<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\Post;
use App\Models\User;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Database\Eloquent\Builder;

class PostService
{
    public function getPosts(array $filters = []): LengthAwarePaginator
    {
        $query = Post::with(['author:id,name', 'category:id,name']);

        $query = $this->applyFilters($query, $filters);

        return $query->latest()->paginate(10);
    }

    public function createPost(User $user, array $data): Post
    {
        return $user->posts()->create($data);
    }

    public function updatePost(Post $post, array $data): Post
    {
        $post->update($data);
        return $post->fresh();
    }

    protected function applyFilters(Builder $query, array $filters): Builder
    {
        if (!empty($filters['author_id'])) {
            $query->where('author_id', $filters['author_id']);
        }

        if (!empty($filters['category'])) {
            $query->whereHas('category', function ($q) use ($filters) {
                $q->where('name', $filters['category']);
            });
        }

        if (!empty($filters['search'])) {
            $query->where(function ($q) use ($filters) {
                $q->where('title', 'like', "%{$filters['search']}%")
                  ->orWhere('content', 'like', "%{$filters['search']}%");
            });
        }

        return $query;
    }
}