from discord import Guild, Member, Message
from discord.ext import commands
import re
from datetime import timedelta

from cogs.basecog import BaseCog, BotMessage, BotMessageReaction
from config import CONFIG
from storage import Storage

class URLSpamContext:
	def __init__(self, spam_message: Message):
		self.spam_message = spam_message
		self.is_deleted = False
		self.is_kicked = False
		self.is_banned = False

class URLSpamCog(BaseCog):
	CONFIG_KEY_EARLY_URL_TIMEOUT = "urlspam_early_url_timeout"
	CONFIG_KEY_EARLY_URL_ACTION = "urlspam_early_url_action"

	def __init__(self, bot):
		super().__init__(bot)

	def __early_url_timeout(self, guild: Guild) -> int:
		return Storage.get_config_value(guild, self.CONFIG_KEY_EARLY_URL_TIMEOUT) or \
			self.get_cog_default('early_url_timeout')

	def __early_url_action(self, guild: Guild) -> str:
		return Storage.get_config_value(guild, self.CONFIG_KEY_EARLY_URL_ACTION) or \
			self.get_cog_default('early_url_action')

	@commands.Cog.listener()
	async def on_message(self, message: Message):
		if message.author is None or \
				message.author.bot or \
				message.guild is None or \
				message.channel is None or \
				message.content is None:
			return

		action = self.__early_url_action(message.guild)
		if action == 'nothing':
			return
		if not self.__contains_url(message.content):
			return
		join_age = message.created_at - message.author.joined_at
		join_age_str = self.__format_timedelta(join_age)
		if join_age.total_seconds() < self.__early_url_timeout(message.guild):
			if action == 'modwarn':
				bm = BotMessage(
					message.guild,
					f'User {message.author.mention} posted a URL ' + \
					f'{join_age_str} after joining.',
					type = BotMessage.TYPE_MOD_WARNING,
					context = URLSpamContext(message))
				bm.quote = message.content
				await bm.add_reaction(BotMessageReaction(CONFIG['trash_emoji'], True, 'Delete message'))
				await bm.add_reaction(BotMessageReaction(CONFIG['kick_emoji'], True, 'Kick user'))
				await bm.add_reaction(BotMessageReaction(CONFIG['ban_emoji'], True, 'Ban user'))
				await self.post_message(bm)
				self.log(message.guild, f'New user {message.author.name} ' + \
					f'({message.author.id}) posted URL. Mods alerted.')
			elif action == 'delete':
				await message.delete()
				bm = BotMessage(
					message.guild,
					f'User {message.author.mention} posted a URL ' + \
					f'{join_age_str} after joining. Message deleted.',
					type = BotMessage.TYPE_INFO,
					context = URLSpamContext(message))
				bm.quote = message.content
				await bm.add_reaction(BotMessageReaction(CONFIG['kick_emoji'], True, 'Kick user'))
				await bm.add_reaction(BotMessageReaction(CONFIG['ban_emoji'], True, 'Ban user'))
				await self.post_message(bm)
				self.log(message.guild, f'New user {message.author.name} ' + \
					f'({message.author.id}) posted URL. Message deleted.')
			elif action == 'kick':
				await message.author.kick(reason='User posted a link ' + \
					f'{join_age_str} after joining')
				bm = BotMessage(
					message.guild,
					f'User {message.author.mention} posted a URL ' + \
					f'{join_age_str} after joining. Kicked by bot.',
					type = BotMessage.TYPE_INFO,
					context = URLSpamContext(message))
				bm.quote = message.content
				await bm.add_reaction(BotMessageReaction(CONFIG['ban_emoji'], True, 'Ban user'))
				await self.post_message(bm)
				self.log(message.guild, f'New user {message.author.name} ' + \
					f'({message.author.id}) posted URL. User kicked.')
			elif action == 'ban':
				await message.author.ban(reason='User posted a link ' + \
					f'{join_age_str} after joining', delete_message_days=1)
				bm = BotMessage(
					message.guild,
					f'User {message.author.mention} posted a URL ' + \
					f'{join_age_str} after joining. Banned by bot.',
					type = BotMessage.TYPE_INFO,
					context = URLSpamContext(message))
				bm.quote = message.content
				await self.post_message(bm)
				self.log(message.guild, f'New user {message.author.name} ' + \
					f'({message.author.id}) posted URL. User banned.')

	async def on_mod_react(self,
			bot_message: BotMessage,
			reaction: BotMessageReaction,
			reacted_by: Member) -> None:
		context: URLSpamContext = bot_message.context
		if context is None:
			return
		sm: Message = context.spam_message
		if reaction.emoji == CONFIG['trash_emoji']:
			if not context.is_deleted:
				await sm.delete()
				context.is_deleted = True
				self.log(sm.guild, f'URL spam by {sm.author.name} deleted by {reacted_by.name}')
		elif reaction.emoji == CONFIG['kick_emoji']:
			if not context.is_deleted:
				await sm.delete()
				context.is_deleted = True
			if not context.is_kicked:
				await sm.author.kick(reason=f'Rocketbot: Kicked for URL spam by {reacted_by.name}')
				context.is_kicked = True
				self.log(sm.guild, f'URL spammer {sm.author.name} kicked by {reacted_by.name}')
		elif reaction.emoji == CONFIG['ban_emoji']:
			if not context.is_banned:
				await sm.author.ban(reason=f'Rocketbot: Banned for URL spam by {reacted_by.name}', delete_message_days=1)
				context.is_deleted = True
				context.is_kicked = True
				context.is_banned = True
				self.log(sm.guild, f'URL spammer {sm.author.name} banned by {reacted_by.name}')
		else:
			return
		await bot_message.set_reactions(BotMessageReaction.standard_set(
			did_delete=context.is_deleted,
			did_kick=context.is_kicked,
			did_ban=context.is_banned))

	def __contains_url(self, text: str) -> bool:
		p = re.compile(r'http(?:s)?://[^\s]+')
		return p.search(text) is not None

	def __format_timedelta(self, timespan: timedelta) -> str:
		parts = []
		d = timespan.days
		h = timespan.seconds // 3600
		m = (timespan.seconds // 60) % 60
		s = timespan.seconds % 60
		if d > 0:
			parts.append(f'{d} days')
		if d > 0 or h > 0:
			parts.append(f'{h} hours')
		if d > 0 or h > 0 or m > 0:
			parts.append(f'{m} minutes')
		parts.append(f'{s} seconds')
		# Limit the precision to the two most significant elements
		while len(parts) > 2:
			parts.pop(-1)
		return ' '.join(parts)