#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2009 Kazuhiko Arase (http://www.d-project.com/)
#               2010 Bulia Byak <buliabyak@gmail.com>
#               2018 Kirill Okhotnikov <kirill.okhotnikov@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA.
#
"""
Provide the QR Code rendering.
"""

from __future__ import print_function

import sys
from itertools import product

import inkex
from inkex import Group, Rectangle, Use, PathElement


class QRCode(object):
    PAD0 = 0xEC
    PAD1 = 0x11

    def __init__(self):
        self.typeNumber = 1
        self.errorCorrectLevel = ErrorCorrectLevel.H
        self.qrDataList = []
        self.modules = []
        self.moduleCount = 0

    def getTypeNumber(self):
        return self.typeNumber

    def setTypeNumber(self, typeNumber):
        self.typeNumber = typeNumber

    def getErrorCorrectLevel(self):
        return self.errorCorrectLevel

    def setErrorCorrectLevel(self, errorCorrectLevel):
        self.errorCorrectLevel = errorCorrectLevel

    def clearData(self):
        self.qrDataList = []

    def addData(self, data):
        self.qrDataList.append(QR8BitByte(data))

    def getDataCount(self):
        return len(self.qrDataList)

    def getData(self, index):
        return self.qrDataList[index]

    def isDark(self, row, col):
        return (self.modules[row][col] if self.modules[row][col] is not None
                else False)

    def getModuleCount(self):
        return self.moduleCount

    def make(self):
        self._make(False, self._getBestMaskPattern())

    def _getBestMaskPattern(self):
        minLostPoint = 0
        pattern = 0
        for i in range(8):
            self._make(True, i)
            lostPoint = QRUtil.getLostPoint(self)
            if i == 0 or minLostPoint > lostPoint:
                minLostPoint = lostPoint
                pattern = i
        return pattern

    def _make(self, test, maskPattern):

        self.moduleCount = self.typeNumber * 4 + 17
        self.modules = [[None] * self.moduleCount
                        for i in range(self.moduleCount)]

        self._setupPositionProbePattern(0, 0)
        self._setupPositionProbePattern(self.moduleCount - 7, 0)
        self._setupPositionProbePattern(0, self.moduleCount - 7)

        self._setupPositionAdjustPattern()
        self._setupTimingPattern()

        self._setupTypeInfo(test, maskPattern)

        if self.typeNumber >= 7:
            self._setupTypeNumber(test)

        data = QRCode._createData(
                self.typeNumber,
                self.errorCorrectLevel,
                self.qrDataList)

        self._mapData(data, maskPattern)

    def _mapData(self, data, maskPattern):

        rows = list(range(self.moduleCount))
        cols = [col - 1 if col <= 6 else col
                for col in range(self.moduleCount - 1, 0, -2)]
        maskFunc = QRUtil.getMaskFunction(maskPattern)

        byteIndex = 0
        bitIndex = 7

        for col in cols:
            rows.reverse()
            for row in rows:
                for c in range(2):
                    if self.modules[row][col - c] is None:

                        dark = False
                        if byteIndex < len(data):
                            dark = ((data[byteIndex] >> bitIndex) & 1) == 1
                        if maskFunc(row, col - c):
                            dark = not dark
                        self.modules[row][col - c] = dark

                        bitIndex -= 1
                        if bitIndex == -1:
                            byteIndex += 1
                            bitIndex = 7

    def _setupPositionAdjustPattern(self):
        pos = QRUtil.getPatternPosition(self.typeNumber)
        for row in pos:
            for col in pos:
                if self.modules[row][col] is not None:
                    continue
                for r in range(-2, 3):
                    for c in range(-2, 3):
                        self.modules[row + r][col + c] = (
                                r == -2 or r == 2 or c == -2 or c == 2
                                or (r == 0 and c == 0))

    def _setupPositionProbePattern(self, row, col):
        for r in range(-1, 8):
            for c in range(-1, 8):
                if (row + r <= -1 or self.moduleCount <= row + r
                        or col + c <= -1 or self.moduleCount <= col + c):
                    continue
                self.modules[row + r][col + c] = (
                        (0 <= r <= 6 and (c == 0 or c == 6))
                        or (0 <= c <= 6 and (r == 0 or r == 6))
                        or (2 <= r <= 4 and 2 <= c <= 4))

    def _setupTimingPattern(self):
        for r in range(8, self.moduleCount - 8):
            if self.modules[r][6] is not None:
                continue
            self.modules[r][6] = r % 2 == 0
        for c in range(8, self.moduleCount - 8):
            if self.modules[6][c] is not None:
                continue
            self.modules[6][c] = c % 2 == 0

    def _setupTypeNumber(self, test):
        bits = QRUtil.getBCHTypeNumber(self.typeNumber)
        for i in range(18):
            self.modules[i // 3][i % 3 + self.moduleCount - 8 - 3] = (
                    not test and ((bits >> i) & 1) == 1)
        for i in range(18):
            self.modules[i % 3 + self.moduleCount - 8 - 3][i // 3] = (
                    not test and ((bits >> i) & 1) == 1)

    def _setupTypeInfo(self, test, maskPattern):

        data = (self.errorCorrectLevel << 3) | maskPattern
        bits = QRUtil.getBCHTypeInfo(data)

        # vertical
        for i in range(15):
            mod = not test and ((bits >> i) & 1) == 1
            if i < 6:
                self.modules[i][8] = mod
            elif i < 8:
                self.modules[i + 1][8] = mod
            else:
                self.modules[self.moduleCount - 15 + i][8] = mod

        # horizontal
        for i in range(15):
            mod = not test and ((bits >> i) & 1) == 1
            if i < 8:
                self.modules[8][self.moduleCount - i - 1] = mod
            elif i < 9:
                self.modules[8][15 - i - 1 + 1] = mod
            else:
                self.modules[8][15 - i - 1] = mod

        # fixed
        self.modules[self.moduleCount - 8][8] = not test

    @staticmethod
    def _createData(typeNumber, errorCorrectLevel, dataArray):

        rsBlocks = RSBlock.getRSBlocks(typeNumber, errorCorrectLevel)

        buffer = BitBuffer()

        for data in dataArray:
            buffer.put(data.getMode(), 4)
            buffer.put(data.getLength(), data.getLengthInBits(typeNumber))
            data.write(buffer)

        totalDataCount = sum(rsBlock.getDataCount()
                             for rsBlock in rsBlocks)

        if buffer.getLengthInBits() > totalDataCount * 8:
            raise Exception('code length overflow. (%s>%s)' %
                            (buffer.getLengthInBits(), totalDataCount * 8))

        # end code
        if buffer.getLengthInBits() + 4 <= totalDataCount * 8:
            buffer.put(0, 4)

        # padding
        while buffer.getLengthInBits() % 8 != 0:
            buffer.put(False)

        # padding
        while True:
            if buffer.getLengthInBits() >= totalDataCount * 8:
                break
            buffer.put(QRCode.PAD0, 8)
            if buffer.getLengthInBits() >= totalDataCount * 8:
                break
            buffer.put(QRCode.PAD1, 8)

        return QRCode._createBytes(buffer, rsBlocks)

    @staticmethod
    def _createBytes(buffer, rsBlocks):

        offset = 0

        maxDcCount = 0
        maxEcCount = 0

        dcdata = [None] * len(rsBlocks)
        ecdata = [None] * len(rsBlocks)

        for r in range(len(rsBlocks)):

            dcCount = rsBlocks[r].getDataCount()
            ecCount = rsBlocks[r].getTotalCount() - dcCount

            maxDcCount = max(maxDcCount, dcCount)
            maxEcCount = max(maxEcCount, ecCount)

            dcdata[r] = [0] * dcCount
            for i in range(len(dcdata[r])):
                dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset]
            offset += dcCount

            rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount)
            rawPoly = Polynomial(dcdata[r], rsPoly.getLength() - 1)

            modPoly = rawPoly.mod(rsPoly)
            ecdata[r] = [0] * (rsPoly.getLength() - 1)
            for i in range(len(ecdata[r])):
                modIndex = i + modPoly.getLength() - len(ecdata[r])
                ecdata[r][i] = modPoly.get(modIndex) if modIndex >= 0 else 0

        totalCodeCount = sum(rsBlock.getTotalCount()
                             for rsBlock in rsBlocks)

        data = [0] * totalCodeCount

        index = 0

        for i in range(maxDcCount):
            for r in range(len(rsBlocks)):
                if i < len(dcdata[r]):
                    data[index] = dcdata[r][i]
                    index += 1

        for i in range(maxEcCount):
            for r in range(len(rsBlocks)):
                if i < len(ecdata[r]):
                    data[index] = ecdata[r][i]
                    index += 1

        return data

    @staticmethod
    def getMinimumQRCode(data, errorCorrectLevel):
        mode = Mode.MODE_8BIT_BYTE  # fixed to 8bit byte
        qr = QRCode()
        qr.setErrorCorrectLevel(errorCorrectLevel)
        qr.addData(data)
        length = qr.getData(0).getLength()
        for typeNumber in range(1, 11):
            if length <= QRUtil.getMaxLength(
                    typeNumber, mode, errorCorrectLevel):
                qr.setTypeNumber(typeNumber)
                break
        qr.make()
        return qr


class Mode(object):
    MODE_NUMBER = 1 << 0
    MODE_ALPHA_NUM = 1 << 1
    MODE_8BIT_BYTE = 1 << 2
    MODE_KANJI = 1 << 3


class ErrorCorrectLevel(object):
    L = 1  # 7%
    M = 0  # 15%
    Q = 3  # 25%
    H = 2  # 30%


class MaskPattern(object):
    PATTERN000 = 0
    PATTERN001 = 1
    PATTERN010 = 2
    PATTERN011 = 3
    PATTERN100 = 4
    PATTERN101 = 5
    PATTERN110 = 6
    PATTERN111 = 7


class QRUtil(object):
    @staticmethod
    def getPatternPosition(typeNumber):
        return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1]

    PATTERN_POSITION_TABLE = [
        [],
        [6, 18],
        [6, 22],
        [6, 26],
        [6, 30],
        [6, 34],
        [6, 22, 38],
        [6, 24, 42],
        [6, 26, 46],
        [6, 28, 50],
        [6, 30, 54],
        [6, 32, 58],
        [6, 34, 62],
        [6, 26, 46, 66],
        [6, 26, 48, 70],
        [6, 26, 50, 74],
        [6, 30, 54, 78],
        [6, 30, 56, 82],
        [6, 30, 58, 86],
        [6, 34, 62, 90],
        [6, 28, 50, 72, 94],
        [6, 26, 50, 74, 98],
        [6, 30, 54, 78, 102],
        [6, 28, 54, 80, 106],
        [6, 32, 58, 84, 110],
        [6, 30, 58, 86, 114],
        [6, 34, 62, 90, 118],
        [6, 26, 50, 74, 98, 122],
        [6, 30, 54, 78, 102, 126],
        [6, 26, 52, 78, 104, 130],
        [6, 30, 56, 82, 108, 134],
        [6, 34, 60, 86, 112, 138],
        [6, 30, 58, 86, 114, 142],
        [6, 34, 62, 90, 118, 146],
        [6, 30, 54, 78, 102, 126, 150],
        [6, 24, 50, 76, 102, 128, 154],
        [6, 28, 54, 80, 106, 132, 158],
        [6, 32, 58, 84, 110, 136, 162],
        [6, 26, 54, 82, 110, 138, 166],
        [6, 30, 58, 86, 114, 142, 170]
    ]

    MAX_LENGTH = [
        [[41, 25, 17, 10], [34, 20, 14, 8], [27, 16, 11, 7], [17, 10, 7, 4]],
        [[77, 47, 32, 20], [63, 38, 26, 16], [48, 29, 20, 12], [34, 20, 14, 8]],
        [[127, 77, 53, 32], [101, 61, 42, 26], [77, 47, 32, 20], [58, 35, 24, 15]],
        [[187, 114, 78, 48], [149, 90, 62, 38], [111, 67, 46, 28], [82, 50, 34, 21]],
        [[255, 154, 106, 65], [202, 122, 84, 52], [144, 87, 60, 37], [106, 64, 44, 27]],
        [[322, 195, 134, 82], [255, 154, 106, 65], [178, 108, 74, 45], [139, 84, 58, 36]],
        [[370, 224, 154, 95], [293, 178, 122, 75], [207, 125, 86, 53], [154, 93, 64, 39]],
        [[461, 279, 192, 118], [365, 221, 152, 93], [259, 157, 108, 66], [202, 122, 84, 52]],
        [[552, 335, 230, 141], [432, 262, 180, 111], [312, 189, 130, 80], [235, 143, 98, 60]],
        [[652, 395, 271, 167], [513, 311, 213, 131], [364, 221, 151, 93], [288, 174, 119, 74]]
    ]

    @staticmethod
    def getMaxLength(typeNumber, mode, errorCorrectLevel):
        t = typeNumber - 1
        e = {
            ErrorCorrectLevel.L: 0,
            ErrorCorrectLevel.M: 1,
            ErrorCorrectLevel.Q: 2,
            ErrorCorrectLevel.H: 3
        }[errorCorrectLevel]
        m = {
            Mode.MODE_NUMBER: 0,
            Mode.MODE_ALPHA_NUM: 1,
            Mode.MODE_8BIT_BYTE: 2,
            Mode.MODE_KANJI: 3
        }[mode]
        return QRUtil.MAX_LENGTH[t][e][m]

    @staticmethod
    def getErrorCorrectPolynomial(errorCorrectLength):
        a = Polynomial([1])
        for i in range(errorCorrectLength):
            a = a.multiply(Polynomial([1, QRMath.gexp(i)]))
        return a

    @staticmethod
    def getMaskFunction(maskPattern):
        return {
            MaskPattern.PATTERN000:
                lambda i, j: (i + j) % 2 == 0,
            MaskPattern.PATTERN001:
                lambda i, j: i % 2 == 0,
            MaskPattern.PATTERN010:
                lambda i, j: j % 3 == 0,
            MaskPattern.PATTERN011:
                lambda i, j: (i + j) % 3 == 0,
            MaskPattern.PATTERN100:
                lambda i, j: (i // 2 + j // 3) % 2 == 0,
            MaskPattern.PATTERN101:
                lambda i, j: (i * j) % 2 + (i * j) % 3 == 0,
            MaskPattern.PATTERN110:
                lambda i, j: ((i * j) % 2 + (i * j) % 3) % 2 == 0,
            MaskPattern.PATTERN111:
                lambda i, j: ((i * j) % 3 + (i + j) % 2) % 2 == 0
        }[maskPattern]

    @staticmethod
    def getLostPoint(qrcode):

        moduleCount = qrcode.getModuleCount()
        lostPoint = 0

        # LEVEL1
        for row in range(moduleCount):
            for col in range(moduleCount):
                sameCount = 0
                dark = qrcode.isDark(row, col)
                for r in range(-1, 2):
                    if row + r < 0 or moduleCount <= row + r:
                        continue
                    for c in range(-1, 2):
                        if col + c < 0 or moduleCount <= col + c:
                            continue
                        if r == 0 and c == 0:
                            continue
                        if dark == qrcode.isDark(row + r, col + c):
                            sameCount += 1
                if sameCount > 5:
                    lostPoint += (3 + sameCount - 5)

        # LEVEL2
        for row in range(moduleCount - 1):
            for col in range(moduleCount - 1):
                count = 0
                if qrcode.isDark(row, col):
                    count += 1
                if qrcode.isDark(row + 1, col):
                    count += 1
                if qrcode.isDark(row, col + 1):
                    count += 1
                if qrcode.isDark(row + 1, col + 1):
                    count += 1
                if count == 0 or count == 4:
                    lostPoint += 3

        # LEVEL3
        for row in range(moduleCount):
            for col in range(moduleCount - 6):
                if (qrcode.isDark(row, col)
                        and not qrcode.isDark(row, col + 1)
                        and qrcode.isDark(row, col + 2)
                        and qrcode.isDark(row, col + 3)
                        and qrcode.isDark(row, col + 4)
                        and not qrcode.isDark(row, col + 5)
                        and qrcode.isDark(row, col + 6)):
                    lostPoint += 40

        for col in range(moduleCount):
            for row in range(moduleCount - 6):
                if (qrcode.isDark(row, col)
                        and not qrcode.isDark(row + 1, col)
                        and qrcode.isDark(row + 2, col)
                        and qrcode.isDark(row + 3, col)
                        and qrcode.isDark(row + 4, col)
                        and not qrcode.isDark(row + 5, col)
                        and qrcode.isDark(row + 6, col)):
                    lostPoint += 40

        # LEVEL4
        darkCount = 0
        for col in range(moduleCount):
            for row in range(moduleCount):
                if qrcode.isDark(row, col):
                    darkCount += 1

        ratio = abs(100 * darkCount // moduleCount // moduleCount - 50) // 5
        lostPoint += ratio * 10

        return lostPoint

    G15 = ((1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) |
           (1 << 2) | (1 << 1) | (1 << 0))
    G18 = ((1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) |
           (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0))
    G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1)

    @staticmethod
    def getBCHTypeInfo(data):
        d = data << 10
        while QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0:
            d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) -
                                 QRUtil.getBCHDigit(QRUtil.G15)))
        return ((data << 10) | d) ^ QRUtil.G15_MASK

    @staticmethod
    def getBCHTypeNumber(data):
        d = data << 12
        while QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0:
            d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) -
                                 QRUtil.getBCHDigit(QRUtil.G18)))
        return (data << 12) | d

    @staticmethod
    def getBCHDigit(data):
        digit = 0
        while data != 0:
            digit += 1
            data >>= 1
        return digit

    @staticmethod
    def stringToBytes(s):
        return [ord(c) & 0xff for c in s]


class QR8BitByte(object):

    def __init__(self, data):
        self.mode = Mode.MODE_8BIT_BYTE
        self.data = data

    def getMode(self):
        return self.mode

    def getData(self):
        return self.data

    '''
    def write(self, buffer): raise Exception('not implemented.')
    def getLength(self): raise Exception('not implemented.')
    '''

    def write(self, buffer):
        data = QRUtil.stringToBytes(self.getData())
        for d in data:
            buffer.put(d, 8)

    def getLength(self):
        return len(QRUtil.stringToBytes(self.getData()))

    def getLengthInBits(self, type):
        if 1 <= type < 10:  # 1 - 9
            return {
                Mode.MODE_NUMBER: 10,
                Mode.MODE_ALPHA_NUM: 9,
                Mode.MODE_8BIT_BYTE: 8,
                Mode.MODE_KANJI: 8
            }[self.mode]

        elif type < 27:  # 10 - 26
            return {
                Mode.MODE_NUMBER: 12,
                Mode.MODE_ALPHA_NUM: 11,
                Mode.MODE_8BIT_BYTE: 16,
                Mode.MODE_KANJI: 10
            }[self.mode]

        elif type < 41:  # 27 - 40
            return {
                Mode.MODE_NUMBER: 14,
                Mode.MODE_ALPHA_NUM: 13,
                Mode.MODE_8BIT_BYTE: 16,
                Mode.MODE_KANJI: 12
            }[self.mode]

        else:
            raise Exception('type:%s' % type)


class QRMath(object):
    EXP_TABLE = None
    LOG_TABLE = None

    @staticmethod
    def _init():

        QRMath.EXP_TABLE = [0] * 256
        for i in range(256):
            QRMath.EXP_TABLE[i] = (1 << i if i < 8 else
                                   QRMath.EXP_TABLE[i - 4] ^ QRMath.EXP_TABLE[i - 5] ^
                                   QRMath.EXP_TABLE[i - 6] ^ QRMath.EXP_TABLE[i - 8])

        QRMath.LOG_TABLE = [0] * 256
        for i in range(255):
            QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i

    @staticmethod
    def glog(n):
        if n < 1:
            raise Exception('log(%s)' % n)
        return QRMath.LOG_TABLE[n]

    @staticmethod
    def gexp(n):
        while n < 0:
            n += 255
        while n >= 256:
            n -= 255
        return QRMath.EXP_TABLE[n]


# initialize statics
QRMath._init()


class Polynomial(object):
    def __init__(self, num, shift=0):
        offset = 0
        length = len(num)
        while offset < length and num[offset] == 0:
            offset += 1
        self.num = num[offset:] + [0] * shift

    def get(self, index):
        return self.num[index]

    def getLength(self):
        return len(self.num)

    def __repr__(self):
        return ','.join([str(self.get(i))
                         for i in range(self.getLength())])

    def toLogString(self):
        return ','.join([str(QRMath.glog(self.get(i)))
                         for i in range(self.getLength())])

    def multiply(self, e):
        num = [0] * (self.getLength() + e.getLength() - 1)
        for i in range(self.getLength()):
            for j in range(e.getLength()):
                num[i + j] ^= QRMath.gexp(QRMath.glog(self.get(i)) +
                                          QRMath.glog(e.get(j)))
        return Polynomial(num)

    def mod(self, e):
        if self.getLength() - e.getLength() < 0:
            return self
        ratio = QRMath.glog(self.get(0)) - QRMath.glog(e.get(0))
        num = self.num[:]
        for i in range(e.getLength()):
            num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio)
        return Polynomial(num).mod(e)


class RSBlock(object):
    RS_BLOCK_TABLE = [

        # L
        # M
        # Q
        # H

        # 1
        [1, 26, 19],
        [1, 26, 16],
        [1, 26, 13],
        [1, 26, 9],

        # 2
        [1, 44, 34],
        [1, 44, 28],
        [1, 44, 22],
        [1, 44, 16],

        # 3
        [1, 70, 55],
        [1, 70, 44],
        [2, 35, 17],
        [2, 35, 13],

        # 4
        [1, 100, 80],
        [2, 50, 32],
        [2, 50, 24],
        [4, 25, 9],

        # 5
        [1, 134, 108],
        [2, 67, 43],
        [2, 33, 15, 2, 34, 16],
        [2, 33, 11, 2, 34, 12],

        # 6
        [2, 86, 68],
        [4, 43, 27],
        [4, 43, 19],
        [4, 43, 15],

        # 7
        [2, 98, 78],
        [4, 49, 31],
        [2, 32, 14, 4, 33, 15],
        [4, 39, 13, 1, 40, 14],

        # 8
        [2, 121, 97],
        [2, 60, 38, 2, 61, 39],
        [4, 40, 18, 2, 41, 19],
        [4, 40, 14, 2, 41, 15],

        # 9
        [2, 146, 116],
        [3, 58, 36, 2, 59, 37],
        [4, 36, 16, 4, 37, 17],
        [4, 36, 12, 4, 37, 13],

        # 10
        [2, 86, 68, 2, 87, 69],
        [4, 69, 43, 1, 70, 44],
        [6, 43, 19, 2, 44, 20],
        [6, 43, 15, 2, 44, 16]
    ]

    def __init__(self, totalCount, dataCount):
        self.totalCount = totalCount
        self.dataCount = dataCount

    def getDataCount(self):
        return self.dataCount

    def getTotalCount(self):
        return self.totalCount

    def __repr__(self):
        return '(total=%s,data=%s)' % (self.totalCount, self.dataCount)

    @staticmethod
    def getRSBlocks(typeNumber, errorCorrectLevel):
        rsBlock = RSBlock.getRsBlockTable(typeNumber, errorCorrectLevel)
        length = len(rsBlock) // 3
        list = []
        for i in range(length):
            count = rsBlock[i * 3 + 0]
            totalCount = rsBlock[i * 3 + 1]
            dataCount = rsBlock[i * 3 + 2]
            list += [RSBlock(totalCount, dataCount)] * count
        return list

    @staticmethod
    def getRsBlockTable(typeNumber, errorCorrectLevel):
        return {
            ErrorCorrectLevel.L:
                RSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0],
            ErrorCorrectLevel.M:
                RSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1],
            ErrorCorrectLevel.Q:
                RSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2],
            ErrorCorrectLevel.H:
                RSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3]
        }[errorCorrectLevel]


class BitBuffer(object):
    def __init__(self, inclements=32):
        self.inclements = inclements
        self.buffer = [0] * self.inclements
        self.length = 0

    def getBuffer(self):
        return self.buffer

    def getLengthInBits(self):
        return self.length

    def get(self, index):
        return ((self.buffer[index // 8] >> (7 - index % 8)) & 1) == 1

    def putBit(self, bit):
        if self.length == len(self.buffer) * 8:
            self.buffer += [0] * self.inclements
        if bit:
            self.buffer[self.length // 8] |= (0x80 >> (self.length % 8))
        self.length += 1

    def put(self, num, length):
        for i in range(length):
            self.putBit(((num >> (length - i - 1)) & 1) == 1)

    def __repr__(self):
        return ''.join('1' if self.get(i) else '0'
                       for i in range(self.getLengthInBits()))


class GridDrawer(object):
    def __init__(self, boxsize, invert_code, smooth_factor, symbol_id, margin=4):
        self.boxsize = boxsize
        self.invertCode = invert_code
        self.smoothFactor = smooth_factor
        self.symbolId = symbol_id
        self.margin = margin

        self.grid = None

    def setGrid(self, grid):
        if len({len(g) for g in grid}) != 1:
            raise Exception("The array is not rectangular")
        else:
            self.grid = grid

    def rowCount(self):
        return len(self.grid) if self.grid is not None else 0

    def colCount(self):
        return len(self.grid[0]) if self.rowCount() > 0 else 0

    def isDark(self, col, row):
        inside = col >= 0 and 0 <= row < self.rowCount() and col < self.colCount()
        return False if not inside else self.grid[row][col] != self.invertCode

    def getSVGPos(self, col, row):
        return (col + self.margin) * self.boxsize, (row + self.margin) * self.boxsize

    def makeSVGRect(self, grp):
        for r in range(self.rowCount()):
            for c in range(self.colCount()):
                if self.isDark(c, r):
                    x, y = self.getSVGPos(c, r)
                    rect = Rectangle()
                    rect.set('x', str(x))
                    rect.set('y', str(y))
                    rect.set('width', str(self.boxsize))
                    rect.set('height', str(self.boxsize))
                    grp.append(rect)

    def makeSVGSymbol(self, grp):
        for r in range(self.rowCount()):
            for c in range(self.colCount()):
                if self.isDark(c, r):
                    x, y = self.getSVGPos(c, r)
                    symbol = Use()
                    symbol.set('xlink:href', self.symbolId)
                    symbol.set('x', str(x))
                    symbol.set('y', str(y))
                    symbol.set('width', str(self.boxsize))
                    symbol.set('height', str(self.boxsize))
                    grp.append(symbol)

    def getIconPathStr(self, pointStr):
        result = ""
        digBuffer = ""
        for c in pointStr:
            if c.isdigit() or c == "-" or c == '.':
                digBuffer += c
            else:
                if len(digBuffer) > 0:
                    result += str(float(digBuffer) * self.boxsize)
                    digBuffer = ""
                result += c

        if len(digBuffer) > 0:
            result += str(float(digBuffer) * self.boxsize)

        return result

    def makeSVGPath(self, grp, pointStr):
        singlePath = self.getIconPathStr(pointStr)
        pathStr = ""
        for r in range(self.rowCount()):
            for c in range(self.colCount()):
                if self.isDark(c, r):
                    x, y = self.getSVGPos(c, r)
                    pathStr += "M %f,%f " % (x, y) + singlePath + " z "

        path = PathElement()
        path.set('d', pathStr)
        grp.append(path)

    def makeSVGCircle(self, grp):
        s = 'm 0.5,0.5 ' \
            'c 0.2761423745,0 0.5,0.2238576255 0.5,0.5 ' \
            'c 0,0.2761423745 -0.2238576255,0.5 -0.5,0.5 ' \
            'c -0.2761423745,0 -0.5,-0.2238576255 -0.5,-0.5 ' \
            'c 0,-0.2761423745 0.2238576255,-0.5 0.5,-0.5'
        self.makeSVGPath(grp, s)

    @staticmethod
    def moveByDirection(xyd):
        dm = {0: (1, 0), 1: (0, -1), 2: (-1, 0), 3: (0, 1)}
        return xyd[0] + dm[xyd[2]][0], xyd[1] + dm[xyd[2]][1]

    @staticmethod
    def makeDirectionsTable():
        result = []
        for cfg in product(range(2), repeat=4):
            result.append([])
            for d in range(4):
                if cfg[3 - d] == 0 and cfg[3 - (d - 1) % 4] != 0:
                    result[-1].append(d)
        return result

    def createVertexesForAdvDrawer(self):
        dirTable = self.makeDirectionsTable()
        result = []
        # Create vertex
        for r in range(self.rowCount() + 1):
            for c in range(self.colCount() + 1):
                indx = (2 ** 0 if self.isDark(c - 0, r - 1) else 0) + \
                       (2 ** 1 if self.isDark(c - 1, r - 1) else 0) + \
                       (2 ** 2 if self.isDark(c - 1, r - 0) else 0) + \
                       (2 ** 3 if self.isDark(c - 0, r - 0) else 0)

                for d in dirTable[indx]:
                    result.append((c, r, d, len(dirTable[indx]) > 1))

        return result

    def getSmoothPosition(self, v, extraSmoothFactor=1.0):
        vn = self.moveByDirection(v)
        sc = extraSmoothFactor * self.smoothFactor / 2.0
        sc1 = 1.0 - sc
        return (v[0] * sc1 + vn[0] * sc, v[1] * sc1 + vn[1] * sc), (v[0] * sc + vn[0] * sc1, v[1] * sc + vn[1] * sc1)

    def makeSVGAdv(self, grp, greedy):

        verts = self.createVertexesForAdvDrawer()
        qrPathStr = ""
        while len(verts) > 0:
            vertsIndexStart = len(verts) - 1
            vertsIndexCur = vertsIndexStart
            ringIndexes = []
            while True:
                ringIndexes.append(vertsIndexCur)
                nextPos = self.moveByDirection(verts[vertsIndexCur])
                nextIndexes = [i for i, x in enumerate(verts) if x[0] == nextPos[0] and x[1] == nextPos[1]]
                if len(nextIndexes) == 0 or len(nextIndexes) > 2:
                    raise Exception("Vertex " + str(next_c) + " has no connections")
                elif len(nextIndexes) == 1:
                    vertsIndexNext = nextIndexes[0]
                else:
                    if {verts[nextIndexes[0]][2], verts[nextIndexes[1]][2]} != {(verts[vertsIndexCur][2] - 1) % 4, (verts[vertsIndexCur][2] + 1) % 4}:
                        raise Exception("Bad next vertex directions " + str(verts[nextIndexes[0]]) + str(verts[nextIndexes[1]]))

                    # Greedy - CCW turn, proud and neutral CW turn
                    vertsIndexNext = nextIndexes[0] if (greedy == "g") == (verts[nextIndexes[0]][2] == (verts[vertsIndexCur][2] + 1) % 4) else nextIndexes[1]

                if vertsIndexNext == vertsIndexStart:
                    break

                vertsIndexCur = vertsIndexNext

            posStart, _ = self.getSmoothPosition(verts[ringIndexes[0]])
            qrPathStr += "M %f,%f " % self.getSVGPos(posStart[0], posStart[1])
            for ri in range(len(ringIndexes)):
                vc = verts[ringIndexes[ri]]
                vn = verts[ringIndexes[(ri + 1) % len(ringIndexes)]]
                if vn[2] != vc[2]:
                    if (greedy != "n") or not vn[3]:
                        # Add bezier
                        # Opt length http://spencermortensen.com/articles/bezier-circle/
                        # c = 0.552284749
                        ex = 1 - 0.552284749
                        _, bs = self.getSmoothPosition(vc)
                        _, bp1 = self.getSmoothPosition(vc, ex)
                        bp2, _ = self.getSmoothPosition(vn, ex)
                        bf, _ = self.getSmoothPosition(vn)
                        qrPathStr += "L %f,%f " % self.getSVGPos(bs[0], bs[1])
                        qrPathStr += "C %f,%f %f,%f %f,%f " \
                                     % (self.getSVGPos(bp1[0], bp1[1]) + self.getSVGPos(bp2[0], bp2[1]) +
                                        self.getSVGPos(bf[0], bf[1]))
                    else:
                        # Add straight
                        qrPathStr += "L %f,%f " % self.getSVGPos(vn[0], vn[1])

            qrPathStr += "z "

            # Delete already processed vertex
            for i in sorted(ringIndexes, reverse=True):
                del verts[i]

        path = PathElement()
        path.set('d', qrPathStr)
        grp.append(path)

    def getSVGDrawer(self, drawtype):
        drawerDict = {"neutral": lambda g: self.makeSVGAdv(g, "n"),
                      "greedy": lambda g: self.makeSVGAdv(g, "g"),
                      "proud": lambda g: self.makeSVGAdv(g, "p"),
                      "simple": lambda g: self.makeSVGPath(g, "h 1 v 1 h -1"),
                      "circle": self.makeSVGCircle,
                      "pathcustom": lambda g: self.makeSVGPath(g, self.symbolId),
                      "symbol": self.makeSVGSymbol,
                      "obsolete": self.makeSVGRect
                      }
        return drawerDict.get(drawtype)

    def makeSVG(self, grp, drawtype):
        drawer = self.getSVGDrawer(drawtype)
        if drawer is None:
            raise Exception("Unknown draw type: " + drawtype)

        canvas_width = (self.colCount() + 2 * self.margin) * self.boxsize
        canvas_height = (self.rowCount() + 2 * self.margin) * self.boxsize

        # white background providing margin:
        rect = Rectangle()
        rect.set('x', '0')
        rect.set('y', '0')
        rect.set('width', str(canvas_width))
        rect.set('height', str(canvas_height))
        rect.set('style', 'fill:%s;stroke:none' % ("black" if self.invertCode else "white"))
        grp.append(rect)

        qrg = Group()
        qrg.set('style', 'fill:%s;stroke:none' % ("white" if self.invertCode else "black"))
        drawer(qrg)

        grp.append(qrg)


class QrCode(inkex.GenerateExtension):
    def add_arguments(self, pars):
        pars.add_argument("--text", default='www.inkscape.org')
        pars.add_argument("--typenumber", type=int, default=0)
        pars.add_argument("--correctionlevel", type=int, default=0)
        pars.add_argument("--encoding", default="latin_1")
        pars.add_argument("--modulesize", type=float, default=10.0)
        pars.add_argument("--invert", type=inkex.Boolean, default="false")
        pars.add_argument("--drawtype", default="greedy")
        pars.add_argument("--smoothval", type=float, default=0.2)
        pars.add_argument("--symbolid", default='')

    def generate(self):

        scale = self.svg.unittouu('1px')  # convert to document units
        so = self.options

        if so.text == '':  # abort if converting blank text
            inkex.errormsg('Please enter an input text')
        elif so.drawtype == "symbol" and so.symbolid == "":
            inkex.errormsg('Please enter symbol id')
        else:
            # Python 2 and 3 compatibility.
            if sys.version_info >= (3, 0, 0):
                # for Python 3 ugly hack to represent bytes as str for Python2 compatibility
                text_bytes = bytes(so.text, so.encoding).decode("latin_1")
                text_str = str(so.text)
            else:
                text_bytes = so.text
                text_str = so.text.decode('utf-8')

            grp = Group()
            grp.set('inkscape:label', 'QR Code: ' + text_str)
            pos_x, pos_y = self.svg.namedview.center
            grp.transform.add_translate(pos_x, pos_y)
            if scale:
                grp.transform.add_scale(scale)

            # GENERATE THE QRCODE
            if so.typenumber == 0:
                # Automatic QR code size`
                qr = QRCode.getMinimumQRCode(text_bytes, so.correctionlevel)
            else:
                # Manual QR code size
                qr = QRCode()
                qr.setTypeNumber(int(so.typenumber))
                qr.setErrorCorrectLevel(so.correctionlevel)
                qr.addData(text_bytes)
                qr.make()

            qrDraw = GridDrawer(so.modulesize, so.invert, so.smoothval, so.symbolid, 4)
            qrDraw.setGrid(qr.modules)
            qrDraw.makeSVG(grp, so.drawtype)
            return grp


if __name__ == '__main__':
    QrCode().run()
