<?php

namespace Kirby\Cms;

use Kirby\Exception\InvalidArgumentException;

/**
 * The FilePicker class helps to
 * fetch the right files for the API calls
 * for the file picker component in the panel.
 *
 * @package   Kirby Cms
 * @author    Bastian Allgeier <bastian@getkirby.com>
 * @link      https://getkirby.com
 * @copyright Bastian Allgeier GmbH
 * @license   https://getkirby.com/license
 */
class FilePicker extends Picker
{
    /**
     * Extends the basic defaults
     *
     * @return array
     */
    public function defaults(): array
    {
        $defaults = parent::defaults();
        $defaults['text'] = '{{ file.filename }}';

        return $defaults;
    }

    /**
     * Search all files for the picker
     *
     * @return \Kirby\Cms\Files|null
     * @throws \Kirby\Exception\InvalidArgumentException
     */
    public function items()
    {
        $model = $this->options['model'];

        // find the right default query
        if (empty($this->options['query']) === false) {
            $query = $this->options['query'];
        } elseif (is_a($model, 'Kirby\Cms\File') === true) {
            $query = 'file.siblings';
        } else {
            $query = $model::CLASS_ALIAS . '.files';
        }

        // fetch all files for the picker
        $files = $model->query($query);

        // help mitigate some typical query usage issues
        // by converting site and page objects to proper
        // pages by returning their children
        if (is_a($files, 'Kirby\Cms\Site') === true) {
            $files = $files->files();
        } elseif (is_a($files, 'Kirby\Cms\Page') === true) {
            $files = $files->files();
        } elseif (is_a($files, 'Kirby\Cms\User') === true) {
            $files = $files->files();
        } elseif (is_a($files, 'Kirby\Cms\Files') === false) {
            throw new InvalidArgumentException('Your query must return a set of files');
        }

        // search
        $files = $this->search($files);

        // paginate
        return $this->paginate($files);
    }
}