<?php

namespace App\Controllers;

use App\Exceptions\BadRequestException;
use App\Exceptions\ForbiddenException;
use App\Post\Post;
use App\Post\UseCases\CreatePost\CreatePost;
use App\Post\UseCases\CreatePost\CreatePostRequest;
use App\Post\UseCases\DeletePost\DeletePost;
use App\Post\UseCases\DeletePost\DeletePostRequest;
use App\Post\UseCases\GetPost\GetPost;
use App\Post\UseCases\ListRecentPosts\ListRecentPosts;
use App\Post\UseCases\ListRecentPosts\ListRecentPostsRequest;
use App\Post\UseCases\ListUserPosts\ListUserPosts;
use App\Post\UseCases\ListUserPosts\ListUserPostsRequest;
use App\User\User;
use App\User\UserRepository;
use DomainException;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class PostController
{
    private const RECENT_LIMIT = 20;

    public function __construct(
        private CreatePost $createPost,
        private DeletePost $deletePost,
        private GetPost $getPost,
        private ListRecentPosts $listRecentPosts,
        private ListUserPosts $listUserPosts,
        private UserRepository $userRepo,
    ) {}

    public function recent(Request $request): JsonResponse
    {
        try {
            $posts = $this->listRecentPosts->execute(
                new ListRecentPostsRequest(limit: self::RECENT_LIMIT),
            );
        } catch (BadRequestException $exception) {
            return new JsonResponse(
                ['error' => $exception->getMessage()], 400,
            );
        }

        return new JsonResponse([
            'posts' => array_map(
                function (Post $post) {
                    return $this->serialize($post);
                },
                $posts,
            ),
        ], 200);
    }

    public function show(Request $request, int $id): JsonResponse
    {
        try {
            $post = $this->getPost->execute($id);
        } catch (BadRequestException $exception) {
            return new JsonResponse(
                ['error' => $exception->getMessage()], 400,
            );
        }
        if ($post === null) {
            return new JsonResponse(['error' => 'post not found'], 404);
        }

        return new JsonResponse([
            'post' => $this->serialize($post),
        ], 200);
    }

    public function listByUser(
        Request $request,
        string $displayName,
    ): JsonResponse {
        $user = $this->userRepo->findByDisplayName($displayName);
        if ($user === null) {
            return new JsonResponse(['error' => 'user not found'], 404);
        }
        try {
            $posts = $this->listUserPosts->execute(
                new ListUserPostsRequest(userId: $user->getId()),
            );
        } catch (BadRequestException $exception) {
            return new JsonResponse(
                ['error' => $exception->getMessage()], 400,
            );
        }

        return new JsonResponse([
            'user' => [
                'id' => $user->getId(),
                'displayName' => $user->getDisplayName(),
            ],
            'posts' => array_map(
                function (Post $post) {
                    return $this->serialize($post);
                },
                $posts,
            ),
        ], 200);
    }

    public function create(Request $request): JsonResponse
    {
        /** @var User $user */
        $user = $request->attributes->get('user');
        try {
            $post = $this->createPost->execute(new CreatePostRequest(
                userId: $user->getId(),
                title: $request->input('title'),
                body: $request->input('body'),
            ));
        } catch (BadRequestException $exception) {
            return new JsonResponse(
                ['error' => $exception->getMessage()], 400,
            );
        }

        return new JsonResponse([
            'post' => $this->serialize($post),
        ], 201);
    }

    public function delete(Request $request, int $id): JsonResponse
    {
        /** @var User $user */
        $user = $request->attributes->get('user');
        try {
            $this->deletePost->execute(new DeletePostRequest(
                postId: $id,
                requesterId: $user->getId(),
                requesterIsAdmin: $user->isAdmin(),
            ));
        } catch (BadRequestException $exception) {
            return new JsonResponse(
                ['error' => $exception->getMessage()], 400,
            );
        } catch (ForbiddenException $exception) {
            return new JsonResponse(
                ['error' => $exception->getMessage()], 403,
            );
        } catch (DomainException $exception) {
            return new JsonResponse(
                ['error' => $exception->getMessage()], 409,
            );
        }

        return new JsonResponse(null, 204);
    }

    /**
     * @return array{
     *     id: int,
     *     userId: int,
     *     authorDisplayName: string,
     *     title: string,
     *     body: string,
     *     createdAt: string
     * }
     */
    private function serialize(Post $post): array
    {
        $author = $this->userRepo->find($post->getUserId());

        return [
            'id' => $post->getId(),
            'userId' => $post->getUserId(),
            'authorDisplayName' => $author === null
                ? ''
                : $author->getDisplayName(),
            'title' => $post->getTitle(),
            'body' => $post->getBody(),
            'createdAt' => $post->getCreatedAt()->format(DATE_ATOM),
        ];
    }
}