/*
 * Copyright (c) 2008-2010 Institut Geographique National France, released under the
 * BSD license.
 */

(function() {
    /**
     * Before creating the Geoportal namespace, check to see if
     * Geoportal.singleFile is true.  This occurs if the
     * Geoportail/SingleFile.js script is included before this one - as is the
     * case with single file builds.
     *
     */
    var singleFile = (typeof(Geoportal)=="object" && Geoportal.singleFile);

    /**
     * Namespace: Geoportal
     * The Geoportal API based on OpenLayers 2.8.
     * The Geoportal object provides a namespace for all things Geoportal
     */
    window.Geoportal = {

        /**
         * Property: _scriptName
         * {String} Relative path of this script.
         */
        _scriptName: (!singleFile) ? "lib/GeoportalMin.js" : "GeoportalMin.js",

        /**
         * Property: _scriptLocation
         * {String} Path of this script.
         */
        _scriptLocation: null,

        /**
         * Function: _getScriptLocation
         * Return the path to this script.
         *
         * Returns:
         * {String} Path to this script
         */
        _getScriptLocation: function () {
            if(Geoportal._scriptLocation) { return Geoportal._scriptLocation; }
            var scriptName= Geoportal._scriptName;
            var scriptNameLen= scriptName.length;

            // From GeoExt :
            // If we load other scripts right before Geoportal using the same
            // mechanism to add script resources dynamically (e.g. OpenLayers),
            // document.getElementsByTagName will not find the GeoExt script tag
            // in FF2. Using document.documentElement.getElementsByTagName instead
            // works around this issue.
            var scripts= document.documentElement.getElementsByTagName('script');
            for (var i= 0; i < scripts.length; i++) {
                var src= scripts[i].getAttribute('src');
                if (src) {
                    var index= src.lastIndexOf(scriptName);
                    // set path length for src up to a query string
                    var pathLength= src.lastIndexOf('?');
                    if (pathLength < 0) {
                        pathLength= src.length;
                    }
                    // is it found, at the end of the URL?
                    if ((index > -1) && (index + scriptNameLen == pathLength)) {
                        Geoportal._scriptLocation= src.slice(0, -scriptNameLen);
                        break;
                    }
                }
            }
            return Geoportal._scriptLocation||"";
         }
    };
    /**
     * Geoportal.singleFile is a flag indicating this file is being included
     * in a Single File Library build of the Geoportal Library.
     *
     * When we are *not* part of a SFL build we dynamically include the
     * Geoportal library code.
     *
     * When we *are* part of a SFL build we do not dynamically include the
     * Geoportal library code as it will be appended at the end of this file.
     */
    if(!singleFile) {
        var jsfiles = [
            // PROJ4JS:
            "../../proj4js/lib/proj4js.js",
            "../../proj4js/lib/OverloadedProj4js.js",
            // GEOPORTAL:
            "OpenLayers/OverloadedOpenLayersMinimum.js",
            "Geoportal/Catalogue.js",
            "Geoportal/Control.js",
            "Geoportal/Lang.js",
            "Geoportal/Lang/en.js",
            "Geoportal/Lang/fr.js",
            "Geoportal/Lang/de.js",
            "Geoportal/Lang/es.js",
            "Geoportal/Lang/it.js",
            "Geoportal/Layer.js",
            "Geoportal/Tile.js",
            "Geoportal/Util.js",
            "Geoportal/Control/PermanentLogo.js",
            "Geoportal/Control/TermsOfService.js",
            "Geoportal/GeoRMHandler.js",
            "Geoportal/Layer/Grid.js",
            "Geoportal/Layer/WFS.js",
            "Geoportal/Layer/WMS.js",
            "Geoportal/Layer/WMSC.js",
            "Geoportal/Tile/Image.js"
        ]; // etc.

        var agent= navigator.userAgent;
        var docWrite= (agent.match("MSIE") || agent.match("Safari"));
        if(docWrite) {
            var allScriptTags= new Array(jsfiles.length);
        } else {
            var h= document.getElementsByTagName("head").length ?
                    document.getElementsByTagName("head")[0] :
                    document.body;
            if (!h) {
                alert('no head and body to include the JavaScript API.');
                return;
            }
        }
        var host= Geoportal._getScriptLocation() + "lib/";
        for (var i= 0, len= jsfiles.length; i < len; i++) {
            if(docWrite) {
                allScriptTags[i]= "<script" +
                                    " type='text/javascript'" +
                                    " src='" + host + jsfiles[i] + "'" +
                                    " charset='UTF-8'" +
                                  "></script>";
            } else {
                if(h) {
                    var s= document.createElement("script");
                    s.src= host + jsfiles[i];
                    s.charset= "UTF-8";
                    s.type= "text/javascript";
                    h.appendChild(s);
                }
            }
        }
        if(docWrite) {
            document.write(allScriptTags.join(""));
        }
    }
})();

/**
 * Constant: VERSION_NUMBER
 * {String} *"1.0"*
 */
Geoportal.VERSION_NUMBER="1.0";