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use math::Vector2;

use crate::{
	eventpub::EventSub,
	platform::{PlatformEvent, Window, WindowHandle},
	*,
};

use std::sync::Mutex;

/// A standard Renderer WGPU device used with `riddle_platform_winit` windows.
///
/// While this can be used directly, if using [`Renderer::new_from_window`], this
/// type shouldn't need to be used by consumer code.
pub struct WindowWGPUDevice {
	window: WindowHandle,
	window_event_sub: EventSub<PlatformEvent>,

	device: wgpu::Device,
	surface: wgpu::Surface,
	queue: wgpu::Queue,

	swap_chain: Mutex<wgpu::SwapChain>,
	current_frame: Mutex<Option<wgpu::SwapChainFrame>>,
}

impl WindowWGPUDevice {
	pub fn new(window: &Window) -> Result<Self> {
		let instance = wgpu::Instance::new(wgpu::BackendBit::PRIMARY);
		let surface = unsafe { instance.create_surface(window) };

		log::debug!("Initializing WGPU adapter...");
		let adapter =
			futures::executor::block_on(instance.request_adapter(&wgpu::RequestAdapterOptions {
				power_preference: wgpu::PowerPreference::HighPerformance,
				compatible_surface: Some(&surface),
			}))
			.ok_or(WGPURendererError::APIInitError(
				"Failed to get WGPU adapter",
			))?;

		log::debug!("Initializing WGPU device...");
		let (device, queue) = futures::executor::block_on(adapter.request_device(
			&wgpu::DeviceDescriptor {
				..Default::default()
			},
			None,
		))
		.map_err(|_| WGPURendererError::APIInitError("Failed to create WGPU device"))?;

		let (width, height) = window.physical_size();
		let sc_desc = wgpu::SwapChainDescriptor {
			usage: wgpu::TextureUsage::RENDER_ATTACHMENT,
			format: wgpu::TextureFormat::Bgra8UnormSrgb,
			width,
			height,
			present_mode: wgpu::PresentMode::Mailbox,
		};

		let swap_chain = device.create_swap_chain(&surface, &sc_desc);

		let window_event_sub = EventSub::new();
		window.subscribe_to_events(&window_event_sub);

		Ok(Self {
			window: window.clone_handle(),
			window_event_sub,
			device,
			surface,
			queue,
			swap_chain: Mutex::new(swap_chain),
			current_frame: Mutex::new(None),
		})
	}

	fn handle_window_events(&self) {
		let mut dirty_swap_chain = false;
		for event in self.window_event_sub.collect().iter() {
			if let PlatformEvent::WindowResize(_) = event {
				dirty_swap_chain = true;
			}
		}

		if dirty_swap_chain {
			let (width, height) = self.window.physical_size();
			let sc_desc = wgpu::SwapChainDescriptor {
				usage: wgpu::TextureUsage::RENDER_ATTACHMENT,
				format: wgpu::TextureFormat::Bgra8UnormSrgb,
				width,
				height,
				present_mode: wgpu::PresentMode::Mailbox,
			};

			let swap_chain = self.device.create_swap_chain(&self.surface, &sc_desc);
			*self.swap_chain.lock().unwrap() = swap_chain;
		}
	}

	fn ensure_current_frame(&self) -> Result<()> {
		let swap_chain = self.swap_chain.lock().unwrap();
		let mut frame = self.current_frame.lock().unwrap();

		let new_frame = swap_chain
			.get_current_frame()
			.map_err(|_| WGPURendererError::BeginRenderError("Error getting swap chain frame"))?;

		*frame = Some(new_frame);

		Ok(())
	}

	fn present_current_frame(&self) {
		let mut frame = self.current_frame.lock().unwrap();
		*frame = None;
	}
}

impl WGPUDevice for WindowWGPUDevice {
	fn viewport_dimensions(&self) -> Vector2<f32> {
		self.window.logical_size().into()
	}

	fn begin_frame(&self) -> Result<()> {
		self.handle_window_events();
		self.ensure_current_frame()
	}

	fn end_frame(&self) {
		self.present_current_frame()
	}

	#[inline]
	fn with_device_info<R, F>(&self, f: F) -> Result<R>
	where
		F: FnOnce(&WGPUDeviceInfo) -> Result<R>,
	{
		let info = WGPUDeviceInfo {
			device: &self.device,
			queue: &self.queue,
		};
		f(&info)
	}

	#[inline]
	fn with_frame<R, F>(&self, f: F) -> Result<R>
	where
		F: FnOnce(&wgpu::SwapChainFrame) -> Result<R>,
	{
		let frame = self.current_frame.lock().unwrap();
		f(frame.as_ref().unwrap())
	}
}