using System;
using System.Collections.Generic;
using TEAMModelBI.Models;

namespace TEAMModelBI.Tool
{
    public static class TimeHelper
    {
        /// <summary>
        /// 获取月份的开始和结束时间戳   10位
        /// </summary>
        /// <param name="year"></param>
        /// <param name="month"></param>
        /// <returns></returns>
        public static (long start, long end) GetMonthStartEnd10(int year, int month)
        {
            DateTime dt = DateTime.Parse($"{year}-{month}");
            DateTime dtNew = new DateTime(dt.Year, dt.Month, 1);
            long start = DateTimeOffset.Parse($"{dtNew}").ToUnixTimeSeconds();
            var ste = dtNew.AddMonths(1).AddDays(-1).Day;
            long end = DateTimeOffset.Parse($"{dt.Year}-{dt.Month}-{ste} 23:59:59").ToUnixTimeSeconds();

            return (start, end);
        }

        /// <summary>
        /// 获取月份的开始和结束时间戳   13位
        /// </summary>
        /// <param name="year"></param>
        /// <param name="month"></param>
        /// <returns></returns>
        public static (long start, long end) GetMonthStartEnd13(int year, int month)
        {
            DateTime dt = DateTime.Parse($"{year}-{month}");
            DateTime dtNew = new DateTime(dt.Year, dt.Month, 1);
            long start = DateTimeOffset.Parse($"{dtNew}").ToUnixTimeMilliseconds();
            var ste = dtNew.AddMonths(1).AddDays(-1).Day;
            long end = DateTimeOffset.Parse($"{dt.Year}-{dt.Month}-{ste} 23:59:59").ToUnixTimeMilliseconds();

            return (start, end);
        }

        /// <summary>
        /// 获取今年12个月的月份开始和结束时间戳  10位
        /// </summary>
        /// <param name="year"></param>
        /// <returns></returns>
        public static List<MonthStartEnd> GetYearMonthlyStartEnd10(int year)
        {
            List<MonthStartEnd> monthStartEnds = new List<MonthStartEnd>();
            for (int i = 1; i <= 12; i++)
            {
                MonthStartEnd monthStartEnd = new MonthStartEnd() { yearMonth = $"{year}-{i}" };
                DateTime dt = DateTime.Parse($"{year}-{i}");
                DateTime dtNew = new DateTime(dt.Year, dt.Month, 1);
                long start = DateTimeOffset.Parse($"{dtNew}").ToUnixTimeSeconds();
                monthStartEnd.start = start;
                var ste = dtNew.AddMonths(1).AddDays(-1).Day;
                long end = DateTimeOffset.Parse($"{dt.Year}-{dt.Month}-{ste} 23:59:59").ToUnixTimeSeconds();
                monthStartEnd.end = end;
                monthStartEnds.Add(monthStartEnd);
            }

            return monthStartEnds;
        }

        /// <summary>
        /// 获取今年12个月的月份开始和结束时间戳 13位
        /// </summary>
        /// <param name="year"></param>
        /// <returns></returns>
        public static List<MonthStartEnd> GetYearMonthlyStartEnd13(int year)
        {
            List<MonthStartEnd> monthStartEnds = new List<MonthStartEnd>();
            for (int i = 1; i <= 12; i++)
            {
                MonthStartEnd monthStartEnd = new MonthStartEnd() { yearMonth = $"{year}-{i}" };
                DateTime dt = DateTime.Parse($"{year}-{i}");
                DateTime dtNew = new DateTime(dt.Year, dt.Month, 1);
                long start = DateTimeOffset.Parse($"{dtNew}").ToUnixTimeMilliseconds();
                monthStartEnd.start = start;
                var ste = dtNew.AddMonths(1).AddDays(-1).Day;
                long end = DateTimeOffset.Parse($"{dt.Year}-{dt.Month}-{ste} 23:59:59").ToUnixTimeMilliseconds();
                monthStartEnd.end = end;
                monthStartEnds.Add(monthStartEnd);
            }

            return monthStartEnds;
        }

        /// <summary>
        /// 获取过去12个月的每月开始和结束的时间戳
        /// </summary>
        /// <param name="yearMonth">日期</param>
        /// <param name="dateLenth">true ：13位时间戳  false:10位时间戳</param>
        /// <returns></returns>
        public static List<MonthStartEnd> monthsOfYear(string yearMonth, bool dateLenth = true)
        {
            List<MonthStartEnd> monthStartEnds = new List<MonthStartEnd>();
            DateTime dateTime = DateTime.Parse(yearMonth);
            int year = dateTime.Year;
            int month = dateTime.Month;
            List<string> months = new List<string>();
            while (year > dateTime.Year - 1 || month > dateTime.Month)
            {
                MonthStartEnd monthStartEnd = new MonthStartEnd() { yearMonth = $"{year}-{month}" };

                DateTime dtNew = new DateTime(year, month, 1);
                long start = dateLenth ? DateTimeOffset.Parse($"{dtNew}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{dtNew}").ToUnixTimeSeconds();
                monthStartEnd.start = start;
                var ste = dtNew.AddMonths(1).AddDays(-1).Day;
                long end = dateLenth ? DateTimeOffset.Parse($"{dateTime.Year}-{dateTime.Month}-{ste} 23:59:59").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{dateTime.Year}-{dateTime.Month}-{ste} 23:59:59").ToUnixTimeSeconds();
                monthStartEnd.end = end;

                monthStartEnds.Add(monthStartEnd);
                
                months.Add($"{year}-{(month < 10 ? "0" : "") + month}");
                month -= 1;
                if (month <= 0)
                {
                    year -= 1;
                    month = 12;
                }
            }

            return monthStartEnds;
        }

        /// <summary>
        /// 获取传过来的时间学期的开始时间戳和结束时间  
        /// </summary>
        /// <param name="dateTime">日期</param>
        /// <param name="dateLenth">true ：13位时间戳  false:10位时间戳 </param>
        /// <returns></returns>
        public static (long start, long end) GetTermStartOrEnd(DateTime dateTime, bool dateLenth = true)
        {
            long start = 0; 
            long end = 0;
            //DateTime dateTime = tempDateTime;
            int year = dateTime.Year;
            int month = dateTime.Month;
            if (month <= 8 && month >= 3)
            {
                DateTime newStart = new DateTime(year, 3, 1);
                start = dateLenth ? DateTimeOffset.Parse($"{newStart}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{newStart}").ToUnixTimeSeconds();

                DateTime newEnd = new DateTime(year, 8, 31, 23, 59, 59);
                end = dateLenth ? DateTimeOffset.Parse($"{newEnd}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{newEnd}").ToUnixTimeSeconds();
            }
            else
            {
                //计算当前月份
                int days = 0;
                if (month >= 9)
                {
                    DateTime newStart = new DateTime(dateTime.Year, 9, 1);
                    start = dateLenth ? DateTimeOffset.Parse($"{newStart}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{newStart}").ToUnixTimeSeconds();

                    DateTime newEnd = new DateTime(dateTime.Year + 1, 2, (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) ? days = 29 : days = 28, 23, 59, 59);
                    end = dateLenth ? DateTimeOffset.Parse($"{newEnd}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{newEnd}").ToUnixTimeSeconds();
                }
                else
                {
                    DateTime newStart = new DateTime(dateTime.Year - 1, 9, 1);
                    start = dateLenth ? DateTimeOffset.Parse($"{newStart}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{newStart}").ToUnixTimeSeconds();

                    DateTime newEnd = new DateTime(dateTime.Year, 2, (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) ? days = 29 : days = 28, 23, 59, 59);
                    end = dateLenth ? DateTimeOffset.Parse($"{newEnd}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{newEnd}").ToUnixTimeSeconds();
                }
            }

            return (start, end);
        }


        /// <summary>
        /// 开始时间和结束时间戳
        /// </summary>
        /// <param name="dateTime"></param>
        /// <param name="type"></param>
        /// <param name="dateLenth"></param>
        /// <returns></returns>
        public static (long start, long end) GetStartOrEnd(DateTimeOffset dateTime, string type = "", bool dateLenth = true)
        {
            long start = 0;
            long end = 0;
            DateTimeOffset tempStrart = new();
            DateTimeOffset tempEnt = new();
            switch (type) 
            {
                case "year":
                    tempStrart = new DateTime(dateTime.Year,1, 1);
                    tempEnt = new DateTime(dateTime.Year, 12, DateTime.DaysInMonth(dateTime.Year, 12), 23, 59, 59);
                    break;

                case "term":
                    int year = dateTime.Year;
                    int month = dateTime.Month;
                    if (month <= 8 && month >= 3)
                    {
                        tempStrart = new DateTime(year, 3, 1);
                        tempEnt = new DateTime(year, 8, 31, 23, 59, 59);
                    }
                    else
                    {
                        //计算当前月份
                        int days = 0;
                        if (month >= 9)
                        {
                            tempStrart = new DateTime(dateTime.Year, 9, 1);
                            tempEnt = new DateTime(dateTime.Year + 1, 2, (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) ? days = 29 : days = 28, 23, 59, 59);                        }
                        else
                        {
                            tempStrart = new DateTime(dateTime.Year - 1, 9, 1);
                            tempEnt = new DateTime(dateTime.Year, 2, (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) ? days = 29 : days = 28, 23, 59, 59);
                        }
                    }

                    break;
                case "month":
                    tempStrart = new DateTime(dateTime.Year, dateTime.Month, 1);
                    tempEnt = new DateTime(dateTime.Year, dateTime.Month, DateTime.DaysInMonth(dateTime.Year, dateTime.Month), 23, 59, 59);
                    break;
                case "week":
                    DateTimeOffset weekStrart = dateTime.AddDays(-(int)(dateTime.DayOfWeek) + 1);
                    DateTimeOffset weekEnd  = dateTime.AddDays(7-(int)(dateTime.DayOfWeek));
                    tempStrart = new DateTime(weekStrart.Year, weekStrart.Month, weekStrart.Day);
                    tempEnt = new DateTime(weekEnd.Year, weekEnd.Month, weekEnd.Day, 23, 59, 59); 


                    break;
                default:
                    tempStrart = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day);
                    tempEnt = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, 23, 59, 59);
                    //start = dateLenth ? DateTimeOffset.Parse($"{dayStart}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{dayStart}").ToUnixTimeSeconds();
                    //end = dateLenth ? DateTimeOffset.Parse($"{dayEnd}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{dayEnd}").ToUnixTimeSeconds();
                    break;            
            }

            start = dateLenth ? DateTimeOffset.Parse($"{tempStrart}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{tempStrart}").ToUnixTimeSeconds();
            end = dateLenth ? DateTimeOffset.Parse($"{tempEnt}").ToUnixTimeMilliseconds() : DateTimeOffset.Parse($"{tempEnt}").ToUnixTimeSeconds();

            return (start, end);

        }


    }
}