/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
angular.module('dashboard')

/** Provides widgets/directive related helper functions */
  .factory('helper', ['$filter', '$echarts', function ($filter, $echarts) {
    'use strict';

    return {
      /* Allows dashing property `<button>` to have a "Copy to clipboard" feature on click. */
      withClickToCopy: function (values, text) {
        return angular.extend(values, {
          tooltip: 'Location: <b>' + text + '</b><div><small>click button to copy</small></div>',
          click: function () {
            clipboard.copy(text);
          }
        });
      },
      /* Returns a readable duration component. */
      readableDuration: function (millis) {
        var pieces = $filter('duration')(millis).split(' ');
        return {
          value: Math.max(0, pieces[0]),
          unit: pieces.length > 1 ? pieces[1] : ''
        };
      },
      /* Return a readable metric value. */
      readableMetricValue: function (value) {
        if (angular.isNumber(value)) {
          var precision = Math.abs(value) < 100 ? 2 : 0;
          return $filter('number')(value, precision);
        }
        return value;
      },
      /* Make metric precision consistent */
      metricRounded: function (value) {
        return _.round(value, 2);
      },
      /* Create a proper chart time label for echart */
      timeToChartTimeLabel: function (time, shortForm) {
        return moment(time).format(shortForm ? 'HH:mm:ss' : 'ddd DD, HH:mm');
      },
      /* Return a y-axis label formatter that will not show 0 on y-axis */
      yAxisLabelFormatterWithoutValue0: function (unit) {
        return $echarts.axisLabelFormatter(unit, {0: ''});
      }
    };
  }])

  .filter('metric', ['helper', function (helper) {
    'use strict';

    return function (value) {
      return helper.readableMetricValue(value);
    };
  }])
;