(function($) {
	
	
	$.fn.bbcodeeditor = function(opt) 
	{
	    var textarea;
	    var options;
	    var disable_buttons = new Object();
	    var store_event;
	    var store_data = new Array('');
	    var undo_pos = 0;
	    var ie_cache = null; // fixes select start / end problem in IE
	    var ie_btn = null; // fixes select start / end problem in IE
	    var lb = '\n';
	    var pause = false;

	    options = $.extend({}, $.fn.bbcodeeditor.defaults, opt);
		textarea = this;
		
		if(!$.browser.opera) textarea.keydown(key_handler);
		else textarea.keypress(key_handler); // opera fix
		
		if($.browser.msie) {
			$(document).mousedown(function(e) {
				if(ie_btn != null && ie_btn == textarea[0]) ie_cache = document.selection.createRange();
				ie_btn = e.target;
			});
		}
		if($.browser.msie || $.browser.opera) lb = '\r\n';
			
		if(options.bold != false) options.bold.click(function() {print_bbc('bold text','[b]','[/b]')});
		if(options.italic != false) options.italic.click(function() {print_bbc('italic text','[i]','[/i]')});
		if(options.underline != false) options.underline.click(function() {print_bbc('underline text','[u]','[/u]')});
		if(options.link != false) options.link.click(add_link);
		if(options.quote != false) options.quote.click(function() {print_bbc('quote','[quote]','[/quote]',true)});
		if(options.code != false) options.code.click(function() {print_bbc('function(event) {','[code]','[/code]',true)});
		if(options.image != false) options.image.click(add_image);
		if(options.nlist != false) options.nlist.click(function() {print_bbc('list item','[list=1]' + lb + '[*]','[/list]',true)});
		if(options.blist != false) options.blist.click(function() {print_bbc('list item','[list]' + lb + '[*]','[/list]',true)});
		if(options.litem != false) options.litem.click(function() {print_bbc('list item','[*]','',true)});
		if(options.usize != false) options.usize.click(function() {font_size(true)});
		//if(options.dsize != false) options.dsize.click(function() {font_size(false)});
		
		if(options.back != false) 
		{
			if(options.back_disable != false) disable_buttons.back = options.back[0].className;
			options.back.click(go_back);
			enable_back(false);
		}
		if(options.forward != false)
		{
			if(options.forward_disable != false) disable_buttons.forward = options.forward[0].className;
			options.forward.click(go_forward);
			enable_forward(false); 
		}
		if(options.back != false || options.forward != false) textarea.keyup(backup_handler);
		
		$.fn.bbcodeeditor.preview(options);
		
		window.onbeforeunload = exit_page;


		function enable_back(bool) {
		    if (!bool) {
		        if (options.back_disable == false) {
		            options.back.css('opacity', 0.5);
		        }
		        else if (options.back != false) {
		            options.back[0].className = options.back_disable;
		        }
		    }
		    else {
		        if (options.back_disable == false) {
		            options.back.css('opacity', 1);
		        }
		        else if (options.back != false) {
		            options.back[0].className = disable_buttons.back;
		        }
		    }
		}

		function enable_forward(bool) {
		    if (!bool) {
		        if (options.forward_disable == false) {
		            options.forward.css('opacity', 0.5);
		        }
		        else if (options.forward != false) {
		            options.forward[0].className = options.forward_disable;
		        }
		    }
		    else {
		        if (options.forward_disable == false) {
		            options.forward.css('opacity', 1);
		        }
		        else if (options.forward != false) {
		            options.forward[0].className = disable_buttons.forward;
		        }
		    }
		}

		function exit_page(e) {
		    if (options.exit_warning && !pause && textarea[0].value != "") {
		        var e = e || window.event;
		        if (e) {
		            e.returnValue = 'You have started writing a post.';
		        }

		        return 'You have started writing a post.';
		    }
		}

		function backup_handler(e) {
		    if ($.browser.msie) ie_cache = document.selection.createRange();

		    if (e.keyCode != 17 && !(e.ctrlKey && (e.keyCode == 89 || e.keyCode == 90))) {
		        if (textarea.val().length != 0) enable_back(true);
		        else enable_back(false);

		        if (undo_pos != 0) {
		            store_data.slice(0, store_data.length - undo_pos);
		            enable_forward(false);
		            undo_pos = 0;
		        }
		        if (e.keyCode == 8 || e.keyCode == 13 || e.keyCode == 32 || e.keyCode == 46 || (e.ctrlKey && (e.keyCode == 67 || e.keyCode == 86))) backup();
		        $.fn.bbcodeeditor.preview(options);
		    }
		}

		function key_handler(e) {
		    if ($.browser.msie) ie_cache = document.selection.createRange();

		    if (options.keyboard && e.ctrlKey) {
		        if (e.keyCode == 66 && options.bold != false) // b
		        {
		            e.preventDefault();
		            print_bbc('bold text', '[b]', '[/b]');
		        }
		        else if (e.keyCode == 73 && options.italic != false) // i
		        {
		            e.preventDefault();
		            print_bbc('italic text', '[i]', '[/i]');
		        }
		        else if (e.keyCode == 75 && options.code != false) // k
		        {
		            e.preventDefault();
		            print_bbc('function(event) {', '[code]', '[/code]', true);
		        }
		        else if (e.keyCode == 76 && options.link != false) // l
		        {
		            e.preventDefault();
		            add_link();
		        }
		        else if (e.keyCode == 80 && options.image != false) // p
		        {
		            e.preventDefault();
		            add_image();
		        }
		        else if (e.keyCode == 81 && options.quote != false) // q
		        {
		            e.preventDefault();
		            print_bbc('quote', '[quote]', '[/quote]', true);
		        }
		        else if (e.keyCode == 85 && options.underline != false) // u
		        {
		            e.preventDefault();
		            print_bbc('underline text', '[u]', '[/u]');
		        }
		        else if (e.keyCode == 89 && options.forward != false) // y
		        {
		            e.preventDefault();
		            go_forward();
		        }
		        else if (e.keyCode == 90 && options.back != false) // z
		        {
		            e.preventDefault();
		            go_back();
		        }
		    }

		    if (e.keyCode == 13) {
		        var start = selection_range().start;
		        var line = textarea[0].value.substring(0, start).lastIndexOf('\n');
		        line = (line == -1 ? 0 : line + 1);

		        var matches = textarea[0].value.substring(line, start).match(/^\t+/g);
		        if (matches != null) {
		            e.preventDefault();
		            var scroll_fix = fix_scroll_pre();
		            var tabs = lb;
		            for (var i = 0; i < matches[0].length; i++) tabs += '\t';
		            textarea[0].value = textarea[0].value.substring(0, start) + tabs + textarea[0].value.substring(start);
		            set_focus(start + tabs.length, start + tabs.length);
		            fix_scroll(scroll_fix);
		        }
		    }
		    else if (e.keyCode == 9) {
		        e.preventDefault();

		        var scroll_fix = fix_scroll_pre();

		        backup();

		        var range = selection_range();

		        if (range.start != range.end && textarea[0].value.substr(range.start, 1) == '\n') range.start++;

		        var matches = textarea[0].value.substring(range.start, range.end).match(/\n/g); // check if multiline

		        if (matches != null) {
		            var index = textarea[0].value.substring(0, range.start).lastIndexOf(lb);
		            var start_tab = (index != -1 ? index : 0);

		            if (!e.shiftKey) {
		                var tab = textarea[0].value.substring(start_tab, range.end).replace(/\n/g, '\n\t');

		                textarea[0].value = (index == -1 ? '\t' : '') + textarea[0].value.substring(0, start_tab) + tab + textarea[0].value.substring(range.end);

		                set_focus(range.start + 1, range.end + matches.length + 1);
		            }
		            else {
		                var i = (textarea[0].value.substr((index != -1 ? index + lb.length : 0), 1) == '\t' ? 1 : 0);

		                var removed = textarea[0].value.substring(start_tab, range.end).match(/\n\t/g, '\n');

		                if (index == -1 && textarea[0].value.substr(0, 1) == '\t') {
		                    textarea[0].value = textarea[0].value.substr(1);
		                    removed.push(0); // null problem in IE 7
		                }

		                var tab = textarea[0].value.substring(start_tab, range.end).replace(/\n\t/g, '\n');

		                textarea[0].value = textarea[0].value.substring(0, start_tab) + tab + textarea[0].value.substring(range.end);

		                set_focus(range.start - i, range.end - (removed != null ? removed.length : 0));
		            }
		        }
		        else {
		            if (!e.shiftKey) {
		                textarea[0].value = textarea[0].value.substring(0, range.start) + '\t' + textarea[0].value.substring(range.start);
		                set_focus(range.start + 1, range.start + 1);
		            }
		            else {
		                var i_o = textarea[0].value.substring(0, range.start).lastIndexOf('\n'); // index open (start line) -1 = first line
		                var i_s = (i_o == -1 ? 0 : i_o); // index start line

		                var i_e = textarea[0].value.substring(i_s + 1).indexOf('\n'); // index end of line -1 = last line
		                if (i_e == -1) i_e = textarea[0].value.length;
		                else i_e += i_s + 1;

		                if (i_o == -1) {
		                    var match = textarea[0].value.substring(i_s, i_e).match(/^\t/);
		                    var tab = textarea[0].value.substring(i_s, i_e).replace(/^\t/, '');
		                }
		                else {
		                    var match = textarea[0].value.substring(i_s, i_e).match(/\n\t/);
		                    var tab = textarea[0].value.substring(i_s, i_e).replace(/\n\t/, '\n');
		                }

		                textarea[0].value = textarea[0].value.substring(0, i_s) + tab + textarea[0].value.substring(i_e);

		                if (match != null) set_focus(range.start - (range.start - 1 > i_o ? 1 : 0), range.end - ((range.start - 1 > i_o || range.start != range.end) ? 1 : 0));
		            }
		        }

		        fix_scroll(scroll_fix);
		    }
		}

		function fix_scroll_pre() {
		    return {
		        scrollTop: textarea.scrollTop(),
		        scrollHeight: textarea[0].scrollHeight
		    }
		}

		function fix_scroll(obj) {
		    textarea.scrollTop(obj.scrollTop + textarea[0].scrollHeight - obj.scrollHeight);
		}

		function backup() {
		    undo_pos = 0;
		    enable_forward(false);
		    enable_back(true);
		    if (store_data[store_data.length - 1] != textarea[0].value) store_data.push(textarea[0].value);
		}

		function go_back() {
		    var scrollTop = textarea.scrollTop();

		    if (undo_pos == 0) {
		        backup();
		        undo_pos++;
		    }

		    if (undo_pos != store_data.length) {
		        undo_pos++;

		        textarea[0].value = store_data[store_data.length - undo_pos];

		        $.fn.bbcodeeditor.preview(options);
		        enable_forward(true);

		        if (undo_pos == store_data.length) enable_back(false);
		    }
		    textarea.scrollTop(scrollTop);
		};

		function go_forward() {
		    var scrollTop = textarea.scrollTop();
		    if (undo_pos > 1) {
		        textarea[0].value = store_data[store_data.length - --undo_pos];

		        $.fn.bbcodeeditor.preview(options);
		        enable_back(true);
		        if (undo_pos == 1) enable_forward(false);
		    }
		    textarea.scrollTop(scrollTop);
		};

		function print_bbc(txt, open, close, clean_line) {
		    backup();

		    var range = selection_range();

		    var scroll_fix = fix_scroll_pre();

		    if (clean_line) {
		        if (close != '[/list]' && open != '[*]') open = open + lb;
		        if (open != '[*]') close = lb + close;
		        if (range.start != 0 && textarea[0].value.substr(range.start - 1, 1) != lb.substr(0, 1)) open = lb + open;
		        if (textarea[0].value.length != range.end && textarea[0].value.substr(range.end, 1) != lb.substr(0, 1)) close = close + lb;
		    }

		    if (range.start != range.end) {
		        txt = textarea[0].value;

		        if (clean_line) {
		            var re_b = new RegExp('\\[' + close.substring((lb.length == 2 ? 4 : 3), close.length - 1) + '(.*?)' + '\\]' + lb + (close == lb + '[/list]' ? '\\[\\*\\]' : '') + '$');
		            var re_a = new RegExp('^' + lb + '\\[\/' + close.substring((lb.length == 2 ? 4 : 3), close.length - 1) + '\\]');
		        }
		        else {
		            var re_b = new RegExp('\\[' + close.substring(2, close.length - 1) + '([^\\]]*?)\\]$', 'g'); // before
		            var re_a = new RegExp('^\\[\/' + close.substring(2, close.length - 1) + '\\]', 'g');  // after
		        }

		        var m_b = txt.substring(0, range.start).match(re_b); // length 1 or null
		        var m_a = txt.substring(range.end).match(re_a); // length 1 or null

		        if (m_b != null && m_a != null) {
		            textarea[0].value = txt.substring(0, range.start).replace(re_b, '') + txt.substring(range.start, range.end) + txt.substring(range.end).replace(re_a, '');

		            set_focus(range.start - m_b[0].length, range.end - m_b[0].length);
		        }
		        else {
		            textarea[0].value = textarea[0].value.substr(0, range.start) + open + textarea[0].value.substring(range.start, range.end) + close + textarea[0].value.substr(range.end);

		            set_focus(range.start + open.length, range.end + open.length);
		        }
		    }
		    else {
		        textarea[0].value = textarea[0].value.substring(0, range.start) + open + txt + close + textarea[0].value.substring(range.end);

		        set_focus(range.start + open.length, range.start + open.length + txt.length);
		    }

		    fix_scroll(scroll_fix);

		    $.fn.bbcodeeditor.preview(options);
		};

		function set_focus(start, end) {
		    if (!$.browser.msie) {
		        textarea[0].setSelectionRange(start, end);
		        textarea.focus();
		    }
		    else {
		        var m_s = textarea[0].value.substring(0, start).match(/\r/g);
		        m_s = (m_s != null ? m_s.length : 0);
		        var m_e = textarea[0].value.substring(start, end).match(/\r/g);
		        m_e = (m_e != null ? m_e.length : 0);

		        var range = textarea[0].createTextRange();
		        range.collapse(true);
		        range.moveStart('character', start - m_s);
		        range.moveEnd('character', end - start - m_e);
		        range.select();
		        ie_cache = document.selection.createRange();
		    }
		};

		function font_size(increase) {
		    if (increase) print_bbc('text', '[size=150]', '[/size]');
		    else print_bbc('text', '[size=80]', '[/size]');
		}

		function add_image() {
		    var link = 'http://';

		    print_bbc(link, '[img]', '[/img]');
		};

		function add_link(image) {
		    var link = "http://";

		    print_bbc('link text', '[url=' + link + ']', '[/url]');
		};

		function selection_range() {
		    if (!$.browser.msie) {
		        return { start: textarea[0].selectionStart, end: textarea[0].selectionEnd }
		    }
		    else {
		        if (ie_cache == null) return { start: textarea[0].value.length, end: textarea[0].value.length };

		        var selection_range = ie_cache.duplicate();

		        var before_range = document.body.createTextRange();
		        before_range.moveToElementText(textarea[0]);                    // Selects all the text
		        before_range.setEndPoint("EndToStart", selection_range);     // Moves the end where we need it

		        var after_range = document.body.createTextRange();
		        after_range.moveToElementText(textarea[0]);                     // Selects all the text
		        after_range.setEndPoint("StartToEnd", selection_range);      // Moves the start where we need it

		        var before_finished = false, selection_finished = false, after_finished = false;
		        var before_text, untrimmed_before_text, selection_text, untrimmed_selection_text, after_text, untrimmed_after_text;

		        before_text = untrimmed_before_text = before_range.text;
		        selection_text = untrimmed_selection_text = selection_range.text;
		        after_text = untrimmed_after_text = after_range.text;

		        do {
		            if (!before_finished) {
		                if (before_range.compareEndPoints("StartToEnd", before_range) == 0) {
		                    before_finished = true;
		                } else {
		                    before_range.moveEnd("character", -1)
		                    if (before_range.text == before_text) {
		                        untrimmed_before_text += "\r\n";
		                    } else {
		                        before_finished = true;
		                    }
		                }
		            }
		            if (!selection_finished) {
		                if (selection_range.compareEndPoints("StartToEnd", selection_range) == 0) {
		                    selection_finished = true;
		                } else {
		                    selection_range.moveEnd("character", -1)
		                    if (selection_range.text == selection_text) {
		                        untrimmed_selection_text += "\r\n";
		                    } else {
		                        selection_finished = true;
		                    }
		                }
		            }
		            if (!after_finished) {
		                if (after_range.compareEndPoints("StartToEnd", after_range) == 0) {
		                    after_finished = true;
		                } else {
		                    after_range.moveEnd("character", -1)
		                    if (after_range.text == after_text) {
		                        untrimmed_after_text += "\r\n";
		                    } else {
		                        after_finished = true;
		                    }
		                }
		            }

		        } while ((!before_finished || !selection_finished || !after_finished));

		        return { start: untrimmed_before_text.length, end: untrimmed_before_text.length + untrimmed_selection_text.length };
		    }
		}

		return this;
	};
	
	
		
	$.fn.bbcodeeditor.defaults = {
		bold:false,
		italic:false,
		underline:false,
		link:false,
		quote:false,
		code:false,
		image:false,
		usize:false,
		nsize:false,
		nlist:false,
		blist:false,
		litem:false,
		back:false,
		back_disable:false,
		forward:false,
		forward_disable:false,
		exit_warning:false,
		preview:false,
		keyboard:true
	};	
	
	$.fn.bbcodeeditor.preview = function(options) {
		if(options.preview != false) 
		{
			var txt = textarea.val();
			txt = txt.replace(/</g,'&lt;');
			txt = txt.replace(/>/g,'&gt;');
			
			txt = txt.replace(/[\r\n]/g,'%lb%');
			
			var find	= [/\[b\](.*?)\[\/b\]/gi,
			        	   /\[i\](.*?)\[\/i\]/gi,
			        	   /\[u\](.*?)\[\/u\]/gi,
			        	   /\[size=(8\d|9\d|1\d\d|200)](.*?)\[\/size\]/gi,
			        	   /\[url(?:\=?)(.*?)\](.*?)\[\/url\]/gi,
			        	   /\[img(.*?)\](.*?)\[\/img\]/gi,
			        	   /(?:%lb%|\s)*\[code(?:\=?)(?:.*?)\](?:%lb%|\s)*(.*?)(?:%lb%|\s)*\[\/code\](?:%lb%|\s)*/gi,
			        	   /(?:%lb%|\s)*\[quote(?:\=?)(.*?)\](?:%lb%|\s)*(.*?)(?:%lb%|\s)*\[\/quote\](?:%lb%|\s)*/gi,
			        	   /\[list(.*?)\](.*?)\[\*\](.*?)(?:%lb%|\s)*(\[\*\].*?\[\/list\]|\[\/list\])/i,
			        	   /(?:%lb%|\s)*\[list\](?:%lb%|\s)*(.*?)(?:%lb%|\s)*\[\/list\](?:%lb%|\s)*/gi,
			        	   /(?:%lb%|\s)*\[list=(\d)\](?:%lb%|\s)*(.*?)(?:%lb%|\s)*\[\/list\](?:%lb%|\s)*/gi,
			        	   /(?:%lb%){3,}/g
			        	   ];
			var replace	= ['<b>$1<\/b>',
			           	   '<i>$1<\/i>',
			           	   '<u>$1<\/u>',
			           	   '<span style="font-size:$1%;">$2</span>',
			           	   '<a href="$1">$2</a>',
			           	   '<img $1 src="$2" />',
			           	   '<pre><code>$1</code></pre>',
			           	   '<blockquote>$2</blockquote>',
			           	   '[list$1]$2<li>$3</li>$4',
			           	   '<ul>$1</ul>',
			           	   '<ol start=$1>$2</ol>',
			           	   '%lb%%lb%'
			           	   ];

			for(var i in find)
			{
				txt = txt.replace(find[i],replace[i]);
				if(i == 8) while(txt.match(find[i],replace[i])) txt = txt.replace(find[i],replace[i]); // fix [*] so that they only work inside [/list]
			}
			
			txt = txt.replace(/%lb%/g,'<br />');

			options.preview.html(txt);
		}
	};
	
	$.fn.bbcodeeditor.pause = function() {
		if(!pause) pause = true;
		else pause = false;
	};


})(jQuery);