using System.Collections.Generic;
using System.Threading.Tasks;
using WIDESEAWCS_S7Simulator.Core.Entities;
using WIDESEAWCS_S7Simulator.Core.Enums;

namespace WIDESEAWCS_S7Simulator.Core.Interfaces
{
    /// <summary>
    /// 仿真器实例管理器接口
    /// 管理多个S7服务器实例的生命周期
    /// </summary>
    public interface ISimulatorInstanceManager
    {
        /// <summary>
        /// 实例状态变化事件
        /// </summary>
        event EventHandler<InstanceStateChangedEventArgs>? InstanceStateChanged;

        /// <summary>
        /// 获取所有实例
        /// </summary>
        /// <returns>实例列表</returns>
        IReadOnlyList<IS7ServerInstance> GetAllInstances();

        /// <summary>
        /// 根据ID获取实例
        /// </summary>
        /// <param name="instanceId">实例ID</param>
        /// <returns>实例，不存在则返回null</returns>
        IS7ServerInstance? GetInstance(string instanceId);

        /// <summary>
        /// 检查实例是否存在
        /// </summary>
        /// <param name="instanceId">实例ID</param>
        /// <returns>是否存在</returns>
        bool InstanceExists(string instanceId);

        /// <summary>
        /// 创建新实例
        /// </summary>
        /// <param name="config">实例配置</param>
        /// <returns>创建的实例</returns>
        Task<IS7ServerInstance> CreateInstanceAsync(InstanceConfig config);

        /// <summary>
        /// 启动实例
        /// </summary>
        /// <param name="instanceId">实例ID</param>
        /// <returns>是否成功</returns>
        Task<bool> StartInstanceAsync(string instanceId);

        /// <summary>
        /// 停止实例
        /// </summary>
        /// <param name="instanceId">实例ID</param>
        Task StopInstanceAsync(string instanceId);

        /// <summary>
        /// 重启实例
        /// </summary>
        /// <param name="instanceId">实例ID</param>
        /// <returns>是否成功</returns>
        Task<bool> RestartInstanceAsync(string instanceId);

        /// <summary>
        /// 删除实例
        /// </summary>
        /// <param name="instanceId">实例ID</param>
        /// <param name="deleteConfig">是否删除配置文件</param>
        Task DeleteInstanceAsync(string instanceId, bool deleteConfig = true);

        /// <summary>
        /// 获取实例状态
        /// </summary>
        /// <param name="instanceId">实例ID</param>
        /// <returns>实例状态，不存在则返回null</returns>
        InstanceState? GetInstanceState(string instanceId);

        /// <summary>
        /// 获取所有实例状态
        /// </summary>
        /// <returns>实例状态列表</returns>
        IReadOnlyList<InstanceState> GetAllInstanceStates();

        /// <summary>
        /// 加载所有已保存的实例
        /// </summary>
        /// <param name="autoStart">是否自动启动标记为AutoStart的实例</param>
        Task LoadSavedInstancesAsync(bool autoStart = true);

        /// <summary>
        /// 停止所有实例
        /// </summary>
        Task StopAllInstancesAsync();

        /// <summary>
        /// 获取运行中的实例数量
        /// </summary>
        int GetRunningInstanceCount();

        /// <summary>
        /// 获取实例总数
        /// </summary>
        int GetTotalInstanceCount();
    }

    /// <summary>
    /// 实例状态变化事件参数
    /// </summary>
    public class InstanceStateChangedEventArgs : EventArgs
    {
        /// <summary>
        /// 实例ID
        /// </summary>
        public string InstanceId { get; set; } = string.Empty;

        /// <summary>
        /// 旧状态
        /// </summary>
        public InstanceStatus OldStatus { get; set; }

        /// <summary>
        /// 新状态
        /// </summary>
        public InstanceStatus NewStatus { get; set; }

        /// <summary>
        /// 实例状态
        /// </summary>
        public InstanceState InstanceState { get; set; } = new();
    }
}