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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.queues import Queue


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

    def _should_add_to_ews_queue(self, queue, attachment):
        # This assert() is here to make sure we're not submitting to the commit-queue.
        # The commit-queue clients check each patch anyway, but there is no sense
        # in adding things to the commit-queue when they won't be processed by it.
        assert(queue.is_ews())
        latest_status = attachment.status_for_queue(queue)
        # The feeder queue only submits each patch once normally, but it loses its memory
        # when restarted. We do not want to re-add all patches if that happens.
        # In the future we might add a "force" button to allow the user to retry patches
        # that were previously submitted.
        return not latest_status

    def _add_attachment_to_ews_queues(self, attachment):
        for queue in Queue.all_ews():  # all_ews() currently includes the style-queue
            if self._should_add_to_ews_queue(queue, attachment):
                queue.work_items().add_work_item(attachment.id)
                RecordPatchEvent.added(attachment.id, queue.name())

    def post(self):
        attachment_id = self._int_from_request("attachment_id")
        attachment = Attachment(attachment_id)
        self._add_attachment_to_ews_queues(attachment)
        if self.request.get("next_action") == "return_to_bubbles":
            self.redirect("/status-bubble/%s" % attachment_id)