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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

/**
 * 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.
 */
class TokenAcquisition {
    private lateinit var mPCA: IMultipleAccountPublicClientApplication

    /**
     * Acquires token interactively, launching browser for user authentication if necessary.
     * This is the recommended method for initial sign-in in multiple account mode.
     */
    fun acquireTokenInteractively(
        activity: Activity,
        scopes: List<String>,
        callback: (IAuthenticationResult?, MsalException?) -> Unit
    ) {
        // Build parameters using the modern Parameters-based API
        val parameters = AcquireTokenParameters.Builder()
            .withScopes(scopes)
            .startAuthorizationFromActivity(activity)
            // .withPrompt(Prompt.LOGIN) // Use Prompt.LOGIN to force interactive re-authentication
            .withCallback(object : AuthenticationCallback {
                override fun onSuccess(authenticationResult: IAuthenticationResult) {
                    callback(authenticationResult, null)
                }

                override fun onError(exception: MsalException) {
                    callback(null, exception)
                }

                override fun onCancel() {
                    // Handle the cancellation
                    println("User cancelled the authentication")
                }
            })
            .build()

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

    /**
     * Example usage with Microsoft Graph scopes
     */
    fun exampleUsage(activity: Activity) {
        mPCA = /* Initialize your IMultipleAccountPublicClientApplication instance here */;
        val graphScopes = listOf("User.Read")
        
        acquireTokenInteractively(activity, graphScopes) { result, exception ->
            when {
                result != null -> {
                    // Use the access token
                    val accessToken = result.accessToken
                    // Make API calls with the token
                }
                exception != null -> {
                    // Handle the exception
                    println("Error acquiring token: ${exception.message}")
                }
            }
        }
    }
}