# -*- coding: utf-8 -*-
"""
Models for lecture recorder
"""
import json
import logging

from sqlalchemy import MetaData, CheckConstraint
from sqlalchemy.exc import IntegrityError

from datetime import datetime, timedelta

from backend import db, app, login_manager
from backend.tools.scrape_rooms import scrape_rooms

logger = logging.getLogger("lrc."+__name__)

metadata = MetaData()


class Room(db.Model):
    id = db.Column(db.Integer, autoincrement=True, primary_key=True)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.utcnow())
    name = db.Column(db.Unicode(127), unique=False, nullable=False)
    alternate_name = db.Column(db.Unicode(127), unique=False, nullable=True, default=None)
    comment = db.Column(db.Unicode(2047), unique=False, nullable=True, default="")
    number = db.Column(db.Unicode(63), unique=False, nullable=True)
    building_name = db.Column(db.Unicode(63), unique=False, nullable=True)
    building_number = db.Column(db.Unicode(63), unique=False, nullable=True)

    recorder = db.relationship('Recorder', uselist=False, back_populates='room')  # one-to-one relation (uselist=False)

    __table_args__ = (
        CheckConstraint('length(name) > 2',
                        name='name_min_length'),
    )

    def __init__(self, **kwargs):
        super(Room, self).__init__(**kwargs)

    @staticmethod
    def get_by_name(name):
        """
        Find group by name
        :param name:
        :return:
        """
        return Room.query.filter(Room.name == name).first()

    @staticmethod
    def get_by_building_number(building_number):
        """
        Find group by name
        :param name:
        :return:
        """
        return Room.query.filter(Room.building_number == building_number)

    @staticmethod
    def get_all():
        """
        Return all rooms
        :return:
        """
        return Room.query.all()

    def __str__(self):
        return self.name

    def to_dict(self):
        return dict(id=self.id, name=self.name)

    def toJSON(self):
        return json.dumps(self.to_dict(), default=lambda o: o.__dict__,
                          sort_keys=True, indent=4)


def pre_fill_table():
    rooms = scrape_rooms()
    logger.debug("tada")
    logger.debug("got {} rooms".format(len(rooms)))
    db_rooms = [Room(name=room['name'], number=room['room_number'],
                               building_name=room['building_name'], building_number=room['building_number']) for room in
                          rooms]

    try:
        db.session.bulk_save_objects(db_rooms)
        db.session.commit()
        logger.debug("rooms commited to DB!")
    except IntegrityError as e:
        logger.error("Could not add rooms! ({})".format(e))
        db.session.rollback()