#include <athena/FileWriter.hpp>
#include "MREA.hpp"
#include "../DNAMP2/DeafBabe.hpp"
#include "../DNACommon/BabeDead.hpp"

namespace DataSpec
{
namespace DNAMP3
{

MREA::StreamReader::StreamReader(athena::io::IStreamReader& source,
                                 atUint32 blkCount, atUint32 secIdxCount)
: DNAMP2::MREA::StreamReader(source)
{
    m_blkCount = blkCount;
    m_blockInfos.reserve(blkCount);
    for (atUint32 i=0 ; i<blkCount ; ++i)
    {
        m_blockInfos.emplace_back();
        BlockInfo& info = m_blockInfos.back();
        info.read(source);
        m_totalDecompLen += info.decompSize;
    }
    source.seekAlign32();
    m_secIdxs.reserve(secIdxCount);
    for (atUint32 i=0 ; i<secIdxCount ; ++i)
    {
        m_secIdxs.emplace_back();
        std::pair<DNAFourCC, atUint32>& idx = m_secIdxs.back();
        idx.first.read(source);
        idx.second = source.readUint32Big();
    }
    source.seekAlign32();
    m_blkBase = source.position();
    nextBlock();
}

void MREA::StreamReader::writeSecIdxs(athena::io::IStreamWriter& writer) const
{
    for (const std::pair<DNAFourCC, atUint32>& idx : m_secIdxs)
    {
        idx.first.write(writer);
        writer.writeUint32Big(idx.second);
    }
}

void MREA::ReadBabeDeadToBlender_3(hecl::BlenderConnection::PyOutStream& os,
                                   athena::io::IStreamReader& rs)
{
    atUint32 bdMagic = rs.readUint32Big();
    if (bdMagic != 0xBABEDEAD)
        Log.report(logvisor::Fatal, "invalid BABEDEAD magic");
    os << "bpy.context.scene.render.engine = 'CYCLES'\n"
          "bpy.context.scene.world.use_nodes = True\n"
          "bpy.context.scene.render.engine = 'BLENDER_GAME'\n"
          "bg_node = bpy.context.scene.world.node_tree.nodes['Background']\n";
    for (atUint32 s=0 ; s<4 ; ++s)
    {
        atUint32 lightCount = rs.readUint32Big();
        for (atUint32 l=0 ; l<lightCount ; ++l)
        {
            BabeDeadLight light;
            light.read(rs);
            ReadBabeDeadLightToBlender(os, light, s, l);
        }
    }
}

bool MREA::Extract(const SpecBase& dataSpec,
                   PAKEntryReadStream& rs,
                   const hecl::ProjectPath& outPath,
                   PAKRouter<PAKBridge>& pakRouter,
                   const PAK::Entry& entry,
                   bool force,
                   std::function<void(const hecl::SystemChar*)>)
{
    using RigPair = std::pair<CSKR*, CINF*>;
    RigPair dummy(nullptr, nullptr);

    /* Rename MREA for consistency */
    hecl::ProjectPath mreaPath(outPath.getParentPath(), _S("!area.blend"));
    if (!force && mreaPath.getPathType() == hecl::ProjectPath::Type::File)
        return true;

    /* Do extract */
    Header head;
    head.read(rs);
    rs.seekAlign32();

    /* MREA decompression stream */
    StreamReader drs(rs, head.compressedBlockCount, head.secIndexCount);
    athena::io::FileWriter mreaDecompOut(pakRouter.getCooked(&entry).getWithExtension(_S(".decomp")).getAbsolutePath());
    head.write(mreaDecompOut);
    mreaDecompOut.seekAlign32();
    drs.writeDecompInfos(mreaDecompOut);
    mreaDecompOut.seekAlign32();
    drs.writeSecIdxs(mreaDecompOut);
    mreaDecompOut.seekAlign32();
    atUint64 decompLen = drs.length();
    mreaDecompOut.writeBytes(drs.readBytes(decompLen).get(), decompLen);
    mreaDecompOut.close();
    drs.seek(0, athena::Begin);


    /* Start up blender connection */
    hecl::BlenderConnection& conn = hecl::BlenderConnection::SharedConnection();
    if (!conn.createBlend(mreaPath, hecl::BlenderConnection::BlendType::Area))
        return false;

    /* Open Py Stream and read sections */
    hecl::BlenderConnection::PyOutStream os = conn.beginPythonOut(true);
    os.format("import bpy\n"
              "import bmesh\n"
              "from mathutils import Vector\n"
              "\n"
              "bpy.context.scene.name = '%s'\n",
              pakRouter.getBestEntryName(entry).c_str());
    DNACMDL::InitGeomBlenderContext(os, dataSpec.getMasterShaderPath());
    MaterialSet::RegisterMaterialProps(os);
    os << "# Clear Scene\n"
          "for ob in bpy.data.objects:\n"
          "    bpy.context.scene.objects.unlink(ob)\n"
          "    bpy.data.objects.remove(ob)\n"
          "bpy.types.Lamp.retro_layer = bpy.props.IntProperty(name='Retro: Light Layer')\n"
          "bpy.types.Lamp.retro_origtype = bpy.props.IntProperty(name='Retro: Original Type')\n"
          "\n";

    /* One shared material set for all meshes */
    os << "# Materials\n"
          "materials = []\n"
          "\n";
    MaterialSet matSet;
    atUint64 secStart = drs.position();
    matSet.read(drs);
    matSet.readToBlender(os, pakRouter, entry, 0);
    drs.seek(secStart + head.secSizes[0], athena::Begin);
    std::vector<DNACMDL::VertexAttributes> vertAttribs;
    DNACMDL::GetVertexAttributes(matSet, vertAttribs);

    /* Read mesh info */
    atUint32 curSec = 1;
    std::vector<atUint32> surfaceCounts;
    surfaceCounts.reserve(head.meshCount);
    for (atUint32 m=0 ; m<head.meshCount ; ++m)
    {
        /* Mesh header */
        MeshHeader mHeader;
        secStart = drs.position();
        mHeader.read(drs);
        drs.seek(secStart + head.secSizes[curSec++], athena::Begin);

        /* Surface count from here */
        secStart = drs.position();
        surfaceCounts.push_back(drs.readUint32Big());
        drs.seek(secStart + head.secSizes[curSec++], athena::Begin);

        /* Seek through AROT-relation sections */
        drs.seek(head.secSizes[curSec++], athena::Current);
        drs.seek(head.secSizes[curSec++], athena::Current);
    }

    /* Skip though WOBJs */
    auto secIdxIt = drs.beginSecIdxs();
    while (secIdxIt->first == FOURCC('WOBJ'))
        ++secIdxIt;

    /* Skip AROT */
    if (secIdxIt->first == FOURCC('ROCT'))
    {
        drs.seek(head.secSizes[curSec++], athena::Current);
        ++secIdxIt;
    }

    /* Skip AABB */
    if (secIdxIt->first == FOURCC('AABB'))
    {
        drs.seek(head.secSizes[curSec++], athena::Current);
        ++secIdxIt;
    }

    /* Now the meshes themselves */
    if (secIdxIt->first == FOURCC('GPUD'))
    {
        for (atUint32 m=0 ; m<head.meshCount ; ++m)
        {
            curSec += DNACMDL::ReadGeomSectionsToBlender<PAKRouter<PAKBridge>, MaterialSet, RigPair, DNACMDL::SurfaceHeader_3>
                          (os, drs, pakRouter, entry, dummy, true,
                           false, vertAttribs, m, head.secCount, 0, &head.secSizes[curSec], surfaceCounts[m]);
        }
        ++secIdxIt;
    }

    /* Skip DEPS */
    if (secIdxIt->first == FOURCC('DEPS'))
    {
        drs.seek(head.secSizes[curSec++], athena::Current);
        ++secIdxIt;
    }

    /* Skip SOBJ (SCLY) */
    if (secIdxIt->first == FOURCC('SOBJ'))
    {
        for (atUint32 l=0 ; l<head.sclyLayerCount ; ++l)
            drs.seek(head.secSizes[curSec++], athena::Current);
        ++secIdxIt;
    }

    /* Skip SGEN */
    if (secIdxIt->first == FOURCC('SGEN'))
    {
        drs.seek(head.secSizes[curSec++], athena::Current);
        ++secIdxIt;
    }

    /* Read Collision Meshes */
    if (secIdxIt->first == FOURCC('COLI'))
    {
        DNAMP2::DeafBabe collision;
        secStart = drs.position();
        collision.read(drs);
        DNAMP2::DeafBabe::BlenderInit(os);
        collision.sendToBlender(os);
        drs.seek(secStart + head.secSizes[curSec++], athena::Begin);
        ++secIdxIt;
    }

    /* Read BABEDEAD Lights as Cycles emissives */
    if (secIdxIt->first == FOURCC('LITE'))
    {
        secStart = drs.position();
        ReadBabeDeadToBlender_3(os, drs);
        drs.seek(secStart + head.secSizes[curSec++], athena::Begin);
        ++secIdxIt;
    }

    /* Origins to center of mass */
    os << "bpy.context.scene.layers[1] = True\n"
          "bpy.ops.object.select_by_type(type='MESH')\n"
          "bpy.ops.object.origin_set(type='ORIGIN_CENTER_OF_MASS')\n"
          "bpy.ops.object.select_all(action='DESELECT')\n"
          "bpy.context.scene.layers[1] = False\n";

    os.centerView();
    os.close();
    return conn.saveBlend();
}

bool MREA::ExtractLayerDeps(PAKEntryReadStream& rs, PAKBridge::Level::Area& areaOut)
{
    /* Do extract */
    Header head;
    head.read(rs);
    rs.seekAlign32();

    /* MREA decompression stream */
    StreamReader drs(rs, head.compressedBlockCount, head.secIndexCount);
    for (const std::pair<DNAFourCC, atUint32>& idx : drs.m_secIdxs)
    {
        if (idx.first == FOURCC('DEPS'))
        {
            drs.seek(head.getSecOffset(idx.second), athena::Begin);
            DEPS deps;
            deps.read(drs);

            unsigned r=0;
            for (unsigned l=1 ; l<deps.depLayerCount ; ++l)
            {
                if (l > areaOut.layers.size())
                    break;
                PAKBridge::Level::Area::Layer& layer = areaOut.layers.at(l-1);
                layer.resources.reserve(deps.depLayers[l] - r);
                for (; r<deps.depLayers[l] ; ++r)
                    layer.resources.emplace(deps.deps[r].id);
            }
            areaOut.resources.reserve(deps.depCount - r + 2);
            for (; r<deps.depCount ; ++r)
                areaOut.resources.emplace(deps.deps[r].id);

            return true;
        }
    }
    return false;
}

}
}