#!/usr/bin/env python2
# -*- coding: utf-8 -*-
#
# Copyright 2010 Zuza Software Foundation
#
# This file is part of the Translate Toolkit.
#
# 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, see <http://www.gnu.org/licenses/>.

"""Manage the Trados .txt Translation Memory format

A Trados file looks like this:

.. code-block:: xml

    <TrU>
    <CrD>18012000, 13:18:35
    <CrU>CAROL-ANN
    <UsC>0
    <Seg L=EN_GB>Association for Road Safety \endash  Conference
    <Seg L=DE_DE>Tagung der Gesellschaft für Verkehrssicherheit
    </TrU>
    <TrU>
    <CrD>18012000, 13:19:14
    <CrU>CAROL-ANN
    <UsC>0
    <Seg L=EN_GB>Road Safety Education in our Schools
    <Seg L=DE_DE>Verkehrserziehung an Schulen
    </TrU>

"""

import re
import time

try:
    # FIXME see if we can't use lxml
    from bs4 import BeautifulSoup
except ImportError:
    raise ImportError("BeautifulSoup 4 is not installed. Support for Trados txt is disabled.")

from translate.storage import base


TRADOS_TIMEFORMAT = "%d%m%Y, %H:%M:%S"
"""Time format used by Trados .txt"""

RTF_ESCAPES = {
    u"\\emdash": u"—",
    u"\\endash": u"–",
    # Nonbreaking space equal to width of character "m" in current font.
    u"\\emspace": u"\u2003",
    # Nonbreaking space equal to width of character "n" in current font.
    u"\\enspace": u"\u2002",
    #u"\\qmspace": "",    # One-quarter em space.
    u"\\bullet": u"•",     # Bullet character.
    u"\\lquote": u"‘",     # Left single quotation mark. \u2018
    u"\\rquote": u"’",     # Right single quotation mark. \u2019
    u"\\ldblquote": u"“",  # Left double quotation mark. \u201C
    u"\\rdblquote": u"”",  # Right double quotation mark. \u201D
    u"\\~": u"\u00a0",  # Nonbreaking space
    u"\\-": u"\u00ad",  # Optional hyphen.
    u"\\_": u"‑",  # Nonbreaking hyphen \U2011
    # A hexadecimal value, based on the specified character set (may be used to
    # identify 8-bit values).
    #u"\\'hh": "",
}
"""RTF control to Unicode map. See
http://msdn.microsoft.com/en-us/library/aa140283(v=office.10).aspx
"""


def unescape(text):
    """Convert Trados text to normal Unicode string"""
    for trados_escape, char in RTF_ESCAPES.iteritems():
        text = text.replace(trados_escape, char)
    return text


def escape(text):
    """Convert Unicode string to Trodas escapes"""
    for trados_escape, char in RTF_ESCAPES.iteritems():
        text = text.replace(char, trados_escape)
    return text


class TradosTxtDate(object):
    """Manages the timestamps in the Trados .txt format of DDMMYYY, hh:mm:ss"""

    def __init__(self, newtime=None):
        self._time = None
        if newtime:
            if isinstance(newtime, basestring):
                self.timestring = newtime
            elif isinstance(newtime, time.struct_time):
                self.time = newtime

    def get_timestring(self):
        """Get the time in the Trados time format"""
        if not self._time:
            return None
        else:
            return time.strftime(TRADOS_TIMEFORMAT, self._time)

    def set_timestring(self, timestring):
        """Set the time_struct object using a Trados time formated string

        :param timestring: A Trados time string (DDMMYYYY, hh:mm:ss)
        :type timestring: String
        """
        self._time = time.strptime(timestring, TRADOS_TIMEFORMAT)
    timestring = property(get_timestring, set_timestring)

    def get_time(self):
        """Get the time_struct object"""
        return self._time

    def set_time(self, newtime):
        """Set the time_struct object

        :param newtime: a new time object
        :type newtime: time.time_struct
        """
        if newtime and isinstance(newtime, time.struct_time):
            self._time = newtime
        else:
            self._time = None
    time = property(get_time, set_time)

    def __str__(self):
        if not self.timestring:
            return ""
        else:
            return self.timestring


class TradosUnit(base.TranslationUnit):

    def __init__(self, source=None):
        self._soup = None
        super(TradosUnit, self).__init__(source)

    def getsource(self):
        return unescape(self._soup.findAll('seg')[0].contents[0])
    source = property(getsource, None)

    def gettarget(self):
        return unescape(self._soup.findAll('seg')[1].contents[0])
    target = property(gettarget, None)


class TradosSoup(BeautifulSoup):

    MARKUP_MASSAGE = [
        (re.compile('<(?P<fulltag>(?P<tag>[^\s\/]+).*?)>(?P<content>.+)\r'),
         lambda x: '<%(fulltag)s>%(content)s</%(tag)s>' % x.groupdict()),
    ]


class TradosTxtTmFile(base.TranslationStore):
    """A Trados translation memory file"""
    Name = "Trados Translation Memory"
    Mimetypes = ["application/x-trados-tm"]
    Extensions = ["txt"]

    def __init__(self, inputfile=None, unitclass=TradosUnit):
        """construct a Wordfast TM, optionally reading in from inputfile."""
        self.UnitClass = unitclass
        base.TranslationStore.__init__(self, unitclass=unitclass)
        self.filename = ''
        self._encoding = 'iso-8859-1'
        if inputfile is not None:
            self.parse(inputfile)

    def parse(self, input):
        if hasattr(input, 'name'):
            self.filename = input.name
        elif not getattr(self, 'filename', ''):
            self.filename = ''
        if hasattr(input, "read"):
            tmsrc = input.read()
            input.close()
            input = tmsrc
        self._soup = TradosSoup(input)
        for tu in self._soup.findAll('tru'):
            unit = TradosUnit()
            unit._soup = TradosSoup(str(tu))
            self.addunit(unit)

    def __str__(self):
        # FIXME turn the lowercased tags back into mixed case
        return self._soup.prettify()
