# Copyright (C) 2013 Google Inc. All rights reserved.
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import calendar
from datetime import datetime
import itertools
from time import time

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

from config import logging, charts
from model.patchlog import PatchLog
from model.queues import Queue
from model.queuelog import QueueLog


class QueueCharts(webapp.RequestHandler):
    def get(self, queue_name):
        queue_name = queue_name.lower()
        if not Queue.queue_with_name(queue_name):
            self.error(404)
            return

        timestamp = self._get_timestamp()
        view_range = self._get_view_range()
        time_unit, time_unit_name = charts.get_time_unit(view_range)

        all_queue_names = map(Queue.name, Queue.all())

        template_values = {
            "all_queue_names": all_queue_names,
            "patch_data": self._get_patch_data(queue_name, timestamp, view_range),
            "queue_data": self._get_queue_data(queue_name, timestamp, view_range),
            "queue_name": queue_name,
            "seconds_ago_min": 0,
            "seconds_ago_max": view_range,
            "time_unit_name": time_unit_name,
            "time_unit": time_unit,
            "timestamp": timestamp,
            "view_range": view_range,
            "view_range_choices": charts.view_range_choices,
        }
        self.response.out.write(template.render("templates/queuecharts.html", template_values))

    @classmethod
    def _get_min_med_max(cls, values, defaults=(0, 0, 0)):
        if not values:
            return defaults
        length = len(values)
        sorted_values = sorted(values)
        return sorted_values[0], sorted_values[length / 2], sorted_values[length - 1]

    def _get_patch_data(self, queue_name, timestamp, view_range):
        patch_logs = self._get_patch_logs(queue_name, timestamp, view_range)
        patch_data = []
        for patch_log in patch_logs:
            if patch_log.process_duration and patch_log.wait_duration:
                patch_log_timestamp = calendar.timegm(patch_log.date.utctimetuple())
                patch_data.append({
                    "attachment_id": patch_log.attachment_id,
                    "seconds_ago": timestamp - patch_log_timestamp,
                    "process_duration": patch_log.process_duration / charts.one_minute,
                    "retry_count": patch_log.retry_count,
                    "status_update_count": patch_log.status_update_count,
                    "wait_duration": patch_log.wait_duration / charts.one_minute,
               })
        return patch_data

    def _get_patch_logs(self, queue_name, timestamp, view_range):
        patch_log_query = PatchLog.all()
        patch_log_query = patch_log_query.filter("queue_name =", queue_name)
        patch_log_query = patch_log_query.filter("date >=", datetime.utcfromtimestamp(timestamp - view_range))
        patch_log_query = patch_log_query.filter("date <=", datetime.utcfromtimestamp(timestamp))
        patch_log_query = patch_log_query.order("date")
        return patch_log_query.run(limit=charts.patch_log_limit)

    def _get_queue_data(self, queue_name, timestamp, view_range):
        queue_logs = self._get_queue_logs(queue_name, timestamp, view_range)
        queue_data = []
        for queue_log in queue_logs:
            queue_log_timestamp = calendar.timegm(queue_log.date.utctimetuple())
            p_min, p_med, p_max = self._get_min_med_max(queue_log.patch_process_durations)
            w_min, w_med, w_max = self._get_min_med_max(queue_log.patch_wait_durations)
            queue_data.append({
                "bots_seen": len(queue_log.bot_ids_seen),
                "seconds_ago": timestamp - queue_log_timestamp,
                "patch_processing_min": p_min,
                "patch_processing_med": p_med,
                "patch_processing_max": p_max,
                "patch_retry_count": queue_log.patch_retry_count,
                "patch_waiting_min": w_min,
                "patch_waiting_med": w_med,
                "patch_waiting_max": w_max,
                "patches_completed": len(queue_log.patch_process_durations),
                "patches_waiting": queue_log.max_patches_waiting,
                "status_update_count": queue_log.status_update_count,
            })
        return queue_data

    def _get_queue_logs(self, queue_name, timestamp, view_range):
        queue_logs = []
        current_timestamp = timestamp - view_range
        while current_timestamp <= timestamp:
            queue_logs.append(QueueLog.get_at(queue_name, logging.queue_log_duration, current_timestamp))
            current_timestamp += logging.queue_log_duration
        return queue_logs

    @classmethod
    def _get_time_unit(cls, view_range):
        if view_range > charts.one_day * 2:
            return 

    def _get_timestamp(self):
        timestamp = self.request.get("timestamp")
        try:
            return int(timestamp)
        except ValueError:
            return int(time())

    def _get_view_range(self):
        view_range = self.request.get("view_range")
        try:
            return int(view_range)
        except ValueError:
            return charts.default_view_range