/*
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.jcodings.specific;

import org.jcodings.CaseFoldMapEncoding;
import org.jcodings.Config;
import org.jcodings.ISOEncoding;
import org.jcodings.IntHolder;
import org.jcodings.constants.CharacterType;

final public class Windows_1251Encoding extends CaseFoldMapEncoding {

    protected Windows_1251Encoding() {
        super("Windows-1251", CP1251_CtypeTable, CP1251_ToLowerCaseTable, CP1251_CaseFoldMap, false);
    }

    @Override
    public int caseMap(IntHolder flagP, byte[] bytes, IntHolder pp, int end, byte[] to, int toP, int toEnd) {
        int toStart = toP;
        int flags = flagP.value;

        while (pp.value < end && toP < toEnd) {
            int code = bytes[pp.value++] & 0xff;
            if ((CP1251_CtypeTable[code] & CharacterType.BIT_UPPER) != 0 && (flags & (Config.CASE_DOWNCASE | Config.CASE_FOLD)) != 0) {
                flags |= Config.CASE_MODIFIED;
                code = LowerCaseTable[code];
            } else if (code == 0xB5) {
            } else if ((CP1251_CtypeTable[code] & CharacterType.BIT_LOWER) != 0 && (flags & Config.CASE_UPCASE) != 0) {
                flags |= Config.CASE_MODIFIED;
                if ((0x61 <= code && code <= 0x7A) || (0xE0 <= code && code <= 0xFF))
                    code -= 0x20;
                else if (code == 0xA2 || code == 0xB3 || code == 0xBE)
                    code -= 0x01;
                else if (code == 0x83)
                    code = 0x81;
                else if (code == 0xBC)
                    code = 0xA3;
                else if (code == 0xB4)
                    code = 0xA5;
                else
                    code -= 0x10;
            }
            to[toP++] = (byte)code;
            if ((flags & Config.CASE_TITLECASE) != 0) {
                flags ^= (Config.CASE_UPCASE | Config.CASE_DOWNCASE | Config.CASE_TITLECASE);
            }
        }
        flagP.value = flags;
        return toP - toStart;
    }


    @Override
    public int mbcCaseFold(int flag, byte[]bytes, IntHolder pp, int end, byte[]lower) {
        int p = pp.value;
        int lowerP = 0;

        lower[lowerP] = LowerCaseTable[bytes[p] & 0xff];
        pp.value++;
        return 1;
    }

    @Override
    public boolean isCodeCType(int code, int ctype) {
        return code < 256 ? isCodeCTypeInternal(code, ctype) : false;
    }

    static final short CP1251_CtypeTable[] = {
        0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
        0x4008, 0x428c, 0x4209, 0x4208, 0x4208, 0x4208, 0x4008, 0x4008,
        0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
        0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
        0x4284, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
        0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
        0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0,
        0x78b0, 0x78b0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
        0x41a0, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x74a2,
        0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2,
        0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2,
        0x74a2, 0x74a2, 0x74a2, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x51a0,
        0x41a0, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x70e2,
        0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2,
        0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2,
        0x70e2, 0x70e2, 0x70e2, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x4008,
        0x34a2, 0x34a2, 0x01a0, 0x30e2, 0x01a0, 0x01a0, 0x01a0, 0x01a0,
        0x0000, 0x01a0, 0x34a2, 0x01a0, 0x34a2, 0x34a2, 0x34a2, 0x34a2,
        0x30e2, 0x01a0, 0x01a0, 0x01a0, 0x01a0, 0x01a0, 0x01a0, 0x01a0,
        0x0008, 0x0000, 0x30e2, 0x01a0, 0x30e2, 0x30e2, 0x30e2, 0x30e2,
        0x0280, 0x34a2, 0x30e2, 0x34a2, 0x01a0, 0x34a2, 0x01a0, 0x01a0,
        0x34a2, 0x01a0, 0x34a2, 0x01a0, 0x01a0, 0x01a0, 0x01a0, 0x34a2,
        0x01a0, 0x01a0, 0x34a2, 0x30e2, 0x30e2, 0x31e2, 0x01a0, 0x01a0,
        0x30e2, 0x0000, 0x30e2, 0x01a0, 0x30e2, 0x34a2, 0x30e2, 0x30e2,
        0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2,
        0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2,
        0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2,
        0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2,
        0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2,
        0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2,
        0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2,
        0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2
    };

    static final byte CP1251_ToLowerCaseTable[] = new byte[]{
        (byte)'\000', (byte)'\001', (byte)'\002', (byte)'\003', (byte)'\004', (byte)'\005', (byte)'\006', (byte)'\007',
        (byte)'\010', (byte)'\011', (byte)'\012', (byte)'\013', (byte)'\014', (byte)'\015', (byte)'\016', (byte)'\017',
        (byte)'\020', (byte)'\021', (byte)'\022', (byte)'\023', (byte)'\024', (byte)'\025', (byte)'\026', (byte)'\027',
        (byte)'\030', (byte)'\031', (byte)'\032', (byte)'\033', (byte)'\034', (byte)'\035', (byte)'\036', (byte)'\037',
        (byte)'\040', (byte)'\041', (byte)'\042', (byte)'\043', (byte)'\044', (byte)'\045', (byte)'\046', (byte)'\047',
        (byte)'\050', (byte)'\051', (byte)'\052', (byte)'\053', (byte)'\054', (byte)'\055', (byte)'\056', (byte)'\057',
        (byte)'\060', (byte)'\061', (byte)'\062', (byte)'\063', (byte)'\064', (byte)'\065', (byte)'\066', (byte)'\067',
        (byte)'\070', (byte)'\071', (byte)'\072', (byte)'\073', (byte)'\074', (byte)'\075', (byte)'\076', (byte)'\077',
        (byte)'\100', (byte)'\141', (byte)'\142', (byte)'\143', (byte)'\144', (byte)'\145', (byte)'\146', (byte)'\147',
        (byte)'\150', (byte)'\151', (byte)'\152', (byte)'\153', (byte)'\154', (byte)'\155', (byte)'\156', (byte)'\157',
        (byte)'\160', (byte)'\161', (byte)'\162', (byte)'\163', (byte)'\164', (byte)'\165', (byte)'\166', (byte)'\167',
        (byte)'\170', (byte)'\171', (byte)'\172', (byte)'\133', (byte)'\134', (byte)'\135', (byte)'\136', (byte)'\137',
        (byte)'\140', (byte)'\141', (byte)'\142', (byte)'\143', (byte)'\144', (byte)'\145', (byte)'\146', (byte)'\147',
        (byte)'\150', (byte)'\151', (byte)'\152', (byte)'\153', (byte)'\154', (byte)'\155', (byte)'\156', (byte)'\157',
        (byte)'\160', (byte)'\161', (byte)'\162', (byte)'\163', (byte)'\164', (byte)'\165', (byte)'\166', (byte)'\167',
        (byte)'\170', (byte)'\171', (byte)'\172', (byte)'\173', (byte)'\174', (byte)'\175', (byte)'\176', (byte)'\177',
        (byte)'\220', (byte)'\203', (byte)'\202', (byte)'\203', (byte)'\204', (byte)'\205', (byte)'\206', (byte)'\207',
        (byte)'\210', (byte)'\211', (byte)'\232', (byte)'\213', (byte)'\234', (byte)'\235', (byte)'\236', (byte)'\237',
        (byte)'\220', (byte)'\221', (byte)'\222', (byte)'\223', (byte)'\224', (byte)'\225', (byte)'\226', (byte)'\227',
        (byte)'\230', (byte)'\231', (byte)'\232', (byte)'\233', (byte)'\234', (byte)'\235', (byte)'\236', (byte)'\237',
        (byte)'\240', (byte)'\242', (byte)'\242', (byte)'\274', (byte)'\244', (byte)'\264', (byte)'\246', (byte)'\247',
        (byte)'\270', (byte)'\251', (byte)'\272', (byte)'\253', (byte)'\254', (byte)'\255', (byte)'\256', (byte)'\277',
        (byte)'\260', (byte)'\261', (byte)'\263', (byte)'\263', (byte)'\264', (byte)'\265', (byte)'\266', (byte)'\267',
        (byte)'\270', (byte)'\271', (byte)'\272', (byte)'\273', (byte)'\274', (byte)'\276', (byte)'\276', (byte)'\277',
        (byte)'\340', (byte)'\341', (byte)'\342', (byte)'\343', (byte)'\344', (byte)'\345', (byte)'\346', (byte)'\347',
        (byte)'\350', (byte)'\351', (byte)'\352', (byte)'\353', (byte)'\354', (byte)'\355', (byte)'\356', (byte)'\357',
        (byte)'\360', (byte)'\361', (byte)'\362', (byte)'\363', (byte)'\364', (byte)'\365', (byte)'\366', (byte)'\367',
        (byte)'\370', (byte)'\371', (byte)'\372', (byte)'\373', (byte)'\374', (byte)'\375', (byte)'\376', (byte)'\377',
        (byte)'\340', (byte)'\341', (byte)'\342', (byte)'\343', (byte)'\344', (byte)'\345', (byte)'\346', (byte)'\347',
        (byte)'\350', (byte)'\351', (byte)'\352', (byte)'\353', (byte)'\354', (byte)'\355', (byte)'\356', (byte)'\357',
        (byte)'\360', (byte)'\361', (byte)'\362', (byte)'\363', (byte)'\364', (byte)'\365', (byte)'\366', (byte)'\367',
        (byte)'\370', (byte)'\371', (byte)'\372', (byte)'\373', (byte)'\374', (byte)'\375', (byte)'\376', (byte)'\377'
    };

    static final int CP1251_CaseFoldMap[][] = {
        { 0xb8, 0xa8 },

        { 0xe0, 0xc0 },
        { 0xe1, 0xc1 },
        { 0xe2, 0xc2 },
        { 0xe3, 0xc3 },
        { 0xe4, 0xc4 },
        { 0xe5, 0xc5 },
        { 0xe6, 0xc6 },
        { 0xe7, 0xc7 },
        { 0xe8, 0xc8 },
        { 0xe9, 0xc9 },
        { 0xea, 0xca },
        { 0xeb, 0xcb },
        { 0xec, 0xcc },
        { 0xed, 0xcd },
        { 0xee, 0xce },
        { 0xef, 0xcf },

        { 0xf0, 0xd0 },
        { 0xf1, 0xd1 },
        { 0xf2, 0xd2 },
        { 0xf3, 0xd3 },
        { 0xf4, 0xd4 },
        { 0xf5, 0xd5 },
        { 0xf6, 0xd6 },
        { 0xf7, 0xd7 },
        { 0xf8, 0xd8 },
        { 0xf9, 0xd9 },
        { 0xfa, 0xda },
        { 0xfb, 0xdb },
        { 0xfc, 0xdc },
        { 0xfd, 0xdd },
        { 0xfe, 0xde },
        { 0xff, 0xdf }
    };

    public static final Windows_1251Encoding INSTANCE = new Windows_1251Encoding();
}