/**
 * 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_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;
	}
	
	// File input field name's prefix
	this.prefix = name_prefix;
	$('photo-text').value = '';
	/**
	 * 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?
			this.id++;
			element.name = this.prefix + this.id;
			element.id = this.prefix + this.id;
			element.className = "photo-file";
			element.size = '40';
			
			// Add reference to this object
			element.multi_selector = this;

			// What to do when a file is selected
			Event.observe(element, 'change', function() {
				$('photo-text').value = '';
				//showFile(element.id, 'photo-text');
				// New file input
				var new_element = document.createElement( 'input' );
				new_element.type = 'file';

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

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

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

				// Hide this: we can't use display:none because Safari doesn't like it
				element.style.position = 'absolute';
				element.style.left = '-1000px';
			});
			
			element.onkeyup = function(){
				showFile(element.id, 'photo-text');
			};
	
			// If we've reached maximum number, disable input element
			if( this.max != -1 && this.count >= this.max ){
				element.disabled = true;
				//$('browse-button').hide();
				$('browse-button').style.visibility = 'hidden';
			};

			// 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.style.marginTop = new_row.style.marginBottom = "0px";
		
		// Delete button
		var new_row_button = document.createElement( 'input' );
		new_row_button.type = 'button';
		new_row_button.value = '';
		new_row_button.className = 'btn_rm';

		// 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;
			//$('browse-button').show();
			$('browse-button').style.visibility = 'visible';

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

		// Set row value
		new_row.innerHTML = getFileNameOnly(element.value) + '&nbsp; ';

		// Add button
		new_row.appendChild( new_row_button );

		// Add it to the list
		this.list_target.appendChild( new_row );
		
	};
	
	this.removeAll = function() {
		var els = document.getElementsByClassName('btn_rm');
		els.each(function(e){
			if (e.type == 'button' && e.value == '')
				e.onclick();
		});
	}

};

/*
The code below is used to format the file uploader browse button
*/

var W3CDOM = (document.createElement && document.getElementsByTagName);

function initFileUploads(real_input) {
	if (!W3CDOM) return;
	var fakeFileUpload = document.createElement('div');
	fakeFileUpload.className = 'fakefile';
	fakeFileUpload.appendChild(document.createElement('input'));
	var image = document.createElement('img');
	image.id = "browse_button"
	image.src = webroot+'img/btn_browse.gif';
	image.className = "browse_button";
	fakeFileUpload.appendChild(image);
	if (real_input.type != 'file') return;
	if (real_input.parentNode.className != 'fileinputs') return;
	//real_input.className = 'file_input';
	real_input.parentNode.appendChild(fakeFileUpload);
	real_input.relatedElement = fakeFileUpload;
	Event.observe(real_input, 'change', function() {
		real_input.relatedElement.value = real_input.value;
	});
}

function getFileNameOnly(fullPath)
{
	var temp = new Array();
	temp = fullPath.split('\\');
	return temp[(temp.length-1)];
}

function showFile(file, text) {
	$(text).value = $(file).value;
}