<?php

namespace App\User\UseCases\SignupUser;

use App\Auth\PasswordHasher;
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 MIN_PASSWORD_LENGTH = 8;

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

    public function __construct(
        private UserRepository $userRepo,
        private PasswordHasher $hasher,
    ) {}

    /**
     * @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,
                $request->displayName,
            ) !== 1
        ) {
            throw new BadRequestException(
                'displayName must be 3-30 chars of [a-z0-9_-]'
            );
        }
        if ($request->password === null || $request->password === '') {
            throw new BadRequestException('password is required');
        }
        if (strlen($request->password) < self::MIN_PASSWORD_LENGTH) {
            throw new BadRequestException(
                'password must be at least '.self::MIN_PASSWORD_LENGTH.' characters'
            );
        }

        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');
        }

        return $this->userRepo->create(new CreateUserDto(
            email: $email,
            displayName: $request->displayName,
            passwordHash: $this->hasher->hash($request->password),
            isAdmin: false,
            emailConfirmedAt: null,
        ));
    }
}