# Copyright (C) 2010 Google Inc. All rights reserved.
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import datetime
import itertools

from google.appengine.ext import webapp
from google.appengine.ext.webapp import template

from model.queues import Queue
from model import queuestatus


class QueueStatus(webapp.RequestHandler):
    def _rows_for_work_items(self, queue):
        queued_items = queue.work_items()
        active_items = queue.active_work_items()
        if not queued_items:
            return []
        rows = []
        for item_id in queued_items.item_ids:
            rows.append({
                "attachment_id": item_id,
                "bug_id": 1,
                "lock_time": active_items and active_items.time_for_item(item_id),
            })
        return rows

    def _grouping_key_for_status(self, status):
        return "%s-%s" % (status.active_patch_id, status.bot_id)

    def _build_status_groups(self, statuses):
        return [list(group) for key, group in itertools.groupby(statuses, self._grouping_key_for_status)]

    def _fetch_statuses(self, queue, bot_id):
        statuses = queuestatus.QueueStatus.all()
        statuses.filter("queue_name =", queue.name())
        if bot_id:
            statuses.filter("bot_id =", bot_id)
        return statuses.order("-date").fetch(50)

    def _fetch_last_message_matching(self, queue, bot_id, message):
        statuses = queuestatus.QueueStatus.all()
        statuses.filter("queue_name =", queue.name())
        if bot_id:
            statuses.filter("bot_id =", bot_id)
        statuses.filter("message =", message)
        return statuses.order("-date").get()

    def _fetch_trailing_days_pass_count(self, queue, bot_id, days):
        statuses = queuestatus.QueueStatus.all()
        statuses.filter("queue_name =", queue.name())
        days_ago = datetime.datetime.now() - datetime.timedelta(days=days)
        statuses.filter("date >", days_ago)
        if bot_id:
            statuses.filter("bot_id =", bot_id)
        statuses.filter("message =", "Pass")
        return statuses.count()

    def _fetch_trailing_days_pass_count_string(self, queue, bot_id, days):
        status_count = self._fetch_trailing_days_pass_count(queue, bot_id, days)
        # GQL has a result limit of 1000, so we return a special string to indicate we hit that limit.
        if status_count == 1000:
            status_count = "1000+"
        return str(status_count)

    def _page_title(self, queue, bot_id):
        title = "%s Messages" % queue.display_name()
        if bot_id:
            title += " from \"%s\"" % (bot_id)
        return title

    def get(self, queue_name, bot_id=None):
        queue_name = queue_name.lower()
        queue = Queue.queue_with_name(queue_name)
        if not queue:
            self.error(404)
            return

        statuses = self._fetch_statuses(queue, bot_id)
        template_values = {
            "queue_name": queue_name,
            "page_title": self._page_title(queue, bot_id),
            "work_item_rows": self._rows_for_work_items(queue),
            "status_groups": self._build_status_groups(statuses),
            "bot_id": bot_id,
            "last_pass": self._fetch_last_message_matching(queue, bot_id, "Pass"),
            "last_boot": self._fetch_last_message_matching(queue, bot_id, "Starting Queue"),
            "trailing_month_pass_count": self._fetch_trailing_days_pass_count_string(queue, bot_id, 30),
            "trailing_week_pass_count": self._fetch_trailing_days_pass_count_string(queue, bot_id, 7),
        }
        self.response.out.write(template.render("templates/queuestatus.html", template_values))