import discord
import io
import sys

client = discord.Client()

@client.event
async def on_ready():
    print('logged in as {0.user}'.format(client), file=sys.stderr)

@client.event
async def on_message(message):
    if message.author == client.user:
        return

    if ('spoil' in message.content.lower()
        and message.author.is_on_mobile()
        and message.attachments
        and not any(a.is_spoiler() for a in message.attachments)):

        attachments = []
        try:
            for a in message.attachments:
                f = await a.to_file()
                f.filename = 'SPOILER_' + f.filename
                attachments.append(f)
        except (discord.HTTPException, discord.Forbidden, discord.NotFound) as e:
            print('error reading attachments: {0}'.format(e), file=sys.stderr)
            return

        try:
            await message.channel.send("{0} says: {1}".format(message.author.mention, message.content), files=attachments)
        except (discord.HTTPException, discord.Forbidden, discord.InvalidArgument) as e:
            print('error sending message: {0}'.format(e), file=sys.stderr)
            return

        try:
            await message.delete()
        except (discord.HTTPException, discord.Forbidden, discord.NotFound) as e:
            print('error deleting message: {0}'.format(e))
            return

with open('token') as f:
    token = f.read().strip()
client.run(token)