<?php
/**
 * Description of GridFieldConfig
 *
 */
class GridFieldConfig {
	
	/**
	 *
	 * @return GridFieldConfig 
	 */
	public static function create(){
		return new GridFieldConfig();
	}
	
	/**
	 *
	 * @var ArrayList
	 */
	protected $components = null;
	
	/**
	 * 
	 */
	public function __construct() {
		$this->components = new ArrayList();
	}
	
	/**
	 * @param GridFieldComponent $component 
	 */
	public function addComponent(GridFieldComponent $component) {
		$this->getComponents()->push($component);
		return $this;
	}

	/**
	 * @param GridFieldComponent One or more components
	 */
	public function addComponents() {
		$components = func_get_args();
		foreach($components as $component) $this->addComponent($component);
		return $this;
	}
	
	/**
	 * @return ArrayList Of GridFieldComponent
	 */
	public function getComponents() {
		if(!$this->components) {
			$this->components = new ArrayList();
		}
		return $this->components;
	}

	/**
	 * Returns all components extending a certain class, or implementing a certain interface.
	 * 
	 * @param String Class name or interface
	 * @return ArrayList Of GridFieldComponent
	 */
	public function getComponentsByType($type) {
		$components = new ArrayList();
		foreach($this->components as $component) {
			if($component instanceof $type) $components->push($component);
		}
		return $components;
	}

	/**
	 * Returns the first available component with the given class or interface.
	 * 
	 * @param String ClassName
	 * @return GridFieldComponent
	 */
	public function getComponentByType($type) {
		foreach($this->components as $component) {
			if($component instanceof $type) return $component;
		}
	}
}

class GridFieldConfig_Base extends GridFieldConfig {

	/**
	 *
	 * @param int $itemsPerPage - How many items per page should show up per page
	 * @return GridFieldConfig_Base
	 */
	public static function create($itemsPerPage=15){
		return new GridFieldConfig_Base($itemsPerPage);
	}

	/**
	 *
	 * @param int $itemsPerPage - How many items per page should show up
	 */
	public function __construct($itemsPerPage=15) {
		$this->addComponent(new GridFieldTitle());
		$this->addComponent(new GridFieldSortableHeader());
		$this->addComponent(new GridFieldFilter());
		$this->addComponent(new GridFieldDefaultColumns());
		$this->addComponent(new GridFieldPaginator($itemsPerPage));
	}
}

/**
 * This GridFieldConfig bundles a common set of componentes  used for displaying
 * a gridfield with:
 * 
 * - Relation adding
 * - Sortable header
 * - Default columns
 * - Edit links on every item
 * - Action for removing relationship
 * - Paginator
 * 
 */
class GridFieldConfig_ManyManyEditor extends GridFieldConfig {

	/**
	 *
	 * @param string $fieldToSearch - Which field on the object should be searched for
	 * @param int $itemsPerPage - How many items per page should show up
	 * @return GridFieldConfig_ManyManyEditor
	 */
	public static function create($fieldToSearch, $itemsPerPage=15){
		return new GridFieldConfig_ManyManyEditor($fieldToSearch, $itemsPerPage=15);
	}

	/**
	 *
	 * @param string $fieldToSearch - Which field on the object should be searched for
	 * @param int $itemsPerPage - How many items per page should show up
	 */
	public function __construct($fieldToSearch, $itemsPerPage=15) {
		$this->addComponent(new GridFieldRelationAdd($fieldToSearch));
		$this->addComponent(new GridFieldSortableHeader());
		$this->addComponent(new GridFieldFilter());
		$this->addComponent(new GridFieldDefaultColumns());
		$this->addComponent(new GridFieldAction_Edit());
		$this->addComponent(new GridFieldRelationDelete());
		$this->addComponent(new GridFieldPaginator($itemsPerPage));
		$this->addComponent(new GridFieldPopupForms());
	}
}