# -*- coding: utf-8 -*-
#
# Copyright © 2012 - 2019 Michal Čihař <michal@cihar.com>
#
# This file is part of Weblate <https://weblate.org/>
#
# 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 <https://www.gnu.org/licenses/>.
#

from __future__ import unicode_literals

import json

from django.conf import settings

from weblate.machinery.base import (
    MachineTranslation,
    MachineTranslationError,
    MissingConfiguration,
)

GOOGLE_API_ROOT = 'https://translation.googleapis.com/language/translate/v2/'


class GoogleTranslation(MachineTranslation):
    """Google Translate API v2 machine translation support."""

    name = 'Google Translate'
    max_score = 90

    # Map old codes used by Google to new ones used by Weblate
    language_map = {'he': 'iw', 'jv': 'jw', 'nb': 'no'}

    def __init__(self):
        """Check configuration."""
        super(GoogleTranslation, self).__init__()
        if settings.MT_GOOGLE_KEY is None:
            raise MissingConfiguration('Google Translate requires API key')

    def convert_language(self, language):
        """Convert language to service specific code."""
        return super(GoogleTranslation, self).convert_language(
            language.replace('_', '-').split('@')[0]
        )

    def download_languages(self):
        """List of supported languages."""
        response = self.json_req(
            GOOGLE_API_ROOT + 'languages', key=settings.MT_GOOGLE_KEY
        )

        if 'error' in response:
            raise MachineTranslationError(response['error']['message'])

        return [d['language'] for d in response['data']['languages']]

    def download_translations(self, source, language, text, unit, user):
        """Download list of possible translations from a service."""
        response = self.json_req(
            GOOGLE_API_ROOT,
            key=settings.MT_GOOGLE_KEY,
            q=text,
            source=source,
            target=language,
            format='text',
        )

        if 'error' in response:
            raise MachineTranslationError(response['error']['message'])

        translation = response['data']['translations'][0]['translatedText']

        return [
            {
                'text': translation,
                'quality': self.max_score,
                'service': self.name,
                'source': text,
            }
        ]

    def get_error_message(self, exc):
        if hasattr(exc, 'read'):
            content = exc.read()
            try:
                data = json.loads(content)
                return data['error']['message']
            except Exception:
                pass

        return super(GoogleTranslation, self).get_error_message(exc)
