<?php

namespace App\Http\Controllers\Api\Blog;

use App\Http\Controllers\Controller;
use App\Http\Requests\Blog\StorePostRequest;
use App\Http\Requests\Blog\UpdatePostRequest;
use App\Http\Resources\PostResource;
use App\Models\Blog\Post;
use Illuminate\Http\Request;

/**
 * @OA\Tag(name="Posts", description="Blog post management")
 */
class PostController extends Controller
{
    /**
     * @OA\Get(
     *     path="/blog/posts",
     *     tags={"Posts"},
     *     summary="Paginated list of posts",
     *     @OA\Parameter(name="per_page", in="query", @OA\Schema(type="integer")),
     *     @OA\Parameter(name="category", in="query", @OA\Schema(type="string")),
     *     @OA\Parameter(name="tag", in="query", @OA\Schema(type="string")),
     *     @OA\Parameter(name="search", in="query", @OA\Schema(type="string")),
     *     @OA\Parameter(name="sort_field", in="query", @OA\Schema(type="string")),
     *     @OA\Parameter(name="sort_direction", in="query", @OA\Schema(type="string", enum={"asc","desc"})),
     *     @OA\Response(response=200, description="OK")
     * )
     */
    public function index(Request $request)
    {
        $filters = $request->only(['category', 'tag', 'search', 'author', 'published']);

        $sortField = $request->get('sort_field', 'published_at');
        $sortDirection = $request->get('sort_direction', 'desc');

        $perPage = $request->get('per_page', 10);

        $query = Post::with(['category', 'tags', 'author'])
            ->filter($filters)
            ->sort($sortField, $sortDirection);

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

        return PostResource::collection($posts);
    }

    /**
     * @OA\Get(
     *     path="/blog/posts/{slug}",
     *     tags={"Posts"},
     *     summary="Get a single post by slug with related posts",
     *     @OA\Parameter(name="slug", in="path", required=true, @OA\Schema(type="string")),
     *     @OA\Response(response=200, description="OK")
     * )
     */
    public function show($slug)
    {
        $post = Post::with(['category', 'tags', 'author', 'relatedPosts.category', 'relatedPosts.tags', 'relatedPosts.author'])
            ->where('slug', $slug)
            ->firstOrFail();

        return response()->json([
            'post' => new PostResource($post),
            'related_posts' => PostResource::collection($post->relatedPosts->sortByDesc('published_at')->take(5)),
        ], 200);
    }

    /**
     * @OA\Post(
     *     path="/blog/posts",
     *     tags={"Posts"},
     *     summary="Create a post",
     *     @OA\RequestBody(@OA\MediaType(mediaType="application/json")),
     *     @OA\Response(response=201, description="Created")
     * )
     */
    public function store(StorePostRequest $request)
    {
        $post = Post::create($request->validated());

        if ($request->has('tags')) {
            $post->tags()->attach($request->tags);
        }

        return new PostResource($post->load(['category', 'tags', 'author']));
    }

    /**
     * @OA\Put(
     *     path="/blog/posts/{id}",
     *     tags={"Posts"},
     *     summary="Update a post",
     *     @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(UpdatePostRequest $request, $id)
    {
        $post = Post::findOrFail($id);
        $post->update($request->validated());

        if ($request->has('tags')) {
            $post->tags()->sync($request->tags);
        }

        return new PostResource($post->load(['category', 'tags', 'author']));
    }

    /**
     * @OA\Delete(
     *     path="/blog/posts/{id}",
     *     tags={"Posts"},
     *     summary="Delete a post",
     *     @OA\Parameter(name="id", in="path", required=true, @OA\Schema(type="integer")),
     *     @OA\Response(response=200, description="OK")
     * )
     */
    public function destroy($id)
    {
        $post = Post::findOrFail($id);
        $post->tags()->detach();
        $post->relatedPosts()->detach();
        $post->delete();

        return response()->json(['message' => 'Post deleted successfully'], 200);
    }
}