<?php

namespace Kirby\Cms;

use Kirby\Exception\InvalidArgumentException;

/**
 * The Structure class wraps
 * array data into a nicely chainable
 * collection with objects and Kirby-style
 * content with fields. The Structure class
 * is the heart and soul of our yaml conversion
 * method for pages.
 *
 * @package   Kirby Cms
 * @author    Bastian Allgeier <bastian@getkirby.com>
 * @link      https://getkirby.com
 * @copyright Bastian Allgeier
 * @license   https://getkirby.com/license
 */
class Structure extends Collection
{
    /**
     * Creates a new Collection with the given objects
     *
     * @param array $objects Kirby\Cms\StructureObject` objects or props arrays
     * @param object|null $parent
     */
    public function __construct($objects = [], $parent = null)
    {
        $this->parent = $parent;
        $this->set($objects);
    }

    /**
     * The internal setter for collection items.
     * This makes sure that nothing unexpected ends
     * up in the collection. You can pass arrays or
     * StructureObjects
     *
     * @param string $id
     * @param array|StructureObject $props
     * @throws \Kirby\Exception\InvalidArgumentException
     */
    public function __set(string $id, $props)
    {
        if (is_a($props, 'Kirby\Cms\StructureObject') === true) {
            $object = $props;
        } else {
            if (is_array($props) === false) {
                throw new InvalidArgumentException('Invalid structure data');
            }

            $object = new StructureObject([
                'content'    => $props,
                'id'         => $props['id'] ?? $id,
                'parent'     => $this->parent,
                'structure'  => $this
            ]);
        }

        return parent::__set($object->id(), $object);
    }
}
