fast-next-template/frontend/src/components/auth/OAuthButtons.tsx

/**
 * OAuthButtons Component
 * Displays OAuth provider buttons for login/registration
 */

'use client';

import { useTranslations } from 'next-intl';
import { Button } from '@/components/ui/button';
import { useOAuthProviders, useOAuthStart } from '@/lib/api/hooks/useOAuth';
import config from '@/config/app.config';
import { cn } from '@/lib/utils';

// ============================================================================
// Provider Icons
// ============================================================================

function GoogleIcon({ className }: { className?: string }) {
  return (
    <svg className={className} viewBox="0 0 24 24" fill="currentColor">
      <path d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z" />
      <path d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z" />
      <path d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z" />
      <path d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z" />
    </svg>
  );
}

function GitHubIcon({ className }: { className?: string }) {
  return (
    <svg className={className} viewBox="0 0 24 24" fill="currentColor">
      <path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z" />
    </svg>
  );
}

const providerIcons: Record<string, React.ComponentType<{ className?: string }>> = {
  google: GoogleIcon,
  github: GitHubIcon,
};

// ============================================================================
// Component
// ============================================================================

interface OAuthButtonsProps {
  /** Mode for OAuth flow */
  mode: 'login' | 'register';
  /** Show divider with "or" text */
  showDivider?: boolean;
  /** Custom className */
  className?: string;
  /** Called when OAuth flow starts */
  onStart?: (provider: string) => void;
  /** Called on error */
  onError?: (error: Error) => void;
}

/**
 * OAuthButtons - Display OAuth provider buttons
 *
 * Fetches available providers from the backend and displays
 * login/registration buttons for each enabled provider.
 *
 * @example
 * ```tsx
 * <OAuthButtons mode="login" showDivider />
 * ```
 */
export function OAuthButtons({
  mode,
  showDivider = true,
  className,
  onStart,
  onError,
}: OAuthButtonsProps) {
  const t = useTranslations('auth.oauth');
  const { data: providersData, isLoading, error } = useOAuthProviders();
  const oauthStart = useOAuthStart();

  // Don't render if OAuth is not enabled or no providers available
  if (isLoading) {
    return (
      <div className={cn('space-y-4', className)}>
        {showDivider && <Divider />}
        <div className="flex flex-col gap-2">
          <Button variant="outline" disabled className="w-full">
            <span className="h-5 w-5 mr-2 animate-pulse bg-muted rounded" />
            {t('loading')}
          </Button>
        </div>
      </div>
    );
  }

  if (error || !providersData?.enabled || !providersData?.providers?.length) {
    return null;
  }

  const handleOAuthClick = async (provider: string) => {
    try {
      onStart?.(provider);
      await oauthStart.mutateAsync({ provider, mode });
    } catch (err) {
      onError?.(err as Error);
    }
  };

  return (
    <div className={cn('space-y-4', className)}>
      {showDivider && <Divider />}

      <div className="flex flex-col gap-2">
        {providersData.providers.map((provider) => {
          const providerConfig = config.oauth.providers[provider.provider];
          const Icon = providerIcons[provider.provider];

          return (
            <Button
              key={provider.provider}
              variant="outline"
              type="button"
              className="w-full"
              disabled={oauthStart.isPending}
              onClick={() => handleOAuthClick(provider.provider)}
            >
              {Icon && <Icon className="h-5 w-5 mr-2" />}
              {mode === 'login'
                ? t('continueWith', { provider: providerConfig?.name || provider.name })
                : t('signUpWith', { provider: providerConfig?.name || provider.name })}
            </Button>
          );
        })}
      </div>
    </div>
  );
}

// ============================================================================
// Divider Component
// ============================================================================

function Divider() {
  const t = useTranslations('auth.oauth');

  return (
    <div className="relative">
      <div className="absolute inset-0 flex items-center">
        <span className="w-full border-t" />
      </div>
      <div className="relative flex justify-center text-xs uppercase">
        <span className="bg-background px-2 text-muted-foreground">{t('divider')}</span>
      </div>
    </div>
  );
}

export default OAuthButtons;