use vulkano::command_buffer::DynamicState;
use crate::vulkan::GameData;
use crate::vulkan::{LinePoint, Vertex};
use crate::GameObject;
use vulkano::{command_buffer::AutoCommandBufferBuilder, descriptor::descriptor_set::PersistentDescriptorSet};
use crate::VulkanRenderer;
use vulkano::pipeline::{GraphicsPipeline};
use vulkano::framebuffer::Subpass;
use vulkano::pipeline::GraphicsPipelineAbstract;
use vulkano::framebuffer::RenderPassAbstract;
use std::sync::Arc;
use vulkano::device::Device;

type RP = Arc<dyn RenderPassAbstract + Send + Sync>;
type GP = Arc<dyn GraphicsPipelineAbstract + Send + Sync>;

pub trait Drawcall {
    fn draw(self: &Self, builder: &mut AutoCommandBufferBuilder, fb_index: usize, game_data: &GameData, dynamic_state: &DynamicState);
    fn create_descriptor_set(self: &Self, game_object: &mut GameObject, renderer: &VulkanRenderer);
    fn recreate_pipeline(self: &mut Self, device: Arc<Device>, render_pass: RP);
    fn get_pipeline(self: &Self) -> &GP;
}

pub mod vs {
    vulkano_shaders::shader!{
        ty: "vertex",
        path: "shaders/triangle.vert"
    }
}

pub mod fs {
    vulkano_shaders::shader! {
        ty: "fragment",
        path: "shaders/triangle.frag"
    }
}

#[derive(Clone)]
pub struct DefaultShader {
    pipeline: GP,
}

impl DefaultShader {
    pub fn new(device: Arc<Device>, render_pass: RP) -> Self {
        DefaultShader {
            pipeline: Self::create_pipeline(device, render_pass)
        }
    }

    fn create_pipeline(device: Arc<Device>, render_pass: RP) -> GP {
        let sub_pass = Subpass::from(render_pass.clone(), 0).unwrap();
        let vertex_shader = vs::Shader::load(device.clone()).unwrap();
        let fragment_shader = fs::Shader::load(device.clone()).unwrap();
    
        Arc::new(GraphicsPipeline::start()
            .vertex_input_single_buffer::<Vertex>()
            .vertex_shader(vertex_shader.main_entry_point(), ())
            .triangle_list()
            .viewports_dynamic_scissors_irrelevant(1)
            .depth_stencil_simple_depth()
            .fragment_shader(fragment_shader.main_entry_point(), ())
            .blend_alpha_blending()
            .cull_mode_back()
            .render_pass(sub_pass.clone())
            .build(device.clone())
            .unwrap())
    }
}

impl Drawcall for DefaultShader {
    fn recreate_pipeline(self: &mut Self, device: Arc<Device>, render_pass: RP) {
        self.pipeline = Self::create_pipeline(device, render_pass);
    }

    fn create_descriptor_set(self: &Self, game_object: &mut GameObject, renderer: &VulkanRenderer) {
        let descriptor_set_layout = self.get_pipeline().descriptor_set_layout(0).unwrap().clone();

        println!("Diff: {:?}, Norm: {:?}", game_object.texture_index, game_object.normal_map_index);

        game_object.descriptor_sets = renderer.uniform_buffers.iter().map(|uniform_buffer| {
            let descriptor_set: Arc<(dyn vulkano::descriptor::DescriptorSet + std::marker::Send + std::marker::Sync + 'static)>;
            let builder = PersistentDescriptorSet::start(descriptor_set_layout.clone());

            descriptor_set = Arc::new(builder
                .add_buffer(uniform_buffer.clone()).unwrap()
                .add_sampled_image(renderer.game_data.textures[game_object.texture_index].clone(), renderer.sampler.clone()).unwrap()
                .add_sampled_image(renderer.game_data.textures[game_object.normal_map_index].clone(), renderer.sampler.clone()).unwrap()
                .build().unwrap());

            descriptor_set
        }).collect();
    }

    fn draw(self: &Self, builder: &mut AutoCommandBufferBuilder, fb_index: usize, game_data: &GameData, dynamic_state: &DynamicState) {
        for i in 0..game_data.game_objects.len() {
            let game_object = &game_data.game_objects[i];
            let mesh = &game_data.meshes[game_object.mesh_index];
            let mut push_constants = game_data.push_constants.clone();
            push_constants.model = game_object.get_model_matrix().into();

            builder.draw_indexed(
                self.pipeline.clone(),
                dynamic_state,
                vec![mesh.vertex_buffer.clone()],
                mesh.index_buffer.clone(),
                game_object.descriptor_sets[fb_index].clone(),
                push_constants).unwrap();
        }
    }

    fn get_pipeline(self: &Self) -> &GP {
        &self.pipeline
    }
}

pub mod line_vs {
    vulkano_shaders::shader!{
        ty: "vertex",
        path: "shaders/line.vert"
    }
}

pub mod line_fs {
    vulkano_shaders::shader! {
        ty: "fragment",
        path: "shaders/line.frag"
    }
}

#[derive(Clone)]
pub struct LineShader {
    pipeline: GP,
    vertex_buffer: Arc<vulkano::buffer::CpuAccessibleBuffer<[LinePoint]>>
}

impl LineShader {
    pub fn new(device: Arc<Device>, render_pass: RP, vertex_buffer: Arc<vulkano::buffer::CpuAccessibleBuffer<[LinePoint]>>) -> Self {
        LineShader {
            pipeline: Self::create_pipeline(device, render_pass),
            vertex_buffer
        }
    }

    fn create_pipeline(device: Arc<Device>, render_pass: RP) -> GP {
        let sub_pass = Subpass::from(render_pass.clone(), 0).unwrap();
        let vertex_shader = line_vs::Shader::load(device.clone()).unwrap();
        let fragment_shader = line_fs::Shader::load(device.clone()).unwrap();

        Arc::new(GraphicsPipeline::start()
            .vertex_input_single_buffer::<LinePoint>()
            .vertex_shader(vertex_shader.main_entry_point(), ())
            .line_list()
            .viewports_dynamic_scissors_irrelevant(1)
            .depth_stencil_simple_depth()
            .fragment_shader(fragment_shader.main_entry_point(), ())
            .render_pass(sub_pass.clone())
            .build(device.clone())
            .unwrap())
    }
}

impl Drawcall for LineShader {
    fn draw(self: &Self, builder: &mut AutoCommandBufferBuilder, _fb_index: usize, game_data: &GameData, dynamic_state: &DynamicState) {
        builder.draw(self.pipeline.clone(),
            &dynamic_state,
            vec![self.vertex_buffer.clone()],
            (),
            game_data.line_push_constants.clone()).unwrap();
    }

    fn create_descriptor_set(self: &Self, _game_object: &mut GameObject, _renderer: &VulkanRenderer) {
        
    }

    fn recreate_pipeline(self: &mut Self, device: Arc<Device>, render_pass: RP) {
        self.pipeline = Self::create_pipeline(device, render_pass);
    }

    fn get_pipeline(self: &Self) -> &GP {
        &self.pipeline
    }
}