using GFramework.Core.Abstractions.Command;
using GFramework.Core.Abstractions.Environment;
using GFramework.Core.Abstractions.Events;
using GFramework.Core.Abstractions.Model;
using GFramework.Core.Abstractions.Query;
using GFramework.Core.Abstractions.System;
using GFramework.Core.Abstractions.Utility;
using Mediator;
using ICommand = GFramework.Core.Abstractions.Command.ICommand;

namespace GFramework.Core.Abstractions.Architecture;

/// <summary>
///     架构上下文接口，提供对系统、模型、工具类的访问以及命令、查询、事件的发送和注册功能
/// </summary>
public interface IArchitectureContext
{
    /// <summary>
    ///     获取指定类型的服务实例
    /// </summary>
    /// <typeparam name="TService">服务类型</typeparam>
    /// <returns>服务实例，如果不存在则返回null</returns>
    TService? GetService<TService>() where TService : class;

    /// <summary>
    ///     获取指定类型的所有服务实例
    /// </summary>
    /// <typeparam name="TService">服务类型</typeparam>
    /// <returns>所有符合条件的服务实例列表</returns>
    IReadOnlyList<TService> GetServices<TService>() where TService : class;

    /// <summary>
    ///     获取指定类型的系统实例
    /// </summary>
    /// <typeparam name="TSystem">系统类型，必须继承自ISystem接口</typeparam>
    /// <returns>系统实例，如果不存在则返回null</returns>
    TSystem? GetSystem<TSystem>() where TSystem : class, ISystem;

    /// <summary>
    ///     获取指定类型的所有系统实例
    /// </summary>
    /// <typeparam name="TSystem">系统类型，必须继承自ISystem接口</typeparam>
    /// <returns>所有符合条件的系统实例列表</returns>
    IReadOnlyList<TSystem> GetSystems<TSystem>() where TSystem : class, ISystem;

    /// <summary>
    ///     获取指定类型的模型实例
    /// </summary>
    /// <typeparam name="TModel">模型类型，必须继承自IModel接口</typeparam>
    /// <returns>模型实例，如果不存在则返回null</returns>
    TModel? GetModel<TModel>() where TModel : class, IModel;

    /// <summary>
    ///     获取指定类型的所有模型实例
    /// </summary>
    /// <typeparam name="TModel">模型类型，必须继承自IModel接口</typeparam>
    /// <returns>所有符合条件的模型实例列表</returns>
    IReadOnlyList<TModel> GetModels<TModel>() where TModel : class, IModel;

    /// <summary>
    ///     获取指定类型的工具类实例
    /// </summary>
    /// <typeparam name="TUtility">工具类类型，必须继承自IUtility接口</typeparam>
    /// <returns>工具类实例，如果不存在则返回null</returns>
    TUtility? GetUtility<TUtility>() where TUtility : class, IUtility;

    /// <summary>
    ///     获取指定类型的所有工具类实例
    /// </summary>
    /// <typeparam name="TUtility">工具类类型，必须继承自IUtility接口</typeparam>
    /// <returns>所有符合条件的工具类实例列表</returns>
    IReadOnlyList<TUtility> GetUtilities<TUtility>() where TUtility : class, IUtility;

    /// <summary>
    ///     获取指定类型的所有服务实例，并按优先级排序
    ///     实现 IPrioritized 接口的服务将按优先级排序（数值越小优先级越高）
    /// </summary>
    /// <typeparam name="TService">服务类型</typeparam>
    /// <returns>按优先级排序后的服务实例列表</returns>
    IReadOnlyList<TService> GetServicesByPriority<TService>() where TService : class;

    /// <summary>
    ///     获取指定类型的所有系统实例，并按优先级排序
    ///     实现 IPrioritized 接口的系统将按优先级排序（数值越小优先级越高）
    /// </summary>
    /// <typeparam name="TSystem">系统类型，必须继承自ISystem接口</typeparam>
    /// <returns>按优先级排序后的系统实例列表</returns>
    IReadOnlyList<TSystem> GetSystemsByPriority<TSystem>() where TSystem : class, ISystem;

    /// <summary>
    ///     获取指定类型的所有模型实例，并按优先级排序
    ///     实现 IPrioritized 接口的模型将按优先级排序（数值越小优先级越高）
    /// </summary>
    /// <typeparam name="TModel">模型类型，必须继承自IModel接口</typeparam>
    /// <returns>按优先级排序后的模型实例列表</returns>
    IReadOnlyList<TModel> GetModelsByPriority<TModel>() where TModel : class, IModel;

    /// <summary>
    ///     获取指定类型的所有工具类实例，并按优先级排序
    ///     实现 IPrioritized 接口的工具将按优先级排序（数值越小优先级越高）
    /// </summary>
    /// <typeparam name="TUtility">工具类类型，必须继承自IUtility接口</typeparam>
    /// <returns>按优先级排序后的工具类实例列表</returns>
    IReadOnlyList<TUtility> GetUtilitiesByPriority<TUtility>() where TUtility : class, IUtility;

    /// <summary>
    ///     发送一个命令
    /// </summary>
    /// <param name="command">要发送的命令</param>
    void SendCommand(ICommand command);

    /// <summary>
    ///     发送一个带返回值的命令
    /// </summary>
    /// <typeparam name="TResult">命令执行结果类型</typeparam>
    /// <param name="command">要发送的命令</param>
    /// <returns>命令执行结果</returns>
    TResult SendCommand<TResult>(Command.ICommand<TResult> command);

    /// <summary>
    /// [Mediator] 发送命令的同步版本（不推荐，仅用于兼容性）
    /// </summary>
    /// <typeparam name="TResponse">命令响应类型</typeparam>
    /// <param name="command">要发送的命令对象</param>
    /// <returns>命令执行结果</returns>
    TResponse SendCommand<TResponse>(Mediator.ICommand<TResponse> command);


    /// <summary>
    ///     发送并异步执行一个命令
    /// </summary>
    /// <param name="command">要发送的命令</param>
    Task SendCommandAsync(IAsyncCommand command);

    /// <summary>
    /// [Mediator] 异步发送命令并返回结果
    /// 通过Mediator模式发送命令请求，支持取消操作
    /// </summary>
    /// <typeparam name="TResponse">命令响应类型</typeparam>
    /// <param name="command">要发送的命令对象</param>
    /// <param name="cancellationToken">取消令牌，用于取消操作</param>
    /// <returns>包含命令执行结果的ValueTask</returns>
    ValueTask<TResponse> SendCommandAsync<TResponse>(Mediator.ICommand<TResponse> command,
        CancellationToken cancellationToken = default);


    /// <summary>
    ///     发送并异步执行一个带返回值的命令
    /// </summary>
    /// <typeparam name="TResult">命令执行结果类型</typeparam>
    /// <param name="command">要发送的命令</param>
    /// <returns>命令执行结果</returns>
    Task<TResult> SendCommandAsync<TResult>(IAsyncCommand<TResult> command);

    /// <summary>
    ///     发送一个查询请求
    /// </summary>
    /// <typeparam name="TResult">查询结果类型</typeparam>
    /// <param name="query">要发送的查询</param>
    /// <returns>查询结果</returns>
    TResult SendQuery<TResult>(Query.IQuery<TResult> query);

    /// <summary>
    /// [Mediator] 发送查询的同步版本（不推荐，仅用于兼容性）
    /// </summary>
    /// <typeparam name="TResponse">查询响应类型</typeparam>
    /// <param name="query">要发送的查询对象</param>
    /// <returns>查询结果</returns>
    TResponse SendQuery<TResponse>(Mediator.IQuery<TResponse> query);

    /// <summary>
    ///     异步发送一个查询请求
    /// </summary>
    /// <typeparam name="TResult">查询结果类型</typeparam>
    /// <param name="query">要发送的异步查询</param>
    /// <returns>查询结果</returns>
    Task<TResult> SendQueryAsync<TResult>(IAsyncQuery<TResult> query);

    /// <summary>
    /// [Mediator] 异步发送查询并返回结果
    /// 通过Mediator模式发送查询请求，支持取消操作
    /// </summary>
    /// <typeparam name="TResponse">查询响应类型</typeparam>
    /// <param name="query">要发送的查询对象</param>
    /// <param name="cancellationToken">取消令牌，用于取消操作</param>
    /// <returns>包含查询结果的ValueTask</returns>
    ValueTask<TResponse> SendQueryAsync<TResponse>(Mediator.IQuery<TResponse> query,
        CancellationToken cancellationToken = default);

    /// <summary>
    ///     发送一个事件
    /// </summary>
    /// <typeparam name="TEvent">事件类型，必须具有无参构造函数</typeparam>
    void SendEvent<TEvent>() where TEvent : new();

    /// <summary>
    ///     发送一个带参数的事件
    /// </summary>
    /// <typeparam name="TEvent">事件类型</typeparam>
    /// <param name="e">事件参数</param>
    void SendEvent<TEvent>(TEvent e) where TEvent : class;

    /// <summary>
    ///     注册事件处理器
    /// </summary>
    /// <typeparam name="TEvent">事件类型</typeparam>
    /// <param name="handler">事件处理委托</param>
    /// <returns>事件注销接口</returns>
    IUnRegister RegisterEvent<TEvent>(Action<TEvent> handler);

    /// <summary>
    ///     取消注册事件监听器
    /// </summary>
    /// <typeparam name="TEvent">事件类型</typeparam>
    /// <param name="onEvent">要取消注册的事件回调方法</param>
    void UnRegisterEvent<TEvent>(Action<TEvent> onEvent);

    /// <summary>
    /// 发送请求（统一处理 Command/Query）
    /// </summary>
    ValueTask<TResponse> SendRequestAsync<TResponse>(
        IRequest<TResponse> request,
        CancellationToken cancellationToken = default);

    /// <summary>
    /// 发送请求（同步版本，不推荐）
    /// </summary>
    TResponse SendRequest<TResponse>(IRequest<TResponse> request);

    /// <summary>
    /// 发布通知（一对多事件）
    /// </summary>
    ValueTask PublishAsync<TNotification>(
        TNotification notification,
        CancellationToken cancellationToken = default)
        where TNotification : INotification;

    /// <summary>
    /// 创建流式请求（用于大数据集）
    /// </summary>
    IAsyncEnumerable<TResponse> CreateStream<TResponse>(
        IStreamRequest<TResponse> request,
        CancellationToken cancellationToken = default);

    // === 便捷扩展方法 ===

    /// <summary>
    /// 发送命令（无返回值）
    /// </summary>
    ValueTask SendAsync<TCommand>(
        TCommand command,
        CancellationToken cancellationToken = default)
        where TCommand : IRequest<Unit>;

    /// <summary>
    /// 发送命令（有返回值）
    /// </summary>
    ValueTask<TResponse> SendAsync<TResponse>(
        IRequest<TResponse> command,
        CancellationToken cancellationToken = default);


    /// <summary>
    ///     获取环境对象
    /// </summary>
    /// <returns>环境对象实例</returns>
    IEnvironment GetEnvironment();
}