import datetime
import os
import os.path
from pathlib import Path
from icalendar import Calendar
from webdav3.client import Client as WDClient


CACHE_DIR = "~/.cache/smallprint"


class Client:
    def __init__(self, config):
        """
        Initializes a client
        """
        options = {
            'webdav_hostname': config["WEBDAV_SERVER"],
            'webdav_login': config["WEBDAV_USER"],
            'webdav_password': config["WEBDAV_PASSWORD"],
        }
        self.calendar_path = config["CALENDAR_PATH"]
        self.client = WDClient(options)

        cache_path = Path(CACHE_DIR).expanduser()     # Generate the full path
        if not cache_path.is_dir():
            # Create the cache dir
            os.mkdir(cache_path)

        self.cache_path = cache_path

    def retrieve_calendars_list(self):
        """
        Retrieves the calendar list
        """
        paths = [path for path in self.client.list(self.calendar_path) if ".ics" in path]
        return paths

    def read_calendar(self, pathname):
        """
        Given a filename, tries to read the calendar event
        """
        cache_file = os.path.join(self.cache_path, pathname)

        if not os.path.exists(cache_file):
            print(f"Downloading {pathname}")
            # File not in cache, download
            rpath = os.path.join(self.calendar_path, pathname)
            self.client.download_sync(remote_path=rpath,
                                    local_path=cache_file)

        # Read the downloaded or cached data
        with open(cache_file, 'r') as fics:
            fics = open(cache_file, 'r')
            data = fics.read()

        # Now with the data read, we can process it
        return self.parse_calendar(data)

    def parse_calendar(self, data):
        """
        Parses ICS calendar data received
        """
        events = []
        now = datetime.datetime.now()
        start_day = datetime.datetime(now.year, now.month, now.day)
        tomorrow = start_day + datetime.timedelta(days=1)
        calendar = Calendar.from_ical(data)
        for component in calendar.walk():
            if component.name == 'VEVENT':
                event_date = component.decoded('dtstart')
                ed = datetime.datetime(event_date.year, event_date.month, event_date.day)
                if ed >= start_day and ed < tomorrow:
                    events.append((component.get('summary'),
                                   component.decoded('dtstart')))

        return events

    def get_todays_events(self):
        """
        Get todays events
        """
        calendars = self.retrieve_calendars_list()
        events = []
        for calendar in calendars:
            cal_events = self.read_calendar(calendar)
            for ev in cal_events:
                events.append(ev)

        return events