/**
 * webtrees: online genealogy
 * Copyright (C) 2019 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

'use strict';

let webtrees = function () {
    const lang = document.documentElement.lang;

    /**
     * Tidy the whitespace in a string.
     */
    function trim(str) {
        return str.replace(/\s+/g, " ").trim();

    }

    /**
     * Look for non-latin characters in a string.
     */
    function detectScript(str) {
        if (str.match(/[\u3400-\u9FCC]/)) {
            return "cjk";
        } else if (str.match(/[\u0370-\u03FF]/)) {
            return "greek";
        } else if (str.match(/[\u0400-\u04FF]/)) {
            return "cyrillic";
        } else if (str.match(/[\u0590-\u05FF]/)) {
            return "hebrew";
        } else if (str.match(/[\u0600-\u06FF]/)) {
            return "arabic";
        }

        return "latin";
    }

    /**
     * In some languages, the SURN uses a male/default form, but NAME uses a gender-inflected form.
     */
    function inflectSurname(surname, sex) {
        if (lang === "pl" && sex === "F") {
            return surname
                .replace(/ski$/, "ska")
                .replace(/cki$/, "cka")
                .replace(/dzki$/, "dzka")
                .replace(/żki$/, "żka");
        }

        return surname;
    }

    /**
     * Build a NAME from a NPFX, GIVN, SPFX, SURN and NSFX parts.
     *
     * Assumes the language of the document is the same as the language of the name.
     */
    function buildNameFromParts(npfx, givn, spfx, surn, nsfx, sex) {
        const usesCJK      = detectScript(npfx + givn + spfx + givn + surn + nsfx) === "cjk";
        const separator    = usesCJK ? "" : " ";
        const surnameFirst = usesCJK || ['hu', 'jp', 'ko', 'vi', 'zh-Hans', 'zh-Hant'].indexOf(lang) !== -1;
        const patronym     = ['is'].indexOf(lang) !== -1;
        const slash        = patronym ? "" : "/";

        // GIVN and SURN may be a comma-separated lists.
        npfx = trim(npfx);
        givn = trim(givn.replace(",", separator));
        spfx = trim(spfx);
        surn = inflectSurname(trim(surn.replace(",", separator)), sex);
        nsfx = trim(nsfx);

        const surname = trim(spfx + separator + surn);

        const name = surnameFirst ? slash + surname + slash + separator + givn : givn + separator + slash + surname + slash;

        return trim(npfx + separator + name + separator + nsfx);
    }

    // Public methods
    return {
        buildNameFromParts: buildNameFromParts,
        detectScript:       detectScript,
    };
}();

function expand_layer(sid)
{
    $('#' + sid + '_img').toggleClass('icon-plus icon-minus');
    $('#' + sid).slideToggle('fast');
    $('#' + sid + '-alt').toggle(); // hide something when we show the layer - and vice-versa
    return false;
}

var pastefield;
function addmedia_links(field, iid, iname)
{
    pastefield = field;
    insertRowToTable(iid, iname);
    return false;
}

function valid_date(datefield, dmy)
{
    var months = ['JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL', 'AUG', 'SEP', 'OCT', 'NOV', 'DEC'];
    var hijri_months = ['MUHAR', 'SAFAR', 'RABIA', 'RABIT', 'JUMAA', 'JUMAT', 'RAJAB', 'SHAAB', 'RAMAD', 'SHAWW', 'DHUAQ', 'DHUAH'];
    var hebrew_months = ['TSH', 'CSH', 'KSL', 'TVT', 'SHV', 'ADR', 'ADS', 'NSN', 'IYR', 'SVN', 'TMZ', 'AAV', 'ELL'];
    var french_months = ['VEND', 'BRUM', 'FRIM', 'NIVO', 'PLUV', 'VENT', 'GERM', 'FLOR', 'PRAI', 'MESS', 'THER', 'FRUC', 'COMP'];
    var jalali_months = ['FARVA', 'ORDIB', 'KHORD', 'TIR', 'MORDA', 'SHAHR', 'MEHR', 'ABAN', 'AZAR', 'DEY', 'BAHMA', 'ESFAN'];

    var datestr = datefield.value;
  // if a date has a date phrase marked by () this has to be excluded from altering
    var datearr = datestr.split('(');
    var datephrase = '';
    if (datearr.length > 1) {
        datestr = datearr[0];
        datephrase = datearr[1];
    }

  // Gedcom dates are upper case
    datestr = datestr.toUpperCase();
  // Gedcom dates have no leading/trailing/repeated whitespace
    datestr = datestr.replace(/\s+/, ' ');
    datestr = datestr.replace(/(^\s)|(\s$)/, '');
  // Gedcom dates have spaces between letters and digits, e.g. "01JAN2000" => "01 JAN 2000"
    datestr = datestr.replace(/(\d)([A-Z])/, '$1 $2');
    datestr = datestr.replace(/([A-Z])(\d)/, '$1 $2');

  // Shortcut for quarter format, "Q1 1900" => "BET JAN 1900 AND MAR 1900". See [ 1509083 ]
    if (datestr.match(/^Q ([1-4]) (\d\d\d\d)$/)) {
        datestr = 'BET ' + months[RegExp.$1 * 3 - 3] + ' ' + RegExp.$2 + ' AND ' + months[RegExp.$1 * 3 - 1] + ' ' + RegExp.$2;
    }

  // Shortcut for @#Dxxxxx@ 01 01 1400, etc.
    if (datestr.match(/^(@#DHIJRI@|HIJRI)( \d?\d )(\d?\d)( \d?\d?\d?\d)$/)) {
        datestr = '@#DHIJRI@' + RegExp.$2 + hijri_months[parseInt(RegExp.$3, 10) - 1] + RegExp.$4;
    }
    if (datestr.match(/^(@#DJALALI@|JALALI)( \d?\d )(\d?\d)( \d?\d?\d?\d)$/)) {
        datestr = '@#DJALALI@' + RegExp.$2 + jalali_months[parseInt(RegExp.$3, 10) - 1] + RegExp.$4;
    }
    if (datestr.match(/^(@#DHEBREW@|HEBREW)( \d?\d )(\d?\d)( \d?\d?\d?\d)$/)) {
        datestr = '@#DHEBREW@' + RegExp.$2 + hebrew_months[parseInt(RegExp.$3, 10) - 1] + RegExp.$4;
    }
    if (datestr.match(/^(@#DFRENCH R@|FRENCH)( \d?\d )(\d?\d)( \d?\d?\d?\d)$/)) {
        datestr = '@#DFRENCH R@' + RegExp.$2 + french_months[parseInt(RegExp.$3, 10) - 1] + RegExp.$4;
    }

  // e.g. 17.11.1860, 03/04/2005 or 1999-12-31. Use locale settings where DMY order is ambiguous.
    var qsearch = /^([^\d]*)(\d+)[^\d](\d+)[^\d](\d+)$/i;
    if (qsearch.exec(datestr)) {
        var f0 = RegExp.$1;
        var f1 = parseInt(RegExp.$2, 10);
        var f2 = parseInt(RegExp.$3, 10);
        var f3 = parseInt(RegExp.$4, 10);
        var yyyy = new Date().getFullYear();
        var yy = yyyy % 100;
        var cc = yyyy - yy;
        if (dmy === 'DMY' && f1 <= 31 && f2 <= 12 || f1 > 13 && f1 <= 31 && f2 <= 12 && f3 > 31) {
            datestr = f0 + f1 + ' ' + months[f2 - 1] + ' ' + (f3 >= 100 ? f3 : (f3 <= yy ? f3 + cc : f3 + cc - 100));
        } else {
            if (dmy === 'MDY' && f1 <= 12 && f2 <= 31 || f2 > 13 && f2 <= 31 && f1 <= 12 && f3 > 31) {
                datestr = f0 + f2 + ' ' + months[f1 - 1] + ' ' + (f3 >= 100 ? f3 : (f3 <= yy ? f3 + cc : f3 + cc - 100));
            } else {
                if (dmy === 'YMD' && f2 <= 12 && f3 <= 31 || f3 > 13 && f3 <= 31 && f2 <= 12 && f1 > 31) {
                    datestr = f0 + f3 + ' ' + months[f2 - 1] + ' ' + (f1 >= 100 ? f1 : (f1 <= yy ? f1 + cc : f1 + cc - 100));
                }
            }
        }
    }

  // Shortcuts for date ranges
    datestr = datestr.replace(/^[>]([\w ]+)$/, 'AFT $1');
    datestr = datestr.replace(/^[<]([\w ]+)$/, 'BEF $1');
    datestr = datestr.replace(/^([\w ]+)[-]$/, 'FROM $1');
    datestr = datestr.replace(/^[-]([\w ]+)$/, 'TO $1');
    datestr = datestr.replace(/^[~]([\w ]+)$/, 'ABT $1');
    datestr = datestr.replace(/^[*]([\w ]+)$/, 'EST $1');
    datestr = datestr.replace(/^[#]([\w ]+)$/, 'CAL $1');
    datestr = datestr.replace(/^([\w ]+) ?- ?([\w ]+)$/, 'BET $1 AND $2');
    datestr = datestr.replace(/^([\w ]+) ?~ ?([\w ]+)$/, 'FROM $1 TO $2');

  // Convert full months to short months
    datestr = datestr.replace(/(JANUARY)/, 'JAN');
    datestr = datestr.replace(/(FEBRUARY)/, 'FEB');
    datestr = datestr.replace(/(MARCH)/, 'MAR');
    datestr = datestr.replace(/(APRIL)/, 'APR');
    datestr = datestr.replace(/(MAY)/, 'MAY');
    datestr = datestr.replace(/(JUNE)/, 'JUN');
    datestr = datestr.replace(/(JULY)/, 'JUL');
    datestr = datestr.replace(/(AUGUST)/, 'AUG');
    datestr = datestr.replace(/(SEPTEMBER)/, 'SEP');
    datestr = datestr.replace(/(OCTOBER)/, 'OCT');
    datestr = datestr.replace(/(NOVEMBER)/, 'NOV');
    datestr = datestr.replace(/(DECEMBER)/, 'DEC');

  // Americans frequently enter dates as SEP 20, 1999
  // No need to internationalise this, as this is an english-language issue
    datestr = datestr.replace(/(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)\.? (\d\d?)[, ]+(\d\d\d\d)/, '$2 $1 $3');

  // Apply leading zero to day numbers
    datestr = datestr.replace(/(^| )(\d [A-Z]{3,5} \d{4})/, '$10$2');

    if (datephrase) {
        datestr = datestr + ' (' + datephrase;
    }
  // Only update it if is has been corrected - otherwise input focus
  // moves to the end of the field unnecessarily
    if (datefield.value !== datestr) {
        datefield.value = datestr;
    }
}

var monthLabels = [];
monthLabels[1] = 'January';
monthLabels[2] = 'February';
monthLabels[3] = 'March';
monthLabels[4] = 'April';
monthLabels[5] = 'May';
monthLabels[6] = 'June';
monthLabels[7] = 'July';
monthLabels[8] = 'August';
monthLabels[9] = 'September';
monthLabels[10] = 'October';
monthLabels[11] = 'November';
monthLabels[12] = 'December';

var monthShort = [];
monthShort[1] = 'JAN';
monthShort[2] = 'FEB';
monthShort[3] = 'MAR';
monthShort[4] = 'APR';
monthShort[5] = 'MAY';
monthShort[6] = 'JUN';
monthShort[7] = 'JUL';
monthShort[8] = 'AUG';
monthShort[9] = 'SEP';
monthShort[10] = 'OCT';
monthShort[11] = 'NOV';
monthShort[12] = 'DEC';

var daysOfWeek = [];
daysOfWeek[0] = 'S';
daysOfWeek[1] = 'M';
daysOfWeek[2] = 'T';
daysOfWeek[3] = 'W';
daysOfWeek[4] = 'T';
daysOfWeek[5] = 'F';
daysOfWeek[6] = 'S';

var weekStart = 0;

function cal_setMonthNames(jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec)
{
    monthLabels[1] = jan;
    monthLabels[2] = feb;
    monthLabels[3] = mar;
    monthLabels[4] = apr;
    monthLabels[5] = may;
    monthLabels[6] = jun;
    monthLabels[7] = jul;
    monthLabels[8] = aug;
    monthLabels[9] = sep;
    monthLabels[10] = oct;
    monthLabels[11] = nov;
    monthLabels[12] = dec;
}

function cal_setDayHeaders(sun, mon, tue, wed, thu, fri, sat)
{
    daysOfWeek[0] = sun;
    daysOfWeek[1] = mon;
    daysOfWeek[2] = tue;
    daysOfWeek[3] = wed;
    daysOfWeek[4] = thu;
    daysOfWeek[5] = fri;
    daysOfWeek[6] = sat;
}

function cal_setWeekStart(day)
{
    if (day >= 0 && day < 7) {
        weekStart = day;
    }
}

function calendarWidget(dateDivId, dateFieldId)
{
    var dateDiv = document.getElementById(dateDivId);
    var dateField = document.getElementById(dateFieldId);

    if (dateDiv.style.visibility === 'visible') {
        dateDiv.style.visibility = 'hidden';
        return false;
    }
    if (dateDiv.style.visibility === 'show') {
        dateDiv.style.visibility = 'hide';
        return false;
    }

  /* Javascript calendar functions only work with precise gregorian dates "D M Y" or "Y" */
    var greg_regex = /((\d+ (JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC) )?\d+)/i;
    var date;
    if (greg_regex.exec(dateField.value)) {
        date = new Date(RegExp.$1);
    } else {
        date = new Date();
    }

    dateDiv.innerHTML = cal_generateSelectorContent(dateFieldId, dateDivId, date);
    if (dateDiv.style.visibility === 'hidden') {
        dateDiv.style.visibility = 'visible';
        return false;
    }
    if (dateDiv.style.visibility === 'hide') {
        dateDiv.style.visibility = 'show';
        return false;
    }

    return false;
}

function cal_generateSelectorContent(dateFieldId, dateDivId, date)
{
    var i, j;
    var content = '<table border="1"><tr>';
    content += '<td><select class="form-control" id="' + dateFieldId + '_daySelect" onchange="return cal_updateCalendar(\'' + dateFieldId + '\', \'' + dateDivId + '\');">';
    for (i = 1; i < 32; i++) {
        content += '<option value="' + i + '"';
        if (date.getDate() === i) {
            content += ' selected="selected"';
        }
        content += '>' + i + '</option>';
    }
    content += '</select></td>';
    content += '<td><select class="form-control" id="' + dateFieldId + '_monSelect" onchange="return cal_updateCalendar(\'' + dateFieldId + '\', \'' + dateDivId + '\');">';
    for (i = 1; i < 13; i++) {
        content += '<option value="' + i + '"';
        if (date.getMonth() + 1 === i) {
            content += ' selected="selected"';
        }
        content += '>' + monthLabels[i] + '</option>';
    }
    content += '</select></td>';
    content += '<td><input class="form-control" type="text" id="' + dateFieldId + '_yearInput" size="5" value="' + date.getFullYear() + '" onchange="return cal_updateCalendar(\'' + dateFieldId + '\', \'' + dateDivId + '\');" /></td></tr>';
    content += '<tr><td colspan="3">';
    content += '<table width="100%">';
    content += '<tr>';
    j = weekStart;
    for (i = 0; i < 7; i++) {
        content += '<td ';
        content += 'class="descriptionbox"';
        content += '>';
        content += daysOfWeek[j];
        content += '</td>';
        j++;
        if (j > 6) {
            j = 0;
        }
    }
    content += '</tr>';

    var tdate = new Date(date.getFullYear(), date.getMonth(), 1);
    var day = tdate.getDay();
    day = day - weekStart;
    var daymilli = 1000 * 60 * 60 * 24;
    tdate = tdate.getTime() - (day * daymilli) + (daymilli / 2);
    tdate = new Date(tdate);

    for (j = 0; j < 6; j++) {
        content += '<tr>';
        for (i = 0; i < 7; i++) {
            content += '<td ';
            if (tdate.getMonth() === date.getMonth()) {
                if (tdate.getDate() === date.getDate()) {
                    content += 'class="descriptionbox"';
                } else {
                    content += 'class="optionbox"';
                }
            } else {
                content += 'style="background-color:#EAEAEA; border: solid #AAAAAA 1px;"';
            }
            content += '><a href="#" onclick="return cal_dateClicked(\'' + dateFieldId + '\', \'' + dateDivId + '\', ' + tdate.getFullYear() + ', ' + tdate.getMonth() + ', ' + tdate.getDate() + ');">';
            content += tdate.getDate();
            content += '</a></td>';
            var datemilli = tdate.getTime() + daymilli;
            tdate = new Date(datemilli);
        }
        content += '</tr>';
    }
    content += '</table>';
    content += '</td></tr>';
    content += '</table>';

    return content;
}

function cal_setDateField(dateFieldId, year, month, day)
{
    var dateField = document.getElementById(dateFieldId);
    if (!dateField) {
        return false;
    }
    if (day < 10) {
        day = '0' + day;
    }
    dateField.value = day + ' ' + monthShort[month + 1] + ' ' + year;
    return false;
}

function cal_updateCalendar(dateFieldId, dateDivId)
{
    var dateSel = document.getElementById(dateFieldId + '_daySelect');
    if (!dateSel) {
        return false;
    }
    var monthSel = document.getElementById(dateFieldId + '_monSelect');
    if (!monthSel) {
        return false;
    }
    var yearInput = document.getElementById(dateFieldId + '_yearInput');
    if (!yearInput) {
        return false;
    }

    var month = parseInt(monthSel.options[monthSel.selectedIndex].value, 10);
    month = month - 1;

    var date = new Date(yearInput.value, month, dateSel.options[dateSel.selectedIndex].value);
    cal_setDateField(dateFieldId, date.getFullYear(), date.getMonth(), date.getDate());

    var dateDiv = document.getElementById(dateDivId);
    if (!dateDiv) {
        alert('no dateDiv ' + dateDivId);
        return false;
    }
    dateDiv.innerHTML = cal_generateSelectorContent(dateFieldId, dateDivId, date);

    return false;
}

function cal_dateClicked(dateFieldId, dateDivId, year, month, day)
{
    cal_setDateField(dateFieldId, year, month, day);
    calendarWidget(dateDivId, dateFieldId);
    return false;
}

function openerpasteid(id)
{
    if (window.opener.paste_id) {
        window.opener.paste_id(id);
    }
    window.close();
}

function paste_id(value)
{
    pastefield.value = value;
}

function pastename(name)
{
    if (nameElement) {
        nameElement.innerHTML = name;
    }
    if (remElement) {
        remElement.style.display = 'block';
    }
}

function paste_char(value)
{
    if (document.selection) {
      // IE
        pastefield.focus();
        document.selection.createRange().text = value;
    } else if (pastefield.selectionStart || pastefield.selectionStart === 0) {
      // Mozilla/Chrome/Safari
        pastefield.value =
        pastefield.value.substring(0, pastefield.selectionStart) +
        value +
        pastefield.value.substring(pastefield.selectionEnd, pastefield.value.length);
        pastefield.selectionStart = pastefield.selectionEnd = pastefield.selectionStart + value.length;
    } else {
      // Fallback? - just append
        pastefield.value += value;
    }

    if (pastefield.id === 'NPFX' || pastefield.id === 'GIVN' || pastefield.id === 'SPFX' || pastefield.id === 'SURN' || pastefield.id === 'NSFX') {
        updatewholename();
    }
}

/**
 * Persistant checkbox options to hide/show extra data.

 * @param element_id
 */
function persistent_toggle(element_id)
{
    let element = document.getElementById(element_id);
    let key     = 'state-of-' + element_id;
    let state   = localStorage.getItem(key);

    // Previously selected?
    if (state === 'true') {
        $(element).click();
    }

    // Remember state for the next page load.
    $(element).on('change', function() { localStorage.setItem(key, element.checked); });
}

function valid_lati_long(field, pos, neg)
{
  // valid LATI or LONG according to Gedcom standard
  // pos (+) : N or E
  // neg (-) : S or W
    var txt = field.value.toUpperCase();
    txt = txt.replace(/(^\s*)|(\s*$)/g, ''); // trim
    txt = txt.replace(/ /g, ':'); // N12 34 ==> N12.34
    txt = txt.replace(/\+/g, ''); // +17.1234 ==> 17.1234
    txt = txt.replace(/-/g, neg); // -0.5698 ==> W0.5698
    txt = txt.replace(/,/g, '.'); // 0,5698 ==> 0.5698
  // 0°34'11 ==> 0:34:11
    txt = txt.replace(/\u00b0/g, ':'); // °
    txt = txt.replace(/\u0027/g, ':'); // '
  // 0:34:11.2W ==> W0.5698
    txt = txt.replace(/^([0-9]+):([0-9]+):([0-9.]+)(.*)/g, function ($0, $1, $2, $3, $4) {
        var n = parseFloat($1);
        n += ($2 / 60);
        n += ($3 / 3600);
        n = Math.round(n * 1E4) / 1E4;
        return $4 + n;
    });
  // 0:34W ==> W0.5667
    txt = txt.replace(/^([0-9]+):([0-9]+)(.*)/g, function ($0, $1, $2, $3) {
        var n = parseFloat($1);
        n += ($2 / 60);
        n = Math.round(n * 1E4) / 1E4;
        return $3 + n;
    });
  // 0.5698W ==> W0.5698
    txt = txt.replace(/(.*)([N|S|E|W]+)$/g, '$2$1');
  // 17.1234 ==> N17.1234
    if (txt && txt.charAt(0) !== neg && txt.charAt(0) !== pos) {
        txt = pos + txt;
    }
    field.value = txt;
}

// This is the default way for webtrees to show image galleries.
// Custom themes may use a different viewer.
function activate_colorbox(config)
{
    $.extend($.colorbox.settings, {
      // Don't scroll window with document
        fixed: true,
        current: '',
        previous: '\uf048',
        next: '\uf051',
        slideshowStart: '\uf04b',
        slideshowStop: '\uf04c',
        close: '\uf00d'
    });
    if (config) {
        $.extend($.colorbox.settings, config);
    }

  // Trigger an event when we click on an (any) image
    $('body').on('click', 'a.gallery', function () {
      // Enable colorbox for images
        $('a[type^=image].gallery').colorbox({
            photo: true,
            maxWidth: '95%',
            maxHeight: '95%',
            rel: 'gallery', // Turn all images on the page into a slideshow
            slideshow: true,
            slideshowAuto: false,
          // Add wheelzoom to the displayed image
            onComplete: function () {
              // Disable click on image triggering next image
              // https://github.com/jackmoore/colorbox/issues/668
                $('.cboxPhoto').unbind('click');

                wheelzoom(document.querySelectorAll('.cboxPhoto'));
            }
        });

      // Enable colorbox for audio using <audio></audio>, where supported
      // $('html.video a[type^=video].gallery').colorbox({
      //  rel:         'nofollow' // Slideshows are just for images
      // });

      // Enable colorbox for video using <video></video>, where supported
      // $('html.audio a[type^=audio].gallery').colorbox({
      //  rel:         'nofollow', // Slideshows are just for images
      // });

      // Allow all other media types remain as download links
    });
}

// Initialize autocomplete elements.
function autocomplete(selector)
{
  // Use typeahead/bloodhound for autocomplete
    $(selector).each(function () {
        let that = this;
        $(this).typeahead(null, {
            display: 'value',
            source: new Bloodhound({
                datumTokenizer: Bloodhound.tokenizers.obj.whitespace('value'),
                queryTokenizer: Bloodhound.tokenizers.whitespace,
                remote: {
                    url: this.dataset.autocompleteUrl,
                    replace: function(url, uriEncodedQuery) {
                        if (that.dataset.autocompleteExtra) {
                            let extra = $(document.querySelector(that.dataset.autocompleteExtra)).val();
                            return url.replace("QUERY",uriEncodedQuery) + '&extra=' + encodeURIComponent(extra)
                        }
                        return url.replace("QUERY",uriEncodedQuery);
                    },
                    wildcard: 'QUERY',

                }
            })
        });
    });
}

/**
 * Insert text at the current cursor position in an input field.
 *
 * @param e The input element.
 * @param t The text to insert.
 */
function insertTextAtCursor(e, t)
{
    var scrollTop = e.scrollTop;
    var selectionStart = e.selectionStart;
    var prefix = e.value.substring(0, selectionStart);
    var suffix = e.value.substring(e.selectionEnd, e.value.length);
    e.value = prefix + t + suffix;
    e.selectionStart = selectionStart + t.length;
    e.selectionEnd = e.selectionStart;
    e.focus();
    e.scrollTop = scrollTop;
}

// Send the CSRF token on all AJAX requests
$.ajaxSetup({
    headers: {
        'X-CSRF-TOKEN': $('meta[name=csrf]').attr('content')
    }
});

// Initialisation
$(function () {
  // Page elements that load automaticaly via AJAX.
  // This prevents bad robots from crawling resource-intensive pages.
    $("[data-ajax-url]").each(function () {
        $(this).load($(this).data('ajaxUrl'));
    });

  // Select2 - format entries in the select list
    function templateOptionForSelect2(data)
    {
        if (data.loading) {
          // If we're waiting for the server, this will be a "waiting..." message
            return data.text;
        } else {
          // The response from the server is already in HTML, so no need to format it here.
            return data.text;
        }
    }

    // Autocomplete
    autocomplete('input[data-autocomplete-url]');

    // Select2 - activate autocomplete fields
    const lang = document.documentElement.lang;
    const select2_languages = {
        'zh-Hans': 'zh-CN',
        'zh-Hant': 'zh-TW',
    };
    $("select.select2").select2({
        language: select2_languages[lang] || lang,
        // Do not escape - we do it on the server.
        escapeMarkup: function (x) {
            return x;
        },
    });

    // If we clear the select (using the "X" button), we need an empty value
    // (rather than no value at all) for (non-multiple) selects with name="array[]"
    $("select.select2:not([multiple])")
    .on("select2:unselect", function (evt) {
        $(evt.delegateTarget).html("<option value=\"\" selected></option>");
    });

    // Datatables - locale aware sorting
    $.fn.dataTableExt.oSort['text-asc'] = function (x, y) {
        return x.localeCompare(y, document.documentElement.lang, {'sensitivity': 'base'});
    };
    $.fn.dataTableExt.oSort['text-desc'] = function (x, y) {
        return y.localeCompare(x, document.documentElement.lang, {'sensitivity': 'base'});
    };

  // DataTables - start hidden to prevent FOUC.
    $('table.datatables').each(function () {
        $(this).DataTable(); $(this).removeClass('d-none'); });

  // Activate the on-screen keyboard
    var osk_focus_element;
    $('.wt-osk-trigger').click(function () {
      // When a user clicks the icon, set focus to the corresponding input
        osk_focus_element = document.getElementById($(this).data('id'));
        osk_focus_element.focus();
        $('.wt-osk').show();

    });

    $('.wt-osk-script-button').change(function () {
        $('.wt-osk-script').prop('hidden', true);
        $('.wt-osk-script-' + $(this).data('script')).prop('hidden', false);
    });
    $('.wt-osk-shift-button').click(function () {
        document.querySelector('.wt-osk-keys').classList.toggle('shifted');
    });
    $('.wt-osk-keys').on('click', '.wt-osk-key', function () {
        var key = $(this).contents().get(0).nodeValue;
        var shift_state = $('.wt-osk-shift-button').hasClass('active');
        var shift_key = $('sup', this)[0];
        if (shift_state && shift_key !== undefined) {
            key = shift_key.innerText;
        }
        if (osk_focus_element !== null) {
            var cursorPos = osk_focus_element.selectionStart;
            var v = osk_focus_element.value;
            var textBefore = v.substring(0, cursorPos);
            var textAfter  = v.substring(cursorPos, v.length);
            osk_focus_element.value = textBefore + key + textAfter;
            if ($('.wt-osk-pin-button').hasClass('active') === false) {
                $('.wt-osk').hide();
            }
        }
    });

    $('.wt-osk-close').on('click', function () {
        $('.wt-osk').hide();
    });
});

// Convert data-confirm and data-post-url attributes into useful behavior.
document.addEventListener("click",  (event) => {
    const target = event.target.closest("a");

    if (target === null) {
        return;
    }

    if ("confirm" in target.dataset && !confirm(target.dataset.confirm)) {
        event.preventDefault();
        return;
    }

    if ("postUrl" in target.dataset) {
        let request = new XMLHttpRequest();
        let token   = document.querySelector("meta[name=csrf]").content;
        request.open("POST", target.dataset.postUrl, true);
        request.setRequestHeader("X-CSRF-TOKEN", token);
        request.onreadystatechange = () => {
            if (request.readyState === request.DONE) {
                document.location.reload();
            }
        };
        request.send();
        event.preventDefault();
    }
});