<?php
defined('ABSPATH') || exit();

final class APEARI_Content_Document
{
    public static function schema(): array
    {
        $string = ['type' => 'string'];
        $object = static fn($properties) => [
            'type' => 'object',
            'properties' => $properties,
            'required' => array_keys($properties),
            'additionalProperties' => false,
        ];
        return $object([
            'title' => $string,
            'slug' => $string,
            'excerpt' => $string,
            'blocks' => [
                'type' => 'array',
                'items' => $object([
                    'type' => ['type' => 'string', 'enum' => ['paragraph', 'heading', 'list', 'quote']],
                    'text' => $string,
                    'level' => ['type' => 'integer', 'enum' => [2, 3]],
                    'items' => ['type' => 'array', 'items' => $string],
                ]),
            ],
            'seo' => $object(['title' => $string, 'description' => $string, 'keyword' => $string]),
        ]);
    }

    public static function validate($data)
    {
        $invalid = static fn() => new WP_Error(
            'apeari_content_document',
            __('AI zwróciło nieprawidłową treść. Nie utworzono nowego szkicu.', 'apeari'),
            ['status' => 502],
        );
        if (
            !is_array($data) ||
            array_diff(array_keys($data), ['title', 'slug', 'excerpt', 'blocks', 'seo'])
        ) {
            return $invalid();
        }
        foreach (['title' => 250, 'slug' => 250, 'excerpt' => 2000] as $field => $limit) {
            if (!is_string($data[$field] ?? null) || mb_strlen($data[$field]) > $limit) {
                return $invalid();
            }
        }
        $title = sanitize_text_field($data['title']);
        if (
            '' === trim($title) ||
            !is_array($data['blocks'] ?? null) ||
            !$data['blocks'] ||
            count($data['blocks']) > 80 ||
            !is_array($data['seo'] ?? null)
        ) {
            return $invalid();
        }
        $seo = [];
        foreach (['title' => 250, 'description' => 500, 'keyword' => 200] as $field => $limit) {
            if (!is_string($data['seo'][$field] ?? null) || mb_strlen($data['seo'][$field]) > $limit) {
                return $invalid();
            }
            $seo[$field] = sanitize_text_field($data['seo'][$field]);
        }
        $content = [];
        foreach ($data['blocks'] as $block) {
            if (
                !is_array($block) ||
                !is_string($block['text'] ?? null) ||
                strlen($block['text']) > 12000 ||
                !in_array($block['level'] ?? null, [2, 3], true) ||
                !is_array($block['items'] ?? null) ||
                count($block['items']) > 40
            ) {
                return $invalid();
            }
            $text = esc_html(sanitize_textarea_field($block['text']));
            switch ($block['type'] ?? '') {
                case 'paragraph':
                    $html = get_comment_delimited_block_content('core/paragraph', [], '<p>' . $text . '</p>');
                    break;
                case 'heading':
                    $level = $block['level'];
                    $html = get_comment_delimited_block_content(
                        'core/heading',
                        2 === $level ? [] : ['level' => $level],
                        '<h' . $level . ' class="wp-block-heading">' . $text . '</h' . $level . '>',
                    );
                    break;
                case 'quote':
                    $html = get_comment_delimited_block_content(
                        'core/quote',
                        [],
                        '<blockquote class="wp-block-quote">' .
                            get_comment_delimited_block_content(
                                'core/paragraph',
                                [],
                                '<p>' . $text . '</p>',
                            ) .
                            '</blockquote>',
                    );
                    break;
                case 'list':
                    if (!$block['items']) {
                        return $invalid();
                    }
                    $items = [];
                    foreach ($block['items'] as $item) {
                        if (!is_string($item) || strlen($item) > 2000) {
                            return $invalid();
                        }
                        $items[] = get_comment_delimited_block_content(
                            'core/list-item',
                            [],
                            '<li>' . esc_html(sanitize_text_field($item)) . '</li>',
                        );
                    }
                    $html = get_comment_delimited_block_content(
                        'core/list',
                        [],
                        '<ul class="wp-block-list">' . implode('', $items) . '</ul>',
                    );
                    break;
                default:
                    return $invalid();
            }
            if ('list' !== $block['type'] && '' === trim($text)) {
                return $invalid();
            }
            $content[] = $html;
        }
        $content = implode("\n\n", $content);
        if (strlen($content) > 120000) {
            return $invalid();
        }
        return [
            'title' => $title,
            'slug' => sanitize_title($data['slug'] ?: $title),
            'excerpt' => sanitize_textarea_field($data['excerpt']),
            'content' => $content,
            'seo' => $seo,
        ];
    }
}