# Copyright 2016 Mycroft AI, Inc.
#
# This file is part of Mycroft Core.
#
# Mycroft Core is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Mycroft Core is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Mycroft Core.  If not, see <http://www.gnu.org/licenses/>.
import abc
import re

__author__ = 'jdorleans'


class AbstractTimeRules(object):
    def __init__(self):
        self.rules = None
        self.init_rules()
        self.build_repeat_time_regex()
        self.build_time_regex()

    @abc.abstractmethod
    def init_rules(self):
        pass

    @abc.abstractmethod
    def build_repeat_time_regex(self):
        pass

    def build_time_regex(self):
        for idx, regex in enumerate(self.rules.get('time_regex')):
            regex = regex.replace('<time_advs>', self.rules.get('time_advs'))
            regex = regex.replace('<day_parts>', self.rules.get('day_parts'))
            regex = regex.replace('<time_units>', self.rules.get('time_units'))
            regex = regex.replace('<week_days>', self.rules.get('week_days'))
            regex = regex.replace('<months>', self.rules.get('months'))
            regex = regex.replace('<mealtimes>', self.rules.get('mealtimes'))
            regex = regex.replace(
                '<celebrations>', self.rules.get('celebrations'))
            regex = regex.replace(
                '<repeat_time_regex>', self.rules.get('repeat_time_regex'))
            self.rules.get('time_regex')[idx] = regex.lower()

    # days is an array starting from Monday (0) to Sunday (6)
    def get_week_days(self, sentence):
        days = None
        pattern = re.compile(
            self.rules.get('repeat_time_regex'), re.IGNORECASE)
        result = pattern.search(sentence)
        if result:
            group = result.group()
            if self.is_all_days(group):
                days = [True, True, True, True, True, True, True]
            else:
                days = [False, False, False, False, False, False, False]
                self.fill_week_days(group, days)
        return days

    @abc.abstractmethod
    def is_all_days(self, group):
        pass

    @abc.abstractmethod
    def fill_week_days(self, group, days):
        pass


class TimeRulesEnUs(AbstractTimeRules):
    def __init__(self):
        super(TimeRulesEnUs, self).__init__()

    def init_rules(self):
        self.rules = {
            'time_advs': 'today|tonight|tomorrow',
            'time_units': 'second|minute|hour|day|week|month|year',
            'day_parts': 'dawn|morning|noon|afternoon|evening|night|midnight',
            'week_days': (
                'monday|tuesday|wednesday|thursday|friday|saturday|sunday'),
            'months': (
                'january|february|march|april|may|june|july|august|october|'
                'september|november|december'),
            'mealtimes': (
                'breakfast|lunchtime|teatime|dinnertime|lunch time|tea time|'
                'dinner time'),
            'celebrations': 'easter|christmas',
            'repeat_time_regex': (
                '((every|each|all) (single )?(day|(<week_days>)s?( (and )?'
                '(<week_days>)s?)*))|daily|everyday'),
            'time_regex': [
                '(<time_advs>)',
                '((at|in the|during the|tomorrow)\s)?(<day_parts>)',
                '(in )?(a|an|one|two|\d+\.?\d*) (<time_units>)s?( later)?',
                'on (<week_days>)',
                '(on|the) (\d+(rd|st|nd|th)?\s)?(<months>)( the )?'
                '(\s\d+(rd|st|nd|th)?)?(\s?,?\s?\d*)?',
                'in (\d\d\d\d)', 'at (<mealtimes>|<celebrations>)',
                "(at|by) \d+((:| and )\d+)?( and a (quarter|half))?"
                "\s?((a\.?m\.?|p\.?m\.?)|o'clock)?",
                '(in |in the )?next (<time_units>|<day_parts>|<week_days>'
                '|<months>|<mealtimes>|<celebrations>)s?',
                '<repeat_time_regex>'
            ]
        }

    def build_repeat_time_regex(self):
        week_days = self.rules.get('week_days')
        repeat_time_regex = self.rules.get('repeat_time_regex')
        self.rules['repeat_time_regex'] = repeat_time_regex.replace(
            '<week_days>', week_days)

    def is_all_days(self, group):
        for d in [' day', 'daily', 'everyday']:
            if group.__contains__(d):
                return True
        return False

    def fill_week_days(self, group, days):
        if group.__contains__('monday'):
            days[0] = True
        if group.__contains__('tuesday'):
            days[1] = True
        if group.__contains__('wednesday'):
            days[2] = True
        if group.__contains__('thursday'):
            days[3] = True
        if group.__contains__('friday'):
            days[4] = True
        if group.__contains__('saturday'):
            days[5] = True
        if group.__contains__('sunday'):
            days[6] = True


class TimeRulesPtBr(AbstractTimeRules):
    def __init__(self):
        super(TimeRulesPtBr, self).__init__()

    def init_rules(self):
        pass

    def build_repeat_time_regex(self):
        pass

    def is_all_days(self, group):
        pass

    def fill_week_days(self, group, days):
        pass


KEY_MAP = {
    'en-us': TimeRulesEnUs,
    'pt-br': TimeRulesPtBr
}


def create(lang):
    clazz = KEY_MAP.get(lang)
    if not clazz:
        clazz = TimeRulesEnUs
    return clazz()
