<?php

namespace App\Auth;

use DateTimeImmutable;

class JsonSessionRepository implements SessionRepository
{
    private string $filePath;

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

    public function create(CreateSessionDto $dto): Session
    {
        $sessions = $this->readSessions();

        $sessions[] = [
            'token' => $dto->token,
            'userId' => $dto->userId,
            'createdAt' => $dto->createdAt->format(DATE_ATOM),
            'expiresAt' => $dto->expiresAt->format(DATE_ATOM),
        ];
        $this->writeSessions($sessions);

        return new Session(
            token: $dto->token,
            userId: $dto->userId,
            createdAt: $dto->createdAt,
            expiresAt: $dto->expiresAt,
        );
    }

    public function findByToken(string $token): ?Session
    {
        $sessions = $this->readSessions();

        foreach ($sessions as $data) {
            if ($data['token'] === $token) {
                return new Session(
                    token: $data['token'],
                    userId: $data['userId'],
                    createdAt: new DateTimeImmutable($data['createdAt']),
                    expiresAt: new DateTimeImmutable($data['expiresAt']),
                );
            }
        }

        return null;
    }

    public function deleteByToken(string $token): void
    {
        $sessions = $this->readSessions();
        $filtered = array_values(array_filter(
            $sessions,
            function (array $data) use ($token) {
                return $data['token'] !== $token;
            }
        ));
        $this->writeSessions($filtered);
    }

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

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

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

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