// Copyright (c) 2012 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.

'use strict';

/**
 * @fileoverview ProfilingView glues the TimelineView control to
 * TracingController.
 */
base.requireStylesheet('profiling_view');
base.require('timeline_view');
base.require('tracing_controller');
base.exportTo('tracing', function() {
  /**
   * ProfilingView
   * @constructor
   * @extends {HTMLDivElement}
   */
  var ProfilingView = base.ui.define('div');

  ProfilingView.prototype = {
    __proto__: HTMLDivElement.prototype,

    traceEvents_: [],
    systemTraceEvents_: [],

    decorate: function() {
      this.classList.add('profiling-view');

      // make the <list>/add/save/record element
      this.recordBn_ = document.createElement('button');
      this.recordBn_.className = 'record';
      this.recordBn_.textContent = 'Record';
      this.recordBn_.addEventListener('click', this.onRecord_.bind(this));

      this.saveBn_ = document.createElement('button');
      this.saveBn_.textContent = 'Save';
      this.saveBn_.addEventListener('click', this.onSave_.bind(this));

      this.loadBn_ = document.createElement('button');
      this.loadBn_.textContent = 'Load';
      this.loadBn_.addEventListener('click', this.onLoad_.bind(this));

      this.systemTracingBn_ = document.createElement('input');
      this.systemTracingBn_.type = 'checkbox';
      this.systemTracingBn_.checked = false;

      this.systemTracingLabelEl_ = document.createElement('label');
      this.systemTracingLabelEl_.textContent = 'System events';
      this.systemTracingLabelEl_.appendChild(this.systemTracingBn_);
      this.systemTracingLabelEl_.style.display = 'none';
      this.systemTracingLabelEl_.style.marginLeft = '16px';

      this.timelineView_ = new tracing.TimelineView();
      this.timelineView_.leftControls.appendChild(this.recordBn_);
      this.timelineView_.leftControls.appendChild(this.saveBn_);
      this.timelineView_.leftControls.appendChild(this.loadBn_);
      this.timelineView_.leftControls.appendChild(this.systemTracingLabelEl_);

      this.appendChild(this.timelineView_);

      document.addEventListener('keypress', this.onKeypress_.bind(this));

      this.refresh_();
    },

    didSetTracingController_: function(value, oldValue) {
      if (oldValue)
        throw new Error('Can only set tracing controller once.');

      if (this.tracingController_.supportsSystemTracing) {
        this.systemTracingLabelEl_.style.display = 'block';
        this.systemTracingBn_.checked = true;
      } else {
        this.systemTracingLabelEl_.style.display = 'none';
      }

      this.refresh_();
    },

    refresh_: function() {
      if (!this.tracingController_)
        return;

      var traceEvents = this.tracingController_.traceEvents;
      var hasEvents = traceEvents && traceEvents.length;

      this.saveBn_.disabled = !hasEvents;

      if (!hasEvents) return;

      var traces = [traceEvents];
      if (this.tracingController_.systemTraceEvents.length)
        traces.push(this.tracingController_.systemTraceEvents);

      var m = new tracing.TimelineModel();
      m.importTraces(traces, true);
      this.timelineView_.model = m;
    },

    onKeypress_: function(event) {
      if (event.keyCode == 114 && !this.tracingController_.isTracingEnabled &&
          document.activeElement.nodeName != 'INPUT') {
        this.onRecord_();
      }
    },

    get timelineView() {
      return this.timelineView_;
    },

    ///////////////////////////////////////////////////////////////////////////

    onRecord_: function() {
      var that = this;
      var tc = this.tracingController_;
      tc.beginTracing(this.systemTracingBn_.checked);
      function response() {
        that.refresh_();
        setTimeout(function() {
          tc.removeEventListener('traceEnded', response);
        }, 0);
      }
      tc.addEventListener('traceEnded', response);
    },

    ///////////////////////////////////////////////////////////////////////////

    onSave_: function() {
      this.overlayEl_ = new tracing.Overlay();
      this.overlayEl_.className = 'profiling-overlay';

      var labelEl = document.createElement('div');
      labelEl.className = 'label';
      labelEl.textContent = 'Saving...';
      this.overlayEl_.appendChild(labelEl);
      this.overlayEl_.visible = true;

      var that = this;
      var tc = this.tracingController_;
      function response() {
        that.overlayEl_.visible = false;
        that.overlayEl_ = undefined;
        setTimeout(function() {
          tc.removeEventListener('saveTraceFileComplete', response);
          tc.removeEventListener('saveTraceFileCanceled', response);
        }, 0);
      }
      tc.addEventListener('saveTraceFileComplete', response);
      tc.addEventListener('saveTraceFileCanceled', response);
      tc.beginSaveTraceFile();
    },

    ///////////////////////////////////////////////////////////////////////////

    onLoad_: function() {
      this.overlayEl_ = new tracing.Overlay();
      this.overlayEl_.className = 'profiling-overlay';

      var labelEl = document.createElement('div');
      labelEl.className = 'label';
      labelEl.textContent = 'Loading...';
      this.overlayEl_.appendChild(labelEl);
      this.overlayEl_.visible = true;

      var that = this;
      var tc = this.tracingController_;
      this.tracingController_.beginLoadTraceFile();
      function response(e) {
        that.overlayEl_.visible = false;
        that.overlayEl_ = undefined;
        if (e.type == 'loadTraceFileComplete')
          that.refresh_();
        setTimeout(function() {
          tc.removeEventListener('loadTraceFileComplete', response);
          tc.removeEventListener('loadTraceFileCanceled', response);
        }, 0);
      }

      tc.addEventListener('loadTraceFileComplete', response);
      tc.addEventListener('loadTraceFileCanceled', response);
    }
  };

  base.defineProperty(ProfilingView, 'tracingController', base.PropertyKind.JS,
      ProfilingView.prototype.didSetTracingController_);

  return {
    ProfilingView: ProfilingView
  };
});