///<reference path="../../headers/common.d.ts" />

import angular from 'angular';
import _ from 'lodash';
import $ from 'jquery';
import kbn from 'app/core/utils/kbn';
import coreModule from 'app/core/core_module';
import appEvents from 'app/core/app_events';
import {IntervalVariable} from './interval_variable';
import {Variable} from './variable';

export var variableConstructorMap: any = {};

export class VariableSrv {
  dashboard: any;
  variables: any;

  variableLock: any;

  /** @ngInject */
  constructor(
    private $rootScope,
    private $q,
    private $location,
    private $injector,
    private templateSrv) {
    }

    init(dashboard) {
      this.variableLock = {};
      this.dashboard = dashboard;
      this.variables = [];

      dashboard.templating.list.map(this.addVariable.bind(this));
      this.templateSrv.init(this.variables);

      return this.$q.when();
    }

    addVariable(model) {
      var ctor = variableConstructorMap[model.type];
      if (!ctor) {
        throw "Unable to find variable constructor for " + model.type;
      }

      var variable = this.$injector.instantiate(ctor, {model: model});
      this.variables.push(variable);
      this.dashboard.templating.list.push(model);

      return variable;
    }

    updateOptions(variable) {
      return variable.updateOptions();
    }

    variableUpdated(variable) {
      // if there is a variable lock ignore cascading update because we are in a boot up scenario
      if (this.variableLock[variable.name]) {
        return this.$q.when();
      }

      var promises = _.map(this.variables, otherVariable => {
        if (otherVariable === variable) {
          return;
        }

        if (this.templateSrv.containsVariable(otherVariable.regex, variable.name) ||
            this.templateSrv.containsVariable(otherVariable.query, variable.name) ||
              this.templateSrv.containsVariable(otherVariable.datasource, variable.name)) {
          return this.updateOptions(otherVariable);
        }
      });

      return this.$q.all(promises);
    }

    selectOptionsForCurrentValue(variable) {
      var i, y, value, option;
      var selected: any = [];

      for (i = 0; i < variable.options.length; i++) {
        option = variable.options[i];
        option.selected = false;
        if (_.isArray(variable.current.value)) {
          for (y = 0; y < variable.current.value.length; y++) {
            value = variable.current.value[y];
            if (option.value === value) {
              option.selected = true;
              selected.push(option);
            }
          }
        } else if (option.value === variable.current.value) {
          option.selected = true;
          selected.push(option);
        }
      }

      return selected;
    }

    validateVariableSelectionState(variable) {
      if (!variable.current) {
        if (!variable.options.length) { return Promise.resolve(); }
        return variable.setValue(variable.options[0]);
      }

      if (_.isArray(variable.current.value)) {
        var selected = this.selectOptionsForCurrentValue(variable);

        // if none pick first
        if (selected.length === 0) {
          selected = variable.options[0];
        } else {
          selected = {
            value: _.map(selected, function(val) {return val.value;}),
            text: _.map(selected, function(val) {return val.text;}).join(' + '),
          };
        }

        return variable.setValue(selected);
      } else {
        var currentOption = _.find(variable.options, {text: variable.current.text});
        if (currentOption) {
          return variable.setValue(currentOption);
        } else {
          if (!variable.options.length) { return Promise.resolve(); }
          return variable.setValue(variable.options[0]);
        }
      }
    }
}

coreModule.service('variableSrv', VariableSrv);