/*!
 * Should
 * Copyright(c) 2010-2014 TJ Holowaychuk <tj@vision-media.ca>
 * MIT Licensed
 */

var util = require('../util');

module.exports = function(should, Assertion) {
  /**
   * Assert given object is number
   * @name Number
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('Number', function() {
    this.params = {operator: 'to be a number'};

    this.have.type('number');
  });

  /**
   * Assert given object is arguments
   * @name arguments
   * @alias Assertion#Arguments
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('arguments', function() {
    this.params = {operator: 'to be arguments'};

    this.have.class('Arguments');
  });

  Assertion.alias('arguments', 'Arguments');

  /**
   * Assert given object has some type using `typeof`
   * @name type
   * @memberOf Assertion
   * @param {string} type Type name
   * @param {string} [description] Optional message
   * @category assertion types
   */
  Assertion.add('type', function(type, description) {
    this.params = {operator: 'to have type ' + type, message: description};

    should(typeof this.obj).be.exactly(type);
  });

  /**
   * Assert given object is instance of `constructor`
   * @name instanceof
   * @alias Assertion#instanceOf
   * @memberOf Assertion
   * @param {Function} constructor Constructor function
   * @param {string} [description] Optional message
   * @category assertion types
   */
  Assertion.add('instanceof', function(constructor, description) {
    this.params = {operator: 'to be an instance of ' + util.functionName(constructor), message: description};

    this.assert(Object(this.obj) instanceof constructor);
  });

  Assertion.alias('instanceof', 'instanceOf');

  /**
   * Assert given object is function
   * @name Function
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('Function', function() {
    this.params = {operator: 'to be a function'};

    this.have.type('function');
  });

  /**
   * Assert given object is object
   * @name Object
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('Object', function() {
    this.params = {operator: 'to be an object'};

    this.is.not.null().and.have.type('object');
  });

  /**
   * Assert given object is string
   * @name String
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('String', function() {
    this.params = {operator: 'to be a string'};

    this.have.type('string');
  });

  /**
   * Assert given object is array
   * @name Array
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('Array', function() {
    this.params = {operator: 'to be an array'};

    this.have.class('Array');
  });

  /**
   * Assert given object is boolean
   * @name Boolean
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('Boolean', function() {
    this.params = {operator: 'to be a boolean'};

    this.have.type('boolean');
  });

  /**
   * Assert given object is error
   * @name Error
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('Error', function() {
    this.params = {operator: 'to be an error'};

    this.have.instanceOf(Error);
  });

  /**
   * Assert given object is null
   * @name null
   * @alias Assertion#Null
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('null', function() {
    this.params = {operator: 'to be null'};

    this.assert(this.obj === null);
  });

  Assertion.alias('null', 'Null');

  /**
   * Assert given object has some internal [[Class]], via Object.prototype.toString call
   * @name class
   * @alias Assertion#Class
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('class', function(cls) {
    this.params = {operator: 'to have [[Class]] ' + cls};

    this.assert(Object.prototype.toString.call(this.obj) === '[object ' + cls + ']');
  });

  Assertion.alias('class', 'Class');

  /**
   * Assert given object is undefined
   * @name undefined
   * @alias Assertion#Undefined
   * @memberOf Assertion
   * @category assertion types
   */
  Assertion.add('undefined', function() {
    this.params = {operator: 'to be undefined'};

    this.assert(this.obj === void 0);
  });

  Assertion.alias('undefined', 'Undefined');

  /**
   * Assert given object supports es6 iterable protocol (just check
   * that object has property Symbol.iterator, which is a function)
   * @name iterable
   * @memberOf Assertion
   * @category assertion es6
   */
  Assertion.add('iterable', function() {
    this.params = {operator: 'to be iterable'};

    should(this.obj).have.property(Symbol.iterator).which.is.a.Function();
  });

  /**
   * Assert given object supports es6 iterator protocol (just check
   * that object has property next, which is a function)
   * @name iterator
   * @memberOf Assertion
   * @category assertion es6
   */
  Assertion.add('iterator', function() {
    this.params = {operator: 'to be iterator'};

    should(this.obj).have.property('next').which.is.a.Function();
  });

  /**
   * Assert given object is a generator object
   * @name generator
   * @memberOf Assertion
   * @category assertion es6
   */
  Assertion.add('generator', function() {
    this.params = {operator: 'to be generator'};

    should(this.obj).be.iterable
      .and.iterator
      .and.it.is.equal(this.obj[Symbol.iterator]());
  });
};
