'use strict';

var inherits = require('inherits');

var CommandInterceptor = require('diagram-js/lib/command/CommandInterceptor');

/**
 * BPMN specific remove behavior
 */
function RemoveBehavior(eventBus, modeling) {

  CommandInterceptor.call(this, eventBus);


  /**
   * morph collaboration diagram into process diagram
   * after the last participant has been removed
   */

  this.preExecute('shape.delete', function(context) {

    var shape = context.shape,
        parent = shape.parent;

    // activate the behavior if the shape to be removed
    // is a participant
    if (shape.businessObject.$instanceOf('bpmn:Participant')) {
      context.collaborationRoot = parent;
    }
  }, true);

  this.postExecute('shape.delete', function(context) {

    var collaborationRoot = context.collaborationRoot;

    if (collaborationRoot && collaborationRoot.businessObject.participants.length < 2) {
      // replace empty collaboration with process diagram
      modeling.makeProcess();
    }
  }, true);

}

RemoveBehavior.$inject = [ 'eventBus', 'modeling' ];

inherits(RemoveBehavior, CommandInterceptor);

module.exports = RemoveBehavior;