/*

Open Asset Import Library (assimp)

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

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All rights reserved.

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with or without modification, are permitted provided that the

following conditions are met:

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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

  following disclaimer in the documentation and/or other

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* Neither the name of the assimp team, nor the names of its

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  derived from this software without specific prior

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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

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

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*/

/** @file  SMDLoader.h

 *  @brief Definition of the Valve SMD file format

 */

#pragma once

#ifndef AI_SMDLOADER_H_INCLUDED

#define AI_SMDLOADER_H_INCLUDED

#include <assimp/BaseImporter.h>

#include <assimp/ParsingUtils.h>

#include <assimp/types.h>

#include <assimp/texture.h>

#include <assimp/anim.h>

#include <assimp/material.h>

#include <vector>

struct aiNode;

namespace Assimp {

namespace SMD {

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

/** Data structure for a vertex in a SMD file

*/

struct Vertex {

    Vertex() AI_NO_EXCEPT : iParentNode(UINT_MAX) {

        // empty

    }

    //! Vertex position, normal and texture coordinate

    aiVector3D pos,nor,uv;

    //! Vertex parent node

    unsigned int iParentNode;

    //! Links to bones: pair.first is the bone index,

    //! pair.second is the vertex weight.

    //! WARN: The remaining weight (to reach 1.0f) is assigned

    //! to the parent node/bone

    std::vector<std::pair<unsigned int, float> > aiBoneLinks;

};

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

/** Data structure for a face in a SMD file

*/

struct Face {

    Face() AI_NO_EXCEPT :

            iTexture(0x0) {

        // empty

    }

    //! Texture index for the face

    unsigned int iTexture;

    //! The three vertices of the face

    Vertex avVertices[3];

};

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

/** Data structure for a bone in a SMD file

*/

struct Bone {

    //! Default constructor

    Bone() AI_NO_EXCEPT : iParent(UINT_MAX), bIsUsed(false) {

        // empty

    }

    //! Name of the bone

    std::string mName;

    //! Parent of the bone

    uint32_t iParent;

    //! Animation of the bone

    struct Animation {

        //! Public default constructor

        Animation() AI_NO_EXCEPT : iFirstTimeKey() {

            asKeys.reserve(20);

        }

        //! Data structure for a matrix key

        struct MatrixKey {

            //! Matrix at this time

            aiMatrix4x4 matrix;

            //! Absolute transformation matrix

            aiMatrix4x4 matrixAbsolute;

            //! Position

            aiVector3D vPos;

            //! Rotation (euler angles)

            aiVector3D vRot;

            //! Current time. may be negative, this

            //! will be fixed later

            double dTime;

        };

        //! Index of the key with the smallest time value

        uint32_t iFirstTimeKey;

        //! Array of matrix keys

        std::vector<MatrixKey> asKeys;

    } sAnim;

    //! Offset matrix of the bone

    aiMatrix4x4 mOffsetMatrix;

    //! true if the bone is referenced by at least one mesh

    bool bIsUsed;

};

} //! namespace SMD

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

/** Used to load Half-life 1 and 2 SMD models

*/

class ASSIMP_API SMDImporter : public BaseImporter {

public:

    SMDImporter();

    ~SMDImporter() override = default;

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

    /** 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:

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

    /** Return importer meta information.

     * See #BaseImporter::GetInfo for the details

     */

    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;

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

    /** Parse the SMD file and create the output scene

    */

    void ParseFile();

    void ReadSmd(const std::string &pFile, IOSystem* pIOHandler);

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

    /** Parse the triangles section of the SMD file

     * \param szCurrent Current position in the file. Points to the first

     * data line of the section.

     * \param szCurrentOut Receives a pointer to the heading line of

     * the next section (or to EOF)

    */

    void ParseTrianglesSection(const char* szCurrent,

            const char **szCurrentOut, const char *end);

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

    /** Parse the vertex animation section in VTA files

     * \param szCurrent Current position in the file. Points to the first

     * data line of the section.

     * \param szCurrentOut Receives a pointer to the heading line of

     * the next section (or to EOF)

    */

    void ParseVASection(const char* szCurrent,

            const char **szCurrentOu, const char *end);

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

    /** Parse the nodes section of the SMD file

     * \param szCurrent Current position in the file. Points to the first

     * data line of the section.

     * \param szCurrentOut Receives a pointer to the heading line of

     * the next section (or to EOF)

    */

    void ParseNodesSection(const char* szCurrent,

            const char **szCurrentOut, const char *end);

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

    /** Parse the skeleton section of the SMD file

     * \param szCurrent Current position in the file. Points to the first

     * data line of the section.

     * \param szCurrentOut Receives a pointer to the heading line of

     * the next section (or to EOF)

    */

    void ParseSkeletonSection(const char* szCurrent,

            const char **szCurrentOut, const char *end);

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

    /** Parse a single triangle in the SMD file

     * \param szCurrent Current position in the file. Points to the first

     * data line of the section.

     * \param szCurrentOut Receives the output cursor position

    */

    void ParseTriangle(const char* szCurrent,

            const char **szCurrentOut, const char *end);

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

    /** Parse a single vertex in the SMD file

     * \param szCurrent Current position in the file. Points to the first

     * data line of the section.

     * \param szCurrentOut Receives the output cursor position

     * \param vertex Vertex to be filled

    */

    void ParseVertex(const char* szCurrent,

            const char **szCurrentOut, const char *end, SMD::Vertex &vertex,

        bool bVASection = false);

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

    /** Get  the index of a texture. If the texture was not yet known

     *  it will be added to the internal texture list.

     * \param filename Name of the texture

     * \return Value texture index

     */

    unsigned int GetTextureIndex(const std::string& filename);

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

    /** Parse a line in the skeleton section

     */

    void ParseSkeletonElement(const char* szCurrent,

            const char **szCurrentOut, const char *end, int iTime);

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

    /** Parse a line in the nodes section

     */

    void ParseNodeInfo(const char* szCurrent,

            const char **szCurrentOut, const char *end);

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

    /** Parse a floating-point value

     */

    bool ParseFloat(const char* szCurrent,

            const char **szCurrentOut, const char *end, float &out);

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

    /** Parse an unsigned integer. There may be no sign!

     */

    bool ParseUnsignedInt(const char* szCurrent,

            const char **szCurrentOut, const char *end, unsigned int &out);

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

    /** Parse a signed integer. Signs (+,-) are handled.

     */

    bool ParseSignedInt(const char* szCurrent,

            const char **szCurrentOut, const char *end, int &out);

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

    /** Fix invalid time values in the file

     */

    void FixTimeValues();

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

    /** Add all children of a bone as sub-nodes to a node

     * \param pcNode Parent node

     * \param iParent Parent bone index

     */

    void AddBoneChildren(aiNode* pcNode, uint32_t iParent);

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

    /** Build output meshes/materials/nodes/animations

     */

    void CreateOutputMeshes();

    void CreateOutputNodes();

    void CreateOutputAnimations(const std::string &pFile, IOSystem* pIOHandler);

    void CreateOutputAnimation(int index, const std::string &name);

    void GetAnimationFileList(const std::string &pFile, IOSystem* pIOHandler, std::vector<std::tuple<std::string, std::string>>& outList);

    void CreateOutputMaterials();

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

    /** Print a log message together with the current line number

     */

    void LogErrorNoThrow(const char* msg);

    void LogWarning(const char* msg);

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

    inline bool SkipLine( const char* in, const char** out, const char *end) {

        Assimp::SkipLine(in, out, end);

        ++iLineNumber;

        return true;

    }

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

    inline bool SkipSpacesAndLineEnd(const char *in, const char **out, const char *end) {

        ++iLineNumber;

        return Assimp::SkipSpacesAndLineEnd(in, out, end);

    }

private:

    /** Configuration option: frame to be loaded */

    unsigned int configFrameID;

    /** Buffer to hold the loaded file */

    std::vector<char> mBuffer;

    char *mEnd;

    /** Output scene to be filled

    */

    aiScene* pScene;

    /** Size of the input file in bytes

     */

    unsigned int iFileSize;

    /** Array of textures found in the file

     */

    std::vector<std::string> aszTextures;

    /** Array of triangles found in the file

     */

    std::vector<SMD::Face> asTriangles;

    /** Array of bones found in the file

     */

    std::vector<SMD::Bone> asBones;

    /** Smallest frame index found in the skeleton

     */

    int iSmallestFrame;

    /** Length of the whole animation, in frames

     */

    double dLengthOfAnim;

    /** Do we have texture coordinates?

     */

    bool bHasUVs;

    /** Current line number

     */

    unsigned int iLineNumber;

    bool bLoadAnimationList = true;

    bool noSkeletonMesh = false;

};

} // end of namespace Assimp

#endif // AI_SMDIMPORTER_H_INC