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/**
 * @fileoverview    functions used in GIS data editor
 *
 * @requires    jQuery
 *
 */

/* global addZoomPanControllers, storeGisSvgRef, selectVisualization, styleOSM, zoomAndPan */ // js/table/gis_visualization.js
/* global themeImagePath */ // templates/javascript/variables.twig

// eslint-disable-next-line no-unused-vars
var gisEditorLoaded = false;

/**
 * Closes the GIS data editor and perform necessary clean up work.
 */
function closeGISEditor () {
    $('#popup_background').fadeOut('fast');
    $('#gis_editor').fadeOut('fast', function () {
        $(this).empty();
    });
}

/**
 * Prepares the HTML received via AJAX.
 */
function prepareJSVersion () {
    // Change the text on the submit button
    $('#gis_editor').find('input[name=\'gis_data[save]\']')
        .val(Messages.strCopy)
        .insertAfter($('#gis_data_textarea'))
        .before('<br><br>');

// Add close and cancel links
    $('#gis_data_editor').prepend('<a class="close_gis_editor" href="#">' + Messages.strClose + '</a>');
    $('<a class="cancel_gis_editor" href="#"> ' + Messages.strCancel + '</a>')
        .insertAfter($('input[name=\'gis_data[save]\']'));

// Remove the unnecessary text
    $('div#gis_data_output p').remove();

// Remove 'add' buttons and add links
    $('#gis_editor').find('input.add').each(function () {
        var $button = $(this);
        $button.addClass('addJs').removeClass('add');
        var classes = $button.attr('class');
        $button.replaceWith(
            '<a class="' + classes +
            '" name="' + $button.attr('name') +
            '" href="#">+ ' + $button.val() + '</a>'
        );
    });
}

/**
 * Returns the HTML for a data point.
 *
 * @param {number} pointNumber point number
 * @param {string} prefix      prefix of the name
 * @return {string} the HTML for a data point
 */
function addDataPoint (pointNumber, prefix) {
    return '<br>' +
        Functions.sprintf(Messages.strPointN, (pointNumber + 1)) + ': ' +
        '<label for="x">' + Messages.strX + '</label>' +
        '<input type="text" name="' + prefix + '[' + pointNumber + '][x]" value="">' +
        '<label for="y">' + Messages.strY + '</label>' +
        '<input type="text" name="' + prefix + '[' + pointNumber + '][y]" value="">';
}

/**
 * Initialize the visualization in the GIS data editor.
 */
function initGISEditorVisualization () {
    storeGisSvgRef();
    // Loads either SVG or OSM visualization based on the choice
    selectVisualization();
    // Adds necessary styles to the div that contains the openStreetMap
    styleOSM();
    // Adds controllers for zooming and panning
    addZoomPanControllers();
    zoomAndPan();
}

/**
 * Loads JavaScript files and the GIS editor.
 *
 * @param value      current value of the geometry field
 * @param field      field name
 * @param type       geometry type
 * @param inputName name of the input field
 * @param token      token
 */
// eslint-disable-next-line no-unused-vars
function loadJSAndGISEditor (value, field, type, inputName) {
    var head = document.getElementsByTagName('head')[0];
    var script;

script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = 'js/dist/table/gis_visualization.js';
    head.appendChild(script);

// OpenLayers.js is BIG and takes time. So asynchronous loading would not work.
    // Load the JS and do a callback to load the content for the GIS Editor.
    script = document.createElement('script');
    script.type = 'text/javascript';

script.onreadystatechange = function () {
        if (this.readyState === 'complete') {
            loadGISEditor(value, field, type, inputName);
        }
    };
    script.onload = function () {
        loadGISEditor(value, field, type, inputName);
    };
    script.onerror = function () {
        loadGISEditor(value, field, type, inputName);
    };

script.src = 'js/vendor/openlayers/OpenLayers.js';
    head.appendChild(script);

gisEditorLoaded = true;
}

/**
 * Loads the GIS editor via AJAX
 *
 * @param value      current value of the geometry field
 * @param field      field name
 * @param type       geometry type
 * @param inputName name of the input field
 */
function loadGISEditor (value, field, type, inputName) {
    var $gisEditor = $('#gis_editor');
    $.post('index.php?route=/gis-data-editor', {
        'field' : field,
        'value' : value,
        'type' : type,
        'input_name' : inputName,
        'get_gis_editor' : true,
        'ajax_request': true,
        'server': CommonParams.get('server')
    }, function (data) {
        if (typeof data !== 'undefined' && data.success === true) {
            $gisEditor.html(data.gis_editor);
            initGISEditorVisualization();
            prepareJSVersion();
        } else {
            Functions.ajaxShowMessage(data.error, false);
        }
    }, 'json');
}

/**
 * Opens up the dialog for the GIS data editor.
 */
// eslint-disable-next-line no-unused-vars
function openGISEditor () {
    // Center the popup
    var windowWidth = document.documentElement.clientWidth;
    var windowHeight = document.documentElement.clientHeight;
    var popupWidth = windowWidth * 0.9;
    var popupHeight = windowHeight * 0.9;
    var popupOffsetTop = windowHeight / 2 - popupHeight / 2;
    var popupOffsetLeft = windowWidth / 2 - popupWidth / 2;

var $gisEditor = $('#gis_editor');
    var $background = $('#popup_background');

$gisEditor.css({ 'top': popupOffsetTop, 'left': popupOffsetLeft, 'width': popupWidth, 'height': popupHeight });
    $background.css({ 'opacity' : '0.7' });

$gisEditor.append(
        '<div id="gis_data_editor">' +
        '<img class="ajaxIcon" id="loadingMonitorIcon" src="' +
        themeImagePath + 'ajax_clock_small.gif" alt="">' +
        '</div>'
    );

// Make it appear
    $background.fadeIn('fast');
    $gisEditor.fadeIn('fast');
}

/**
 * Prepare and insert the GIS data in Well Known Text format
 * to the input field.
 */
function insertDataAndClose () {
    var $form = $('form#gis_data_editor_form');
    var inputName = $form.find('input[name=\'input_name\']').val();

/**
 * Unbind all event handlers before tearing down a page
 */
AJAX.registerTeardown('gis_data_editor.js', function () {
    $(document).off('click', '#gis_editor input[name=\'gis_data[save]\']');
    $(document).off('submit', '#gis_editor');
    $(document).off('change', '#gis_editor input[type=\'text\']');
    $(document).off('change', '#gis_editor select.gis_type');
    $(document).off('click', '#gis_editor a.close_gis_editor, #gis_editor a.cancel_gis_editor');
    $(document).off('click', '#gis_editor a.addJs.addPoint');
    $(document).off('click', '#gis_editor a.addLine.addJs');
    $(document).off('click', '#gis_editor a.addJs.addPolygon');
    $(document).off('click', '#gis_editor a.addJs.addGeom');
});

AJAX.registerOnload('gis_data_editor.js', function () {
    /**
     * Prepares and insert the GIS data to the input field on clicking 'copy'.
     */
    $(document).on('click', '#gis_editor input[name=\'gis_data[save]\']', function (event) {
        event.preventDefault();
        insertDataAndClose();
    });

/**
     * Prepares and insert the GIS data to the input field on pressing 'enter'.
     */
    $(document).on('submit', '#gis_editor', function (event) {
        event.preventDefault();
        insertDataAndClose();
    });

/**
     * Trigger asynchronous calls on data change and update the output.
     */
    $(document).on('change', '#gis_editor input[type=\'text\']', function () {
        var $form = $('form#gis_data_editor_form');
        var argsep = CommonParams.get('arg_separator');
        $.post('index.php?route=/gis-data-editor', $form.serialize() + argsep + 'generate=true' + argsep + 'ajax_request=true', function (data) {
            if (typeof data !== 'undefined' && data.success === true) {
                $('#gis_data_textarea').val(data.result);
                $('#placeholder').empty().removeClass('hasSVG').html(data.visualization);
                $('#openlayersmap').empty();
                /* TODO: the gis_data_editor should rather return JSON than JS code to eval */
                // eslint-disable-next-line no-eval
                eval(data.openLayers);
                initGISEditorVisualization();
            } else {
                Functions.ajaxShowMessage(data.error, false);
            }
        }, 'json');
    });

/**
     * Update the form on change of the GIS type.
     */
    $(document).on('change', '#gis_editor select.gis_type', function () {
        var $gisEditor = $('#gis_editor');
        var $form = $('form#gis_data_editor_form');

/**
     * Handles closing of the GIS data editor.
     */
    $(document).on('click', '#gis_editor a.close_gis_editor, #gis_editor a.cancel_gis_editor', function () {
        closeGISEditor();
    });

/**
     * Handles adding data points
     */
    $(document).on('click', '#gis_editor a.addJs.addPoint', function () {
        var $a = $(this);
        var name = $a.attr('name');
        // Eg. name = gis_data[0][MULTIPOINT][add_point] => prefix = gis_data[0][MULTIPOINT]
        var prefix = name.substr(0, name.length - 11);
        // Find the number of points
        var $noOfPointsInput = $('input[name=\'' + prefix + '[no_of_points]' + '\']');
        var noOfPoints = parseInt($noOfPointsInput.val(), 10);
        // Add the new data point
        var html = addDataPoint(noOfPoints, prefix);
        $a.before(html);
        $noOfPointsInput.val(noOfPoints + 1);
    });

/**
     * Handles adding linestrings and inner rings
     */
    $(document).on('click', '#gis_editor a.addLine.addJs', function () {
        var $a = $(this);
        var name = $a.attr('name');

// Eg. name = gis_data[0][MULTILINESTRING][add_line] => prefix = gis_data[0][MULTILINESTRING]
        var prefix = name.substr(0, name.length - 10);
        var type = prefix.slice(prefix.lastIndexOf('[') + 1, prefix.lastIndexOf(']'));

// Find the number of lines
        var $noOfLinesInput = $('input[name=\'' + prefix + '[no_of_lines]' + '\']');
        var noOfLines = parseInt($noOfLinesInput.val(), 10);

// Add the new linesting of inner ring based on the type
        var html = '<br>';
        var noOfPoints;
        if (type === 'MULTILINESTRING') {
            html += Messages.strLineString + ' ' + (noOfLines + 1) + ':';
            noOfPoints = 2;
        } else {
            html += Messages.strInnerRing + ' ' + noOfLines + ':';
            noOfPoints = 4;
        }
        html += '<input type="hidden" name="' + prefix + '[' + noOfLines + '][no_of_points]" value="' + noOfPoints + '">';
        for (var i = 0; i < noOfPoints; i++) {
            html += addDataPoint(i, (prefix + '[' + noOfLines + ']'));
        }
        html += '<a class="addPoint addJs" name="' + prefix + '[' + noOfLines + '][add_point]" href="#">+ ' +
            Messages.strAddPoint + '</a><br>';

$a.before(html);
        $noOfLinesInput.val(noOfLines + 1);
    });

/**
     * Handles adding polygons
     */
    $(document).on('click', '#gis_editor a.addJs.addPolygon', function () {
        var $a = $(this);
        var name = $a.attr('name');
        // Eg. name = gis_data[0][MULTIPOLYGON][add_polygon] => prefix = gis_data[0][MULTIPOLYGON]
        var prefix = name.substr(0, name.length - 13);
        // Find the number of polygons
        var $noOfPolygonsInput = $('input[name=\'' + prefix + '[no_of_polygons]' + '\']');
        var noOfPolygons = parseInt($noOfPolygonsInput.val(), 10);

// Add the new polygon
        var html = Messages.strPolygon + ' ' + (noOfPolygons + 1) + ':<br>';
        html += '<input type="hidden" name="' + prefix + '[' + noOfPolygons + '][no_of_lines]" value="1">' +
            '<br>' + Messages.strOuterRing + ':' +
            '<input type="hidden" name="' + prefix + '[' + noOfPolygons + '][0][no_of_points]" value="4">';
        for (var i = 0; i < 4; i++) {
            html += addDataPoint(i, (prefix + '[' + noOfPolygons + '][0]'));
        }
        html += '<a class="addPoint addJs" name="' + prefix + '[' + noOfPolygons + '][0][add_point]" href="#">+ ' +
            Messages.strAddPoint + '</a><br>' +
            '<a class="addLine addJs" name="' + prefix + '[' + noOfPolygons + '][add_line]" href="#">+ ' +
            Messages.strAddInnerRing + '</a><br><br>';

$a.before(html);
        $noOfPolygonsInput.val(noOfPolygons + 1);
    });

/**
     * Handles adding geoms
     */
    $(document).on('click', '#gis_editor a.addJs.addGeom', function () {
        var $a = $(this);
        var prefix = 'gis_data[GEOMETRYCOLLECTION]';
        // Find the number of geoms
        var $noOfGeomsInput = $('input[name=\'' + prefix + '[geom_count]' + '\']');
        var noOfGeoms = parseInt($noOfGeomsInput.val(), 10);

var html1 = Messages.strGeometry + ' ' + (noOfGeoms + 1) + ':<br>';
        var $geomType = $('select[name=\'gis_data[' + (noOfGeoms - 1) + '][gis_type]\']').clone();
        $geomType.attr('name', 'gis_data[' + noOfGeoms + '][gis_type]').val('POINT');
        var html2 = '<br>' + Messages.strPoint + ' :' +
            '<label for="x"> ' + Messages.strX + ' </label>' +
            '<input type="text" name="gis_data[' + noOfGeoms + '][POINT][x]" value="">' +
            '<label for="y"> ' + Messages.strY + ' </label>' +
            '<input type="text" name="gis_data[' + noOfGeoms + '][POINT][y]" value="">' +
            '<br><br>';

$a.before(html1);
        $geomType.insertBefore($a);
        $a.before(html2);
        $noOfGeomsInput.val(noOfGeoms + 1);
    });
});

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