#include "Common/Atomic.h"
#include "Core/ConfigManager.h"

#include "VideoCommon/BPStructs.h"
#include "VideoCommon/CommandProcessor.h"
#include "VideoCommon/Fifo.h"
#include "VideoCommon/FramebufferManagerBase.h"
#include "VideoCommon/MainBase.h"
#include "VideoCommon/OnScreenDisplay.h"
#include "VideoCommon/PixelEngine.h"
#include "VideoCommon/RenderBase.h"
#include "VideoCommon/TextureCacheBase.h"
#include "VideoCommon/VertexLoaderManager.h"
#include "VideoCommon/VideoBackendBase.h"
#include "VideoCommon/VideoConfig.h"
#include "VideoCommon/VideoState.h"

bool s_BackendInitialized = false;

volatile u32 s_swapRequested = false;
u32 s_efbAccessRequested = false;
volatile u32 s_FifoShuttingDown = false;

std::condition_variable s_perf_query_cond;
std::mutex s_perf_query_lock;
static volatile bool s_perf_query_requested;

static volatile struct
{
	u32 xfbAddr;
	u32 fbWidth;
	u32 fbHeight;
} s_beginFieldArgs;

static struct
{
	EFBAccessType type;
	u32 x;
	u32 y;
	u32 Data;
} s_accessEFBArgs;

static u32 s_AccessEFBResult = 0;

void VideoBackendHardware::EmuStateChange(EMUSTATE_CHANGE newState)
{
	EmulatorState((newState == EMUSTATE_CHANGE_PLAY) ? true : false);
}

// Enter and exit the video loop
void VideoBackendHardware::Video_EnterLoop()
{
	RunGpuLoop();
}

void VideoBackendHardware::Video_ExitLoop()
{
	ExitGpuLoop();
	s_FifoShuttingDown = true;
}

void VideoBackendHardware::Video_SetRendering(bool bEnabled)
{
	Fifo_SetRendering(bEnabled);
}

// Run from the graphics thread (from Fifo.cpp)
void VideoFifo_CheckSwapRequest()
{
	if (g_ActiveConfig.bUseXFB)
	{
		if (Common::AtomicLoadAcquire(s_swapRequested))
		{
			EFBRectangle rc;
			Renderer::Swap(s_beginFieldArgs.xfbAddr, s_beginFieldArgs.fbWidth, s_beginFieldArgs.fbHeight,rc);
			Common::AtomicStoreRelease(s_swapRequested, false);
		}
	}
}

// Run from the graphics thread (from Fifo.cpp)
void VideoFifo_CheckSwapRequestAt(u32 xfbAddr, u32 fbWidth, u32 fbHeight)
{
	if (g_ActiveConfig.bUseXFB)
	{
		if (Common::AtomicLoadAcquire(s_swapRequested))
		{
			u32 aLower = xfbAddr;
			u32 aUpper = xfbAddr + 2 * fbWidth * fbHeight;
			u32 bLower = s_beginFieldArgs.xfbAddr;
			u32 bUpper = s_beginFieldArgs.xfbAddr + 2 * s_beginFieldArgs.fbWidth * s_beginFieldArgs.fbHeight;

			if (addrRangesOverlap(aLower, aUpper, bLower, bUpper))
				VideoFifo_CheckSwapRequest();
		}
	}
}

// Run from the CPU thread (from VideoInterface.cpp)
void VideoBackendHardware::Video_BeginField(u32 xfbAddr, u32 fbWidth, u32 fbHeight)
{
	if (s_BackendInitialized && g_ActiveConfig.bUseXFB)
	{
		if (!SConfig::GetInstance().m_LocalCoreStartupParameter.bCPUThread)
			VideoFifo_CheckSwapRequest();
		s_beginFieldArgs.xfbAddr = xfbAddr;
		s_beginFieldArgs.fbWidth = fbWidth;
		s_beginFieldArgs.fbHeight = fbHeight;
	}
}

// Run from the CPU thread (from VideoInterface.cpp)
void VideoBackendHardware::Video_EndField()
{
	if (s_BackendInitialized)
	{
		Common::AtomicStoreRelease(s_swapRequested, true);
	}
}

void VideoBackendHardware::Video_AddMessage(const std::string& msg, u32 milliseconds)
{
	OSD::AddMessage(msg, milliseconds);
}

void VideoBackendHardware::Video_ClearMessages()
{
	OSD::ClearMessages();
}

// Screenshot
bool VideoBackendHardware::Video_Screenshot(const std::string& filename)
{
	Renderer::SetScreenshot(filename.c_str());
	return true;
}

void VideoFifo_CheckEFBAccess()
{
	if (Common::AtomicLoadAcquire(s_efbAccessRequested))
	{
		s_AccessEFBResult = g_renderer->AccessEFB(s_accessEFBArgs.type, s_accessEFBArgs.x, s_accessEFBArgs.y, s_accessEFBArgs.Data);

		Common::AtomicStoreRelease(s_efbAccessRequested, false);
	}
}

u32 VideoBackendHardware::Video_AccessEFB(EFBAccessType type, u32 x, u32 y, u32 InputData)
{
	if (s_BackendInitialized && g_ActiveConfig.bEFBAccessEnable)
	{
		s_accessEFBArgs.type = type;
		s_accessEFBArgs.x = x;
		s_accessEFBArgs.y = y;
		s_accessEFBArgs.Data = InputData;

		Common::AtomicStoreRelease(s_efbAccessRequested, true);

		if (SConfig::GetInstance().m_LocalCoreStartupParameter.bCPUThread)
		{
			while (Common::AtomicLoadAcquire(s_efbAccessRequested) && !s_FifoShuttingDown)
				//Common::SleepCurrentThread(1);
				Common::YieldCPU();
		}
		else
			VideoFifo_CheckEFBAccess();

		return s_AccessEFBResult;
	}

	return 0;
}

static bool QueryResultIsReady()
{
	return !s_perf_query_requested || s_FifoShuttingDown;
}

void VideoFifo_CheckPerfQueryRequest()
{
	if (s_perf_query_requested)
	{
		g_perf_query->FlushResults();

		{
		std::lock_guard<std::mutex> lk(s_perf_query_lock);
		s_perf_query_requested = false;
		}

		s_perf_query_cond.notify_one();
	}
}

u32 VideoBackendHardware::Video_GetQueryResult(PerfQueryType type)
{
	if (!g_perf_query->ShouldEmulate())
	{
		return 0;
	}

	// TODO: Is this check sane?
	if (!g_perf_query->IsFlushed())
	{
		if (SConfig::GetInstance().m_LocalCoreStartupParameter.bCPUThread)
		{
			s_perf_query_requested = true;
			std::unique_lock<std::mutex> lk(s_perf_query_lock);
			s_perf_query_cond.wait(lk, QueryResultIsReady);
		}
		else
			g_perf_query->FlushResults();
	}

	return g_perf_query->GetQueryResult(type);
}

void VideoBackendHardware::InitializeShared()
{
	VideoCommon_Init();

	s_swapRequested = 0;
	s_efbAccessRequested = 0;
	s_perf_query_requested = false;
	s_FifoShuttingDown = 0;
	memset((void*)&s_beginFieldArgs, 0, sizeof(s_beginFieldArgs));
	memset(&s_accessEFBArgs, 0, sizeof(s_accessEFBArgs));
	s_AccessEFBResult = 0;
	m_invalid = false;
}

// Run from the CPU thread
void VideoBackendHardware::DoState(PointerWrap& p)
{
	bool software = false;
	p.Do(software);

	if (p.GetMode() == PointerWrap::MODE_READ && software == true)
	{
		// change mode to abort load of incompatible save state.
		p.SetMode(PointerWrap::MODE_VERIFY);
	}

	VideoCommon_DoState(p);
	p.DoMarker("VideoCommon");

	p.Do(s_swapRequested);
	p.Do(s_efbAccessRequested);
	p.Do(s_beginFieldArgs);
	p.Do(s_accessEFBArgs);
	p.Do(s_AccessEFBResult);
	p.DoMarker("VideoBackendHardware");

	// Refresh state.
	if (p.GetMode() == PointerWrap::MODE_READ)
	{
		m_invalid = true;
		RecomputeCachedArraybases();

		// Clear all caches that touch RAM
		// (? these don't appear to touch any emulation state that gets saved. moved to on load only.)
		VertexLoaderManager::MarkAllDirty();
	}
}

void VideoBackendHardware::CheckInvalidState()
{
	if (m_invalid)
	{
		m_invalid = false;

		BPReload();
		TextureCache::Invalidate();
	}
}

void VideoBackendHardware::PauseAndLock(bool doLock, bool unpauseOnUnlock)
{
	Fifo_PauseAndLock(doLock, unpauseOnUnlock);
}


void VideoBackendHardware::RunLoop(bool enable)
{
	VideoCommon_RunLoop(enable);
}

void VideoFifo_CheckAsyncRequest()
{
	VideoFifo_CheckSwapRequest();
	VideoFifo_CheckEFBAccess();
	VideoFifo_CheckPerfQueryRequest();
}

void VideoBackendHardware::Video_GatherPipeBursted()
{
	CommandProcessor::GatherPipeBursted();
}

bool VideoBackendHardware::Video_IsPossibleWaitingSetDrawDone()
{
	return CommandProcessor::isPossibleWaitingSetDrawDone;
}

bool VideoBackendHardware::Video_IsHiWatermarkActive()
{
	return CommandProcessor::isHiWatermarkActive;
}

void VideoBackendHardware::Video_AbortFrame()
{
	CommandProcessor::AbortFrame();
}

void VideoBackendHardware::RegisterCPMMIO(MMIO::Mapping* mmio, u32 base)
{
	CommandProcessor::RegisterMMIO(mmio, base);
}

void VideoBackendHardware::RegisterPEMMIO(MMIO::Mapping* mmio, u32 base)
{
	PixelEngine::RegisterMMIO(mmio, base);
}