<?php
/**
 * Defines a set of tabs in a form.
 * The tabs are build with our standard tabstrip javascript library.
 * By default, the HTML is generated using FieldHolder.
 *
 * <b>Usage</b>
 *
 * <code>
 * new TabSet(
 * 	$name = "TheTabSetName",
 * 	new Tab(
 * 		$title='Tab one',
 * 		new HeaderField("A header"),
 * 		new LiteralField("Lipsum","Lorem ipsum dolor sit amet enim.")
 * 	),
 * 	new Tab(
 * 		$title='Tab two',
 * 		new HeaderField("A second header"),
 * 		new LiteralField("Lipsum","Ipsum dolor sit amet enim.")
 * 	)
 * )
 * </code>
 *
 * @package forms
 * @subpackage fields-structural
 */
class TabSet extends CompositeField {

	/**
	 * @param string $name Identifier
	 * @param string $title (Optional) Natural language title of the tabset
	 * @param Tab|TabSet $unknown All further parameters are inserted as children into the TabSet
	 */
	public function __construct($name) {
		$args = func_get_args();

		$name = array_shift($args);
		if(!is_string($name)) user_error('TabSet::__construct(): $name parameter to a valid string', E_USER_ERROR);
		$this->name = $name;

		$this->id = $name;

		// Legacy handling: only assume second parameter as title if its a string,
		// otherwise it might be a formfield instance
		if(isset($args[0]) && is_string($args[0])) {
			$title = array_shift($args);
		}
		$this->title = (isset($title)) ? $title : FormField::name_to_label($name);

		if($args) foreach($args as $tab) {
			$isValidArg = (is_object($tab) && (!($tab instanceof Tab) || !($tab instanceof TabSet)));
			if(!$isValidArg) user_error('TabSet::__construct(): Parameter not a valid Tab instance', E_USER_ERROR);

			$tab->setTabSet($this);
		}

		parent::__construct($args);
	}

	public function id() {
		if($this->tabSet) return $this->tabSet->id() . '_' . $this->id . '_set';
		else return $this->id;
	}

	/**
	 * Returns a tab-strip and the associated tabs.
	 * The HTML is a standardised format, containing a &lt;ul;
	 */
	public function FieldHolder($properties = array()) {
		Requirements::javascript(FRAMEWORK_DIR . '/thirdparty/jquery/jquery.js');
		Requirements::javascript(FRAMEWORK_DIR . '/thirdparty/jquery-ui/jquery-ui.js');
		Requirements::javascript(FRAMEWORK_DIR . '/thirdparty/jquery-cookie/jquery.cookie.js');

		Requirements::css(FRAMEWORK_DIR . '/thirdparty/jquery-ui-themes/smoothness/jquery-ui.css');

		Requirements::javascript(FRAMEWORK_DIR . '/thirdparty/jquery-entwine/dist/jquery.entwine-dist.js');

		Requirements::javascript(FRAMEWORK_DIR . '/javascript/dist/TabSet.js');

		$obj = $properties ? $this->customise($properties) : $this;

		return $obj->renderWith($this->getTemplates());
	}

	/**
	 * Return a dataobject set of all this classes tabs
	 */
	public function Tabs() {
		return $this->children;
	}

	public function setTabs($children){
		$this->children = $children;
	}

	public function setTabSet($val) {
		$this->tabSet = $val;
		return $this;
	}

	public function getTabSet() {
		if(isset($this->tabSet)) return $this->tabSet;
	}

	public function getAttributes() {
		return array_merge(
			$this->attributes,
			array(
				'id' => $this->id(),
				'class' => $this->extraClass()
			)
		);
	}

	/**
	 * Returns a named field.
	 *
	 * @param string $name Name of the field you want to find. Allows for dot notation.
	 * @return FormField|null
	 */
	public function fieldByName($name) {
		if(strpos($name,'.') !== false)	list($name, $remainder) = explode('.',$name,2);
		else $remainder = null;

		foreach($this->children as $child) {
			if(trim($name) == trim($child->Name) || $name == $child->id) {
				if($remainder) {
					if($child->isComposite()) {
						return $child->fieldByName($remainder);
					} else {
						user_error("Trying to get field '$remainder' from non-composite field $child->class.$name",
							E_USER_WARNING);
						return null;
					}
				} else {
					return $child;
				}
			}
		}

		return null;
	}

	/**
	 * Add a new child field to the end of the set.
	 */
	public function push(FormField $field) {
		parent::push($field);
		$field->setTabSet($this);
	}

	/**
	 * Add a new child field to the beginning of the set.
	 */
	public function unshift(FormField $field) {
		parent::unshift($field);
		$field->setTabSet($this);
	}

	/**
	 * Inserts a field before a particular field in a FieldList.
	 *
	 * @param string $insertBefore Name of the field to insert before
	 * @param FormField $field The form field to insert
	 * @return	FormField|null
	 */
	public function insertBefore($insertBefore, $field) {
		if($field instanceof Tab) $field->setTabSet($this);
		return parent::insertBefore($insertBefore, $field);
	}

	/**
	 * Inserts a field after a particular field in a FieldList.
	 *
	 * @param string $insertAfter Name of the field to insert after
	 * @param FormField $field The form field to insert
	 * @return FormField|null
	 */
	public function insertAfter($insertAfter, $field) {
		if($field instanceof Tab) $field->setTabSet($this);
		return parent::insertAfter($insertAfter, $field);
	}
}