# -*- coding: utf-8 -*-
from __future__ import absolute_import
import json
import logging
import os
import re

from babelfish import language_converters
from guessit import guessit
from requests import Session

from subliminal import Movie, Episode, ProviderError, __short_version__
from subliminal.exceptions import AuthenticationError, ConfigurationError, DownloadLimitExceeded, ProviderError
from subliminal_patch.subtitle import Subtitle, guess_matches
from subliminal.subtitle import fix_line_ending
from subliminal_patch.providers import Provider
from subzero.language import Language

logger = logging.getLogger(__name__)

language_converters.register('assrt = subliminal_patch.converters.assrt:AssrtConverter')

server_url = 'https://api.assrt.net/v1'
supported_languages = list(language_converters['assrt'].to_assrt.keys())


class AssrtSubtitle(Subtitle):
    """Assrt Sbutitle."""
    provider_name = 'assrt'
    guessit_options = {
        'allowed_languages': [ l[0] for l in supported_languages ],
        'allowed_countries': [ l[1] for l in supported_languages if len(l) > 1 ],
        'enforce_list': True
    }

    def __init__(self, language, subtitle_id, video_name, session, token):
        super(AssrtSubtitle, self).__init__(language)
        self.session = session
        self.token = token
        self.subtitle_id = subtitle_id
        self.video_name = video_name
        self.url = None
        self._detail = None

    def _get_detail(self):
        if self._detail:
            return self._detail
        params = {'token': self.token, 'id': self.id}
        r = self.session.get(server_url + '/sub/detail', params=params, timeout=10)
        r.raise_for_status()

        result = r.json()
        sub = result['sub']['subs'][0]
        files = sub['filelist']

        # first pass: guessit
        for f in files:
            logger.info('File %r', f)
            guess = guessit(f['f'], self.guessit_options)
            logger.info('GuessIt %r', guess)
            langs = set()
            if 'language' in guess:
                langs.update(guess['language'])
            if 'subtitle_language' in guess:
                langs.update(guess['subtitle_language'])
            if self.language in langs:
                self._defail = f
                return f

        # second pass: keyword matching
        codes = language_converters['assrt'].codes
        for f in files:
            langs = set([ Language.fromassrt(k) for k in codes if k in f['f'] ])
            logger.info('%s: %r', f['f'], langs)
            if self.language in langs:
                self._defail = f
                return f

        # fallback: pick up first file if nothing matches
        return files[0]

    @property
    def id(self):
        return self.subtitle_id

    @property
    def download_link(self):
        detail = self._get_detail()
        return detail['url']

    def get_matches(self, video):
        matches = guess_matches(video, guessit(self.video_name))
        return matches


class AssrtProvider(Provider):
    """Assrt Provider."""
    languages = {Language(*l) for l in supported_languages}

    def __init__(self, token=None):
        if not token:
            raise ConfigurationError('Token must be specified')
        self.token = token

    def initialize(self):
        self.session = Session()
        self.session.headers = {'User-Agent': os.environ.get("SZ_USER_AGENT", "Sub-Zero/2")}

    def terminate(self):
        self.session.close()

    def query(self, languages, video):
        # query the server
        keywords = []
        if isinstance(video, Movie):
            if video.title:
                keywords.append(video.title)
            if video.year:
                keywords.append(str(video.year))
        elif isinstance(video, Episode):
            if video.series:
                keywords.append(video.series)
            if video.season and video.episode:
                keywords.append('S%02dE%02d' % (video.season, video.episode))
            elif video.episode:
                keywords.append('E%02d' % video.episode)
        query = ' '.join(keywords)

        params = {'token': self.token, 'q': query, 'is_file': 1}
        logger.debug('Searching subtitles %r', params)
        res = self.session.get(server_url + '/sub/search', params=params, timeout=10)
        res.raise_for_status()
        result = res.json()

        if result['status'] != 0:
            logger.error('status error: %r', r)
            return []

        if not result['sub']['subs']:
            logger.debug('No subtitle found')

        # parse the subtitles
        pattern = re.compile(r'lang(?P<code>\w+)')
        subtitles = []
        for sub in result['sub']['subs']:
            if 'lang' not in sub:
                continue
            for key in sub['lang']['langlist'].keys():
                match = pattern.match(key)
                try:
                    language = Language.fromassrt(match.group('code'))
                    if language in languages:
                        subtitles.append(AssrtSubtitle(language, sub['id'], sub['videoname'], self.session, self.token))
                except:
                    pass

        return subtitles

    def list_subtitles(self, video, languages):
        return self.query(languages, video)

    def download_subtitle(self, subtitle):
        logger.info('Downloading subtitle %r', subtitle)
        r = self.session.get(subtitle.download_link, timeout=10)
        r.raise_for_status()

        subtitle.content = fix_line_ending(r.content)