//
//  Adds a link to Google maps to show geocaches around the map centre.
//  Based on an idea by Josh Gunnar.
//  (C) Copyright 2006-2011 James Inge.  Licensed under the MIT License
//
//	v0.10 - Moved to Google menu, due to another layout change.
//	v0.9	- Updated to match change in Google Maps layout. New icon.
//	v0.8	- Updated to use the new Geocaching Maps, also now preserves zoom level.
//	v0.7	- Now works with any top-level domain version of Google Maps thanks to Draussencacher.
//	v0.3 to 0.6	- Updates to match various minor changes in Google Maps' page structure.
//		- No changes in functionality.
//	v0.2	- Updated to match change in Google Maps layout
//

// ==UserScript==
// @name	Google Maps Show Geocaches Link
// @namespace	http://inge.org.uk/userscripts
// @description	Creates a link on Google Maps to switch to the geocache map search on Geocaching.com.
// @include	http://maps.google.tld/*
// @include	http://www.google.tld/local*
// @include	http://www.google.tld/maps*
// @license	MIT License; http://www.opensource.org/licenses/mit-license.php
// @copyright	2006-2011, James Inge (http://geo.inge.org.uk/greasemonkey.htm)
// @version 0.10
// ==/UserScript==

function addGeoLink() {
	var menuItem = "<a class='gbmt' title='Show geocaches around the map centre' onclick='document.location=\"http://coord.info/map?ll=\"+gApplication.getMap().getCenter().lat()+\",\"+gApplication.getMap().getCenter().lng()+gApplication.getPageUrl().match(/&z=\\d*/);' id='gb_jri_showgeocaches'>Show geocaches</a>";
	var geoMenu = document.getElementById("gb_jri_geomenu");
	if( geoMenu ) {
		// Menu already added by another script, so just add an entry
		var newMenuItem = document.createElement('li');
		newMenuItem.className = 'gbmtc';
		newMenuItem.innerHTML = menuItem;
		geoMenu.appendChild(newMenuItem);
	} else {
		// Set up the menu from scratch
		var targets = document.evaluate("//div[@id='gbz']/ol", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
		if (targets.snapshotLength > 0) {
			var menuTarget = targets.snapshotItem(0);
			var newGeoMenu = document.createElement('li');
			newGeoMenu.className = 'gbt';
			newGeoMenu.innerHTML = [
				'<a class="gbgt" id="gbztm_jri" href="http://www.google.com/intl/en/options/" onclick="gbar.tg(event,this)" aria-haspopup="true" aria-owns="gb_jri">\
					<span class="gbtb2"></span>\
					<span id="gbztms_jri" class="gbts gbtsa">\
						<span id="gbztms_jri1">Geo</span>\
						<span class="gbma"></span>\
					</span>\
				</a>\
				<div aria-owner="gbztm_jri" id="gb_jri" class="gbm" style="visibility: hidden;">\
					<div class="gbmc">\
						<ol class="gbmcc" id="gb_jri_geomenu">\
							<li class="gbmtc">',
							menuItem,
							'</li>\
						</ol>\
					</div>\
				</div>'
			].join('');
			menuTarget.appendChild(newGeoMenu);
		}
	}
}

addGeoLink();