#include "Features/Hierarchy/HierarchyModel.h"
#include "Scene/EditorSceneBridge.h"

#include <XCEngine/Components/GameObject.h>
#include <XCEngine/Core/Asset/ResourceManager.h>
#include <XCEngine/Scene/Scene.h>
#include <XCEngine/Scene/SceneManager.h>

#include <gtest/gtest.h>

#include <chrono>
#include <filesystem>

namespace XCEngine::UI::Editor::App {
namespace {

using ::XCEngine::Components::GameObject;
using ::XCEngine::Components::Scene;
using ::XCEngine::Components::SceneManager;

class ScopedSceneManagerReset final {
public:
    ScopedSceneManagerReset() {
        Reset();
    }

    ~ScopedSceneManagerReset() {
        Reset();
    }

private:
    static void Reset() {
        SceneManager& manager = SceneManager::Get();
        const auto scenes = manager.GetAllScenes();
        for (Scene* scene : scenes) {
            manager.UnloadScene(scene);
        }
    }
};

class TemporaryProjectRoot final {
public:
    TemporaryProjectRoot() {
        const auto uniqueSuffix =
            std::chrono::steady_clock::now().time_since_epoch().count();
        m_root =
            std::filesystem::temp_directory_path() /
            ("xcui_hierarchy_scene_bridge_" + std::to_string(uniqueSuffix));
    }

    ~TemporaryProjectRoot() {
        std::error_code errorCode = {};
        std::filesystem::remove_all(m_root, errorCode);
    }

    const std::filesystem::path& Root() const {
        return m_root;
    }

private:
    std::filesystem::path m_root = {};
};

TEST(HierarchySceneBindingTests, BuildFromSceneUsesRealGameObjectIds) {
    ScopedSceneManagerReset reset = {};

    Scene* scene = SceneManager::Get().CreateScene("Main");
    ASSERT_NE(scene, nullptr);
    SceneManager::Get().SetActiveScene(scene);

    GameObject* root = scene->CreateGameObject("Root");
    ASSERT_NE(root, nullptr);
    GameObject* child = scene->CreateGameObject("Child", root);
    ASSERT_NE(child, nullptr);

    const HierarchyModel model = HierarchyModel::BuildFromScene(scene);
    const HierarchyNode* rootNode =
        model.FindNode(MakeEditorGameObjectItemId(root->GetID()));
    ASSERT_NE(rootNode, nullptr);
    EXPECT_EQ(rootNode->label, "Root");
    ASSERT_EQ(rootNode->children.size(), 1u);
    EXPECT_EQ(
        rootNode->children.front().nodeId,
        MakeEditorGameObjectItemId(child->GetID()));
    EXPECT_EQ(rootNode->children.front().label, "Child");
}

TEST(HierarchySceneBindingTests, DuplicateGameObjectClonesHierarchyIntoScene) {
    ScopedSceneManagerReset reset = {};

    Scene* scene = SceneManager::Get().CreateScene("Main");
    ASSERT_NE(scene, nullptr);
    SceneManager::Get().SetActiveScene(scene);

    GameObject* root = scene->CreateGameObject("Root");
    ASSERT_NE(root, nullptr);
    GameObject* child = scene->CreateGameObject("Child", root);
    ASSERT_NE(child, nullptr);

    const std::string duplicateId =
        DuplicateEditorGameObject(MakeEditorGameObjectItemId(root->GetID()));
    ASSERT_FALSE(duplicateId.empty());

    const HierarchyModel model = HierarchyModel::BuildFromScene(scene);
    const HierarchyNode* duplicateNode = model.FindNode(duplicateId);
    ASSERT_NE(duplicateNode, nullptr);
    EXPECT_EQ(duplicateNode->label, "Root");
    ASSERT_EQ(duplicateNode->children.size(), 1u);
    EXPECT_EQ(duplicateNode->children.front().label, "Child");

    const auto roots = scene->GetRootGameObjects();
    EXPECT_EQ(roots.size(), 2u);
}

TEST(HierarchySceneBindingTests, RenameGameObjectUpdatesRealSceneAndProjection) {
    ScopedSceneManagerReset reset = {};

    Scene* scene = SceneManager::Get().CreateScene("Main");
    ASSERT_NE(scene, nullptr);
    SceneManager::Get().SetActiveScene(scene);

    GameObject* gameObject = scene->CreateGameObject("Camera");
    ASSERT_NE(gameObject, nullptr);

    const std::string itemId =
        MakeEditorGameObjectItemId(gameObject->GetID());
    ASSERT_TRUE(RenameEditorGameObject(itemId, "PlayerCamera"));
    EXPECT_EQ(gameObject->GetName(), "PlayerCamera");

    const HierarchyModel model = HierarchyModel::BuildFromScene(scene);
    const HierarchyNode* node = model.FindNode(itemId);
    ASSERT_NE(node, nullptr);
    EXPECT_EQ(node->label, "PlayerCamera");
}

TEST(HierarchySceneBindingTests, ReparentAndMoveToRootOperateOnRealScene) {
    ScopedSceneManagerReset reset = {};

    Scene* scene = SceneManager::Get().CreateScene("Main");
    ASSERT_NE(scene, nullptr);
    SceneManager::Get().SetActiveScene(scene);

    GameObject* parentA = scene->CreateGameObject("ParentA");
    ASSERT_NE(parentA, nullptr);
    GameObject* parentB = scene->CreateGameObject("ParentB");
    ASSERT_NE(parentB, nullptr);
    GameObject* child = scene->CreateGameObject("Child", parentA);
    ASSERT_NE(child, nullptr);

    ASSERT_TRUE(ReparentEditorGameObject(
        MakeEditorGameObjectItemId(child->GetID()),
        MakeEditorGameObjectItemId(parentB->GetID())));
    EXPECT_EQ(child->GetParent(), parentB);

    HierarchyModel model = HierarchyModel::BuildFromScene(scene);
    const HierarchyNode* parentBNode =
        model.FindNode(MakeEditorGameObjectItemId(parentB->GetID()));
    ASSERT_NE(parentBNode, nullptr);
    ASSERT_EQ(parentBNode->children.size(), 1u);
    EXPECT_EQ(parentBNode->children.front().label, "Child");

    ASSERT_TRUE(MoveEditorGameObjectToRoot(
        MakeEditorGameObjectItemId(child->GetID())));
    EXPECT_EQ(child->GetParent(), nullptr);

    model = HierarchyModel::BuildFromScene(scene);
    const auto roots = scene->GetRootGameObjects();
    EXPECT_EQ(roots.size(), 3u);
}

TEST(HierarchySceneBindingTests, EnsureStartupSceneLoadsMainSceneAndSetsActive) {
    ScopedSceneManagerReset reset = {};
    TemporaryProjectRoot projectRoot = {};

    const std::filesystem::path scenePath =
        projectRoot.Root() / "Assets" / "Scenes" / "Main.xc";
    std::filesystem::create_directories(scenePath.parent_path());
    {
        Scene scene("Main");
        scene.CreateGameObject("Camera");
        scene.Save(scenePath.string());
    }

    const EditorStartupSceneResult result =
        EnsureEditorStartupScene(projectRoot.Root());
    EXPECT_TRUE(result.ready);
    EXPECT_TRUE(result.loadedFromDisk);
    ASSERT_NE(GetActiveEditorScene(), nullptr);
    EXPECT_EQ(GetActiveEditorScene()->GetName(), "Main");

    const HierarchyModel model =
        HierarchyModel::BuildFromScene(GetActiveEditorScene());
    EXPECT_FALSE(model.Empty());

    SceneManager& sceneManager = SceneManager::Get();
    const auto scenes = sceneManager.GetAllScenes();
    for (Scene* scene : scenes) {
        sceneManager.UnloadScene(scene);
    }
    ::XCEngine::Resources::ResourceManager::Get().Shutdown();
}

} // namespace
} // namespace XCEngine::UI::Editor::App