package com.github.hui.quick.plugin.date;

import java.util.Objects;

/**
 * 源码参考:  http://blog.csdn.net/mexican_jacky/article/details/51537571
 *
 * Created by yihui on 2017/9/17.
 */
public class ChineseDateTool {
    /*
     * |----4位闰月|-------------13位1为30天，0为29天|
     */
    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};

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

    // WARNING: Dates before Oct. 1582 are inaccurate
    private static long solarToInt(int y, int m, int d) {
        m = (m + 9) % 12;
        y = y - m / 10;
        return 365L * y + y / 4 - y / 100 + y / 400 + (m * 306 + 5) / 10 + (d - 1);
    }


    private static Solar solarFromInt(long g) {
        long y = (10000 * g + 14780) / 3652425;
        long ddd = g - (365 * y + y / 4 - y / 100 + y / 400);
        if (ddd < 0) {
            y--;
            ddd = g - (365 * y + y / 4 - y / 100 + y / 400);
        }
        long mi = (100 * ddd + 52) / 3060;
        long mm = (mi + 2) % 12 + 1;
        y = y + (mi + 2) / 12;
        long dd = ddd - (mi * 306 + 5) / 10 + 1;
        Solar solar = new Solar();
        solar.solarYear = (int) y;
        solar.solarMonth = (int) mm;
        solar.solarDay = (int) dd;
        return solar;
    }

    /**
     * 农历转公历
     */
    public static Solar lunarToSolar(Lunar lunar) {
        int days = lunar_month_days[lunar.lunarYear - lunar_month_days[0]];
        int leap = getBitInt(days, 4, 13);
        int offset = 0;
        int loopend = leap;
        if (!lunar.isleap) {
            if (lunar.lunarMonth <= leap || leap == 0) {
                loopend = lunar.lunarMonth - 1;
            } else {
                loopend = lunar.lunarMonth;
            }
        }
        for (int i = 0; i < loopend; i++) {
            offset += getBitInt(days, 1, 12 - i) == 1 ? 30 : 29;
        }
        offset += lunar.lunarDay;

        int solar11 = solar_1_1[lunar.lunarYear - solar_1_1[0]];

        int y = getBitInt(solar11, 12, 9);
        int m = getBitInt(solar11, 4, 5);
        int d = getBitInt(solar11, 5, 0);

        return solarFromInt(solarToInt(y, m, d) + offset - 1);
    }

    /**
     * 公历转农历
     */
    public static Lunar solarToLunar(Solar solar) {
        Lunar lunar = new Lunar();
        int index = solar.solarYear - solar_1_1[0];
        int data = (solar.solarYear << 9) | (solar.solarMonth << 5) | (solar.solarDay);
        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(solar.solarYear, solar.solarMonth, solar.solarDay) - 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);
        lunar.lunarYear = lunarY;
        lunar.lunarMonth = lunarM;
        lunar.isleap = false;
        if (leap != 0 && lunarM > leap) {
            lunar.lunarMonth = lunarM - 1;
            if (lunarM == leap + 1) {
                lunar.isleap = true;
            }
        }

        lunar.lunarDay = lunarD;
        return lunar;
    }

    // 农历
    public static class Lunar {
        /**
         * 是否为闰月
         */
        private boolean isleap;

        /**
         * 年
         */
        private int lunarYear;

        /**
         * 月
         */
        private int lunarMonth;


        /**
         * 日
         */
        private int lunarDay;

        public Lunar() {
        }

        public Lunar(boolean isleap, int lunarYear, int lunarMonth, int lunarDay) {
            this.isleap = isleap;
            this.lunarYear = lunarYear;
            this.lunarMonth = lunarMonth;
            this.lunarDay = lunarDay;
        }

        public boolean isIsleap() {
            return isleap;
        }

        public void setIsleap(boolean isleap) {
            this.isleap = isleap;
        }

        public int getLunarYear() {
            return lunarYear;
        }

        public void setLunarYear(int lunarYear) {
            this.lunarYear = lunarYear;
        }

        public int getLunarMonth() {
            return lunarMonth;
        }

        public void setLunarMonth(int lunarMonth) {
            this.lunarMonth = lunarMonth;
        }

        public int getLunarDay() {
            return lunarDay;
        }

        public void setLunarDay(int lunarDay) {
            this.lunarDay = lunarDay;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }
            Lunar lunar = (Lunar) o;
            return isleap == lunar.isleap && lunarYear == lunar.lunarYear && lunarMonth == lunar.lunarMonth &&
                    lunarDay == lunar.lunarDay;
        }

        @Override
        public int hashCode() {

            return Objects.hash(isleap, lunarYear, lunarMonth, lunarDay);
        }

        @Override
        public String toString() {
            return "Lunar{" + "isleap=" + isleap + ", lunarYear=" + lunarYear + ", lunarMonth=" + lunarMonth +
                    ", lunarDay=" + lunarDay + '}';
        }
    }


    // 公历
    public static class Solar {
        private int solarYear;
        private int solarMonth;
        private int solarDay;

        public Solar(int solarYear, int solarMonth, int solarDay) {
            this.solarYear = solarYear;
            this.solarMonth = solarMonth;
            this.solarDay = solarDay;
        }

        public Solar() {
        }

        public int getSolarYear() {
            return solarYear;
        }

        public void setSolarYear(int solarYear) {
            this.solarYear = solarYear;
        }

        public int getSolarMonth() {
            return solarMonth;
        }

        public void setSolarMonth(int solarMonth) {
            this.solarMonth = solarMonth;
        }

        public int getSolarDay() {
            return solarDay;
        }

        public void setSolarDay(int solarDay) {
            this.solarDay = solarDay;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }
            Solar solar = (Solar) o;
            return solarYear == solar.solarYear && solarMonth == solar.solarMonth && solarDay == solar.solarDay;
        }

        @Override
        public int hashCode() {

            return Objects.hash(solarYear, solarMonth, solarDay);
        }

        @Override
        public String toString() {
            return "Solar{" + "solarYear=" + solarYear + ", solarMonth=" + solarMonth + ", solarDay=" + solarDay + '}';
        }
    }
}

