import { useState, type FormEvent } from 'react';
import type { MfaChallengeProps } from './types.js';

/**
 * MFA code entry form (6-digit TOTP or recovery code).
 * Styled via CSS custom properties (inherits --bl-* from host app).
 */
export function MfaChallenge({
  onSubmit,
  onUseRecovery,
  methods,
  isLoading = false,
  error,
  className,
}: MfaChallengeProps) {
  const [code, setCode] = useState('');

  function handleSubmit(e: FormEvent) {
    e.preventDefault();
    onSubmit(code);
  }

  return (
    <div className={className} data-testid="bl-mfa-challenge">
      <form
        onSubmit={handleSubmit}
        style={{ display: 'flex', flexDirection: 'column', gap: '12px' }}
      >
        <div style={{ fontSize: '14px', color: 'var(--bl-text, #333)' }}>
          Enter your authentication code
        </div>

        {methods && methods.length > 0 && (
          <div
            data-testid="bl-mfa-methods"
            style={{ fontSize: '12px', color: 'var(--bl-muted, #999)' }}
          >
            Available methods: {methods.join(', ')}
          </div>
        )}

        <input
          type="text"
          inputMode="numeric"
          autoComplete="one-time-code"
          placeholder="000000"
          value={code}
          onChange={e => setCode(e.target.value)}
          required
          disabled={isLoading}
          maxLength={8}
          data-testid="bl-mfa-code"
          style={{
            padding: '12px',
            border: '1px solid var(--bl-border, #ccc)',
            borderRadius: 'var(--bl-radius, 6px)',
            fontSize: '24px',
            textAlign: 'center',
            letterSpacing: '4px',
            fontFamily: 'monospace',
          }}
        />

        {error && (
          <div
            data-testid="bl-mfa-error"
            style={{ color: 'var(--bl-error, #dc3545)', fontSize: '13px' }}
          >
            {error}
          </div>
        )}

        <button
          type="submit"
          disabled={isLoading || code.length < 6}
          data-testid="bl-mfa-submit"
          style={{
            padding: '10px 16px',
            border: 'none',
            borderRadius: 'var(--bl-radius, 6px)',
            background: 'var(--bl-primary, #0066ff)',
            color: '#fff',
            cursor: isLoading ? 'not-allowed' : 'pointer',
            fontSize: '14px',
            fontWeight: 600,
            opacity: isLoading || code.length < 6 ? 0.6 : 1,
          }}
        >
          {isLoading ? 'Verifying...' : 'Verify'}
        </button>

        {onUseRecovery && (
          <button
            type="button"
            onClick={onUseRecovery}
            disabled={isLoading}
            data-testid="bl-mfa-recovery"
            style={{
              padding: '8px',
              border: 'none',
              background: 'transparent',
              color: 'var(--bl-link, #0066ff)',
              cursor: 'pointer',
              fontSize: '13px',
              textDecoration: 'underline',
            }}
          >
            Use a recovery code
          </button>
        )}
      </form>
    </div>
  );
}