<?php

declare(strict_types=1);

namespace LIT\MCP\Integrations\Divi\Design;

use LIT\MCP\Abilities\Errors;
use LIT\MCP\Integrations\Divi\Release\DiviFeature;
use WP_Error;

defined('ABSPATH') || exit;

/**
 * Restores a snapshot of the custom CSS: the whole text of that moment replaces the current one. A snapshot belongs to
 * one theme – with another theme active it is refused, since it would land in the other theme's CSS. The text is not
 * run through CustomCssGuard: it is what the site had before (or what an earlier, checked change wrote), and a way
 * back must not be blocked by what was there already. Rights and Divi features are those of the update.
 */
final class CustomCssRestorePlanner implements RestorePlanner
{
    public function __construct(private CustomCssStore $store, private ThemeOptionsAdapter $options)
    {
    }

    public function area(): string
    {
        return 'custom_css';
    }

    public function designArea(): DesignArea
    {
        return new CustomCssArea($this->store);
    }

    public function rights(): ?WP_Error
    {
        return DesignRights::customCss($this->options);
    }

    public function features(): array
    {
        return [DiviFeature::ThemeOptionRead, DiviFeature::ThemeOptionWrite];
    }

    public function plan(array $current, array $snapshot, string $snapshotId): DesignPlan|WP_Error
    {
        $stylesheet = (string) ($current['stylesheet'] ?? '');
        if ((string) ($snapshot['stylesheet'] ?? '') !== $stylesheet) {
            return Errors::invalidInput(
                sprintf(
                    'Der Snapshot gehört zum Theme „%s“, aktiv ist „%s“; nichts wurde gespeichert.',
                    (string) ($snapshot['stylesheet'] ?? '?'),
                    $stylesheet
                ),
                ['snapshot' => 'Das passende Theme aktivieren oder einen Snapshot dieses Themes wählen.']
            );
        }

        $before = (string) ($current['css'] ?? '');
        $after = (string) ($snapshot['css'] ?? '');

        return new DesignPlan(
            ['stylesheet' => $stylesheet, 'css' => $after],
            CustomCssDiff::between($before, $after),
            sprintf('Snapshot %s wiederherstellen – %s', $snapshotId, CustomCssDiff::summary($before, $after)),
            null,
            $before === $after ? [] : [CustomCssArea::SITE_WIDE],
            true
        );
    }
}