#!/usr/bin/env python3
import re

import formatting
from module import commands, priority, OP, HALFOP, require_privilege, require_chanmsg
from tools import Identifier


def default_mask(trigger):
	welcome = formatting.color('Welcome to:', formatting.colors.PURPLE)
	chan = formatting.color(trigger.sender, formatting.colors.TEAL)
	topic_ = formatting.bold('Topic:')
	topic_ = formatting.color('| ' + topic_, formatting.colors.PURPLE)
	arg = formatting.color('{}', formatting.colors.GREEN)
	return '{} {} {} {}'.format(welcome, chan, topic_, arg)


@require_chanmsg
@require_privilege(OP, 'You are not a channel operator.')
@commands('kick')
@priority('high')
def kick(bot, trigger):
	"""
	Kick a user from the channel.
	"""
	if bot.privileges[trigger.sender][bot.nick] < HALFOP:
		return bot.reply("I'm not a channel operator!")
	text = trigger.group().split()
	argc = len(text)
	if argc < 2:
		return
	opt = Identifier(text[1])
	nick = opt
	channel = trigger.sender
	reasonidx = 2
	if not opt.is_nick():
		if argc < 3:
			return
		nick = text[2]
		channel = opt
		reasonidx = 3
	reason = ' '.join(text[reasonidx:])
	if nick != bot.config.core.nick:
		bot.write(['KICK', channel, nick], reason)


def configureHostMask(mask):
	if mask == '*!*@*':
		return mask
	if re.match('^[^.@!/]+$', mask) is not None:
		return '%s!*@*' % mask
	if re.match('^[^@!]+$', mask) is not None:
		return '*!*@%s' % mask

	m = re.match('^([^!@]+)@$', mask)
	if m is not None:
		return '*!%s@*' % m.group(1)

	m = re.match('^([^!@]+)@([^@!]+)$', mask)
	if m is not None:
		return '*!%s@%s' % (m.group(1), m.group(2))

	m = re.match('^([^!@]+)!(^[!@]+)@?$', mask)
	if m is not None:
		return '%s!%s@*' % (m.group(1), m.group(2))
	return ''


@require_chanmsg
@require_privilege(OP, 'You are not a channel operator.')
@commands('ban')
@priority('high')
def ban(bot, trigger):
	"""
	This give admins the ability to ban a user.
	The bot must be a Channel Operator for this command to work.
	"""
	if bot.privileges[trigger.sender][bot.nick] < HALFOP:
		return bot.reply("I'm not a channel operator!")
	text = trigger.group().split()
	argc = len(text)
	if argc < 2:
		return
	opt = Identifier(text[1])
	banmask = opt
	channel = trigger.sender
	if not opt.is_nick():
		if argc < 3:
			return
		channel = opt
		banmask = text[2]
	banmask = configureHostMask(banmask)
	if banmask == '':
		return
	bot.write(['MODE', channel, '+b', banmask])


@require_chanmsg
@require_privilege(OP, 'You are not a channel operator.')
@commands('unban')
def unban(bot, trigger):
	"""
	This give admins the ability to unban a user.
	The bot must be a Channel Operator for this command to work.
	"""
	if bot.privileges[trigger.sender][bot.nick] < HALFOP:
		return bot.reply("I'm not a channel operator!")
	text = trigger.group().split()
	argc = len(text)
	if argc < 2:
		return
	opt = Identifier(text[1])
	banmask = opt
	channel = trigger.sender
	if not opt.is_nick():
		if argc < 3:
			return
		channel = opt
		banmask = text[2]
	banmask = configureHostMask(banmask)
	if banmask == '':
		return
	bot.write(['MODE', channel, '-b', banmask])


@require_chanmsg
@require_privilege(OP, 'You are not a channel operator.')
@commands('kickban', 'kb')
@priority('high')
def kickban(bot, trigger):
	"""
	This gives admins the ability to kickban a user.
	The bot must be a Channel Operator for this command to work.
	.kickban [#chan] user1 user!*@* get out of here
	"""
	if bot.privileges[trigger.sender][bot.nick] < HALFOP:
		return bot.reply("I'm not a channel operator!")
	text = trigger.group().split()
	argc = len(text)
	if argc < 4:
		return
	opt = Identifier(text[1])
	nick = opt
	mask = text[2]
	channel = trigger.sender
	reasonidx = 3
	if not opt.is_nick():
		if argc < 5:
			return
		channel = opt
		nick = text[2]
		mask = text[3]
		reasonidx = 4
	reason = ' '.join(text[reasonidx:])
	mask = configureHostMask(mask)
	if mask == '':
		return
	bot.write(['MODE', channel, '+b', mask])
	bot.write(['KICK', channel, nick], reason)


@require_chanmsg
@require_privilege(OP, 'You are not a channel operator.')
@commands('topic')
def topic(bot, trigger):
	"""
	This gives ops the ability to change the topic.
	The bot must be a Channel Operator for this command to work.
	"""
	if bot.privileges[trigger.sender][bot.nick] < HALFOP:
		return bot.reply("I'm not a channel operator!")
	if not trigger.group(2):
		return
	channel = trigger.sender.lower()

	narg = 1
	mask = None
	mask = bot.db.get_channel_value(channel, 'topic_mask')
	mask = mask or default_mask(trigger)
	mask = mask.replace('%s', '{}')
	narg = len(re.findall('{}', mask))

	top = trigger.group(2)
	args = []
	if top:
		args = top.split('~', narg)

	if len(args) != narg:
		message = "Not enough arguments. You gave {}, it requires {}.".format(
			len(args), narg)
		return bot.say(message)
	topic = mask.format(*args)

	bot.write(('TOPIC', channel + ' :' + topic))


@require_chanmsg
@require_privilege(OP, 'You are not a channel operator.')
@commands('tmask')
def set_mask(bot, trigger):
	"""
	Set the mask to use for .topic in the current channel. {} is used to allow
	substituting in chunks of text.
	"""
	bot.db.set_channel_value(trigger.sender, 'topic_mask', trigger.group(2))
	bot.say("Gotcha, " + trigger.nick)


@require_chanmsg
@require_privilege(OP, 'You are not a channel operator.')
@commands('showmask')
def show_mask(bot, trigger):
	"""Show the topic mask for the current channel."""
	mask = bot.db.get_channel_value(trigger.sender, 'topic_mask')
	mask = mask or default_mask(trigger)
	bot.say(mask)