<?php

namespace App\User\UseCases\SignupUser;

use App\Auth\Clock;
use App\Email\EmailConfirmationToken\CreateEmailConfirmationTokenDto;
use App\Email\EmailConfirmationToken\EmailConfirmationTokenRepository;
use App\Email\Emailer;
use App\Email\EmailFactory;
use App\Exceptions\BadRequestException;
use App\Shared\ValueObject\EmailAddress;
use App\User\CreateUserDto;
use App\User\User;
use App\User\UserRepository;
use DomainException;
use InvalidArgumentException;

class SignupUser
{
    private const DISPLAY_NAME_PATTERN = '/^[a-z0-9_-]{3,30}$/';

    private const TOKEN_LIFETIME = '+1 day';

    public function __construct(
        private UserRepository $userRepo,
        private EmailConfirmationTokenRepository $tokenRepo,
        private Emailer $emailer,
        private EmailFactory $emailFactory,
        private Clock $clock,
        private string $fromAddress,
    ) {}

    /**
     * @throws BadRequestException
     * @throws DomainException
     */
    public function execute(SignupUserRequest $request): User
    {
        if ($request->email === null || $request->email === '') {
            throw new BadRequestException('email is required');
        }
        if ($request->displayName === null || $request->displayName === '') {
            throw new BadRequestException('displayName is required');
        }
        if (
            preg_match(
                self::DISPLAY_NAME_PATTERN,
                $request->displayName,
            ) !== 1
        ) {
            throw new BadRequestException(
                'displayName must be 3-30 chars of [a-z0-9_-]'
            );
        }

        try {
            $email = new EmailAddress($request->email);
        } catch (InvalidArgumentException $exception) {
            throw new BadRequestException($exception->getMessage());
        }

        if ($this->userRepo->findByEmail($email) !== null) {
            throw new DomainException('email already registered');
        }
        if ($this->userRepo->findByDisplayName($request->displayName) !== null) {
            throw new DomainException('displayName already taken');
        }

        $user = $this->userRepo->create(new CreateUserDto(
            email: $email,
            displayName: $request->displayName,
            passwordHash: '',
            isAdmin: false,
            emailConfirmedAt: null,
        ));

        $token = $this->tokenRepo->create(new CreateEmailConfirmationTokenDto(
            user: $user,
            availableTo: $this->clock->now()->modify(self::TOKEN_LIFETIME),
        ));

        $this->emailer->send(
            $this->fromAddress,
            $user->getEmail()->value(),
            $this->emailFactory->makeConfirmationEmail($token->getToken()),
        );

        return $user;
    }
}