/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.uri.Uri");

dojo.uri = new function() {
	this.dojoUri = function (/*dojo.uri.Uri||String*/uri) {
		// summary: returns a Uri object resolved relative to the dojo root
		return new dojo.uri.Uri(dojo.hostenv.getBaseScriptUri(), uri);
	}
	
	this.moduleUri = function(/*String*/module, /*dojo.uri.Uri||String*/uri){
		// summary: returns a Uri object relative to a (top-level) module
		// description: Examples: dojo.uri.moduleUri("dojo","Editor"), or dojo.uri.moduleUri("acme","someWidget")
		var loc = dojo.hostenv.getModulePrefix(module);
		if(!loc){return null;}
		if(loc.lastIndexOf("/") != loc.length-1){loc += "/";}
		return new dojo.uri.Uri(dojo.hostenv.getBaseScriptUri()+loc,uri);
	}

	this.Uri = function (/*dojo.uri.Uri||String...*/) {
		// summary: Constructor to create an object representing a URI.
		// description: 
		//  Each argument is evaluated in order relative to the next until
		//  a canonical uri is produced. To get an absolute Uri relative
		//  to the current document use
		//      new dojo.uri.Uri(document.baseURI, uri)

		// TODO: support for IPv6, see RFC 2732

		// resolve uri components relative to each other
		var uri = arguments[0];
		for (var i = 1; i < arguments.length; i++) {
			if(!arguments[i]) { continue; }

			// Safari doesn't support this.constructor so we have to be explicit
			var relobj = new dojo.uri.Uri(arguments[i].toString());
			var uriobj = new dojo.uri.Uri(uri.toString());

			if ((relobj.path=="")&&(relobj.scheme==null)&&(relobj.authority==null)&&(relobj.query==null)) {
				if (relobj.fragment != null) { uriobj.fragment = relobj.fragment; }
				relobj = uriobj;
			} else if (relobj.scheme == null) {
				relobj.scheme = uriobj.scheme;
			
				if (relobj.authority == null) {
					relobj.authority = uriobj.authority;
					
					if (relobj.path.charAt(0) != "/") {
						var path = uriobj.path.substring(0,
							uriobj.path.lastIndexOf("/") + 1) + relobj.path;

						var segs = path.split("/");
						for (var j = 0; j < segs.length; j++) {
							if (segs[j] == ".") {
								if (j == segs.length - 1) { segs[j] = ""; }
								else { segs.splice(j, 1); j--; }
							} else if (j > 0 && !(j == 1 && segs[0] == "") &&
								segs[j] == ".." && segs[j-1] != "..") {

								if (j == segs.length - 1) { segs.splice(j, 1); segs[j - 1] = ""; }
								else { segs.splice(j - 1, 2); j -= 2; }
							}
						}
						relobj.path = segs.join("/");
					}
				}
			}

			uri = "";
			if (relobj.scheme != null) { uri += relobj.scheme + ":"; }
			if (relobj.authority != null) { uri += "//" + relobj.authority; }
			uri += relobj.path;
			if (relobj.query != null) { uri += "?" + relobj.query; }
			if (relobj.fragment != null) { uri += "#" + relobj.fragment; }
		}

		this.uri = uri.toString();

		// break the uri into its main components
		var regexp = "^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?$";
	  var r = this.uri.match(new RegExp(regexp));

		this.scheme = r[2] || (r[1] ? "" : null);
		this.authority = r[4] || (r[3] ? "" : null);
		this.path = r[5]; // can never be undefined
		this.query = r[7] || (r[6] ? "" : null);
		this.fragment  = r[9] || (r[8] ? "" : null);
		
		if (this.authority != null) {
			// server based naming authority
			regexp = "^((([^:]+:)?([^@]+))@)?([^:]*)(:([0-9]+))?$";
			r = this.authority.match(new RegExp(regexp));
			
			this.user = r[3] || null;
			this.password = r[4] || null;
			this.host = r[5];
			this.port = r[7] || null;
		}
	
		this.toString = function(){ return this.uri; }
	}
};
