using GFramework.Core.system;
using Godot;

namespace GFramework.Core.Godot.system;

/// <summary>
/// 资源加载系统接口，提供资源和场景的加载、实例化、预加载等功能
/// </summary>
public interface IResourceLoadSystem : ISystem
{
    /// <summary>
    /// 加载指定路径的资源
    /// </summary>
    /// <typeparam name="T">资源类型，必须继承自Resource</typeparam>
    /// <param name="path">资源路径</param>
    /// <returns>加载的资源实例</returns>
    public T? LoadResource<T>(string path) where T : Resource;
    
    /// <summary>
    /// 获取场景加载器，用于延迟加载场景
    /// </summary>
    /// <param name="path">场景路径</param>
    /// <returns>场景的延迟加载包装器</returns>
    public Lazy<PackedScene> GetSceneLoader(string path);
    /// <summary>
    /// 创建指定路径场景的实例
    /// </summary>
    /// <typeparam name="T">节点类型，必须继承自Node</typeparam>
    /// <param name="path">场景路径</param>
    /// <returns>场景实例化的节点对象</returns>
    public T? CreateInstance<T>(string path) where T : Node;
    

    /// <summary>
    /// 获取或注册场景工厂函数
    /// </summary>
    /// <typeparam name="T">节点类型，必须继承自Node</typeparam>
    /// <param name="id">场景资源标识符</param>
    /// <returns>创建场景实例的工厂函数</returns>
    public Func<T> GetOrRegisterSceneFactory<T>(AssetCatalog.SceneId id) where T : Node;
    
    /// <summary>
    /// 获取或注册资源工厂函数
    /// </summary>
    /// <typeparam name="T">资源类型，必须继承自Node</typeparam>
    /// <param name="id">资源标识符</param>
    /// <param name="duplicate">是否创建副本，默认为false</param>
    /// <returns>创建资源实例的工厂函数</returns>
    public Func<T> GetOrRegisterResourceFactory<T>(AssetCatalog.ResourceId id, bool duplicate = false)
        where T : Resource;

    /// <summary>
    /// 预加载指定路径的多个资源
    /// </summary>
    /// <param name="paths">需要预加载的资源路径集合</param>
    public void Preload(IEnumerable<string> paths);
    
    /// <summary>
    /// 卸载指定路径的资源
    /// </summary>
    /// <param name="path">需要卸载的资源路径</param>
    public void Unload(string path);
    
    /// <summary>
    /// 清除所有已加载的资源
    /// </summary>
    public void ClearAll();
}