<?php

namespace MintyPHP\Service\Auth;

use MintyPHP\Session;
use MintyPHP\Repository\Auth\RememberTokenRepository;
use MintyPHP\Repository\User\UserRepository;
use MintyPHP\I18n;
use MintyPHP\Service\Access\PermissionService;
use MintyPHP\Service\Auth\AuthService;

class RememberMeService
{
    private const COOKIE_NAME = 'remember';
    private const LIFETIME_DAYS = 30;

    public static function rememberUser(int $userId): void
    {
        $selector = bin2hex(random_bytes(12));
        $token = bin2hex(random_bytes(32));
        $tokenHash = hash('sha256', $token);
        $expiresAt = gmdate('Y-m-d H:i:s', time() + self::lifetimeSeconds());
        RememberTokenRepository::create($userId, $selector, $tokenHash, $expiresAt);
        self::setCookie($selector, $token);
    }

    public static function autoLoginFromCookie(): bool
    {
        if (!empty($_SESSION['user']['id'])) {
            return false;
        }
        $value = $_COOKIE[self::cookieName()] ?? '';
        if ($value === '' || strpos($value, ':') === false) {
            return false;
        }
        [$selector, $token] = explode(':', $value, 2);
        $selector = trim($selector);
        $token = trim($token);
        if ($selector === '' || $token === '') {
            self::clearCookie();
            return false;
        }

        $record = RememberTokenRepository::findBySelector($selector);
        if (!$record) {
            self::clearCookie();
            return false;
        }

        $expiresAt = (string) ($record['expires_at'] ?? '');
        if ($expiresAt !== '' && strtotime($expiresAt . ' UTC') <= time()) {
            RememberTokenRepository::deleteById((int) $record['id']);
            self::clearCookie();
            return false;
        }

        $hash = (string) ($record['token_hash'] ?? '');
        if ($hash === '' || !hash_equals($hash, hash('sha256', $token))) {
            RememberTokenRepository::deleteById((int) $record['id']);
            self::clearCookie();
            return false;
        }

        $userId = (int) ($record['user_id'] ?? 0);
        if ($userId <= 0) {
            self::clearCookie();
            return false;
        }

        $user = UserRepository::find($userId);
        if (!$user || empty($user['id']) || !($user['active'] ?? 1)) {
            RememberTokenRepository::deleteById((int) $record['id']);
            self::clearCookie();
            return false;
        }

        Session::regenerate();
        $_SESSION['user'] = $user;
        if (!empty($user['locale'])) {
            I18n::$locale = (string) $user['locale'];
        }
        $userId = (int) ($user['id'] ?? 0);
        if ($userId > 0) {
            PermissionService::getUserPermissions($userId, true);
            AuthService::loadTenantDataIntoSession($userId);
            if (empty($_SESSION['no_active_tenant'])) {
                UserRepository::updateLastLogin($userId);
            }
        }

        $newToken = bin2hex(random_bytes(32));
        $newHash = hash('sha256', $newToken);
        $newExpires = gmdate('Y-m-d H:i:s', time() + self::lifetimeSeconds());
        RememberTokenRepository::updateToken((int) $record['id'], $newHash, $newExpires);
        self::setCookie($selector, $newToken);

        return true;
    }

    public static function forgetCurrentUser(): void
    {
        $value = $_COOKIE[self::cookieName()] ?? '';
        if ($value !== '' && strpos($value, ':') !== false) {
            [$selector] = explode(':', $value, 2);
            $selector = trim($selector);
            if ($selector !== '') {
                $record = RememberTokenRepository::findBySelector($selector);
                if ($record && isset($record['id'])) {
                    RememberTokenRepository::deleteById((int) $record['id']);
                }
            }
        }
        self::clearCookie();
    }

    public static function forgetAllForUser(int $userId): void
    {
        RememberTokenRepository::deleteByUserId($userId);
    }

    public static function expireAllTokensByAdmin(): int
    {
        return RememberTokenRepository::expireAllByAdmin();
    }

    private static function setCookie(string $selector, string $token): void
    {
        $value = $selector . ':' . $token;
        $expires = time() + self::lifetimeSeconds();
        $secure = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off')
            || (($_SERVER['HTTP_X_FORWARDED_PROTO'] ?? '') === 'https');

        setcookie(self::cookieName(), $value, [
            'expires' => $expires,
            'path' => '/',
            'secure' => $secure,
            'httponly' => true,
            'samesite' => 'Lax',
        ]);
    }

    private static function clearCookie(): void
    {
        $secure = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off')
            || (($_SERVER['HTTP_X_FORWARDED_PROTO'] ?? '') === 'https');
        setcookie(self::cookieName(), '', [
            'expires' => time() - 3600,
            'path' => '/',
            'secure' => $secure,
            'httponly' => true,
            'samesite' => 'Lax',
        ]);
    }

    private static function lifetimeSeconds(): int
    {
        return self::LIFETIME_DAYS * 24 * 60 * 60;
    }

    private static function cookieName(): string
    {
        $name = getenv('REMEMBER_COOKIE_NAME') ?: self::COOKIE_NAME;
        return trim($name) !== '' ? $name : self::COOKIE_NAME;
    }
}