/**
 * Grafana-Zabbix
 * Zabbix plugin for Grafana.
 * http://github.com/alexanderzobnin/grafana-zabbix
 *
 * Trigger panel.
 * This feature sponsored by CORE IT
 * http://www.coreit.fr
 *
 * Copyright 2015 Alexander Zobnin alexanderzobnin@gmail.com
 * Licensed under the Apache License, Version 2.0
 */

define([
  'app/plugins/sdk',
  'angular',
  'lodash',
  'jquery',
  'moment',
  './editor'
],
function (sdk, angular, _, $, moment, triggerPanelEditor) {
  'use strict';

  var defaultSeverity = [
    { priority: 0, severity: 'Not classified',  color: '#B7DBAB', show: true },
    { priority: 1, severity: 'Information',     color: '#82B5D8', show: true },
    { priority: 2, severity: 'Warning',         color: '#E5AC0E', show: true },
    { priority: 3, severity: 'Average',         color: '#C15C17', show: true },
    { priority: 4, severity: 'High',            color: '#BF1B00', show: true },
    { priority: 5, severity: 'Disaster',        color: '#890F02', show: true }
  ];

  var panelDefaults = {
    datasource: null,
    triggers: {
      group: {filter: ""},
      host: {filter: ""},
      application: {filter: ""},
      trigger: {filter: ""}
    },
    hostField: true,
    statusField: false,
    severityField: false,
    lastChangeField: true,
    ageField: true,
    infoField: true,
    limit: 10,
    showTriggers: 'all triggers',
    sortTriggersBy: { text: 'last change', value: 'lastchange' },
    showEvents: { text: 'Problem events', value: '1' },
    triggerSeverity: defaultSeverity,
    okEventColor: '#890F02',
  };

  var triggerStatusMap = {
    '0': 'OK',
    '1': 'Problem'
  };

  var TriggerPanelCtrl = (function(_super) {

    /** @ngInject */
    function TriggerPanelCtrl($scope, $injector, $q, $element, datasourceSrv) {
      _super.call(this, $scope, $injector);
      this.datasourceSrv = datasourceSrv;
      this.triggerStatusMap = triggerStatusMap;

      // Load panel defaults
      _.defaults(this.panel, panelDefaults);

      this.triggerList = [];
      this.refreshData();
    }

    TriggerPanelCtrl.templateUrl = 'module.html';

    TriggerPanelCtrl.prototype = Object.create(_super.prototype);
    TriggerPanelCtrl.prototype.constructor = TriggerPanelCtrl;

    // Add panel editor
    TriggerPanelCtrl.prototype.initEditMode = function() {
      _super.prototype.initEditMode();
      this.icon = "fa fa-lightbulb-o";
      this.addEditorTab('Options', triggerPanelEditor, 2);
    };

    TriggerPanelCtrl.prototype.refreshData = function() {
      var self = this;

      // Load datasource
      return this.datasourceSrv.get(this.panel.datasource).then(function (datasource) {
        var zabbix = datasource.zabbixAPI;
        var queryProcessor = datasource.queryProcessor;
        var triggerFilter = self.panel.triggers;
        var showEvents = self.panel.showEvents.value;
        var buildQuery = queryProcessor.buildTriggerQuery(triggerFilter.group.filter,
                                                          triggerFilter.host.filter,
                                                          triggerFilter.application.filter);
        return buildQuery.then(function(query) {
          return zabbix.getTriggers(query.groupids,
                                    query.hostids,
                                    query.applicationids,
                                    showEvents)
            .then(function(triggers) {
              return _.map(triggers, function (trigger) {
                var triggerObj = trigger;

                // Format last change and age
                trigger.lastchangeUnix = Number(trigger.lastchange);
                var timestamp = moment.unix(trigger.lastchangeUnix);
                if (self.panel.customLastChangeFormat) {
                  // User defined format
                  triggerObj.lastchange = timestamp.format(self.panel.lastChangeFormat);
                } else {
                  triggerObj.lastchange = timestamp.format(self.defaultTimeFormat);
                }
                triggerObj.age = timestamp.fromNow(true);

                // Set color
                if (trigger.value === '1') {
                  triggerObj.color = self.panel.triggerSeverity[trigger.priority].color;
                } else {
                  triggerObj.color = self.panel.okEventColor;
                }

                triggerObj.severity = self.panel.triggerSeverity[trigger.priority].severity;
                return triggerObj;
              });
            })
            .then(function (triggerList) {

              // Request acknowledges for trigger
              var eventids = _.map(triggerList, function(trigger) {
                return trigger.lastEvent.eventid;
              });

              return zabbix.getAcknowledges(eventids)
                .then(function (events) {

                  // Map events to triggers
                  _.each(triggerList, function(trigger) {
                    var event = _.find(events, function(event) {
                      return event.eventid === trigger.lastEvent.eventid;
                    });

                    if (event) {
                      trigger.acknowledges = _.map(event.acknowledges, function (ack) {
                        var time = new Date(+ack.clock * 1000);
                        ack.time = time.toLocaleString();
                        ack.user = ack.alias + ' (' + ack.name + ' ' + ack.surname + ')';
                        return ack;
                      });
                    }
                  });

                  // Filter triggers by description
                  var triggerFilter = self.panel.triggers.trigger.filter;
                  if (triggerFilter) {
                    triggerList = filterTriggers(triggerList, triggerFilter);
                  }

                  // Filter acknowledged triggers
                  if (self.panel.showTriggers === 'unacknowledged') {
                    triggerList = _.filter(triggerList, function (trigger) {
                      return !trigger.acknowledges;
                    });
                  } else if (self.panel.showTriggers === 'acknowledged') {
                    triggerList = _.filter(triggerList, 'acknowledges');
                  } else {
                    triggerList = triggerList;
                  }

                  // Filter triggers by severity
                  triggerList = _.filter(triggerList, function (trigger) {
                    return self.panel.triggerSeverity[trigger.priority].show;
                  });

                  // Sort triggers
                  if (self.panel.sortTriggersBy.value === 'priority') {
                    triggerList = _.sortBy(triggerList, 'priority').reverse();
                  } else {
                    triggerList = _.sortBy(triggerList, 'lastchangeUnix').reverse();
                  }

                  // Limit triggers number
                  self.triggerList  = _.first(triggerList, self.panel.limit);

                  self.renderingCompleted();
                });
            });
        });
      });
    };

    function filterTriggers(triggers, triggerFilter) {
      if (isRegex(triggerFilter)) {
        return _.filter(triggers, function(trigger) {
          return buildRegex(triggerFilter).test(trigger.description);
        });
      } else {
        return _.filter(triggers, function(trigger) {
          return trigger.description === triggerFilter;
        });
      }
    }

    function isRegex(str) {
      // Pattern for testing regex
      var regexPattern = /^\/(.*)\/([gmi]*)$/m;
      return regexPattern.test(str);
    }

    function buildRegex(str) {
      var regexPattern = /^\/(.*)\/([gmi]*)$/m;
      var matches = str.match(regexPattern);
      var pattern = matches[1];
      var flags = matches[2] !== "" ? matches[2] : undefined;
      return new RegExp(pattern, flags);
    }

    return TriggerPanelCtrl;

  })(sdk.PanelCtrl);

  return {
    PanelCtrl: TriggerPanelCtrl
  };

});