/**
 * Convert a single file-input element into a 'multiple' input list
 *
 * Usage:
 *
 *   1. Create a file input element (no name)
 *      eg. <input type="file" id="first_file_element">
 *
 *   2. Create a DIV for the output to be written to
 *      eg. <div id="files_list"></div>
 *
 *   3. Instantiate a MultiSelector object, passing in the DIV and an (optional) maximum number of files
 *      eg. var multi_selector = new MultiSelector( document.getElementById( 'files_list' ), 3 );
 *
 *   4. Add the first element
 *      eg. multi_selector.addElement( document.getElementById( 'first_file_element' ) );
 *
 *   5. That's it.
 *
 *   You might (will) want to play around with the addListRow() method to make the output prettier.
 *
 *   You might also want to change the line 
 *       element.name = 'file_' + this.count;
 *   ...to a naming convention that makes more sense to you.
 * 
 * Licence:
 *   Use this however/wherever you like, just don't blame me if it breaks anything.
 *
 * Credit:
 *   If you're nice, you'll leave this bit:
 *  
 *   Class by Stickman -- http://www.the-stickman.com
 *      with thanks to:
 *      [for Safari fixes]
 *         Luis Torrefranca -- http://www.law.pitt.edu
 *         and
 *         Shawn Parker & John Pennypacker -- http://www.fuzzycoconut.com
 *      [for duplicate name bug]
 *         'neal'
 */
function MultiSelector(name_prefix, list_target, max ){

    this.name_prefix = name_prefix;
	// Where to write the list
	this.list_target = list_target;
	// How many elements?
	this.count = 0;
	// How many elements?
	this.id = 0;
	// Is there a maximum?
	if( max ){
		this.max = max;
	} else {
		this.max = -1;
	};
	
	/**
	 * Add a new file input element
	 */
	this.addElement = function( element ){

		// Make sure it's a file input element
		if( element.tagName == 'INPUT' && element.type == 'file' ){

			// Element name -- what number am I?
			element.name = name_prefix + '_file_' + this.id++;

			// Add reference to this object
			element.multi_selector = this;

			// What to do when a file is selected
			element.onchange = function(){

				// New file input
				var new_element = document.createElement( 'input' );
				new_element.type = 'file';
				new_element.className = this.className;

				// Add new element
				this.parentNode.insertBefore( new_element, this );

				// Apply 'update' to element
				this.multi_selector.addElement( new_element );

				// Update list
				this.multi_selector.addListRow( this );

				// Hide this: we can't use display:none because Safari doesn't like it
				this.style.position = 'absolute';
				this.style.left = '-1000px';

			};
			// If we've reached maximum number, disable input element
			if( this.max != -1 && this.count >= this.max ){
				element.disabled = true;
			};

			// File element counter
			this.count++;
			// Most recent element
			this.current_element = element;
			
		} else {
			// This can only be applied to file input elements!
			alert( 'Error: not a file input element' );
		};

	};


/*
            <tr>
                <td style="border-bottom:1px solid #336699"><span class="txtCopySmall">Filename:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;jhdfun3409832j.gif &nbsp;&nbsp;<i>(new)</i></span><br />
                    <span class="txtCopySmall">Description: </span><input type="text" style="width:350px" value="" /></td>
                <td style="width:20px;border-bottom:1px solid #336699"><a href="" onclick="??"><img border="0" src="/images/dropRecord.gif" alt="Delete"/></a></td>
            </tr>
*/
	/**
	 * Add a new row to the list of files
	 */
	this.addListRow = function( element ){
        // get our filename	
  		var filename = element.value;
		var xpos = filename.lastIndexOf('\\');
		if (xpos > -1) 
		{
		    filename = filename.substr(xpos+1);
		}
	
	    // create new table row
        var new_row = document.createElement('tr');
        new_row.element = element;
        
        var new_td1 = document.createElement('td');
        new_td1.style.borderBottom = '1px solid #cccccc';
        
        var new_span1 = document.createElement('span');
        new_span1.className = 'txtCopySmall';
        new_span1.innerHTML = 'Filename:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;' + filename + '&nbsp;&nbsp;';
        
        var new_i = document.createElement('i');
        //AppendElementText(new_i,'(new)');
        new_span1.appendChild(new_i);
        new_td1.appendChild(new_span1);

        new_td1.appendChild(document.createElement('br'));

        var new_span2 = document.createElement('span');
        new_span2.className = 'txtCopySmall';
        AppendElementText(new_span2, 'Description: ');
        new_td1.appendChild(new_span2);
               
        var new_desc = document.createElement('input');
        new_desc.name = this.name_prefix + '_desc_' + (this.id-2);
        new_desc.style.width = '350px';
        new_desc.maxLength = '50';
        new_td1.appendChild(new_desc);
        new_row.appendChild(new_td1);
        
        
        
        
        
        
        var new_td3 = document.createElement('td');
        new_td3.style.width = '20px';
        new_td3.style.borderBottom = '1px solid #cccccc';
        
        var new_a = document.createElement('a');
        new_a.href = ' ';
        new_a.onclick=function(){
			// Remove element from form
			this.parentNode.parentNode.element.parentNode.removeChild( this.parentNode.parentNode.element );

			// Remove this row from the list
			this.parentNode.parentNode.parentNode.removeChild(this.parentNode.parentNode);

			// Decrement counter
			this.parentNode.parentNode.element.multi_selector.count--;

			// Re-enable input element (if it's disabled)
			this.parentNode.parentNode.element.multi_selector.current_element.disabled = false;

			return false;
        }
        
        var new_del = document.createElement('img');
        new_del.src = '/images/dropRecord.gif';
        new_del.alt = 'Delete';
        new_del.border = '0';
        
        new_a.appendChild(new_del);
        new_td3.appendChild(new_a);
        new_row.appendChild(new_td3);
        
        this.list_target.appendChild(new_row);
        return;
	};
};

function AppendElementText(Element, InsertThisText)
{
    if(Element.firstChild)
    {
        Element.firstChild.nodeValue=InsertThisText;
    }
    else
    {
        Element.appendChild(document.createTextNode(InsertThisText));
    }
}