# Copyright (C) 2013 Google Inc. All rights reserved.
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from google.appengine.ext import webapp, db
from google.appengine.ext.webapp import template

from handlers.updatebase import UpdateBase
from loggers.recordpatchevent import RecordPatchEvent
from model.queues import Queue
from model.workitems import WorkItems

from datetime import datetime


class UpdateWorkItems(UpdateBase):
    def get(self):
        self.response.out.write(template.render("templates/updateworkitems.html", None))

    def _parse_work_items_string(self, items_string):
        try:
            item_strings = items_string.split(" ") if items_string else []
            return map(int, item_strings)
        except ValueError:
            return None

    def _update_work_items_from_request(self, work_items):
        items_string = self.request.get("work_items")
        new_work_items = self._parse_work_items_string(items_string)
        if new_work_items == None:
            self.response.out.write("Failed to parse work items: %s" % items_string)
            return False
        work_items.item_ids = new_work_items
        work_items.date = datetime.utcnow()
        return True

    def _queue_from_request(self):
        queue_name = self.request.get("queue_name")
        queue = Queue.queue_with_name(queue_name)
        if not queue:
            self.response.out.write("\"%s\" is not in queues %s" % (queue_name, Queue.all()))
            return None
        return queue

    def post(self):
        queue = self._queue_from_request()
        if not queue:
            self.response.set_status(500)
            return
        work_items = queue.work_items()
        old_items = set(work_items.item_ids)

        success = self._update_work_items_from_request(work_items)
        if not success:
            self.response.set_status(500)
            return
        new_items = set(work_items.item_ids)
        work_items.put()

        for work_item in new_items - old_items:
            RecordPatchEvent.added(work_item, queue.name())
        for work_item in old_items - new_items:
            RecordPatchEvent.stopped(work_item, queue.name())