import logging
import datetime
import pytz

from scheduler.asyncio import Scheduler

from settings import TIMEZONE, SCHEDULE_SYNC_INTERVAL
from orders import order_issue, order_check
from db.queries import orders_pool_by_id, orders_pool_scheduled, orders_pool_since, skip_day_contains, order_status_outstanding
from util import order_time, sqlite_time

logger = logging.getLogger(__name__)

WEEKDAYS = [0, 1, 2, 3, 4]
WEEKENDS = [5, 6]

GRACE_PERIOD = datetime.timedelta(seconds=10)

class OrderScheduler():
  def __init__(self, loop):
    self.tz = pytz.timezone(TIMEZONE)

    self.scheduler = Scheduler(loop=loop, tzinfo=self.tz)

    self.scheduled_pools = {}
    for orders_pool in orders_pool_scheduled():
      self.schedule_pool(orders_pool)

    for order_status in order_status_outstanding():
      self.scheduler.once(
        datetime.datetime.fromisoformat(order_status.due_at) + GRACE_PERIOD,
        self.scheduled_check,
        args=(order_status.id,)
      )

    self.last_update = datetime.datetime.now(datetime.UTC)
    self.scheduler.cyclic(
      datetime.timedelta(seconds=SCHEDULE_SYNC_INTERVAL),
      self.update_schedule
    )
    
    logger.info(self.scheduler)

  def schedule_pool(self, orders_pool):
    if orders_pool.id in self.scheduled_pools:
      self.scheduler.delete_job(self.scheduled_pools[orders_pool.id])
      del self.scheduled_pools[orders_pool.id]

    if orders_pool.scheduled:
      self.scheduled_pools[orders_pool.id] = self.scheduler.daily(
        [order_time(t) for t in orders_pool.time.split(",")],
        self.scheduled_order,
        args=(orders_pool.id,)
      )

  async def scheduled_order(self, orders_pool_id):
    orders_pool = orders_pool_by_id(orders_pool_id)

    # Skip weekends or weekdays
    day_of_week = datetime.datetime.now(tz=self.tz).weekday()
    if (
      (not orders_pool.weekends and day_of_week in WEEKENDS)
      or
      (not orders_pool.weekdays and day_of_week in WEEKDAYS)
    ):
      logger.info(f'{orders_pool.name}[{orders_pool.user.telegram_username}] Not scheduled for today')
      return

    # Skip stored dates
    today = datetime.datetime.now(tz=self.tz).strftime("%Y-%m-%d")
    logger.info('Today %s' % today)
    if (skip_day_contains(orders_pool.user, today)):
      logger.info('Today is a skip day')
      return
    
    logger.info(f'Issuing order for {orders_pool.name}[{orders_pool.user.telegram_username}]')

    order_status = await order_issue(orders_pool)

    if order_status is not None:
      # Schedule check
      self.scheduler.once(
        order_status.due_at + GRACE_PERIOD,
        self.scheduled_check,
        args=(order_status.id,)
      )

  async def scheduled_check(self, outstanding_order_id):
    await order_check(outstanding_order_id)

  async def update_schedule(self):
    last_update_sqlite = sqlite_time(self.last_update)

    updated = False
    
    for orders_pool_updated in orders_pool_since(last_update_sqlite):
      logger.info(f'Updating schedule for {orders_pool_updated}')
      self.schedule_pool(orders_pool_updated)
      updated = True

    if updated:
      logger.info(self.scheduler)

    self.last_update = datetime.datetime.now(datetime.UTC)