#include "Commands/ProjectCommands.h"
#include "Core/EditorContext.h"

#include <XCEngine/Components/CameraComponent.h>
#include <XCEngine/Components/GameObject.h>
#include <XCEngine/Components/LightComponent.h>
#include <XCEngine/Components/MeshFilterComponent.h>
#include <XCEngine/Components/MeshRendererComponent.h>
#include <XCEngine/Core/Asset/ResourceManager.h>
#include <XCEngine/Core/Math/Color.h>
#include <XCEngine/Core/Math/Quaternion.h>
#include <XCEngine/Core/Math/Rect.h>
#include <XCEngine/Core/Math/Vector3.h>

#include <filesystem>
#include <iostream>
#include <memory>
#include <string>

namespace fs = std::filesystem;

namespace {

constexpr const char* kDefaultModelAssetPath = "Assets/Models/nahida/Avatar_Loli_Catalyst_Nahida.fbx";
constexpr const char* kDefaultSceneAssetPath = "Assets/Scenes/NahidaPreview.xc";
constexpr const char* kDefaultSceneName = "Nahida Preview";

std::shared_ptr<XCEngine::Editor::AssetItem> MakeModelAssetItem(
    const fs::path& projectRoot,
    const std::string& modelAssetPath) {
    auto item = std::make_shared<XCEngine::Editor::AssetItem>();
    item->name = fs::path(modelAssetPath).filename().string();
    item->type = "Model";
    item->isFolder = false;
    item->fullPath = (projectRoot / fs::path(modelAssetPath)).string();
    return item;
}

void ConfigurePreviewCamera(XCEngine::Components::GameObject& gameObject) {
    using namespace XCEngine;

    gameObject.GetTransform()->SetLocalPosition(Math::Vector3(0.0f, 1.3f, -2.75f));
    gameObject.GetTransform()->SetLocalRotation(Math::Quaternion(0.104528f, 0.0f, 0.0f, 0.994522f));

    auto* camera = gameObject.AddComponent<Components::CameraComponent>();
    camera->SetProjectionType(Components::CameraProjectionType::Perspective);
    camera->SetFieldOfView(35.0f);
    camera->SetNearClipPlane(0.01f);
    camera->SetFarClipPlane(100.0f);
    camera->SetDepth(0.0f);
    camera->SetPrimary(true);
    camera->SetClearMode(Components::CameraClearMode::Auto);
    camera->SetStackType(Components::CameraStackType::Base);
    camera->SetCullingMask(0xFFFFFFFFu);
    camera->SetViewportRect(Math::Rect(0.0f, 0.0f, 1.0f, 1.0f));
    camera->SetClearColor(Math::Color(0.04f, 0.05f, 0.07f, 1.0f));
    camera->SetSkyboxEnabled(false);
    camera->SetSkyboxTopColor(Math::Color(0.18f, 0.36f, 0.74f, 1.0f));
    camera->SetSkyboxHorizonColor(Math::Color(0.78f, 0.84f, 0.92f, 1.0f));
    camera->SetSkyboxBottomColor(Math::Color(0.92f, 0.93f, 0.95f, 1.0f));
}

void ConfigureKeyLight(XCEngine::Components::GameObject& gameObject) {
    using namespace XCEngine;

    gameObject.GetTransform()->SetLocalPosition(Math::Vector3(2.5f, 3.0f, -2.0f));
    gameObject.GetTransform()->SetLocalRotation(Math::Quaternion(0.21644f, -0.39404f, 0.09198f, 0.88755f));

    auto* light = gameObject.AddComponent<Components::LightComponent>();
    light->SetLightType(Components::LightType::Directional);
    light->SetColor(Math::Color(1.0f, 0.976f, 0.94f, 1.0f));
    light->SetIntensity(1.4f);
    light->SetRange(10.0f);
    light->SetSpotAngle(30.0f);
    light->SetCastsShadows(true);
}

void ConfigureFillLight(XCEngine::Components::GameObject& gameObject) {
    using namespace XCEngine;

    gameObject.GetTransform()->SetLocalPosition(Math::Vector3(-1.75f, 1.5f, -1.25f));
    gameObject.GetTransform()->SetLocalRotation(Math::Quaternion::Identity());

    auto* light = gameObject.AddComponent<Components::LightComponent>();
    light->SetLightType(Components::LightType::Point);
    light->SetColor(Math::Color(0.24f, 0.32f, 0.5f, 1.0f));
    light->SetIntensity(0.35f);
    light->SetRange(10.0f);
    light->SetSpotAngle(30.0f);
    light->SetCastsShadows(false);
}

void ConfigureGround(XCEngine::Components::GameObject& gameObject) {
    using namespace XCEngine;

    gameObject.GetTransform()->SetLocalPosition(Math::Vector3::Zero());
    gameObject.GetTransform()->SetLocalRotation(Math::Quaternion::Identity());
    gameObject.GetTransform()->SetLocalScale(Math::Vector3(8.0f, 1.0f, 8.0f));

    auto* meshFilter = gameObject.AddComponent<Components::MeshFilterComponent>();
    meshFilter->SetMeshPath("builtin://meshes/plane");

    auto* meshRenderer = gameObject.AddComponent<Components::MeshRendererComponent>();
    meshRenderer->SetMaterialPath(0, "builtin://materials/default-primitive");
    meshRenderer->SetCastShadows(true);
    meshRenderer->SetReceiveShadows(true);
    meshRenderer->SetRenderLayer(0);
}

std::string ParseArgValue(int argc, char** argv, const char* name, const char* fallback) {
    const std::string optionPrefix = std::string(name) + "=";
    for (int index = 1; index < argc; ++index) {
        const std::string argument = argv[index];
        if (argument.rfind(optionPrefix, 0) == 0) {
            return argument.substr(optionPrefix.size());
        }
    }

    return fallback != nullptr ? std::string(fallback) : std::string();
}

} // namespace

int main(int argc, char** argv) {
    using namespace XCEngine;

    const fs::path repoRoot(XCENGINE_EDITOR_REPO_ROOT);
    const std::string projectArg = ParseArgValue(argc, argv, "--project-root", nullptr);
    const fs::path projectRoot = projectArg.empty() ? (repoRoot / "project") : fs::path(projectArg);
    const std::string modelAssetPath =
        ParseArgValue(argc, argv, "--model-asset", kDefaultModelAssetPath);
    const std::string sceneAssetPath =
        ParseArgValue(argc, argv, "--scene-asset", kDefaultSceneAssetPath);
    const fs::path sceneFilePath = projectRoot / fs::path(sceneAssetPath);

    if (!fs::exists(projectRoot) || !fs::is_directory(projectRoot)) {
        std::cerr << "Project root does not exist: " << projectRoot << std::endl;
        return 1;
    }

    Editor::EditorContext context;
    context.SetProjectPath(projectRoot.string());
    context.GetProjectManager().Initialize(projectRoot.string());
    context.GetSceneManager().NewScene(kDefaultSceneName);

    auto& resourceManager = Resources::ResourceManager::Get();
    resourceManager.Initialize();
    resourceManager.SetResourceRoot(projectRoot.string().c_str());

    auto* camera = context.GetSceneManager().CreateEntity("Preview Camera");
    auto* keyLight = context.GetSceneManager().CreateEntity("Key Light");
    auto* fillLight = context.GetSceneManager().CreateEntity("Fill Light");
    auto* ground = context.GetSceneManager().CreateEntity("Ground");
    auto* avatarRoot = context.GetSceneManager().CreateEntity("AvatarRoot");
    if (camera == nullptr || keyLight == nullptr || fillLight == nullptr || ground == nullptr || avatarRoot == nullptr) {
        std::cerr << "Failed to create preview scene entities." << std::endl;
        return 1;
    }

    ConfigurePreviewCamera(*camera);
    ConfigureKeyLight(*keyLight);
    ConfigureFillLight(*fillLight);
    ConfigureGround(*ground);
    avatarRoot->GetTransform()->SetLocalPosition(Math::Vector3::Zero());
    avatarRoot->GetTransform()->SetLocalRotation(Math::Quaternion::Identity());
    avatarRoot->GetTransform()->SetLocalScale(Math::Vector3::One());

    const auto modelItem = MakeModelAssetItem(projectRoot, modelAssetPath);
    auto* createdRoot = Editor::Commands::InstantiateModelAsset(
        context,
        modelItem,
        avatarRoot,
        "Instantiate Nahida Preview Model");
    if (createdRoot == nullptr) {
        std::cerr << "Failed to instantiate model asset: " << modelAssetPath << std::endl;
        return 1;
    }

    createdRoot->SetName("NahidaUnityModel");

    if (!context.GetSceneManager().SaveSceneAs(sceneFilePath.string())) {
        std::cerr << "Failed to save scene: " << sceneFilePath << std::endl;
        return 1;
    }

    resourceManager.UnloadAll();
    resourceManager.SetResourceRoot("");
    resourceManager.Shutdown();

    std::cout << "Generated scene: " << sceneFilePath << std::endl;
    std::cout << "Model asset: " << modelAssetPath << std::endl;
    return 0;
}