEvent::Key(keyboard_input), .. } => {

                    match keyboard_input.virtual_keycode.unwrap() {
                        VirtualKeyCode::A => {
                            if keyboard_input.state == ElementState::Pressed {
                                processor.save_edges_image();
                            }
                        }
                        _ => ()
                    }
                },
//                Event::DeviceEvent { event: DeviceEvent::Button(mouse_input), .. } => {
//                    mouse_xy.x
//                },
                _ => ()
            }
        });

        if exit {
            return;
        }

        /*




        */

        let mut canvas = CanvasFrame::new();
        canvas.draw(&sprite);
        canvas.draw(&sprite2);


        (frame_future) = processor.run(&surface, frame_future, canvas);
    }
}