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import android.app.Activity;
import com.microsoft.identity.client.AcquireTokenParameters;
import com.microsoft.identity.client.AuthenticationCallback;
import com.microsoft.identity.client.IAuthenticationResult;
import com.microsoft.identity.client.IMultipleAccountPublicClientApplication;
import com.microsoft.identity.client.exception.MsalException;
import java.util.Arrays;
import java.util.List;

/**
 * Snippet showing how to acquire a token interactively.
 * 
 * This method can be used for initial sign-in in multiple account mode. It can be used to re-authenticate a user in either
 * single account mode or multiple account mode. In single account mode, to sign in a user for the first time, use signIn.
 */
public class TokenAcquisition {
    private IMultipleAccountPublicClientApplication mPCA;

    /**
     * Acquires token interactively, launching browser for user authentication if necessary.
     * This is the recommended method for initial sign-in in multiple account mode.
     */
    public void acquireTokenInteractively(
            Activity activity,
            List<String> scopes,
            final TokenCallback callback) {
        // Build parameters using the modern Parameters-based API
        AcquireTokenParameters parameters = new AcquireTokenParameters.Builder()
            .withScopes(scopes)
            .startAuthorizationFromActivity(activity)
            // .withPrompt(Prompt.LOGIN) // Use Prompt.LOGIN to force interactive re-authentication
            .withCallback(new AuthenticationCallback() {
                @Override
                public void onSuccess(IAuthenticationResult authenticationResult) { // Token acquisition successful, handle result
                    callback.onComplete(authenticationResult, null);
                }

                @Override
                public void onError(MsalException exception) { // Token acquisition failed, handle error
                    callback.onComplete(null, exception);
                }

                @Override
                public void onCancel() { // User cancelled the authentication, handle cancellation
                    // Handle the cancellation
                    System.out.println("User cancelled the authentication");
                }
            })
            .build();

        // Acquire token using the parameters
        mPCA.acquireToken(parameters);
    }

    /**
     * Example usage with Microsoft Graph scopes
     */
    public void exampleUsage(Activity activity) {
        mPCA = /* Initialize your IMultipleAccountPublicClientApplication instance here */;
        List<String> graphScopes = Collections.singletonList("User.Read");
        
        acquireTokenInteractively(activity, graphScopes, new TokenCallback() {
            @Override
            public void onComplete(IAuthenticationResult result, MsalException exception) {
                if (result != null) {
                    // Use the access token
                    String accessToken = result.getAccessToken();
                    // Make API calls with the token
                } else if (exception != null) {
                    // Handle the exception
                    System.out.println("Error acquiring token: " + exception.getMessage());
                }
            }
        });
    }

    /**
     * Callback interface for token operations
     */
    public interface TokenCallback {
        void onComplete(IAuthenticationResult result, MsalException exception);
    }
}