/**
 * 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(list_target, max, name, type, title, count)
{

	// 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;
	};

	if(type)
	{
        this.type = type;
    }
    else
    {
        this.type = 'image';
    }
    
    if(title)
	{
        this.title = title;
    }
    else
    {
        this.title = false;
    }
    
    if(count > 0)
	{
        this.count = count;
    }
	
	this.name = name;
	
	/**
	 * 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 = this.name + '_' + this.id++;
            element.name = this.name + '_' + this.count++;
			// 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';
              
				// 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' );
		};

	};
	
	this.refresh = function(element)
	{
		if(this.max != -1 && this.count >= this.max )
        {
			this.current_element.disabled = true;
		}
		else
		{
            this.current_element.disabled = false;
        }
    }

	/**
	 * Add a new row to the list of files
	 */
	this.addListRow = function(element){

		var file_name = element.value.split('\\').reverse()[0].split('/').reverse()[0];

		var new_row       = document.createElement('div');
		new_row.className = 'multifile';
		new_row.element   = element;

		var new_row_button   = document.createElement('input');
		new_row_button.type  = 'image';
		new_row_button.value = 'Delete';
		new_row_button.src   = '/public/icons/silk/cross.png';
		
		var new_row_title   = document.createElement('input');
		new_row_title.type  = 'text';
		new_row_title.value = file_name;
		new_row_title.name  = element.multi_selector.name + '_' + (element.multi_selector.count - 2) + '_title';


		new_row_button.onclick= function()
        {
            this.parentNode.element.parentNode.removeChild( this.parentNode.element );
			this.parentNode.parentNode.removeChild( this.parentNode );
			this.parentNode.element.multi_selector.count--;
			this.parentNode.element.multi_selector.current_element.disabled = false;
			return false;
		};

		new_row.appendChild(new_row_button);		
        
        if(this.title)
        {
            new_row.appendChild(new_row_title);
        }
        else
        {
	        new_row.appendChild(document.createTextNode(file_name));
        }
        
        this.list_target.appendChild( new_row );		
	};

};