<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\Post;
use App\Models\User;
use App\Models\Category;
use Illuminate\Support\Facades\DB;

class StatisticsService
{
    protected CacheService $cacheService;

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

    public function getPostStatistics(): array
    {
        return $this->cacheService->remember('statistics:posts', function () {
            return [
                'total_posts' => Post::count(),
                'posts_by_category' => $this->getPostsByCategory(),
                'posts_by_author' => $this->getPostsByAuthor(),
                'most_commented' => $this->getMostCommentedPosts(),
                'recent_posts' => $this->getRecentPosts(),
            ];
        });
    }

    protected function getPostsByCategory(): array
    {
        return Category::withCount('posts')
            ->orderByDesc('posts_count')
            ->get()
            ->map(fn($category) => [
                'name' => $category->name,
                'count' => $category->posts_count,
            ])
            ->toArray();
    }

    protected function getPostsByAuthor(): array
    {
        return User::withCount('posts')
            ->orderByDesc('posts_count')
            ->limit(10)
            ->get()
            ->map(fn($user) => [
                'name' => $user->name,
                'count' => $user->posts_count,
            ])
            ->toArray();
    }

    protected function getMostCommentedPosts(): array
    {
        return Post::withCount('comments')
            ->orderByDesc('comments_count')
            ->limit(5)
            ->get()
            ->map(fn($post) => [
                'title' => $post->title,
                'comments_count' => $post->comments_count,
            ])
            ->toArray();
    }

    protected function getRecentPosts(): array
    {
        return Post::latest()
            ->limit(5)
            ->get()
            ->map(fn($post) => [
                'title' => $post->title,
                'created_at' => $post->created_at,
            ])
            ->toArray();
    }
}