/*
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 IRRLoader.h
 *  @brief Declaration of the .irrMesh (Irrlight Engine Mesh Format)
 *  importer class.
 */
#ifndef AI_IRRLOADER_H_INCLUDED
#define AI_IRRLOADER_H_INCLUDED

#include "IRRShared.h"
#include <assimp/SceneCombiner.h>
#include "Importer.h"
#include "StringUtils.h"
#include <assimp/anim.h>

namespace Assimp    {


// ---------------------------------------------------------------------------
/** Irr importer class.
 *
 * Irr is the native scene file format of the Irrlight engine and its editor
 * irrEdit. As IrrEdit itself is capable of importing quite many file formats,
 * it might be a good file format for data exchange.
 */
class IRRImporter : public BaseImporter, public IrrlichtBase
{
public:
    IRRImporter();
    ~IRRImporter();


public:

    // -------------------------------------------------------------------
    /** 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;

protected:

    // -------------------------------------------------------------------
    /**
     */
    const aiImporterDesc* GetInfo () const;

    // -------------------------------------------------------------------
    /**
     */
    void InternReadFile( const std::string& pFile, aiScene* pScene,
        IOSystem* pIOHandler);

    // -------------------------------------------------------------------
    /**
    */
    void SetupProperties(const Importer* pImp);

private:

    /** Data structure for a scenegraph node animator
     */
    struct Animator
    {
        // Type of the animator
        enum AT
        {
            UNKNOWN       = 0x0,
            ROTATION      = 0x1,
            FLY_CIRCLE    = 0x2,
            FLY_STRAIGHT  = 0x3,
            FOLLOW_SPLINE = 0x4,
            OTHER         = 0x5

        } type;

        explicit Animator(AT t = UNKNOWN)
            : type              (t)
            , speed             ( ai_real( 0.001 ) )
            , direction         ( ai_real( 0.0 ), ai_real( 1.0 ), ai_real( 0.0 ) )
            , circleRadius      ( ai_real( 1.0) )
            , tightness         ( ai_real( 0.5 ) )
            , loop              (true)
            , timeForWay        (100)
        {
        }


        // common parameters
        ai_real speed;
        aiVector3D direction;

        // FLY_CIRCLE
        aiVector3D circleCenter;
        ai_real circleRadius;

        // FOLLOW_SPLINE
        ai_real tightness;
        std::vector<aiVectorKey> splineKeys;

        // ROTATION (angles given in direction)

        // FLY STRAIGHT
        // circleCenter = start, direction = end
        bool loop;
        int timeForWay;
    };

    /** Data structure for a scenegraph node in an IRR file
     */
    struct Node
    {
        // Type of the node
        enum ET
        {
            LIGHT,
            CUBE,
            MESH,
            SKYBOX,
            DUMMY,
            CAMERA,
            TERRAIN,
            SPHERE,
            ANIMMESH
        } type;

        explicit Node(ET t)
            :   type                (t)
            ,   scaling             (1.0,1.0,1.0) // assume uniform scaling by default
            ,   parent()
            ,   framesPerSecond     (0.0)
            ,   id()
            ,   sphereRadius        (1.0)
            ,   spherePolyCountX    (100)
            ,   spherePolyCountY    (100)
        {

            // Generate a default name for the node
            char buffer[128];
            static int cnt;
            ai_snprintf(buffer, 128, "IrrNode_%i",cnt++);
            name = std::string(buffer);

            // reserve space for up to 5 materials
            materials.reserve(5);

            // reserve space for up to 5 children
            children.reserve(5);
        }

        // Transformation of the node
        aiVector3D position, rotation, scaling;

        // Name of the node
        std::string name;

        // List of all child nodes
        std::vector<Node*> children;

        // Parent node
        Node* parent;

        // Animated meshes: frames per second
        // 0.f if not specified
        ai_real framesPerSecond;

        // Meshes: path to the mesh to be loaded
        std::string meshPath;
        unsigned int id;

        // Meshes: List of materials to be assigned
        // along with their corresponding material flags
        std::vector< std::pair<aiMaterial*, unsigned int> > materials;

        // Spheres: radius of the sphere to be generates
        ai_real sphereRadius;

        // Spheres: Number of polygons in the x,y direction
        unsigned int spherePolyCountX,spherePolyCountY;

        // List of all animators assigned to the node
        std::list<Animator> animators;
    };

    /** Data structure for a vertex in an IRR skybox
     */
    struct SkyboxVertex
    {
        SkyboxVertex()
        {}

        //! Construction from single vertex components
        SkyboxVertex(ai_real px, ai_real py, ai_real pz,
            ai_real nx, ai_real ny, ai_real nz,
            ai_real uvx, ai_real uvy)

            :   position    (px,py,pz)
            ,   normal      (nx,ny,nz)
            ,   uv          (uvx,uvy,0.0)
        {}

        aiVector3D position, normal, uv;
    };


    // -------------------------------------------------------------------
    /** Fill the scenegraph recursively
     */
    void GenerateGraph(Node* root,aiNode* rootOut ,aiScene* scene,
        BatchLoader& batch,
        std::vector<aiMesh*>& meshes,
        std::vector<aiNodeAnim*>& anims,
        std::vector<AttachmentInfo>& attach,
        std::vector<aiMaterial*>& materials,
        unsigned int& defaultMatIdx);


    // -------------------------------------------------------------------
    /** Generate a mesh that consists of just a single quad
     */
    aiMesh* BuildSingleQuadMesh(const SkyboxVertex& v1,
        const SkyboxVertex& v2,
        const SkyboxVertex& v3,
        const SkyboxVertex& v4);


    // -------------------------------------------------------------------
    /** Build a skybox
     *
     *  @param meshes Receives 6 output meshes
     *  @param materials The last 6 materials are assigned to the newly
     *    created meshes. The names of the materials are adjusted.
     */
    void BuildSkybox(std::vector<aiMesh*>& meshes,
        std::vector<aiMaterial*> materials);


    // -------------------------------------------------------------------
    /** Copy a material for a mesh to the output material list
     *
     *  @param materials Receives an output material
     *  @param inmaterials List of input materials
     *  @param defMatIdx Default material index - UINT_MAX if not present
     *  @param mesh Mesh to work on
     */
    void CopyMaterial(std::vector<aiMaterial*>&  materials,
        std::vector< std::pair<aiMaterial*, unsigned int> >& inmaterials,
        unsigned int& defMatIdx,
        aiMesh* mesh);


    // -------------------------------------------------------------------
    /** Compute animations for a specific node
     *
     *  @param root Node to be processed
     *  @param anims The list of output animations
     */
    void ComputeAnimations(Node* root, aiNode* real,
        std::vector<aiNodeAnim*>& anims);


private:

    /** Configuration option: desired output FPS */
    double fps;

    /** Configuration option: speed flag was set? */
    bool configSpeedFlag;
};

} // end of namespace Assimp

#endif // AI_IRRIMPORTER_H_INC