"""
Credits to Rapptz/RoboDanny

https://github.com/Rapptz/RoboDanny/blob/0dfa21599da76e84c2f8e7fde0c132ec93c840a8/cogs/utils/paginator.py
"""
import asyncio
import discord
from discord.ext.commands import Paginator as CommandPaginator
from discord.ext import menus


class RoboPages(menus.MenuPages):
    def __init__(self, source):
        super().__init__(source=source, check_embeds=True)
        self.input_lock = asyncio.Lock()

    async def finalize(self, timed_out):
        try:
            if timed_out:
                await self.message.clear_reactions()
            else:
                await self.message.delete()
        except discord.HTTPException:
            pass

    @menus.button("\N{INFORMATION SOURCE}\ufe0f", position=menus.Last(3))
    async def show_help(self):
        """shows this message"""
        embed = discord.Embed(
            title="Paginator help",
            description="Hello! Welcome to the help page.",
        )
        messages = []
        for (emoji, button) in self.buttons.items():
            messages.append(f"{emoji}: {button.action.__doc__}")

        embed.add_field(
            name="What are these reactions for?",
            value="\n".join(messages),
            inline=False,
        )
        embed.set_footer(
            text=f"We were on page {self.current_page + 1} before this message."
        )
        await self.message.edit(content=None, embed=embed)

        async def go_back_to_current_page():
            await asyncio.sleep(30.0)
            await self.show_page(self.current_page)

        self.bot.loop.create_task(go_back_to_current_page())

    @menus.button(
        "\N{INPUT SYMBOL FOR NUMBERS}", position=menus.Last(1.5), lock=False
    )
    async def numbered_page(self, payload):
        """lets you type a page number to go to"""
        if self.input_lock.locked():
            return

        async with self.input_lock:
            channel = self.message.channel
            author_id = payload.user_id
            to_delete = []
            to_delete.append(
                await channel.send("What page do you want to go to?")
            )

            def message_check(m):
                return (
                    m.author.id == author_id
                    and channel == m.channel
                    and m.content.isdigit()
                )

            try:
                msg = await self.bot.wait_for(
                    "message", check=message_check, timeout=30.0
                )
            except asyncio.TimeoutError:
                to_delete.append(await channel.send("Took too long."))
                await asyncio.sleep(5)
            else:
                page = int(msg.content)
                to_delete.append(msg)
                await self.show_checked_page(page - 1)

            try:
                await channel.delete_messages(to_delete)
            except Exception:
                pass


class FieldPageSource(menus.ListPageSource):
    """A page source that requires (field_name, field_value) tuple items."""

    def __init__(self, entries, *, per_page=12):
        super().__init__(entries, per_page=per_page)
        self.embed = discord.Embed(colour=discord.Colour.blurple())

    # pylint: disable=arguments-differ
    async def format_page(self, menu, entries):
        self.embed.clear_fields()
        self.embed.description = discord.Embed.Empty

        for key, value in entries:
            self.embed.add_field(name=key, value=value, inline=False)

        maximum = self.get_max_pages()
        if maximum > 1:
            text = f"Page {menu.current_page + 1}/{maximum} ({len(self.entries)} entries)"
            self.embed.set_footer(text=text)

        return self.embed


class TextPageSource(menus.ListPageSource):
    def __init__(self, text, *, prefix="```", suffix="```", max_size=2000):
        pages = CommandPaginator(
            prefix=prefix, suffix=suffix, max_size=max_size - 200
        )
        for line in text.split("\n"):
            pages.add_line(line)

        super().__init__(entries=pages.pages, per_page=1)

    # pylint: disable=arguments-differ
    async def format_page(self, menu, content):
        maximum = self.get_max_pages()
        if maximum > 1:
            return f"{content}\nPage {menu.current_page + 1}/{maximum}"
        return content


class SimplePageSource(menus.ListPageSource):
    def __init__(self, entries, *, per_page=12):
        super().__init__(entries, per_page=per_page)
        self.initial_page = True

    # pylint: disable=arguments-differ
    async def format_page(self, menu, entries):
        pages = []
        for index, entry in enumerate(
            entries, start=menu.current_page * self.per_page
        ):
            pages.append(f"{index + 1}. {entry}")

        maximum = self.get_max_pages()
        if maximum > 1:
            footer = f"Page {menu.current_page + 1}/{maximum} ({len(self.entries)} entries)"
            menu.embed.set_footer(text=footer)

        if self.initial_page and self.is_paginating():
            pages.append("")
            pages.append(
                "Confused? React with \N{INFORMATION SOURCE} for more info."
            )
            self.initial_page = False

        menu.embed.description = "\n".join(pages)
        return menu.embed


class SimplePages(RoboPages):
    """A simple pagination session reminiscent of the old Pages interface.
    Basically an embed with some normal formatting.
    """

    def __init__(self, entries, *, per_page=12):
        super().__init__(SimplePageSource(entries, per_page=per_page))
        self.embed = discord.Embed(colour=discord.Colour.blurple())