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from google.appengine.ext import db

from datetime import timedelta
import time


class ActiveWorkItems(db.Model):
    queue_name = db.StringProperty()
    item_ids = db.ListProperty(int)
    item_dates = db.ListProperty(float)
    date = db.DateTimeProperty(auto_now_add=True)

    def deactivate_expired(self, now):
        one_hour_ago = time.mktime((now - timedelta(minutes=60)).timetuple())
        nonexpired_item_ids = []
        nonexpired_item_dates = []
        for i in range(len(self.item_ids)):
            if self.item_dates[i] > one_hour_ago:
                nonexpired_item_ids.append(self.item_ids[i])
                nonexpired_item_dates.append(self.item_dates[i])
        self.item_ids = nonexpired_item_ids
        self.item_dates = nonexpired_item_dates

    def next_item(self, work_item_ids, now):
        for item_id in work_item_ids:
            if item_id not in self.item_ids:
                self.item_ids.append(item_id)
                self.item_dates.append(time.mktime(now.timetuple()))
                return item_id
        return None