"""
This module implements the core developer interface for pytube.

The problem domain of the :class:`YouTube <YouTube> class focuses almost
exclusively on the developer interface. Pytube offloads the heavy lifting to
smaller peripheral modules and functions.

...
"""
import json
import logging
from typing import Any, Callable, Dict, List, Optional
from urllib.parse import parse_qsl

import pytube
import pytube.exceptions as exceptions
from pytube import extract, request
from pytube import Stream, StreamQuery
from pytube.helpers import install_proxy
from pytube.innertube import InnerTube
from pytube.metadata import YouTubeMetadata
from pytube.monostate import Monostate

logger = logging.getLogger(__name__)


class YouTube:
    """Core developer interface for pytube."""

    def __init__(
        self,
        url: str,
        on_progress_callback: Optional[Callable[[Any, bytes, int], None]] = None,
        on_complete_callback: Optional[Callable[[Any, Optional[str]], None]] = None,
        proxies: Dict[str, str] = None,
    ):
        """Construct a :class:`YouTube <YouTube>`.

        :param str url:
            A valid YouTube watch URL.
        :param func on_progress_callback:
            (Optional) User defined callback function for stream download
            progress events.
        :param func on_complete_callback:
            (Optional) User defined callback function for stream download
            complete events.

        """
        self._js: Optional[str] = None  # js fetched by js_url
        self._js_url: Optional[str] = None  # the url to the js, parsed from watch html

        # note: vid_info may eventually be removed. It sounds like it once had
        # additional formats, but that doesn't appear to still be the case.

        # the url to vid info, parsed from watch html
        self._vid_info_url: Optional[str] = None
        self._vid_info_raw: Optional[str] = None  # content fetched by vid_info_url
        self._vid_info: Optional[Dict] = None  # parsed content of vid_info_raw

        self._watch_html: Optional[str] = None  # the html of /watch?v=<video_id>
        self._embed_html: Optional[str] = None
        self._player_config_args: Optional[Dict] = None  # inline js in the html containing
        self._player_response: Optional[Dict] = None
        # streams
        self._age_restricted: Optional[bool] = None

        self._fmt_streams: Optional[List[Stream]] = None

        self._initial_data = None
        self._metadata: Optional[YouTubeMetadata] = None

        # video_id part of /watch?v=<video_id>
        self.video_id = extract.video_id(url)

        self.watch_url = f"https://youtube.com/watch?v={self.video_id}"
        self.embed_url = f"https://www.youtube.com/embed/{self.video_id}"

        # Shared between all instances of `Stream` (Borg pattern).
        self.stream_monostate = Monostate(
            on_progress=on_progress_callback, on_complete=on_complete_callback
        )

        if proxies:
            install_proxy(proxies)

        self._author = None
        self._title = None
        self._publish_date = None

    def __repr__(self):
        return f'<pytube.__main__.YouTube object: videoId={self.video_id}>'

    @property
    def watch_html(self):
        if self._watch_html:
            return self._watch_html
        self._watch_html = request.get(url=self.watch_url)
        return self._watch_html

    @property
    def embed_html(self):
        if self._embed_html:
            return self._embed_html
        self._embed_html = request.get(url=self.embed_url)
        return self._embed_html

    @property
    def vid_info_raw(self):
        if self._vid_info_raw:
            return self._vid_info_raw
        innertube = InnerTube()
        vid_info_raw = innertube.player(self.video_id)
        # Rename dict key "responseContext" to "player_response"
        # for backward compatibility.
        vid_info_raw["player_response"] = vid_info_raw.pop("responseContext")
        self._vid_info_raw = vid_info_raw
        return self._vid_info_raw

    @property
    def age_restricted(self):
        if self._age_restricted:
            return self._age_restricted
        self._age_restricted = extract.is_age_restricted(self.watch_html)
        return self._age_restricted

    @property
    def vid_info_url(self):
        if self._vid_info_url:
            return self._vid_info_url

        if self.age_restricted:
            self._vid_info_url = extract.video_info_url_age_restricted(
                self.video_id, self.watch_url
            )
        else:
            self._vid_info_url = extract.video_info_url(
                video_id=self.video_id, watch_url=self.watch_url
            )
        return self._vid_info_url

    @property
    def js_url(self):
        if self._js_url:
            return self._js_url

        if self.age_restricted:
            self._js_url = extract.js_url(self.embed_html)
        else:
            self._js_url = extract.js_url(self.watch_html)

        return self._js_url

    @property
    def js(self):
        if self._js:
            return self._js

        # If the js_url doesn't match the cached url, fetch the new js and update
        #  the cache; otherwise, load the cache.
        if pytube.__js_url__ != self.js_url:
            self._js = request.get(self.js_url)
            pytube.__js__ = self._js
            pytube.__js_url__ = self.js_url
        else:
            self._js = pytube.__js__

        return self._js

    @property
    def player_response(self):
        """The player response contains subtitle information and video details."""
        if self._player_response:
            return self._player_response

        if isinstance(self.player_config_args["player_response"], str):
            self._player_response = json.loads(
                self.player_config_args["player_response"]
            )
        else:
            self._player_response = self.player_config_args["player_response"]
        return self._player_response

    @property
    def initial_data(self):
        if self._initial_data:
            return self._initial_data
        self._initial_data = extract.initial_data(self.watch_html)
        return self._initial_data

    @property
    def player_config_args(self):
        if self._player_config_args:
            return self._player_config_args

        self._player_config_args = self.vid_info
        # On pre-signed videos, we need to use get_ytplayer_config to fix
        #  the player_response item
        if 'streamingData' not in self.player_config_args['player_response']:
            config_response = extract.get_ytplayer_config(self.watch_html)
            if 'args' in config_response:
                self.player_config_args['player_response'] = config_response['args']['player_response']  # noqa: E501
            else:
                self.player_config_args['player_response'] = config_response

        return self._player_config_args

    @property
    def fmt_streams(self):
        """Returns a list of streams if they have been initialized.

        If the streams have not been initialized, finds all relevant
        streams and initializes them.
        """
        self.check_availability()
        if self._fmt_streams:
            return self._fmt_streams

        self._fmt_streams = []
        # https://github.com/pytube/pytube/issues/165
        stream_maps = ["url_encoded_fmt_stream_map"]
        if "adaptive_fmts" in self.player_config_args:
            stream_maps.append("adaptive_fmts")

        # unscramble the progressive and adaptive stream manifests.
        for fmt in stream_maps:
            if not self.age_restricted and fmt in self.vid_info:
                extract.apply_descrambler(self.vid_info, fmt)
            extract.apply_descrambler(self.player_config_args, fmt)

            # If the cached js doesn't work, try fetching a new js file
            # https://github.com/pytube/pytube/issues/1054
            try:
                extract.apply_signature(self.player_config_args, fmt, self.js)
            except exceptions.ExtractError:
                # To force an update to the js file, we clear the cache and retry
                self._js = None
                self._js_url = None
                pytube.__js__ = None
                pytube.__js_url__ = None
                extract.apply_signature(self.player_config_args, fmt, self.js)

            # build instances of :class:`Stream <Stream>`
            # Initialize stream objects
            stream_manifest = self.player_config_args[fmt]
            for stream in stream_manifest:
                video = Stream(
                    stream=stream,
                    player_config_args=self.player_config_args,
                    monostate=self.stream_monostate,
                )
                self._fmt_streams.append(video)

        self.stream_monostate.title = self.title
        self.stream_monostate.duration = self.length

        return self._fmt_streams

    def check_availability(self):
        """Check whether the video is available.

        Raises different exceptions based on why the video is unavailable,
        otherwise does nothing.
        """
        status, messages = extract.playability_status(self.watch_html)

        for reason in messages:
            if status == 'UNPLAYABLE':
                if reason == (
                    'Join this channel to get access to members-only content '
                    'like this video, and other exclusive perks.'
                ):
                    raise exceptions.MembersOnly(video_id=self.video_id)
                elif reason == 'This live stream recording is not available.':
                    raise exceptions.RecordingUnavailable(video_id=self.video_id)
                else:
                    if reason == 'Video unavailable':
                        if extract.is_region_blocked(self.watch_html):
                            raise exceptions.VideoRegionBlocked(video_id=self.video_id)
                    raise exceptions.VideoUnavailable(video_id=self.video_id)
            elif status == 'LOGIN_REQUIRED':
                if reason == (
                    'This is a private video. '
                    'Please sign in to verify that you may see it.'
                ):
                    raise exceptions.VideoPrivate(video_id=self.video_id)
            elif status == 'ERROR':
                if reason == 'Video unavailable':
                    raise exceptions.VideoUnavailable(video_id=self.video_id)
            elif status == 'LIVE_STREAM':
                raise exceptions.LiveStreamError(video_id=self.video_id)

    @property
    def vid_info(self):
        """Parse the raw vid info and return the parsed result.

        :rtype: Dict[Any, Any]
        """
        return self.vid_info_raw

    @property
    def caption_tracks(self) -> List[pytube.Caption]:
        """Get a list of :class:`Caption <Caption>`.

        :rtype: List[Caption]
        """
        raw_tracks = (
            self.player_response.get("captions", {})
            .get("playerCaptionsTracklistRenderer", {})
            .get("captionTracks", [])
        )
        return [pytube.Caption(track) for track in raw_tracks]

    @property
    def captions(self) -> pytube.CaptionQuery:
        """Interface to query caption tracks.

        :rtype: :class:`CaptionQuery <CaptionQuery>`.
        """
        return pytube.CaptionQuery(self.caption_tracks)

    @property
    def streams(self) -> StreamQuery:
        """Interface to query both adaptive (DASH) and progressive streams.

        :rtype: :class:`StreamQuery <StreamQuery>`.
        """
        self.check_availability()
        return StreamQuery(self.fmt_streams)

    @property
    def thumbnail_url(self) -> str:
        """Get the thumbnail url image.

        :rtype: str
        """
        thumbnail_details = (
            self.player_response.get("videoDetails", {})
            .get("thumbnail", {})
            .get("thumbnails")
        )
        if thumbnail_details:
            thumbnail_details = thumbnail_details[-1]  # last item has max size
            return thumbnail_details["url"]

        return f"https://img.youtube.com/vi/{self.video_id}/maxresdefault.jpg"

    @property
    def publish_date(self):
        """Get the publish date.

        :rtype: datetime
        """
        if self._publish_date:
            return self._publish_date
        self._publish_date = extract.publish_date(self.watch_html)
        return self._publish_date

    @publish_date.setter
    def publish_date(self, value):
        """Sets the publish date."""
        self._publish_date = value

    @property
    def title(self) -> str:
        """Get the video title.

        :rtype: str
        """
        if self._title:
            return self._title

        try:
            self._title = self.player_response['videoDetails']['title']
        except KeyError:
            # Check_availability will raise the correct exception in most cases
            #  if it doesn't, ask for a report.
            self.check_availability()
            raise exceptions.PytubeError(
                (
                    f'Exception while accessing title of {self.watch_url}. '
                    'Please file a bug report at https://github.com/pytube/pytube'
                )
            )

        return self._title

    @title.setter
    def title(self, value):
        """Sets the title value."""
        self._title = value

    @property
    def description(self) -> str:
        """Get the video description.

        :rtype: str
        """
        return self.player_response.get("videoDetails", {}).get("shortDescription")

    @property
    def rating(self) -> float:
        """Get the video average rating.

        :rtype: float

        """
        return self.player_response.get("videoDetails", {}).get("averageRating")

    @property
    def length(self) -> int:
        """Get the video length in seconds.

        :rtype: int
        """
        return int(
            self.player_config_args.get("length_seconds")
            or (
                self.player_response.get("videoDetails", {}).get(
                    "lengthSeconds"
                )
            )
        )

    @property
    def views(self) -> int:
        """Get the number of the times the video has been viewed.

        :rtype: int
        """
        return int(
            self.player_response.get("videoDetails", {}).get("viewCount")
        )

    @property
    def author(self) -> str:
        """Get the video author.
        :rtype: str
        """
        if self._author:
            return self._author
        self._author = self.player_response.get("videoDetails", {}).get(
            "author", "unknown"
        )
        return self._author

    @author.setter
    def author(self, value):
        """Set the video author."""
        self._author = value

    @property
    def keywords(self) -> List[str]:
        """Get the video keywords.

        :rtype: List[str]
        """
        return self.player_response.get('videoDetails', {}).get('keywords', [])

    @property
    def channel_id(self) -> str:
        """Get the video poster's channel id.

        :rtype: str
        """
        return self.player_response.get('videoDetails', {}).get('channelId', None)

    @property
    def channel_url(self) -> str:
        """Construct the channel url for the video's poster from the channel id.

        :rtype: str
        """
        return f'https://www.youtube.com/channel/{self.channel_id}'

    @property
    def metadata(self) -> Optional[YouTubeMetadata]:
        """Get the metadata for the video.

        :rtype: YouTubeMetadata
        """
        if self._metadata:
            return self._metadata
        else:
            self._metadata = extract.metadata(self.initial_data)
            return self._metadata

    def register_on_progress_callback(self, func: Callable[[Any, bytes, int], None]):
        """Register a download progress callback function post initialization.

        :param callable func:
            A callback function that takes ``stream``, ``chunk``,
             and ``bytes_remaining`` as parameters.

        :rtype: None

        """
        self.stream_monostate.on_progress = func

    def register_on_complete_callback(self, func: Callable[[Any, Optional[str]], None]):
        """Register a download complete callback function post initialization.

        :param callable func:
            A callback function that takes ``stream`` and  ``file_path``.

        :rtype: None

        """
        self.stream_monostate.on_complete = func
