#include "fixtures/OpenGLTestFixture.h"
#include "XCEngine/RHI/OpenGL/OpenGLBuffer.h"

using namespace XCEngine::RHI;

TEST_F(OpenGLTestFixture, Buffer_Initialize_VertexBuffer) {
    OpenGLBuffer buffer;
    float vertices[] = { 0.0f, 0.0f, 0.5f, 0.5f };

    bool result = buffer.InitializeVertexBuffer(vertices, sizeof(vertices));

    ASSERT_TRUE(result);
    EXPECT_NE(buffer.GetID(), 0u);
    EXPECT_EQ(buffer.GetSize(), sizeof(vertices));
    EXPECT_EQ(buffer.GetType(), OpenGLBufferType::Vertex);

    buffer.Shutdown();
}

TEST_F(OpenGLTestFixture, Buffer_Initialize_IndexBuffer) {
    OpenGLBuffer buffer;
    unsigned int indices[] = { 0, 1, 2 };

    bool result = buffer.InitializeIndexBuffer(indices, sizeof(indices));

    ASSERT_TRUE(result);
    EXPECT_NE(buffer.GetID(), 0u);
    EXPECT_EQ(buffer.GetSize(), sizeof(indices));

    buffer.Shutdown();
}

TEST_F(OpenGLTestFixture, Buffer_Initialize_UniformBuffer) {
    OpenGLBuffer buffer;
    float data[16] = {};

    bool result = buffer.Initialize(OpenGLBufferType::Uniform, sizeof(data), data, true);

    ASSERT_TRUE(result);
    EXPECT_TRUE(buffer.IsDynamic());
    EXPECT_EQ(buffer.GetType(), OpenGLBufferType::Uniform);

    buffer.Shutdown();
}

TEST_F(OpenGLTestFixture, Buffer_Initialize_Dynamic) {
    OpenGLBuffer buffer;

    bool result = buffer.Initialize(OpenGLBufferType::CopyRead, 256, nullptr, true);

    ASSERT_TRUE(result);
    EXPECT_TRUE(buffer.IsDynamic());
    EXPECT_EQ(buffer.GetSize(), 256u);

    buffer.Shutdown();
}

TEST_F(OpenGLTestFixture, Buffer_Bind_Unbind) {
    OpenGLBuffer buffer;
    buffer.InitializeVertexBuffer(nullptr, 16);

    buffer.Bind();
    GLint boundBuffer = 0;
    glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &boundBuffer);
    EXPECT_EQ(boundBuffer, static_cast<GLint>(buffer.GetID()));

    buffer.Unbind();
    glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &boundBuffer);
    EXPECT_EQ(boundBuffer, 0);

    buffer.Shutdown();
}

TEST_F(OpenGLTestFixture, Buffer_Map_Unmap) {
    OpenGLBuffer buffer;
    buffer.Initialize(OpenGLBufferType::CopyRead, 256, nullptr, true);

    void* mappedData = buffer.Map();
    ASSERT_NE(mappedData, nullptr);

    memset(mappedData, 0xAB, 256);

    buffer.Unmap();

    GLenum error = glGetError();
    EXPECT_EQ(error, GL_NO_ERROR);

    buffer.Shutdown();
}