/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * @fileoverview    functions used in GIS data editor
 *
 * @requires    jQuery
 *
 */

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

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

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

    // Remove 'add' buttons and add links
    $('#gis_editor input.add').each(function (e) {
        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 pointNumber point number
 * @param prefix      prefix of the name
 * @returns the HTML for a data point
 */
function addDataPoint(pointNumber, prefix) {
    return '<br/>' +
        $.sprintf(PMA_messages.strPointN, (pointNumber + 1)) + ': ' +
        '<label for="x">' + PMA_messages.strX + '</label>' +
        '<input type="text" name="' + prefix + '[' + pointNumber + '][x]" value=""/>' +
        '<label for="y">' + PMA_messages.strY + '</label>' +
        '<input type="text" name="' + prefix + '[' + pointNumber + '][y]" value=""/>';
}

/**
 * Initialize the visualization in the GIS data editor.
 */
function initGISEditorVisualization() {
    // Loads either SVG or OSM visualization based on the choice
    selectVisualization();
    // Adds necessary styles to the div that coontains the openStreetMap
    styleOSM();
    // Loads the SVG element and make a reference to it
    loadSVG();
    // 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 input_name name of the input field
 * @param token      token
 */
function loadJSAndGISEditor(value, field, type, input_name, token) {
    var head = document.getElementsByTagName('head')[0];
    var script;

    // Loads a set of small JS file needed for the GIS editor
    var smallScripts = [ 'js/jquery/jquery.svg.js',
                     'js/jquery/jquery.mousewheel.js',
                     'js/jquery/jquery.event.drag-2.2.js',
                     'js/tbl_gis_visualization.js' ];

    for (var i = 0; i < smallScripts.length; i++) {
        script = document.createElement('script');
        script.type = 'text/javascript';
        script.src = smallScripts[i];
        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, input_name, token);
        }
    };
    script.onload = function () {
        loadGISEditor(value, field, type, input_name, token);
    };

    script.src = 'js/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 input_name name of the input field
 * @param token      token
 */
function loadGISEditor(value, field, type, input_name, token) {

    var $gis_editor = $("#gis_editor");
    $.post('gis_data_editor.php', {
        'field' : field,
        'value' : value,
        'type' : type,
        'input_name' : input_name,
        'get_gis_editor' : true,
        'token' : token,
        'ajax_request': true
    }, function (data) {
        if (data.success === true) {
            $gis_editor.html(data.gis_editor);
            initGISEditorVisualization();
            prepareJSVersion();
        } else {
            PMA_ajaxShowMessage(data.error, false);
        }
    }, 'json');
}

/**
 * Opens up the dialog for the GIS data editor.
 */
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 $gis_editor = $("#gis_editor");
    var $backgrouond = $("#popup_background");

    $gis_editor.css({"top": popupOffsetTop, "left": popupOffsetLeft, "width": popupWidth, "height": popupHeight});
    $backgrouond.css({"opacity" : "0.7"});

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

    // Make it appear
    $backgrouond.fadeIn("fast");
    $gis_editor.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 input_name = $form.find("input[name='input_name']").val();

    $.post('gis_data_editor.php', $form.serialize() + "&generate=true&ajax_request=true", function (data) {
        if (data.success === true) {
            $("input[name='" + input_name + "']").val(data.result);
        } else {
            PMA_ajaxShowMessage(data.error, false);
        }
    }, 'json');
    closeGISEditor();
}

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

AJAX.registerOnload('gis_data_editor.js', function () {

    // Remove the class that is added due to the URL being too long.
    $('span.open_gis_editor a').removeClass('formLinkSubmit');

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

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

    /**
     * Trigger asynchronous calls on data change and update the output.
     */
    $('#gis_editor').find("input[type='text']").live('change', function () {
        var $form = $('form#gis_data_editor_form');
        $.post('gis_data_editor.php', $form.serialize() + "&generate=true&ajax_request=true", function (data) {
            if (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 */
                eval(data.openLayers);
                initGISEditorVisualization();
            } else {
                PMA_ajaxShowMessage(data.error, false);
            }
        }, 'json');
    });

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

        $.post('gis_data_editor.php', $form.serialize() + "&get_gis_editor=true&ajax_request=true", function (data) {
            if (data.success === true) {
                $gis_editor.html(data.gis_editor);
                initGISEditorVisualization();
                prepareJSVersion();
            } else {
                PMA_ajaxShowMessage(data.error, false);
            }
        }, 'json');
    });

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

    /**
     * Handles adding data points
     */
    $('#gis_editor a.addJs.addPoint').live('click', 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
     */
    $('#gis_editor a.addLine.addJs').live('click', 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 += PMA_messages.strLineString + ' ' + (noOfLines + 1) + ':';
            noOfPoints = 2;
        } else {
            html += PMA_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="#">+ ' +
            PMA_messages.strAddPoint + '</a><br/>';

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

    /**
     * Handles adding polygons
     */
    $('#gis_editor a.addJs.addPolygon').live('click', 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 = PMA_messages.strPolygon + ' ' + (noOfPolygons + 1) + ':<br/>';
        html += '<input type="hidden" name="' + prefix + '[' + noOfPolygons + '][no_of_lines]" value="1"/>' +
            '<br/>' + PMA_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="#">+ ' +
            PMA_messages.strAddPoint + '</a><br/>' +
            '<a class="addLine addJs" name="' + prefix + '[' + noOfPolygons + '][add_line]" href="#">+ ' +
            PMA_messages.strAddInnerRing + '</a><br/><br/>';

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

    /**
     * Handles adding geoms
     */
    $('#gis_editor a.addJs.addGeom').live('click', 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 = PMA_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/>' + PMA_messages.strPoint + ' :' +
            '<label for="x"> ' + PMA_messages.strX + ' </label>' +
            '<input type="text" name="gis_data[' + noOfGeoms + '][POINT][x]" value=""/>' +
            '<label for="y"> ' + PMA_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);
    });
});
