<?php

namespace App\Http\Controllers\Api\Blog;

use App\Http\Controllers\Controller;
use App\Http\Requests\Blog\StoreCategoryRequest;
use App\Http\Requests\Blog\UpdateCategoryRequest;
use App\Http\Resources\CategoryResource;
use App\Http\Resources\PostResource;
use App\Models\Blog\Category;
use Illuminate\Http\Request;

/**
 * @OA\Tag(name="Categories", description="Blog categories")
 */
class CategoryController extends Controller
{
    /**
     * @OA\Get(
     *     path="/blog/categories",
     *     tags={"Categories"},
     *     summary="Paginated list of categories",
     *     @OA\Parameter(name="per_page", in="query", @OA\Schema(type="integer")),
     *     @OA\Parameter(name="filter", in="query", @OA\Schema(type="string")),
     *     @OA\Response(response=200, description="OK")
     * )
     */
    public function index(Request $request)
    {
        $filter = $request->input('filter');
        $sortBy = $request->input('sort_by', 'created_at');
        $sortDirection = $request->input('sort_direction', 'desc');
        $perPage = $request->input('per_page', 10);

        $query = Category::with('posts');

        if (!empty($filter)) {
            $query->where('name', 'like', '%' . $filter . '%');
        }

        $query->orderBy($sortBy, $sortDirection);

        $categories = $query->paginate($perPage);

        return CategoryResource::collection($categories);
    }

    /**
     * @OA\Get(
     *     path="/blog/categories/{id}",
     *     tags={"Categories"},
     *     summary="Get a category by ID",
     *     @OA\Parameter(name="id", in="path", required=true, @OA\Schema(type="integer")),
     *     @OA\Response(response=200, description="OK")
     * )
     */
    public function show($id)
    {
        $category = Category::with('posts')->findOrFail($id);
        return new CategoryResource($category);
    }

    /**
     * @OA\Get(
     *     path="/blog/categories/{slug}/posts",
     *     tags={"Categories"},
     *     summary="Get posts by category slug",
     *     @OA\Parameter(name="slug", in="path", required=true, @OA\Schema(type="string")),
     *     @OA\Parameter(name="per_page", in="query", @OA\Schema(type="integer")),
     *     @OA\Response(response=200, description="OK"),
     *     @OA\Response(response=404, description="Category not found")
     * )
     */
    public function getCategoryWithPosts(Request $request, $slug)
    {
        $category = Category::where('slug', $slug)->first();

        if (!$category) {
            return response()->json([
                'message' => 'Category not found.'
            ], 404);
        }

        $perPage = $request->input('per_page', 10);
        $filter = $request->input('filter');
        $sortBy = $request->input('sort_by', 'published_at');
        $sortDirection = $request->input('sort_direction', 'desc');

        $postsQuery = $category->posts()->with(['category', 'tags', 'author']);

        if (!empty($filter)) {
            $postsQuery->where('title', 'like', '%' . $filter . '%');
        }

        $postsQuery->orderBy($sortBy, $sortDirection);

        $posts = $postsQuery->paginate($perPage);

        $meta = [
            'total' => $posts->total(),
            'per_page' => $posts->perPage(),
            'current_page' => $posts->currentPage(),
            'last_page' => $posts->lastPage(),
            'from' => $posts->firstItem(),
            'to' => $posts->lastItem(),
        ];

        $links = [
            'first' => $posts->url(1),
            'last' => $posts->url($posts->lastPage()),
            'prev' => $posts->previousPageUrl(),
            'next' => $posts->nextPageUrl(),
        ];

        return response()->json([
            'category' => new CategoryResource($category),
            'posts' => PostResource::collection($posts),
            'meta' => $meta,
            'links' => $links,
        ], 200);
    }

    /**
     * @OA\Post(
     *     path="/blog/categories",
     *     tags={"Categories"},
     *     summary="Create a category",
     *     @OA\RequestBody(@OA\MediaType(mediaType="application/json")),
     *     @OA\Response(response=201, description="Created")
     * )
     */
    public function store(StoreCategoryRequest $request)
    {
        $category = Category::create($request->validated());
        return new CategoryResource($category);
    }

    /**
     * @OA\Put(
     *     path="/blog/categories/{id}",
     *     tags={"Categories"},
     *     summary="Update a category",
     *     @OA\Parameter(name="id", in="path", required=true, @OA\Schema(type="integer")),
     *     @OA\RequestBody(@OA\MediaType(mediaType="application/json")),
     *     @OA\Response(response=200, description="OK")
     * )
     */
    public function update(UpdateCategoryRequest $request, $id)
    {
        $category = Category::findOrFail($id);
        $category->update($request->validated());
        return new CategoryResource($category);
    }

    /**
     * @OA\Delete(
     *     path="/blog/categories/{id}",
     *     tags={"Categories"},
     *     summary="Delete a category",
     *     @OA\Parameter(name="id", in="path", required=true, @OA\Schema(type="integer")),
     *     @OA\Response(response=200, description="OK")
     * )
     */
    public function destroy($id)
    {
        $category = Category::findOrFail($id);
        $category->delete();
        return response()->json(['message' => 'Category deleted successfully'], 200);
    }
}