/*
Geocaching Quick Hint Decoding - v1.2 2010-01-22
(c) 2010, Prime Suspect Software

Greasemonkey user script: see http://greasemonkey.mozdev.org

Compatible with Greasemonkey 0.6.4.

 Decodes hint without reloading cache page. Does not reveal any
 encoded spoilers in logs.

Change Log:

* (v1.2) 2010-01-22 Update for site changes. 

* (v1.1) 2008-07-26 Updated for current site configuration.

* (v1.0) 2005-12-19 Initial release.

*/

// ==UserScript==

// @name            GC Quick Hint
// @description     GC Quick Hint Decoding v1.2
// @namespace       http://gmscripts.locusprime.net/
// @include         http://www.geocaching.com/seek/cache_details.aspx*

// ==/UserScript==


	//  Reassign decrypt link to perform decryption, instead of reloading page.
	var e_Encrypt = document.getElementById("ctl00_ContentBody_Encrypt");
	if (e_Encrypt.href != '') {
		e_Encrypt.href = 'javascript:void(0)';
		e_Encrypt.addEventListener("click", rot13, true);
	}


// ------------------------- Functions ------------------------- //


	function rot13() {
		
		//  ROT13 decoding string.
		var xlr13 = 'abcdefghijklmnopqrstuvwxyzabcdefghijklm' + 
				'ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLM'

		//  Plaintext flag.
		var pt = false;
	
		//  Toggle link label.
		var label = this.firstChild.data;
		if (label == 'Encrypt') {
			label = 'Decrypt';
		} else if (label == 'Decrypt') {
			label = 'Encrypt';
		}
		this.firstChild.data = label;

		//  Get each hint line, and perform ROT13 encoding.
		var e_Hints = document.getElementById("ctl00_ContentBody_Hints");
		var xPathSearch = ".//text()";
		var SpanList = document.evaluate(
				xPathSearch, 
				e_Hints, 
				null, 
				XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, 
				null);
				
		var ic = SpanList.snapshotLength;		
		for (var i = 0; i < ic; i++) {
			xItem = SpanList.snapshotItem(i);
			var line = xItem.data;
			var kc = line.length;
			var r13line = '';
			for (var k = 0; k < kc; k++) {
				c = line.charAt(k);
				if (c == '[') {
					pt = true;
				} else if (c == ']') {
					pt = false;
				} else {
					var idx = xlr13.indexOf(c);
					if (idx >= 0 && !pt) {
						c = xlr13.charAt(idx + 13);
					}
				}
				r13line += c;
			}
			xItem.data = r13line;
		}
	}