#ifndef __URDE_CGRAPHICS_HPP__
#define __URDE_CGRAPHICS_HPP__

#include "boo/graphicsdev/IGraphicsDataFactory.hpp"
#include "boo/graphicsdev/IGraphicsCommandQueue.hpp"

#include "RetroTypes.hpp"
#include "zeus/CTransform.hpp"
#include "zeus/CVector2i.hpp"
#include "zeus/CColor.hpp"

#include "hecl/Runtime.hpp"

namespace urde
{
class CLight;
class CTimeProvider;

enum class ERglLight : u8
{
    Zero = 0,
    One,
    Two,
    Three,
    Four,
    Five,
    Six,
    Seven
};

enum class ERglLightBits : u8
{
    None  = 0,
    Zero  = 1,
    One   = 1 << 1,
    Two   = 1 << 2,
    Three = 1 << 3,
    Four  = 1 << 4,
    Five  = 1 << 5,
    Six   = 1 << 6,
    Seven = 1 << 7
};
ENABLE_BITWISE_ENUM(ERglLightBits)

enum class ERglEnum
{
    Never   = 0,
    Less    = 1,
    Equal   = 2,
    LEqual  = 3,
    Greater = 4,
    NEqual  = 5,
    GEqual  = 6,
    Always  = 7
};

enum class ERglBlendMode
{
    None     = 0,
    Blend    = 1,
    Logic    = 2,
    Subtract = 3
};

enum class ERglBlendFactor
{
    Zero        = 0,
    One         = 1,
    SrcColor    = 2,
    InvSrcColor = 3,
    SrcAlpha    = 4,
    InvSrcAlpha = 5,
    DstAlpha    = 6,
    InvDstAlpha = 7
};

enum class ERglLogicOp
{
    Clear   = 0,
    And     = 1,
    RevAnd  = 2,
    Copy    = 3,
    InvAnd  = 4,
    NoOp    = 5,
    Xor     = 6,
    Or      = 7,
    Nor     = 8,
    Equiv   = 9,
    Inv     = 10,
    RevOr   = 11,
    InvCopy = 12,
    InvOr   = 13,
    NAnd    = 14,
    Set     = 15
};

enum class ERglCullMode
{
    None  = 0,
    Front = 1,
    Back  = 2,
    All   = 3
};

enum class ERglAlphaFunc
{
    Never   = 0,
    Less    = 1,
    Equal   = 2,
    LEqual  = 3,
    Greater = 4,
    NEqual  = 5,
    GEqual  = 6,
    Always  = 7
};

enum class ERglAlphaOp
{
    And  = 0,
    Or   = 1,
    Xor  = 2,
    XNor = 3
};

enum class ERglFogMode
{
    None         = 0x00,

    PerspLin     = 0x02,
    PerspExp     = 0x04,
    PerspExp2    = 0x05,
    PerspRevExp  = 0x06,
    PerspRevExp2 = 0x07,

    OrthoLin     = 0x0A,
    OrthoExp     = 0x0C,
    OrthoExp2    = 0x0D,
    OrthoRevExp  = 0x0E,
    OrthoRevExp2 = 0x0F
};

struct SViewport
{
    u32 x0_left;
    u32 x4_top;
    u32 x8_width;
    u32 xc_height;
    float x10_halfWidth;
    float x14_halfHeight;
};

extern SViewport g_Viewport;

struct SClipScreenRect
{
    bool x0_valid = false;
    int x4_left = 0;
    int x8_top = 0;
    int xc_width = 0;
    int x10_height = 0;
    int x14_dstWidth = 0;
    float x18_uvXMin = 0.f;
    float x1c_uvXMax = 0.f;
    float x20_uvYMin = 0.f;
    float x24_uvYMax = 0.f;
    
    SClipScreenRect() = default;
    SClipScreenRect(bool valid, int left, int top, int width, int height, int dstWidth,
                    float uvXMin, float uvXMax, float uvYMin, float uvYMax)
    : x0_valid(valid), x4_left(left), x8_top(top), xc_width(width), x10_height(height), x14_dstWidth(dstWidth),
      x18_uvXMin(uvXMin), x1c_uvXMax(uvXMax), x20_uvYMin(uvYMin), x24_uvYMax(uvYMax) {}
    
    SClipScreenRect(const boo::SWindowRect& rect)
    {
        x4_left = rect.location[0];
        x8_top = rect.location[1];
        xc_width = rect.size[0];
        x10_height = rect.size[1];
        x14_dstWidth = rect.size[0];
    }

    SClipScreenRect(const SViewport& vp)
    {
        x4_left = vp.x0_left;
        x8_top = vp.x4_top;
        xc_width = vp.x8_width;
        x10_height = vp.xc_height;
    }
};

enum class ETexelFormat
{
    I4      = 0,
    I8      = 1,
    IA4     = 2,
    IA8     = 3,
    C4      = 4,
    C8      = 5,
    C14X2   = 6,
    RGB565  = 7,
    RGB5A3  = 8,
    RGBA8   = 9,
    CMPR    = 10,
    RGBA8PC = 16,
    C8PC    = 17,
    CMPRPC  = 18,
};

#define DEPTH_FAR 1.f
#define DEPTH_SKY 0.999f
#define DEPTH_TARGET_MANAGER 0.12500012f
#define DEPTH_WORLD (1.f / 8.f)
#define DEPTH_GUN (1.f / 32.f)
#define DEPTH_SCREEN_ACTORS (1.f / 64.f)
#define DEPTH_HUD (1.f / 512.f)
#define DEPTH_NEAR 0.f

class CGraphics
{
public:

    struct CProjectionState
    {
        bool x0_persp;
        float x4_left;
        float x8_right;
        float xc_top;
        float x10_bottom;
        float x14_near;
        float x18_far;
    };

    struct CFogState
    {
        zeus::CColor m_color;
        float m_rangeScale = 0.f;
        float m_start = 4096.f;
    };

    static CProjectionState g_Proj;
    static zeus::CVector2f g_CachedDepthRange;
    static CFogState g_Fog;
    static zeus::CColor g_ColorRegs[3];
    static float g_ProjAspect;
    static u32 g_NumLightsActive;
    static u32 g_NumBreakpointsWaiting;
    static u32 g_FlippingState;
    static bool g_LastFrameUsedAbove;
    static bool g_InterruptLastFrameUsedAbove;
    static ERglLightBits g_LightActive;
    static ERglLightBits g_LightsWereOn;
    static zeus::CTransform g_GXModelView;
    static zeus::CTransform g_GXModelViewInvXpose;
    static zeus::CTransform g_GXModelMatrix;
    static zeus::CTransform g_ViewMatrix;
    static zeus::CVector3f g_ViewPoint;
    static zeus::CTransform g_GXViewPointMatrix;
    static zeus::CTransform g_CameraMatrix;
    static SClipScreenRect g_CroppedViewport;
    static bool g_IsGXModelMatrixIdentity;

    static void DisableAllLights();
    static void LoadLight(ERglLight light, const CLight& info);
    static void EnableLight(ERglLight light);
    static void SetLightState(ERglLightBits lightState);
    static void SetAmbientColor(const zeus::CColor& col);
    static void SetFog(ERglFogMode mode, float startz, float endz, const zeus::CColor& color);
    static void SetDepthWriteMode(bool test, ERglEnum comp, bool write);
    static void SetBlendMode(ERglBlendMode, ERglBlendFactor, ERglBlendFactor, ERglLogicOp);
    static void SetCullMode(ERglCullMode);
    static void BeginScene();
    static void EndScene();
    static void SetAlphaCompare(ERglAlphaFunc comp0, u8 ref0, ERglAlphaOp op, ERglAlphaFunc comp1, u8 ref1);
    static void SetViewPointMatrix(const zeus::CTransform& xf);
    static void SetViewMatrix();
    static void SetModelMatrix(const zeus::CTransform& xf);
    static zeus::CMatrix4f CalculatePerspectiveMatrix(float fovy, float aspect,
                                                      float znear, float zfar,
                                                      bool forRenderer);
    static zeus::CMatrix4f GetPerspectiveProjectionMatrix(bool forRenderer);
    static const CProjectionState& GetProjectionState();
    static void SetProjectionState(const CProjectionState&);
    static void SetPerspective(float fovy, float aspect, float znear, float zfar);
    static void SetOrtho(float left, float right,
                         float top, float bottom,
                         float znear, float zfar);
    static void FlushProjection();
    static zeus::CVector2i ProjectPoint(const zeus::CVector3f& point);
    static SClipScreenRect ClipScreenRectFromMS(const zeus::CVector3f& p1, const zeus::CVector3f& p2);
    static SClipScreenRect ClipScreenRectFromVS(const zeus::CVector3f& p1, const zeus::CVector3f& p2);
    static zeus::CVector3f ProjectModelPointToViewportSpace(const zeus::CVector3f& point);

    static void SetViewportResolution(const zeus::CVector2i& res);
    static void SetViewport(int leftOff, int bottomOff, int width, int height);
    static void SetScissor(int leftOff, int bottomOff, int width, int height);
    static void SetDepthRange(float near, float far);

    static CTimeProvider* g_ExternalTimeProvider;
    static float g_DefaultSeconds;
    static u32 g_RenderTimings;
    static void SetExternalTimeProvider(CTimeProvider* provider)
    {g_ExternalTimeProvider = provider;}
    static float GetSecondsMod900();
    static void TickRenderTimings();
    static u32 g_FrameCounter;
    static u32 GetFrameCounter() { return g_FrameCounter; }

    static boo::IGraphicsDataFactory::Platform g_BooPlatform;
    static const boo::SystemChar* g_BooPlatformName;
    static boo::IGraphicsDataFactory* g_BooFactory;
    static boo::IGraphicsCommandQueue* g_BooMainCommandQueue;
    static boo::ObjToken<boo::ITextureR> g_SpareTexture;

    static void InitializeBoo(boo::IGraphicsDataFactory* factory,
                              boo::IGraphicsCommandQueue* cc,
                              const boo::ObjToken<boo::ITextureR>& spareTex)
    {
        g_BooPlatform = factory->platform();
        g_BooPlatformName = factory->platformName();
        g_BooFactory = factory;
        g_BooMainCommandQueue = cc;
        g_SpareTexture = spareTex;
    }

    static void ShutdownBoo()
    {
        g_BooFactory = nullptr;
        g_BooMainCommandQueue = nullptr;
        g_SpareTexture.reset();
    }

    static const boo::SystemChar* PlatformName()
    {
        return g_BooPlatformName;
    }

    static void CommitResources(const boo::FactoryCommitFunc& commitFunc)
    {
        g_BooFactory->commitTransaction(commitFunc);
    }
    static void SetShaderDataBinding(const boo::ObjToken<boo::IShaderDataBinding>& binding)
    {
        g_BooMainCommandQueue->setShaderDataBinding(binding);
    }
    static void ResolveSpareTexture(const SClipScreenRect& rect, int bindIdx=0, bool clearDepth=false)
    {
        boo::SWindowRect wrect = {rect.x4_left, rect.x8_top, rect.xc_width, rect.x10_height};
        g_BooMainCommandQueue->resolveBindTexture(g_SpareTexture, wrect, true, bindIdx, true, false, clearDepth);
    }
    static void ResolveSpareDepth(const SClipScreenRect& rect, int bindIdx=0)
    {
        boo::SWindowRect wrect = {rect.x4_left, rect.x8_top, rect.xc_width, rect.x10_height};
        g_BooMainCommandQueue->resolveBindTexture(g_SpareTexture, wrect, true, bindIdx, false, true);
    }
    static void DrawInstances(size_t start, size_t count, size_t instCount)
    {
        g_BooMainCommandQueue->drawInstances(start, count, instCount);
    }
    static void DrawArray(size_t start, size_t count)
    {
        g_BooMainCommandQueue->draw(start, count);
    }
    static void DrawArrayIndexed(size_t start, size_t count)
    {
        g_BooMainCommandQueue->drawIndexed(start, count);
    }
};

template<class VTX>
class TriFanToStrip
{
    std::vector<VTX>& m_vec;
    size_t m_start;
    size_t m_added = 0;
public:
    explicit TriFanToStrip(std::vector<VTX>& vec) : m_vec(vec), m_start(vec.size()) {}

    void AddVert(const VTX& vert)
    {
        ++m_added;
        if (m_added > 3)
        {
            const VTX& last = m_vec.back();
            m_vec.reserve(m_vec.size() + 4);
            m_vec.push_back(m_vec[m_start]);
            m_vec.push_back(m_vec[m_start]);
            m_vec.push_back(last);
        }
        m_vec.push_back(vert);
    }

    template<class... _Args>
    void EmplaceVert(_Args&&... args)
    {
        ++m_added;
        if (m_added > 3)
        {
            const VTX& last = m_vec.back();
            m_vec.reserve(m_vec.size() + 4);
            m_vec.push_back(m_vec[m_start]);
            m_vec.push_back(m_vec[m_start]);
            m_vec.push_back(last);
        }
        m_vec.emplace_back(std::forward<_Args>(args)...);
    }

    void Draw() const { CGraphics::DrawArray(m_start, m_vec.size() - m_start); }
};

}

#endif // __URDE_CGRAPHICS_HPP__