using System.Collections.Concurrent;

namespace SKMC.Api.Common.Tasks
{
    /// <summary>
    /// TaskToken（任务执行控制令牌）容器
    /// 用于管理多个TaskToken相关的线程执行暂停、恢复、停止
    /// </summary>
    public class TaskTokener
    {

        private static readonly ConcurrentDictionary<int, TaskToken> taskTokens = new ConcurrentDictionary<int, TaskToken>();

        /// <summary>
        /// 创建一个TaskToken
        /// </summary>
        /// <param name="id">TaskToken的Id</param>
        public static TaskToken Add(int id)
        {
            if (taskTokens.ContainsKey(id))
            {
                taskTokens.TryRemove(id, out var taskTokenGet);
                taskTokenGet?.Cancel();
            };
            TaskToken taskTokenNew = new TaskToken { Id = id };
            bool result = taskTokens.TryAdd(id, taskTokenNew);
            if (result) return taskTokenNew;
            return null;
        }

        /// <summary>
        /// 重新创建所有的TaskToken
        /// </summary>
        public static void AddAll()
        {
            foreach (int stationId in taskTokens.Keys)
            {
                TaskToken taskToken = GetTaskToken(stationId);
                if (taskToken == null) continue;
                Add(stationId);
            }
        }

        /// <summary>
        /// 根据Id获取TaskToken
        /// </summary>
        /// <param name="id">TaskToken的Id</param>
        /// <returns></returns>
        public static TaskToken GetTaskToken(int id)
        {
            if (!taskTokens.ContainsKey(id))
            {
                Add(id);
            }
            return taskTokens[id];
        }

        /// <summary>
        /// 设置TaskToken中断点(在Stop之前有效)
        /// </summary>
        /// <param name="id"></param>
        public static void SetWaitPoint(int id) => SetWaitPoint(GetTaskToken(id));

        /// <summary>
        /// 设置TaskToken中断点(在Stop之前有效)
        /// </summary>
        /// <param name="taskToken"></param>
        public static void SetWaitPoint(TaskToken taskToken)
        {
            if (taskToken == null) return;
            taskToken.SetWaitPoint();
        }

        /// <summary>
        /// TaskToken是否已取消/停止
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public static bool IsCancelled(int id) => IsCancelled(GetTaskToken(id));

        /// <summary>
        /// TaskToken是否已取消/停止
        /// </summary>
        /// <param name="taskToken"></param>
        /// <returns></returns>
        public static bool IsCancelled(TaskToken taskToken)
        {
            if (taskToken == null) return true;
            return taskToken.IsCancelled();
        }

        /// <summary>
        /// 暂停TaskToken
        /// </summary>
        /// <param name="id"></param>
        public static void Pause(int id) => Pause(GetTaskToken(id));

        /// <summary>
        /// 暂停TaskToken
        /// </summary>
        /// <param name="taskToken"></param>
        public static void Pause(TaskToken taskToken)
        {
            if (taskToken == null) return;
            taskToken.Pause();
        }

        /// <summary>
        /// 暂停所有的TaskToken
        /// </summary>
        public static void PauseAll()
        {
            foreach (int stationId in taskTokens.Keys)
            {
                Pause(stationId);
            }
        }

        /// <summary>
        /// 恢复TaskToken
        /// </summary>
        /// <param name="id"></param>
        public static void Resume(int id) => Resume(GetTaskToken(id));

        /// <summary>
        /// 恢复TaskToken
        /// </summary>
        /// <param name="taskToken"></param>
        public static void Resume(TaskToken taskToken)
        {
            if (taskToken == null) return;
            taskToken.Resume();
        }

        /// <summary>
        /// 恢复所有的TaskToken
        /// </summary>
        public static void ResumeAll()
        {
            foreach (int station in taskTokens.Keys)
            {
                Resume(station);
            }
        }

        /// <summary>
        /// 停止TaskToken
        /// </summary>
        /// <param name="id"></param>
        public static void Stop(int id) => Stop(GetTaskToken(id));

        /// <summary>
        /// 停止TaskToken
        /// </summary>
        /// <param name="taskToken"></param>
        public static void Stop(TaskToken taskToken)
        {
            if (taskToken == null) return;
            taskToken.Stop();
            //taskTokens.TryRemove(taskToken.Id, out _);
        }

        /// <summary>
        /// 停止所有的TaskToken
        /// </summary>
        public static void StopAll()
        {
            foreach (int stationId in taskTokens.Keys)
            {
                Stop(stationId);
            }
        }    
    }
}