#include <gtest/gtest.h>

#include "Utils/ProjectFileUtils.h"
#include "Utils/ProjectGraphicsSettings.h"

#include <chrono>
#include <filesystem>

namespace XCEngine::Editor::ProjectGraphicsSettings {
namespace {

class ProjectGraphicsSettingsTest : public ::testing::Test {
protected:
    void SetUp() override {
        const auto stamp = std::chrono::steady_clock::now()
                               .time_since_epoch()
                               .count();
        m_projectRoot =
            std::filesystem::temp_directory_path() /
            ("xc_project_graphics_settings_" + std::to_string(stamp));
        std::filesystem::create_directories(m_projectRoot);
    }

    void TearDown() override {
        std::error_code ec;
        std::filesystem::remove_all(m_projectRoot, ec);
    }

    std::filesystem::path m_projectRoot;
    ::XCEngine::Rendering::GraphicsSettingsState m_state;
};

TEST_F(ProjectGraphicsSettingsTest, BuildsDescriptorFromNativeSelection) {
    ::XCEngine::Rendering::Pipelines::ManagedRenderPipelineAssetDescriptor
        nativeDescriptor = {};
    nativeDescriptor.assemblyName = "GameScripts";
    nativeDescriptor.namespaceName = "Gameplay";
    nativeDescriptor.className = "ManagedForwardRenderPipelineProbeAsset";
    nativeDescriptor.managedAssetHandle = 77u;
    m_state.SetConfiguredRenderPipelineAssetDescriptor(nativeDescriptor);

    const auto descriptor = BuildDescriptor(m_state);
    EXPECT_EQ(descriptor.renderPipelineAssetAssembly, "GameScripts");
    EXPECT_EQ(descriptor.renderPipelineAssetNamespace, "Gameplay");
    EXPECT_EQ(
        descriptor.renderPipelineAssetClass,
        "ManagedForwardRenderPipelineProbeAsset");
}

TEST_F(ProjectGraphicsSettingsTest, SavesNativeSelectionIntoProjectSettingsFile) {
    ::XCEngine::Rendering::Pipelines::ManagedRenderPipelineAssetDescriptor
        nativeDescriptor = {};
    nativeDescriptor.assemblyName = "GameScripts";
    nativeDescriptor.namespaceName = "Gameplay";
    nativeDescriptor.className = "ManagedForwardRenderPipelineProbeAsset";
    nativeDescriptor.managedAssetHandle = 88u;
    m_state.SetConfiguredRenderPipelineAssetDescriptor(nativeDescriptor);

    ASSERT_TRUE(SaveSelection(m_projectRoot.string(), m_state));

    const auto loaded =
        ProjectFileUtils::LoadProjectGraphicsSettings(m_projectRoot.string());
    ASSERT_TRUE(loaded.has_value());
    EXPECT_EQ(loaded->renderPipelineAssetAssembly, "GameScripts");
    EXPECT_EQ(loaded->renderPipelineAssetNamespace, "Gameplay");
    EXPECT_EQ(
        loaded->renderPipelineAssetClass,
        "ManagedForwardRenderPipelineProbeAsset");
}

TEST_F(
    ProjectGraphicsSettingsTest,
    AppliesProjectSettingsSelectionIntoNativeState) {
    ProjectFileUtils::GraphicsSettingsDescriptor savedDescriptor;
    savedDescriptor.renderPipelineAssetAssembly = "GameScripts";
    savedDescriptor.renderPipelineAssetNamespace = "Gameplay";
    savedDescriptor.renderPipelineAssetClass =
        "ManagedForwardRenderPipelineProbeAsset";
    ASSERT_TRUE(ProjectFileUtils::SaveProjectGraphicsSettings(
        m_projectRoot.string(),
        savedDescriptor));

    ApplySelection(m_projectRoot.string(), m_state);

    const auto nativeDescriptor =
        m_state.GetConfiguredRenderPipelineAssetDescriptor();
    EXPECT_EQ(nativeDescriptor.assemblyName, "GameScripts");
    EXPECT_EQ(nativeDescriptor.namespaceName, "Gameplay");
    EXPECT_EQ(
        nativeDescriptor.className,
        "ManagedForwardRenderPipelineProbeAsset");
    EXPECT_EQ(nativeDescriptor.managedAssetHandle, 0u);
}

TEST_F(
    ProjectGraphicsSettingsTest,
    ClearsNativeSelectionWhenProjectSettingsFileIsMissing) {
    ::XCEngine::Rendering::Pipelines::ManagedRenderPipelineAssetDescriptor
        nativeDescriptor = {};
    nativeDescriptor.assemblyName = "GameScripts";
    nativeDescriptor.className = "ManagedForwardRenderPipelineProbeAsset";
    nativeDescriptor.managedAssetHandle = 99u;
    m_state.SetConfiguredRenderPipelineAssetDescriptor(nativeDescriptor);

    ApplySelection(m_projectRoot.string(), m_state);

    EXPECT_FALSE(m_state.GetConfiguredRenderPipelineAssetDescriptor().IsValid());
    EXPECT_EQ(
        m_state.GetConfiguredRenderPipelineAssetDescriptor().managedAssetHandle,
        0u);
}

} // namespace
} // namespace XCEngine::Editor::ProjectGraphicsSettings