from manga_api import Manga, Chapter
import discord
import os.path

import requests
from util import parallel_downloads

prev_label = "Prev"
next_label = "Next"
add_label = "Add"
remove_label = "Remove"


class ListManga(discord.ui.View):
    def __init__(self, manga_list: list[Manga], user_manga_list: list[Manga]):
        super().__init__()
        self.user_manga_list = user_manga_list
        self.ret = []
        self.index = 0
        self.manga_list = manga_list
        self.thumbnail_files: list[str] = gen_manga_files(self.manga_list)
        self.comp = self.children
        self.prev_button: discord.Button = None
        self.next_button: discord.Button = None
        self.add_button: discord.Button = None
        self.remove_button: discord.Button = None

        for comp in self.comp:
            if comp.type.name == "button":
                button: discord.Button = comp
                if button.label == prev_label:
                    self.prev_button = button
                if button.label == next_label:
                    self.next_button = button
                if button.label == add_label:
                    self.add_button = button
                if button.label == remove_label:
                    self.remove_button = button
        self.msg: discord.Message = None
        print(self.manga_list)

    def set_msg(self, msg):
        self.msg = msg

    async def update_buttons(self):
        self.prev_button.disabled = self.index == 0
        self.next_button.disabled = self.index == len(self.manga_list) - 1
        self.add_button.disabled = self.manga_list[self.index] in self.user_manga_list
        self.remove.disabled = self.manga_list[self.index] not in self.user_manga_list

    async def force_reload(self):
        await self.update_buttons()

        self.msg = await self.msg.edit(
            embed=manga_embed(self.manga_list, self.index),
            attachments=[
                parallel_downloads.discord_file_from_filename(self.thumbnail_files[self.index])
            ],
            view=self
        )

    async def print_manga(self, interaction: discord.Interaction):

        await interaction.response.defer()

        await self.update_buttons()

        await self.force_reload()

    @discord.ui.button(label=prev_label, style=discord.ButtonStyle.grey)
    async def previous(self, interaction: discord.Interaction, button: discord.ui.Button):
        self.prev_button = button
        if self.index > 0:
            self.index -= 1
            print("cant go anymore back")

        await self.print_manga(interaction)

    @discord.ui.button(label=next_label, style=discord.ButtonStyle.grey)
    async def next(self, interaction: discord.Interaction, button: discord.ui.Button):
        self.next_button = button
        if self.index < len(self.manga_list) - 1:
            self.index += 1

        await self.print_manga(interaction)

    @discord.ui.button(label=add_label, style=discord.ButtonStyle.green)
    async def add(self, interaction: discord.Interaction, button: discord.ui.Button):
        self.ret.append({"manga": self.manga_list[self.index].id, "action": 1})
        if self.manga_list[self.index] not in self.user_manga_list:
            self.user_manga_list.append(self.manga_list[self.index])

        await self.print_manga(interaction)

    @discord.ui.button(label=remove_label, style=discord.ButtonStyle.red)
    async def remove(self, interaction: discord.Interaction, button: discord.ui.Button):
        self.ret.append({"manga": self.manga_list[self.index].id, "action": -1})
        if self.manga_list[self.index] in self.user_manga_list:
            self.user_manga_list.remove(self.manga_list[self.index])

        await self.print_manga(interaction)

    @discord.ui.button(label='Done', style=discord.ButtonStyle.blurple)
    async def exit(self, interaction: discord.Interaction, button: discord.ui.Button):
        if len(self.ret) > 0:
            await interaction.response.send_message("Your list has been altered successfully", ephemeral=True)
        else:
            await interaction.response.send_message("You didn't make any changes", ephemeral=True)
        self.stop()


def gen_manga_files(manga_list: list[Manga]):
    return parallel_downloads.parallel_download(manga_list)


def manga_embed(manga_list: list[Manga], index: int):
    manga = manga_list[index]
    e = discord.Embed(title=f"({index + 1}\\{len(manga_list)}) {manga.get_title()}",
                      description=manga.get_description(), url=manga.get_url())
    extension = manga.get_cover_art_extension()
    e.set_thumbnail(url=f"attachment://{manga.id}.{extension}")

    return e

def manga_list_embed(manga_list: list[Manga]):
    e = discord.Embed(
        title=f"Here's The Manga That Match Your Query ({len(manga_list)} Items)",
        description="".join(
            [f"{index+1} - {manga_list[index].get_title()}\n" for index in range(len(manga_list))]
        ),
        color=discord.Color.blurple()
    )

    return e


def get_chapter_filenames(manga: Manga):
    return parallel_downloads.parallel_download([manga])


def chapter_embed(manga: Manga, chapter: Chapter):
    volume_info = f"Volume {chapter.get_volume()}" if chapter.get_volume() else ""
    chapter_title = f"{chapter.get_title()}" if chapter.get_title() else ""
    e = discord.Embed(
        title=f'"{manga.get_title()}" Chapter {chapter_title} Released!',
        description=f"{volume_info} Chapter {chapter.get_number()} of {manga.get_title()} Released."
                    f"\nGo read it now!",
        url=chapter.get_url()
    )
    e.set_thumbnail(url=f"attachment://{manga.id}.{manga.get_cover_art_extension()}")
    return e