/*
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
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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
