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import android.app.Activity;
import com.microsoft.identity.client.ISingleAccountPublicClientApplication;
import com.microsoft.identity.client.SignInParameters;
import com.microsoft.identity.client.IAuthenticationResult;
import com.microsoft.identity.client.exception.MsalException;
import com.microsoft.identity.client.Prompt;
import java.util.Arrays;

/**
 * Demonstrates how to sign in again (reauthenticate existing user) using MSAL's Parameters-based API in SINGLE ACCOUNT MODE.
 *
 * This is useful when you want to force a fresh sign-in, ignoring any existing sessions.
 * Use signInAgain for single account mode. For multiple account mode, use acquireToken with .withPrompt(Prompt.LOGIN) to force authentication.
 */
public class SignInAgainHelper {

    private ISingleAccountPublicClientApplication mPCA;

    /**
     * Signs in the user again interactively in single account mode.
     * This will prompt for credentials even if there's an existing session.
     */
    public void signInAgain(Activity activity, List<String> scopes, final SignInAgainCallback callback) {
        SignInParameters parameters = SignInParameters.builder()
            .withScopes(scopes)
            .withActivity(activity)
            .withCallback(new AuthenticationCallback() {
                @Override
                public void onCancel() {
                    // Handle cancellation
                }
                @Override
                public void onSuccess(IAuthenticationResult authenticationResult) {
                    callback.onComplete(authenticationResult, null);
                }
                @Override
                public void onError(MsalException exception) {
                    callback.onComplete(null, exception);
                }
            })
            .build();

        mPCA.signInAgain(parameters);
    }

    /**
     * Example usage for single account mode
     */
    public void exampleSingleAccountUsage(Activity activity) {
        mPCA = /* Initialize your ISingleAccountPublicClientApplication instance here */;
        List<String> graphScopes = Collections.singletonList("User.Read");
        signInAgain(activity, graphScopes, new SignInAgainCallback() {
            @Override
            public void onComplete(IAuthenticationResult result, MsalException exception) {
                if (result != null) {
                    String accessToken = result.getAccessToken();
                    // Use the access token
                } else if (exception != null) {
                    System.out.println("Failed to sign in again: " + exception.getMessage());
                    // Handle the error
                }
            }
        });
    }

    /**
     * Callback interface for sign in again operations
     */
    public interface SignInAgainCallback {
        void onComplete(IAuthenticationResult result, MsalException exception);
    }
}