import re
from datetime import datetime, timezone

import ics
import requests

from db import Base
from sqlalchemy import Column, Integer, String, BigInteger


name_re = re.compile(r"([A-Z]+ [A-Z]+)")


def url(resources: int, project_id: int, first_date: datetime, last_date: datetime):
    first_date = first_date.strftime("%Y-%m-%d")
    last_date = last_date.strftime("%Y-%m-%d")
    return "http://adelb.univ-lyon1.fr/jsp/custom/modules/plannings/anonymous_cal.jsp?" \
           f"resources={resources}&projectId={project_id}&calType=ical&firstDate={first_date}&lastDate={last_date}"


class Calendar(Base):
    __tablename__ = "calendars"
    id = Column(Integer, primary_key=True)
    name = Column(String, nullable=False)
    resources = Column(Integer, nullable=False)
    project_id = Column(Integer, nullable=False)
    server = Column(BigInteger, nullable=False)

    def __init__(self, name: str, resources: int, project_id: int, server: int):
        self.name = name
        self.resources = resources
        self.project_id = project_id
        self.server = server

    def cal(self, first_date: datetime, last_date: datetime) -> ics.Calendar:
        return ics.Calendar(requests.get(url(self.resources, self.project_id, first_date, last_date)).text)

    def events(self, first_date: datetime, last_date: datetime) -> [ics.Event]:
        events = []
        for e in sorted(list(self.cal(first_date, last_date).events), key=lambda x: x.begin):
            e.begin = e.begin.replace(tzinfo=timezone.utc).astimezone(tz=None)
            e.end = e.begin.replace(tzinfo=timezone.utc).astimezone(tz=None)
            e.organizer = name_re.findall(e.description)[0]
            events.append(e)
        return events