#pragma once
#include <vulkan/vulkan.h>
#include "Graphics/GraphicsResources.h"
#include <functional>

namespace Seele
{
namespace Vulkan
{

DECLARE_REF(DescriptorAllocator);
DECLARE_REF(CommandBufferManager);
DECLARE_REF(CmdBuffer);
DECLARE_REF(Graphics);
DECLARE_REF(SubAllocation);
class Semaphore
{
public:
	Semaphore(PGraphics graphics);
	virtual ~Semaphore();
	inline VkSemaphore getHandle() const
	{
		return handle;
	}

private:
	VkSemaphore handle;
	PGraphics graphics;
};
DEFINE_REF(Semaphore);

class Fence
{
public:
	Fence(PGraphics graphics);
	~Fence();
	bool isSignaled();
	void reset();
	inline VkFence getHandle() const
	{
		return fence;
	}
	void wait(uint32 timeout);
	bool operator<(const Fence &other) const
	{
		return fence < other.fence;
	}

private:
	bool signaled;
	VkFence fence;
	PGraphics graphics;
};
DEFINE_REF(Fence);

class VertexDeclaration : public Gfx::VertexDeclaration
{
public:
	Array<Gfx::VertexElement> elementList;

	VertexDeclaration(const Array<Gfx::VertexElement>& elementList);
	virtual ~VertexDeclaration();
private:
};
DEFINE_REF(VertexDeclaration);

class QueueOwnedResourceDeletion
{
public:
	QueueOwnedResourceDeletion();
	virtual ~QueueOwnedResourceDeletion();
	static void addPendingDelete(PCmdBuffer fence, std::function<void()> function);

private:
	std::thread worker;
	static volatile bool running;
	static void run();
	struct PendingItem
	{
		PCmdBuffer cmdBuffer;
		std::function<void()> func;
	};
	static std::mutex mutex;
	static std::condition_variable cv;
	static List<PendingItem> deletionQueue;
};

class ShaderBuffer
{
public:
	ShaderBuffer(PGraphics graphics, uint32 size, VkBufferUsageFlags usage, Gfx::QueueType queueType);
	virtual ~ShaderBuffer();
	VkBuffer getHandle() const
	{
		return buffers[currentBuffer].buffer;
	}
	uint32 getSize() const
	{
		return size;
	}
	VkDeviceSize getOffset() const;
	void advanceBuffer()
	{
		currentBuffer = (currentBuffer + 1) % numBuffers;
	}
	void *lock(bool bWriteOnly = true);
	void unlock();

protected:
	struct BufferAllocation
	{
		VkBuffer buffer;
		PSubAllocation allocation;
	};
	BufferAllocation buffers[Gfx::numFramesBuffered];
	uint32 numBuffers;
	uint32 currentBuffer;
	uint32 size;
	PGraphics graphics;
	Gfx::QueueType currentOwner;

	void executeOwnershipBarrier(Gfx::QueueType newOwner);
	virtual void requestOwnershipTransfer(Gfx::QueueType newOwner) = 0;

	virtual VkAccessFlags getSourceAccessMask() = 0;
	virtual VkAccessFlags getDestAccessMask() = 0;
};
DEFINE_REF(ShaderBuffer);

class UniformBuffer : public Gfx::UniformBuffer, public ShaderBuffer
{
public:
	UniformBuffer(PGraphics graphics, const BulkResourceData &resourceData);
	virtual ~UniformBuffer();
	virtual void updateContents(const BulkResourceData &resourceData);
protected:
	// Inherited via Vulkan::Buffer
	virtual void requestOwnershipTransfer(Gfx::QueueType newOwner);
	virtual VkAccessFlags getSourceAccessMask();
	virtual VkAccessFlags getDestAccessMask();
	// Inherited via QueueOwnedResource
	virtual void executeOwnershipBarrier(Gfx::QueueType newOwner);
};
DEFINE_REF(UniformBuffer);

class StructuredBuffer : public Gfx::StructuredBuffer, public ShaderBuffer
{
public:
	StructuredBuffer(PGraphics graphics, const BulkResourceData &resourceData);
	virtual ~StructuredBuffer();

protected:
	// Inherited via Vulkan::Buffer
	virtual VkAccessFlags getSourceAccessMask();
	virtual VkAccessFlags getDestAccessMask();
	virtual void requestOwnershipTransfer(Gfx::QueueType newOwner);
	// Inherited via QueueOwnedResource
	virtual void executeOwnershipBarrier(Gfx::QueueType newOwner);
};
DEFINE_REF(StructuredBuffer);

class VertexBuffer : public Gfx::VertexBuffer, public ShaderBuffer
{
public:
	VertexBuffer(PGraphics graphics, const VertexBufferCreateInfo &resourceData);
	virtual ~VertexBuffer();

protected:
	// Inherited via Vulkan::Buffer
	virtual VkAccessFlags getSourceAccessMask();
	virtual VkAccessFlags getDestAccessMask();
	virtual void requestOwnershipTransfer(Gfx::QueueType newOwner);
	// Inherited via QueueOwnedResource
	virtual void executeOwnershipBarrier(Gfx::QueueType newOwner);
};
DEFINE_REF(VertexBuffer);

class IndexBuffer : public Gfx::IndexBuffer, public ShaderBuffer
{
public:
	IndexBuffer(PGraphics graphics, const IndexBufferCreateInfo &resourceData);
	virtual ~IndexBuffer();

protected:
	// Inherited via Vulkan::Buffer
	virtual void requestOwnershipTransfer(Gfx::QueueType newOwner);
	virtual VkAccessFlags getSourceAccessMask();
	virtual VkAccessFlags getDestAccessMask();
	// Inherited via QueueOwnedResource
	virtual void executeOwnershipBarrier(Gfx::QueueType newOwner);
};
DEFINE_REF(IndexBuffer);

class TextureHandle
{
public:
	TextureHandle(PGraphics graphics, VkImageViewType viewType, 
		const TextureCreateInfo& createInfo, VkImage existingImage = VK_NULL_HANDLE);
	virtual ~TextureHandle();

	inline VkImageView getView() const
	{
		return defaultView;
	}
	inline VkImageLayout getLayout() const
	{
		return layout;
	}
	inline VkImageAspectFlags getAspect() const
	{
		return aspect;
	}
	inline VkImageUsageFlags getUsage() const
	{
		return usage;
	}
	inline Gfx::SeFormat getFormat() const
	{
		return format;
	}
	inline Gfx::SeSampleCountFlags getNumSamples() const
	{
		return samples;
	}
	inline bool isDepthStencil() const
	{
		return aspect & (VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT);
	}
	void executeOwnershipBarrier(Gfx::QueueType newOwner);
	void changeLayout(VkImageLayout newLayout);

	Gfx::QueueType currentOwner;
private:
	PGraphics graphics;
	PSubAllocation allocation;
	uint32 sizeX;
	uint32 sizeY;
	uint32 sizeZ;
	uint32 arrayCount;
	uint32 mipLevels;
	uint32 samples;
	Gfx::SeFormat format;
	Gfx::SeImageUsageFlags usage;
	VkImage image;
	VkImageView defaultView;
	VkImageAspectFlags aspect;
	VkImageLayout layout;
	friend class TextureBase;
	friend class Texture2D;
};

class TextureBase
{
public:
	static TextureHandle* cast(Gfx::PTexture texture);
	void changeLayout(VkImageLayout newLayout);

protected:
	TextureHandle* textureHandle;
};

class Texture2D : public Gfx::Texture2D, public TextureBase
{
public:
	Texture2D(PGraphics graphics, const TextureCreateInfo& createInfo, VkImage existingImage = VK_NULL_HANDLE);
	virtual ~Texture2D();
	virtual uint32 getSizeX() const override
	{
		return textureHandle->sizeX;
	}
	virtual uint32 getSizeY() const override
	{
		return textureHandle->sizeY;
	}
	virtual Gfx::SeFormat getFormat() const override
	{
		return textureHandle->format;
	}
	virtual Gfx::SeSampleCountFlags getNumSamples() const override
	{
		return textureHandle->getNumSamples();
	}
	inline VkImage getHandle() const
	{
		return textureHandle->image;
	}
	inline VkImageView getView() const
	{
		return textureHandle->defaultView;
	}
	inline bool isDepthStencil() const
	{
		return textureHandle->isDepthStencil();
	}
protected:
	// Inherited via QueueOwnedResource
	virtual void executeOwnershipBarrier(Gfx::QueueType newOwner);

};
DEFINE_REF(Texture2D);

class SamplerState : public Gfx::SamplerState
{
public:
	VkSampler sampler;
};
DEFINE_REF(SamplerState);

class Window : public Gfx::Window
{
public:
	Window(PGraphics graphics, const WindowCreateInfo &createInfo);
	virtual ~Window();
	virtual void beginFrame() override;
	virtual void endFrame() override;
	virtual Gfx::PTexture2D getBackBuffer() override;
	virtual void onWindowCloseEvent() override;
	virtual void setKeyCallback(std::function<void(KeyCode, KeyAction, KeyModifier)> callback) override;

	std::function<void(KeyCode, KeyAction, KeyModifier)> keyCallback;
protected:
	void advanceBackBuffer();
	void recreateSwapchain(const WindowCreateInfo &createInfo);
	void present();
	void destroySwapchain();
	void createSwapchain();
	void chooseSurfaceFormat(const Array<VkSurfaceFormatKHR> &available, Gfx::SeFormat preferred);
	void choosePresentMode(const Array<VkPresentModeKHR> &modes);

	PTexture2D backBufferImages[Gfx::numFramesBuffered];
	PSemaphore renderFinished[Gfx::numFramesBuffered];
	PSemaphore imageAcquired[Gfx::numFramesBuffered];
	PSemaphore imageAcquiredSemaphore;

	PGraphics graphics;
	VkFormat pixelFormat;
	VkSampleCountFlags numSamples;
	VkPresentModeKHR presentMode;
	VkSwapchainKHR swapchain;
	VkSurfaceKHR surface;
	VkSurfaceFormatKHR surfaceFormat;
	void *windowHandle;
	int32 currentImageIndex;
	int32 acquiredImageIndex;
	int32 preAcquiredImageIndex;
	int32 semaphoreIndex;
	VkInstance instance;
};
DEFINE_REF(Window);

class Viewport : public Gfx::Viewport
{
public:
	Viewport(PGraphics graphics, PWindow owner, const ViewportCreateInfo &createInfo);
	virtual ~Viewport();
	virtual void resize(uint32 newX, uint32 newY);
	virtual void move(uint32 newOffsetX, uint32 newOffsetY);
	VkViewport getHandle() const { return handle; }
private:
	VkViewport handle;
	PGraphics graphics;
	friend class Graphics;
};
DECLARE_REF(Viewport);
} // namespace Vulkan
} // namespace Seele