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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.AuthenticationCallback
import com.microsoft.identity.client.Prompt
import java.util.Collections

/**
 * 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.
 */
class SignInAgainHelper {

    private lateinit var mPCA: ISingleAccountPublicClientApplication

    /**
     * Signs in the user again interactively in single account mode.
     * This will prompt for credentials even if there's an existing session.
     */
    fun signInAgain(activity: Activity, scopes: List<String>, callback: (IAuthenticationResult?, MsalException?) -> Unit) {
        val parameters = SignInParameters.builder()
            .withScopes(scopes)
            .withActivity(activity)
            .withCallback(object : AuthenticationCallback {
                override fun onCancel() {
                    // Handle cancellation
                }
                override fun onSuccess(authenticationResult: IAuthenticationResult) {
                    callback(authenticationResult, null)
                }
                override fun onError(exception: MsalException) {
                    callback(null, exception)
                }
            })
            .build()

        mPCA.signInAgain(parameters)
    }

    /**
     * Example usage for single account mode
     */
    fun exampleSingleAccountUsage(activity: Activity) {
        mPCA = /* Initialize your ISingleAccountPublicClientApplication instance here */
        val graphScopes = Collections.singletonList("User.Read")
        signInAgain(activity, graphScopes) { result, exception ->
            when {
                result != null -> {
                    val accessToken = result.accessToken
                    // Use the access token
                }
                exception != null -> {
                    println("Failed to sign in again: ${exception.message}")
                    // Handle the error
                }
            }
        }
    }
}