<?php
namespace App\Services\CompanyNews;

use App\Models\CompanyNews;
use HTMLPurifier;
use HTMLPurifier_Config;
use Illuminate\Support\Facades\DB;
use RuntimeException;

class NewsEditor
{
    public function save(int $id, int $version, array $input, ?int $actor): CompanyNews
    {
        return DB::transaction(function () use ($id, $version, $input, $actor) {
            $news = $this->locked($id, $version);
            $config = HTMLPurifier_Config::createDefault();
            $config->set('Cache.DefinitionImpl', null);
            $config->set('URI.AllowedSchemes', ['http' => true, 'https' => true, 'mailto' => true]);
            $html = (new HTMLPurifier($config))->purify($input['content_html'] ?? '');
            $news->fill([
                'title' => $input['title'], 'summary' => $input['summary'] ?? null,
                'content_html' => $html, 'content_source' => 'manual',
                'content_updated_by' => $actor, 'content_updated_at' => now(),
                'is_visible' => false, 'visible_at' => null, 'version' => $version + 1,
            ])->save();
            $this->log($news, $actor, 'edit', ['version' => $news->version, 'content_hash' => hash('sha256', $html)]);
            return $news;
        });
    }

    public function review(int $id, int $version, string $status, ?string $note, ?int $actor): CompanyNews
    {
        return DB::transaction(function () use ($id, $version, $status, $note, $actor) {
            $news = $this->locked($id, $version);
            $from = $news->review_status;
            $news->fill([
                'review_status' => $status, 'review_note' => $note,
                'reviewed_by' => $actor, 'reviewed_at' => now(),
                'is_visible' => false, 'visible_at' => null, 'version' => $version + 1,
            ])->save();
            $this->log($news, $actor, 'review', ['from' => $from, 'to' => $status, 'note' => $note]);
            return $news;
        });
    }

    private function locked(int $id, int $version): CompanyNews
    {
        $news = CompanyNews::whereKey($id)->lockForUpdate()->first();
        if (!$news) {
            throw new RuntimeException('新闻不存在');
        }
        if ($news->version !== $version) {
            throw new RuntimeException('新闻已被其他管理员修改，请重新打开后操作');
        }
        return $news;
    }

    private function log(CompanyNews $news, ?int $actor, string $action, array $detail): void
    {
        DB::table('company_news_logs')->insert([
            'news_id' => $news->id, 'actor_id' => $actor, 'action' => $action,
            'detail' => json_encode($detail, JSON_UNESCAPED_UNICODE), 'created_at' => now(),
        ]);
    }
}