#include "CMapArea.hpp"
#include "GameGlobalObjects.hpp"
#include "CMappableObject.hpp"
#include "CToken.hpp"
#include "World/CWorld.hpp"
#include "World/CGameArea.hpp"
#include "CResFactory.hpp"

namespace urde
{
CMapArea::CMapArea(CInputStream& in, u32 size)
    : x0_magic(in.readUint32()),
      x4_version(in.readUint32Big()),
      x8_(in.readUint32Big()),
      xc_visibilityMode(EVisMode(in.readUint32Big())),
      x10_box(zeus::CAABox::ReadBoundingBoxBig(in)),
      x28_mappableObjCount(in.readUint32Big()),
      x2c_vertexCount(in.readUint32Big()),
      x30_surfaceCount(in.readUint32Big()),
      x34_size(size - 52)
{
    x44_buf.reset(new u8[x34_size]);
    in.readUBytesToBuf(x44_buf.get(), x34_size);
    PostConstruct();
}

void CMapArea::PostConstruct()
{
    x38_moStart = x44_buf.get();
    x3c_vertexStart = x38_moStart + (x28_mappableObjCount * 0x50);
    x40_surfaceStart = x3c_vertexStart + (x2c_vertexCount * 12);

    m_mappableObjects.reserve(x28_mappableObjCount);
    for (u32 i = 0, j=0 ; i<x28_mappableObjCount ; ++i, j += 0x50)
    {
        m_mappableObjects.emplace_back(x38_moStart + j);
        m_mappableObjects.back().PostConstruct(x44_buf.get());
    }

    u8* tmp = x3c_vertexStart;
    m_verts.reserve(x2c_vertexCount);
    for (u32 i = 0 ; i<x2c_vertexCount ; ++i)
    {
        float* fl = reinterpret_cast<float*>(tmp);
        m_verts.emplace_back(hecl::SBig(fl[0]), hecl::SBig(fl[1]), hecl::SBig(fl[2]));
        tmp += 12;
    }

    std::vector<u32> index;
    m_surfaces.reserve(x30_surfaceCount);
    for (u32 i = 0, j = 0 ; i<x30_surfaceCount ; ++i, j += 32)
    {
        m_surfaces.emplace_back(x40_surfaceStart + j);
        m_surfaces.back().PostConstruct(x44_buf.get(), index);
    }

    CGraphics::CommitResources([this, &index](boo::IGraphicsDataFactory::Context& ctx)
    {
        m_vbo = ctx.newStaticBuffer(boo::BufferUse::Vertex, m_verts.data(), 16, m_verts.size());
        m_ibo = ctx.newStaticBuffer(boo::BufferUse::Index, index.data(), 4, index.size());

        /* Only the map universe specifies Always; it draws a maximum of 133 instances */
        size_t instCount = (xc_visibilityMode == EVisMode::Always) ? 133 : 1;

        for (u32 i = 0 ; i<x30_surfaceCount ; ++i)
        {
            CMapAreaSurface& surf = m_surfaces[i];
            surf.m_instances.reserve(instCount);
            for (u32 inst = 0 ; inst < instCount ; ++inst)
            {
                surf.m_instances.emplace_back(ctx, m_vbo, m_ibo);
                CMapAreaSurface::Instance& instance = surf.m_instances.back();

                athena::io::MemoryReader r(surf.x1c_outlineOffset, INT_MAX);
                u32 outlineCount = r.readUint32Big();

                std::vector<CLineRenderer>& linePrims = instance.m_linePrims;
                linePrims.reserve(outlineCount * 2);
                for (u32 j=0 ; j<2 ; ++j)
                {
                    r.seek(4, athena::SeekOrigin::Begin);
                    for (u32 i=0 ; i<outlineCount ; ++i)
                    {
                        u32 count = r.readUint32Big();
                        r.seek(count);
                        r.seekAlign4();
                        linePrims.emplace_back(ctx, CLineRenderer::EPrimitiveMode::LineStrip, count, nullptr, false);
                    }
                }
            }
        }

        for (u32 i = 0 ; i<x28_mappableObjCount ; ++i)
        {
            CMappableObject& mapObj = m_mappableObjects[i];
            if (CMappableObject::IsDoorType(mapObj.GetType()))
                mapObj.m_doorSurface.emplace(ctx);
        }
        return true;
    });
}

bool CMapArea::GetIsVisibleToAutoMapper(bool worldVis, bool areaVis) const
{
    switch (xc_visibilityMode)
    {
    case EVisMode::Always:
        return true;
    case EVisMode::MapStationOrVisit:
        return worldVis || areaVis;
    case EVisMode::Visit:
        return areaVis;
    case EVisMode::Never:
        return false;
    default:
        return true;
    }
}

static const zeus::CVector3f MinesPostTransforms[3] =
{
    {0.f, 0.f, 200.f},
    {0.f, 0.f, 0.f},
    {0.f, 0.f, -200.f}
};
static const u8 MinesPostTransformIndices[] =
{
    0, // 00 Transport to Tallon Overworld South
    0, // 01 Quarry Access
    0, // 02 Main Quarry
    0, // 03 Waste Disposal
    0, // 04 Save Station Mines A
    0, // 05 Security Access A
    0, // 06 Ore Processing
    0, // 07 Mine Security Station
    0, // 08 Research Access
    0, // 09 Storage Depot B
    0, // 10 Elevator Access A
    0, // 11 Security Access B
    0, // 12 Storage Depot A
    0, // 13 Elite Research
    0, // 14 Elevator A
    1, // 15 Elite Control Access
    1, // 16 Elite Control
    1, // 17 Maintenance Tunnel
    1, // 18 Ventilation Shaft
    2, // 19 Phazon Processing Center
    1, // 20 Omega Research
    2, // 21 Transport Access
    2, // 22 Processing Center Access
    1, // 23 Map Station Mines
    1, // 24 Dynamo Access
    2, // 25 Transport to Magmoor Caverns South
    2, // 26 Elite Quarters
    1, // 27 Central Dynamo
    2, // 28 Elite Quarters Access
    1, // 29 Quarantine Access A
    1, // 30 Save Station Mines B
    2, // 31 Metroid Quarantine B
    1, // 32 Metroid Quarantine A
    2, // 33 Quarantine Access B
    2, // 34 Save Station Mines C
    1, // 35 Elevator Access B
    2, // 36 Fungal Hall B
    1, // 37 Elevator B
    2, // 38 Missile Station Mines
    2, // 39 Phazon Mining Tunnel
    2, // 40 Fungal Hall Access
    2, // 41 Fungal Hall A
};

zeus::CTransform CMapArea::GetAreaPostTransform(const IWorld& world, TAreaId aid) const
{
    if (world.IGetWorldAssetId() == g_ResFactory->TranslateOriginalToNew(0xB1AC4D65)) // Phazon Mines
    {
        const zeus::CTransform& areaXf = world.IGetAreaAlways(aid)->IGetTM();
        const zeus::CVector3f& postVec = MinesPostTransforms[MinesPostTransformIndices[aid]];
        return zeus::CTransform::Translate(postVec) * areaXf;
    }
    else
    {
        return world.IGetAreaAlways(aid)->IGetTM();
    }
}

const zeus::CVector3f& CMapArea::GetAreaPostTranslate(const IWorld& world, TAreaId aid)
{
    if (world.IGetWorldAssetId() == g_ResFactory->TranslateOriginalToNew(0xB1AC4D65)) // Phazon Mines
        return MinesPostTransforms[MinesPostTransformIndices[aid]];
    else
        return zeus::CVector3f::skZero;
}

CMapArea::CMapAreaSurface::CMapAreaSurface(const void* surfBuf)
{
    athena::io::MemoryReader r(surfBuf, 32);
    x0_normal = r.readVec3fBig();
    xc_centroid = r.readVec3fBig();
    x18_surfOffset = reinterpret_cast<const u8*>(uintptr_t(r.readUint32Big()));
    x1c_outlineOffset = reinterpret_cast<const u8*>(uintptr_t(r.readUint32Big()));
}

void CMapArea::CMapAreaSurface::PostConstruct(const u8* buf, std::vector<u32>& index)
{
    x18_surfOffset = buf + reinterpret_cast<uintptr_t>(x18_surfOffset);
    x1c_outlineOffset = buf + reinterpret_cast<uintptr_t>(x1c_outlineOffset);

    m_primStart = index.size();
    bool start = true;
    {
        athena::io::MemoryReader r(x18_surfOffset, INT_MAX);
        u32 primCount = r.readUint32Big();
        for (u32 i=0 ; i<primCount ; ++i)
        {
            GX::Primitive prim = GX::Primitive(r.readUint32Big());
            u32 count = r.readUint32Big();
            switch (prim)
            {
            case GX::Primitive::TRIANGLES:
            {
                for (u32 v=0 ; v<count ; v+=3)
                {
                    if (!start)
                    {
                        index.push_back(index.back());
                        index.push_back(r.readUByte());
                        index.push_back(index.back());
                    }
                    else
                    {
                        index.push_back(r.readUByte());
                        start = false;
                    }
                    index.push_back(r.readUByte());
                    index.push_back(r.readUByte());
                    index.push_back(index.back());
                }
                break;
            }
            case GX::Primitive::TRIANGLESTRIP:
            {
                if (!start)
                {
                    index.push_back(index.back());
                    index.push_back(r.readUByte());
                    index.push_back(index.back());
                }
                else
                {
                    index.push_back(r.readUByte());
                    start = false;
                }
                for (u32 v=1 ; v<count ; ++v)
                    index.push_back(r.readUByte());
                if (count & 1)
                    index.push_back(index.back());
                break;
            }
            case GX::Primitive::TRIANGLEFAN:
            {
                u8 firstVert = r.readUByte();
                if (!start)
                {
                    index.push_back(index.back());
                    index.push_back(r.readUByte());
                }
                else
                {
                    index.push_back(r.readUByte());
                    index.push_back(index.back());
                    start = false;
                }
                for (u32 v=1 ; v<count ; ++v)
                {
                    index.push_back(firstVert);
                    index.push_back(r.readUByte());
                }
                break;
            }
            default: break;
            }
            r.seekAlign4();
        }
    }
    m_primCount = index.size() - m_primStart;
}

void CMapArea::CMapAreaSurface::Draw(const zeus::CVector3f* verts, const zeus::CColor& surfColor,
                                     const zeus::CColor& lineColor, float lineWidth, int instIdx) const
{
    Instance& instance = const_cast<Instance&>(m_instances[instIdx]);

    if (surfColor.a)
        instance.m_surfacePrims.draw(surfColor, m_primStart, m_primCount);

    if (lineColor.a)
    {
        bool draw2 = lineWidth > 1.f;
        athena::io::MemoryReader r(x1c_outlineOffset, INT_MAX);
        u32 outlineCount = r.readUint32Big();

        std::vector<CLineRenderer>& linePrims = instance.m_linePrims;
        zeus::CColor color = lineColor;
        if (draw2)
            color.a *= 0.5f;
        float width = lineWidth;

        auto primIt = linePrims.begin();
        for (u32 j=0 ; j<=u32(draw2) ; ++j)
        {
            r.seek(4, athena::SeekOrigin::Begin);
            for (u32 i=0 ; i<outlineCount ; ++i)
            {
                CLineRenderer& prim = *primIt++;
                prim.Reset();
                u32 count = r.readUint32Big();
                for (u32 v=0 ; v<count ; ++v)
                {
                    u8 idx = r.readUByte();
                    prim.AddVertex(verts[idx], color, width);
                }
                r.seekAlign4();
                prim.Render();
            }
            width -= 1.f;
        }
    }
}

CFactoryFnReturn FMapAreaFactory(const SObjectTag& objTag, CInputStream& in, const CVParamTransfer&,
                                 CObjectReference*)
{
    u32 size = g_ResFactory->ResourceSize(objTag);
    return TToken<CMapArea>::GetIObjObjectFor(std::make_unique<CMapArea>(in, size));
}

}