using System.Collections.Concurrent;

namespace YLErp.Helpers
{
    //public enum ProgressName
    //{
    //    ClientBalanceReport
    //}

    public static class ProgressHelper<T>
    {

        static ConcurrentDictionary<string, ProgressInfo<T>> goingTasks = new ConcurrentDictionary<string, ProgressInfo<T>>();
        private static readonly object _asyncLock = new object();

        public static bool Start(IEnumerable<T> inputList, string key, Func<T, string> callback)
        {
            lock (_asyncLock)
            {
                if (goingTasks.TryGetValue(key, out var ret) && ret.status == ProgressBarStatus.IDLE)
                {
                    goingTasks.TryRemove(key, out _);
                }
                if (goingTasks.TryAdd(key, new ProgressInfo<T>(inputList, callback)))
                {
                    return true;
                }
                return false;
            }
        }

        public static bool Start(IEnumerable<T> inputList, string key, Func<T, object, string> callback, object extendParams)
        {
            lock (_asyncLock)
            {
                if (goingTasks.TryGetValue(key, out var ret) && ret.status == ProgressBarStatus.IDLE)
                {
                    goingTasks.TryRemove(key, out _);
                }
                if (goingTasks.TryAdd(key, new ProgressInfo<T>(inputList, callback, extendParams)))
                {
                    return true;
                }
                return false;
            }
        }

        public static bool Start(IEnumerable<T> inputList, string key, Func<T, object, string> callback, Func<object, object> finalFunc, object extendParams)
        {
            lock (_asyncLock)
            {
                if (goingTasks.TryGetValue(key, out var ret) && ret.status == ProgressBarStatus.IDLE)
                {
                    goingTasks.TryRemove(key, out _);
                }
                if (goingTasks.TryAdd(key, new ProgressInfo<T>(inputList, callback, finalFunc, extendParams)))
                {
                    return true;
                }
                return false;
            }
        }

        public static bool Start(IEnumerable<T> inputList, string key, Func<T, object, ProgressInfo<T>, string> callback, Func<object, object> finalFunc, object extendParams)
        {
            lock (_asyncLock)
            {
                if (goingTasks.TryAdd(key, new ProgressInfo<T>(inputList, callback, finalFunc, extendParams)))
                {
                    return true;
                }
                return false;
            }
        }

        public static ProgressInfo<T> ObservateProcess(string key)
        {
            if (goingTasks.ContainsKey(key))
            {

                var ret = goingTasks[key];
                if (ret.status == ProgressBarStatus.IDLE)
                {
                    goingTasks.TryRemove(key, out ret);
                }
                return ret;
            }
            else
            {
                return null;
            }
        }

        public static bool Stop(string key)
        {
            if (goingTasks.ContainsKey(key))
            {

                var ret = goingTasks[key];
                if (ret.status == ProgressBarStatus.IDLE)
                {
                }
                else
                {
                    ret.status = ProgressBarStatus.STOPPING;
                }
                goingTasks.TryRemove(key, out _);
                return true;
            }
            else
            {
                return false;
            }
        }
    }

    public class ProgressInfo<T>
    {
        public int total { get; private set; }
        public int done { get; private set; }
        public List<string> message { get; private set; }
        public ProgressBarStatus status { get; set; }

        public bool ignoreIndex { get; set; }

        /// <summary>
        /// 保存 finalFunc 的返回值,传到前端;
        /// </summary>
        public object resultObj { get; private set; }

        public ProgressInfo(IEnumerable<T> goings, Func<T, string> del)
        {
            this.total = goings.Count();
            this.done = 0;
            this.status = ProgressBarStatus.RUNNING;
            message = new List<string>();
            Thread th = new Thread(() => DoProgress(goings, del));
            th.Start();
        }

        public ProgressInfo(IEnumerable<T> goings, Func<T, object, string> del, object extendParams)
        {
            this.total = goings.Count();
            this.done = 0;
            this.status = ProgressBarStatus.RUNNING;
            message = new List<string>();
            Thread th = new Thread(() => DoProgress(goings, del, extendParams));
            th.Start();
        }

        public ProgressInfo(IEnumerable<T> goings, Func<T, object, string> del, Func<object, object> final, object extendParams)
        {
            this.total = goings.Count();
            this.done = 0;
            this.status = ProgressBarStatus.RUNNING;
            message = new List<string>();
            Thread th = new Thread(() => DoProgress(goings, del, final, extendParams));
            th.Start();
        }

        public ProgressInfo(IEnumerable<T> goings, Func<T, object, ProgressInfo<T>, string> del, Func<object, object> final, object extendParams)
        {
            this.total = goings.Count();
            this.done = 0;
            this.status = ProgressBarStatus.RUNNING;
            message = new List<string>();
            Thread th = new Thread(() => DoProgress(goings, del, final, extendParams));
            th.Start();
        }
        void DoProgress(IEnumerable<T> input, Func<T, string> callback)
        {
            try
            {
                foreach (var item in input)
                {
                    if (this.status != ProgressBarStatus.RUNNING)
                    {
                        break;
                    }
                    try
                    {
                        this.message.Add(callback(item));
                    }
                    catch (Exception ex) { LogFactory.GetLogger("ProgressHelper").Error(ex); }
                    if (this.done < this.total)
                    {
                        this.done++;
                    }
                }
            }
            catch (Exception ex)
            {
                LogFactory.GetLogger("ProgressHelper").Error("进度无法继续：" + ex.Message);
            }
            finally
            {
                this.status = ProgressBarStatus.IDLE;
            }
        }

        void DoProgress(IEnumerable<T> input, Func<T, object, string> callback, object extendParams)
        {
            try
            {
                foreach (var item in input)
                {
                    if (this.status != ProgressBarStatus.RUNNING)
                    {
                        break;
                    }
                    try
                    {
                        this.message.Add(callback(item, extendParams));
                    }
                    catch (Exception ex) { LogFactory.GetLogger("ProgressHelper").Error(ex); }
                    if (this.done < this.total)
                    {
                        this.done++;
                    }
                }
            }
            catch (Exception ex)
            {
                LogFactory.GetLogger("ProgressHelper").Error("进度无法继续：" + ex.Message);
            }
            finally
            {
                this.status = ProgressBarStatus.IDLE;
            }
        }

        void DoProgress(IEnumerable<T> input, Func<T, object, string> callback, Func<object, object> finalFunc, object extendParams)
        {
            try
            {
                foreach (var item in input)
                {
                    if (this.status != ProgressBarStatus.RUNNING)
                    {
                        break;
                    }
                    try
                    {
                        this.message.Add(callback(item, extendParams));
                    }
                    catch (Exception ex) { LogFactory.GetLogger("ProgressHelper").Error(ex); }
                    if (this.done < this.total)
                    {
                        this.done++;
                    }
                }
            }
            catch (Exception ex)
            {
                LogFactory.GetLogger("ProgressHelper").Error("进度无法继续：" + ex.Message);
            }
            finally
            {
                try
                {
                    if (this.status == ProgressBarStatus.RUNNING)
                    {
                        resultObj = finalFunc(extendParams);
                    }
                }
                catch (Exception e)
                {
                    LogFactory.GetLogger("ProgressHelper").Error("进度完成时出错：" + e.Message);
                }
                finally
                {
                    this.status = ProgressBarStatus.IDLE;
                }
            }
        }

        void DoProgress(IEnumerable<T> input, Func<T, object, ProgressInfo<T>, string> callback, Func<object, object> finalFunc, object extendParams)
        {
            try
            {
                foreach (var item in input)
                {
                    if (this.status != ProgressBarStatus.RUNNING)
                    {
                        break;
                    }
                    try
                    {
                        this.message.Add(callback(item, extendParams, this));
                    }
                    catch (Exception ex) { LogFactory.GetLogger("ProgressHelper").Error(ex); }
                    if (this.ignoreIndex)
                    {
                        this.message.Add(callback(item, extendParams, this));
                    }
                    if (this.done < this.total)
                    {
                        this.done++;
                    }
                }
            }
            catch (Exception ex)
            {
                LogFactory.GetLogger("ProgressHelper").Error("进度无法继续：" + ex.Message);
            }
            finally
            {
                try
                {
                    if (this.status == ProgressBarStatus.RUNNING)
                    {
                        resultObj = finalFunc(extendParams);
                    }
                }
                catch (Exception e)
                {
                    LogFactory.GetLogger("ProgressHelper").Error("进度完成时出错：" + e.Message);
                }
                finally
                {
                    this.status = ProgressBarStatus.IDLE;
                }
            }
        }
    }

    public enum ProgressBarStatus
    {
        /// <summary>
        /// 空闲
        /// </summary>
        IDLE,
        /// <summary>
        /// 运行中
        /// </summary>
        RUNNING,
        /// <summary>
        /// 停止中
        /// </summary>
        STOPPING,
    }
}