/**
 * 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, caption ){

	// 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;
	};
	
	this.first = true;
	this.name = '';
	this.inserted = new Array();
	
	/**
	 * Add a new file input element
	 */
	this.addElement = function( element ){
		if(this.first)
		{
			this.name = element.name;
			this.first = false;
		}
		// 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++;

			// 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';

				// Update list
				if(this.multi_selector.addListRow( this ))
				{
					// Add new element
					this.parentNode.insertBefore( new_element, this );
					
					// Apply 'update' to element
					this.multi_selector.addElement( new_element );
				};

				// 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' );
		};

	};

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

		// Row div
		var new_row = document.createElement( 'div' );
		new_row.className="item add_new";
		
		// Delete button
		var new_row_button = document.createElement( 'div' );
		new_row_button.type = 'button';
		new_row_button.value = 'Delete';
		new_row_button.className="doc-del";
		new_row.appendChild( new_row_button );

		// calc Icon type
		icon = element.value.split(".");
		
		switch(icon[icon.length -1]) { // handle variants
			case "pdf"  : // these are OK...
			case "doc"  : 
			case "jpg"  : 
			case "txt"  : break;
			case "docx" : icon[icon.length -1]="doc"; break;
			case "jpeg" : icon[icon.length -1]="jpg"; break;
			case "zip"  : icon[icon.length -1]="zip"; break;
			default		: icon[icon.length -1]="any"; break;
		}
	
		// Icon
		var new_row_icon = document.createElement( 'div' );
		new_row_icon.type = 'div';
		new_row_icon.className="icon " + icon[icon.length -1];		
		new_row.appendChild( new_row_icon );
				
		// Set row value
		var nametag = document.createElement( 'div' );
		nametag.className="nametag";
		
		var file_name = '';
		for(var j = 0; j < icon.length -1; j++) 
		{
			file_name += icon[j];
		}
		
		if (/msie/i.test(navigator.userAgent) && !/opera/i.test(navigator.userAgent)) 
		{
		// Set row value
			var path = file_name.split("\\");
			file_name = path[path.length - 1];
		} 
		if (find_in_array(file_name, this.inserted) !== -1) 
		{
			return false;
		}; 
		this.inserted.push(file_name);		
		nametag.innerHTML = file_name;
		
		new_row.appendChild( nametag );

		// References
		new_row.element = element;

		// Delete function
		new_row_button.onclick= function(){

			// Remove element from form
			this.parentNode.element.parentNode.removeChild( this.parentNode.element );

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

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

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

			// Appease Safari
			//    without it Safari wants to reload the browser window
			//    which nixes your already queued uploads
			return false;
		};

		
		// Add it to the list
		this.list_target.appendChild( new_row );
		
		if (caption) {
			$(".filelist-wrap").find(".add_new").last().append('<div class="label">Display as: </div><input class="file-btn" type="text" name="'+ this.name +'_caption_'+ (this.id-2) +'" value="'+file_name+'"/>');
		}
		return true;
	};
	
	

};

$(document).ready(
	function()
	{
		$('input.multifile:not(.form-filelist)').each(function()
		{
			var cdiv = $(this).parent('div.file-wrap, div.gallery_file-wrap');
			var multi_selector = new MultiSelector( document.getElementById(cdiv.attr('id')), 10, false );
			multi_selector.addElement( document.getElementById( $(this).attr('id') ));	
		});
		
		$('input.multifile.form-filelist, input.multifilelist').each(function()
		{
			var cdiv = $(this).parents('div.filelist-wrap');
			var multi_selector = new MultiSelector( document.getElementById( cdiv.attr('id') ), 10, true );
			multi_selector.addElement( document.getElementById( $(this).attr('id') ));	
			
		});
		
		
		
});