using BBWYB.Common.Models;
using BBWYB.Server.Model;

namespace BBWYB.Server.Business
{
    public class TimeLimitRules : IDenpendency
    {
        /// <summary>
        /// 计算到期时间算法字典
        /// </summary>
        private IDictionary<Enums.TimeLimitTaskType, Func<DateTime, DateTime>> calculateExpirationTimeAlgorithmDictionary;

        public TimeLimitRules()
        {
            calculateExpirationTimeAlgorithmDictionary = new Dictionary<Enums.TimeLimitTaskType, Func<DateTime, DateTime>>()
            {
                { Enums.TimeLimitTaskType.采购任务, CalculateExpirationTimeFor5WorkHour },
                { Enums.TimeLimitTaskType.合格证拟定任务, CalculateExpirationTimeFor8WorkHour },
                { Enums.TimeLimitTaskType.待核算任务, CalculateExpirationTimeFor8WorkHour },
                { Enums.TimeLimitTaskType.待议价任务, CalculateExpirationTimeFor8WorkHour },
                { Enums.TimeLimitTaskType.合格证补充任务, CalculateExpirationTimeFor2WorkHour }
            };
        }

        /// <summary>
        /// 计算到期时间
        /// </summary>
        /// <param name="timeLimitTaskType">任务类型</param>
        /// <param name="startTime">起点计算时间</param>
        /// <returns></returns>
        public DateTime CalculateExpirationTime(Enums.TimeLimitTaskType timeLimitTaskType, DateTime startTime)
        {
            return calculateExpirationTimeAlgorithmDictionary[timeLimitTaskType](startTime);
        }

        /// <summary>
        /// 计算需要追加的天数,周六追加2天,周日追加1天
        /// </summary>
        /// <param name="dayOfWeek"></param>
        /// <returns></returns>
        private int CalculateAddDay(DayOfWeek dayOfWeek)
        {
            if (dayOfWeek == DayOfWeek.Saturday)
                return 2;
            return 1;
        }

        /// <summary>
        /// 8小时工作时计算到期时间
        /// </summary>
        /// <param name="startTime">起点时间</param>
        /// <returns></returns>
        private DateTime CalculateExpirationTimeFor8WorkHour(DateTime startTime)
        {
            int addDay = 0, addHour = 0, addSeconds = 0;
            //先确定是否为周日
            if (startTime.DayOfWeek == DayOfWeek.Sunday)
            {
                addDay = 1;
                addHour = 18;
            }
            else
            {
                if (startTime.Hour < 9)
                    addHour = 18;
                else if (startTime.Hour >= 9 && startTime.Hour < 12)
                {
                    //计算从起点时间的9点开始到当前时间的时差
                    var timeSpan = startTime - startTime.Date.AddHours(9);
                    if (timeSpan.TotalMinutes <= 5)
                    {
                        //从9点开始小于5分钟以内,以当天18点结束
                        addHour = 18;
                    }
                    else
                    {
                        addDay = CalculateAddDay(startTime.DayOfWeek);
                        addHour = 9;
                        addSeconds = (int)timeSpan.TotalSeconds;
                    }
                }
                else if (startTime.Hour >= 12 && startTime.Hour < 13)
                {
                    //下一个工作日的12点结束
                    addDay = CalculateAddDay(startTime.DayOfWeek);
                    addHour = 12;
                }
                else if (startTime.Hour >= 13 && startTime.Hour < 18)
                {
                    var timeSpan = startTime - startTime.Date.AddHours(13);
                    //到下一个工作日的当前时间结束
                    addDay = CalculateAddDay(startTime.DayOfWeek);
                    addHour = 13;
                    addSeconds = (int)timeSpan.TotalSeconds;

                }
                else if (startTime.Hour >= 18)
                {
                    //下一个工作日的18点结束
                    addDay = CalculateAddDay(startTime.DayOfWeek);
                    addHour = 18;
                }
            }
            return startTime.Date.AddDays(addDay).AddHours(addHour).AddSeconds(addSeconds);
        }

        /// <summary>
        /// 2小时工作时计算到期时间
        /// </summary>
        /// <param name="startTime">起点时间</param>
        /// <returns></returns>
        private DateTime CalculateExpirationTimeFor2WorkHour(DateTime startTime)
        {
            int addDay = 0, addHour = 0, addSeconds = 0;
            //先确定是否为周日
            if (startTime.DayOfWeek == DayOfWeek.Sunday)
            {
                addDay = 1;
                addHour = 11;
            }
            else
            {
                if (startTime.Hour < 9)
                    addHour = 11;
                else if (startTime.Hour >= 9 && startTime.Hour < 12)
                {
                    //如果在10点钟以前,则加两个小时
                    if (startTime.Hour < 10)
                    {
                        addHour = 11;
                        addSeconds = Convert.ToInt32((startTime - startTime.Date.AddHours(9)).TotalSeconds);
                    }
                    else
                    {
                        addHour = 13;
                        var to12senconds = Convert.ToInt32((startTime.Date.AddHours(12) - startTime).TotalSeconds);
                        addSeconds = 7200 - to12senconds;
                    }
                }
                else if (startTime.Hour >= 12 && startTime.Hour < 13)
                {
                    addHour = 15;
                }
                else if (startTime.Hour >= 13 && startTime.Hour < 18)
                {
                    if (startTime.Hour < 16)
                    {
                        addHour = startTime.Hour + 2;
                        addSeconds = startTime.Minute * 60 + startTime.Second;
                    }
                    else if (startTime.Hour == 16 && startTime.Minute <= 5)
                    {
                        //从16点开始小于5分钟以内,以当天18点结束
                        addHour = 18;
                    }
                    else
                    {
                        addDay = CalculateAddDay(startTime.DayOfWeek);
                        addHour = 9;
                        var to18senconds = Convert.ToInt32((startTime.Date.AddHours(18) - startTime).TotalSeconds);
                        addSeconds = 7200 - to18senconds;
                    }
                }
                else if (startTime.Hour >= 18)
                {
                    //下一个工作日的18点结束
                    addDay = CalculateAddDay(startTime.DayOfWeek);
                    addHour = 11;
                }
            }
            return startTime.Date.AddDays(addDay).AddHours(addHour).AddSeconds(addSeconds);
        }

        private DateTime CalculateExpirationTimeFor5WorkHour(DateTime startTime)
        {
            int addDay = 0, addHour = 0, addSeconds = 0;
            //先确定是否为周日
            if (startTime.DayOfWeek == DayOfWeek.Sunday)
            {
                addDay = 1;
                addHour = 15;
            }
            else
            {
                if (startTime.Hour < 9)
                    addHour = 15;
                else if (startTime.Hour >= 9 && startTime.Hour < 12)
                {
                    addHour = 13;
                    var to12senconds = Convert.ToInt32((startTime.Date.AddHours(12) - startTime).TotalSeconds);
                    addSeconds = 18000 - to12senconds;
                }
                else if (startTime.Hour >= 12 && startTime.Hour < 13)
                {
                    addHour = 18;
                }
                else if (startTime.Hour >= 13 && startTime.Hour < 18)
                {
                    if (startTime.Hour == 13 && startTime.Minute <= 5)
                    {
                        //从16点开始小于5分钟以内,以当天18点结束
                        addHour = 18;
                    }
                    else
                    {
                        addDay = CalculateAddDay(startTime.DayOfWeek);
                        addHour = 9;
                        var to18senconds = Convert.ToInt32((startTime.Date.AddHours(18) - startTime).TotalSeconds);
                        addSeconds = 18000 - to18senconds;
                        if (addSeconds > 10800)
                        {
                            //到第二天9点开始也超过3个小时，就从下午13点开始计算
                            addHour = 13;
                            addSeconds -= 10800;
                        }
                    }
                }
                else if (startTime.Hour >= 18)
                {
                    //下一个工作日的18点结束
                    addDay = CalculateAddDay(startTime.DayOfWeek);
                    addHour = 15;
                }
            }
            return startTime.Date.AddDays(addDay).AddHours(addHour).AddSeconds(addSeconds);
        }

        /// <summary>
        /// 计算剩余任务时间(秒)
        /// </summary>
        /// <param name="expirationTime"></param>
        /// <returns></returns>
        public long CalculateLessTimeForWorkHour(DateTime expirationTime)
        {
            if (DateTime.Now >= expirationTime)
                return 0;

            //强制过期时间在工作时间点内
            if (expirationTime.Hour < 9)
                expirationTime = expirationTime.Date.AddHours(9);
            else if (expirationTime.Hour >= 12 && expirationTime.Minute > 0 && expirationTime.Hour < 13)  //排除整点结束的到期时间
                expirationTime = expirationTime.Date.AddHours(12);
            else if (expirationTime.Hour >= 18 && expirationTime.Minute > 0)  //排除整点结束的到期时间
                expirationTime = expirationTime.Date.AddDays(CalculateAddDay(expirationTime.DayOfWeek)).AddHours(9);

            var startTime = DateTime.Now;
            long lessTime = 0;
            while (true)
            {
                //把非工作时间段转换成工作时间段
                if (startTime.DayOfWeek == DayOfWeek.Sunday)
                {
                    startTime = startTime.Date.AddDays(1).AddHours(9);
                }
                else
                {
                    if (startTime.Hour < 9)
                        startTime = startTime.Date.AddHours(9);
                    else if (startTime.Hour >= 12 && startTime.Hour < 13)
                        startTime = startTime.Date.AddHours(13);
                    else if (startTime.Hour >= 18 && startTime.Minute > 0)
                        startTime = startTime.Date.AddDays(CalculateAddDay(startTime.DayOfWeek)).AddHours(9);
                }

                //计算上午工作时间段
                if (startTime.Hour >= 9 && startTime.Hour < 12)
                {
                    if (expirationTime <= startTime.Date.AddHours(12))
                    {
                        lessTime += Convert.ToInt32((expirationTime - startTime).TotalSeconds);
                        break;
                    }
                    else
                    {
                        lessTime += 10800;
                        startTime = startTime.Date.AddHours(13);
                    }
                }

                //计算下午工作时间段
                if (startTime.Hour >= 13 && startTime.Hour < 18)
                {
                    if (expirationTime <= startTime.Date.AddHours(18))
                    {
                        lessTime += Convert.ToInt32((expirationTime - startTime).TotalSeconds);
                        break;
                    }
                    else
                    {
                        lessTime += 18000;
                        startTime = startTime.Date.AddDays(CalculateAddDay(startTime.DayOfWeek)).AddHours(9);
                    }
                }
            }
            return lessTime;
        }
    }
}