use std::sync::mpsc::{channel, Receiver, Sender};

use crate::*;

use image::Rgba;
use winit::window::Window;

pub enum RenderPipeline<'a> {
    User(&'a UserRenderPipeline),
    Wgpu(&'a wgpu::RenderPipeline),
}

pub struct UserRenderPipeline {
    pub pipeline: wgpu::RenderPipeline,
    pub layout: wgpu::BindGroupLayout,
    pub bind_group: wgpu::BindGroup,
    pub buffers: HashMap<String, wgpu::Buffer>,
}

pub type PipelineMap = HashMap<String, wgpu::RenderPipeline>;
pub type UserPipelineMap = HashMap<String, UserRenderPipeline>;
pub type TextureMap = HashMap<TextureHandle, BindableTexture>;
pub type RenderTargetMap = HashMap<RenderTargetId, UserRenderTarget>;

#[repr(C)]
#[derive(Copy, Clone, Debug, Default, bytemuck::Pod, bytemuck::Zeroable)]
pub struct QuadUniform {
    pub clip_position: [f32; 2],
    pub size: [f32; 2],
}

pub fn shader_to_wgpu(shader: &Shader) -> wgpu::ShaderModuleDescriptor<'_> {
    wgpu::ShaderModuleDescriptor {
        label: Some(&shader.name),
        source: wgpu::ShaderSource::Wgsl(shader.source.as_str().into()),
    }
}

// TODO: reducing number of Arc's?
#[derive(Clone)]
pub struct GraphicsContext {
    pub surface: Arc<wgpu::Surface>,
    pub instance: Arc<wgpu::Instance>,
    pub adapter: Arc<wgpu::Adapter>,
    pub device: Arc<wgpu::Device>,
    pub queue: Arc<wgpu::Queue>,
    // Shared for all regular textures/sprites
    pub texture_layout: Arc<wgpu::BindGroupLayout>,
    pub config: Arc<AtomicRefCell<wgpu::SurfaceConfiguration>>,
    // TODO: maybe some sharing can be reduced with this
    pub texture_creator: Arc<AtomicRefCell<WgpuTextureCreator>>,
    // TODO: atomic refcell?
    pub textures: Arc<Mutex<TextureMap>>,
}

pub struct WgpuRenderer {
    pub context: GraphicsContext,

    pub pipelines: PipelineMap,
    pub user_pipelines: UserPipelineMap,
    pub shaders: RefCell<ShaderMap>,
    pub render_targets: RefCell<RenderTargetMap>,

    pub text: RefCell<TextRasterizer>,

    pub egui_winit: egui_winit::State,
    pub egui_render_routine: RefCell<EguiRenderRoutine>,

    pub screenshot_buffer: SizedBuffer,

    pub vertex_buffer: SizedBuffer,
    pub index_buffer: SizedBuffer,

    pub quad_ubg: UniformBindGroup,

    pub texture_layout: Arc<wgpu::BindGroupLayout>,

    pub window: Window,

    pub depth_texture: Arc<Texture>,

    pub first_pass_texture: BindableTexture,

    pub lights_buffer: wgpu::Buffer,
    pub global_lighting_params_buffer: wgpu::Buffer,

    pub bloom: Bloom,
    pub post_processing_effects: RefCell<Vec<PostProcessingEffect>>,

    pub render_texture_format: wgpu::TextureFormat,

    pub tonemapping_texture: BindableTexture,

    pub camera_uniform: CameraUniform,
    pub camera_buffer: wgpu::Buffer,
    pub camera_bind_group: Arc<wgpu::BindGroup>,
    pub camera_bind_group_layout: wgpu::BindGroupLayout,

    pub color: Color,

    pub enable_z_buffer: bool,

    // TODO: remove this in favor of the context one
    pub texture_creator: Arc<AtomicRefCell<WgpuTextureCreator>>,

    #[cfg(not(target_arch = "wasm32"))]
    pub thread_pool: rayon::ThreadPool,
    pub loaded_image_recv: Receiver<LoadedImage>,
    pub loaded_image_send: Sender<LoadedImage>,

    pub textures: Arc<Mutex<TextureMap>>,

    pub sprite_shader_id: ShaderId,
    pub error_shader_id: ShaderId,
}

impl WgpuRenderer {
    pub async fn new(window: Window, egui_winit: egui_winit::State) -> Self {
        let context = create_graphics_context(&window).await;

        trace!("Loading builtin engine textures");

        {
            let textures = &mut context.textures.lock();

            macro_rules! load_engine_tex {
                ($name: literal) => {{
                    load_texture_from_engine_bytes(
                        &context,
                        $name,
                        include_bytes!(concat!(
                            env!("CARGO_MANIFEST_DIR"),
                            "/assets/",
                            $name,
                            ".png"
                        )),
                        textures,
                        wgpu::AddressMode::Repeat,
                    );
                }};
            }

            load_engine_tex!("error");
            load_engine_tex!("1px");
            load_engine_tex!("test-grid");
            load_engine_tex!("_builtin-comfy");
        }

        let mut camera_uniform = CameraUniform::new();
        camera_uniform.update_view_proj(&main_camera());

        let camera_buffer = context.device.create_buffer_init(
            &wgpu::util::BufferInitDescriptor {
                label: Some("Camera Buffer"),
                contents: bytemuck::cast_slice(&[camera_uniform]),
                usage: wgpu::BufferUsages::UNIFORM |
                    wgpu::BufferUsages::COPY_DST,
            },
        );

        let camera_bind_group_layout = context.device.create_bind_group_layout(
            &wgpu::BindGroupLayoutDescriptor {
                entries: &[
                    wgpu::BindGroupLayoutEntry {
                        binding: 0,
                        visibility: wgpu::ShaderStages::VERTEX |
                            wgpu::ShaderStages::FRAGMENT,
                        ty: wgpu::BindingType::Buffer {
                            ty: wgpu::BufferBindingType::Uniform,
                            has_dynamic_offset: false,
                            min_binding_size: None,
                        },
                        count: None,
                    },
                    wgpu::BindGroupLayoutEntry {
                        binding: 1,
                        visibility: wgpu::ShaderStages::VERTEX |
                            wgpu::ShaderStages::FRAGMENT,
                        ty: wgpu::BindingType::Buffer {
                            ty: wgpu::BufferBindingType::Uniform,
                            has_dynamic_offset: false,
                            min_binding_size: None,
                        },
                        count: None,
                    },
                    wgpu::BindGroupLayoutEntry {
                        binding: 2,
                        visibility: wgpu::ShaderStages::FRAGMENT,
                        ty: wgpu::BindingType::Buffer {
                            ty: wgpu::BufferBindingType::Uniform,
                            has_dynamic_offset: false,
                            min_binding_size: None,
                        },
                        count: None,
                    },
                    wgpu::BindGroupLayoutEntry {
                        binding: 3,
                        visibility: wgpu::ShaderStages::FRAGMENT,
                        ty: wgpu::BindingType::Texture {
                            sample_type: wgpu::TextureSampleType::Float {
                                filterable: true,
                            },
                            view_dimension: wgpu::TextureViewDimension::D2,
                            multisampled: false,
                        },
                        count: None,
                    },
                    wgpu::BindGroupLayoutEntry {
                        binding: 4,
                        visibility: wgpu::ShaderStages::FRAGMENT,
                        ty: wgpu::BindingType::Sampler(
                            wgpu::SamplerBindingType::Filtering,
                        ),
                        count: None,
                    },
                ],
                label: Some("camera_bind_group_layout"),
            },
        );

        let lights_buffer = context.device.create_buffer_init(
            &wgpu::util::BufferInitDescriptor {
                label: Some("Lights Buffer"),
                contents: bytemuck::cast_slice(&[LightUniform::default()]),
                usage: wgpu::BufferUsages::UNIFORM |
                    wgpu::BufferUsages::COPY_DST,
            },
        );

        let global_lighting_params_buffer = context.device.create_buffer_init(
            &wgpu::util::BufferInitDescriptor {
                label: Some("Global Lighting Params Buffer"),
                contents: bytemuck::cast_slice(&[
                    GlobalLightingParams::default(),
                ]),
                usage: wgpu::BufferUsages::UNIFORM |
                    wgpu::BufferUsages::COPY_DST,
            },
        );

        let lut_dim = 2;

        let color_lut_texture = Texture::create_uninit(
            &context.device,
            lut_dim,
            lut_dim,
            Some("LUT"),
        )
        .unwrap();

        let lut_image =
            image::ImageBuffer::from_fn(lut_dim, lut_dim, |x, y| {
                if x == 0 && y == 0 {
                    Rgba([255, 0, 0, 255]) // Red
                } else if x == 1 && y == 0 {
                    Rgba([0, 255, 0, 255]) // Green
                } else if x == 0 && y == 1 {
                    Rgba([0, 0, 255, 255]) // Blue
                } else {
                    Rgba([255, 255, 255, 255]) // White
                }
            });

        let lut_width = lut_image.width();
        let lut_height = lut_image.height();

        let color_lut_data: Vec<f32> = lut_image
            .pixels()
            .flat_map(|rgba| {
                let r = rgba[0] as f32 / 255.0;
                let g = rgba[1] as f32 / 255.0;
                let b = rgba[2] as f32 / 255.0;
                let a = rgba[3] as f32 / 255.0;
                vec![r, g, b, a]
            })
            .collect();

        context.queue.write_texture(
            wgpu::ImageCopyTexture {
                texture: &color_lut_texture.texture,
                mip_level: 0,
                origin: wgpu::Origin3d::ZERO,
                aspect: wgpu::TextureAspect::All,
            },
            bytemuck::cast_slice(color_lut_data.as_slice()),
            wgpu::ImageDataLayout {
                offset: 0,
                bytes_per_row: Some(
                    lut_width * 4 * std::mem::size_of::<f32>() as u32,
                ),
                rows_per_image: None,
            },
            wgpu::Extent3d {
                width: lut_width,
                height: lut_height,
                depth_or_array_layers: 1,
            },
        );

        let camera_bind_group =
            context.device.create_bind_group(&wgpu::BindGroupDescriptor {
                layout: &camera_bind_group_layout,
                entries: &[
                    wgpu::BindGroupEntry {
                        binding: 0,
                        resource: camera_buffer.as_entire_binding(),
                    },
                    wgpu::BindGroupEntry {
                        binding: 1,
                        resource: lights_buffer.as_entire_binding(),
                    },
                    wgpu::BindGroupEntry {
                        binding: 2,
                        resource: global_lighting_params_buffer
                            .as_entire_binding(),
                    },
                    wgpu::BindGroupEntry {
                        binding: 3,
                        resource: wgpu::BindingResource::TextureView(
                            &color_lut_texture.view,
                        ),
                    },
                    wgpu::BindGroupEntry {
                        binding: 4,
                        resource: wgpu::BindingResource::Sampler(
                            &color_lut_texture.sampler,
                        ),
                    },
                ],
                label: Some("camera_bind_group"),
            });

        let camera_bind_group = Arc::new(camera_bind_group);

        // let global_lighting_params_bind_group =
        //     context.device.create_bind_group(&wgpu::BindGroupDescriptor {
        //         label: Some("Global Lighting Params Bind Group"),
        //         layout: &global_lighting_params_bind_group_layout,
        //         entries: &[
        //         ],
        //     });

        // let global_lighting_params_bind_group =
        //     Arc::new(global_lighting_params_bind_group);

        trace!("Initializing egui");

        let (width, height, format) = {
            let config = context.config.borrow();
            (config.width, config.height, config.format)
        };

        let egui_render_routine = EguiRenderRoutine::new(
            &context.device,
            format,
            1,
            width,
            height,
            window.scale_factor() as f32,
        );

        let screenshot_buffer = SizedBuffer::new(
            "screenshot_buffer",
            &context.device,
            (width * height) as usize * std::mem::size_of::<u32>(),
            BufferType::Read,
        );

        info!("Initializing with scale factor: {}", window.scale_factor());

        BLOOD_CANVAS
            .set(AtomicRefCell::new(BloodCanvas::new(
                context.texture_creator.clone(),
            )))
            .expect("failed to create glow blood canvas");

        let (width, height) = {
            let config = context.config.borrow();
            (config.width, config.height)
        };

        let first_pass_texture = BindableTexture::new(
            &context.device,
            &context.texture_layout,
            &TextureCreationParams {
                label: Some("First Pass Texture"),
                width,
                height,
                ..Default::default()
            },
        );

        let tonemapping_texture = BindableTexture::new(
            &context.device,
            &context.texture_layout,
            &TextureCreationParams {
                label: Some("Tonemapping"),
                width,
                height,
                ..Default::default()
            },
        );

        let quad = QuadUniform { clip_position: [0.0, 0.0], size: [0.2, 0.2] };

        let quad_ubg = UniformBindGroup::simple(
            "Debug Quad",
            &context.device,
            bytemuck::cast_slice(&[quad]),
        );

        let render_texture_format = wgpu::TextureFormat::Rgba16Float;

        let mut shaders = ShaderMap::new();

        let bloom = Bloom::new(
            &context,
            &mut shaders,
            render_texture_format,
            camera_bind_group.clone(),
            &camera_bind_group_layout,
        );

        let vertex_buffer = SizedBuffer::new(
            "Mesh Vertex Buffer",
            &context.device,
            1024 * 1024,
            BufferType::Vertex,
        );

        let index_buffer = SizedBuffer::new(
            "Mesh Index Buffer",
            &context.device,
            1024 * 1024,
            BufferType::Index,
        );


        let (tx_texture, rx_texture) = channel::<LoadedImage>();

        // TODO: resize

        let depth_texture = Texture::create_depth_texture(
            &context.device,
            &context.config.borrow(),
            "Depth Texture",
        );

        let sprite_shader_id = create_shader(
            &mut shaders,
            "sprite",
            &sprite_shader_from_fragment(engine_shader_source!("sprite")),
            HashMap::new(),
        )
        .unwrap();

        let error_shader_id = create_shader(
            &mut shaders,
            "error",
            &sprite_shader_from_fragment(engine_shader_source!("error")),
            HashMap::new(),
        )
        .unwrap();

        let renderer = Self {
            #[cfg(not(target_arch = "wasm32"))]
            thread_pool: rayon::ThreadPoolBuilder::new().build().unwrap(),

            text: RefCell::new(TextRasterizer::new(context.clone())),

            sprite_shader_id,
            error_shader_id,

            loaded_image_recv: rx_texture,
            loaded_image_send: tx_texture,

            depth_texture: Arc::new(depth_texture),

            pipelines: HashMap::new(),
            user_pipelines: HashMap::new(),

            shaders: RefCell::new(shaders),
            render_targets: RefCell::new(HashMap::new()),

            screenshot_buffer,

            vertex_buffer,
            index_buffer,

            post_processing_effects: RefCell::new(Vec::new()),
            bloom,

            egui_winit,
            egui_render_routine: RefCell::new(egui_render_routine),

            first_pass_texture,

            lights_buffer,

            quad_ubg,

            global_lighting_params_buffer,

            texture_layout: context.texture_layout.clone(),

            tonemapping_texture,

            camera_uniform,
            camera_buffer,
            camera_bind_group,
            camera_bind_group_layout,

            textures: context.textures.clone(),
            render_texture_format,

            color: Color::new(0.1, 0.2, 0.3, 1.0),

            enable_z_buffer: false,

            texture_creator: context.texture_creator.clone(),

            window,

            context,
        };

        {
            let copy_shader_id = create_shader(
                &mut renderer.shaders.borrow_mut(),
                "copy",
                &post_process_shader_from_fragment(COPY_SHADER_SRC),
                HashMap::new(),
            )
            .expect("copy shader creation failed");

            insert_post_processing_effect(&renderer, 0, "copy", copy_shader_id);
        }

        renderer
    }

    pub fn window(&self) -> &Window {
        &self.window
    }

    pub fn render_post_processing(
        &mut self,
        screen_view: &wgpu::TextureView,
        game_config: &GameConfig,
    ) {
        let _span = span!("render_post_processing");
        let mut encoder =
            self.context.device.simple_encoder("Post Processing Encoder");

        let mut input_bind_group = &self.first_pass_texture.bind_group;

        if game_config.bloom_enabled {
            self.bloom.draw(
                &self.context.device,
                &self.texture_layout,
                input_bind_group,
                &mut encoder,
            );
        }

        let post_processing_effects = self.post_processing_effects.borrow();
        let surface_texture_format = self.context.config.borrow().format;

        let (last_effect_view, last_effect_format) = if game_config
            .tonemapping_enabled
        {
            (&self.tonemapping_texture.texture.view, self.render_texture_format)
        } else {
            (screen_view, surface_texture_format)
        };

        let enabled_effects =
            post_processing_effects.iter().filter(|x| x.enabled).collect_vec();

        for (i, effect) in enabled_effects.iter().enumerate() {
            let (output_texture_view, output_texture_format) =
                if i == enabled_effects.len() - 1 {
                    (last_effect_view, last_effect_format)
                } else {
                    (&effect.render_texture.view, self.render_texture_format)
                };

            let pipeline_key =
                format!("{}-{:?}", effect.name, output_texture_format);

            let maybe_pipeline = if self.pipelines.contains_key(&pipeline_key) {
                Some(self.pipelines.get(&pipeline_key).unwrap())
            } else {
                info!("Loading EFFECT: {}", effect.name);

                if let Some(shader) = self.shaders.borrow().get(effect.id) {
                    let pipeline = create_post_processing_pipeline(
                        &effect.name,
                        &self.context.device,
                        output_texture_format,
                        &[&self.texture_layout, &self.camera_bind_group_layout],
                        shader.clone(),
                        // &effect.shader,
                        wgpu::BlendState::REPLACE,
                    );

                    self.pipelines.insert(pipeline_key.clone(), pipeline);
                    self.pipelines.get(&pipeline_key)
                } else {
                    warn!(
                        "NO SHADER FOR EFFECT: {} ... {}",
                        effect.name, effect.id
                    );
                    None
                }
            };

            if let Some(pipeline) = maybe_pipeline {
                draw_post_processing_output(
                    &effect.name,
                    &mut encoder,
                    pipeline,
                    input_bind_group,
                    &self.camera_bind_group,
                    // &effect.bind_group,
                    output_texture_view,
                    true,
                    None,
                );

                input_bind_group = &effect.bind_group;
            } else {
                error!("Missing pipeline for {}", effect.name);
            }
        }

        if game_config.bloom_enabled {
            self.bloom.blit_final(
                &mut encoder,
                &mut self.shaders.borrow_mut(),
                &mut self.pipelines,
                last_effect_view,
                last_effect_format,
                &game_config.lighting,
            );
        }

        if game_config.tonemapping_enabled {
            let tonemapping_pipeline = self
                .pipelines
                .entry("tonemapping".into())
                .or_insert_with(|| {
                    // TODO: texture format?
                    let shaders = &mut self.shaders.borrow_mut();

                    create_post_processing_pipeline(
                        "Tonemapping",
                        &self.context.device,
                        self.context.config.borrow().format,
                        &[&self.texture_layout, &self.camera_bind_group_layout],
                        create_engine_post_processing_shader!(
                            shaders,
                            "tonemapping"
                        ),
                        wgpu::BlendState::REPLACE,
                    )
                });


            {
                let should_clear = false;

                let mut render_pass =
                    encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
                        label: Some("Tonemapping"),
                        color_attachments: &[Some(
                            wgpu::RenderPassColorAttachment {
                                view: screen_view,
                                resolve_target: None,
                                ops: wgpu::Operations {
                                    load: if should_clear {
                                        wgpu::LoadOp::Clear(wgpu::Color {
                                            r: 0.0,
                                            g: 0.0,
                                            b: 0.0,
                                            a: 1.0,
                                        })
                                    } else {
                                        wgpu::LoadOp::Load
                                    },
                                    store: wgpu::StoreOp::Store,
                                },
                            },
                        )],
                        depth_stencil_attachment: None,
                        timestamp_writes: None,
                        occlusion_query_set: None,
                    });

                render_pass.set_pipeline(tonemapping_pipeline);
                render_pass.set_bind_group(
                    0,
                    &self.tonemapping_texture.bind_group,
                    &[],
                );
                render_pass.set_bind_group(1, &self.camera_bind_group, &[]);

                render_pass.draw(0..3, 0..1);
            }
        }

        self.context.queue.submit(std::iter::once(encoder.finish()));
    }

    pub fn render_egui(&self, view: &wgpu::TextureView, params: &DrawParams) {
        let _span = span!("render_egui");

        let mut encoder =
            self.context.device.simple_encoder("egui Render Encoder");

        let paint_jobs =
            self.egui_render_routine.borrow_mut().end_frame_and_render(
                params.egui,
                &self.context.device,
                &self.context.queue,
                &mut encoder,
                egui_scale_factor(),
            );

        let egui_render = self.egui_render_routine.borrow();
        let egui_render = &egui_render;

        {
            let mut render_pass =
                encoder.simple_render_pass("egui Render Pass", None, view);
            egui_render.render_pass.render(
                &mut render_pass,
                &paint_jobs,
                &egui_render.screen_descriptor,
            );
        }

        self.context.queue.submit(std::iter::once(encoder.finish()));
    }

    pub fn on_event(
        &mut self,
        event: &winit::event::WindowEvent,
        egui_ctx: &egui::Context,
    ) -> bool {
        self.egui_winit.on_window_event(egui_ctx, event).consumed
    }

    pub fn as_mut_any(&mut self) -> &mut dyn Any {
        self
    }

    pub fn update(&mut self, params: &mut DrawParams) {
        let _span = span!("renderer update");

        let mut changed_recording_mode = false;

        if is_key_pressed(KeyCode::F3) {
            params.config.dev.recording_mode =
                match params.config.dev.recording_mode {
                    RecordingMode::None => RecordingMode::Landscape,
                    RecordingMode::Tiktok => RecordingMode::Landscape,
                    RecordingMode::Landscape => RecordingMode::None,
                };

            changed_recording_mode = true;
        }

        if is_key_pressed(KeyCode::F9) {
            self.enable_z_buffer = !self.enable_z_buffer;
            info!("Z Buffer: {}", self.enable_z_buffer);
        }

        if is_key_pressed(KeyCode::F4) {
            params.config.dev.recording_mode =
                match params.config.dev.recording_mode {
                    RecordingMode::None => RecordingMode::Tiktok,
                    RecordingMode::Tiktok => RecordingMode::None,
                    RecordingMode::Landscape => RecordingMode::Tiktok,
                };

            changed_recording_mode = true;
        }

        // Load textures
        {
            let _span = span!("wgpu texture load");

            while let Ok(loaded_image) = self.loaded_image_recv.try_recv() {
                let context = self.context.clone();
                let textures = self.textures.clone();
                let layout = self.texture_layout.clone();

                let load_image_texture = move || {
                    let texture = Texture::from_image(
                        &context.device,
                        &context.queue,
                        &loaded_image.image,
                        Some(&loaded_image.path),
                        false,
                    )
                    .unwrap();

                    let bind_group = context.device.simple_bind_group(
                        Some(&format!("{}_bind_group", loaded_image.path)),
                        &texture,
                        &layout,
                    );

                    textures.lock().insert(
                        loaded_image.handle,
                        BindableTexture { bind_group, texture },
                    );
                };

                #[cfg(target_arch = "wasm32")]
                load_image_texture();

                #[cfg(not(target_arch = "wasm32"))]
                self.thread_pool.spawn(load_image_texture);
            }
        }

        if changed_recording_mode {
            info!("Recording Mode: {:?}", params.config.dev.recording_mode);

            self.window.set_title(&format!(
                "{} {}(COMFY ENGINE)",
                params.config.game_name,
                if params.config.dev.recording_mode == RecordingMode::Tiktok {
                    "Portrait "
                } else {
                    ""
                },
            ));

            let ratio = 1920.0 / 1080.0;

            let size = 600.0;
            let portrait_res = winit::dpi::PhysicalSize::new(
                size as i32,
                (size * ratio) as i32,
            );

            let landscape_res = winit::dpi::PhysicalSize::new(1920, 1080);

            let (resolution, _ui_toggle) =
                match params.config.dev.recording_mode {
                    RecordingMode::None => (landscape_res, true),
                    RecordingMode::Tiktok => (portrait_res, false),
                    RecordingMode::Landscape => (landscape_res, false),
                };

            self.window.set_inner_size(resolution);
            // self.window.center();
        }

        #[cfg(not(any(feature = "ci-release", target_arch = "wasm32")))]
        maybe_reload_shaders(&mut self.shaders.borrow_mut());

        self.camera_uniform.update_view_proj(&main_camera());

        params.config.lighting.time = get_time() as f32;

        {
            let camera = main_camera();
            params.config.lighting.chromatic_aberration =
                (camera.shake_amount * 200.0 * camera.shake_timer)
                    .clamp(0.0, 200.0);
        }

        self.context.queue.write_buffer(
            &self.global_lighting_params_buffer,
            0,
            bytemuck::cast_slice(&[params.config.lighting]),
        );

        self.context.queue.write_buffer(
            &self.camera_buffer,
            0,
            bytemuck::cast_slice(&[self.camera_uniform]),
        );

        let mut light_uniform = LightUniform::default();

        for (i, light) in params.lights.iter().enumerate() {
            if i >= 128 {
                break;
            }

            light_uniform.lights[i] = *light;
            light_uniform.num_lights += 1;
        }

        self.context.queue.write_buffer(
            &self.lights_buffer,
            0,
            bytemuck::cast_slice(&[light_uniform]),
        );
    }

    pub fn draw(&mut self, params: DrawParams) {
        span_with_timing!("render");

        let output = {
            let _span = span!("get current surface");

            match self.context.surface.get_current_texture() {
                Ok(texture) => texture,
                Err(_) => {
                    return;
                }
            }
        };

        let surface_view = {
            let _span = span!("create surface view");
            output.texture.create_view(&wgpu::TextureViewDescriptor::default())
        };

        run_batched_render_passes(
            self,
            &surface_view,
            &params,
            self.sprite_shader_id,
            self.error_shader_id,
        );

        self.render_post_processing(&surface_view, params.config);
        self.render_egui(&surface_view, &params);

        if params.config.dev.show_buffers {
            let pp = self.post_processing_effects.borrow();

            let mut bind_groups = vec![&self.first_pass_texture.bind_group];
            bind_groups.push(&self.bloom.threshold.bind_group);
            bind_groups.push(&self.bloom.blur_texture.bind_group);

            for effect in pp.iter() {
                if effect.enabled {
                    bind_groups.push(&effect.bind_group);
                }
            }

            render_debug(
                &self.context,
                &mut self.shaders.borrow_mut(),
                self.enable_z_buffer,
                &self.quad_ubg,
                &self.texture_layout,
                &self.depth_texture,
                bind_groups,
                &mut self.pipelines,
                &surface_view,
            );
        }

        #[cfg(feature = "record-pngs")]
        {
            let config = self.context.config.borrow();

            screenshot::record_pngs(
                uvec2(config.width, config.height),
                &self.context,
                &self.screenshot_buffer,
                &output,
            );
        }

        output.present();
    }

    pub fn scale_factor(&self) -> f32 {
        // self.window.scale_factor() as f32
        1.0
    }

    pub fn resize(&mut self, new_size: UVec2) {
        let _span = span!("resize");

        let scale_factor = self.window.scale_factor() as f32;

        let size = winit::dpi::PhysicalSize::<u32>::new(new_size.x, new_size.y);

        {
            let mut config = self.context.config.borrow_mut();

            config.width = size.width;
            config.height = size.height;

            self.context.surface.configure(&self.context.device, &config);
        }

        self.egui_render_routine.borrow_mut().resize(
            size.width,
            size.height,
            scale_factor,
        );

        // self.egui_winit.set_pixels_per_point(scale_factor);
    }

    pub fn width(&self) -> f32 {
        self.context.config.borrow().width as f32
    }

    pub fn height(&self) -> f32 {
        self.context.config.borrow().height as f32
    }

    pub fn end_frame(&mut self) {}
}

pub fn depth_stencil_attachment(
    enabled: bool,
    view: &wgpu::TextureView,
    is_first: bool,
) -> Option<wgpu::RenderPassDepthStencilAttachment> {
    let clear_depth =
        if is_first { wgpu::LoadOp::Clear(1.0) } else { wgpu::LoadOp::Load };

    if enabled {
        Some(wgpu::RenderPassDepthStencilAttachment {
            view,
            depth_ops: Some(wgpu::Operations {
                load: clear_depth,
                store: wgpu::StoreOp::Store,
            }),
            stencil_ops: None,
        })
    } else {
        None
    }
}