# -*- coding:utf-8 -*-
#
# Copyright (C) 2019, Maximilian Köhl <linuxmaxi@googlemail.com>
# Copyright (C) 2019, Carlos Jenkins <carlos@jenkins.co.cr>
#
# 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 3 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/>.

"""
Query the ISO 639/3166 database about a country or a language. The locales
database contains ISO 639 language definitions and ISO 3166 country definitions.
This package provides translation for country and language names if the
iso-code messages are installed on your system.
"""

import gettext
import logging
import os
import sqlite3
import sys

# public objects
__all__ = ['Country', 'Language', 'LanguageNotFound',
           'CountryNotFound', 'code_to_name']

# translation
_translator_language = gettext.translation('iso_639', fallback=True).gettext
_translator_country = gettext.translation('iso_3166', fallback=True).gettext

# Decides where the database is located. If an application provides an
# os.path.get_module_path monkey patch to determine the path where the module
# is located it uses this. If not it searches in the directory of this source
# code file.
__path__ = None
if hasattr(os.path, 'get_module_path'):
    __path__ = os.path.get_module_path(__file__)
    if not os.path.isfile(os.path.join(__path__, 'locales.db')):
        __path__ = None
if __path__ is None:
    frozen = getattr(sys, 'frozen', None)
    if frozen in ('dll', 'console_exe', 'windows_exe'):
        __path__ = os.path.abspath(os.path.dirname(sys.executable))
    elif frozen == 'macosx_app':
        __path__ = os.path.abspath(os.environ['RESOURCEPATH'])
    elif frozen is True:
        # Handle executables produced by PyInstaller.
        __path__ = sys._MEIPASS
    else:
        __path__ = os.path.abspath(os.path.realpath(os.path.dirname(__file__)))
    

# loading the database
_database = sqlite3.connect(os.path.join(__path__, 'locales.db'))

logger = logging.getLogger(__name__)

class LanguageNotFound(Exception):
    """
    The specified language wasn't found in the database.
    """
    
class CountryNotFound(Exception):
    """
    The specified country wasn't found in the database.
    """

class Country(object):
    def __init__(self, rowid):
        country = _database.execute('SELECT * FROM countries WHERE rowid == ?',
                                    (rowid,)).fetchone()
        self.name = country[0]
        self.official_name = country[1]
        self.alpha_2 = country[2]
        self.alpha_3 = country[3]
        self.numeric = country[4]
        self.translation = _translator_country(self.name)
        
    @classmethod
    def get_country(cls, code, codec):
        country = _database.execute(
            'SELECT rowid FROM countries WHERE %s == ?' % (codec),
            (code,)).fetchone()
        if country:
            return cls(country[0])
        raise CountryNotFound('code: %s, codec: %s' % (code, codec))
    
    @classmethod
    def by_alpha_2(cls, code):
        return Country.get_country(code, 'alpha_2')
    
    @classmethod
    def by_alpha_3(cls, code):
        return Country.get_country(code, 'alpha_3')
    
    @classmethod
    def by_numeric(cls, code):
        return Country.get_country(code, 'numeric')
   
class Language(object):
    def __init__(self, rowid):
        language = _database.execute('SELECT * FROM languages WHERE rowid == ?',
                                     (rowid,)).fetchone()
        self.name = language[0]
        self.iso_639_2B = language[1]
        self.iso_639_2T = language[2]
        self.iso_639_1 = language[3]
        self.translation = _translator_language(self.name)
        
    @classmethod
    def get_language(cls, code, codec):
        language = _database.execute(
            'SELECT rowid FROM languages WHERE %s == ?' % (codec),
            (code,)).fetchone()
        if language:
            return cls(language[0])
        raise LanguageNotFound('code: %s, codec: %s' % (code, codec))
        
    @classmethod
    def by_iso_639_2B(cls, code):
        return Language.get_language(code, 'iso_639_2B')
    
    @classmethod
    def by_iso_639_2T(cls, code):
        return Language.get_language(code, 'iso_639_2T')
    
    @classmethod
    def by_iso_639_1(cls, code):
        return Language.get_language(code, 'iso_639_1')


def code_to_name(code, separator='_'):
    """  
    Get the human readable and translated name of a language based on it's code.
    
    :param code: the code of the language (e.g. de_DE, en_US) 
    :param target: separator used to separate language from country
    :rtype: human readable and translated language name
    """
    logger.debug('requesting name for code "{}"'.format(code))
    code = code.split(separator)
    if len(code) > 1:
        lang = Language.by_iso_639_1(code[0]).translation
        country = Country.by_alpha_2(code[1]).translation
        return '{} ({})'.format(lang, country)
    else:
        return Language.by_iso_639_1(code[0]).translation