<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Category;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use App\Http\Resources\CategoryResource;
use App\Http\Resources\PostResource;

class CategoryController extends Controller
{
    public function index(): JsonResponse
    {
        $categories = Category::withCount('posts')->get();
        
        return response()->json([
            'categories' => CategoryResource::collection($categories)
        ]);
    }

    public function store(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255|unique:categories',
            'description' => 'nullable|string',
        ]);

        $category = Category::create($validated);

        return response()->json([
            'message' => 'Category created successfully',
            'category' => $category
        ]);
    }

    public function update(Request $request, Category $category): JsonResponse
    {
        $validated = $request->validate([
            'name' => 'sometimes|string|max:255|unique:categories,name,' . $category->id,
            'description' => 'nullable|string',
        ]);

        $category->update($validated);

        return response()->json([
            'message' => 'Category updated successfully',
            'category' => $category
        ]);
    }

    public function destroy(Category $category): JsonResponse
    {
        $category->delete();

        return response()->json([
            'message' => 'Category deleted successfully'
        ]);
    }

    public function posts(Category $category, Request $request): JsonResponse
    {
        $perPage = $request->input('per_page', 10);
        $perPage = min($perPage, 100);

        $posts = $category->posts()
            ->with(['author:id,name'])
            ->latest()
            ->paginate($perPage);

        return response()->json([
            'posts' => PostResource::collection($posts),
            'pagination' => [
                'total' => $posts->total(),
                'per_page' => $posts->perPage(),
                'current_page' => $posts->currentPage(),
                'last_page' => $posts->lastPage(),
            ]
        ]);
    }
}