'use strict';

var assign = require('lodash/object/assign');


/**
 * A provider for BPMN 2.0 elements context pad
 */
function ContextPadProvider(contextPad, directEditing, modeling, selection, elementFactory, connect, create) {

  contextPad.registerProvider(this);

  this._directEditing = directEditing;

  this._modeling = modeling;
  this._selection = selection;

  this._elementFactory = elementFactory;
  this._connect = connect;
  this._create = create;
}

ContextPadProvider.$inject = [
  'contextPad',
  'directEditing',
  'modeling',
  'selection',
  'elementFactory',
  'connect',
  'create'
];

ContextPadProvider.prototype.getContextPadEntries = function(element) {

  var modeling = this._modeling,
      elementFactory = this._elementFactory,
      connect = this._connect,
      create = this._create;

  var actions = {};

  if (element.type === 'label') {
    return actions;
  }

  var bpmnElement = element.businessObject;

  function startConnect(event, element, autoActivate) {
    connect.start(event, element, autoActivate);
  }

  function appendAction(type, className) {

    function appendListener(event, element) {
      var shape = elementFactory.createShape({ type: type });
      create.start(event, shape, element);
    }

    return {
      group: 'model',
      className: className,
      action: {
        dragstart: appendListener,
        click: appendListener
      }
    };
  }

  if (bpmnElement.$instanceOf('bpmn:FlowNode')) {

    if (!bpmnElement.$instanceOf('bpmn:EndEvent')) {

      assign(actions, {
        'append.end-event': appendAction('bpmn:EndEvent', 'icon-end-event'),
        'append.gateway': appendAction('bpmn:ExclusiveGateway', 'icon-gateway'),
        'append.append-task': appendAction('bpmn:Task', 'icon-task'),
        'append.intermediate-event': appendAction('bpmn:IntermediateThrowEvent', 'icon-intermediate-event'),
        'connect': {
          group: 'connect',
          className: 'icon-connection',
          action: {
            click: startConnect,
            dragstart: startConnect
          }
        }
      });
    }

    assign(actions, {
      'append.text-annotation': appendAction('bpmn:TextAnnotation', 'icon-text-annotation')
    });
  }

  function removeElement(e) {
    if (element.waypoints) {
      modeling.removeConnection(element);
    } else {
      modeling.removeShape(element);
    }
  }

  assign(actions, {
    'delete': {
      group: 'edit',
      className: 'icon-trash',
      action: {
        click: removeElement,
        dragstart: removeElement
      }
    }
  });

  return actions;
};


module.exports = ContextPadProvider;