/**
	 * The tx_mmforum_Editor class is a helper class providing functionality
	 * for the post creation editor. It is meant to replace the old mm_forum.js
	 * file which included a lot of redundancies.
	 *
	 * @author    Martin Helmich <m.helmich@mittwald.de>
	 * @copyright Mittwald CM Service GmbH & Co. KG
	 * @version   0.1.8-090409
	 */
var tx_mmforum_Editor = Class.create();
tx_mmforum_Editor.prototype = {

		/* The ID of the editor form element */
	editorFieldId: "tx_mmforum_editor",

		/* Initializes the object. Actually does nothing. */
	initialize: function() {
		
	},

		/**
		 * Inserts a smily at the current cursor position of the
		 * message form field.
		 *
		 * @author  Martin Helmich <m.helmich@mittwald.de>
		 * @version 0.1.8-090409
		 * @param   smilie The smily to be inserted.
		 * @return  void
		 **/
	insertSmilie: function(smilie) {
		var editor = this.getEditorElement();

			/* Internet Explorer */
		if(typeof document.selection != 'undefined') {
			if (editor.createTextRange && editor.caretPos) {
				var caretPos = editor.caretPos;
				caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? smilie + ' ' : smilie;
			} else editor.value  += smilie;

			editor.focus();

			/* Gecko */
		} else if(typeof editor.selectionStart != 'undefined') {
			start	= editor.selectionStart;
			end		= editor.selectionEnd;

			editor.value = editor.value.substr(0, start) + smilie + editor.value.substr(end);

			editor.focus();
			editor.selectionStart = end + smilie.length;
			editor.selectionEnd = editor.selectionStart;

			/* Other */
		} else {
			editor.value += smilie;
			editor.focus();
		}
	},

		/**
		 * Applies a set of bbcode tags to the selected part of the message text.
		 *
		 * @author  Martin Helmich <m.helmich@mittwald.de>
		 * @version 0.1.8-090409
		 * @param   open  The opening bbcode tag
		 * @param   close The closing bbcode tag
		 * @return  void
		 */
	applyBBCode: function(open, close) {
		
		var editor = this.getEditorElement();
		
		//if url open tinymce
		if(open == '[url=]') {
			openLinkDialog(open,close,editor);
		}

		else {
			replaceBBContent(open, close, editor, '');
		}

	},

		/**
		 * Gets the editor form element.
		 *
		 * @author  Martin Helmich <m.helmich@mittwald.de>
		 * @version 0.1.8-090409
		 * @return  The editor form field
		 */
	getEditorElement: function() {
		return $(this.editorFieldId);
	}

}

function openLinkDialog(open,close,editor) {
	var ld = $$('#linkDialog');
	ld.dialog({
        title : 'Link eintragen',
        modal : true,
        buttons: {
            "Eintragen": function() {
                var linkURL = $$('#linkDialogLinkURL',ld).val();
				var linkText = $$('#linkDialogLinkText',ld).val();
				if(linkURL.indexOf('http://')==-1) {
					linkURL = 'http://'+linkURL;
				}
				replaceBBContent('[url='+linkURL+']', close, editor, linkText);
				$$(this).dialog("close");
            },
            "Abbrechen": function() {
                $$(this).dialog("close");
            }
        }
    });
}

function replaceBBContent(open, close, editor, preText){
    /* Internet Explorer */
    if (typeof document.selection != 'undefined') {
    
        var range = document.selection.createRange();
        var insText = range.text;
		
		if(preText != '') {
			insText = preText;
		}
        
        if (insText == '') {
            editor.value += open + close;
            editor.focus();
        }
        else {
            range.text = open + insText + close;
            /* Anpassen der Cursorposition */
            range = document.selection.createRange();
            
            range.moveStart('character', open.length + insText.length + close.length);
            range.select();
        }
    }
    
    /* Gecko */
    else 
        if (typeof editor.selectionStart != 'undefined') {
            start = editor.selectionStart;
            end = editor.selectionEnd;
            
            var insText = open + editor.value.substring(start, end) + close;
			if(preText != '') {
				insText = open + preText + close;
			}
            editor.value = editor.value.substr(0, start) + insText + editor.value.substr(end);
            
            editor.focus();
            editor.selectionStart = end + open.length;
            editor.selectionEnd = editor.selectionStart;
            
        /* Other */
        }
        else {
            editor.value += open + close;
            editor.focus();
        }
}