// ==UserScript==
// @name          phpBB ignore users
// @description   Ignore posts by users you don't like on phpBB boards
// @namespace     http://www.mrphlip.com/
// @include       */viewtopic.php?*
// ==/UserScript==

// Note: these images are made from the subSilver SDK, which is
// Copyright  2001 phpBB Group and is for non-commercial use only.
ignorebutton = 
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unignorebutton =
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viewbutton =
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ignoreListStr = GM_getValue(location.hostname, "").split(':');
ignoreList = new Array();
for (i = 0; i < ignoreListStr.length; i++)
{
	a = parseInt(ignoreListStr[i], 10);
	if (!isNaN(a))
		ignoreList.push(a);
}

posts = new Array();

profileLinksXPath = document.evaluate("//a[contains(@href,'profile.php?mode=viewprofile')]", document, null, XPathResult.ANY_TYPE, null);
// manipulating the DOM invalidates the XPath, so iterate through it first
profileLinks = new Array();
while (i = profileLinksXPath.iterateNext())
	profileLinks.push(i);
for (i = 0; i < profileLinks.length; i++)
{
	matches = profileLinks[i].href.match(/u=(\d+)/);
	if (!matches) continue;
	post = new Object;
	post.uid = parseInt(matches[1], 10);
	post.tr2 = profileLinks[i];
	// the link is wrapped in its own table, so find that, then find the row of the main table it's in
	// (yay for using tables for layouts...)
	while (post.tr2 && post.tr2.nodeName.toLowerCase() != "table")
		post.tr2 = post.tr2.parentNode;
	while (post.tr2 && post.tr2.nodeName.toLowerCase() != "tr")
		post.tr2 = post.tr2.parentNode;
	if (!post.tr2) continue;
	post.tr1 = post.tr2.previousSibling;
	while (post.tr1 && post.tr1.nodeName.toLowerCase() != "tr")
		post.tr1 = post.tr1.previousSibling;
	if (!post.tr1) continue;
	// get the post number -- avoid counting a post twice
	postlink = document.evaluate(".//a[contains(@href,'viewtopic.php?p=')]", post.tr1, null, XPathResult.ANY_TYPE, null).iterateNext();
	if (!postlink) continue;
	matches = postlink.href.match(/p=(\d+)/);
	if (!matches) continue;
	post.pid = parseInt(matches[1], 10);
	if (posts[post.pid]) continue;
	posts[post.pid] = post;
	// get the user's name
	username = document.evaluate(".//span[@class='name']//b//child::text()", post.tr1, null, XPathResult.ANY_TYPE, null).iterateNext();
	if (!username) continue;
	post.username = username.nodeValue;
	
	profileLinks[i].parentNode.appendChild(document.createTextNode(' '));
	post.ignorelink = document.createElement('img');
	post.ignorelink.style.cursor = "pointer";
	profileLinks[i].parentNode.appendChild(post.ignorelink);
	// this hideous construction will make a closure to call toggleIgnore with the appropriate uid
	post.ignorelink.addEventListener('click', (function (uid){return function(){toggleIgnore(uid)}})(post.uid), false);
	
	post.ignored = (ignoreList.indexOf(post.uid) >= 0);
	if (post.ignored)
	{
		post.ignorelink.src = unignorebutton;
		post.ignorelink.alt = post.ignorelink.title = "Stop hiding posts from " + post.username
		hidePost(post);
	}
	else
	{
		post.ignorelink.src = ignorebutton;
		post.ignorelink.alt = post.ignorelink.title = "Hide posts from " + post.username
	}
}

function hidePost(post)
{
	if (!post.placeholder)
	{
		post.placeholder = document.createElement('tr');
		post.placeholder.id = post.pid;
		td = document.createElement('td');
		post.placeholder.appendChild(td);
		td.colSpan = 2;
		td.className = post.tr1.getElementsByTagName('td')[0].className;
		td.style.padding = "0.2em 1em";
		td.style.font = "italic 12px sans-serif";
		td.appendChild(document.createTextNode("A post by " + post.username + " "));
		img = document.createElement('img');
		img.src = viewbutton;
		img.alt = img.title = "Show this post";
		img.style.marginLeft = "10px";
		img.style.cursor = "pointer";
		td.appendChild(img);
		img.addEventListener('click', function(){showPost(post)}, false);
		post.tr1.parentNode.insertBefore(post.placeholder, post.tr1);
	}
	post.tr1.style.display = "none";
	post.tr2.style.display = "none";
	post.placeholder.style.display = "";
}
function showPost(post)
{
	post.tr1.style.display = "";
	post.tr2.style.display = "";
	if (post.placeholder)
		post.placeholder.style.display = "none";
}

function ignoreUser(uid)
{
	// make sure we don't overwrite a change made on another page
	newIgnoreListStr = GM_getValue(location.hostname, "").split(':');
	newIgnoreList = new Array();
	for (i = 0; i < newIgnoreListStr.length; i++)
	{
		a = parseInt(newIgnoreListStr[i], 10);
		if (!isNaN(a))
			newIgnoreList.push(a);
	}
	i = newIgnoreList.indexOf(uid);
	if (i < 0)
	{
		newIgnoreList.push(uid);
		GM_setValue(location.hostname, newIgnoreList.join(':'));
	}
	ignoreList.push(uid);
	for (i in posts)
	{
		if (posts[i].uid == uid)
		{
			hidePost(posts[i]);
			posts[i].ignorelink.src = unignorebutton;
			posts[i].ignorelink.alt = posts[i].ignorelink.title = "Stop hiding posts from " + posts[i].username
		}
	}
}
function unignoreUser(uid)
{
	// make sure we don't overwrite a change made on another page
	newIgnoreListStr = GM_getValue(location.hostname, "").split(':');
	newIgnoreList = new Array();
	for (i = 0; i < newIgnoreListStr.length; i++)
	{
		a = parseInt(newIgnoreListStr[i], 10);
		if (!isNaN(a))
			newIgnoreList.push(a);
	}
	i = newIgnoreList.indexOf(uid);
	if (i >= 0)
	{
		newIgnoreList.splice(i, 1);
		GM_setValue(location.hostname, newIgnoreList.join(':'));
	}
	i = ignoreList.indexOf(uid);
	if (i >= 0)
		ignoreList.splice(i, 1);
	for (i in posts)
	{
		if (posts[i].uid == uid)
		{
			showPost(posts[i]);
			posts[i].ignorelink.src = ignorebutton;
			posts[i].ignorelink.alt = posts[i].ignorelink.title = "Hide posts from " + posts[i].username
		}
	}
}
function toggleIgnore(uid)
{
	i = ignoreList.indexOf(uid);
	if (i < 0)
		ignoreUser(uid);
	else
		unignoreUser(uid);
}