<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\Post;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;

class PostViewService
{
    protected CacheService $cacheService;

    public function __construct(CacheService $cacheService)
    {
        $this->cacheService = $cacheService;
    }

    public function recordView(Post $post, string $visitorId): void
    {
        $cacheKey = "post:{$post->id}:visitor:{$visitorId}";
        
        if (!Cache::has($cacheKey)) {
            DB::transaction(function () use ($post) {
                $post->increment('views');
            });
            
            // 设置24小时内同一访客不重复计数
            Cache::put($cacheKey, true, now()->addHours(24));
        }
    }

    public function getPopularPosts(int $limit = 10): array
    {
        return $this->cacheService
            ->tags(['posts', 'popular'])
            ->remember('posts:popular', function () use ($limit) {
                return Post::orderByDesc('views')
                    ->limit($limit)
                    ->get()
                    ->map(fn($post) => [
                        'id' => $post->id,
                        'title' => $post->title,
                        'views' => $post->views,
                    ])
                    ->toArray();
            });
    }
}