using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Common
{
    public class LunarCalendarHelper
    {
        //C# 获取农历日期
        ///<summary>
        /// 实例化一个 ChineseLunisolarCalendar
        ///</summary>
        private static ChineseLunisolarCalendar ChineseCalendar = new ChineseLunisolarCalendar();

        ///<summary>
        /// 十天干
        ///</summary>
        private static string[] tg = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" };

        ///<summary>
        /// 十二地支
        ///</summary>
        private static string[] dz = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" };

        ///<summary>
        /// 十二生肖
        ///</summary>
        private static string[] sx = { "鼠", "牛", "虎", "免", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };

        ///<summary>
        /// 返回农历天干地支年
        ///</summary>
        ///<param name="year">农历年</param>
        ///<return s></return s>
        public static string GetLunisolarYear(int year)
        {
            if (year > 3)
            {
                int tgIndex = (year - 4) % 10;
                int dzIndex = (year - 4) % 12;

                return string.Concat(tg[tgIndex], dz[dzIndex], "[", sx[dzIndex], "]");
            }

            throw new ArgumentOutOfRangeException("无效的年份!");
        }

        ///<summary>
        /// 农历月
        ///</summary>

        ///<return s></return s>
        private static string[] months = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二" };

        ///<summary>
        /// 农历日
        ///</summary>
        private static string[] days1 = { "初", "十", "廿", "三" };
        ///<summary>
        /// 农历日
        ///</summary>
        private static string[] days = { "一", "二", "三", "四", "五", "六", "七", "八", "九", "十" };
        private static int[] daysInt = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

        ///<summary>
        /// 返回农历月
        ///</summary>
        ///<param name="month">月份</param>
        ///<return s></return s>
        public static string GetLunisolarMonth(int month)
        {
            if (month < 13 && month > 0)
            {
                return months[month - 1];
            }

            throw new ArgumentOutOfRangeException("无效的月份!");
        }

        ///<summary>
        /// 返回农历日
        ///</summary>
        ///<param name="day">天</param>
        ///<return s></return s>
        public static string GetLunisolarDay(int day)
        {
            if (day > 0 && day < 32)
            {
                if (day != 20 && day != 30)
                {
                    return string.Concat(days1[(day - 1) / 10], days[(day - 1) % 10]);
                }
                else
                {
                    return string.Concat(days[(day - 1) / 10], days1[1]);
                }
            }

            throw new ArgumentOutOfRangeException("无效的日!");
        }



        ///<summary>
        /// 根据公历获取农历日期
        ///</summary>
        ///<param name="datetime">公历日期</param>
        ///<return s></return s>
        public static string GetChineseDateTime(DateTime datetime)
        {
            int year = ChineseCalendar.GetYear(datetime);
            int month = ChineseCalendar.GetMonth(datetime);
            int day = ChineseCalendar.GetDayOfMonth(datetime);
            //获取闰月， 0 则表示没有闰月
            int leapMonth = ChineseCalendar.GetLeapMonth(year);

            bool isleap = false;

            if (leapMonth > 0)
            {
                if (leapMonth == month)
                {
                    //闰月
                    isleap = true;
                    month--;
                }
                else if (month > leapMonth)
                {
                    month--;
                }
            }

            return string.Concat(isleap ? "闰" : string.Empty, GetLunisolarMonth(month), "月", GetLunisolarDay(day));
        }

        public static bool IsHaveNewYear(DateTime datetime)
        {
            int year = ChineseCalendar.GetYear(datetime);
            int month = ChineseCalendar.GetMonth(datetime);
            int day = ChineseCalendar.GetDayOfMonth(datetime);
            //获取闰月， 0 则表示没有闰月
            int leapMonth = ChineseCalendar.GetLeapMonth(year);

            bool isleap = false;

            if (leapMonth > 0)
            {
                if (leapMonth == month)
                {
                    //闰月
                    isleap = true;
                    month--;
                }
                else if (month > leapMonth)
                {
                    month--;
                }
            }

            if (GetLunisolarMonth(month) != "正")
            {
                return true;
            }
            else
            {
                if (new List<string> { "初一", "初二", "初三", "初四", "初五", "初六", "初七" }.Contains(GetLunisolarDay(day)))
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
        }
    }
}