<?php

namespace App\User;

use App\User\UseCases\CreateUserDto;
use App\ValueObjects\EmailAddress;

class JsonUserRepository implements UserRepository
{
    private string $filePath;

    public function __construct()
    {
        $this->filePath = __DIR__ . '/../../data/users.json';
    }

    public function create(CreateUserDto $dto): User
    {
        $users = $this->readUsers();
        $id = $this->getNextId($users);

        $users[] = [
            'id' => $id,
            'email' => (string) $dto->email,
        ];
        $this->writeUsers($users);

        return new User(
            id: $id,
            email: $dto->email,
        );
    }

    public function find(int $id): ?User
    {
        $users = $this->readUsers();

        foreach ($users as $data) {
            if ($data['id'] === $id) {
                return new User(
                    id: $data['id'],
                    email: new EmailAddress($data['email']),
                );
            }
        }

        return null;
    }

    private function readUsers(): array
    {
        if (!file_exists($this->filePath)) {
            return [];
        }

        $content = file_get_contents($this->filePath);

        return json_decode($content, true) ?? [];
    }

    private function writeUsers(array $users): void
    {
        file_put_contents(
            $this->filePath,
            json_encode($users, JSON_PRETTY_PRINT)
        );
    }

    private function getNextId(array $users): int
    {
        if (empty($users)) {
            return 0;
        }

        $maxId = -1;
        foreach ($users as $user) {
            if ($user['id'] > $maxId) {
                $maxId = $user['id'];
            }
        }

        return $maxId + 1;
    }
}