import discord
import traceback
import datetime
import logging
from discord.ext import commands
from core.utils.chat_formatting import inline

log = logging.getLogger("red")


def init_events(bot):

    @bot.event
    async def on_connect():
        if bot.uptime is None:
            print("Connected to Discord. Getting ready...")

    @bot.event
    async def on_ready():
        if bot.uptime is None:
            bot.uptime = datetime.datetime.utcnow()
            print("Loading cogs...")
            # load the packages at this point
            total_channels = len([c for c in bot.get_all_channels()])
            total_users = len(set([m for m in bot.get_all_members()]))
            print("Ready and operational on {} servers.\n"
                  "".format(len(bot.guilds)))

    @bot.event
    async def on_command_error(error, ctx):
        if isinstance(error, commands.MissingRequiredArgument):
            await bot.send_cmd_help(ctx)
        elif isinstance(error, commands.BadArgument):
            await bot.send_cmd_help(ctx)
        elif isinstance(error, commands.DisabledCommand):
            await ctx.send("That command is disabled.")
        elif isinstance(error, commands.CommandInvokeError):
            # Need to test if the following still works
            """
            no_dms = "Cannot send messages to this user"
            is_help_cmd = ctx.command.qualified_name == "help"
            is_forbidden = isinstance(error.original, discord.Forbidden)
            if is_help_cmd and is_forbidden and error.original.text == no_dms:
                msg = ("I couldn't send the help message to you in DM. Either"
                       " you blocked me or you disabled DMs in this server.")
                await ctx.send(msg)
                return
            """
            log.exception("Exception in command '{}'"
                          "".format(ctx.command.qualified_name),
                          exc_info=error.original)
            message = ("Error in command '{}'. Check your console or "
                       "logs for details."
                       "".format(ctx.command.qualified_name))
            exception_log = ("Exception in command '{}'\n"
                             "".format(ctx.command.qualified_name))
            exception_log += "".join(traceback.format_exception(type(error),
                                     error, error.__traceback__))
            bot._last_exception = exception_log
            await ctx.send(inline(message))
        elif isinstance(error, commands.CommandNotFound):
            pass
        elif isinstance(error, commands.CheckFailure):
            await ctx.send("⛔")
        elif isinstance(error, commands.NoPrivateMessage):
            await ctx.send("That command is not available in DMs.")
        elif isinstance(error, commands.CommandOnCooldown):
            await ctx.send("This command is on cooldown. "
                           "Try again in {:.2f}s"
                           "".format(error.retry_after))
        else:
            log.exception(type(error).__name__, exc_info=error)

    @bot.event
    async def on_message(message):
        bot.counter["messages_read"] += 1
        await bot.process_commands(message)

    @bot.event
    async def on_resumed():
        bot.counter["sessions_resumed"] += 1

    @bot.event
    async def on_command(command):
        bot.counter["processed_commands"] += 1