# All files / src/components/auth TwoFactorModal.tsx

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     'use client';

    import { useState, useEffect, useRef } from 'react';
    import {
      Dialog,
      DialogContent,
      DialogHeader,
      DialogTitle,
      DialogDescription} from '@/components/ui/dialog';
    import { Button } from '@/components/ui/button';
    import { Input } from '@/components/ui/input';
    import { Shield, Key, Loader2, AlertCircle, ArrowLeft } from 'lucide-react';
    import { useTranslation } from 'react-i18next';

    interface TwoFactorModalProps {
      isOpen: boolean;
      onClose: () => void;
      onVerify: (code: string) => Promise<void>;
      error?: string;
      isLoading?: boolean;
    }

    type InputMode = 'totp' | 'backup';

    export function TwoFactorModal({
      isOpen,
      onClose,
      onVerify,
      error,
      isLoading = false}: TwoFactorModalProps) {
      const { t } = useTranslation();
      const [inputMode, setInputMode] = useState<InputMode>('totp');
      const [totpCode, setTotpCode] = useState('');
      const [backupCode, setBackupCode] = useState('');
      const inputRef = useRef<HTMLInputElement>(null);

      // Focus input when modal opens or mode changes
      useEffect(() => {
        if (isOpen) {
          setTimeout(() => inputRef.current?.focus(), 100);
        }
      }, [isOpen, inputMode]);

      // Reset state when modal closes
      useEffect(() => {
        if (!isOpen) {
          setTotpCode('');
          setBackupCode('');
          setInputMode('totp');
        }
      }, [isOpen]);

      const handleSubmit = async (e: React.FormEvent) => {
        e.preventDefault();
        const code = inputMode === 'totp' ? totpCode : backupCode;
        if (code.length > 0) {
          await onVerify(code);
        }
      };

      const handleTotpChange = (value: string) => {
        const cleaned = value.replace(/\D/g, '').slice(0, 6);
        setTotpCode(cleaned);
      };

      const handleBackupChange = (value: string) => {
        const cleaned = value.toUpperCase().replace(/[^A-Z0-9]/g, '').slice(0, 8);
        setBackupCode(cleaned);
      };

      const isValidCode = inputMode === 'totp'
        ? totpCode.length === 6
        : backupCode.length === 8;

      return (
        <Dialog open={isOpen} onOpenChange={(open) => !open && onClose()}>
          <DialogContent
            className="bg-gray-900 border-gray-700 text-white sm:max-w-md"
            showCloseButton={!isLoading}
          >
            <DialogHeader className="text-center sm:text-center">
              <div className="mx-auto mb-4 relative">
                <div className="absolute inset-0 bg-gradient-to-r from-emerald-400 to-cyan-500 rounded-full blur-xl opacity-50 animate-pulse" />
                <div className="relative bg-gray-800 p-4 rounded-full">
                  <Shield className="h-8 w-8 text-emerald-400" />
                </div>
              </div>
              <DialogTitle className="text-2xl font-bold text-white">
                {t('auth.twoFactorModal.title')}
              </DialogTitle>
              <DialogDescription className="text-gray-400">
                {inputMode === 'totp'
                  ? t('auth.twoFactorModal.totpDescription')
                  : t('auth.twoFactorModal.backupDescription')}
              </DialogDescription>
            </DialogHeader>

            <form onSubmit={handleSubmit} className="space-y-6 mt-4">
              {inputMode === 'totp' ? (
                <div className="space-y-2">
                  <label className="block text-sm font-medium text-gray-300">
                    {t('auth.twoFactorModal.authenticationCode')}
                  </label>
                  <div className="relative">
                    <Shield className="absolute left-3 top-1/2 -translate-y-1/2 h-5 w-5 text-gray-400" />
                    <Input
                      ref={inputRef}
                      type="text"
                      inputMode="numeric"
                      value={totpCode}
                      onChange={(e) => handleTotpChange(e.target.value)}
                      className="pl-10 bg-gray-800 border-gray-600 text-white text-center text-2xl font-mono tracking-[0.5em] placeholder:text-gray-500 placeholder:tracking-normal placeholder:text-base focus:border-emerald-400 focus:ring-emerald-400/20"
                      placeholder={t('auth.twoFactorModal.totpPlaceholder')}
                      disabled={isLoading}
                      maxLength={6}
                      autoComplete="one-time-code"
                    />
                  </div>
                </div>
              ) : (
                <div className="space-y-2">
                  <div className="flex items-center gap-2">
                    <button
                      type="button"
                      onClick={() => setInputMode('totp')}
                      className="text-gray-400 hover:text-white transition-colors"
                    >
                      <ArrowLeft className="h-4 w-4" />
                    </button>
                    <label className="block text-sm font-medium text-gray-300">
                      {t('auth.twoFactorModal.backupCode')}
                    </label>
                  </div>
                  <div className="relative">
                    <Key className="absolute left-3 top-1/2 -translate-y-1/2 h-5 w-5 text-gray-400" />
                    <Input
                      ref={inputRef}
                      type="text"
                      value={backupCode}
                      onChange={(e) => handleBackupChange(e.target.value)}
                      className="pl-10 bg-gray-800 border-gray-600 text-white text-center text-xl font-mono tracking-widest placeholder:text-gray-500 placeholder:tracking-normal placeholder:text-base focus:border-amber-400 focus:ring-amber-400/20"
                      placeholder={t('auth.twoFactorModal.backupPlaceholder')}
                      disabled={isLoading}
                      maxLength={8}
                      autoComplete="off"
                    />
                  </div>
                  <p className="text-xs text-gray-500">
                    {t('auth.twoFactorModal.backupHint')}
                  </p>
                </div>
              )}

              {error && (
                <div className="flex items-center gap-2 bg-red-500/10 border border-red-500/30 rounded-lg p-3 text-red-300 text-sm">
                  <AlertCircle className="h-4 w-4 flex-shrink-0" />
                  <span>{error}</span>
                </div>
              )}

              <Button
                type="submit"
                disabled={isLoading || !isValidCode}
                className="w-full bg-gradient-to-r from-emerald-500 to-cyan-500 hover:from-emerald-400 hover:to-cyan-400 text-white font-semibold py-3 transition-all duration-300 disabled:opacity-50"
              >
                {isLoading ? (
                  <span className="flex items-center justify-center gap-2">
                    <Loader2 className="h-5 w-5 animate-spin" />
                    {t('auth.twoFactorModal.verifying')}
                  </span>
                ) : (
                  t('auth.twoFactorModal.verifyAndSignIn')
                )}
              </Button>

              {inputMode === 'totp' && (
                <div className="text-center">
                  <button
                    type="button"
                    onClick={() => setInputMode('backup')}
                    className="text-sm text-gray-400 hover:text-cyan-400 transition-colors inline-flex items-center gap-1"
                  >
                    <Key className="h-3 w-3" />
                    {t('auth.twoFactorModal.useBackupCode')}
                  </button>
                </div>
              )}

              <div className="pt-4 border-t border-gray-700">
                <p className="text-xs text-gray-500 text-center">
                  {t('auth.twoFactorModal.lostAccessHelp')}
                </p>
              </div>
            </form>
          </DialogContent>
        </Dialog>
      );
    }