'use strict';

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

var BaseElementFactory = require('diagram-js/lib/core/ElementFactory'),
    LabelUtil = require('../../util/Label');


/**
 * A bpmn-aware factory for diagram-js shapes
 */
function ElementFactory(bpmnFactory) {
  BaseElementFactory.call(this);

  this._bpmnFactory = bpmnFactory;
}

ElementFactory.prototype = Object.create(BaseElementFactory.prototype);

ElementFactory.$inject = [ 'bpmnFactory' ];

module.exports = ElementFactory;

ElementFactory.prototype.baseCreate = BaseElementFactory.prototype.create;

ElementFactory.prototype.create = function(elementType, attrs) {

  // no special magic for labels,
  // we assume their businessObjects have already been created
  // and wired via attrs
  if (elementType === 'label') {
    return this.baseCreate(elementType, assign({ type: 'label' }, LabelUtil.DEFAULT_LABEL_SIZE, attrs));
  }

  attrs = attrs || {};

  var businessObject = attrs.businessObject,
      size;

  if (!businessObject) {
    if (!attrs.type) {
      throw new Error('no shape type specified');
    }

    businessObject = this._bpmnFactory.create(attrs.type);
  }

  if (!businessObject.di) {
    if (elementType === 'connection') {
      businessObject.di = this._bpmnFactory.createDiEdge(businessObject, [], {
        id: businessObject.id + '_di'
      });
    } else {
      businessObject.di = this._bpmnFactory.createDiShape(businessObject, {}, {
        id: businessObject.id + '_di'
      });
    }
  }

 if (!!attrs.isExpanded) {
   businessObject.di.isExpanded = attrs.isExpanded;
 }

 size = this._getDefaultSize(businessObject);

  attrs = assign({
    businessObject: businessObject,
    id: businessObject.id
  }, size, attrs);

  return this.baseCreate(elementType, attrs);
};


ElementFactory.prototype._getDefaultSize = function(semantic) {

  if (semantic.$instanceOf('bpmn:SubProcess')) {
    var isExpanded = semantic.di.isExpanded === true;

    if (isExpanded) {
      return { width: 350, height: 200 };
    } else {
      return { width: 100, height: 80 };
    }
  }

  if (semantic.$instanceOf('bpmn:Task')) {
    return { width: 100, height: 80 };
  }

  if (semantic.$instanceOf('bpmn:Gateway')) {
    return { width: 50, height: 50 };
  }

  if (semantic.$instanceOf('bpmn:Event')) {
    return { width: 36, height: 36 };
  }

  return { width: 100, height: 80 };
};