// ==UserScript==
// @name           Epinions Review Filter
// @namespace      http://diveintogreasemonkey.org/download
// @description    Filters out "bad" reviews in epinions
// @include        http://www.epinions.com/*/display_~reviews
// ==/UserScript==


var charcountmin = 300; // minimum number of char to be considered a valid review
var ignore_list = " bobcat7677 bob joe ladybrent "; // make sure there is a space between each user name and at the beginning and the ending of the string

var bad_word_array = new Array("lame", "sucks", "thru");

var ask_confirmation = 1; // set to 0 so that no confirmation is asked 1 for confirmation
var keep_pros_cons = 1;
var keep_pros_cons_from_ignore_list = 0;



var reviews;
var rev;
var block, titleblock, infoblock;
var userblock;
var user, title;
var text, procon;

reviews = document.evaluate("//table//tr[@bgcolor='white']", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);

for (var x = 0; x < reviews.snapshotLength; x++){

	rev = reviews.snapshotItem(x);
	block = rev.childNodes[3];
	titleblock = block.childNodes[1];
	title = titleblock.childNodes[0];
	userblock = titleblock.childNodes[2];
	user = userblock.childNodes[1].textContent;
	
	infoblock = block.childNodes[3];
	procon = infoblock.childNodes[0].textContent;
	text = infoblock.childNodes[2].textContent;
	
	var user_page = "http://www.epinions.com/user-" + user;

	var textbool = checkText(text);
	var userbool = checkBadUser(user);
	var badtextbool = checkBadWord(text);
	if (textbool ==0 || userbool ==0 || badtextbool==0){
		var err_str = "Do you want to delete  the review by: " + user;
		err_str+= "\n\n\nThis review is up for consideration because: ";
		if (textbool ==0)
		   err_str += "\n-The review was too short and is unlikely to" +
			      "\n  provide constructive comments.";

		if(badtextbool ==0)
		   err_str+= "\n-The review contains a word that indicates"+
			     "\n  that it is poorly written and may be" +
       	    	             "\n  unconstructive.";

		if (userbool ==0)
		   err_str += "\n-"+user+" is on your ignore list.";

		if (ask_confirmation ==1){
			if (confirm(err_str)){
				if (keep_pros_cons==1)
					if (userbool == 0 && keep_pros_cons_from_ignore_list == 0){
						rev.parentNode.removeChild(rev);		
					}else // keep pro con
						infoblock.removeChild(infoblock.childNodes[2])
				else
					rev.parentNode.removeChild(rev);		
			}
		}else{
				if (keep_pros_cons==1)
					if (userbool == 0 && keep_pros_cons_from_ignore_list == 0){
						rev.parentNode.removeChild(rev);		
					}else // keep pro con
						infoblock.removeChild(infoblock.childNodes[2])
				else
					rev.parentNode.removeChild(rev);				}
		
	}


}


function checkText(text){
	var length = text.length;
	if (text.charAt(length - 2) == '.' && //checks if a review is long enough to continue onto another page
		text.charAt(length-3) == '.' && // i know this can be tricked but shouldn't be much of an issue
		text.charAt(length-4) == '.'){
		return 1;
	}else if (length > charcountmin) //makes sure that the message is a minimum length to root out unproductive comments
		return 1;

	return 0;

}

function checkBadUser(name){
	var ind = ignore_list.search(' ' + name + ' ');
	if (ind !=-1)
		return 0;
	
	return 1;
}

function checkBadWord(text){
	var i;
	for (i in bad_word_array){
		var ind = text.search(bad_word_array[i]);
		if (ind !=-1)
			return 0;
	}

	return 1;


}