<?php

namespace FluentForm\App\Services\FormBuilder;

use Closure;

class Components implements \JsonSerializable
{
	/**
	 * $items [Components list]
	 * @var array
	 */
	protected $items = array();

	/**
	 * Build the object instance
	 * @param array $items
	 */
	public function __construct(array $items)
	{
		$this->items = $items;
	}

	/**
	 * Add a component into list [$items]
	 * @param string $name
	 * @param array  $component
	 * @param string $group ['general'|'advanced']
	 * @return $this
	 */
	public function add($name, array $component, $group)
	{
		if (isset($this->items[$group])) {
			$this->items[$group][$name] = $component;
		}

		return $this;
	}

	/**
	 * Remove a component from the list [$items]
	 * @param  string $name
	 * @param  string $group ['general'|'advanced']
	 * @return $this
	 */
	public function remove($name, $group)
	{
		if (isset($this->items[$group])) {
			unset($this->items[$group][$name]);
		}

		return $this;
	}

	/**
	 * Modify an existing component
	 * @param  string $name
	 * @param  Closure $callback [to modify the component within]
	 * @param  string $group
	 * @return $this
	 */
	public function update($name, Closure $callback, $group)
	{
		$element = $callback($this->items[$group][$name]);
		$this->items[$group][$name] = $element;
		return $this;
	}

	/**
	 * Sort the components in list [$items]
	 * @param  string $sortBy [key to sort by]
	 * @return $this
	 */
	public function sort($sortBy = 'index')
	{
		foreach ($this->items as $group => &$items) {
			usort($items, function($a, $b) {
				if (@$a['index'] == @$b['index']) {
					return 0;
				}
				return @$a['index'] < @$b['index'] ? -1 : 1;
	        });
		}
		
		return $this;
	}

	/**
	 * Return array [$items]
	 * @return array
	 */
	public function toArray()
	{
		return $this->items;
	}

	/**
	 * Return array [$items]
	 * @return array
	 */
	public function jsonSerialize()
	{
		return $this->toArray();
	}

	/**
	 * Getter to hook proxy call
	 * @return mixed
	 */
	public function __get($key)
	{
		if (in_array($key, ['general', 'advanced'])) {
			return new GroupSetterProxy($this, $key);
		}
	}
}