Stefanius67 / Formgenerator

    "use strict";

    var BODYTYPES = ["DAYS", "MONTHS", "YEARS"];

    /** @typedef {Object.<string, Function[]>} Handlers */

    /** @typedef {function(String, Function): null} AddHandler */

    /** @typedef {("DAYS"|"MONTHS"|"YEARS")} BodyType */

    /** @typedef {string|number} StringNum */

    /** @typedef {Object.<string, StringNum>} StringNumObj */

    /**

     * The local state

     * @typedef {Object} InstanceState

     * @property {Date} value

     * @property {Number} year

     * @property {Number} month

     * @property {Number} day

     * @property {Number} time

     * @property {Number} hours

     * @property {Number} minutes

     * @property {Number} seconds

     * @property {BodyType} bodyType

     * @property {Boolean} visible

     * @property {Number} cancelBlur

     */

    /** 

     * @typedef {Object} Config

     * @property {String} dateFormat

     * @property {String} timeFormat

     * @property {Boolean} showDate

     * @property {Boolean} showTime

     * @property {Boolean} showSeconds

     * @property {Number} paddingX

     * @property {Number} paddingY

     * @property {BodyType} defaultView

     * @property {"TOP"|"BOTTOM"} direction

     * @property {Array} months

     * @property {Array} monthsShort

     * @property {Array} weekdaysShort

     * @property {Array} timeDescr

    */

    /**

     * @class

     * @param {HTMLElement} elem 

     * @param {Config} config 

     */

    function DTS(elem, config) {

        var config = config || {};

        /** @type {Config} */

        var defaultConfig = {

            defaultView: BODYTYPES[0],

            dateFormat: "yyyy-mm-dd",

            timeFormat: "HH:MM:SS",

            showDate: true,

            showTime: false,

            showSeconds: true,

            paddingX: 5,

            paddingY: 5,

            direction: 'TOP',

            months: [

                "January", "February", "March", "April", "May", "June",

                "July", "August", "September", "October", "November", "December"

            ],

            monthsShort: [

                "Jan", "Feb", "Mar", "Apr", "May", "Jun",

                "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"

            ], 

            weekdaysShort: [

                "Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"

            ],

            timeDescr: [

                "HH:", "MM:", "SS:"

            ]

        }

        if (!elem) {

            throw TypeError("input element or selector required for contructor");

        }

        if (Object.getPrototypeOf(elem) === String.prototype) {

            var _elem = document.querySelectorAll(elem);

            if (!_elem[0]){

                throw Error('"' + elem + '" not found.');

            }

            elem = _elem[0];

        }

        this.config = setDefaults(config, defaultConfig);

        this.dateFormat = this.config.dateFormat;

        this.timeFormat = this.config.timeFormat;

        this.dateFormatRegEx = new RegExp("yyyy|yy|mm|dd", "gi");

        this.timeFormatRegEx = new RegExp("hh|mm|ss|a", "gi");

        this.inputElem = elem;

        this.dtbox = null;

        this.setup();

    }

    DTS.prototype.setup = function () {

        var handler = this.inputElemHandler.bind(this);

        this.inputElem.addEventListener("focus", handler, false)

        this.inputElem.addEventListener("blur", handler, false);

    }

    DTS.prototype.inputElemHandler = function (e) {

        if (e.type == "focus") {

            if (!this.dtbox) {

                this.dtbox = new DTBox(e.target, this);

            }

            this.dtbox.visible = true;

        } else if (e.type == "blur" && this.dtbox && this.dtbox.visible) {

            var self = this;

            setTimeout(function () {

                if (self.dtbox.cancelBlur > 0) {

                    self.dtbox.cancelBlur -= 1;

                 } else {

                    self.dtbox.visible = false;

                    self.inputElem.blur();

                 }

            }, 100);

        }

    }

    /**

     * @class

     * @param {HTMLElement} elem 

     * @param {DTS} settings 

     */

    function DTBox(elem, settings) {

        /** @type {DTBox} */

        var self = this;

        /** @type {Handlers} */

        var handlers = {};

        /** @type {InstanceState} */

        var localState = {};

        /**

         * @param {String} key 

         * @param {*} default_val 

         */

        function getterSetter(key, default_val) {

            return {

                get: function () {

                    var val = localState[key];

                    return val === undefined ? default_val : val;

                },

                set: function (val) {

                    var prevState = self.state;

                    var _handlers = handlers[key] || [];

                    localState[key] = val;

                    for (var i = 0; i < _handlers.length; i++) {

                        _handlers[i].bind(self)(localState, prevState);

                    }

                },

            };

        };

        /** @type {AddHandler} */

        function addHandler(key, handlerFn) {

            if (!key || !handlerFn) {

                return false;

            }

            if (!handlers[key]) {

                handlers[key] = [];

            }

        }

        Object.defineProperties(this, {

            visible: getterSetter("visible", false),

            bodyType: getterSetter("bodyType", settings.config.defaultView),

            value: getterSetter("value"),

            year: getterSetter("year", 0),

            month: getterSetter("month", 0),

            day: getterSetter("day", 0),

            hours: getterSetter("hours", 0),

            minutes: getterSetter("minutes", 0),

            seconds: getterSetter("seconds", 0),

            cancelBlur: getterSetter("cancelBlur", 0),

            addHandler: {value: addHandler},

            month_long: {

                get: function () {

                    return self.settings.config.months[self.month];

                },

            },

            month_short: {

                get: function () {

                    return self.settings.config.monthsShort[self.month]

                },

            },

            state: {

                get: function () {

                    return Object.assign({}, localState);

                },

            },

            time: {

                get: function() {

                    var hours = self.hours * 60 * 60 * 1000;

                    var minutes = self.minutes * 60 * 1000;

                    var seconds = self.seconds * 1000;

                    return  hours + minutes + seconds;

                }

            },

        });

        this.el = {};

        this.settings = settings;

        this.elem = elem;

        this.setup();

    }

    DTBox.prototype.setup = function () {

        Object.defineProperties(this.el, {

            wrapper: { value: null, configurable: true },

            header: { value: null, configurable: true },

            body: { value: null, configurable: true },

            footer: { value: null, configurable: true }

        });

        this.setupWrapper();

        if (this.settings.config.showDate) {

            this.setupHeader();

            this.setupBody();

        }

        if (this.settings.config.showTime) {

            this.setupFooter();

        }

        var self = this;

        this.addHandler("visible", function (state, prevState) {

            if (state.visible && !prevState.visible){

                document.body.appendChild(this.el.wrapper);

                var parts = self.elem.value.split(/\s*,\s*/);

                var startTime = 0;

                if (self.settings.config.showDate) {

                    startDate = parseDate(parts[0], self.settings);

                }

                if (self.settings.config.showTime) {

                    startTime = parseTime(parts[parts.length-1], self.settings);

                    startTime = startTime || 0;

                }

                if (!(startDate && startDate.getTime())) {

                    startDate = new Date();

                    startDate = new Date(

                        startDate.getFullYear(),

                        startDate.getMonth(),

                        startDate.getDate()

                    );

                }

                var value = new Date(startDate.getTime() + startTime);

                self.value = value;

                self.year = value.getFullYear();

                self.month = value.getMonth();

                self.day = value.getDate();

                self.hours = value.getHours();

                self.minutes = value.getMinutes();

                self.seconds = value.getSeconds();

                if (self.settings.config.showDate) {

                    self.setHeaderContent();

                    self.setBodyContent();

                }

                if (self.settings.config.showTime) {

                    self.setFooterContent();

                }

            } else if (!state.visible && prevState.visible) {

                document.body.removeChild(this.el.wrapper);

            }

        });

    }

    DTBox.prototype.setupWrapper = function () {

        if (!this.el.wrapper) {

            var el = document.createElement("div");

            el.classList.add("date-selector-wrapper");

            Object.defineProperty(this.el, "wrapper", { value: el });

        }

        var self = this;

        var htmlRoot = document.getElementsByTagName('html')[0];

            var minTopSpace = 300;

            var box = getOffset(self.elem);

            var config = self.settings.config;

            var paddingY = config.paddingY || 5;

            var paddingX = config.paddingX || 5;

            var top = box.top + self.elem.offsetHeight + paddingY;

            var left = box.left + paddingX;

            var bottom = htmlRoot.clientHeight - box.top + paddingY;

            self.el.wrapper.style.left = `${left}px`;

            if (box.top > minTopSpace && config.direction != 'BOTTOM') {

                self.el.wrapper.style.bottom = `${bottom}px`;

                self.el.wrapper.style.top = '';

            } else {

                self.el.wrapper.style.top = `${top}px`;

                self.el.wrapper.style.bottom = ''; 

            }

        }

            self.cancelBlur += 1;

            setTimeout(function(){

                self.elem.focus();

            }, 50);

        }

        setPosition();

        this.setPosition = setPosition;

        this.el.wrapper.addEventListener("mousedown", handler, false);

        this.el.wrapper.addEventListener("touchstart", handler, false);

        window.addEventListener('resize', this.setPosition);

    }

    DTBox.prototype.setupHeader = function () {

        if (!this.el.header) {

            var row = document.createElement("div");

            var classes = ["cal-nav-prev", "cal-nav-current", "cal-nav-next"];

            row.classList.add("cal-header");

            for (var i = 0; i < 3; i++) {

                var cell = document.createElement("div");

                cell.classList.add("cal-nav", classes[i]);

                cell.onclick = this.onHeaderChange.bind(this);

                row.appendChild(cell);

            }

            row.children[0].innerHTML = "◀"; // "<";

            row.children[2].innerHTML = "▶"; // ">";

            Object.defineProperty(this.el, "header", { value: row });

            tryAppendChild(row, this.el.wrapper);

        }

        this.setHeaderContent();

    }

    DTBox.prototype.setHeaderContent = function () {

        var content = this.year;

        if ("DAYS" == this.bodyType) {

            content = this.month_long + " " + content;

        } else if ("YEARS" == this.bodyType) {

            var start = this.year + 10 - (this.year % 10);

            content = start - 10 + "-" + (start - 1);

        }

        this.el.header.children[1].innerText = content;

    }

    DTBox.prototype.setupBody = function () {

        if (!this.el.body) {

            var el = document.createElement("div");

            el.classList.add("cal-body");

            Object.defineProperty(this.el, "body", { value: el });

            tryAppendChild(el, this.el.wrapper);

        }

        var toAppend = null;

        function makeGrid(rows, cols, className, firstRowClass, clickHandler) {

            var grid = document.createElement("div");

            grid.classList.add(className);

            for (var i = 1; i < rows + 1; i++) {

                var row = document.createElement("div");

                row.classList.add("cal-row", "cal-row-" + i);

                    row.classList.add(firstRowClass);

                }

                for (var j = 1; j < cols + 1; j++) {

                    var col = document.createElement("div");

                    col.classList.add("cal-cell", "cal-col-" + j);

                    col.onclick = clickHandler;

                    row.appendChild(col);

                }

                grid.appendChild(row);

            }

            return grid;

        }

        if ("DAYS" == this.bodyType) {

            toAppend = this.el.body.calDays;

            if (!toAppend) {

                toAppend = makeGrid(7, 7, "cal-days", "cal-day-names", this.onDateSelected.bind(this));

                for (var i = 0; i < 7; i++) {

                    var cell = toAppend.children[0].children[i];

                    cell.innerText = this.settings.config.weekdaysShort[i];

                    cell.onclick = null;

                }

                this.el.body.calDays = toAppend;

            }

        } else if ("MONTHS" == this.bodyType) {

            toAppend = this.el.body.calMonths;

            if (!toAppend) {

                toAppend = makeGrid(3, 4, "cal-months", null, this.onMonthSelected.bind(this));

                    for (var j = 0; j < 4; j++) {

                        var monthShort = this.settings.config.monthsShort[4 * i + j];

                        toAppend.children[i].children[j].innerText = monthShort;

                    }

                }

                this.el.body.calMonths = toAppend;

            }

        } else if ("YEARS" == this.bodyType) {

            toAppend = this.el.body.calYears;

            if (!toAppend) {

                toAppend = makeGrid(3, 4, "cal-years", null, this.onYearSelected.bind(this));

                this.el.body.calYears = toAppend;

            }

        }

        empty(this.el.body);

        tryAppendChild(toAppend, this.el.body);

        this.setBodyContent();

    }

    DTBox.prototype.setBodyContent = function () {

        var grid = this.el.body.children[0];

        var classes = ["cal-cell-prev", "cal-cell-next", "cal-value"];

        if ("DAYS" == this.bodyType) {

            var oneDayMilliSecs = 24 * 60 * 60 * 1000;

            var start = new Date(this.year, this.month, 1);

            var adjusted = new Date(start.getTime() - oneDayMilliSecs * start.getDay());

            grid.children[6].style.display = "";

            for (var i = 1; i < 7; i++) {

                for (var j = 0; j < 7; j++) {

                    var cell = grid.children[i].children[j];

                    var month = adjusted.getMonth();

                    var date = adjusted.getDate();

                    cell.innerText = date;

                    cell.classList.remove(classes[0], classes[1], classes[2]);

                    if (month != this.month) {

                            grid.children[6].style.display = "none";

                            break;

                        }

                        cell.classList.add(month < this.month ? classes[0] : classes[1]);

                    } else if (isEqualDate(adjusted, this.value)){

                        cell.classList.add(classes[2]);

                    }

                    adjusted = new Date(adjusted.getTime() + oneDayMilliSecs);

                }

            }

        } else if ("YEARS" == this.bodyType) {

            var year = this.year - (this.year % 10) - 1;

            for (i = 0; i < 3; i++) {

                for (j = 0; j < 4; j++) {

                    grid.children[i].children[j].innerText = year;

                    year += 1;

                }

            }

            grid.children[0].children[0].classList.add(classes[0]);

            grid.children[2].children[3].classList.add(classes[1]);

        }

    }

    /** @param {Event} e */

    DTBox.prototype.onTimeChange = function(e) {

        e.stopPropagation();

        if (e.type == 'mousedown') {

            this.cancelBlur += 1;

            return;

        }

        if (e.type == 'mouseup') {

            var self = this;

            setTimeout(function(){

                self.elem.focus();

            }, 50);

            return;

        }

        var el = e.target;

        this[el.name] = parseInt(el.value) || 0;

        this.setupFooter();

        this.setInputValue();

    }

    DTBox.prototype.setupFooter = function() {

        if (!this.el.footer) {

            var footer = document.createElement("div");

            var handler = this.onTimeChange.bind(this);

            var self = this;

                var row = document.createElement("div");

                row.classList.add('cal-time');

                var labelCol = row.appendChild(document.createElement("div"));

                labelCol.classList.add('cal-time-label');

                labelCol.innerText = label;

                var valueCol = row.appendChild(document.createElement("div"));

                valueCol.classList.add('cal-time-value');

                valueCol.innerText = '00';

                var inputCol = row.appendChild(document.createElement("div"));

                var slider = inputCol.appendChild(document.createElement("input"));

                Object.assign(slider, {step:1, min:0, max:range, name:name, type:'range'});

                Object.defineProperty(footer, name, {value: slider});

                inputCol.classList.add('cal-time-slider');

                slider.onchange = changeHandler;

                slider.oninput = changeHandler;

                slider.onmousedown = changeHandler;

                slider.onmouseup = changeHandler;

                self[name] = self[name] || parseInt(slider.value) || 0;

                footer.appendChild(row)

            }

            makeRow(this.settings.config.timeDescr[0], 'hours', 23, handler);

            makeRow(this.settings.config.timeDescr[1], 'minutes', 59, handler);

            if (this.settings.config.showSeconds) {

                makeRow(this.settings.config.timeDescr[2], 'seconds', 59, handler);

            }

            footer.classList.add("cal-footer");

            Object.defineProperty(this.el, "footer", { value: footer });

            tryAppendChild(footer, this.el.wrapper);

        }

        this.setFooterContent();

    }

    DTBox.prototype.setFooterContent = function() {

        if (this.el.footer) {

            var footer = this.el.footer;

            footer.hours.value = this.hours;

            footer.children[0].children[1].innerText = padded(this.hours, 2);

            footer.minutes.value = this.minutes;

            footer.children[1].children[1].innerText = padded(this.minutes, 2);

            if (this.settings.config.showSeconds) {

                footer.seconds.value = this.seconds;

                footer.children[2].children[1].innerText = padded(this.seconds, 2);

            }

        }

    }

    DTBox.prototype.setInputValue = function() {

        var date = new Date(this.year, this.month, this.day);

        var strings = [];

        if (this.settings.config.showDate) {

            strings.push(renderDate(date, this.settings));

        }

        if (this.settings.config.showTime) {

            var joined = new Date(date.getTime() + this.time);

            strings.push(renderTime(joined, this.settings));

        }

        this.elem.value = strings.join(', ');

    }

    DTBox.prototype.onDateSelected = function (e) {

        var row = e.target.parentNode;

        var date = parseInt(e.target.innerText);

        if (!(row.nextSibling && row.nextSibling.nextSibling) && date < 8) {

            this.month += 1;

        } else if (!(row.previousSibling && row.previousSibling.previousSibling) && date > 7) {

            this.month -= 1;

        }

        this.day = parseInt(e.target.innerText);

        this.value = new Date(this.year, this.month, this.day);

        this.setInputValue();

        this.setHeaderContent();

        this.setBodyContent();

    }

    /** @param {Event} e */

    DTBox.prototype.onMonthSelected = function (e) {

        var col = 0;

        var row = 2;

        var cell = e.target;

        if (cell.parentNode.nextSibling){

            row = cell.parentNode.previousSibling ? 1: 0;

        }

        if (cell.previousSibling) {

            col = 3;

            if (cell.nextSibling) {

                col = cell.previousSibling.previousSibling ? 2 : 1;

            }

        }

        this.month = 4 * row + col;

        this.bodyType = "DAYS";

        this.setHeaderContent();

        this.setupBody();

    }

    /** @param {Event} e */

    DTBox.prototype.onYearSelected = function (e) {

        this.year = parseInt(e.target.innerText);

        this.bodyType = "MONTHS";

        this.setHeaderContent();

        this.setupBody();

    }

    /** @param {Event} e */

    DTBox.prototype.onHeaderChange = function (e) {

        var cell = e.target;

        if (cell.previousSibling && cell.nextSibling) {

            var idx = BODYTYPES.indexOf(this.bodyType);

            if (idx < 0 || !BODYTYPES[idx + 1]) {

                return;

            }

            this.bodyType = BODYTYPES[idx + 1];

            this.setupBody();

        } else {

            var sign = cell.previousSibling ? 1 : -1;

            switch (this.bodyType) {

                case "DAYS":

                    this.month += sign * 1;

                    break;

                case "MONTHS":

                    this.year += sign * 1;

                    break;

                case "YEARS":

                    this.year += sign * 10;

            }

            if (this.month > 11 || this.month < 0) {

                this.year += Math.floor(this.month / 11);

                this.month = this.month > 11 ? 0 : 11;

            }

        }

        this.setHeaderContent();

        this.setBodyContent();

    }

    /**

     * @param {HTMLElement} elem 

     * @returns {{left:number, top:number}}

     */

    function getOffset(elem) {

        var box = elem.getBoundingClientRect();

        var left = window.pageXOffset !== undefined ? window.pageXOffset : 

            (document.documentElement || document.body.parentNode || document.body).scrollLeft;

        var top = window.pageYOffset !== undefined ? window.pageYOffset : 

            (document.documentElement || document.body.parentNode || document.body).scrollTop;

        return { left: box.left + left, top: box.top + top };

    }

    function empty(e) {

    }

    /** @class */

    function hookFuncs() {

        /** @type {Handlers} */

        this._funcs = {};

    }

    /**

     * @param {string} key 

     * @param {Function} func 

     */

    hookFuncs.prototype.add = function(key, func){

        if (!this._funcs[key]){

            this._funcs[key] = [];

        }

        this._funcs[key].push(func)

    }

    /**

     * @param {String} key 

     * @returns {Function[]} handlers

     */

    hookFuncs.prototype.get = function(key){

        return this._funcs[key] ? this._funcs[key] : [];

    }

    /**

     * @param {Array.<string>} arr 

     * @param {String} string 

     * @returns {Array.<string>} sorted string

     */

    function sortByStringIndex(arr, string) {

        return arr.sort(function(a, b){

            var h = string.indexOf(a);

            var l = string.indexOf(b);

            var rank = 0;

            if (h < l) {

                rank = -1;

            } else if (l < h) {

                rank = 1;

            } else if (a.length > b.length) {

                rank = -1;

            } else if (b.length > a.length) {

                rank = 1;

            }

            return rank;

        });

    }

    /**

     * Remove keys from array that are not in format

     * @param {string[]} keys 

     * @param {string} format 

     * @returns {string[]} new filtered array

     */

    function filterFormatKeys(keys, format) {

        var out = [];

        var formatIdx = 0;

        for (var i = 0; i<keys.length; i++) {

            var key = keys[i];

            if (format.slice(formatIdx).indexOf(key) > -1) {

                formatIdx += key.length;

                out.push(key);

            }

        }

        return out;

    }

    /**

     * @template {StringNumObj} FormatObj

     * @param {string} value 

     * @param {string} format 

     * @param {FormatObj} formatObj 

     * @param {function(Object.<string, hookFuncs>): null} setHooks 

     * @returns {FormatObj} formatObj

     */

    function parseData(value, format, formatObj, setHooks) {

        var hooks = {

        }

        var keys = sortByStringIndex(Object.keys(formatObj), format);

        var filterdKeys = filterFormatKeys(keys, format);

        var vstart = 0; // value start

        if (setHooks) {

            setHooks(hooks);

        }

        for (var i = 0; i < keys.length; i++) {

            var key = keys[i];

            var fstart = format.indexOf(key);

            var _vstart = vstart; // next value start

            var val = null;

            var canSkip = false;

            var funcs = hooks.canSkip.get(key);

            vstart = vstart || fstart;

            for (var j = 0; j < funcs.length; j++) {

                if (funcs[j](formatObj)){

                    canSkip = true;

                    break;

                }

            }

            if (fstart > -1 && !canSkip) {

                var stop = vstart + key.length;

                var fnext = -1;

                var nextKeyIdx = i + 1;

                _vstart += key.length; // set next value start if current key is found

                // get next format token used to determine separator

                while (fnext == -1 && nextKeyIdx < keys.length){

                    var nextKey = keys[nextKeyIdx];

                    nextKeyIdx += 1;

                    if (filterdKeys.indexOf(nextKey) === -1) {

                        continue;

                    }

                    fnext = nextKey ? format.indexOf(nextKey) : -1; // next format start

                }

                if (fnext > -1){

                    sep = format.slice(stop, fnext);

                    if (sep) {

                        var _stop = value.slice(vstart).indexOf(sep);

                        if (_stop && _stop > -1){

                            stop = _stop + vstart;

                            _vstart = stop + sep.length;

                        }

                    }

                }

                val = parseInt(value.slice(vstart, stop));

                for (var k = 0; k < funcs.length; k++) {

                    val = funcs[k](val, formatObj, vstart, stop);

                }

            }

            formatObj[key] = { index: vstart, value: val };

            vstart = _vstart; // set next value start

        }

        return formatObj;

    }

    /**

     * @param {String} value 

     * @param {DTS} settings 

     * @returns {Date} date object

     */

    function parseDate(value, settings) {

        /** @type {{yyyy:number=, yy:number=, mm:number=, dd:number=}} */

        var formatObj = {yyyy:null, yy:null, mm:null, dd:null};

        var format = ((settings.dateFormat) || '').toLowerCase();

        if (!format) {

            throw new TypeError('dateFormat not found (' + settings.dateFormat + ')');

        }

            hooks.canSkip.add("yy", function(data){

                return data["yyyy"].value;

            });

            hooks.updateValue.add("yy", function(val){

                return 100 * Math.floor(new Date().getFullYear() / 100) + val;

            });

        });

        var year = formatObj["yyyy"].value || formatObj["yy"].value;

        var month = formatObj["mm"].value - 1;

        var date = formatObj["dd"].value;

        var result = new Date(year, month, date);

        return result;

    }

    /**

     * @param {String} value 

     * @param {DTS} settings 

     * @returns {Number} time in milliseconds <= (24 * 60 * 60 * 1000) - 1

     */

    function parseTime(value, settings) {

        var format = ((settings.timeFormat) || '').toLowerCase();

        if (!format) {

            throw new TypeError('timeFormat not found (' + settings.timeFormat + ')');

        }

        /** @type {{hh:number=, mm:number=, ss:number=, a:string=}} */

        var formatObj = {hh:null, mm:null, ss:null, a:null};

                return value.slice(start, start + 2);

            });

        });

        var hours = formatObj["hh"].value;

        var minutes = formatObj["mm"].value;

        var seconds = formatObj["ss"].value;

        var am_pm = formatObj["a"].value;

        var am_pm_lower = am_pm ? am_pm.toLowerCase() : am_pm;

        if (am_pm && ["am", "pm"].indexOf(am_pm_lower) > -1){

            if (am_pm_lower == 'am' && hours == 12){

                hours = 0;

            } else if (am_pm_lower == 'pm') {

                hours += 12;

            }

        }

        var time = hours * 60 * 60 * 1000 + minutes * 60 * 1000 + seconds * 1000;

        return time;

    }

    /**

     * @param {Date} value 

     * @param {DTS} settings 

     * @returns {String} date string

     */

    function renderDate(value, settings) {

        var format = settings.dateFormat.toLowerCase();

        var date = value.getDate();

        var month = value.getMonth() + 1;

        var year = value.getFullYear();

        var yearShort = year % 100;

        var formatObj = {

            dd: date < 10 ? "0" + date : date,

            mm: month < 10 ? "0" + month : month,

            yyyy: year,

            yy: yearShort < 10 ? "0" + yearShort : yearShort

        };

        var str = format.replace(settings.dateFormatRegEx, function (found) {

            return formatObj[found];

        });

        return str;

    }

    /**

     * @param {Date} value 

     * @param {DTS} settings 

     * @returns {String} date string

     */

    function renderTime(value, settings) {

        var Format = settings.timeFormat;

        var format = Format.toLowerCase();

        var hours = value.getHours();

        var minutes = value.getMinutes();

        var seconds = value.getSeconds();

        var am_pm = null;

        var hh_am_pm = null;

        if (format.indexOf('a') > -1) {

            am_pm = hours >= 12 ? 'pm' : 'am';

            am_pm = Format.indexOf('A') > -1 ? am_pm.toUpperCase() : am_pm;

        }

        var formatObj = {

            hh: am_pm ? hh_am_pm : (hours < 10 ? "0" + hours : hours),

            mm: minutes < 10 ? "0" + minutes : minutes,

            ss: seconds < 10 ? "0" + seconds : seconds,

            a: am_pm,

        };

        var str = format.replace(settings.timeFormatRegEx, function (found) {

            return formatObj[found];

        });

        return str;

    }

    /**

     * checks if two dates are equal

     * @param {Date} date1 

     * @param {Date} date2 

     * @returns {Boolean} true or false

     */

    function isEqualDate(date1, date2) {

        return (date1.getFullYear() == date2.getFullYear() && 

                date1.getMonth() == date2.getMonth() && 

                date1.getDate() == date2.getDate());

    }

    /**

     * @param {Number} val 

     * @param {Number} pad 

     * @param {*} default_val 

     * @returns {String} padded string

     */

    function padded(val, pad, default_val) {

        var default_val = default_val || 0;

        var valStr = '' + (parseInt(val) || default_val);

        var diff = Math.max(pad, valStr.length) - valStr.length;

        return ('' + default_val).repeat(diff) + valStr;

    }

    /**

     * @template X

     * @template Y

     * @param {X} obj 

     * @param {Y} objDefaults 

     * @returns {X|Y} merged object

     */

    function setDefaults(obj, objDefaults) {

        var keys = Object.keys(objDefaults);

        for (var i=0; i<keys.length; i++) {

            var key = keys[i];

            if (!Object.prototype.hasOwnProperty.call(obj, key)) {

                obj[key] = objDefaults[key];

            }

        }

        return obj;

    }

    window.dtsel = Object.create({},{

        DTS: { value: DTS },

        DTObj: { value: DTBox },

        fn: {

            value: Object.defineProperties({}, {

                empty: { value: empty },

                appendAfter: {

                    value: function (newElem, refNode) {

                        refNode.parentNode.insertBefore(newElem, refNode.nextSibling);

                    },

                },

                getOffset: { value: getOffset },

                parseDate: { value: parseDate },

                renderDate: { value: renderDate },

                parseTime: {value: parseTime},

                renderTime: {value: renderTime},

                setDefaults: {value: setDefaults},

            }),

        },

    });

})();