# Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1.  Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
# 2.  Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import datetime
import itertools

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

from model.patchlog import PatchLog
from model.queues import Queue
from model.queuestatus import QueueStatus

# Fall back to simplejson, because we are still on Python 2.5.
try:
    import json
except ImportError:
    import simplejson as json


class QueueStatusJSON(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:
            patchStatusQuery = QueueStatus.all().filter('queue_name =', queue.name()).filter('active_patch_id =', item_id).order('-date')
            statuses = patchStatusQuery.fetch(1)
            message = None
            message_time = None
            bug_id = None
            results_url = None
            if statuses:
                message = statuses[0].message
                message_time = statuses[0].date
                bug_id = statuses[0].active_bug_id
                results_url = self.request.host_url + "/results/" + str(statuses[0].key().id()) if statuses[0].results_file else None

            row = {
                "attachment_id": item_id,
                "bug_id": bug_id,
                "active": active_items and active_items.time_for_item(item_id) != None,
                "active_since": active_items and active_items.time_for_item(item_id),
                "latest_message": message,
                "latest_message_time": message_time,
                "status_page": self.request.host_url + "/patch/" + str(item_id),
                "latest_results": results_url,
            }

            patch_log = PatchLog.lookup_if_exists(item_id, queue.name())
            if patch_log and patch_log.retry_count:
                row["retry_count"] = patch_log.retry_count

            rows.append(row)
        return rows

    def _bots(self, queue):
        # First, collect all bots that ever served this queue.
        bot_id_statuses = QueueStatus.all(projection=['bot_id'], distinct=True).filter('queue_name =', queue.name()).order('-date').fetch(500)
        bot_ids = list(entry.bot_id for entry in bot_id_statuses)
        result = []
        for bot_id in bot_ids:
            status = QueueStatus.all().filter('bot_id =', bot_id).order('-date').get()

            if status.queue_name != queue.name():
                # The bot got re-purposed, and is serving a different queue now.
                continue

            result.append({
                "bot_id": bot_id,
                "status_page": self.request.host_url + "/queue-status/" + queue.name() + "/bots/" + bot_id,
                "latest_message": status.message,
                "latest_message_time": status.date,
                "latest_message_bug_id": status.active_bug_id,
                "latest_message_patch_id": status.active_patch_id,
                "latest_output": self.request.host_url + "/results/" + str(status.key().id()) if status.results_file else None,
            })
        return result

    def get(self, queue_name):
        self.response.headers["Access-Control-Allow-Origin"] = "*"

        queue_name = queue_name.lower()
        queue = Queue.queue_with_name(queue_name)
        if not queue:
            self.error(404)
            return

        self.response.headers['Content-Type'] = 'application/json'

        status = {
            "status_page": self.request.host_url + "/queue-status/" + queue_name,
            "charts_page": self.request.host_url + "/queue-charts/" + queue_name,
            "queue": self._rows_for_work_items(queue),
            "bots": self._bots(queue),
        }
        dthandler = lambda obj: obj.isoformat() + "Z" if isinstance(obj, datetime.datetime) or isinstance(obj, datetime.date) else None
        self.response.out.write(json.dumps(status, default=dthandler))