#pragma once

#include "ppsspp_config.h"
#include "Common/Common.h"
#include "Common/MemoryUtil.h"
#include "GPU/GPUInterface.h"
#include "GPU/GPUState.h"
#include "GPU/Common/GPUDebugInterface.h"

#if defined(__ANDROID__)
#include <atomic>
#endif

class FramebufferManagerCommon;
class TextureCacheCommon;
class DrawEngineCommon;
class GraphicsContext;
namespace Draw {
	class DrawContext;
}

enum DrawType {
	DRAW_UNKNOWN,
	DRAW_PRIM,
	DRAW_SPLINE,
	DRAW_BEZIER,
};

enum {
	FLAG_FLUSHBEFOREONCHANGE = 2,
	FLAG_EXECUTE = 4,
	FLAG_EXECUTEONCHANGE = 8,
	FLAG_READS_PC = 16,
	FLAG_WRITES_PC = 32,
	FLAG_DIRTYONCHANGE = 64,  // NOTE: Either this or FLAG_EXECUTE*, not both!
};

struct TransformedVertex {
	union {
		struct {
			float x, y, z, pos_w;     // in case of morph, preblend during decode
		};
		float pos[4];
	};
	union {
		struct {
			float u; float v; float uv_w;   // scaled by uscale, vscale, if there
		};
		float uv[3];
	};
	float fog;
	union {
		u8 color0[4];   // prelit
		u32 color0_32;
	};
	union {
		u8 color1[4];   // prelit
		u32 color1_32;
	};


	void CopyFromWithOffset(const TransformedVertex &other, float xoff, float yoff) {
		this->x = other.x + xoff;
		this->y = other.y + yoff;
		memcpy(&this->z, &other.z, sizeof(*this) - sizeof(float) * 2);
	}
};

class GPUCommon : public GPUInterface, public GPUDebugInterface {
public:
	GPUCommon(GraphicsContext *gfxCtx, Draw::DrawContext *draw);
	virtual ~GPUCommon();

	Draw::DrawContext *GetDrawContext() override {
		return draw_;
	}
	virtual void CheckGPUFeatures() = 0;

	void UpdateCmdInfo();

	bool IsReady() override {
		return true;
	}
	void CancelReady() override {
	}
	void Reinitialize() override;

	void BeginHostFrame() override;
	void EndHostFrame() override;

	void InterruptStart(int listid) override;
	void InterruptEnd(int listid) override;
	void SyncEnd(GPUSyncType waitType, int listid, bool wokeThreads) override;
	void EnableInterrupts(bool enable) override {
		interruptsEnabled_ = enable;
	}

	void Resized() override;
	void DumpNextFrame() override;

	void ExecuteOp(u32 op, u32 diff) override;
	void PreExecuteOp(u32 op, u32 diff) override;

	bool InterpretList(DisplayList &list) override;
	void ProcessDLQueue();
	u32  UpdateStall(int listid, u32 newstall) override;
	u32  EnqueueList(u32 listpc, u32 stall, int subIntrBase, PSPPointer<PspGeListArgs> args, bool head) override;
	u32  DequeueList(int listid) override;
	int  ListSync(int listid, int mode) override;
	u32  DrawSync(int mode) override;
	int  GetStack(int index, u32 stackPtr) override;
	void DoState(PointerWrap &p) override;
	bool BusyDrawing() override;
	u32  Continue() override;
	u32  Break(int mode) override;
	void ReapplyGfxState() override;

	void CopyDisplayToOutput(bool reallyDirty) override = 0;
	void InitClear() override = 0;
	bool PerformMemoryCopy(u32 dest, u32 src, int size) override;
	bool PerformMemorySet(u32 dest, u8 v, int size) override;
	bool PerformMemoryDownload(u32 dest, int size) override;
	bool PerformMemoryUpload(u32 dest, int size) override;

	void InvalidateCache(u32 addr, int size, GPUInvalidationType type) override;
	void NotifyVideoUpload(u32 addr, int size, int width, int format) override;
	bool PerformStencilUpload(u32 dest, int size) override;

	void Execute_OffsetAddr(u32 op, u32 diff);
	void Execute_Vaddr(u32 op, u32 diff);
	void Execute_Iaddr(u32 op, u32 diff);
	void Execute_Origin(u32 op, u32 diff);
	void Execute_Jump(u32 op, u32 diff);
	void Execute_JumpFast(u32 op, u32 diff);
	void Execute_BJump(u32 op, u32 diff);
	void Execute_Call(u32 op, u32 diff);
	void Execute_CallFast(u32 op, u32 diff);
	void Execute_Ret(u32 op, u32 diff);
	void Execute_End(u32 op, u32 diff);

	void Execute_VertexType(u32 op, u32 diff);
	void Execute_VertexTypeSkinning(u32 op, u32 diff);

	void Execute_Prim(u32 op, u32 diff);
	void Execute_Bezier(u32 op, u32 diff);
	void Execute_Spline(u32 op, u32 diff);
	void Execute_BoundingBox(u32 op, u32 diff);
	void Execute_BlockTransferStart(u32 op, u32 diff);

	void Execute_LoadClut(u32 op, u32 diff);

	void Execute_TexSize0(u32 op, u32 diff);
	void Execute_TexLevel(u32 op, u32 diff);

	void Execute_WorldMtxNum(u32 op, u32 diff);
	void Execute_WorldMtxData(u32 op, u32 diff);
	void Execute_ViewMtxNum(u32 op, u32 diff);
	void Execute_ViewMtxData(u32 op, u32 diff);
	void Execute_ProjMtxNum(u32 op, u32 diff);
	void Execute_ProjMtxData(u32 op, u32 diff);
	void Execute_TgenMtxNum(u32 op, u32 diff);
	void Execute_TgenMtxData(u32 op, u32 diff);
	void Execute_BoneMtxNum(u32 op, u32 diff);
	void Execute_BoneMtxData(u32 op, u32 diff);

	void Execute_MorphWeight(u32 op, u32 diff);

	void Execute_ImmVertexAlphaPrim(u32 op, u32 diff);

	void Execute_Unknown(u32 op, u32 diff);

	int EstimatePerVertexCost();

	// Note: Not virtual!
	void Flush();
	void DispatchFlush() override;

#ifdef USE_CRT_DBG
#undef new
#endif
	void *operator new(size_t s) {
		return AllocateAlignedMemory(s, 16);
	}
	void operator delete(void *p) {
		FreeAlignedMemory(p);
	}
#ifdef USE_CRT_DBG
#define new DBG_NEW
#endif

	// From GPUDebugInterface.
	bool GetCurrentDisplayList(DisplayList &list) override;
	bool GetCurrentFramebuffer(GPUDebugBuffer &buffer, GPUDebugFramebufferType type, int maxRes) override;
	bool GetCurrentDepthbuffer(GPUDebugBuffer &buffer) override;
	bool GetCurrentStencilbuffer(GPUDebugBuffer &buffer) override;
	bool GetCurrentTexture(GPUDebugBuffer &buffer, int level) override;
	bool GetCurrentClut(GPUDebugBuffer &buffer) override;
	bool GetCurrentSimpleVertices(int count, std::vector<GPUDebugVertex> &vertices, std::vector<u16> &indices) override;
	bool GetOutputFramebuffer(GPUDebugBuffer &buffer) override;

	std::vector<std::string> DebugGetShaderIDs(DebugShaderType shader) override { return std::vector<std::string>(); };
	std::string DebugGetShaderString(std::string id, DebugShaderType shader, DebugShaderStringType stringType) override {
		return "N/A";
	}
	bool DescribeCodePtr(const u8 *ptr, std::string &name) override;

	std::vector<DisplayList> ActiveDisplayLists() override;
	void ResetListPC(int listID, u32 pc) override;
	void ResetListStall(int listID, u32 stall) override;
	void ResetListState(int listID, DisplayListState state) override;

	GPUDebugOp DissassembleOp(u32 pc, u32 op) override;
	std::vector<GPUDebugOp> DissassembleOpRange(u32 startpc, u32 endpc) override;

	void NotifySteppingEnter() override;
	void NotifySteppingExit() override;

	u32 GetRelativeAddress(u32 data) override;
	u32 GetVertexAddress() override;
	u32 GetIndexAddress() override;
	GPUgstate GetGState() override;
	void SetCmdValue(u32 op) override;

	void UpdateUVScaleOffset();

	DisplayList* getList(int listid) override {
		return &dls[listid];
	}

	const std::list<int>& GetDisplayLists() override {
		return dlQueue;
	}
	std::vector<FramebufferInfo> GetFramebufferList() override;
	void ClearShaderCache() override {}
	void CleanupBeforeUI() override {}

	s64 GetListTicks(int listid) override {
		if (listid >= 0 && listid < DisplayListMaxCount) {
			return dls[listid].waitTicks;
		}
		return -1;
	}

	bool FramebufferDirty() override;
	bool FramebufferReallyDirty() override;

	typedef void (GPUCommon::*CmdFunc)(u32 op, u32 diff);

	void GetReportingInfo(std::string &primaryInfo, std::string &fullInfo) override {
		primaryInfo = reportingPrimaryInfo_;
		fullInfo = reportingFullInfo_;
	}

protected:
	void DeviceLost() override;
	void DeviceRestore() override;

	inline bool IsTrianglePrim(GEPrimitiveType prim) const {
		return prim != GE_PRIM_RECTANGLES && prim > GE_PRIM_LINE_STRIP;
	}

	void SetDrawType(DrawType type, GEPrimitiveType prim) {
		if (type != lastDraw_) {
			// We always flush when drawing splines/beziers so no need to do so here
			gstate_c.Dirty(DIRTY_UVSCALEOFFSET | DIRTY_VERTEXSHADER_STATE);
			lastDraw_ = type;
		}
		// Prim == RECTANGLES can cause CanUseHardwareTransform to flip, so we need to dirty.
		// Also, culling may be affected so dirty the raster state.
		if (IsTrianglePrim(prim) != IsTrianglePrim(lastPrim_)) {
			Flush();
			gstate_c.Dirty(DIRTY_RASTER_STATE | DIRTY_VERTEXSHADER_STATE);
			lastPrim_ = prim;
		}
	}

	void BeginFrame() override;
	void UpdateVsyncInterval(bool force);

	virtual void FastRunLoop(DisplayList &list);

	void SlowRunLoop(DisplayList &list);
	void UpdatePC(u32 currentPC, u32 newPC);
	void UpdateState(GPURunState state);
	void PopDLQueue();
	void CheckDrawSync();
	int  GetNextListIndex();
	virtual void FastLoadBoneMatrix(u32 target);

	// TODO: Unify this.
	virtual void FinishDeferred() {}

	void DoBlockTransfer(u32 skipDrawReason);
	void DoExecuteCall(u32 target);

	void AdvanceVerts(u32 vertType, int count, int bytesRead) {
		if ((vertType & GE_VTYPE_IDX_MASK) != GE_VTYPE_IDX_NONE) {
			int indexShift = ((vertType & GE_VTYPE_IDX_MASK) >> GE_VTYPE_IDX_SHIFT) - 1;
			gstate_c.indexAddr += count << indexShift;
		} else {
			gstate_c.vertexAddr += bytesRead;
		}
	}

	size_t FormatGPUStatsCommon(char *buf, size_t size);

	FramebufferManagerCommon *framebufferManager_ = nullptr;
	TextureCacheCommon *textureCache_ = nullptr;
	DrawEngineCommon *drawEngineCommon_ = nullptr;
	ShaderManagerCommon *shaderManager_ = nullptr;
	bool flushOnParams_ = true;

	GraphicsContext *gfxCtx_;
	Draw::DrawContext *draw_;

	struct CommandInfo {
		uint64_t flags;
		GPUCommon::CmdFunc func;
	};

	static CommandInfo cmdInfo_[256];

	typedef std::list<int> DisplayListQueue;

	int nextListID;
	DisplayList dls[DisplayListMaxCount];
	DisplayList *currentList;
	DisplayListQueue dlQueue;

	bool interruptRunning = false;
	GPURunState gpuState = GPUSTATE_RUNNING;
	bool isbreak;
	u64 drawCompleteTicks;
	u64 busyTicks;

	int downcount;
	u64 startingTicks;
	u32 cycleLastPC;
	int cyclesExecuted;

	bool dumpNextFrame_ = false;
	bool dumpThisFrame_ = false;
	bool debugRecording_;
	bool interruptsEnabled_;
	bool resized_ = false;
	DrawType lastDraw_ = DRAW_UNKNOWN;
	GEPrimitiveType lastPrim_ = GE_PRIM_INVALID;

	int vertexCost_ = 0;

	// No idea how big this buffer needs to be.
	enum {
		MAX_IMMBUFFER_SIZE = 32,
	};

	TransformedVertex immBuffer_[MAX_IMMBUFFER_SIZE];
	int immCount_ = 0;
	GEPrimitiveType immPrim_;

	std::string reportingPrimaryInfo_;
	std::string reportingFullInfo_;

private:
	void FlushImm();
	// Debug stats.
	double timeSteppingStarted_;
	double timeSpentStepping_;
	int lastVsync_ = -1;
};

struct CommonCommandTableEntry {
	uint8_t cmd;
	uint8_t flags;
	uint64_t dirty;
	GPUCommon::CmdFunc func;
};