/**

 * 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 ){

	// 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 = 'file[]'; //_' + this.id++;

			element.className = "text";

			element.size = "35";

			// Add reference to this object

			element.multi_selector = this;

			// What to do when a file is selected

			element.onchange = function(){

				/* Set the Types Allowed */

				var types_allowed = ".gif, .jpg, .png";

				/* Get the form valu and strign length*/

				var form_value = element.value;

				var str_end = form_value.length;

				/* Find out the filetype of the selected file */

				var str_start = ((str_end/1) - 4);

				var file_type = form_value.substring(str_start, str_end).toLowerCase();;

				/* Replace Spaces for correct splitting */

				var arrFiles = types_allowed.replace(/ /g, "");

				arrFiles = arrFiles.split(",");

				var file_correct = 0;

				var i_max = arrFiles.length;

				for(var i = 0; i < i_max; i++)

					{

						if(file_type == arrFiles[i])

							{var file_correct = 1; break;}

					}

				if(file_correct == 0)

					{alert("Only the following files are allowed in this file input: "+types_allowed);}

				else

					{

						// 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;

				alert("You have reached the maximum of "+ this.max +" uploads at a time.");

			};

			// 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 ){

		var file_List = document.getElementById("files_list").innerHTML;

		if(file_List == "You have not selected any images")

			{document.getElementById("files_list").innerHTML = "";}

		// Row div

		var new_row = document.createElement('div');

		new_row.style.padding = "6px;"; 

		new_row.className = "add_image";

		var new_row_button = document.createElement( 'a' );

		new_row_button.href = "javascript:;";

		new_row_button.innerHTML += " Remove"

		new_row_button.style.top = "-11px"

		// 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;

		};

		// Set row value 

		// Loop through the full file path and remove all the text up to the actual file name.

		element_HTML = element.value.toString();

		var i_len = element_HTML.length;

		for(var i = 0; i < i_len; i++)

			{

				var element_HTML_findslash = element_HTML.toString().indexOf('\\');

				if(element_HTML_findslash == -1)

					{break}

				else

					{element_HTML = element_HTML.substring((element_HTML_findslash+1), i_len);}

			}

		new_row.innerHTML = element_HTML+" "; //element.value;

		// Add button

		new_row.appendChild( new_row_button );

		// Add it to the list

		this.list_target.appendChild( new_row );

	};

};