import discord

import embed_util
import manga_api

class Manager:
    def __init__(self):
        self.manga = {}
        self.chapters = {}

    def add_user_to_manga(self, user: discord.User, manga: manga_api.Manga) -> None:
        self.manga[manga.id].append(user.id)

    def remove_user_from_manga(self, user: discord.User, manga: manga_api.Manga) -> None:
        self.manga[manga.id].remove(user.id)

    async def update(self):
        for manga_id in self.manga.keys():
            manga = manga_api.Manga(manga_id)
            new_chap = self.check_for_new_chapter(manga)
            if new_chap is not None:
                users = self.manga[manga_id]
                for user in users:
                    await self.send_message_to_user(user, manga, new_chap)

    def check_for_new_chapter(self, manga: manga_api.Manga) -> manga_api.Chapter | None:
        latest_chap = manga.get_latest_chap()
        if latest_chap not in self.chapters.keys():
            self.chapters[manga.id] = latest_chap
            return latest_chap
        if float(latest_chap.get_chapter_num()) > self.chapters[manga.id]:
            self.chapters[manga.id] = latest_chap
            return latest_chap
        else:
            return None

    async def send_message_to_user(self, user: discord.User, manga: manga_api.Manga, chapter: manga_api.Chapter) -> None:
        dm_channel = await user.create_dm()
        await dm_channel.send(embed=embed_util.chapter_embed(manga, chapter), files=embed_util.get_chapter_files(manga))