<!DOCTYPE html>
<!--
Copyright (c) 2013 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<link rel="import" href="/base/base.html">
<link rel="import" href="/base/iteration_helpers.html">
<link rel="import" href="/base/statistics.html">

<script>
'use strict';
tr.exportTo('tr.c.analysis', function() {
  function MultiEventSummary(title, events) {
    this.title = title;
    this.duration_ = undefined;
    this.selfTime_ = undefined;
    this.events_ = events;

    this.cpuTimesComputed_ = false;
    this.cpuSelfTime_ = undefined;
    this.cpuDuration_ = undefined;

    this.untotallableArgs_ = [];
    this.totalledArgs_ = undefined;
  };
  MultiEventSummary.prototype = {
    get duration() {
      if (this.duration_ === undefined) {
        this.duration_ = tr.b.Statistics.sum(
            this.events_, function(event) {
                return event.duration;
            });
      }
      return this.duration_;
    },

    get cpuSelfTime() {
      this.computeCpuTimesIfNeeded_();
      return this.cpuSelfTime_;
    },

    get cpuDuration() {
      this.computeCpuTimesIfNeeded_();
      return this.cpuDuration_;
    },

    computeCpuTimesIfNeeded_: function() {
      if (this.cpuTimesComputed_)
        return;
      this.cpuTimesComputed_ = true;

      var cpuSelfTime = 0;
      var cpuDuration = 0;
      var hasCpuData = false;
      for (var i = 0; i < this.events_.length; i++) {
        var event = this.events_[i];
        if (event.cpuDuration !== undefined) {
          cpuDuration += event.cpuDuration;
          hasCpuData = true;
        }

        if (event.cpuSelfTime !== undefined) {
          cpuSelfTime += event.cpuSelfTime;
          hasCpuData = true;
        }
      }
      if (hasCpuData) {
        this.cpuDuration_ = cpuDuration;
        this.cpuSelfTime_ = cpuSelfTime;
      }
    },

    get selfTime() {
      if (this.selfTime_ === undefined) {
        this.selfTime_ = 0;
        for (var i = 0; i < this.events_.length; i++) {
          if (this.events_[i].selfTime !== undefined)
            this.selfTime_ += this.events[i].selfTime;
        }
      }
      return this.selfTime_;
    },

    get events() {
      return this.events_;
    },

    get numEvents() {
      return this.events_.length;
    },

    get numAlerts() {
      if (this.numAlerts_ === undefined) {
        this.numAlerts_ = tr.b.Statistics.sum(this.events_, function(event) {
          return event.associatedAlerts.length;
        });
      }
      return this.numAlerts_;
    },

    get untotallableArgs() {
      this.updateArgsIfNeeded_();
      return this.untotallableArgs_;
    },

    get totalledArgs() {
      this.updateArgsIfNeeded_();
      return this.totalledArgs_;
    },

    updateArgsIfNeeded_: function() {
      if (this.totalledArgs_ !== undefined)
        return;

      var untotallableArgs = {};
      var totalledArgs = {};
      for (var i = 0; i < this.events_.length; i++) {
        var event = this.events_[i];
        for (var argName in event.args) {
          var argVal = event.args[argName];
          var type = typeof argVal;
          if (type !== 'number') {
            untotallableArgs[argName] = true;
            delete totalledArgs[argName];
            continue;
          }
          if (untotallableArgs[argName]) {
            continue;
          }

          if (totalledArgs[argName] === undefined)
            totalledArgs[argName] = 0;
          totalledArgs[argName] += argVal;
        }
      }
      this.untotallableArgs_ = tr.b.dictionaryKeys(untotallableArgs);
      this.totalledArgs_ = totalledArgs;
    }
  };

  return {
    MultiEventSummary: MultiEventSummary
  };
});
</script>