#include "CGameArea.hpp"
#include "GameGlobalObjects.hpp"
#include "Graphics/CBooRenderer.hpp"
#include "CSimplePool.hpp"
#include "CStateManager.hpp"
#include "World/CScriptAreaAttributes.hpp"
#include "CGameState.hpp"
#include "DataSpec/DNAMP1/MREA.hpp"
#include "TCastTo.hpp"

namespace urde
{

static logvisor::Module Log("CGameArea");

CAreaRenderOctTree::CAreaRenderOctTree(const u8* buf)
: x0_buf(buf)
{
    athena::io::MemoryReader r(x0_buf + 8, INT32_MAX);
    x8_bitmapCount = r.readUint32Big();
    xc_meshCount = r.readUint32Big();
    x10_nodeCount = r.readUint32Big();
    x14_bitmapWordCount = (xc_meshCount + 31) / 32;
    x18_aabb.readBoundingBoxBig(r);

    x30_bitmaps = reinterpret_cast<const u32*>(x0_buf + 64);
    u32 wc = x14_bitmapWordCount * x8_bitmapCount;
    for (u32 i=0 ; i<wc ; ++i)
        const_cast<u32*>(x30_bitmaps)[i] = hecl::SBig(x30_bitmaps[i]);

    x34_indirectionTable = x30_bitmaps + wc;
    x38_entries = reinterpret_cast<const u8*>(x34_indirectionTable + x10_nodeCount);
    for (u32 i=0 ; i<x10_nodeCount ; ++i)
    {
        const_cast<u32*>(x34_indirectionTable)[i] = hecl::SBig(x34_indirectionTable[i]);
        Node* n = reinterpret_cast<Node*>(const_cast<u8*>(x38_entries) + x34_indirectionTable[i]);
        n->x0_bitmapIdx = hecl::SBig(n->x0_bitmapIdx);
        n->x2_flags = hecl::SBig(n->x2_flags);
        if (n->x2_flags)
        {
            u32 childCount = n->GetChildCount();
            for (u32 c=0 ; c<childCount ; ++c)
                n->x4_children[c] = hecl::SBig(n->x4_children[c]);
        }
    }
}

static const u32 ChildCounts[] = { 0, 2, 2, 4, 2, 4, 4, 8 };
u32 CAreaRenderOctTree::Node::GetChildCount() const
{
    return ChildCounts[x2_flags];
}

zeus::CAABox CAreaRenderOctTree::Node::GetNodeBounds(const zeus::CAABox& curAABB, int idx) const
{
    zeus::CVector3f center = curAABB.center();
    switch (x2_flags)
    {
    case 0:
    default:
        return curAABB;
    case 1:
        if (idx == 0)
            return {curAABB.min.x, curAABB.min.y, curAABB.min.z, center.x, curAABB.max.y, curAABB.max.z};
        else
            return {center.x, curAABB.min.y, curAABB.min.z, curAABB.max.x, curAABB.max.y, curAABB.max.z};
    case 2:
        if (idx == 0)
            return {curAABB.min.x, curAABB.min.y, curAABB.min.z, curAABB.max.x, center.y, curAABB.max.z};
        else
            return {curAABB.min.x, center.y, curAABB.min.z, curAABB.max.x, curAABB.max.y, curAABB.max.z};
    case 3:
    {
        switch (idx)
        {
        case 0:
        default:
            return {curAABB.min.x, curAABB.min.y, curAABB.min.z, center.x, center.y, curAABB.max.z};
        case 1:
            return {center.x, curAABB.min.y, curAABB.min.z, curAABB.max.x, center.y, curAABB.max.z};
        case 2:
            return {curAABB.min.x, center.y, curAABB.min.z, center.x, curAABB.max.y, curAABB.max.z};
        case 3:
            return {center.x, center.y, curAABB.min.z, curAABB.max.x, curAABB.max.y, curAABB.max.z};
        }
    }
    case 4:
        if (idx == 0)
            return {curAABB.min.x, curAABB.min.y, curAABB.min.z, curAABB.max.x, curAABB.max.y, center.z};
        else
            return {curAABB.min.x, curAABB.min.y, center.z, curAABB.max.x, curAABB.max.y, curAABB.max.z};
    case 5:
    {
        switch (idx)
        {
        case 0:
        default:
            return {curAABB.min.x, curAABB.min.y, curAABB.min.z, center.x, curAABB.max.y, center.z};
        case 1:
            return {center.x, curAABB.min.y, curAABB.min.z, curAABB.max.x, curAABB.max.y, center.z};
        case 2:
            return {curAABB.min.x, curAABB.min.y, center.z, center.x, curAABB.max.y, curAABB.max.z};
        case 3:
            return {center.x, curAABB.min.y, center.z, curAABB.max.x, curAABB.max.y, curAABB.max.z};
        }
    }
    case 6:
    {
        switch (idx)
        {
        case 0:
        default:
            return {curAABB.min.x, curAABB.min.y, curAABB.min.z, curAABB.max.x, center.y, center.z};
        case 1:
            return {curAABB.min.x, center.y, curAABB.min.z, curAABB.max.x, curAABB.max.y, center.z};
        case 2:
            return {curAABB.min.x, curAABB.min.y, center.z, curAABB.max.x, center.y, curAABB.max.z};
        case 3:
            return {curAABB.min.x, center.y, center.z, curAABB.max.x, curAABB.max.y, curAABB.max.z};
        }
    }
    case 7:
    {
        switch (idx)
        {
        case 0:
        default:
            return {curAABB.min.x, curAABB.min.y, curAABB.min.z, center.x, center.y, center.z};
        case 1:
            return {center.x, curAABB.min.y, curAABB.min.z, curAABB.max.x, center.y, center.z};
        case 2:
            return {curAABB.min.x, center.y, curAABB.min.z, center.x, curAABB.max.y, center.z};
        case 3:
            return {center.x, center.y, curAABB.min.z, curAABB.max.x, curAABB.max.y, center.z};
        case 4:
            return {curAABB.min.x, curAABB.min.y, center.z, center.x, center.y, curAABB.max.z};
        case 5:
            return {center.x, curAABB.min.y, center.z, curAABB.max.x, center.y, curAABB.max.z};
        case 6:
            return {curAABB.min.x, center.y, center.z, center.x, curAABB.max.y, curAABB.max.z};
        case 7:
            return {center.x, center.y, center.z, curAABB.max.x, curAABB.max.y, curAABB.max.z};
        }
    }
    }
}

void CAreaRenderOctTree::Node::RecursiveBuildOverlaps(u32* bmpOut,
                                                      const CAreaRenderOctTree& parent,
                                                      const zeus::CAABox& curAABB,
                                                      const zeus::CAABox& testAABB) const
{
    if (testAABB.intersects(curAABB))
    {
        if (curAABB.inside(testAABB))
        {
            const u32* bmp = &parent.x30_bitmaps[x0_bitmapIdx * parent.x14_bitmapWordCount];
            for (u32 c=0 ; c<parent.x14_bitmapWordCount ; ++c)
                bmpOut[c] |= bmp[c];
        }
        else
        {
            u32 childCount = GetChildCount();
            for (u32 c=0 ; c<childCount ; ++c)
            {
                zeus::CAABox childAABB = GetNodeBounds(curAABB, c);
                reinterpret_cast<Node*>(parent.x38_entries[parent.x34_indirectionTable[x4_children[c]]])->
                    RecursiveBuildOverlaps(bmpOut, parent, childAABB, testAABB);
            }
        }
    }
}

void CAreaRenderOctTree::FindOverlappingModels(std::vector<u32>& out, const zeus::CAABox& testAABB) const
{
    out.resize(x14_bitmapWordCount);
    reinterpret_cast<Node*>(x38_entries[x34_indirectionTable[0]])->
        RecursiveBuildOverlaps(out.data(), *this, x18_aabb, testAABB);
}

void CAreaRenderOctTree::FindOverlappingModels(u32* out, const zeus::CAABox& testAABB) const
{
    reinterpret_cast<Node*>(x38_entries[x34_indirectionTable[0]])->
        RecursiveBuildOverlaps(out, *this, x18_aabb, testAABB);
}

void CGameArea::CAreaFog::SetCurrent() const
{
    g_Renderer->SetWorldFog(x0_fogMode, x4_rangeCur[0], x4_rangeCur[1], x1c_colorCur);
}

void CGameArea::CAreaFog::Update(float dt)
{
    if (x0_fogMode == ERglFogMode::None)
        return;
    if (x1c_colorCur == x28_colorTarget && x4_rangeCur == xc_rangeTarget)
        return;

    float colorDelta = x34_colorDelta * dt;
    zeus::CVector2f rangeDelta = x14_rangeDelta * dt;

    for (u32 i=0 ; i<3 ; ++i)
    {
        float delta = x28_colorTarget[i] - x1c_colorCur[i];
        if (std::fabs(delta) <= colorDelta)
        {
            x1c_colorCur[i] = x28_colorTarget[i];
        }
        else
        {
            if (delta < 0.f)
                x1c_colorCur[i] -= colorDelta;
            else
                x1c_colorCur[i] += colorDelta;
        }
    }

    for (u32 i=0 ; i<2 ; ++i)
    {
        float delta = xc_rangeTarget[i] - x4_rangeCur[i];
        if (std::fabs(delta) <= rangeDelta[i])
        {
            x4_rangeCur[i] = xc_rangeTarget[i];
        }
        else
        {
            if (delta < 0.f)
                x4_rangeCur[i] -= rangeDelta[i];
            else
                x4_rangeCur[i] += rangeDelta[i];
        }
    }
}

void CGameArea::CAreaFog::RollFogOut(float rangeDelta, float colorDelta, const zeus::CColor& color)
{
    x14_rangeDelta = {rangeDelta, rangeDelta * 2.f};
    xc_rangeTarget = {4096.f, 4096.f};
    x34_colorDelta = colorDelta;
    x28_colorTarget = color;
}

void CGameArea::CAreaFog::FadeFog(ERglFogMode mode,
                                  const zeus::CColor& color, const zeus::CVector2f& vec1,
                                  float speed, const zeus::CVector2f& vec2)
{
    if (x0_fogMode == ERglFogMode::None)
    {
        x1c_colorCur = color;
        x28_colorTarget = color;
        x4_rangeCur = {vec1[1], vec1[1]};
        xc_rangeTarget = vec1;
    }
    else
    {
        x28_colorTarget = color;
        xc_rangeTarget = vec1;
    }
    x0_fogMode = mode;
    x34_colorDelta = speed;
    x14_rangeDelta = vec2;
}

void CGameArea::CAreaFog::SetFogExplicit(ERglFogMode mode, const zeus::CColor& color, const zeus::CVector2f& range)
{
    x0_fogMode = mode;
    x1c_colorCur = color;
    x28_colorTarget = color;
    x4_rangeCur = range;
    xc_rangeTarget = range;
}

bool CGameArea::CAreaFog::IsFogDisabled() const
{
    return x0_fogMode == ERglFogMode::None;
}

void CGameArea::CAreaFog::DisableFog()
{
    x0_fogMode = ERglFogMode::None;
}

static std::vector<SObjectTag> ReadDependencyList(CInputStream& in)
{
    std::vector<SObjectTag> ret;
    u32 count = in.readUint32Big();
    ret.reserve(count);
    for (u32 i=0 ; i<count ; ++i)
    {
        ret.emplace_back();
        ret.back().readMLVL(in);
    }
    return ret;
}

CDummyGameArea::CDummyGameArea(CInputStream& in, int idx, int mlvlVersion)
{
    x8_nameSTRG = in.readUint32Big();
    x14_transform.read34RowMajor(in);
    zeus::CAABox aabb;
    aabb.readBoundingBoxBig(in);
    xc_mrea = in.readUint32Big();
    if (mlvlVersion > 15)
        x10_areaId = in.readUint32Big();

    u32 attachAreaCount = in.readUint32Big();
    x44_attachedAreaIndices.reserve(attachAreaCount);
    for (u32 i=0 ; i<attachAreaCount ; ++i)
        x44_attachedAreaIndices.push_back(in.readUint16Big());

    ::urde::ReadDependencyList(in);
    ::urde::ReadDependencyList(in);

    if (mlvlVersion > 13)
    {
        u32 depCount = in.readUint32Big();
        for (u32 i=0 ; i<depCount ; ++i)
            in.readUint32Big();
    }

    u32 dockCount = in.readUint32Big();
    x54_docks.reserve(dockCount);
    for (u32 i=0 ; i<dockCount ; ++i)
        x54_docks.emplace_back(in, x14_transform);
}

bool CDummyGameArea::IGetScriptingMemoryAlways() const
{
    return false;
}

TAreaId CDummyGameArea::IGetAreaId() const
{
    return x10_areaId;
}

CAssetId CDummyGameArea::IGetAreaAssetId() const
{
    return xc_mrea;
}

bool CDummyGameArea::IIsActive() const
{
    return true;
}

TAreaId CDummyGameArea::IGetAttachedAreaId(int idx) const
{
    return x44_attachedAreaIndices[idx];
}

u32 CDummyGameArea::IGetNumAttachedAreas() const
{
    return x44_attachedAreaIndices.size();
}

CAssetId CDummyGameArea::IGetStringTableAssetId() const
{
    return x8_nameSTRG;
}

const zeus::CTransform& CDummyGameArea::IGetTM() const
{
    return x14_transform;
}

CGameArea::CGameArea(CInputStream& in, int idx, int mlvlVersion)
: x4_selfIdx(idx)
{
    xf0_25_active = true;
    x8_nameSTRG = in.readUint32Big();
    xc_transform.read34RowMajor(in);
    x3c_invTransform = xc_transform.inverse();
    x6c_aabb.readBoundingBoxBig(in);

    x84_mrea = in.readUint32Big();
    if (mlvlVersion > 15)
        x88_areaId = in.readUint32Big();
    else
        x88_areaId = -1;

    u32 attachedCount = in.readUint32Big();
    x8c_attachedAreaIndices.reserve(attachedCount);
    for (u32 i=0 ; i<attachedCount ; ++i)
        x8c_attachedAreaIndices.push_back(in.readUint16Big());

    x9c_deps1 = ::urde::ReadDependencyList(in);
    xac_deps2 = ::urde::ReadDependencyList(in);

    zeus::CAABox aabb = x6c_aabb.getTransformedAABox(xc_transform);
    x6c_aabb = aabb;

    if (mlvlVersion > 13)
    {
        u32 depCount = in.readUint32Big();
        xbc_layerDepOffsets.reserve(depCount);
        for (u32 i=0 ; i<depCount ; ++i)
            xbc_layerDepOffsets.push_back(in.readUint32Big());
    }

    u32 dockCount = in.readUint32Big();
    xcc_docks.reserve(dockCount);
    for (u32 i=0 ; i<dockCount ; ++i)
        xcc_docks.emplace_back(in, xc_transform);

    ClearTokenList();

    for (CToken& tok : xdc_tokens)
        xec_totalResourcesSize += g_ResFactory->ResourceSize(*tok.GetObjectTag());

    xec_totalResourcesSize += g_ResFactory->ResourceSize(SObjectTag{FOURCC('MREA'), x84_mrea});
}

CGameArea::CGameArea(CAssetId mreaId)
: x84_mrea(mreaId)
{
    while (StartStreamingMainArea())
        for (auto& req : xf8_loadTransactions)
            req->WaitUntilComplete();

    MREAHeader header = VerifyHeader();
    x12c_postConstructed->x4c_insts.resize(header.modelCount);

    FillInStaticGeometry(false);

    CBooModel::SetDummyTextures(true);
    CBooModel::EnableShadowMaps(g_Renderer->x220_sphereRamp.get(), zeus::CTransform::Identity());
    CGraphics::CProjectionState backupProj = CGraphics::GetProjectionState();
    zeus::CTransform backupViewPoint = CGraphics::g_ViewMatrix;
    zeus::CTransform backupModel = CGraphics::g_GXModelMatrix;
    CGraphics::SetViewPointMatrix(zeus::CTransform::Translate(0.f, -2048.f, 0.f));
    CGraphics::SetOrtho(-2048.f, 2048.f, 2048.f, -2048.f, 0.f, 4096.f);
    CModelFlags defaultFlags;
    for (CMetroidModelInstance& inst : x12c_postConstructed->x4c_insts)
    {
        CGraphics::SetModelMatrix(zeus::CTransform::Translate(-inst.x34_aabb.center()));
        inst.m_instance->UpdateUniformData(defaultFlags, nullptr, nullptr);
        inst.m_instance->WarmupDrawSurfaces();
    }
    CGraphics::SetProjectionState(backupProj);
    CGraphics::SetViewPointMatrix(backupViewPoint);
    CGraphics::SetModelMatrix(backupModel);
    CBooModel::DisableShadowMaps();
    CBooModel::SetDummyTextures(false);
}

bool CGameArea::IGetScriptingMemoryAlways() const
{
    return false;
}

bool CGameArea::IIsActive() const
{
    return false;
}

TAreaId CGameArea::IGetAttachedAreaId(int idx) const
{
    return x8c_attachedAreaIndices[idx];
}

u32 CGameArea::IGetNumAttachedAreas() const
{
    return x8c_attachedAreaIndices.size();
}

CAssetId CGameArea::IGetStringTableAssetId() const
{
    return x8_nameSTRG;
}

const zeus::CTransform& CGameArea::IGetTM() const
{
    return xc_transform;
}

void CGameArea::SetPauseState(bool paused)
{
    if (xf0_26_tokensReady)
        return;
    xf0_27_paused = paused;
    if (!paused)
        return;

    for (CToken& tok : xdc_tokens)
        if (!tok.IsLoaded())
            tok.Unlock();
}

void CGameArea::SetXRaySpeedAndTarget(float f1, float f2)
{
    x12c_postConstructed->x112c_xraySpeed = f1;
    x12c_postConstructed->x1130_xrayTarget = f2;
}

void CGameArea::SetThermalSpeedAndTarget(float speed, float target)
{
    x12c_postConstructed->x1120_thermalSpeed = speed;
    x12c_postConstructed->x1124_thermalTarget = target;
}

void CGameArea::SetWeaponWorldLighting(float speed, float target)
{
    x12c_postConstructed->x1134_weaponWorldLightingSpeed = speed;
    x12c_postConstructed->x1138_weaponWorldLightingTarget = target;
}

float CGameArea::GetXRayFogDistance() const
{
    const CScriptAreaAttributes* attrs = x12c_postConstructed->x10d8_areaAttributes;
    if (attrs)
        return attrs->GetXRayFogDistance();
    return 1.f;
}

EEnvFxType CGameArea::DoesAreaNeedEnvFx() const
{
    const CPostConstructed* postConstructed = GetPostConstructed();
    if (!postConstructed)
        return EEnvFxType::None;

    const CScriptAreaAttributes* attrs = postConstructed->x10d8_areaAttributes;
    if (attrs)
        return EEnvFxType::None;
    if (postConstructed->x10dc_occlusionState == EOcclusionState::Occluded)
        return EEnvFxType::None;
    return attrs->GetEnvFxType();
}

bool CGameArea::DoesAreaNeedSkyNow() const
{
    return false;
}

void CGameArea::UpdateFog(float dt)
{
}

bool CGameArea::OtherAreaOcclusionChanged()
{
    return false;
}

void CGameArea::PingOcclusionState()
{
}

void CGameArea::PreRender()
{
}

void CGameArea::UpdateThermalVisor(float dt)
{
    if (x12c_postConstructed->x1120_thermalSpeed == 0.f)
        return;

    float influence = x12c_postConstructed->x111c_thermalCurrent;

    float delta = x12c_postConstructed->x1120_thermalSpeed * dt;
    if (std::fabs(x12c_postConstructed->x1124_thermalTarget -
                  x12c_postConstructed->x111c_thermalCurrent) < delta)
    {
        influence = x12c_postConstructed->x1124_thermalTarget;
        x12c_postConstructed->x1120_thermalSpeed = 0.f;
    }
    else if (x12c_postConstructed->x1124_thermalTarget < influence)
        influence -= delta;
    else
        influence += delta;

    x12c_postConstructed->x111c_thermalCurrent = influence;
}

void CGameArea::UpdateWeaponWorldLighting(float dt)
{
    float newLightingLevel = x12c_postConstructed->x1128_worldLightingLevel;
    if (x12c_postConstructed->x112c_xraySpeed != 0)
    {
        float speed = dt * x12c_postConstructed->x112c_xraySpeed;
        if (std::fabs(x12c_postConstructed->x1130_xrayTarget - newLightingLevel) < speed)
        {
            newLightingLevel = x12c_postConstructed->x1130_xrayTarget;
            x12c_postConstructed->x1134_weaponWorldLightingSpeed = 0.f;
        }
        else if (x12c_postConstructed->x1130_xrayTarget < newLightingLevel)
        {
            newLightingLevel -= speed;
        }
        else
        {
            newLightingLevel += speed;
        }
    }

    if (x12c_postConstructed->x1134_weaponWorldLightingSpeed != 0.f)
    {
        float newWeaponWorldLightingLevel = x12c_postConstructed->x1128_worldLightingLevel;
        float speed = dt * x12c_postConstructed->x1134_weaponWorldLightingSpeed;
        if (std::fabs(x12c_postConstructed->x1138_weaponWorldLightingTarget - newLightingLevel) < speed)
        {
            newWeaponWorldLightingLevel = x12c_postConstructed->x1138_weaponWorldLightingTarget;
            x12c_postConstructed->x1134_weaponWorldLightingSpeed = 0.f;
        }
        else if (x12c_postConstructed->x1138_weaponWorldLightingTarget < newWeaponWorldLightingLevel)
        {
            newWeaponWorldLightingLevel -= speed;
        }
        else
        {
            newWeaponWorldLightingLevel += speed;
        }
        if (x12c_postConstructed->x112c_xraySpeed != 0.f)
        {
            newLightingLevel = std::min(newLightingLevel, newWeaponWorldLightingLevel);
        }
        else
        {
            newLightingLevel = newWeaponWorldLightingLevel;
        }
    }

    if (std::fabs(x12c_postConstructed->x1128_worldLightingLevel - newLightingLevel) >= 0.00001f)
    {
        x12c_postConstructed->x1128_worldLightingLevel = newLightingLevel;
        for (CEntity* ent : *x12c_postConstructed->x10c0_areaObjs)
            if (TCastToPtr<CActor> act = ent)
                act->SetWorldLightingDirty(true);
    }
}

void CGameArea::AliveUpdate(float dt)
{
    if (x12c_postConstructed->x10dc_occlusionState == EOcclusionState::Occluded)
        x12c_postConstructed->x10e4_ += dt;
    else
        x12c_postConstructed->x10e4_ = 0.f;
    UpdateFog(dt);
    UpdateThermalVisor(dt);
    UpdateWeaponWorldLighting(dt);
}

void CGameArea::SetOcclusionState(EOcclusionState state)
{
    if (!xf0_24_postConstructed || x12c_postConstructed->x10dc_occlusionState == state)
        return;

    if (state == EOcclusionState::Occluded)
    {
        ReloadAllUnloadedTextures();
        AddStaticGeometry();
    }
    else
    {
        x12c_postConstructed->x1108_26_ = true;
        x12c_postConstructed->x1108_27_ = false;
        RemoveStaticGeometry();
    }
}

void CGameArea::RemoveStaticGeometry()
{
    if (!xf0_24_postConstructed || !x12c_postConstructed ||
        x12c_postConstructed->x10dc_occlusionState == EOcclusionState::Occluded)
        return;
    x12c_postConstructed->x10e0_ = 0;
    x12c_postConstructed->x10dc_occlusionState = EOcclusionState::Occluded;
    g_Renderer->RemoveStaticGeometry(&x12c_postConstructed->x4c_insts);
}

void CGameArea::AddStaticGeometry()
{
    if (x12c_postConstructed->x10dc_occlusionState != EOcclusionState::Visible)
    {
        x12c_postConstructed->x10e0_ = 0;
        x12c_postConstructed->x10dc_occlusionState = EOcclusionState::Visible;
        if (!x12c_postConstructed->x1108_25_modelsConstructed)
            FillInStaticGeometry();
        g_Renderer->AddStaticGeometry(&x12c_postConstructed->x4c_insts,
                                      x12c_postConstructed->xc_octTree ?
                                          &*x12c_postConstructed->xc_octTree : nullptr,
                                      x4_selfIdx);
    }
}

EChain CGameArea::SetChain(CGameArea* next, EChain setChain)
{
    if (x138_curChain == setChain)
        return x138_curChain;

    if (x134_prev)
        x134_prev->x130_next = x130_next;
    if (x130_next)
        x130_next->x134_prev = x134_prev;

    x134_prev = nullptr;
    x130_next = next;
    if (next)
        next->x134_prev = this;

    EChain ret = x138_curChain;
    x138_curChain = setChain;
    return ret;
}

bool CGameArea::StartStreamingMainArea()
{
    if (xf0_24_postConstructed)
        return false;

    switch (xf4_phase)
    {
    case EPhase::LoadHeader:
    {
        x110_mreaSecBufs.reserve(3);
        AllocNewAreaData(0, 96);
        x12c_postConstructed.reset(new CPostConstructed());
        xf4_phase = EPhase::LoadSecSizes;
        break;
    }
    case EPhase::LoadSecSizes:
    {
        CullDeadAreaRequests();
        if (xf8_loadTransactions.size())
            break;
        MREAHeader header = VerifyHeader();
        AllocNewAreaData(x110_mreaSecBufs[0].second, ROUND_UP_32(header.secCount * 4));
        xf4_phase = EPhase::ReserveSections;
        break;
    }
    case EPhase::ReserveSections:
    {
        CullDeadAreaRequests();
        if (xf8_loadTransactions.size())
            break;
        //x110_mreaSecBufs.reserve(GetNumPartSizes() + 2);
        x124_secCount = 0;
        x128_mreaDataOffset = x110_mreaSecBufs[0].second + x110_mreaSecBufs[1].second;
        xf4_phase = EPhase::LoadDataSections;
        break;
    }
    case EPhase::LoadDataSections:
    {
        CullDeadAreaRequests();

        u32 totalSz = 0;
        u32 secCount = GetNumPartSizes();
        for (u32 i=0 ; i<secCount ; ++i)
            totalSz += hecl::SBig(reinterpret_cast<u32*>(x110_mreaSecBufs[1].first.get())[i]);

        AllocNewAreaData(x128_mreaDataOffset, totalSz);

        m_resolvedBufs.reserve(secCount);
        m_resolvedBufs.emplace_back(x110_mreaSecBufs[0].first.get(), x110_mreaSecBufs[0].second);
        m_resolvedBufs.emplace_back(x110_mreaSecBufs[1].first.get(), x110_mreaSecBufs[1].second);

        u32 curOff = 0;
        for (u32 i=0 ; i<secCount ; ++i)
        {
            u32 size = hecl::SBig(reinterpret_cast<u32*>(x110_mreaSecBufs[1].first.get())[i]);
            m_resolvedBufs.emplace_back(x110_mreaSecBufs[2].first.get() + curOff, size);
            curOff += size;
        }

        xf4_phase = EPhase::WaitForFinish;
        break;
    }
    case EPhase::WaitForFinish:
    {
        CullDeadAreaRequests();
        if (xf8_loadTransactions.size())
            break;
        return false;
    }
    default: break;
    }

    return true;
}

void CGameArea::ReloadAllUnloadedTextures()
{
}

void CGameArea::PrepTokens()
{

}

u32 CGameArea::GetNumPartSizes() const
{
    return hecl::SBig(*reinterpret_cast<u32*>(x110_mreaSecBufs[0].first.get() + 60));
}

void CGameArea::AllocNewAreaData(int offset, int size)
{
    x110_mreaSecBufs.emplace_back(std::unique_ptr<u8[]>(new u8[size]), size);
    xf8_loadTransactions.push_back(g_ResFactory->
        LoadResourcePartAsync(SObjectTag{FOURCC('MREA'), x84_mrea}, size, offset,
                              x110_mreaSecBufs.back().first.get()));
}

bool CGameArea::Invalidate(CStateManager& mgr)
{
    return false;
}

void CGameArea::CullDeadAreaRequests()
{
    for (auto it = xf8_loadTransactions.begin() ; it != xf8_loadTransactions.end() ;)
    {
        if ((*it)->IsComplete())
        {
            it = xf8_loadTransactions.erase(it);
            continue;
        }
        ++it;
    }
}

void CGameArea::StartStreamIn(CStateManager& mgr)
{
    if (xf0_24_postConstructed || xf0_27_paused)
        return;

    VerifyTokenList(mgr);

    if (!xf0_26_tokensReady)
    {
        u32 notLoaded = 0;
        for (CToken& tok : xdc_tokens)
        {
            tok.Lock();
            if (!tok.IsLoaded())
                ++notLoaded;
        }
        if (notLoaded)
            return;
        xf0_26_tokensReady = true;
    }

    StartStreamingMainArea();
    if (xf4_phase != EPhase::WaitForFinish)
        return;
    CullDeadAreaRequests();
    if (xf8_loadTransactions.size())
        return;
    Validate(mgr);
}

void CGameArea::Validate(CStateManager& mgr)
{
    if (xf0_24_postConstructed)
        return;

    while (StartStreamingMainArea()) {}

    for (auto& req : xf8_loadTransactions)
        req->WaitUntilComplete();

    if (xdc_tokens.empty())
    {
        VerifyTokenList(mgr);
        for (CToken& tok : xdc_tokens)
            tok.Lock();
        for (CToken& tok : xdc_tokens)
            tok.GetObj();
        xf0_26_tokensReady = true;
    }

    xf8_loadTransactions.clear();

    PostConstructArea();
    if (x4_selfIdx != kInvalidAreaId)
        mgr.WorldNC()->MoveAreaToChain3(x4_selfIdx);

    LoadScriptObjects(mgr);

    CPVSAreaSet* pvs = x12c_postConstructed->xa0_pvs.get();
    if (pvs && x12c_postConstructed->x1108_29_)
    {
        for (int i=0 ; i<pvs->GetNumActors() ; ++i)
        {
            TEditorId entId = pvs->GetEntityIdByIndex(i) | (x4_selfIdx << 16);
            TUniqueId id = mgr.GetIdForScript(entId);
            if (id != kInvalidUniqueId)
            {
                CPostConstructed::MapEntry& ent = x12c_postConstructed->xa8_pvsEntityMap[id.Value()];
                ent.x0_id = i + (pvs->GetNumFeatures() - pvs->GetNumActors());
                ent.x4_uid = id;
            }
        }
    }

    xf0_28_validated = true;
    mgr.AreaLoaded(x4_selfIdx);
}

void CGameArea::LoadScriptObjects(CStateManager& mgr)
{
    CWorldLayerState& layerState = *mgr.LayerState();
    u32 layerCount = layerState.GetAreaLayerCount(x4_selfIdx);
    std::vector<TEditorId> objIds;
    for (u32 i=0 ; i<layerCount ; ++i)
    {
        if (layerState.IsLayerActive(x4_selfIdx, i))
        {
            auto layerBuf = GetLayerScriptBuffer(i);
            CMemoryInStream r(layerBuf.first, layerBuf.second);
            mgr.LoadScriptObjects(x4_selfIdx, r, objIds);
        }
    }
    mgr.InitScriptObjects(objIds);
}

std::pair<const u8*, u32> CGameArea::GetLayerScriptBuffer(int layer)
{
    if (!xf0_24_postConstructed)
        return {};
    return x12c_postConstructed->x110c_layerPtrs[layer];
}

void CGameArea::PostConstructArea()
{
    MREAHeader header = VerifyHeader();

    auto secIt = m_resolvedBufs.begin() + 2;

    /* Materials */
    ++secIt;

    u32 sec = 3;

    /* Models */
    x12c_postConstructed->x4c_insts.resize(header.modelCount);
    for (u32 i=0 ; i<header.modelCount ; ++i)
    {
        u32 surfCount = hecl::SBig(*reinterpret_cast<const u32*>((secIt+4)->first));
        secIt += 5 + surfCount;
        sec += 5 + surfCount;
    }

    /* Render octree */
    if (header.version == 15 && header.arotSecIdx != -1)
    {
        x12c_postConstructed->xc_octTree.emplace(secIt->first);
        ++secIt;
    }

    /* Scriptable layer section */
    x12c_postConstructed->x10c8_sclyBuf = secIt->first;
    x12c_postConstructed->x10d0_sclySize = secIt->second;
    ++secIt;

    /* Collision section */
    std::unique_ptr<CAreaOctTree> collision = CAreaOctTree::MakeFromMemory(secIt->first, secIt->second);
    if (collision)
    {
        x12c_postConstructed->x0_collision = std::move(collision);
        x12c_postConstructed->x8_collisionSize = secIt->second;
    }
    ++secIt;

    /* Unknown section */
    ++secIt;

    /* Lights section */
    if (header.version > 6)
    {
        athena::io::MemoryReader r(secIt->first, secIt->second);
        u32 magic = r.readUint32Big();
        if (magic == 0xBABEDEAD)
        {
            u32 aCount = r.readUint32Big();
            x12c_postConstructed->x60_lightsA.reserve(aCount);
            x12c_postConstructed->x70_gfxLightsA.reserve(aCount);
            for (u32 i=0 ; i<aCount ; ++i)
            {
                x12c_postConstructed->x60_lightsA.emplace_back(r);
                x12c_postConstructed->x70_gfxLightsA.push_back(
                    x12c_postConstructed->x60_lightsA.back().GetAsCGraphicsLight());
            }

            u32 bCount = r.readUint32Big();
            x12c_postConstructed->x80_lightsB.reserve(bCount);
            x12c_postConstructed->x90_gfxLightsB.reserve(bCount);
            for (u32 i=0 ; i<bCount ; ++i)
            {
                x12c_postConstructed->x80_lightsB.emplace_back(r);
                x12c_postConstructed->x90_gfxLightsB.push_back(
                    x12c_postConstructed->x80_lightsB.back().GetAsCGraphicsLight());
            }
        }

        ++secIt;
    }

    /* PVS section */
    if (header.version > 7)
    {
        athena::io::MemoryReader r(secIt->first, secIt->second);
        u32 magic = r.readUint32Big();
        if (magic == 'VISI')
        {
            x12c_postConstructed->x10a8_pvsVersion = r.readUint32Big();
            if (x12c_postConstructed->x10a8_pvsVersion == 2)
            {
                x12c_postConstructed->x1108_29_ = r.readBool();
                x12c_postConstructed->x1108_30_ = r.readBool();
                x12c_postConstructed->xa0_pvs = std::make_unique<CPVSAreaSet>(secIt->first + r.position(),
                                                                              secIt->second - r.position());
            }
        }

        ++secIt;
    }

    /* Pathfinding section */
    if (header.version > 9)
    {
        athena::io::MemoryReader r(secIt->first, secIt->second);
        CAssetId pathId = r.readUint32Big();
        x12c_postConstructed->x10ac_path = g_SimplePool->GetObj(SObjectTag{FOURCC('PATH'), pathId});
        ++secIt;
    }

    x12c_postConstructed->x10c0_areaObjs.reset(new CAreaObjectList(x4_selfIdx));
    x12c_postConstructed->x10c4_areaFog.reset(new CAreaFog());

    xf0_24_postConstructed = true;

    /* Resolve layer pointers */
    if (x12c_postConstructed->x10c8_sclyBuf)
    {
        athena::io::MemoryReader r(x12c_postConstructed->x10c8_sclyBuf, x12c_postConstructed->x10d0_sclySize);
        u32 magic = r.readUint32Big();
        if (magic == 'SCLY')
        {
            r.readUint32Big();
            u32 layerCount = r.readUint32Big();
            x12c_postConstructed->x110c_layerPtrs.resize(layerCount);
            for (u32 l=0 ; l<layerCount ; ++l)
                x12c_postConstructed->x110c_layerPtrs[l].second = r.readUint32Big();
            const u8* ptr = x12c_postConstructed->x10c8_sclyBuf + r.position();
            for (u32 l=0 ; l<layerCount ; ++l)
            {
                x12c_postConstructed->x110c_layerPtrs[l].first = ptr;
                ptr += x12c_postConstructed->x110c_layerPtrs[l].second;
            }
        }
    }
}

void CGameArea::FillInStaticGeometry(bool textures)
{
    if (!x12c_postConstructed->x4c_insts.empty())
        for (CMetroidModelInstance& inst : x12c_postConstructed->x4c_insts)
            inst.Clear();

    /* Materials */
    CBooModel::SShader& matSet = x12c_postConstructed->m_materialSet;
    auto secIt = m_resolvedBufs.begin() + 2;
    {
        athena::io::MemoryReader r(secIt->first, secIt->second);
        matSet.m_matSet.read(r);
        if (textures)
            CBooModel::MakeTexturesFromMats(matSet.m_matSet, matSet.x0_textures, *g_SimplePool);
        ++secIt;
    }

    CGraphics::CommitResources([&](boo::IGraphicsDataFactory::Context& ctx) -> bool
    {
        /* Models */
        for (CMetroidModelInstance& inst : x12c_postConstructed->x4c_insts)
        {
            {
                DataSpec::DNAMP1::MREA::MeshHeader header;
                athena::io::MemoryReader r(secIt->first, secIt->second);
                header.read(r);
                inst.x0_visorFlags = header.visorFlags.flags;
                inst.x4_xf = header.xfMtx;
                inst.x34_aabb = zeus::CAABox(header.aabb[0], header.aabb[1]);
                ++secIt;
            }

            {
                athena::io::MemoryReader r(secIt->first, secIt->second);
                inst.m_hmdlMeta.read(r);
            }
            ++secIt;

            boo::ObjToken<boo::IGraphicsBufferS> vbo;
            boo::ObjToken<boo::IGraphicsBufferS> ibo;
            boo::ObjToken<boo::IVertexFormat> vtxFmt;
            vbo = ctx.newStaticBuffer(boo::BufferUse::Vertex, secIt->first, inst.m_hmdlMeta.vertStride,
                                      inst.m_hmdlMeta.vertCount);
            ++secIt;
            ibo = ctx.newStaticBuffer(boo::BufferUse::Index, secIt->first, 4, inst.m_hmdlMeta.indexCount);
            ++secIt;
            vtxFmt = hecl::Runtime::HMDLData::NewVertexFormat(ctx, inst.m_hmdlMeta, vbo.get(), ibo.get());

            u32 surfCount = hecl::SBig(*reinterpret_cast<const u32*>(secIt->first));
            inst.m_surfaces.reserve(surfCount);
            inst.m_shaders.resize(matSet.m_matSet.materials.size());
            ++secIt;
            for (u32 j=0 ; j<surfCount ; ++j)
            {
                inst.m_surfaces.emplace_back();
                CBooSurface& surf = inst.m_surfaces.back();
                surf.selfIdx = j;
                athena::io::MemoryReader r(secIt->first, secIt->second);
                surf.m_data.read(r);
                ++secIt;
            }

            TToken<CModel> nullModel;
            inst.m_instance = std::make_unique<CBooModel>
                (nullModel, nullptr, &inst.m_surfaces, matSet, vtxFmt, vbo, ibo,
                 inst.x34_aabb, inst.x0_visorFlags, 0, nullptr);
        }

        return true;
    });

    for (CMetroidModelInstance& inst : x12c_postConstructed->x4c_insts)
    {
        for (CBooSurface& surf : inst.m_surfaces)
        {
            auto& shad = inst.m_shaders[surf.m_data.matIdx];
            if (!shad)
                shad = matSet.BuildShader(inst.m_hmdlMeta, matSet.m_matSet.materials[surf.m_data.matIdx]);
        }
        inst.m_instance->RemapMaterialData(matSet, inst.m_shaders);
    }

    x12c_postConstructed->x1108_25_modelsConstructed = true;
}

void CGameArea::VerifyTokenList(CStateManager& stateMgr)
{
    if (xdc_tokens.size())
        return;
    ClearTokenList();

    if (xac_deps2.empty())
        return;

    u32 lastOff = 0;
    int lidx = 0;
    for (u32 off : xbc_layerDepOffsets)
    {
        if (stateMgr.LayerState()->IsLayerActive(x4_selfIdx, lidx))
        {
            auto it = xac_deps2.begin() + lastOff;
            auto end = xac_deps2.begin() + off;
            for (; it != end ; ++it)
            {
                xdc_tokens.push_back(g_SimplePool->GetObj(*it));
                xdc_tokens.back().Lock();
            }
        }
        lastOff = off;
        ++lidx;
    }
}

void CGameArea::ClearTokenList()
{
    if (xdc_tokens.empty())
        xdc_tokens.reserve(xac_deps2.size());
    else
        xdc_tokens.clear();

    xf0_26_tokensReady = false;
}

u32 CGameArea::GetPreConstructedSize() const
{
    return 0;
}

CGameArea::MREAHeader CGameArea::VerifyHeader() const
{
    if (x110_mreaSecBufs.empty())
        return {};
    if (*reinterpret_cast<u32*>(x110_mreaSecBufs[0].first.get()) != SBIG(0xDEADBEEF))
        return {};

    MREAHeader header;
    athena::io::MemoryReader r(x110_mreaSecBufs[0].first.get() + 4, x110_mreaSecBufs[0].second - 4);
    u32 version = r.readUint32Big();
    if (!(version & 0x10000))
        Log.report(logvisor::Fatal, "Attempted to load non-URDE MREA");
    version &= ~0x10000;
    header.version = (version >= 12 && version <= 15) ? version : 0;
    if (!header.version)
        return {};

    header.xf.read34RowMajor(r);
    header.modelCount = r.readUint32Big();
    header.secCount = r.readUint32Big();
    header.geomSecIdx = r.readUint32Big();
    header.sclySecIdx = r.readUint32Big();
    header.collisionSecIdx = r.readUint32Big();
    header.unkSecIdx = r.readUint32Big();
    header.lightSecIdx = r.readUint32Big();
    header.visiSecIdx = r.readUint32Big();
    header.pathSecIdx = r.readUint32Big();
    header.arotSecIdx = r.readUint32Big();

    return header;
}

TUniqueId CGameArea::LookupPVSUniqueID(TUniqueId id) const
{
    return x12c_postConstructed->xa8_pvsEntityMap[id.Value()].x4_uid;
}

s16 CGameArea::LookupPVSID(TUniqueId id) const
{
    return x12c_postConstructed->xa8_pvsEntityMap[id.Value()].x0_id;
}

void CGameArea::SetAreaAttributes(const CScriptAreaAttributes* areaAttributes)
{
    x12c_postConstructed->x10d8_areaAttributes = areaAttributes;
    if (areaAttributes == nullptr)
        return;

    x12c_postConstructed->x111c_thermalCurrent = areaAttributes->GetThermalHeat();
    x12c_postConstructed->x1128_worldLightingLevel = areaAttributes->GetWorldLightingLevel();
}

bool CGameArea::CAreaObjectList::IsQualified(const CEntity& ent)
{
    return (ent.GetAreaIdAlways() == x200c_areaIdx);
}
void CGameArea::WarmupShaders(const SObjectTag& mreaTag)
{
    // Calling this version of the constructor performs warmup implicitly
    CGameArea area(mreaTag.id);
}

}