/*
 * Parameterize v 0.4
 * A QUnit Addon For Running Parameterized Tests
 * https://github.com/AStepaniuk/qunit-parameterize
 * Released under the MIT license.
 */
QUnit.extend(QUnit, {
	cases: (function() {
		'use strict';
		var currentCases = null,
			clone = function(testCase) {
				var result = {},
					p = null;

				for (p in testCase) {
					if (testCase.hasOwnProperty(p)) {
						result[p] = testCase[p];
					}
				}

				return result;
			},

			createTest = function(methodName, title, callback, parameters) {

				QUnit[methodName](title, function(assert) {
					return callback.call(this, parameters, assert);
				});
			},

			iterateTestCases = function(methodName, title, callback) {
				var i = 0,
					parameters = null,
					testCaseTitle = null;

				if (!currentCases || currentCases.length === 0) {
					// setup test which will always fail
					QUnit.test(title, function(assert) {
						assert.ok(false, "No test cases are provided");
					});
					return;
				}

				for (i = 0; i < currentCases.length; i += 1) {
					parameters = currentCases[i];

					testCaseTitle = title;
					if (parameters.title) {
						testCaseTitle += "[" + parameters.title + "]";
					}

					if (parameters._skip === true) {
						methodName = 'skip';
					}

					createTest(methodName, testCaseTitle, callback, parameters);
				}
			},

			getLength = function(arr) {
				return arr ? arr.length : 0;
			},

			getItem = function(arr, idx) {
				return arr ? arr[idx] : undefined;
			},

			mix = function(testCase, mixData) {
				var result = null,
					p = null;

				if (testCase && mixData) {
					result = clone(testCase);

					for (p in mixData) {
						if (mixData.hasOwnProperty(p)) {
							if (p !== "title") {
								if (!(result.hasOwnProperty(p))) {
									result[p] = mixData[p];
								}
							} else {
								result[p] = [result[p], mixData[p]].join("");
							}
						}
					}

				} else if (testCase) {
					result = testCase;
				} else if (mixData) {
					result = mixData;
				} else {
					// return null or undefined whatever testCase is
					result = testCase;
				}

				return result;
			};

		return {

			init: function(testCasesList) {
				currentCases = testCasesList;
				return this;
			},

			sequential: function(addData) {
				var casesLength = getLength(currentCases),
					addDataLength = getLength(addData),
					length = casesLength > addDataLength ? casesLength : addDataLength,
					newCases = [],
					i = 0,
					currentCaseI = null,
					dataI = null,
					newCase = null;

				for (i = 0; i < length; i += 1) {
					currentCaseI = getItem(currentCases, i);
					dataI = getItem(addData, i);
					newCase = mix(currentCaseI, dataI);

					if (newCase) {
						newCases.push(newCase);
					}
				}

				currentCases = newCases;

				return this;
			},

			combinatorial: function(mixData) {
				var current = (currentCases && currentCases.length > 0) ? currentCases : [null],
					currentLength = current.length,
					mixDataLength = 0,
					newCases = [],
					i = 0,
					j = 0,
					currentCaseI = null,
					dataJ = null,
					newCase = null;

				mixData = (mixData && mixData.length > 0) ? mixData : [null];
				mixDataLength = mixData.length;

				for (i = 0; i < currentLength; i += 1) {
					for (j = 0; j < mixDataLength; j += 1) {
						currentCaseI = current[i];
						dataJ = mixData[j];
						newCase = mix(currentCaseI, dataJ);

						if (newCase) {
							newCases.push(newCase);
						}
					}
				}

				currentCases = newCases;

				return this;
			},

			test: function(title, callback) {
				iterateTestCases("test", title, callback);
				return this;
			},

			getCurrentTestCases: function () {
				return currentCases;
			}
		};
	}())
});