import math

import discord
from discord.ext import commands

from functions import get_avatar


class Help(commands.Cog):
    def __init__(self, bot):
        self.bot = bot
        self.bot.remove_command('help')

    @commands.command(aliases=['h', '?'])
    async def help(self, ctx, page=1):
        """Displays the help command"""
        em = discord.Embed(
            title = 'Help Command'
            colour = 0x00FF00
            )
        cog_list = [c for c in self.bot.cogs.keys()]
        page_count = math.ceil(len(cog_list) / 4)

        page = int(page)
        if page > page_count or page < 1:
            await ctx.send(f'Page number \'{page}\' not found.')
            return

        cogs_needed = []
        for i in range(4):
            x = i + (int(page) - 1) * 4
            try:
                cogs_needed.append(cog_list[x])
            except IndexError:
                pass

        for cog in cogs_needed:
            command_list = ''
            for command in self.bot.get_cog(cog).get_commands():
                showcommand = True
                if command.hidden or command.parent:
                    showcommand = False
                for check in command.checks:
                    try:
                        check(ctx)
                    except commands.MissingPermissions:
                        showcommand = False
                if showcommand:
                    command_list += f'**{ctx.prefix}{command.name}** - {command.help}\n'
            if command_list:
                em.add_field(name=cog, value=command_list, inline=False)
        em.set_footer(text=f'Requested by {ctx.message.author}', icon_url=get_avatar(
            ctx.message.author))
        await ctx.send(embed=em)


def setup(bot):
    bot.add_cog(Help(bot))