/*
 * Copyright 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*namespace com.google.zxing.oned {*/
import BarcodeFormat from '../BarcodeFormat';
import ChecksumException from '../ChecksumException';
import FormatException from '../FormatException';
import NotFoundException from '../NotFoundException';
import OneDReader from './OneDReader';
import Result from '../Result';
//import com.google.zxing.ResultMetadataType;
import ResultPoint from '../ResultPoint';
/**
 * <p>Decodes Code 93 barcodes.</p>
 *
 * @author Sean Owen
 * @see Code39Reader
 */
export default class Code93Reader extends OneDReader {
    // Note that 'abcd' are dummy characters in place of control characters.
    static ALPHABET_STRING = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%abcd*";
    /**
     * These represent the encodings of characters, as patterns of wide and narrow bars.
     * The 9 least-significant bits of each int correspond to the pattern of wide and narrow.
     */
    static CHARACTER_ENCODINGS = [
        0x114, 0x148, 0x144, 0x142, 0x128, 0x124, 0x122, 0x150, 0x112, 0x10A, // 0-9
        0x1A8, 0x1A4, 0x1A2, 0x194, 0x192, 0x18A, 0x168, 0x164, 0x162, 0x134, // A-J
        0x11A, 0x158, 0x14C, 0x146, 0x12C, 0x116, 0x1B4, 0x1B2, 0x1AC, 0x1A6, // K-T
        0x196, 0x19A, 0x16C, 0x166, 0x136, 0x13A, // U-Z
        0x12E, 0x1D4, 0x1D2, 0x1CA, 0x16E, 0x176, 0x1AE, // - - %
        0x126, 0x1DA, 0x1D6, 0x132, 0x15E, // Control chars? $-*
    ];
    static ASTERISK_ENCODING = Code93Reader.CHARACTER_ENCODINGS[47];
    decodeRowResult;
    counters;
    //public Code93Reader() {
    //  decodeRowResult = new StringBuilder(20);
    //  counters = new int[6];
    //}
    constructor() {
        super();
        this.decodeRowResult = '';
        this.counters = new Int32Array(6);
    }
    decodeRow(rowNumber, row, hints) {
        let start = this.findAsteriskPattern(row);
        // Read off white space
        let nextStart = row.getNextSet(start[1]);
        let end = row.getSize();
        let theCounters = this.counters;
        theCounters.fill(0);
        this.decodeRowResult = '';
        let decodedChar;
        let lastStart;
        do {
            Code93Reader.recordPattern(row, nextStart, theCounters);
            let pattern = this.toPattern(theCounters);
            if (pattern < 0) {
                throw new NotFoundException();
            }
            decodedChar = this.patternToChar(pattern);
            this.decodeRowResult += decodedChar;
            lastStart = nextStart;
            for (let counter of theCounters) {
                nextStart += counter;
            }
            // Read off white space
            nextStart = row.getNextSet(nextStart);
        } while (decodedChar !== '*');
        this.decodeRowResult = this.decodeRowResult.substring(0, this.decodeRowResult.length - 1); // remove asterisk
        let lastPatternSize = 0;
        for (let counter of theCounters) {
            lastPatternSize += counter;
        }
        // Should be at least one more black module
        if (nextStart === end || !row.get(nextStart)) {
            throw new NotFoundException();
        }
        if (this.decodeRowResult.length < 2) {
            // false positive -- need at least 2 checksum digits
            throw new NotFoundException();
        }
        this.checkChecksums(this.decodeRowResult);
        // Remove checksum digits
        this.decodeRowResult = this.decodeRowResult.substring(0, this.decodeRowResult.length - 2);
        let resultString = this.decodeExtended(this.decodeRowResult);
        let left = (start[1] + start[0]) / 2.0;
        let right = lastStart + lastPatternSize / 2.0;
        return new Result(resultString, null, 0, [new ResultPoint(left, rowNumber), new ResultPoint(right, rowNumber)], BarcodeFormat.CODE_93, new Date().getTime());
    }
    findAsteriskPattern(row) {
        let width = row.getSize();
        let rowOffset = row.getNextSet(0);
        this.counters.fill(0);
        let theCounters = this.counters;
        let patternStart = rowOffset;
        let isWhite = false;
        let patternLength = theCounters.length;
        let counterPosition = 0;
        for (let i = rowOffset; i < width; i++) {
            if (row.get(i) !== isWhite) {
                theCounters[counterPosition]++;
            }
            else {
                if (counterPosition === patternLength - 1) {
                    if (this.toPattern(theCounters) === Code93Reader.ASTERISK_ENCODING) {
                        return new Int32Array([patternStart, i]);
                    }
                    patternStart += theCounters[0] + theCounters[1];
                    theCounters.copyWithin(0, 2, 2 + counterPosition - 1);
                    theCounters[counterPosition - 1] = 0;
                    theCounters[counterPosition] = 0;
                    counterPosition--;
                }
                else {
                    counterPosition++;
                }
                theCounters[counterPosition] = 1;
                isWhite = !isWhite;
            }
        }
        throw new NotFoundException;
    }
    toPattern(counters) {
        let sum = 0;
        for (const counter of counters) {
            sum += counter;
        }
        let pattern = 0;
        let max = counters.length;
        for (let i = 0; i < max; i++) {
            let scaled = Math.round(counters[i] * 9.0 / sum);
            if (scaled < 1 || scaled > 4) {
                return -1;
            }
            if ((i & 0x01) === 0) {
                for (let j = 0; j < scaled; j++) {
                    pattern = (pattern << 1) | 0x01;
                }
            }
            else {
                pattern <<= scaled;
            }
        }
        return pattern;
    }
    patternToChar(pattern) {
        for (let i = 0; i < Code93Reader.CHARACTER_ENCODINGS.length; i++) {
            if (Code93Reader.CHARACTER_ENCODINGS[i] === pattern) {
                return Code93Reader.ALPHABET_STRING.charAt(i);
            }
        }
        throw new NotFoundException();
    }
    decodeExtended(encoded) {
        let length = encoded.length;
        let decoded = '';
        for (let i = 0; i < length; i++) {
            let c = encoded.charAt(i);
            if (c >= 'a' && c <= 'd') {
                if (i >= length - 1) {
                    throw new FormatException();
                }
                let next = encoded.charAt(i + 1);
                let decodedChar = '\0';
                switch (c) {
                    case 'd':
                        // +A to +Z map to a to z
                        if (next >= 'A' && next <= 'Z') {
                            decodedChar = String.fromCharCode(next.charCodeAt(0) + 32);
                        }
                        else {
                            throw new FormatException();
                        }
                        break;
                    case 'a':
                        // $A to $Z map to control codes SH to SB
                        if (next >= 'A' && next <= 'Z') {
                            decodedChar = String.fromCharCode(next.charCodeAt(0) - 64);
                        }
                        else {
                            throw new FormatException();
                        }
                        break;
                    case 'b':
                        if (next >= 'A' && next <= 'E') {
                            // %A to %E map to control codes ESC to USep
                            decodedChar = String.fromCharCode(next.charCodeAt(0) - 38);
                        }
                        else if (next >= 'F' && next <= 'J') {
                            // %F to %J map to ; < = > ?
                            decodedChar = String.fromCharCode(next.charCodeAt(0) - 11);
                        }
                        else if (next >= 'K' && next <= 'O') {
                            // %K to %O map to [ \ ] ^ _
                            decodedChar = String.fromCharCode(next.charCodeAt(0) + 16);
                        }
                        else if (next >= 'P' && next <= 'T') {
                            // %P to %T map to { | } ~ DEL
                            decodedChar = String.fromCharCode(next.charCodeAt(0) + 43);
                        }
                        else if (next === 'U') {
                            // %U map to NUL
                            decodedChar = '\0';
                        }
                        else if (next === 'V') {
                            // %V map to @
                            decodedChar = '@';
                        }
                        else if (next === 'W') {
                            // %W map to `
                            decodedChar = '`';
                        }
                        else if (next >= 'X' && next <= 'Z') {
                            // %X to %Z all map to DEL (127)
                            decodedChar = String.fromCharCode(127);
                        }
                        else {
                            throw new FormatException();
                        }
                        break;
                    case 'c':
                        // /A to /O map to ! to , and /Z maps to :
                        if (next >= 'A' && next <= 'O') {
                            decodedChar = String.fromCharCode(next.charCodeAt(0) - 32);
                        }
                        else if (next === 'Z') {
                            decodedChar = ':';
                        }
                        else {
                            throw new FormatException();
                        }
                        break;
                }
                decoded += decodedChar;
                // bump up i again since we read two characters
                i++;
            }
            else {
                decoded += c;
            }
        }
        return decoded;
    }
    checkChecksums(result) {
        let length = result.length;
        this.checkOneChecksum(result, length - 2, 20);
        this.checkOneChecksum(result, length - 1, 15);
    }
    checkOneChecksum(result, checkPosition, weightMax) {
        let weight = 1;
        let total = 0;
        for (let i = checkPosition - 1; i >= 0; i--) {
            total += weight * Code93Reader.ALPHABET_STRING.indexOf(result.charAt(i));
            if (++weight > weightMax) {
                weight = 1;
            }
        }
        if (result.charAt(checkPosition) !== Code93Reader.ALPHABET_STRING[total % 47]) {
            throw new ChecksumException;
        }
    }
}
