from typing import cast, Optional

from googleapiclient.discovery import build as gapi_discovery_build
from googleapiclient.errors import Error as GoogleApiError

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


class YoutubePlugin(Plugin):

    REQUIRED_CONFIGS = ["commands", "api_key"]
    VIDEO_URL_FMT = "https://www.youtube.com/watch?v={}"
    CHANNEL_URL_FMT = "https://www.youtube.com/channel/{}"
    PLAYLIST_URL_FMT = "https://www.youtube.com/playlist?list={}"

    def __init__(self, bot):
        super().__init__(bot)
        self._youtube = None
        self._playlist_of_the_day_plugin = None

    @property
    def youtube(self):
        if self._youtube is None:
            self._youtube = gapi_discovery_build(
                "youtube",
                "v3",
                developerKey=self.config["api_key"],
            )
        return self._youtube

    @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.config["api_key"]:
            self.bot.log_w("Youtube API key unavailable.")
            self.is_ready = False

    def on_pubmsg(self, event):
        if self.should_handle_command(event.arguments[0]):
            self.handle_commands(event.target)
            return True
        return False

    def handle_commands(self, target):
        if self.command.ident != self.config["commands"][0]:
            return
        try:
            search_response = (
                self.youtube.search()
                .list(
                    q=self.command.content,
                    part="id,snippet",
                    maxResults=1,
                )
                .execute()
            )
        except GoogleApiError:
            self.signal_failure(target)
            return

        link = ""
        icon = ""
        title = ""
        for result in search_response.get("items", []):
            kind = result["id"]["kind"]
            if kind == "youtube#video":
                video_id = result["id"]["videoId"]
                link = self.VIDEO_URL_FMT.format(video_id)
                icon = "📼"
            elif kind == "youtube#channel":
                channel_id = result["id"]["channelId"]
                link = self.CHANNEL_URL_FMT.format(channel_id)
                icon = "📺"
            elif kind == "youtube#playlist":
                playlist_id = result["id"]["playlistId"]
                link = self.PLAYLIST_URL_FMT.format(playlist_id)
                icon = "➕"
            if link:
                title = result["snippet"]["title"]
                break
        else:
            self.signal_failure(target)
            return
        self.bot.say(target, f"{icon} {link} {title}")

        if self.playlist_of_the_day_plugin:
            self.playlist_of_the_day_plugin.add_line(f"{link} {title}")