/*******************************************************************************
* modulos/forms/plugins/ficheiros.js
*
* Copyright (C) 2006 Miguel F. Morais, based on Stickman's work (see below)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
********************************************************************************/
/**
 * 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, simples) {

	// 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;
	}

	// Modo simples?
	this.simples = simples;

	/**
	 * Add a new file input element
	 */
	this.addElement = function (element, nome) {

		// 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.name = nome + '[]';

			// 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);
				//this.parentNode.appendChild (new_element);

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

				// Update list
				this.multi_selector.addListRow (this, nome);

				// 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, nome) {

		// 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 = 'Remover';

		// Campo 'hidden'
		var campo_hidden = document.createElement ('input');
		campo_hidden.name = nome + '_ficheiro[]';
		campo_hidden.type = 'hidden';
		campo_hidden.value = element.value;

		// Modo não simples: adicionar campos Nome e Descrição, cada um na sua div
		if (!this.simples) {
			var div_nome = document.createElement ('div');
			div_nome.innerHTML = 'Nome: ';
			var campo_nome = document.createElement ('input');
			campo_nome.name = nome + '_nome[]';
			campo_nome.type = 'text';
			div_nome.appendChild (campo_nome);

			var div_descricao = document.createElement ('div');
			div_descricao.innerHTML = 'Descrição: ';
			var campo_descricao = document.createElement ('textarea');
			campo_descricao.name = nome + '_descricao[]';
			div_descricao.appendChild (campo_descricao);
		}

		// References
		new_row.element = element;

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

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

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

			// Esconde lista se não há elementos
			if (this.parentNode.element.multi_selector.count < 2) this.parentNode.parentNode.style.display = "none";

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

			// 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
		new_row.innerHTML = element.value;

		// Add button
		new_row.appendChild (new_row_button);

		// Adiciona campo hidden
		new_row.appendChild (campo_hidden);

		// Adiciona campos de não-simples
		if (!this.simples) {
			new_row.appendChild (div_nome);
			new_row.appendChild (div_descricao);
		}

		// Add it to the list
		this.list_target.appendChild (new_row);

		// Mostrar lista se há elementos (há sempre no mínimo 1 elemento)
		if (element.multi_selector.count == 2) this.list_target.style.display = "inline";

	}

}