#!/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
from tools import FulviaMemory


def setup(bot):
	bot.memory['find_lines'] = FulviaMemory()


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

	# Don't log things in PM
	if trigger.is_privmsg:
		return

	# Add a log for the channel and nick, if there isn't already one
	if trigger.channel not in bot.memory['find_lines']:
		bot.memory['find_lines'][trigger.channel] = FulviaMemory()
	if trigger.nick not in bot.memory['find_lines'][trigger.channel]:
		bot.memory['find_lines'][trigger.channel][trigger.nick] = list()

	# Create a temporary list of the user's lines in a channel
	templist = bot.memory['find_lines'][trigger.channel][trigger.nick]
	line = trigger.group()
	if line.startswith("s/"):  # Don't remember substitutions
		return
	elif line.startswith("\x01ACTION"):  # For /me messages
		line = line[:-1]
		templist.append(line)
	else:
		templist.append(line)

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

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


#Match nick, s/find/replace/flags. Flags and nick are optional, nick can be
#followed by comma or colon, anything after the first space after the third
#slash is ignored, you can escape slashes with backslashes, and if you want to
#search for an actual backslash followed by an actual slash, you're shit out of
#luck because this is the fucking regex of death as it is.
# @rule(r"""(?:
#             (\S+)           # Catch a nick in group 1
#           [:,]\s+)?         # Followed by colon/comma and whitespace, if given
#           s/                # The literal s/
#           (                 # Group 2 is the thing to find
#             (?:\\/ | [^/])+ # One or more non-slashes or escaped slashes
#           )/(               # Group 3 is what to replace with
#             (?:\\/ | [^/])* # One or more non-slashes or escaped slashes
#           )
#           (?:/(\S+))?       # Optional slash, followed by group 4 (flags)
#           """)
@hook(True)
def findandreplace(bot, trigger):
	# Don't bother in PM
	if trigger.is_privmsg:
		return

	rule = re.compile(r"(\S+)?(?:[:,]\s|^)s\/((?:\\\/|[^/])+)\/((?:\\\/|[^/])*"\
		 + r")(?:\/(\S+))?")
	group = rule.search(trigger.group(0))
	if not group:
		return
	g = (trigger.group(0),) + group.groups()
	trigger.set_group(g, bot.config)

	# Correcting other person vs self.
	rnick = (trigger.group(1) or trigger.nick)

	search_dict = bot.memory['find_lines']
	# only do something if there is conversation to work with
	if trigger.channel not in search_dict:
		return
	if rnick not in search_dict[trigger.channel]:
		return

	#TODO rest[0] is find, rest[1] is replace. These should be made variables of
	#their own at some point.
	rest = [trigger.group(2), trigger.group(3)]
	rest[0] = rest[0].replace(r'\/', '/')
	rest[1] = rest[1].replace(r'\/', '/')
	me = False  # /me command
	flags = (trigger.group(4) or '')
	print(flags)

	# If g flag is given, replace all. Otherwise, replace once.
	if 'g' in flags:
		count = 0
	else:
		count = 1

	# repl is a lambda function which performs the substitution. i flag turns
	# off case sensitivity. re.U turns on unicode replacement.
	if 'i' in flags:
		regex = re.compile(re.escape(rest[0]), re.U | re.I)
		repl = lambda s: re.sub(regex, rest[1], s, count == 1)
	else:
		repl = lambda s: re.sub(rest[0], rest[1], s, count)

	# Look back through the user's lines in the channel until you find a line
	# where the replacement works
	new_phrase = None
	for line in reversed(search_dict[trigger.channel][rnick]):
		if line.startswith("\x01ACTION"):
			me = True  # /me command
			line = line[8:]
		else:
			me = False
		new_phrase = repl(line)
		if new_phrase != line:  # we are done
			break

	if not new_phrase or new_phrase == line:
		return  # Didn't find anything

	# Save the new "edited" message.
	action = (me and '\x01ACTION ') or ''  # If /me message, prepend \x01ACTION
	templist = search_dict[trigger.channel][rnick]
	templist.append(action + new_phrase)
	search_dict[trigger.channel][rnick] = templist
	bot.memory['find_lines'] = search_dict

	# output
	if not me:
		new_phrase = f"\x02meant\x0f to say: {new_phrase}"
	if trigger.group(1):
		phrase = f"{trigger.nick} thinks {rnick} {new_phrase}"
	else:
		phrase = f"{trigger.nick} {new_phrase}"

	bot.msg(phrase)