import requests
import urllib.parse
import json
import datetime

from . import utils



class CalendarMetadata():

    def __init__(
        self,
        name: str,
        id: int,
        translations: dict,
    ):
        self.name = name
        self.id = id
        self.translations = translations

    def to_dict(self):
        translations = {
            f'calendar_name_translation_{k}': v for k, v in self.translations.items()
        }
        return {
            'calendar_name': self.name,
            'calendar_id': self.id,
            **translations,
        }

class Wordpress():

    def __init__(
        self,
        base_url: str,
        *,
        calendar_metadata: CalendarMetadata,
        credentials: dict,
    ):
        self.base_url = base_url
        self.session = requests.Session()
        self.credentials = credentials
        self.calendar_meadata = calendar_metadata

    def login(self):
        login_request = self.session.post(
            f'{self.base_url}/wp-login.php',
            data={
                'log': self.credentials['user'],
                'pwd': self.credentials['password'],
                'wp-submit': 'Anmelden',
                'redirect_to': f'{self.base_url}/wp-admin/',
                'testcookie': 1,
            }
        )
        return login_request

    def _datestr_to_date(self, s, tz=None):
        if s.endswith('Z'):
            s = s[:-1]
        return datetime.datetime.fromisoformat(s).astimezone().date()

    def _generate_data_single(self, event, item_id=2):
        start = event['start']
        end = event['end']
        summary = event['summary']

        day_increment = datetime.timedelta(days=1)

        if 'date' in start:
            start = self._datestr_to_date(start['date'])
        elif 'dateTime' in start:
            start = self._datestr_to_date(start['dateTime'], tz=start['timeZone'])
        else:
            raise ValueError('Cannot process event')

        if 'date' in end:
            end = self._datestr_to_date(end['date'])
        elif 'dateTime' in end:
            end = self._datestr_to_date(end['dateTime'], tz=end['timeZone'])
            end += day_increment # if its a time on a day, we want to add one, in order to also include it in the update
        else:
            raise ValueError('Cannot process event')

        flow = start
        dictionary = {}
        while flow < end:
            dictionary.setdefault(flow.year, {})
            dictionary[flow.year].setdefault(flow.month, {})
            dictionary[flow.year][flow.month].setdefault(flow.day, {})
            dictionary[flow.year][flow.month][flow.day] = {
                    'description': summary,
                    'legend_item_id': item_id,
            }
            flow += day_increment
        return dictionary

    def _fill_empty(self, d, *, start: datetime.datetime, until: datetime.timedelta):
        day_increment = datetime.timedelta(days=1)
        flow = start
        while flow < start + until:
            d.setdefault(flow.year, {})
            d[flow.year].setdefault(flow.month, {})
            d[flow.year][flow.month].setdefault(flow.day, {})
            d[flow.year][flow.month][flow.day].setdefault('legend_item_id', 1)
            d[flow.year][flow.month][flow.day].setdefault('description', '')
            flow += day_increment
        return d

    def _generate_data(
            self,
            events,
            start: datetime.datetime | None=None,
            until: datetime.timedelta | None=None
    ):
        until = until if until else datetime.timedelta(days=365)
        start = start if start else datetime.datetime.utcnow().astimezone()

        final_dict = {}
        for event in events:
            data = self._generate_data_single(event)
            utils.dict_merge(final_dict, data)
        final_dict = self._fill_empty(
            final_dict,
            start=start,
            until=until,
        )
        return final_dict

    def post_events(self, events):
        metadata = self.calendar_meadata.to_dict()
        data = self._generate_data(events)
        update_request = self.session.post(
            f'{self.base_url}/wp-admin/admin-ajax.php',
            auth=(self.credentials['user'], self.credentials['password']),
            data={
                'action': 'wpbs_save_calendar_data',
                'form_data': urllib.parse.urlencode(metadata),
                'calendar_data': json.dumps(data),
            },
        )
        return update_request