const uuid = require("uuid/v4");

function Spec01(_caller) {
  this.payload = {
    cloudEventsVersion: "0.1",
    eventID: uuid()
  };

  /*
   * Used to inject backward compatibility functions or attributes.
   */
  this.caller = _caller;

  /*
   * Inject the method to set the version related to data attribute.
   */
  this.caller.prototype.eventTypeVersion = function(_version) {
    return this.spec.eventTypeVersion(_version);
  };

  this.caller.prototype.getEventTypeVersion = function() {
    return this.spec.getEventTypeVersion();
  };
}

/*
 * Check the constraints.
 *
 * throw an error if do not pass.
 */
Spec01.prototype.check = function() {
  if (!this.payload.eventType) {
    throw new TypeError("'eventType' is invalid");
  }
};

Spec01.prototype.type = function(_type) {
  this.payload.eventType = _type;
  return this;
};

Spec01.prototype.getType = function() {
  return this.payload.eventType;
};

Spec01.prototype.getSpecversion = function() {
  return this.payload.cloudEventsVersion;
};

Spec01.prototype.eventTypeVersion = function(version) {
  this.payload.eventTypeVersion = version;
  return this;
};

Spec01.prototype.getEventTypeVersion = function() {
  return this.payload.eventTypeVersion;
};

Spec01.prototype.source = function(_source) {
  this.payload.source = _source;
  return this;
};

Spec01.prototype.getSource = function() {
  return this.payload.source;
};

Spec01.prototype.id = function(_id) {
  this.payload.eventID = _id;
  return this;
};

Spec01.prototype.getId = function() {
  return this.payload.eventID;
};

Spec01.prototype.time = function(_time) {
  this.payload.eventTime = _time.toISOString();
  return this;
};

Spec01.prototype.getTime = function() {
  return this.payload.eventTime;
};

Spec01.prototype.schemaurl = function(_schemaurl) {
  this.payload.schemaURL = _schemaurl;
  return this;
};

Spec01.prototype.getSchemaurl = function() {
  return this.payload.schemaURL;
};

Spec01.prototype.contenttype = function(_contenttype) {
  this.payload.contentType = _contenttype;
  return this;
};

Spec01.prototype.getContenttype = function() {
  return this.payload.contentType;
};

Spec01.prototype.data = function(_data) {
  this.payload.data = _data;
  return this;
};

Spec01.prototype.getData = function() {
  return this.payload.data;
};

Spec01.prototype.addExtension = function(key, value) {
  if (!this.payload.extensions) {
    this.payload.extensions = {};
  }
  this.payload.extensions[key] = value;
  return this;
};

module.exports = Spec01;