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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2017, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  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
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file ColladaExporter.h
+ * Declares the exporter class to write a scene to a Collada file
+ */
+#ifndef AI_COLLADAEXPORTER_H_INC
+#define AI_COLLADAEXPORTER_H_INC
+
+#include <assimp/ai_assert.h>
+#include <assimp/material.h>
+#include <assimp/mesh.h>
+#include <assimp/light.h>
+#include <assimp/Exporter.hpp>
+#include <sstream>
+#include <vector>
+#include <map>
+
+#include "StringUtils.h"
+
+struct aiScene;
+struct aiNode;
+
+namespace Assimp
+{
+
+/// Helper class to export a given scene to a Collada file. Just for my personal
+/// comfort when implementing it.
+class ColladaExporter
+{
+public:
+    /// Constructor for a specific scene to export
+    ColladaExporter( const aiScene* pScene, IOSystem* pIOSystem, const std::string& path, const std::string& file);
+
+    /// Destructor
+    virtual ~ColladaExporter();
+
+protected:
+    /// Starts writing the contents
+    void WriteFile();
+
+    /// Writes the asset header
+    void WriteHeader();
+
+    /// Writes the embedded textures
+    void WriteTextures();
+
+    /// Writes the material setup
+    void WriteMaterials();
+
+    /// Writes the cameras library
+    void WriteCamerasLibrary();
+
+    // Write a camera entry
+    void WriteCamera(size_t pIndex);
+
+    /// Writes the cameras library
+    void WriteLightsLibrary();
+
+    // Write a camera entry
+    void WriteLight(size_t pIndex);
+    void WritePointLight(const aiLight *const light);
+    void WriteDirectionalLight(const aiLight *const light);
+    void WriteSpotLight(const aiLight *const light);
+    void WriteAmbienttLight(const aiLight *const light);
+
+    /// Writes the controller library
+    void WriteControllerLibrary();
+
+    /// Writes a skin controller of the given mesh
+    void WriteController( size_t pIndex);
+
+    /// Writes the geometry library
+    void WriteGeometryLibrary();
+
+    /// Writes the given mesh
+    void WriteGeometry( size_t pIndex);
+
+    //enum FloatDataType { FloatType_Vector, FloatType_TexCoord2, FloatType_TexCoord3, FloatType_Color, FloatType_Mat4x4, FloatType_Weight };
+    // customized to add animation related type
+	enum FloatDataType { FloatType_Vector, FloatType_TexCoord2, FloatType_TexCoord3, FloatType_Color, FloatType_Mat4x4, FloatType_Weight, FloatType_Time };
+
+    /// Writes a float array of the given type
+    void WriteFloatArray( const std::string& pIdString, FloatDataType pType, const ai_real* pData, size_t pElementCount);
+
+    /// Writes the scene library
+    void WriteSceneLibrary();
+
+	// customized, Writes the animation library
+	void WriteAnimationsLibrary();
+	void WriteAnimationLibrary( size_t pIndex);
+	std::string mFoundSkeletonRootNodeID = "skeleton_root";	 	// will be replaced by found node id in the WriteNode call.
+	
+    /// Recursively writes the given node
+    void WriteNode( const aiScene* scene, aiNode* pNode);
+
+    /// Enters a new xml element, which increases the indentation
+    void PushTag() { startstr.append( "  "); }
+    /// Leaves an element, decreasing the indentation
+    void PopTag() { 
+        ai_assert( startstr.length() > 1); 
+        startstr.erase( startstr.length() - 2); 
+    }
+
+    /// Creates a mesh ID for the given mesh
+    std::string GetMeshId( size_t pIndex) const {
+        return std::string( "meshId" ) + to_string(pIndex);
+    }
+
+public:
+    /// Stringstream to write all output into
+    std::stringstream mOutput;
+
+protected:
+    /// The IOSystem for output
+    IOSystem* mIOSystem;
+
+    /// Path of the directory where the scene will be exported
+    const std::string mPath;
+
+    /// Name of the file (without extension) where the scene will be exported
+    const std::string mFile;
+
+    /// The scene to be written
+    const aiScene* mScene;
+    bool mSceneOwned;
+
+    /// current line start string, contains the current indentation for simple stream insertion
+    std::string startstr;
+    /// current line end string for simple stream insertion
+    std::string endstr;
+
+  // pair of color and texture - texture precedences color
+  struct Surface
+  {
+    bool exist;
+    aiColor4D color;
+    std::string texture;
+    size_t channel;
+    Surface() { exist = false; channel = 0; }
+  };
+
+  struct Property
+  {
+    bool exist;
+     ai_real value;
+     Property()
+         : exist(false)
+         , value(0.0)
+     {}
+  };
+
+  // summarize a material in an convinient way.
+  struct Material
+  {
+    std::string name;
+    std::string shading_model;
+    Surface ambient, diffuse, specular, emissive, reflective, transparent, normal;
+    Property shininess, transparency, index_refraction;
+
+    Material() {}
+  };
+
+  std::vector<Material> materials;
+
+  std::map<unsigned int, std::string> textures;
+
+protected:
+  /// Dammit C++ - y u no compile two-pass? No I have to add all methods below the struct definitions
+  /// Reads a single surface entry from the given material keys
+  void ReadMaterialSurface( Surface& poSurface, const aiMaterial* pSrcMat, aiTextureType pTexture, const char* pKey, size_t pType, size_t pIndex);
+  /// Writes an image entry for the given surface
+  void WriteImageEntry( const Surface& pSurface, const std::string& pNameAdd);
+  /// Writes the two parameters necessary for referencing a texture in an effect entry
+  void WriteTextureParamEntry( const Surface& pSurface, const std::string& pTypeName, const std::string& pMatName);
+  /// Writes a color-or-texture entry into an effect definition
+  void WriteTextureColorEntry( const Surface& pSurface, const std::string& pTypeName, const std::string& pImageName);
+  /// Writes a scalar property
+  void WriteFloatEntry( const Property& pProperty, const std::string& pTypeName);
+};
+
+}
+
+#endif // !! AI_COLLADAEXPORTER_H_INC