#!/usr/bin/env python2
# -*- coding: utf-8 -*-

"""Language localization for PsychoPy.

Sets the locale value as a wx languageID (int) and initializes gettext
translation _translate():
    from psychopy.app import localization
"""

# Part of the PsychoPy library
# Copyright (C) 2018 Jonathan Peirce
# Distributed under the terms of the GNU General Public License (GPL).

# Author: Jeremy Gray, July 2014


import gettext
import os
import glob
import io
from psychopy import logging, prefs, constants
import wx
import locale as locale_pkg


def setLocaleWX():
    """Sets up the locale for the wx application. Only call this after the app
    has been created and initialised (it is called by PsychoPyApp.OnInit())

    :return: wx.Locale object
    """
    # set locale for wx app (before splash screen):
    encod = locale_pkg.getpreferredencoding(do_setlocale=False)
    if locale.IsAvailable(languageID):
        wxlocale = wx.Locale(languageID)
    else:
        wxlocale = wx.Locale(wx.LANGUAGE_DEFAULT)
    # Check language layout, and reset to default if RTL
    if wxlocale.GetCanonicalName()[:2] in ['ar', 'dv', 'fa', 'ha', 'he', 'ps', 'ur', 'yi']:
        wxlocale = wx.Locale(wx.LANGUAGE_DEFAULT)
    # wx.Locale on Py2.7/wx3.0 seems to delete the preferred encoding (utf-8)
    # Check if that happened and reinstate if needed.
    if locale_pkg.getpreferredencoding(do_setlocale=False) == '':
        locale_pkg.setlocale(locale_pkg.LC_ALL,
                             "{}.{}".format(codeFromWxId[languageID], encod))
    return wxlocale

# Get a dict of locale aliases from wx.Locale() -- same cross-platform
# (Win 7, Mac 10.9)
# this DOESN'T need the app to be instantiated
locale = wx.Locale()
aliases = {u'English (U.S.)': 'en_US'}
# set defaults because locale.GetLanguageInfo(0) can return None on some
# systems:
wxIdFromCode = {'en_US': wx.LANGUAGE_DEFAULT}  # int: 0 default, 2-229
# used in directory names e.g. ja_JP; never JPN ala Windows
codeFromWxId = {wx.LANGUAGE_DEFAULT: 'en_US'}
for i in range(230):
    info = locale.GetLanguageInfo(i)
    if info:
        # mix of forms: ja or ja_JP
        aliases[info.Description] = info.CanonicalName
        wxIdFromCode[info.CanonicalName] = i
        codeFromWxId[i] = info.CanonicalName

# read all known mappings cross-platform from a file:
# get windows 3-letter code (=val) from canonical form (=key); use only
# for setting locale (non-wx)
winmap = {'en_US': 'ENU'}
# descriptive name, if available; 5-letter code if not
locname = {'en_US': u'English (U.S.)'}
reverseMap = {u'English (U.S.)': 'en_US'}
mappings = os.path.join(os.path.dirname(__file__), 'mappings.txt')

with io.open(mappings, 'r', encoding='utf-8-sig') as f:
    for line in f.readlines():
        try:
            # canonical, windows, name-with-spaces
            can, win, name = line.strip().split(' ', 2)
        except ValueError:
            can, win = line.strip().split(' ', 1)
            name = can
        winmap[can] = win
        locname[can] = name
        reverseMap[name] = can

# what are the available translations? available languages on the OS?
expr = os.path.join(os.path.dirname(__file__), '..', 'app', 'locale', '*')
available = sorted(map(os.path.basename, glob.glob(expr)))
sysAvail = [str(l) for l in codeFromWxId.values()  # installed language packs
            if l and locale.IsAvailable(wxIdFromCode[l])]


def getID(lang=None):
    """Get wx ID of language to use for translations:
        `lang`, pref, or system default.

    `lang` is a 5 char `language_REGION`, eg ja_JP
    """
    if lang:
        val = lang
    else:
        try:
            val = prefs.app['locale']
        except KeyError:
            val = locale.GetLocale()  # wx.Locale, no encoding
        if not val:
            val = codeFromWxId[wx.LANGUAGE_DEFAULT]
    try:
        # todo: try to set wx.Locale here to language
        language = wxIdFromCode[val]
    except KeyError:
        logging.error('locale %s not known to wx.Locale, using default' % val)
        language = wx.LANGUAGE_DEFAULT

    return language, val

languageID, lang = getID()
# use lang like this:
# import locale  -- the non-wx version of locale
#
# if sys.platform.startswith('win'):
#        v = winmap[val]
# else: v=val
# locale.setlocale(locale.LC_ALL, (v, 'UTF-8'))

# ideally rewrite the following using wxlocale only:
path = os.path.join(os.path.dirname(__file__), '..', 'app',
                    'locale', lang, 'LC_MESSAGE') + os.sep
mofile = os.path.join(path, 'messages.mo')
try:
    logging.debug("Opening message catalog %s for locale %s" % (mofile, lang))
    trans = gettext.GNUTranslations(open(mofile, "rb"))
except IOError:
    logging.debug("Locale for '%s' not found. Using default." % lang)
    trans = gettext.NullTranslations()

if constants.PY3:
    trans.install()
else:
    trans.install(unicode=True)

# PsychoPy app uses a nonstandard name _translate (instead of _)
# A dependency overwrites _ somewhere, clobbering use of _ as global:
# __builtins__['_translate'] = _
# del(__builtins__['_'])  # idea: force psychopy code to use _translate

# Feb 2016: require modules to explicitly import _translate from localization:
_translate = _  # _ is created by gettext, in builtins namespace
del(__builtins__['_'])


# some common ones that will be used by many components etc
_localized = {
    # for BaseComponent:
    'name': _translate('Name'),  # fieldName: display label
    'startType': _translate('start type'),
    'stopType': _translate('stop type'),
    'startVal': _translate('Start'),
    'stopVal': _translate('Stop'),
    'startEstim': _translate('Expected start (s)'),
    'durationEstim': _translate('Expected duration (s)'),

    # for BaseVisualComponent:
    'units': _translate('Units'),
    'color': _translate('Color'),
    'colorSpace': _translate('Color space'),
    'opacity': _translate('Opacity'),
    'pos': _translate('Position [x,y]'),
    'ori': _translate('Orientation'),
    'size': _translate('Size [w,h]'),

    # for loops
    'Name': _translate('Name'),
    'nReps': _translate('nReps'),
    'conditions': _translate('Conditions'),  # not the same
    'endPoints': _translate('endPoints'),
    'Selected rows': _translate('Selected rows'),
    'loopType': _translate('loopType'),
    'random seed': _translate('random seed'),
    'Is trials': _translate('Is trials'),
    'min value': _translate('min value'),
    'N reversals': _translate('N reversals'),
    'start value': _translate('start value'),
    'N up': _translate('N up'),
    'max value': _translate('max value'),
    'N down': _translate('N down'),
    'step type': _translate('step type'),
    'step sizes': _translate('step sizes'),
    'stairType': _translate('stairType'),
    'switchMethod': _translate('switchMethod')
}


# __builtins__['_'] = wx.GetTranslation
# this seems to have no effect, needs more investigation:
# path = os.path.join(os.path.dirname(__file__), '..', 'locale',
#                     lang, 'LC_MESSAGE') + os.sep
# wxlocale.AddCatalogLookupPathPrefix(path)
