using Models;

namespace Core;

/// <summary>
/// 游戏会话（运行时入口）
/// 设计说明：
/// 1) 将 State + Content + Systems + Services 组织为一个整体。
/// 2) 便于在 Godot Node 中持有，避免散落的静态单例。
/// 注意事项：
/// - 真实项目中应通过工厂或依赖注入创建。
/// 未来扩展：
/// - 可加入“加载存档/保存存档/重置”接口。
/// </summary>
public sealed class GameSession
{
    /// <summary>
    /// 游戏状态
    /// </summary>
	public GameState State { get; }
    /// <summary>
    /// 游戏内容数据库
    /// </summary>
	public GameContentDatabase Content { get; }
    /// <summary>
    /// 领域事件总线
    /// </summary>
	public DomainEventBus Events { get; }
    /// <summary>
    /// 本地化服务
    /// </summary>
	public ILocalizationService Localization { get; }
    /// <summary>
    /// 游戏系统集合
    /// </summary>
	public GameSystems Systems { get; }

    /// <summary>
    /// 构造游戏会话
    /// </summary>
    /// <param name="state">游戏状态</param>
    /// <param name="content">内容数据库</param>
    /// <param name="localization">本地化服务</param>
    /// <param name="events">事件总线</param>
	public GameSession(GameState state, GameContentDatabase content, ILocalizationService localization, DomainEventBus events)
	{
		State = state;
		Content = content;
		Localization = localization;
		Events = events;
		Systems = new GameSystems();
		Systems.Initialize(this);
	}

    /// <summary>
    /// 创建默认游戏会话
    /// </summary>
    /// <returns>游戏会话实例</returns>
	public static GameSession CreateDefault()
	{
		var registry = new ContentRegistry();
		var resourceSource = new ResourceContentSource(0);
		resourceSource.ResourcePaths.Add("res://resources/definitions/discipline_biology.tres");
		registry.RegisterSource(resourceSource);

		var jsonSource = new JsonContentSource(10);
		jsonSource.DataPaths.Add("res://resources/definitions/disciplines.json");
		jsonSource.DataPaths.Add("res://resources/definitions/archetypes.json");
		jsonSource.DataPaths.Add("res://resources/definitions/roles.json");
		jsonSource.DataPaths.Add("res://resources/definitions/traits.json");
		registry.RegisterSource(jsonSource);

		var content = registry.BuildDatabase();
		var localization = new GodotLocalizationService();
		var events = new DomainEventBus();
		return new GameSession(new GameState(), content, localization, events);
	}

    /// <summary>
    /// 每帧更新
    /// </summary>
    /// <param name="delta">帧间隔</param>
	public void Tick(float delta)
	{
		Systems.Tick(delta);
	}
}