#!/usr/bin/env python3
"""
Fulvia Spelling correction module

This module will fix spelling errors if someone corrects them
using the sed notation (s///) commonly found in vi/vim.
"""
import re

from module import hook


def setup(bot):
	bot.memory['sed_lines'] = {}


@hook(True)
def collectlines(bot, trigger):
	"""Create a temporary log of what people say"""
	if trigger.is_privmsg:
		return

	if trigger.channel not in bot.memory['sed_lines']:
		bot.memory['sed_lines'][trigger.channel] = {}
	if trigger.nick not in bot.memory['sed_lines'][trigger.channel]:
		bot.memory['sed_lines'][trigger.channel][trigger.nick] = []

	templist = bot.memory['sed_lines'][trigger.channel][trigger.nick]
	line = ' '.join(trigger.args)
	if line.startswith("s/"):  # Don't remember substitutions
		return
	templist.append(line)

	del templist[:-10]  # Keep the log to 10 lines per person

	bot.memory['sed_lines'][trigger.channel][trigger.nick] = templist


@hook(True)
def findandreplace(bot, trigger):
	if trigger.is_privmsg:
		return
	if not trigger.args[0].startswith('s') and trigger.args[0][-1] not in ':,':
		return
	line = ' '.join(trigger.args)
	if 's/' not in line:
		return

	items = []
	line = line[line.index('s/')+2:]
	i = 0
	while True:
		i = line.find('/', i)
		if i == -1:
			break
		if line[max(i-1, 0)] == '\\' and line[max(i-2, 0)] != '\\':
			i += 1
			pass
		else:
			items.append(line[:i])
			line = line[i+1:]
			i = 0
	items.append(line)

	if len(items) < 2:
		return
	find, replace = items[:2]
	find = find.replace(r'\/', '/')
	flags = items[2] if len(items) >= 3 else ''

	if 'g' in flags:
		count = 0
	else:
		count = 1

	try:
		if 'i' in flags:
			regex = re.compile(find, re.I)
		else:
			regex = re.compile(find)
	except re.error:
		return

	if not trigger.args[0].startswith('s'):
		nick = trigger.args[0][:-1]
		if nick not in bot.memory['sed_lines'][trigger.channel]:
			return
	else:
		nick = trigger.nick

	for line in reversed(bot.memory['sed_lines'][trigger.channel][nick]):
		new_line = re.sub(regex, replace, line, count)
		if new_line != line:
			break
	else:
		return

	if trigger.args[0].startswith('s'):
		msg = f"{trigger.nick} \x02meant\x0f to say: {new_line}"
	else:
		msg = f"{trigger.nick} thinks {nick} \x02meant\x0f to say: {new_line}"

	bot.msg(msg)