# -*- coding: utf-8 -*-
#
# Copyright (c) 2000 Tyler C. Sarna <tsarna@sarna.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#      This product includes software developed by Tyler C. Sarna.
# 4. Neither the name of the author nor the names of contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

from reportlab.lib.units import inch
from common import MultiWidthBarcode
import string

_patterns = {
  '0' : ('AcAaAb', 0),  '1' : ('AaAbAc', 1),  '2' : ('AaAcAb', 2),
  '3' : ('AaAdAa', 3),  '4' : ('AbAaAc', 4),  '5' : ('AbAbAb', 5),
  '6' : ('AbAcAa', 6),  '7' : ('AaAaAd', 7),  '8' : ('AcAbAa', 8),
  '9' : ('AdAaAa', 9),  'A' : ('BaAaAc', 10), 'B' : ('BaAbAb', 11),
  'C' : ('BaAcAa', 12), 'D' : ('BbAaAb', 13), 'E' : ('BbAbAa', 14),
  'F' : ('BcAaAa', 15), 'G' : ('AaBaAc', 16), 'H' : ('AaBbAb', 17),
  'I' : ('AaBcAa', 18), 'J' : ('AbBaAb', 19), 'K' : ('AcBaAa', 20),
  'L' : ('AaAaBc', 21), 'M' : ('AaAbBb', 22), 'N' : ('AaAcBa', 23),
  'O' : ('AbAaBb', 24), 'P' : ('AcAaBa', 25), 'Q' : ('BaBaAb', 26),
  'R' : ('BaBbAa', 27), 'S' : ('BaAaBb', 28), 'T' : ('BaAbBa', 29),
  'U' : ('BbAaBa', 30), 'V' : ('BbBaAa', 31), 'W' : ('AaBaBb', 32),
  'X' : ('AaBbBa', 33), 'Y' : ('AbBaBa', 34), 'Z' : ('AbCaAa', 35),
  '-' : ('AbAaCa', 36), '.' : ('CaAaAb', 37), ' ' : ('CaAbAa', 38),
  '$' : ('CbAaAa', 39), '/' : ('AaBaCa', 40), '+' : ('AaCaBa', 41),
  '%' : ('BaAaCa', 42), '#' : ('AbAbBa', 43), '!' : ('CaBaAa', 44),
  '=' : ('CaAaBa', 45), '&' : ('AbBbAa', 46),
  'start' : ('AaAaDa', -1),  'stop' : ('AaAaDaA', -2)
}

_charsbyval = {}
for k, v in _patterns.items():
    _charsbyval[v[1]] = k

_extended = {
    '\x00' : '!U',    '\x01' : '#A',    '\x02' : '#B',    '\x03' : '#C',
    '\x04' : '#D',    '\x05' : '#E',    '\x06' : '#F',    '\x07' : '#G',
    '\x08' : '#H',    '\x09' : '#I',    '\x0a' : '#J',    '\x0b' : '#K',
    '\x0c' : '#L',    '\x0d' : '#M',    '\x0e' : '#N',    '\x0f' : '#O',
    '\x10' : '#P',    '\x11' : '#Q',    '\x12' : '#R',    '\x13' : '#S',
    '\x14' : '#T',    '\x15' : '#U',    '\x16' : '#V',    '\x17' : '#W',
    '\x18' : '#X',    '\x19' : '#Y',    '\x1a' : '#Z',    '\x1b' : '!A',
    '\x1c' : '!B',    '\x1d' : '!C',    '\x1e' : '!D',    '\x1f' : '!E',
    '!'    : '=A',    '"'    : '=B',    '#'    : '=C',    '$'    : '=D',
    '%'    : '=E',    '&'    : '=F',    '\''   : '=G',    '('    : '=H',
    ')'    : '=I',    '*'    : '=J',    '+'    : '=K',    ','    : '=L',
    '/'    : '=O',    ':'    : '=Z',    ';'    : '!F',    '<'    : '!G',
    '='    : '!H',    '>'    : '!I',    '?'    : '!J',    '@'    : '!V',
    '['    : '!K',    '\\'   : '!L',    ']'    : '!M',    '^'    : '!N',
    '_'    : '!O',    '`'    : '!W',    'a'    : '&A',    'b'    : '&B',
    'c'    : '&C',    'd'    : '&D',    'e'    : '&E',    'f'    : '&F',
    'g'    : '&G',    'h'    : '&H',    'i'    : '&I',    'j'    : '&J',
    'k'    : '&K',    'l'    : '&L',    'm'    : '&M',    'n'    : '&N',
    'o'    : '&O',    'p'    : '&P',    'q'    : '&Q',    'r'    : '&R',
    's'    : '&S',    't'    : '&T',    'u'    : '&U',    'v'    : '&V',
    'w'    : '&W',    'x'    : '&X',    'y'    : '&Y',    'z'    : '&Z',
    '{'    : '!P',    '|'    : '!Q',    '}'    : '!R',    '~'    : '!S',
    '\x7f' : '!T'
}


def _encode93(str):
    s = map(None, str)
    s.reverse()

    # compute 'C' checksum
    i = 0; v = 1; c = 0
    while i < len(s):
        c = c + v * _patterns[s[i]][1]
        i = i + 1; v = v + 1
        if v > 20:
            v = 1
    s.insert(0, _charsbyval[c % 47])

    # compute 'K' checksum
    i = 0; v = 1; c = 0
    while i < len(s):
        c = c + v * _patterns[s[i]][1]
        i = i + 1; v = v + 1
        if v > 15:
            v = 1
    s.insert(0, _charsbyval[c % 47])

    s.reverse()

    return string.join(s, '')


class _Code93Base(MultiWidthBarcode):
    def __init__(self, value='', **args):
        self.xdim = inch * 0.0075
        self.lquiet = None
        self.rquiet = None
        self.quiet = 1
        self.height = None

        if type(value) is type(1):
            value = str(value)
            
        for (k, v) in args.items():
            setattr(self, k, v)

        if self.quiet:
            if self.lquiet is None:
                self.lquiet = max(inch * 0.25, self.xdim * 10.0)
                self.rquiet = max(inch * 0.25, self.xdim * 10.0)
        else:
            self.lquiet = self.rquiet = 0.0

        MultiWidthBarcode.__init__(self, value)

    def decompose(self):
        dval = _patterns['start'][0]
        for c in self.encoded:
            dval = dval + _patterns[c][0]
        self.decomposed = dval + _patterns['stop'][0]
        return self.decomposed


class Standard93(_Code93Base):
    """
    Code 93 is a Uppercase alphanumeric symbology with some punctuation.
    See Extended Code 93 for a variant that can represent the entire
    128 characrter ASCII set.
    
    Options that may be passed to constructor:

        value (int, or numeric string. required.):
            The value to encode.
   
        xdim (float, default .0075):
            X-Dimension, or width of the smallest element
            Minumum is .0075 inch (7.5 mils).
            
        height (float, see default below):
            Height of the symbol.  Default is the height of the two
            bearer bars (if they exist) plus the greater of .25 inch
            or .15 times the symbol's length.

        quiet (bool, default 1):
            Wether to include quiet zones in the symbol.
            
        lquiet (float, see default below):
            Quiet zone size to left of code, if quiet is true.
            Default is the greater of .25 inch, or 10 xdim
            
        rquiet (float, defaults as above):
            Quiet zone size to right left of code, if quiet is true.

    Sources of Information on Code 93:

    http://www.semiconductor.agilent.com/barcode/sg/Misc/code_93.html

    Official Spec, "NSI/AIM BC5-1995, USS" is available for US$45 from
    http://www.aimglobal.org/aimstore/
    """

    def validate(self):
        vval = ""
        self.valid = 1
        for c in self.value:
            if c in string.lowercase:
                c = string.upper(c)
            if not _patterns.has_key(c):
                self.valid = 0
                continue
            vval = vval + c
        self.validated = vval
        return vval

    def encode(self):
        self.encoded = _encode93(self.validated)
        return self.encoded


class Extended93(_Code93Base):
    """
    Extended Code 93 is a convention for encoding the entire 128 character
    set using pairs of characters to represent the characters missing in
    Standard Code 93. It is very much like Extended Code 39 in that way.
    
    See Standard93 for arguments.
    """    

    def validate(self):
        vval = ""
        self.valid = 1
        for c in self.value:
            if not _patterns.has_key(c) and not _extended.has_key(c):
                self.valid = 0
                continue
            vval = vval + c
        self.validated = vval
        return vval

    def encode(self):
        self.encoded = ""
        for c in self.validated:
            if _patterns.has_key(c):
                self.encoded = self.encoded + c
            elif _extended.has_key(c):
                self.encoded = self.encoded + _extended[c]
            else:
                raise ValueError
        self.encoded = _encode93(self.encoded)
        return self.encoded
# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
