# Copyright (C) 2007, 2008 One Laptop Per Child
#
# 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 St, Fifth Floor, Boston, MA  02110-1301  USA
#
#
# The language config is based on the system-config-language
# (http://fedoraproject.org/wiki/SystemConfig/language) tool
# Parts of the code were reused.
#

import os
from gettext import gettext as _
import subprocess

_default_lang = 'en_US.utf8'
_standard_msg = _("Could not access ~/.i18n. Create standard settings.")

def read_all_languages():
    fdp = subprocess.Popen(['locale', '-av'], stdout=subprocess.PIPE)
    lines = fdp.stdout.read().split('\n')
    locales = []

    for line in lines:
        if line.find('locale:') != -1:
            locale = line.lstrip('locale:')
            locale = locale.split('archive:')[0].strip()
        elif line.find('language |') != -1:
            lang = line.lstrip('language |')
        elif line.find('territory |') != -1:
            territory = line.lstrip('territory |')
            if locale.endswith('utf8') and len(lang):
                locales.append((lang, territory, locale))

    locales.sort()
    return locales

def _initialize():      
    languages = read_all_languages()
    set_language.__doc__ += '\n'
    for lang in languages:
        set_language.__doc__ += '%s \n' % (lang[0].replace(' ', '_') + '/' + 
                                           lang[1].replace(' ', '_'))
        
def _write_i18n(lang):
    path = os.path.join(os.environ.get("HOME"), '.i18n')
    if os.access(path, os.W_OK) == 0:
        print _standard_msg
        fd = open(path, 'w')
        fd.write('LANG="%s"\n' % _default_lang)
        fd.close()
    else:
        fd = open(path, 'r')
        lines = fd.readlines()
        fd.close()        
        for i in range(len(lines)):
            if lines[i][:5] == "LANG=":                
                lines[i] = 'LANG="%s"\n' % lang                                 
                fd = open(path, 'w')                    
                fd.writelines(lines)
                fd.close()

def get_language():
    path = os.path.join(os.environ.get("HOME"), '.i18n')
    if os.access(path, os.R_OK) == 0:
        print _standard_msg 
        fd = open(path, 'w')
        fd.write('LANG="%s"\n' % _default_lang)
        fd.close()
        return _default_lang
    
    fd = open(path, "r")
    lines = fd.readlines()
    fd.close()

    lang = None

    for line in lines:
        if line[:5] == "LANG=":
            lang = line[5:].replace('"', '')
            lang = lang.strip()

    return lang

def print_language():
    code = get_language()

    languages = read_all_languages()
    for lang in languages:
        if lang[2].split('.')[0] == code.split('.')[0]:
            print lang[0].replace(' ', '_') + '/' + lang[1].replace(' ', '_') 
            return
    print (_("Language for code=%s could not be determined.") % code)
    
def set_language(language):
    """Set the system language.
    languages : 
    """
    if language.endswith('utf8'):
        _write_i18n(language)
        return 1
    else:    
        languages = read_all_languages()
        for lang, territory, locale in languages:
            code = lang.replace(' ', '_') + '/' \
                    + territory.replace(' ', '_')
            if code == language:
                _write_i18n(locale)
                return 1
        print (_("Sorry I do not speak \'%s\'.") % language)

# inilialize the docstrings for the language
_initialize()