/** @scratch /panels/5
 * include::panels/histogram.asciidoc[]
 */

/** @scratch /panels/histogram/0
 * == Histogram
 * Status: *Stable*
 *
 * The histogram panel allow for the display of time charts. It includes several modes and tranformations
 * to display event counts, mean, min, max and total of numeric fields, and derivatives of counter
 * fields.
 *
 */
define([
  'angular',
  'app',
  'jquery',
  'lodash',
  'kbn',
  'moment',
  './timeSeries',
  'services/panelSrv',
  'services/annotationsSrv',
  'services/datasourceSrv',
  'jquery.flot',
  'jquery.flot.events',
  'jquery.flot.selection',
  'jquery.flot.time',
  'jquery.flot.stack',
  'jquery.flot.stackpercent'
],
function (angular, app, $, _, kbn, moment, timeSeries) {

  'use strict';

  var module = angular.module('grafana.panels.graph', []);
  app.useModule(module);

  module.controller('GraphCtrl', function($scope, $rootScope, $timeout, panelSrv, annotationsSrv) {

    $scope.panelMeta = {
      modals : [],
      editorTabs: [],
      fullEditorTabs : [
        {
          title: 'General',
          src:'app/partials/panelgeneral.html'
        },
        {
          title: 'Metrics',
          src:'app/partials/metrics.html'
        },
        {
          title:'Axes & Grid',
          src:'app/panels/graph/axisEditor.html'
        },
        {
          title:'Display Styles',
          src:'app/panels/graph/styleEditor.html'
        }
      ],
      fullscreenEdit: true,
      fullscreenView: true,
      description : "Graphing"
    };

    // Set and populate defaults
    var _d = {

      datasource: null,

      /** @scratch /panels/histogram/3
       * renderer:: sets client side (flot) or native graphite png renderer (png)
       */
      renderer: 'flot',
      /** @scratch /panels/histogram/3
       * x-axis:: Show the x-axis
       */
      'x-axis'      : true,
      /** @scratch /panels/histogram/3
       * y-axis:: Show the y-axis
       */
      'y-axis'      : true,
      /** @scratch /panels/histogram/3
       * scale:: Scale the y-axis by this factor
       */
      scale         : 1,
      /** @scratch /panels/histogram/3
       * y_formats :: 'none','bytes','bits','bps','short', 's', 'ms'
       */
      y_formats    : ['short', 'short'],
      /** @scratch /panels/histogram/5
       * grid object:: Min and max y-axis values
       * grid.min::: Minimum y-axis value
       * grid.ma1::: Maximum y-axis value
       */
      grid          : {
        leftMax: null,
        rightMax: null,
        leftMin: null,
        rightMin: null,
        threshold1: null,
        threshold2: null,
        threshold1Color: 'rgba(216, 200, 27, 0.27)',
        threshold2Color: 'rgba(234, 112, 112, 0.22)'
      },

      annotate      : {
        enable      : false,
      },

      /** @scratch /panels/histogram/3
       * resolution:: If auto_int is true, shoot for this many bars.
       */
      resolution    : 100,

      /** @scratch /panels/histogram/3
       * ==== Drawing options
       * lines:: Show line chart
       */
      lines         : true,
      /** @scratch /panels/histogram/3
       * fill:: Area fill factor for line charts, 1-10
       */
      fill          : 0,
      /** @scratch /panels/histogram/3
       * linewidth:: Weight of lines in pixels
       */
      linewidth     : 1,
      /** @scratch /panels/histogram/3
       * points:: Show points on chart
       */
      points        : false,
      /** @scratch /panels/histogram/3
       * pointradius:: Size of points in pixels
       */
      pointradius   : 5,
      /** @scratch /panels/histogram/3
       * bars:: Show bars on chart
       */
      bars          : false,
      /** @scratch /panels/histogram/3
       * stack:: Stack multiple series
       */
      stack         : false,
      /** @scratch /panels/histogram/3
       * legend:: Display the legend
       */
      legend: {
        show: true, // disable/enable legend
        values: false, // disable/enable legend values
        min: false,
        max: false,
        current: false,
        total: false,
        avg: false
      },
      /** @scratch /panels/histogram/3
       * ==== Transformations
      /** @scratch /panels/histogram/3
       * percentage:: Show the y-axis as a percentage of the axis total. Only makes sense for multiple
       * queries
       */
      percentage    : false,
      /** @scratch /panels/histogram/3
       * zerofill:: Improves the accuracy of line charts at a small performance cost.
       */
      zerofill      : true,

      nullPointMode : 'connected',

      steppedLine: false,

      tooltip       : {
        value_type: 'cumulative',
        query_as_alias: true
      },

      targets: [{}],

      aliasColors: {},
      aliasYAxis: {},

      seriesOverrides: [],
    };

    _.defaults($scope.panel,_d);
    _.defaults($scope.panel.tooltip, _d.tooltip);
    _.defaults($scope.panel.annotate, _d.annotate);
    _.defaults($scope.panel.grid, _d.grid);
    _.defaults($scope.panel.legend, _d.legend);

    $scope.hiddenSeries = {};

    $scope.updateTimeRange = function () {
      $scope.range = $scope.filter.timeRange();
      $scope.rangeUnparsed = $scope.filter.timeRange(false);
      $scope.resolution = Math.ceil($(window).width() * ($scope.panel.span / 12));
      $scope.interval = '10m';

      if ($scope.range) {
        $scope.interval = kbn.secondsToHms(
          kbn.calculate_interval($scope.range.from, $scope.range.to, $scope.resolution, 0) / 1000
        );
      }
    };

    $scope.get_data = function() {
      $scope.updateTimeRange();

      var metricsQuery = {
        range: $scope.rangeUnparsed,
        interval: $scope.interval,
        targets: $scope.panel.targets,
        format: $scope.panel.renderer === 'png' ? 'png' : 'json',
        maxDataPoints: $scope.resolution,
        cacheTimeout: $scope.panel.cacheTimeout
      };

      $scope.annotationsPromise = annotationsSrv.getAnnotations($scope.filter, $scope.rangeUnparsed, $scope.dashboard);

      return $scope.datasource.query($scope.filter, metricsQuery)
        .then($scope.dataHandler)
        .then(null, function(err) {
          $scope.panelMeta.loading = false;
          $scope.panel.error = err.message || "Timeseries data request error";
          $scope.inspector.error = err;
          $scope.render([]);
        });
    };

    $scope.dataHandler = function(results) {
      $scope.panelMeta.loading = false;
      $scope.legend = [];

      // png renderer returns just a url
      if (_.isString(results)) {
        $scope.render(results);
        return;
      }

      $scope.datapointsWarning = false;
      $scope.datapointsCount = 0;
      $scope.datapointsOutside = false;

      var data = _.map(results.data, $scope.seriesHandler);

      $scope.datapointsWarning = $scope.datapointsCount === 0 || $scope.datapointsOutside;

      $scope.annotationsPromise
        .then(function(annotations) {
          data.annotations = annotations;
          $scope.render(data);
        }, function() {
          $scope.render(data);
        });
    };

    $scope.seriesHandler = function(seriesData, index) {
      var datapoints = seriesData.datapoints;
      var alias = seriesData.target;
      var color = $scope.panel.aliasColors[alias] || $rootScope.colors[index];
      var yaxis = $scope.panel.aliasYAxis[alias] || 1;

      var seriesInfo = {
        alias: alias,
        color:  color,
        enable: true,
        yaxis: yaxis
      };

      $scope.legend.push(seriesInfo);

      var series = new timeSeries.ZeroFilled({
        datapoints: datapoints,
        info: seriesInfo,
      });

      if (datapoints && datapoints.length > 0) {
        var last = moment.utc(datapoints[datapoints.length - 1][1] * 1000);
        var from = moment.utc($scope.range.from);
        if (last - from < -10000) {
          $scope.datapointsOutside = true;
        }

        $scope.datapointsCount += datapoints.length;
      }

      return series;
    };

    $scope.render = function(data) {
      $scope.$emit('render', data);
    };

    $scope.changeSeriesColor = function(series, color) {
      series.color = color;
      $scope.panel.aliasColors[series.alias] = series.color;
      $scope.render();
    };

    $scope.toggleSeries = function(serie, event) {
      if ($scope.hiddenSeries[serie.alias]) {
        delete $scope.hiddenSeries[serie.alias];
      }
      else {
        $scope.hiddenSeries[serie.alias] = true;
      }

      if (event.ctrlKey || event.metaKey || event.shiftKey) {
        $scope.toggleSeriesExclusiveMode(serie);
      }

      $scope.$emit('toggleLegend', $scope.legend);
    };

    $scope.toggleSeriesExclusiveMode = function(serie) {
      var hidden = $scope.hiddenSeries;

      if (hidden[serie.alias]) {
        delete hidden[serie.alias];
      }

      // check if every other series is hidden
      var alreadyExclusive = _.every($scope.legend, function(value) {
        if (value.alias === serie.alias) {
          return true;
        }

        return hidden[value.alias];
      });

      if (alreadyExclusive) {
        // remove all hidden series
        _.each($scope.legend, function(value) {
          delete $scope.hiddenSeries[value.alias];
        });
      }
      else {
        // hide all but this serie
        _.each($scope.legend, function(value) {
          if (value.alias === serie.alias) {
            return;
          }

          $scope.hiddenSeries[value.alias] = true;
        });
      }
    };

    $scope.toggleYAxis = function(info) {
      info.yaxis = info.yaxis === 2 ? 1 : 2;
      $scope.panel.aliasYAxis[info.alias] = info.yaxis;
      $scope.render();
    };

    $scope.toggleGridMinMax = function(key) {
      $scope.panel.grid[key] = _.toggle($scope.panel.grid[key], null, 0);
      $scope.render();
    };

    $scope.addSeriesOverride = function() {
      $scope.panel.seriesOverrides.push({});
    };

    panelSrv.init($scope);
  });

  angular
    .module('grafana.directives')
    .directive('seriesOverrideOption', function($compile) {
      var template =
          '<div class="dropdown"> ' +
             '<a  class="dropdown-toggle" gf-dropdown="options" data-toggle="dropdown">' +
                '<i class="icon-minus"></i></a>' +
          '</div>';

      return {
        scope: true,
        link: function($scope, elem, attrs) {
          var $template = $(template);
          elem.append($template);
          var $link = $(elem).find('a');

          $scope.options = $scope.$eval(attrs.options);
          $scope.options.unshift(null);

          $scope.options = _.map($scope.options, function(option, index) {
            return {
              text: option === null ? '<i class="icon-minus"></i>' : String(option),
              value: option,
              click: 'setValue(' + index + ')'
            };
          });

          $scope.setValue = function(index) {
            var value = $scope.options[index].value;
            if (value === null) {
              $link.html('<i class="icon-minus"></i>');
            }
            else {
              $link.html(value);
            }
          };

          $compile(elem.contents())($scope);
        }
      };
    });

});