/********************************************************************************
* ReactPhysics3D physics library, http://www.reactphysics3d.com                 *
* Copyright (c) 2010-2016 Daniel Chappuis                                       *
*********************************************************************************
*                                                                               *
* This software is provided 'as-is', without any express or implied warranty.   *
* In no event will the authors be held liable for any damages arising from the  *
* use of this software.                                                         *
*                                                                               *
* Permission is granted to anyone to use this software for any purpose,         *
* including commercial applications, and to alter it and redistribute it        *
* freely, subject to the following restrictions:                                *
*                                                                               *
* 1. The origin of this software must not be misrepresented; you must not claim *
*    that you wrote the original software. If you use this software in a        *
*    product, an acknowledgment in the product documentation would be           *
*    appreciated but is not required.                                           *
*                                                                               *
* 2. Altered source versions must be plainly marked as such, and must not be    *
*    misrepresented as being the original software.                             *
*                                                                               *
* 3. This notice may not be removed or altered from any source distribution.    *
*                                                                               *
********************************************************************************/

#ifndef CONVEX_MESH_H
#define CONVEX_MESH_H

// Libraries
#include "openglframework.h"
#include <reactphysics3d/reactphysics3d.h>
#include "PhysicsObject.h"

// Class ConvexMesh
class ConvexMesh : public PhysicsObject {

    private :

        // -------------------- Attributes -------------------- //

        rp3d::PolygonVertexArray::PolygonFace* mPolygonFaces;

        rp3d::PolygonVertexArray* mPolygonVertexArray;

        rp3d::PolyhedronMesh* mPolyhedronMesh;

        /// Collision shape
        rp3d::ConvexMeshShape* mConvexShape;
        rp3d::Collider* mCollider;

        /// Scaling matrix
        openglframework::Matrix4 mScalingMatrix;

        /// Vertex Buffer Object for the vertices data
        openglframework::VertexBufferObject mVBOVertices;

        /// Vertex Buffer Object for the normals data
        openglframework::VertexBufferObject mVBONormals;

        /// Vertex Buffer Object for the texture coords
        openglframework::VertexBufferObject mVBOTextureCoords;

        /// Vertex Buffer Object for the indices
        openglframework::VertexBufferObject mVBOIndices;

        /// Vertex Array Object for the vertex data
        openglframework::VertexArrayObject mVAO;

		/// Array with the vertices of the convex mesh
		/// (only the vertices used for the physics shape, not duplicate vertices used for rendering)
		std::vector<openglframework::Vector3> mConvexMeshVertices;

		/// Array with the vertex indices of the convex mesh (used for the physics shape)
		std::vector<int> mConvexMeshIndices;

        // -------------------- Methods -------------------- //

        /// Create the Vertex Buffer Objects used to render with OpenGL.
        void createVBOAndVAO();

		/// Return the index of a given vertex in the mesh
		int findVertexIndex(const std::vector<openglframework::Vector3>& vertices, const openglframework::Vector3& vertex);

    public :

        // -------------------- Methods -------------------- //

        /// Constructor
        ConvexMesh(bool createRigidBody, rp3d::PhysicsCommon& physicsCommon, rp3d::PhysicsWorld* physicsWorld, const std::string& meshPath);

        /// Destructor
        virtual ~ConvexMesh() override;

        /// Render the mesh at the correct position and with the correct orientation
        virtual void render(openglframework::Shader& shader, const openglframework::Matrix4& worldToCameraMatrix) override;

        /// Update the transform matrix of the object
        virtual void updateTransform(float interpolationFactor) override;

        /// Return the collider
        rp3d::Collider* getCollider();
};

// Update the transform matrix of the object
inline void ConvexMesh::updateTransform(float interpolationFactor) {
    mTransformMatrix = computeTransform(interpolationFactor, mScalingMatrix);
}

// Return the collider
inline rp3d::Collider* ConvexMesh::getCollider() {
    return mCollider;
}

#endif