/*

Open Asset Import Library (assimp)

----------------------------------------------------------------------

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  copyright notice, this list of conditions and the

  following disclaimer.

* Redistributions in binary form must reproduce the above

  copyright notice, this list of conditions and the

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*/

/** @file Declaration of the LWO importer class. */

#pragma once

#ifndef AI_LWOLOADER_H_INCLUDED

#define AI_LWOLOADER_H_INCLUDED

#include "LWOFileData.h"

#include <assimp/BaseImporter.h>

#include <assimp/material.h>

#include <assimp/DefaultLogger.hpp>

#include <map>

struct aiTexture;

struct aiNode;

struct aiMaterial;

namespace Assimp {

using namespace LWO;

// ---------------------------------------------------------------------------

/** Class to load LWO files.

 *

 *  @note  Methods named "xxxLWO2[xxx]" are used with the newer LWO2 format.

 *         Methods named "xxxLWOB[xxx]" are used with the older LWOB format.

 *         Methods named "xxxLWO[xxx]" are used with both formats.

 *         Methods named "xxx" are used to preprocess the loaded data -

 *         they aren't specific to one format version

*/

// ---------------------------------------------------------------------------

class LWOImporter : public BaseImporter {

public:

    LWOImporter();

    ~LWOImporter() override;

    // -------------------------------------------------------------------

    /** Returns whether the class can handle the format of the given file.

     * See BaseImporter::CanRead() for details.

     */

    bool CanRead(const std::string &pFile, IOSystem *pIOHandler,

            bool checkSig) const override;

    // -------------------------------------------------------------------

    /** Called prior to ReadFile().

    * The function is a request to the importer to update its configuration

    * basing on the Importer's configuration property list.

    */

    void SetupProperties(const Importer *pImp) override;

protected:

    // -------------------------------------------------------------------

    // Get list of supported extensions

    const aiImporterDesc *GetInfo() const override;

    // -------------------------------------------------------------------

    /** Imports the given file into the given scene structure.

    * See BaseImporter::InternReadFile() for details

    */

    void InternReadFile(const std::string &pFile, aiScene *pScene,

            IOSystem *pIOHandler) override;

private:

    // -------------------------------------------------------------------

    /** Loads a LWO file in the older LWOB format (LW < 6)

     */

    void LoadLWOBFile();

    // -------------------------------------------------------------------

    /** Loads a LWO file in the newer LWO2 format (LW >= 6)

     */

    void LoadLWO2File();

    // -------------------------------------------------------------------

    /** Parsing functions used for all file format versions

    */

    inline void GetS0(std::string &out, unsigned int max);

    inline float GetF4();

    inline float GetF8();

    inline uint64_t GetU8();

    inline uint32_t GetU4();

    inline uint16_t GetU2();

    inline uint8_t GetU1();

    // -------------------------------------------------------------------

    /** Loads a surface chunk from an LWOB file

     *  @param size Maximum size to be read, in bytes.

     */

    void LoadLWOBSurface(unsigned int size);

    // -------------------------------------------------------------------

    /** Loads a surface chunk from an LWO2 file

     *  @param size Maximum size to be read, in bytes.

     */

    void LoadLWO2Surface(unsigned int size);

    void LoadLWO3Surface(unsigned int size);

    // -------------------------------------------------------------------

    /** Loads a texture block from a LWO2 file.

     *  @param size Maximum size to be read, in bytes.

     *  @param head Header of the SUF.BLOK header

     */

    void LoadLWO2TextureBlock(LE_NCONST IFF::SubChunkHeader *head,

            unsigned int size);

    // -------------------------------------------------------------------

    /** Loads a shader block from a LWO2 file.

     *  @param size Maximum size to be read, in bytes.

     *  @param head Header of the SUF.BLOK header

     */

    void LoadLWO2ShaderBlock(LE_NCONST IFF::SubChunkHeader *head,

            unsigned int size);

    // -------------------------------------------------------------------

    /** Loads an image map from a LWO2 file

     *  @param size Maximum size to be read, in bytes.

     *  @param tex Texture object to be filled

     */

    void LoadLWO2ImageMap(unsigned int size, LWO::Texture &tex);

    void LoadLWO2Gradient(unsigned int size, LWO::Texture &tex);

    void LoadLWO2Procedural(unsigned int size, LWO::Texture &tex);

    // loads the header - used by thethree functions above

    void LoadLWO2TextureHeader(unsigned int size, LWO::Texture &tex);

    // -------------------------------------------------------------------

    /** Loads the LWO tag list from the file

     *  @param size Maximum size to be read, in bytes.

     */

    void LoadLWOTags(unsigned int size);

    // -------------------------------------------------------------------

    /** Load polygons from a POLS chunk

     *  @param length Size of the chunk

    */

    void LoadLWO2Polygons(unsigned int length);

    void LoadLWOBPolygons(unsigned int length);

    // -------------------------------------------------------------------

    /** Load polygon tags from a PTAG chunk

     *  @param length Size of the chunk

    */

    void LoadLWO2PolygonTags(unsigned int length);

    // -------------------------------------------------------------------

    /** Load a vertex map from a VMAP/VMAD chunk

     *  @param length Size of the chunk

     *  @param perPoly Operate on per-polygon base?

    */

    void LoadLWO2VertexMap(unsigned int length, bool perPoly);

    // -------------------------------------------------------------------

    /** Load polygons from a PNTS chunk

     *  @param length Size of the chunk

    */

    void LoadLWOPoints(unsigned int length);

    // -------------------------------------------------------------------

    /** Load a clip from a CLIP chunk

     *  @param length Size of the chunk

    */

    void LoadLWO2Clip(unsigned int length);

    void LoadLWO3Clip(unsigned int length);

    // -------------------------------------------------------------------

    /** Load an envelope from an EVL chunk

     *  @param length Size of the chunk

    */

    void LoadLWO2Envelope(unsigned int length);

    void LoadLWO3Envelope(unsigned int length);

    // -------------------------------------------------------------------

    /** Load an nodal blocks from surface form

     *  @param length Size of the chunk

    */

    void LoadNodalBlocks(unsigned int length);

    void LoadNodes(unsigned int length);

    void LoadNodeTag(unsigned int length);

    void LoadNodeData(unsigned int length);

    // -------------------------------------------------------------------

    /** Count vertices and faces in a LWOB/LWO2 file

    */

    void CountVertsAndFacesLWO2(unsigned int &verts,

            unsigned int &faces,

            uint16_t *&cursor,

            const uint16_t *const end,

            unsigned int max = UINT_MAX);

    void CountVertsAndFacesLWOB(unsigned int &verts,

            unsigned int &faces,

            LE_NCONST uint16_t *&cursor,

            const uint16_t *const end,

            unsigned int max = UINT_MAX);

    // -------------------------------------------------------------------

    /** Read vertices and faces in a LWOB/LWO2 file

    */

    void CopyFaceIndicesLWO2(LWO::FaceList::iterator &it,

            uint16_t *&cursor,

            const uint16_t *const end);

    // -------------------------------------------------------------------

    void CopyFaceIndicesLWOB(LWO::FaceList::iterator &it,

            LE_NCONST uint16_t *&cursor,

            const uint16_t *const end,

            unsigned int max = UINT_MAX);

    // -------------------------------------------------------------------

    /** Resolve the tag and surface lists that have been loaded.

    *   Generates the mMapping table.

    */

    void ResolveTags();

    // -------------------------------------------------------------------

    /** Resolve the clip list that has been loaded.

    *   Replaces clip references with real clips.

    */

    void ResolveClips();

    // -------------------------------------------------------------------

    /** Add a texture list to an output material description.

     *

     *  @param pcMat Output material

     *  @param in Input texture list

     *  @param type Type identifier of the texture list

    */

    bool HandleTextures(aiMaterial *pcMat, const TextureList &in,

            aiTextureType type);

    // -------------------------------------------------------------------

    /** Adjust a texture path

    */

    void AdjustTexturePath(std::string &out);

    // -------------------------------------------------------------------

    /** Convert a LWO surface description to an ASSIMP material

    */

    void ConvertMaterial(const LWO::Surface &surf, aiMaterial *pcMat);

    // -------------------------------------------------------------------

    /** Get a list of all UV/VC channels required by a specific surface.

     *

     *  @param surf Working surface

     *  @param layer Working layer

     *  @param out Output list. The members are indices into the

     *    UV/VC channel lists of the layer

    */

    void FindUVChannels(/*const*/ LWO::Surface &surf,

            LWO::SortedRep &sorted,

            /*const*/ LWO::Layer &layer,

            unsigned int out[AI_MAX_NUMBER_OF_TEXTURECOORDS]);

    // -------------------------------------------------------------------

    char FindUVChannels(LWO::TextureList &list,

            LWO::Layer &layer, LWO::UVChannel &uv, unsigned int next);

    // -------------------------------------------------------------------

    void FindVCChannels(const LWO::Surface &surf,

            LWO::SortedRep &sorted,

            const LWO::Layer &layer,

            unsigned int out[AI_MAX_NUMBER_OF_COLOR_SETS]);

    // -------------------------------------------------------------------

    /** Generate the final node graph

     *  Unused nodes are deleted.

     *  @param apcNodes Flat list of nodes

    */

    void GenerateNodeGraph(std::map<uint16_t, aiNode *> &apcNodes);

    // -------------------------------------------------------------------

    /** Add children to a node

     *  @param node Node to become a father

     *  @param parent Index of the node

     *  @param apcNodes Flat list of nodes - used nodes are set to nullptr.

    */

    void AddChildren(aiNode *node, uint16_t parent,

            std::vector<aiNode *> &apcNodes);

    // -------------------------------------------------------------------

    /** Read a variable sized integer

     *  @param inout Input and output buffer

    */

    int ReadVSizedIntLWO2(uint8_t *&inout);

    // -------------------------------------------------------------------

    /** Assign a value from a VMAP to a vertex and all vertices

     *  attached to it.

     *  @param base VMAP destination data

     *  @param numRead Number of float's to be read

     *  @param idx Absolute index of the first vertex

     *  @param data Value of the VMAP to be assigned - read numRead

     *    floats from this array.

    */

    void DoRecursiveVMAPAssignment(VMapEntry *base, unsigned int numRead,

            unsigned int idx, float *data);

    // -------------------------------------------------------------------

    /** Compute normal vectors for a mesh

     *  @param mesh Input mesh

     *  @param smoothingGroups Smoothing-groups-per-face array

     *  @param surface Surface for the mesh

    */

    void ComputeNormals(aiMesh *mesh, const std::vector<unsigned int> &smoothingGroups,

            const LWO::Surface &surface);

    // -------------------------------------------------------------------

    /** Setup a new texture after the corresponding chunk was

     *  encountered in the file.

     *  @param list Texture list

     *  @param size Maximum number of bytes to be read

     *  @return Pointer to new texture

    */

    LWO::Texture *SetupNewTextureLWOB(LWO::TextureList &list,

            unsigned int size);

protected:

    /** true if the file is a LWO2 file*/

    bool mIsLWO2;

    /** true if the file is a LXOB file*/

    bool mIsLXOB;

    bool mIsLWO3;

    /** Temporary list of layers from the file */

    LayerList *mLayers;

    /** Pointer to the current layer */

    LWO::Layer *mCurLayer;

    /** Temporary tag list from the file */

    TagList *mTags;

    /** Mapping table to convert from tag to surface indices.

        UINT_MAX indicates that a no corresponding surface is available */

    TagMappingTable *mMapping;

    /** Temporary surface list from the file */

    SurfaceList *mSurfaces;

    /** Temporary clip list from the file */

    ClipList mClips;

    /** Temporary envelope list from the file */

    EnvelopeList mEnvelopes;

    /** file buffer */

    uint8_t *mFileBuffer;

    /** Size of the file, in bytes */

    unsigned int fileSize;

    /** Output scene */

    aiScene *mScene;

    /** Configuration option: speed flag set? */

    bool configSpeedFlag;

    /** Configuration option: index of layer to be loaded */

    unsigned int configLayerIndex;

    /** Configuration option: name of layer to be loaded */

    std::string configLayerName;

    /** True if we have a named layer */

    bool hasNamedLayer;

};

// ------------------------------------------------------------------------------------------------

inline float LWOImporter::GetF4() {

    float f;

    ::memcpy(&f, mFileBuffer, 4);

    mFileBuffer += 4;

    AI_LSWAP4(f);

    return f;

}

inline float LWOImporter::GetF8() {

    double f;

    ::memcpy(&f, mFileBuffer, 8);

    mFileBuffer += 8;

    AI_LSWAP8(f);

    return (float)f;

}

inline uint64_t LWOImporter::GetU8() {

    uint64_t f;

    ::memcpy(&f, mFileBuffer, 8);

    mFileBuffer += 8;

    AI_LSWAP8(f);

    return f;

}

// ------------------------------------------------------------------------------------------------

inline uint32_t LWOImporter::GetU4() {

    uint32_t f;

    ::memcpy(&f, mFileBuffer, 4);

    mFileBuffer += 4;

    AI_LSWAP4(f);

    return f;

}

// ------------------------------------------------------------------------------------------------

inline uint16_t LWOImporter::GetU2() {

    uint16_t f;

    ::memcpy(&f, mFileBuffer, 2);

    mFileBuffer += 2;

    AI_LSWAP2(f);

    return f;

}

// ------------------------------------------------------------------------------------------------

inline uint8_t LWOImporter::GetU1() {

    return *mFileBuffer++;

}

// ------------------------------------------------------------------------------------------------

inline int LWOImporter::ReadVSizedIntLWO2(uint8_t *&inout) {

    int i;

    int c = *inout;

    inout++;

    if (c != 0xFF) {

        i = c << 8;

        c = *inout;

        inout++;

        i |= c;

    } else {

        c = *inout;

        inout++;

        i = c << 16;

        c = *inout;

        inout++;

        i |= c << 8;

        c = *inout;

        inout++;

        i |= c;

    }

    return i;

}

// ------------------------------------------------------------------------------------------------

inline void LWOImporter::GetS0(std::string &out, unsigned int max) {

    unsigned int iCursor = 0;

    const char *sz = (const char *)mFileBuffer;

    while (*mFileBuffer) {

        if (++iCursor > max) {

            ASSIMP_LOG_WARN("LWO: Invalid file, string is is too long");

            break;

        }

        ++mFileBuffer;

    }

    size_t len = (size_t)((const char *)mFileBuffer - sz);

    out = std::string(sz, len);

    mFileBuffer += (len & 0x1 ? 1 : 2);

}

} // end of namespace Assimp

#endif // AI_LWOIMPORTER_H_INCLUDED