var testDataLength = 500000;

(function () {
    function createTimeLog(func, timer) {
        console.time(timer);
        func();
        console.timeEnd(timer);
    }

    function createTaskTitle(title) {
        console.log("%c" + title, 'font-size: 18px');
    }

    function generateSimpleArray(length) {
        var arr = [];
        for (var i = 1; i < length; i++) {
            arr.push(i*2);
        }
        return arr;
    }

    function generateObject(length) {
        var obj = {};
        for (var i = 1; i < length; i++) {
            obj['key' + i] = {Name: 'random string', LastName: 'random string'} ;
        }
        return obj;
    }

    function generateArrayOfObject(length) {
        var arr = [];
        for (var i = 1; i < length; i++) {
            arr.push({Name: 'random string', LastName: 'random string'});
        }
        return arr;
    }

    function summArrayFor(arr) {
        var res = 0;
        for (var i = 0; i < arr.length; i++) {
            res += arr[i];
        }
        return res;
    }

    function summArrayReduce(arr) {
        return arr.reduce(function(res, value) {
            return res + value;
        }, 0);
    }

    function arraysKeysToLowerCaseByFor(arr) {
        var isArr = arr instanceof Object && arr instanceof Array;
        if (!isArr) return objectKeysToLowerCaseByFor(arr);
        for (var i = 0; i < arr.length; i++) {
           if (arr[i] instanceof Array) {
              arraysKeysToLowerCaseByFor(arr[i]);
           } else if (arr[i] instanceof Object) {
              objectKeysToLowerCaseByFor(arr[i]);
           }
        }
        return arr;
    }

    function arraysKeysToLowerCaseByMap(arr) {
        var isArr = arr instanceof Object && arr instanceof Array;
        if (!isArr) return objectKeysToLowerCaseByFor(arr);
        arr.map(function (value) {
            if (value instanceof Array) {
              arraysKeysToLowerCaseByFor(value);
           } else if (value instanceof Object) {
              objectKeysToLowerCaseByFor(value);
           }
        });
        return arr;
    }

    function objectKeysToLowerCaseByFor(obj) {
        if (obj instanceof Array) {
            return arraysKeysToLowerCaseByFor(obj);
        }

        var keys = Object.keys(obj);
        for (var i = 0; i < keys.length; i++) {
            if (obj.hasOwnProperty(keys[i])) {
                var newKey = keys[i].toLowerCase();
                if (obj[keys[i]] instanceof Object) objectKeysToLowerCaseByFor(obj[keys[i]]);
                if (newKey !== keys[i]) {
                    obj[newKey] = obj[keys[i]];
                    delete obj[keys[i]];
                }
            }

        }
        return obj;
    }

    function objectKeysToLowerCaseByForIn(obj) {
        for (var key in obj) {
            if (obj.hasOwnProperty(key)) {
                var newKey = key.toLowerCase();
                if (obj[key] instanceof Object) objectKeysToLowerCaseByForIn(obj[key]);
                if (newKey !== key) {
                    obj[newKey] = obj[key];
                    delete obj[key];
                }
            }
        }
        return obj;
    }

    function objectKeysToLowerCaseByForEach(obj) {
        Object.keys(obj).forEach(function (key) {
            var newKey = key.toLowerCase();
                if (obj[key] instanceof Object) objectKeysToLowerCaseByForEach(obj[key]);
                if (newKey !== key) {
                    obj[newKey] = obj[key];
                    delete obj[key];
                }
        });
        return obj;
    }


    // Task 1
    var array100 = generateSimpleArray(testDataLength);
    createTaskTitle("Task #1");
    createTimeLog(function () { return summArrayFor(array100); }, 'Sum array with ' + testDataLength + ' by *FOR* loop');
    createTimeLog(function () { return summArrayReduce(array100); }, 'Sum array with ' + testDataLength + ' by *REDUCE* loop');

    // Task 2
    var object100 = generateObject(testDataLength), object100a = generateObject(testDataLength), object100b = generateObject(testDataLength);
    createTaskTitle("Task #2");
    createTimeLog(function () { return objectKeysToLowerCaseByFor(object100); }, 'Object keys with ' + testDataLength + ' items to lower case by *FOR* and *Object.keys*');
    createTimeLog(function () { return objectKeysToLowerCaseByForIn(object100a); }, 'Object keys with ' + testDataLength + ' items to lower case by *FOR IN* loop');
    createTimeLog(function () { return objectKeysToLowerCaseByForEach(object100b); }, 'Object keys with ' + testDataLength + ' items to lower case by *FOR EACH* and *Object.keys*');

    // Task 3
    var array100 = generateArrayOfObject(testDataLength), array100a = generateArrayOfObject(testDataLength);
    createTaskTitle("Task #3");
    createTimeLog(function () { return arraysKeysToLowerCaseByFor(array100); }, 'Array with ' + testDataLength + ' objects to lowercase by *FOR*');
    createTimeLog(function () { return arraysKeysToLowerCaseByMap(array100a); }, 'Array with ' + testDataLength + ' objects to lowercase by *MAP*');
})();