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

// Reserved attributes names
const reserved = {
  type: "type",
  specversion: "specversion",
  source: "source",
  id: "id",
  time: "time",
  schemaurl: "schemaurl",
  contenttype: "contenttype",
  data: "data"
};

const schema = require("../../ext/spec_0_2.json");

const ajv = new Ajv({
  // validate all keywords in the schemas with $ref
  extendRefs: true
});

const validate = ajv.compile(schema);

function Spec02() {
  this.payload = {
    specversion: "0.2",
    id: uuid()
  };
}

/*
 * Check the spec constraints
 */
Spec02.prototype.check = function(ce) {
  var toCheck = ce;
  if (!toCheck) {
    toCheck = this.payload;
  }
  const valid = validate(toCheck);

  if (!valid) {
    const err = new TypeError("invalid payload");
    err.errors = validate.errors;
    throw err;
  }
};

Spec02.prototype.type = function(_type) {
  this.payload.type = _type;
  return this;
};

Spec02.prototype.getType = function() {
  return this.payload.type;
};

Spec02.prototype.specversion = function() {
  // does not set! This is right
  return this;
};

Spec02.prototype.getSpecversion = function() {
  return this.payload.specversion;
};

Spec02.prototype.source = function(_source) {
  this.payload.source = _source;
  return this;
};

Spec02.prototype.getSource = function() {
  return this.payload.source;
};

Spec02.prototype.id = function(_id) {
  this.payload.id = _id;
  return this;
};

Spec02.prototype.getId = function() {
  return this.payload.id;
};

Spec02.prototype.time = function(_time) {
  this.payload.time = _time.toISOString();
  return this;
};

Spec02.prototype.getTime = function() {
  return this.payload.time;
};

Spec02.prototype.schemaurl = function(_schemaurl) {
  this.payload.schemaurl = _schemaurl;
  return this;
};

Spec02.prototype.getSchemaurl = function() {
  return this.payload.schemaurl;
};

Spec02.prototype.contenttype = function(_contenttype) {
  this.payload.contenttype = _contenttype;
  return this;
};

Spec02.prototype.getContenttype = function() {
  return this.payload.contenttype;
};

Spec02.prototype.data = function(_data) {
  this.payload.data = _data;
  return this;
};

Spec02.prototype.getData = function() {
  return this.payload.data;
};

Spec02.prototype.addExtension = function(key, value) {
  if (!Object.prototype.hasOwnProperty.call(reserved, key)) {
    this.payload[key] = value;
  } else {
    throw new TypeError(`Reserved attribute name: '${key}'`);
  }
  return this;
};

module.exports = Spec02;