import chat.dice as dice
import chat.response as response
from chat.command_exception import CommandException
import re


class CommandHandler:
    def __init__(self, skill_dict):
        self.commands = {
            '/roll': self.custom_roll,
            '/r': self.custom_roll,
            '/whisper': self.whisper,
            '/w': self.whisper
        }
        self.skill_dict = skill_dict

    def handle(self, char, content):
        message = content.strip('\n')
        if message[0] == '.':
            return self.skill_roll(char, message)
        else:
            message = message.split(' ', 1)
            if (len(message) > 1) and (message[0] in self.commands):
                func = self.commands[message[0]]
                r = func(char, message)
                return r
            return response.build_public_message(char, content)

    def custom_roll(self, char, message):
        pattern = '(?P<dice_num>\d+)(?:d|w)(?P<dice_val>\d+)(?P<maths>(?:(?:\+|\-)\d+)*)'
        command = re.sub('\s+', '', message[1])

        match = re.match(pattern, command)
        if match is None:
            return response.build_system_message(char,
                                                 'Ungültige Formatierung des Befehls: {}'.format(' '.join(message)))

        eyes, result = dice.custom_roll(int(match.group('dice_num')),
                                        int(match.group('dice_val')),
                                        match.group('maths'))
        return response.build_dice_roll(char, ' '.join(message), eyes, result)

    def skill_roll(self, char, message):
        if char not in self.skill_dict:
            return response.build_system_message(char, 'Ungültiger Charakter: {}'.format(char))

        pattern = '(?P<skill>[a-zA-ZäöüÄÖÜß .&]+)(?P<maths>(?:\s*(?:\+|\-)\s*\d+)*)(?P<type>[nrs]?)'
        match = re.match(pattern, message)
        if match is None:
            return response.build_system_message(char,
                                                 'Unültige Formatierung des Befehls: {}'.format(message))

        skills = self.skill_dict[char]
        skill = match.group('skill')[1:]
        skill = skill.rstrip(' ')
        if skill not in skills:
            return response.build_system_message(char,
                    '{} hat die Fertigkeit {} nicht.'.format(char, skill))

        value = skills[skill]
        type_ = match.group('type')
        if len(type_) == 0 or type_ == 'n':
            type_ = dice.RollTypes.NORMAL
        elif type_ == 'r':
            type_ = dice.RollTypes.RISKY
        else:
            type_ = dice.RollTypes.SAFE
        eyes, result = dice.skill_roll(value,
                                       match.group('maths'),
                                       type_)
        return response.build_dice_roll(char, message, eyes, result)

    def whisper(self, char, message):
        recipient, message = message.split(' ', 1)
        return response.build_private_message(char, message, recipient)