import re
from typing import cast, Optional

try:
    from googleapiclient.errors import Error as GoogleApiError  # type: ignore

    DEPENDENCIES_FOUND = True
except ImportError:
    DEPENDENCIES_FOUND = False

from edmond.plugin import Plugin
from edmond.plugins.playlist_of_the_day import PlaylistOfTheDayPlugin
from edmond.plugins.youtube import YoutubePlugin


class YoutubeParserPlugin(Plugin):

    VIDEO_URL_RE = re.compile(
        r"https?:\/\/(?:[^/]+/watch\?(?:.*&)?v=(?P<code1>[^&\s]+)"
        r"|youtu\.be/(?P<code2>[^&\s]+))"
    )

    def __init__(self, bot):
        super().__init__(bot)
        self.priority = -3
        self._youtube_plugin: Optional[YoutubePlugin] = None
        self._playlist_of_the_day_plugin: Optional[
            PlaylistOfTheDayPlugin
        ] = None

    @property
    def youtube_plugin(self) -> Optional[YoutubePlugin]:
        if self._youtube_plugin is None:
            self._youtube_plugin = cast(
                YoutubePlugin,
                self.bot.get_plugin("youtube"),
            )
        return self._youtube_plugin

    @property
    def playlist_of_the_day_plugin(self) -> Optional[PlaylistOfTheDayPlugin]:
        if self._playlist_of_the_day_plugin is None:
            self._playlist_of_the_day_plugin = cast(
                PlaylistOfTheDayPlugin,
                self.bot.get_plugin("playlistoftheday"),
            )
        return self._playlist_of_the_day_plugin

    def on_welcome(self, _):
        if not (self.youtube_plugin and self.youtube_plugin.is_ready):
            self.bot.log_w("Youtube plugin is not available.")
            self.is_ready = False

    def on_pubmsg(self, event):
        if not self.respects_handling_conditions():
            return False
        words = event.arguments[0].split()
        for word in words:
            matched = self.VIDEO_URL_RE.match(word)
            if matched:
                title = self.get_video_title(matched)
                if title:
                    self.bot.say(event.target, title)
                    self.add_to_playlist(word, title)
                    return True
                else:
                    self.signal_failure(event.target)
        return False

    def get_video_title(self, matched) -> Optional[str]:
        if self.youtube_plugin is None:
            return None
        groupdict = matched.groupdict()
        code = groupdict.get("code1") or groupdict.get("code2")
        if not code:
            return None
        try:
            search_response = (
                self.youtube_plugin.youtube.videos()
                .list(id=code, part="snippet")
                .execute()
            )
        except GoogleApiError:
            return None
        title = ""
        for result in search_response.get("items", []):
            if result["kind"] == "youtube#video":
                title = result["snippet"]["title"]
                break
        else:
            return None
        return title

    def add_to_playlist(self, url: str, title: str):
        if self.playlist_of_the_day_plugin is None:
            return
        self.playlist_of_the_day_plugin.add_line(f"{url} {title}")