'use strict';

var keys = require('object-keys');
var map = require('array.prototype.map');
var define = require('define-properties');

var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';

module.exports = function (entries, t) {
	var a = {};
	var b = {};
	var c = {};
	var obj = { a: a, b: b, c: c };

	t.deepEqual(entries(obj), [['a', a], ['b', b], ['c', c]], 'basic support');
	t.deepEqual(entries({ a: a, b: a, c: c }), [['a', a], ['b', a], ['c', c]], 'duplicate entries are included');

	t.test('entries are in the same order as keys', function (st) {
		var object = { a: a, b: b };
		object[0] = 3;
		object.c = c;
		object[1] = 4;
		delete object[0];
		var objKeys = keys(object);
		var objEntries = map(objKeys, function (key) {
			return [key, object[key]];
		});
		st.deepEqual(entries(object), objEntries, 'entries match key order');
		st.end();
	});

	t.test('non-enumerable properties are omitted', { skip: !Object.defineProperty }, function (st) {
		var object = { a: a, b: b };
		Object.defineProperty(object, 'c', { enumerable: false, value: c });
		st.deepEqual(entries(object), [['a', a], ['b', b]], 'non-enumerable property‘s value is omitted');
		st.end();
	});

	t.test('inherited properties are omitted', function (st) {
		var F = function G() {};
		F.prototype.a = a;
		var f = new F();
		f.b = b;
		st.deepEqual(entries(f), [['b', b]], 'only own properties are included');
		st.end();
	});

	t.test('Symbol properties are omitted', { skip: !hasSymbols }, function (st) {
		var object = { a: a, b: b, c: c };
		var enumSym = Symbol('enum');
		var nonEnumSym = Symbol('non enum');
		object[enumSym] = enumSym;
		object.d = enumSym;
		Object.defineProperty(object, nonEnumSym, { enumerable: false, value: nonEnumSym });
		st.deepEqual(entries(object), [['a', a], ['b', b], ['c', c], ['d', enumSym]], 'symbol properties are omitted');
		st.end();
	});

	t.test('not-yet-visited keys deleted on [[Get]] must not show up in output', { skip: !define.supportsDescriptors }, function (st) {
		var o = { a: 1, b: 2, c: 3 };
		Object.defineProperty(o, 'a', {
			get: function () {
				delete this.b;
				return 1;
			}
		});
		st.deepEqual(entries(o), [['a', 1], ['c', 3]], 'when "b" is deleted prior to being visited, it should not show up');
		st.end();
	});

	t.test('not-yet-visited keys made non-enumerable on [[Get]] must not show up in output', { skip: !define.supportsDescriptors }, function (st) {
		var o = { a: 'A', b: 'B' };
		Object.defineProperty(o, 'a', {
			get: function () {
				Object.defineProperty(o, 'b', { enumerable: false });
				return 'A';
			}
		});
		st.deepEqual(entries(o), [['a', 'A']], 'when "b" is made non-enumerable prior to being visited, it should not show up');
		st.end();
	});
};