package com.bigkoo.pickerview.utils;

import android.util.Log;

import java.util.Date;
import java.util.GregorianCalendar;

/**
 * author: Jerry on 2016/7/11 11:29.
 * description:工具类，实现公农历互转
 */
public class LunarCalendar {

    /**
     * 支持转换的最小农历年份
     */
    public static final int MIN_YEAR = 1900;
    /**
     * 支持转换的最大农历年份
     */
    public static final int MAX_YEAR = 2099;

    /**
     * 公历每月前的天数
     */
    private static final int DAYS_BEFORE_MONTH[] = {0, 31, 59, 90, 120, 151, 181,
            212, 243, 273, 304, 334, 365};

    /**
     * 用来表示1900年到2099年间农历年份的相关信息，共24位bit的16进制表示，其中：
     * 1. 前4位表示该年闰哪个月；
     * 2. 5-17位表示农历年份13个月的大小月分布，0表示小，1表示大；
     * 3. 最后7位表示农历年首（正月初一）对应的公历日期。
     * <p>
     * 以2014年的数据0x955ABF为例说明：
     * 1001 0101 0101 1010 1011 1111
     * 闰九月  农历正月初一对应公历1月31号
     */
    private static final int LUNAR_INFO[] = {
            0x84B6BF,/*1900*/
            0x04AE53, 0x0A5748, 0x5526BD, 0x0D2650, 0x0D9544, 0x46AAB9, 0x056A4D, 0x09AD42, 0x24AEB6, 0x04AE4A,/*1901-1910*/
            0x6A4DBE, 0x0A4D52, 0x0D2546, 0x5D52BA, 0x0B544E, 0x0D6A43, 0x296D37, 0x095B4B, 0x749BC1, 0x049754,/*1911-1920*/
            0x0A4B48, 0x5B25BC, 0x06A550, 0x06D445, 0x4ADAB8, 0x02B64D, 0x095742, 0x2497B7, 0x04974A, 0x664B3E,/*1921-1930*/
            0x0D4A51, 0x0EA546, 0x56D4BA, 0x05AD4E, 0x02B644, 0x393738, 0x092E4B, 0x7C96BF, 0x0C9553, 0x0D4A48,/*1931-1940*/
            0x6DA53B, 0x0B554F, 0x056A45, 0x4AADB9, 0x025D4D, 0x092D42, 0x2C95B6, 0x0A954A, 0x7B4ABD, 0x06CA51,/*1941-1950*/
            0x0B5546, 0x555ABB, 0x04DA4E, 0x0A5B43, 0x352BB8, 0x052B4C, 0x8A953F, 0x0E9552, 0x06AA48, 0x6AD53C,/*1951-1960*/
            0x0AB54F, 0x04B645, 0x4A5739, 0x0A574D, 0x052642, 0x3E9335, 0x0D9549, 0x75AABE, 0x056A51, 0x096D46,/*1961-1970*/
            0x54AEBB, 0x04AD4F, 0x0A4D43, 0x4D26B7, 0x0D254B, 0x8D52BF, 0x0B5452, 0x0B6A47, 0x696D3C, 0x095B50,/*1971-1980*/
            0x049B45, 0x4A4BB9, 0x0A4B4D, 0xAB25C2, 0x06A554, 0x06D449, 0x6ADA3D, 0x0AB651, 0x095746, 0x5497BB,/*1981-1990*/
            0x04974F, 0x064B44, 0x36A537, 0x0EA54A, 0x86B2BF, 0x05AC53, 0x0AB647, 0x5936BC, 0x092E50, 0x0C9645,/*1991-2000*/
            0x4D4AB8, 0x0D4A4C, 0x0DA541, 0x25AAB6, 0x056A49, 0x7AADBD, 0x025D52, 0x092D47, 0x5C95BA, 0x0A954E,/*2001-2010*/
            0x0B4A43, 0x4B5537, 0x0AD54A, 0x955ABF, 0x04BA53, 0x0A5B48, 0x652BBC, 0x052B50, 0x0A9345, 0x474AB9,/*2011-2020*/
            0x06AA4C, 0x0AD541, 0x24DAB6, 0x04B64A, 0x6a573D, 0x0A4E51, 0x0D2646, 0x5E933A, 0x0D534D, 0x05AA43,/*2021-2030*/
            0x36B537, 0x096D4B, 0xB4AEBF, 0x04AD53, 0x0A4D48, 0x6D25BC, 0x0D254F, 0x0D5244, 0x5DAA38, 0x0B5A4C,/*2031-2040*/
            0x056D41, 0x24ADB6, 0x049B4A, 0x7A4BBE, 0x0A4B51, 0x0AA546, 0x5B52BA, 0x06D24E, 0x0ADA42, 0x355B37,/*2041-2050*/
            0x09374B, 0x8497C1, 0x049753, 0x064B48, 0x66A53C, 0x0EA54F, 0x06AA44, 0x4AB638, 0x0AAE4C, 0x092E42,/*2051-2060*/
            0x3C9735, 0x0C9649, 0x7D4ABD, 0x0D4A51, 0x0DA545, 0x55AABA, 0x056A4E, 0x0A6D43, 0x452EB7, 0x052D4B,/*2061-2070*/
            0x8A95BF, 0x0A9553, 0x0B4A47, 0x6B553B, 0x0AD54F, 0x055A45, 0x4A5D38, 0x0A5B4C, 0x052B42, 0x3A93B6,/*2071-2080*/
            0x069349, 0x7729BD, 0x06AA51, 0x0AD546, 0x54DABA, 0x04B64E, 0x0A5743, 0x452738, 0x0D264A, 0x8E933E,/*2081-2090*/
            0x0D5252, 0x0DAA47, 0x66B53B, 0x056D4F, 0x04AE45, 0x4A4EB9, 0x0A4D4C, 0x0D1541, 0x2D92B5          /*2091-2099*/
    };
    private static int[] solar_1_1 = {1887, 0xec04c, 0xec23f, 0xec435, 0xec649,
            0xec83e, 0xeca51, 0xecc46, 0xece3a, 0xed04d, 0xed242, 0xed436,
            0xed64a, 0xed83f, 0xeda53, 0xedc48, 0xede3d, 0xee050, 0xee244,
            0xee439, 0xee64d, 0xee842, 0xeea36, 0xeec4a, 0xeee3e, 0xef052,
            0xef246, 0xef43a, 0xef64e, 0xef843, 0xefa37, 0xefc4b, 0xefe41,
            0xf0054, 0xf0248, 0xf043c, 0xf0650, 0xf0845, 0xf0a38, 0xf0c4d,
            0xf0e42, 0xf1037, 0xf124a, 0xf143e, 0xf1651, 0xf1846, 0xf1a3a,
            0xf1c4e, 0xf1e44, 0xf2038, 0xf224b, 0xf243f, 0xf2653, 0xf2848,
            0xf2a3b, 0xf2c4f, 0xf2e45, 0xf3039, 0xf324d, 0xf3442, 0xf3636,
            0xf384a, 0xf3a3d, 0xf3c51, 0xf3e46, 0xf403b, 0xf424e, 0xf4443,
            0xf4638, 0xf484c, 0xf4a3f, 0xf4c52, 0xf4e48, 0xf503c, 0xf524f,
            0xf5445, 0xf5639, 0xf584d, 0xf5a42, 0xf5c35, 0xf5e49, 0xf603e,
            0xf6251, 0xf6446, 0xf663b, 0xf684f, 0xf6a43, 0xf6c37, 0xf6e4b,
            0xf703f, 0xf7252, 0xf7447, 0xf763c, 0xf7850, 0xf7a45, 0xf7c39,
            0xf7e4d, 0xf8042, 0xf8254, 0xf8449, 0xf863d, 0xf8851, 0xf8a46,
            0xf8c3b, 0xf8e4f, 0xf9044, 0xf9237, 0xf944a, 0xf963f, 0xf9853,
            0xf9a47, 0xf9c3c, 0xf9e50, 0xfa045, 0xfa238, 0xfa44c, 0xfa641,
            0xfa836, 0xfaa49, 0xfac3d, 0xfae52, 0xfb047, 0xfb23a, 0xfb44e,
            0xfb643, 0xfb837, 0xfba4a, 0xfbc3f, 0xfbe53, 0xfc048, 0xfc23c,
            0xfc450, 0xfc645, 0xfc839, 0xfca4c, 0xfcc41, 0xfce36, 0xfd04a,
            0xfd23d, 0xfd451, 0xfd646, 0xfd83a, 0xfda4d, 0xfdc43, 0xfde37,
            0xfe04b, 0xfe23f, 0xfe453, 0xfe648, 0xfe83c, 0xfea4f, 0xfec44,
            0xfee38, 0xff04c, 0xff241, 0xff436, 0xff64a, 0xff83e, 0xffa51,
            0xffc46, 0xffe3a, 0x10004e, 0x100242, 0x100437, 0x10064b, 0x100841,
            0x100a53, 0x100c48, 0x100e3c, 0x10104f, 0x101244, 0x101438,
            0x10164c, 0x101842, 0x101a35, 0x101c49, 0x101e3d, 0x102051,
            0x102245, 0x10243a, 0x10264e, 0x102843, 0x102a37, 0x102c4b,
            0x102e3f, 0x103053, 0x103247, 0x10343b, 0x10364f, 0x103845,
            0x103a38, 0x103c4c, 0x103e42, 0x104036, 0x104249, 0x10443d,
            0x104651, 0x104846, 0x104a3a, 0x104c4e, 0x104e43, 0x105038,
            0x10524a, 0x10543e, 0x105652, 0x105847, 0x105a3b, 0x105c4f,
            0x105e45, 0x106039, 0x10624c, 0x106441, 0x106635, 0x106849,
            0x106a3d, 0x106c51, 0x106e47, 0x10703c, 0x10724f, 0x107444,
            0x107638, 0x10784c, 0x107a3f, 0x107c53, 0x107e48};
    private static int[] lunar_month_days = {1887, 0x1694, 0x16aa, 0x4ad5,
            0xab6, 0xc4b7, 0x4ae, 0xa56, 0xb52a, 0x1d2a, 0xd54, 0x75aa, 0x156a,
            0x1096d, 0x95c, 0x14ae, 0xaa4d, 0x1a4c, 0x1b2a, 0x8d55, 0xad4,
            0x135a, 0x495d, 0x95c, 0xd49b, 0x149a, 0x1a4a, 0xbaa5, 0x16a8,
            0x1ad4, 0x52da, 0x12b6, 0xe937, 0x92e, 0x1496, 0xb64b, 0xd4a,
            0xda8, 0x95b5, 0x56c, 0x12ae, 0x492f, 0x92e, 0xcc96, 0x1a94,
            0x1d4a, 0xada9, 0xb5a, 0x56c, 0x726e, 0x125c, 0xf92d, 0x192a,
            0x1a94, 0xdb4a, 0x16aa, 0xad4, 0x955b, 0x4ba, 0x125a, 0x592b,
            0x152a, 0xf695, 0xd94, 0x16aa, 0xaab5, 0x9b4, 0x14b6, 0x6a57,
            0xa56, 0x1152a, 0x1d2a, 0xd54, 0xd5aa, 0x156a, 0x96c, 0x94ae,
            0x14ae, 0xa4c, 0x7d26, 0x1b2a, 0xeb55, 0xad4, 0x12da, 0xa95d,
            0x95a, 0x149a, 0x9a4d, 0x1a4a, 0x11aa5, 0x16a8, 0x16d4, 0xd2da,
            0x12b6, 0x936, 0x9497, 0x1496, 0x1564b, 0xd4a, 0xda8, 0xd5b4,
            0x156c, 0x12ae, 0xa92f, 0x92e, 0xc96, 0x6d4a, 0x1d4a, 0x10d65,
            0xb58, 0x156c, 0xb26d, 0x125c, 0x192c, 0x9a95, 0x1a94, 0x1b4a,
            0x4b55, 0xad4, 0xf55b, 0x4ba, 0x125a, 0xb92b, 0x152a, 0x1694,
            0x96aa, 0x15aa, 0x12ab5, 0x974, 0x14b6, 0xca57, 0xa56, 0x1526,
            0x8e95, 0xd54, 0x15aa, 0x49b5, 0x96c, 0xd4ae, 0x149c, 0x1a4c,
            0xbd26, 0x1aa6, 0xb54, 0x6d6a, 0x12da, 0x1695d, 0x95a, 0x149a,
            0xda4b, 0x1a4a, 0x1aa4, 0xbb54, 0x16b4, 0xada, 0x495b, 0x936,
            0xf497, 0x1496, 0x154a, 0xb6a5, 0xda4, 0x15b4, 0x6ab6, 0x126e,
            0x1092f, 0x92e, 0xc96, 0xcd4a, 0x1d4a, 0xd64, 0x956c, 0x155c,
            0x125c, 0x792e, 0x192c, 0xfa95, 0x1a94, 0x1b4a, 0xab55, 0xad4,
            0x14da, 0x8a5d, 0xa5a, 0x1152b, 0x152a, 0x1694, 0xd6aa, 0x15aa,
            0xab4, 0x94ba, 0x14b6, 0xa56, 0x7527, 0xd26, 0xee53, 0xd54, 0x15aa,
            0xa9b5, 0x96c, 0x14ae, 0x8a4e, 0x1a4c, 0x11d26, 0x1aa4, 0x1b54,
            0xcd6a, 0xada, 0x95c, 0x949d, 0x149a, 0x1a2a, 0x5b25, 0x1aa4,
            0xfb52, 0x16b4, 0xaba, 0xa95b, 0x936, 0x1496, 0x9a4b, 0x154a,
            0x136a5, 0xda4, 0x15ac};

    /**
     * 将农历日期转换为公历日期
     *
     * @param year        农历年份
     * @param month       农历月
     * @param monthDay    农历日
     * @param isLeapMonth 该月是否是闰月
     * @return 返回农历日期对应的公历日期，year0, month1, day2.
     */
    public static final int[] lunarToSolar(int year, int month, int monthDay,
                                           boolean isLeapMonth) {
        int dayOffset;
        int leapMonth;
        int i;

        if (year < MIN_YEAR || year > MAX_YEAR || month < 1 || month > 12
                || monthDay < 1 || monthDay > 30) {
            throw new IllegalArgumentException(
                    "Illegal lunar date, must be like that:\n\t" +
                            "year : 1900~2099\n\t" +
                            "month : 1~12\n\t" +
                            "day : 1~30");
        }

        dayOffset = (LUNAR_INFO[year - MIN_YEAR] & 0x001F) - 1;

        if (((LUNAR_INFO[year - MIN_YEAR] & 0x0060) >> 5) == 2)
            dayOffset += 31;

        for (i = 1; i < month; i++) {
            if ((LUNAR_INFO[year - MIN_YEAR] & (0x80000 >> (i - 1))) == 0)
                dayOffset += 29;
            else
                dayOffset += 30;
        }

        dayOffset += monthDay;
        leapMonth = (LUNAR_INFO[year - MIN_YEAR] & 0xf00000) >> 20;

        // 这一年有闰月
        if (leapMonth != 0) {
            if (month > leapMonth || (month == leapMonth && isLeapMonth)) {
                if ((LUNAR_INFO[year - MIN_YEAR] & (0x80000 >> (month - 1))) == 0)
                    dayOffset += 29;
                else
                    dayOffset += 30;
            }
        }

        if (dayOffset > 366 || (year % 4 != 0 && dayOffset > 365)) {
            year += 1;
            if (year % 4 == 1)
                dayOffset -= 366;
            else
                dayOffset -= 365;
        }

        int[] solarInfo = new int[3];
        for (i = 1; i < 13; i++) {
            int iPos = DAYS_BEFORE_MONTH[i];
            if (year % 4 == 0 && i > 2) {
                iPos += 1;
            }

            if (year % 4 == 0 && i == 2 && iPos + 1 == dayOffset) {
                solarInfo[1] = i;
                solarInfo[2] = dayOffset - 31;
                break;
            }

            if (iPos >= dayOffset) {
                solarInfo[1] = i;
                iPos = DAYS_BEFORE_MONTH[i - 1];
                if (year % 4 == 0 && i > 2) {
                    iPos += 1;
                }
                if (dayOffset > iPos)
                    solarInfo[2] = dayOffset - iPos;
                else if (dayOffset == iPos) {
                    if (year % 4 == 0 && i == 2)
                        solarInfo[2] = DAYS_BEFORE_MONTH[i] - DAYS_BEFORE_MONTH[i - 1] + 1;
                    else
                        solarInfo[2] = DAYS_BEFORE_MONTH[i] - DAYS_BEFORE_MONTH[i - 1];

                } else
                    solarInfo[2] = dayOffset;
                break;
            }
        }
        solarInfo[0] = year;

        return solarInfo;
    }

    public static final int[] solarToLunar(int year, int month, int monthDay) {
        int[] lunarDate = new int[4];

        int index = year - solar_1_1[0];
        int data = (year << 9) | (month << 5)
                | (monthDay);
        int solar11 = 0;
        if (solar_1_1[index] > data) {
            index--;
        }
        solar11 = solar_1_1[index];
        int y = getBitInt(solar11, 12, 9);
        int m = getBitInt(solar11, 4, 5);
        int d = getBitInt(solar11, 5, 0);
        long offset = solarToInt(year, month,
                monthDay) - solarToInt(y, m, d);

        int days = lunar_month_days[index];
        int leap = getBitInt(days, 4, 13);

        int lunarY = index + solar_1_1[0];
        int lunarM = 1;
        int lunarD = 1;
        offset += 1;

        for (int i = 0; i < 13; i++) {
            int dm = getBitInt(days, 1, 12 - i) == 1 ? 30 : 29;
            if (offset > dm) {
                lunarM++;
                offset -= dm;
            } else {
                break;
            }
        }
        lunarD = (int) (offset);
        lunarDate[0] = lunarY;
        lunarDate[1] = lunarM;
        boolean isLeap = false;
        if (leap != 0 && lunarM > leap) {
            lunarDate[1] = lunarM - 1;
            if (lunarM == leap + 1) {
                isLeap = true;
            }
        }

        lunarDate[2] = lunarD;
        lunarDate[3] = isLeap ? 1 : 0;
        //Log.i("----------->",year+"-"+month+"-"+monthDay+"====>"+lunarDate[0]+"-"+lunarDate[1]+"-"+lunarDate[2]+"-"+lunarDate[3]);
        return lunarDate;
    }


    /**
     * 将公历日期转换为农历日期，且标识是否是闰月
     *
     * @param year
     * @param month
     * @param monthDay
     * @return 返回公历日期对应的农历日期，year0，month1，day2，leap3
     * @deprecated 不准确
     */
    @Deprecated
    public static final int[] solarToLunarDeprecated(int year, int month, int monthDay) {
        int[] lunarDate = new int[4];
        Date baseDate = new GregorianCalendar(1900, 0, 31).getTime();
        Date objDate = new GregorianCalendar(year, month - 1, monthDay).getTime();
        int offset = (int) ((objDate.getTime() - baseDate.getTime()) / 86400000L);

        // 用offset减去每农历年的天数计算当天是农历第几天
        // iYear最终结果是农历的年份, offset是当年的第几天
        int iYear, daysOfYear = 0;
        for (iYear = MIN_YEAR; iYear <= MAX_YEAR && offset > 0; iYear++) {
            daysOfYear = daysInLunarYear(iYear);
            offset -= daysOfYear;
        }
        if (offset < 0) {
            offset += daysOfYear;
            iYear--;
        }

        // 农历年份
        lunarDate[0] = iYear;

        int leapMonth = leapMonth(iYear); // 闰哪个月,1-12
        boolean isLeap = false;
        // 用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
        int iMonth, daysOfMonth = 0;
        for (iMonth = 1; iMonth <= 13 && offset > 0; iMonth++) {
            daysOfMonth = daysInLunarMonth(iYear, iMonth);
            offset -= daysOfMonth;
        }
        // 当前月超过闰月，要校正
        if (leapMonth != 0 && iMonth > leapMonth) {
            --iMonth;
            Log.i("----------->", year + "-" + month + "-" + monthDay + "====>" + iMonth + "-" + leapMonth);
            if (iMonth == leapMonth) {
                isLeap = true;
            }
        }
        // offset小于0时，也要校正
        if (offset < 0) {
            offset += daysOfMonth;
            --iMonth;
        }

        lunarDate[1] = iMonth;
        lunarDate[2] = offset + 1;
        lunarDate[3] = isLeap ? 1 : 0;

        //Log.i("----------->",year+"-"+month+"-"+monthDay+"====>"+lunarDate[0]+"-"+lunarDate[1]+"-"+lunarDate[2]+"-"+lunarDate[3]);
        return lunarDate;
    }

    /**
     * 传回农历year年month月的总天数
     *
     * @param year  要计算的年份
     * @param month 要计算的月
     * @return 传回天数
     */
    final public static int daysInMonth(int year, int month) {
        return daysInMonth(year, month, false);
    }

    /**
     * 传回农历year年month月的总天数
     *
     * @param year  要计算的年份
     * @param month 要计算的月
     * @param leap  当月是否是闰月
     * @return 传回天数，如果闰月是错误的，返回0.
     */
    public static final int daysInMonth(int year, int month, boolean leap) {
        int leapMonth = leapMonth(year);
        int offset = 0;

        // 如果本年有闰月且month大于闰月时，需要校正
        if (leapMonth != 0 && month > leapMonth) {
            offset = 1;
        }

        // 不考虑闰月
        if (!leap) {
            return daysInLunarMonth(year, month + offset);
        } else {
            // 传入的闰月是正确的月份
            if (leapMonth != 0 && leapMonth == month) {
                return daysInLunarMonth(year, month + 1);
            }
        }

        return 0;
    }

    /**
     * 传回农历 year年的总天数
     *
     * @param year 将要计算的年份
     * @return 返回传入年份的总天数
     */
    private static int daysInLunarYear(int year) {
        int i, sum = 348;
        if (leapMonth(year) != 0) {
            sum = 377;
        }
        int monthInfo = LUNAR_INFO[year - MIN_YEAR] & 0x0FFF80;
        for (i = 0x80000; i > 0x7; i >>= 1) {
            if ((monthInfo & i) != 0)
                sum += 1;
        }
        return sum;
    }

    /**
     * 传回农历 year年month月的总天数，总共有13个月包括闰月
     *
     * @param year  将要计算的年份
     * @param month 将要计算的月份
     * @return 传回农历 year年month月的总天数
     */
    private static int daysInLunarMonth(int year, int month) {
        if ((LUNAR_INFO[year - MIN_YEAR] & (0x100000 >> month)) == 0)
            return 29;
        else
            return 30;
    }

    /**
     * 传回农历 year年闰哪个月 1-12 , 没闰传回 0
     *
     * @param year 将要计算的年份
     * @return 传回农历 year年闰哪个月1-12, 没闰传回 0
     */
    public static int leapMonth(int year) {
        return (int) ((LUNAR_INFO[year - MIN_YEAR] & 0xF00000)) >> 20;
    }


    private static int getBitInt(int data, int length, int shift) {
        return (data & (((1 << length) - 1) << shift)) >> shift;
    }

    private static long solarToInt(int y, int m, int d) {
        m = (m + 9) % 12;
        y = y - m / 10;
        return 365 * y + y / 4 - y / 100 + y / 400 + (m * 306 + 5) / 10
                + (d - 1);
    }

}
