# coding=utf-8
import ast
import logging
import os
import pickle

from app.config import settings
from app.database import TableEpisodes, TableMovies, database, update, select
from languages.custom_lang import CustomLanguage
from languages.get_languages import language_from_alpha2, language_from_alpha3, alpha3_from_alpha2
from utilities.path_mappings import path_mappings

from knowit.api import know, KnowitException


def _handle_alpha3(detected_language: dict):
    alpha3 = detected_language["language"].alpha3
    custom = CustomLanguage.from_value(alpha3, "official_alpha3")

    if not custom:
        return alpha3

    found = custom.language_found(detected_language["language"])
    if not found:
        found = custom.ffprobe_found(detected_language)

    if found:
        logging.debug("Custom embedded language found: %s", custom.name)
        return custom.alpha3

    return alpha3


def embedded_subs_reader(file, file_size, episode_file_id=None, movie_file_id=None, use_cache=True):
    data = parse_video_metadata(file, file_size, episode_file_id, movie_file_id, use_cache=use_cache)
    und_default_language = alpha3_from_alpha2(settings.general.default_und_embedded_subtitles_lang)

    subtitles_list = []

    if not data:
        return subtitles_list

    cache_provider = None
    if "ffprobe" in data and data["ffprobe"] and "subtitle" in data["ffprobe"]:
        cache_provider = 'ffprobe'
    elif 'mediainfo' in data and data["mediainfo"] and "subtitle" in data["mediainfo"]:
        cache_provider = 'mediainfo'

    if cache_provider:
        for detected_language in data[cache_provider]["subtitle"]:
            # Avoid commentary subtitles
            name = detected_language.get("name", "").lower()
            if "commentary" in name:
                logging.debug(f"Ignoring commentary subtitle: {name}")
                continue

            if "language" not in detected_language:
                language = None
            else:
                language = _handle_alpha3(detected_language)

            if not language and und_default_language:
                logging.debug(f"Undefined language embedded subtitles track treated as {language}")
                language = und_default_language

            if not language:
                continue

            forced = detected_language.get("forced", False)
            hearing_impaired = detected_language.get("hearing_impaired", False)
            codec = detected_language.get("format")  # or None
            subtitles_list.append([language, forced, hearing_impaired, codec])

    return subtitles_list


def embedded_audio_reader(file, file_size, episode_file_id=None, movie_file_id=None, use_cache=True):
    data = parse_video_metadata(file, file_size, episode_file_id, movie_file_id, use_cache=use_cache)

    audio_list = []

    if not data:
        return audio_list

    cache_provider = None
    if "ffprobe" in data and data["ffprobe"] and "audio" in data["ffprobe"]:
        cache_provider = 'ffprobe'
    elif 'mediainfo' in data and data["mediainfo"] and "audio" in data["mediainfo"]:
        cache_provider = 'mediainfo'

    if cache_provider:
        for detected_language in data[cache_provider]["audio"]:
            if "language" not in detected_language:
                audio_list.append(None)
                continue

            if isinstance(detected_language['language'], str):
                logging.error(f"Cannot identify audio track language for this file: {file}. Value detected is "
                              f"{detected_language['language']}.")
                continue

            alpha3 = _handle_alpha3(detected_language)
            language = language_from_alpha3(alpha3)

            if language not in audio_list:
                audio_list.append(language)

    return audio_list


def subtitles_sync_references(subtitles_path, sonarr_episode_id=None, radarr_movie_id=None):
    references_dict = {'audio_tracks': [], 'embedded_subtitles_tracks': [], 'external_subtitles_tracks': []}
    data = None

    if sonarr_episode_id:
        media_data = database.execute(
            select(TableEpisodes.path, TableEpisodes.file_size, TableEpisodes.episode_file_id, TableEpisodes.subtitles)
            .where(TableEpisodes.sonarrEpisodeId == sonarr_episode_id)) \
            .first()

        if not media_data:
            return references_dict

        data = parse_video_metadata(media_data.path, media_data.file_size, media_data.episode_file_id, None,
                                    use_cache=True)
    elif radarr_movie_id:
        media_data = database.execute(
            select(TableMovies.path, TableMovies.file_size, TableMovies.movie_file_id, TableMovies.subtitles)
            .where(TableMovies.radarrId == radarr_movie_id)) \
            .first()

        if not media_data:
            return references_dict

        data = parse_video_metadata(media_data.path, media_data.file_size, None, media_data.movie_file_id,
                                    use_cache=True)

    if not data:
        return references_dict

    cache_provider = None
    if "ffprobe" in data and data["ffprobe"]:
        cache_provider = 'ffprobe'
    elif 'mediainfo' in data and data["mediainfo"]:
        cache_provider = 'mediainfo'

    if cache_provider:
        if 'audio' in data[cache_provider]:
            track_id = 0
            for detected_language in data[cache_provider]["audio"]:
                name = detected_language.get("name", "").replace("(", "").replace(")", "")

                if "language" not in detected_language:
                    language = 'Undefined'
                else:
                    alpha3 = _handle_alpha3(detected_language)
                    language = language_from_alpha3(alpha3)

                references_dict['audio_tracks'].append({'stream': f'a:{track_id}', 'name': name, 'language': language})

                track_id += 1

        if 'subtitle' in data[cache_provider]:
            track_id = 0
            bitmap_subs = ['dvd', 'pgs']
            for detected_language in data[cache_provider]["subtitle"]:
                if any([x in detected_language.get("name", "").lower() for x in bitmap_subs]):
                    # skipping bitmap based subtitles
                    track_id += 1
                    continue

                name = detected_language.get("name", "").replace("(", "").replace(")", "")

                if "language" not in detected_language:
                    language = 'Undefined'
                else:
                    alpha3 = _handle_alpha3(detected_language)
                    language = language_from_alpha3(alpha3)

                forced = detected_language.get("forced", False)
                hearing_impaired = detected_language.get("hearing_impaired", False)

                references_dict['embedded_subtitles_tracks'].append(
                    {'stream': f's:{track_id}', 'name': name, 'language': language,  'forced': forced,
                     'hearing_impaired': hearing_impaired}
                )

                track_id += 1

        try:
            parsed_subtitles = ast.literal_eval(media_data.subtitles)
        except ValueError:
            pass
        else:
            for subtitles in parsed_subtitles:
                reversed_subtitles_path = path_mappings.path_replace_reverse(subtitles_path) if sonarr_episode_id else (
                    path_mappings.path_replace_reverse_movie(subtitles_path))
                if subtitles[1] and subtitles[1] != reversed_subtitles_path:
                    language_dict = languages_from_colon_seperated_string(subtitles[0])
                    references_dict['external_subtitles_tracks'].append({
                        'name': os.path.basename(subtitles[1]),
                        'path': path_mappings.path_replace(subtitles[1]) if sonarr_episode_id else
                        path_mappings.path_replace_reverse_movie(subtitles[1]),
                        'language': language_dict['language'],
                        'forced': language_dict['forced'],
                        'hearing_impaired': language_dict['hi'],
                    })
                else:
                    # excluding subtitles that is going to be synced from the external subtitles list
                    continue

    return references_dict


def parse_video_metadata(file, file_size, episode_file_id=None, movie_file_id=None, use_cache=True):
    # Define default data keys value
    data = {
        "ffprobe": {},
        "mediainfo": {},
        "file_id": episode_file_id or movie_file_id,
        "file_size": file_size,
    }

    embedded_subs_parser = settings.general.embedded_subtitles_parser

    if use_cache:
        # Get the actual cache value form database
        if episode_file_id:
            cache_key = database.execute(
                select(TableEpisodes.ffprobe_cache)
                .where(TableEpisodes.path == path_mappings.path_replace_reverse(file))) \
                .first()
        elif movie_file_id:
            cache_key = database.execute(
                select(TableMovies.ffprobe_cache)
                .where(TableMovies.path == path_mappings.path_replace_reverse_movie(file))) \
                .first()
        else:
            cache_key = None

        # check if we have a value for that cache key
        try:
            # Unpickle ffprobe cache
            cached_value = pickle.loads(cache_key.ffprobe_cache)
        except Exception:
            pass
        else:
            # Check if file size and file id matches and if so, we return the cached value if available for the
            # desired parser
            if cached_value['file_size'] == file_size and cached_value['file_id'] in [episode_file_id, movie_file_id]:
                if embedded_subs_parser in cached_value and cached_value[embedded_subs_parser]:
                    return cached_value
                else:
                    # no valid cache
                    pass
            else:
                # cache must be renewed
                pass

    # if not, we retrieve the metadata from the file
    from utilities.binaries import get_binary

    ffprobe_path = mediainfo_path = None
    if embedded_subs_parser == 'ffprobe':
        ffprobe_path = get_binary("ffprobe")
    elif embedded_subs_parser == 'mediainfo':
        mediainfo_path = get_binary("mediainfo")

    # see if file exists (perhaps offline)
    if not os.path.exists(file):
        logging.error(f'Video file "{file}" cannot be found for analysis')
        return None
    
    # if we have ffprobe available
    if ffprobe_path:
        try:
            data["ffprobe"] = know(video_path=file, context={"provider": "ffmpeg", "ffmpeg": ffprobe_path})
        except KnowitException as e:
            logging.error(f"BAZARR ffprobe cannot analyze this video file {file}. Could it be corrupted? {e}")
            return None
    # or if we have mediainfo available
    elif mediainfo_path:
        try:
            # disabling mediainfo path temporarily until issue with knowit is fixed.
            # data["mediainfo"] = know(video_path=file, context={"provider": "mediainfo", "mediainfo": mediainfo_path})
            data["mediainfo"] = know(video_path=file, context={"provider": "mediainfo"})
        except KnowitException as e:
            logging.error(f"BAZARR mediainfo cannot analyze this video file {file}. Could it be corrupted? {e}")
            return None
    # else, we warn user of missing binary
    else:
        logging.error("BAZARR require ffmpeg/ffprobe or mediainfo, please install it and make sure to choose it in "
                      "Settings-->Subtitles.")
        return

    # we write to db the result and return the newly cached ffprobe dict
    if episode_file_id:
        database.execute(
            update(TableEpisodes)
            .values(ffprobe_cache=pickle.dumps(data, pickle.HIGHEST_PROTOCOL))
            .where(TableEpisodes.path == path_mappings.path_replace_reverse(file)))
    elif movie_file_id:
        database.execute(
            update(TableMovies)
            .values(ffprobe_cache=pickle.dumps(data, pickle.HIGHEST_PROTOCOL))
            .where(TableMovies.path == path_mappings.path_replace_reverse_movie(file)))
    return data


def languages_from_colon_seperated_string(lang):
    splitted_language = lang.split(':')
    language = language_from_alpha2(splitted_language[0])
    forced = hi = False
    if len(splitted_language) > 1:
        if splitted_language[1] == 'forced':
            forced = True
        elif splitted_language[1] == 'hi':
            hi = True
    return {'language': language, 'forced': forced, 'hi': hi}
