"""
Defines a matrix bot handler that uses regex to determine if message should be handled
"""
import re

from matrix_bot_api.mhandler import MHandler


class MRegexHandler(MHandler):

    # regex_str - Regular expression to test message against
    #
    # handle_callback - Function to call if messages matches regex
    def __init__(self, regex_str, handle_callback, bot):
        MHandler.__init__(self, self.test_regex, handle_callback)
        self.name = bot.config['character']['sensitivity_name']

        regex_str_temp = "{} {}".format(self.name, regex_str)
        self.regex_str = regex_str_temp

        for key,value in bot.aliases.items():
            if (value == regex_str_temp):
                self.regex_str += "|{}".format(key)

    def test_regex(self, room, event):
        r = r'^{}'.format(self.regex_str)

        # Test the message and see if it matches the regex
        if event['type'] == "m.room.message":
            if re.search(r, event['content']['body'], re.I):
                # The message matches the regex, return true
                return True

        return False