/**
 * 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' ) );
 */

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;
	};
	this.totalSize = 0;
	
	/**
	 * 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++;

			// 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';
				this.style.top = '-1000px';
				this.style.display = 'none';
				this.style.visibility = 'hidden';
				this.style.width = '0';
				this.style.height = '0';
				this.style.overflow = 'hidden';

				new_element.onkeypress = function(){
					return false;
				};

			};
			// 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' );

		// Delete button
		var new_row_button = document.createElement( 'input' );
		new_row_button.type = 'button';
		new_row_button.value = '삭제';

		// 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--;
			this.totalSize = this.totalSize-this.parentNode.element.files[0].size;

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

			//    which nixes your already queued uploads
			return false;
		};

		// Set row value
		//new_row.innerHTML = element.value;
		
		
		this.totalSize = this.totalSize +element.files[0].size;
		//alert( this.totalSize );
		/*
		if( element.files[0].size > (1024*1024*100) ){
			this.count--;
			this.totalSize = this.totalSize-element.files[0].size;
			alert("업로드할 수 있는 최대크기를 초과하였습니다.(최대 100 MB)\n선택한 파일 사이즈는 " + (setUnitString(element.files[0].size)) + "입니다.");
			if( this.max != -1 && this.count > this.max ){
				//alert("aaaa");
			} else {
				//alert("bbb");
				this.current_element.disabled = false;
			};
			
			return false;
		}
		*/
		//$("#totalAttFileSize").html("total size="+(setUnitString(this.totalSize)));

		new_row.innerHTML = element.value + " (" + setUnitString(element.files[0].size) + ") " + "&nbsp;&nbsp;";

		// Add button
		new_row.appendChild( new_row_button );

		// Add it to the list
		this.list_target.appendChild( new_row );
	};
	
	
	/**
	 * byte로 받은 이미지 용량을 화면에 표시를 위해 포맷팅
	 * @param {Object} nByte
	 */
	function setUnitString (nByte) {
		var nImageSize;
		var sUnit;
		
		if(nByte < 0 ){
			nByte = 0;
		}
		
		if( nByte < 1024) {
			nImageSize = Number(nByte);
			sUnit = ' B';
			return nImageSize + sUnit;
		} else if( nByte > (1024*1024)) {
			nImageSize = Number(parseInt((nByte || 0), 10) / (1024*1024));
			sUnit = ' MB';
			return nImageSize.toFixed(2) + sUnit;
		} else {
			nImageSize = Number(parseInt((nByte || 0), 10) / 1024);
			sUnit = ' KB';
			return nImageSize.toFixed(0) + sUnit;
		}
	}


};