/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
---------------------------------------------------------------------------

Copyright (c) 2006-2019, assimp team



All rights reserved.

Redistribution and use of this software in source and binary forms,
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following disclaimer.

* Redistributions in binary form must reproduce the above
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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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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,
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*/
#include "UnitTestPCH.h"

#include <assimp/scene.h>
#include <TriangulateProcess.h>


using namespace std;
using namespace Assimp;

class TriangulateProcessTest : public ::testing::Test {
public:
    virtual void SetUp();
    virtual void TearDown();

protected:
    aiMesh* pcMesh;
    TriangulateProcess* piProcess;
};

void TriangulateProcessTest::SetUp() {
    piProcess = new TriangulateProcess();
    pcMesh = new aiMesh();

    pcMesh->mNumFaces = 1000;
    pcMesh->mFaces = new aiFace[1000];
    pcMesh->mVertices = new aiVector3D[10000];

    pcMesh->mPrimitiveTypes = aiPrimitiveType_POINT | aiPrimitiveType_LINE |
    aiPrimitiveType_LINE | aiPrimitiveType_POLYGON;

    for (unsigned int m = 0, t = 0, q = 4; m < 1000; ++m) {
        ++t;
        aiFace& face = pcMesh->mFaces[m];
        face.mNumIndices = t;
        if (4 == t) {
            face.mNumIndices = q++;
            t = 0;

            if (10 == q)q = 4;
        }
        face.mIndices = new unsigned int[face.mNumIndices];
        for (unsigned int p = 0; p < face.mNumIndices; ++p) {
            face.mIndices[ p ] = pcMesh->mNumVertices;

            // construct fully convex input data in ccw winding, xy plane
            aiVector3D& v = pcMesh->mVertices[pcMesh->mNumVertices++];
            v.z = 0.f;
            v.x = cos (p * (float)(AI_MATH_TWO_PI)/face.mNumIndices);
            v.y = sin (p * (float)(AI_MATH_TWO_PI)/face.mNumIndices);
        }
    }
}

void TriangulateProcessTest::TearDown() {
    delete piProcess;
    delete pcMesh;
}

TEST_F(TriangulateProcessTest, testTriangulation) {
    piProcess->TriangulateMesh(pcMesh);

    for (unsigned int m = 0, t = 0, q = 4, max = 1000, idx = 0; m < max;++m) {
        ++t;
        aiFace& face = pcMesh->mFaces[m];
        if (4 == t) {
            t = 0;
            max += q-3;

            std::vector<bool> ait(q,false);

            for (unsigned int i = 0, tt = q-2; i < tt; ++i,++m) {
                aiFace& face = pcMesh->mFaces[m];
                EXPECT_EQ(3U, face.mNumIndices);

                for (unsigned int qqq = 0; qqq < face.mNumIndices; ++qqq) {
                    ait[face.mIndices[qqq]-idx] = true;
                }
            }
            for (std::vector<bool>::const_iterator it = ait.begin(); it != ait.end(); ++it) {
                EXPECT_TRUE(*it);
            }
            --m;
            idx+=q;
            if ( ++q == 10 ) {
                q = 4;
            }
        } else {
            EXPECT_EQ(t, face.mNumIndices);

            for (unsigned int i = 0; i < face.mNumIndices; ++i,++idx) {
                EXPECT_EQ(idx, face.mIndices[i]);
            }
        }
    }

    // we should have no valid normal vectors now necause we aren't a pure polygon mesh
    EXPECT_TRUE(pcMesh->mNormals == NULL);
}
