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/** @file utMDLImporter_HL1_Materials.cpp
 *  @brief Half-Life 1 MDL loader materials tests.
 */

#include "UnitTestPCH.h"
#include "AbstractImportExportBase.h"
#include <assimp/postprocess.h>
#include <assimp/scene.h>
#include <assimp/Importer.hpp>
#include "MDLHL1TestFiles.h"
#include "MDL/HalfLife/HL1ImportDefinitions.h"

using namespace Assimp;

class utMDLImporter_HL1_Materials : public ::testing::Test {

public:
    /* Given an MDL model with a texture flagged as flatshade,
       verify that the imported model has a flat shading model. */
    void flatShadeTexture() {
        Assimp::Importer importer;
        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "chrome_sphere.mdl", aiProcess_ValidateDataStructure);
        EXPECT_NE(nullptr, scene);
        EXPECT_NE(nullptr, scene->mMaterials);

        aiShadingMode shading_mode;
        scene->mMaterials[0]->Get(AI_MATKEY_SHADING_MODEL, shading_mode);
        EXPECT_EQ(aiShadingMode_Flat, shading_mode);
    }

    /* Given an MDL model with a chrome texture, verify that
       the imported model has a chrome material. */
    void chromeTexture() {
        Assimp::Importer importer;
        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "chrome_sphere.mdl", aiProcess_ValidateDataStructure);
        EXPECT_NE(nullptr, scene);
        EXPECT_NE(nullptr, scene->mMaterials);

        int chrome;
        scene->mMaterials[0]->Get(AI_MDL_HL1_MATKEY_CHROME(aiTextureType_DIFFUSE, 0), chrome);
        EXPECT_EQ(1, chrome);
    }

    /* Given an MDL model with an additive texture, verify that
       the imported model has an additive material. */
    void additiveBlendTexture() {
        Assimp::Importer importer;
        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "blend_additive.mdl", aiProcess_ValidateDataStructure);
        EXPECT_NE(nullptr, scene);
        EXPECT_NE(nullptr, scene->mMaterials);

        aiBlendMode blend_mode;
        scene->mMaterials[0]->Get(AI_MATKEY_BLEND_FUNC, blend_mode);
        EXPECT_EQ(aiBlendMode_Additive, blend_mode);
    }

    /* Given an MDL model with a color masked texture, verify that
       the imported model has a color masked material. Ensure too
       that the transparency color is the correct one. */
    void textureWithColorMask() {
        Assimp::Importer importer;
        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "alpha_test.mdl", aiProcess_ValidateDataStructure);
        EXPECT_NE(nullptr, scene);
        EXPECT_NE(nullptr, scene->mMaterials);

        int texture_flags;
        scene->mMaterials[0]->Get(AI_MATKEY_TEXFLAGS_DIFFUSE(0), texture_flags);
        EXPECT_EQ(aiTextureFlags_UseAlpha, texture_flags);

        // The model has only one texture, a 256 color bitmap with
        // a palette. Pure blue is the last color in the palette,
        // and should be the transparency color.
        aiColor3D transparency_color;
        scene->mMaterials[0]->Get(AI_MATKEY_COLOR_TRANSPARENT, transparency_color);
        EXPECT_EQ(aiColor3D(0, 0, 255), transparency_color);
    }
};

TEST_F(utMDLImporter_HL1_Materials, flatShadeTexture) {
    flatShadeTexture();
}

TEST_F(utMDLImporter_HL1_Materials, chromeTexture) {
    chromeTexture();
}

TEST_F(utMDLImporter_HL1_Materials, additiveBlendTexture) {
    additiveBlendTexture();
}

TEST_F(utMDLImporter_HL1_Materials, textureWithColorMask) {
    textureWithColorMask();
}
