'use strict';

var aFrom   = require('es5-ext/array/from')
  , memoize = require('../..');

module.exports = function () {
	return {
		"One arg": function (a) {
			var i = 0, fn = function (x) { ++i; return x; }, mfn
			  , y = { toString: function () { return 'foo'; } };
			mfn = memoize(fn, { primitive: true });
			a(mfn(y), y, "#1");
			a(mfn('foo'), y, "#2");
			a(i, 1, "Called once");
		},
		"Clear cache": function (a) {
			var i = 0, fn = function (x, y, z) { ++i; return x + y + z; }, mfn
			  , y = { toString: function () { return 'foo'; } };
			mfn = memoize(fn, { primitive: true });
			a(mfn(y, 'bar', 'zeta'), 'foobarzeta', "#1");
			a(mfn('foo', 'bar', 'zeta'), 'foobarzeta', "#2");
			a(i, 1, "Called once");
			mfn.delete('foo', { toString: function () { return 'bar'; } },
				'zeta');
			a(mfn(y, 'bar', 'zeta'), 'foobarzeta', "#3");
			a(i, 2, "Called twice");
		},
		"Circular": function (a) {
			var i = 0, fn;
			fn = memoize(function (x) {
				if (++i < 2) fn(x);
			});
			a.throws(function () {
				fn('foo');
			}, 'CIRCULAR_INVOCATION');

			i = 0;
			fn = memoize(function (x, y) {
				if (++i < 2) fn(x, y);
			});
			a.throws(function () {
				fn('foo', 'bar');
			}, 'CIRCULAR_INVOCATION');
		},
		"Resolvers": function () {
			var i = 0, fn, r;
			fn = memoize(function () { ++i; return arguments; },
				{ length: 3, resolvers: [Boolean, String] });
			return {
				"No args": function (a) {
					i = 0;
					a.deep(aFrom(r = fn()), [false, 'undefined'], "First");
					a(fn(), r, "Second");
					a(fn(), r, "Third");
					a(i, 1, "Called once");
				},
				"Some Args": function (a) {
					var x = {};
					i = 0;
					a.deep(aFrom(r = fn(0, 34, x, 45)), [false, '34', x, 45], "First");
					a(fn(0, 34, x, 22), r, "Second");
					a(fn(0, 34, x, false), r, "Third");
					a(i, 1, "Called once");
					return {
						"Other": function (a) {
							a.deep(aFrom(r = fn(1, 34, x, 34)),
								[true, '34', x, 34], "Second");
							a(fn(1, 34, x, 89), r, "Third");
							a(i, 2, "Called once");
						}
					};
				}
			};
		}
	};
};
