# 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.attachment import Attachment
from model.attachmentdata import AttachmentData
from model.queues import Queue


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

    @staticmethod
    def _check_processed_by_all_queues(attachment):
        return all(attachment.position_in_queue(queue) is None for queue in Queue.all_ews())

    def post(self):
        queue_name = self.request.get("queue_name")
        # FIXME: This queue lookup should be shared between handlers.
        queue = Queue.queue_with_name(queue_name)
        if not queue:
            self.error(404)
            return

        attachment_id = self._int_from_request("attachment_id")
        attachment = Attachment(attachment_id)
        last_status = attachment.status_for_queue(queue)

        # Ideally we should use a transaction for the calls to
        # WorkItems and ActiveWorkItems.

        queue.work_items().remove_work_item(attachment_id)
        RecordPatchEvent.stopped(attachment_id, queue_name, last_status.message)

        queue.active_work_items().expire_item(attachment_id)

        if self._check_processed_by_all_queues(attachment):
            AttachmentData.remove_attachment_data(attachment_id)