"use strict";

var some = require("min-dash").some;

var ALLOWED_TYPES = {
  FailedJobRetryTimeCycle: ["bpmn:StartEvent", "bpmn:BoundaryEvent", "bpmn:IntermediateCatchEvent", "bpmn:Activity"],
  Connector: ["bpmn:EndEvent", "bpmn:IntermediateThrowEvent"],
  Field: ["bpmn:EndEvent", "bpmn:IntermediateThrowEvent"]
};

function is(element, type) {
  return element && typeof element.$instanceOf === "function" && element.$instanceOf(type);
}

function exists(element) {
  return element && element.length;
}

function includesType(collection, type) {
  return (
    exists(collection) &&
    some(collection, function(element) {
      return is(element, type);
    })
  );
}

function anyType(element, types) {
  return some(types, function(type) {
    return is(element, type);
  });
}

function isAllowed(propName, propDescriptor, newElement) {
  var name = propDescriptor.name,
    types = ALLOWED_TYPES[name.replace(/flowable:/, "")];

  return name === propName && anyType(newElement, types);
}

function FlowableModdleExtension(eventBus) {
  eventBus.on(
    "property.clone",
    function(context) {
      var newElement = context.newElement,
        propDescriptor = context.propertyDescriptor;

      this.canCloneProperty(newElement, propDescriptor);
    },
    this
  );
}

FlowableModdleExtension.$inject = ["eventBus"];

FlowableModdleExtension.prototype.canCloneProperty = function(newElement, propDescriptor) {
  if (isAllowed("flowable:FailedJobRetryTimeCycle", propDescriptor, newElement)) {
    return (
      includesType(newElement.eventDefinitions, "bpmn:TimerEventDefinition") ||
      includesType(newElement.eventDefinitions, "bpmn:SignalEventDefinition") ||
      is(newElement.loopCharacteristics, "bpmn:MultiInstanceLoopCharacteristics")
    );
  }

  if (isAllowed("flowable:Connector", propDescriptor, newElement)) {
    return includesType(newElement.eventDefinitions, "bpmn:MessageEventDefinition");
  }

  if (isAllowed("flowable:Field", propDescriptor, newElement)) {
    return includesType(newElement.eventDefinitions, "bpmn:MessageEventDefinition");
  }
};

module.exports = FlowableModdleExtension;