SDK Core & Authentication

object FacebookSdk {
    fun sdkInitialize(applicationContext: Context)
    fun sdkInitialize(applicationContext: Context, callback: InitializeCallback?)
    fun isInitialized(): Boolean
    fun fullyInitialize()
    fun isFullyInitialized(): Boolean
}

interface InitializeCallback {
    fun onInitialized()
}

class MyApplication : Application() {
    override fun onCreate() {
        super.onCreate()
        FacebookSdk.sdkInitialize(applicationContext) {
            // SDK initialization complete
            Log.d("Facebook", "SDK initialized")
        }
    }
}

object FacebookSdk {
    // Application configuration
    fun getApplicationId(): String
    fun setApplicationId(applicationId: String)
    fun getApplicationName(): String?
    fun setApplicationName(applicationName: String?)
    fun getClientToken(): String
    fun setClientToken(clientToken: String?)
    
    // Version information
    fun getSdkVersion(): String
    fun getGraphApiVersion(): String
    fun setGraphApiVersion(graphApiVersion: String)
    
    // Context and execution
    fun getApplicationContext(): Context
    fun getExecutor(): Executor
    fun setExecutor(executor: Executor)
    
    // Debugging and logging
    fun isDebugEnabled(): Boolean
    fun setIsDebugEnabled(enabled: Boolean)
    fun getLoggingBehaviors(): Set<LoggingBehavior>
    fun addLoggingBehavior(behavior: LoggingBehavior)
    fun removeLoggingBehavior(behavior: LoggingBehavior)
    fun clearLoggingBehaviors()
    fun isLoggingBehaviorEnabled(behavior: LoggingBehavior): Boolean
}

enum class LoggingBehavior {
    REQUESTS,
    INCLUDE_ACCESS_TOKENS,
    INCLUDE_RAW_RESPONSES,
    CACHE,
    APP_EVENTS,
    DEVELOPER_ERRORS,
    GRAPH_API_DEBUG_WARNING,
    GRAPH_API_DEBUG_INFO
}

class AccessToken(
    accessToken: String,
    applicationId: String,
    userId: String,
    permissions: Collection<String?>?,
    declinedPermissions: Collection<String?>?,
    expiredPermissions: Collection<String?>?,
    accessTokenSource: AccessTokenSource?,
    expirationTime: Date?,
    lastRefreshTime: Date?,
    dataAccessExpirationTime: Date?,
    graphDomain: String? = "facebook"
) {
    val token: String
    val applicationId: String
    val userId: String
    val permissions: Set<String?>
    val declinedPermissions: Set<String?>
    val expiredPermissions: Set<String?>
    val expires: Date
    val lastRefresh: Date
    val dataAccessExpirationTime: Date
    val source: AccessTokenSource
    val graphDomain: String?
    
    // Token status
    val isExpired: Boolean
    val isDataAccessExpired: Boolean
    val isInstagramToken: Boolean
    
    companion object {
        // Current token management
        fun getCurrentAccessToken(): AccessToken?
        fun setCurrentAccessToken(accessToken: AccessToken?)
        fun isCurrentAccessTokenActive(): Boolean
        fun isDataAccessActive(): Boolean
        fun isLoggedInWithInstagram(): Boolean
        fun expireCurrentAccessToken()
        
        // Token refresh
        fun refreshCurrentAccessTokenAsync()
        fun refreshCurrentAccessTokenAsync(callback: AccessTokenRefreshCallback?)
        
        // Token creation
        fun createFromNativeLinkingIntent(
            intent: Intent,
            applicationId: String,
            accessTokenCallback: AccessTokenCreationCallback
        )
    }
}

enum class AccessTokenSource {
    FACEBOOK_APPLICATION_WEB,
    FACEBOOK_APPLICATION_NATIVE,
    FACEBOOK_APPLICATION_SERVICE,
    WEB_VIEW,
    CHROME_CUSTOM_TAB,
    INSTAGRAM_APPLICATION_WEB,
    INSTAGRAM_CUSTOM_CHROME_TAB,
    INSTAGRAM_WEB_VIEW
}

interface AccessTokenRefreshCallback {
    fun OnTokenRefreshed(accessToken: AccessToken?)
    fun OnTokenRefreshFailed(exception: FacebookException?)
}

interface AccessTokenCreationCallback {
    fun onSuccess(token: AccessToken?)
    fun onError(error: FacebookException?)
}

// Check if user is logged in
if (AccessToken.isCurrentAccessTokenActive()) {
    val currentToken = AccessToken.getCurrentAccessToken()
    val userId = currentToken?.userId
    val permissions = currentToken?.permissions
    
    // Use the token for API calls
    makeGraphRequest(currentToken)
} else {
    // User needs to log in
    initiateLogin()
}

// Refresh current token
AccessToken.refreshCurrentAccessTokenAsync { accessToken ->
    if (accessToken != null) {
        // Token refreshed successfully
        Log.d("Facebook", "Token refreshed for user: ${accessToken.userId}")
    } else {
        // Token refresh failed
        Log.e("Facebook", "Failed to refresh token")
    }
}

class Profile(
    id: String?,
    firstName: String?,
    middleName: String?,
    lastName: String?,
    name: String?,
    linkUri: Uri?,
    pictureUri: Uri?
) {
    val id: String?
    val firstName: String?
    val middleName: String?
    val lastName: String?
    val name: String?
    val linkUri: Uri?
    val pictureUri: Uri?
    
    companion object {
        fun getCurrentProfile(): Profile?
        fun setCurrentProfile(profile: Profile?)
        fun fetchProfileForCurrentAccessToken()
    }
}

abstract class ProfileTracker {
    val isTracking: Boolean
    
    fun startTracking()
    fun stopTracking()
    
    protected abstract fun onCurrentProfileChanged(
        oldProfile: Profile?,
        currentProfile: Profile?
    )
}

class AuthenticationToken(
    token: String,
    nonce: String,
    graphDomain: String
) {
    val token: String
    val nonce: String
    val graphDomain: String
    val header: AuthenticationTokenHeader
    val claims: AuthenticationTokenClaims
    
    companion object {
        fun getCurrentAuthenticationToken(): AuthenticationToken?
        fun setCurrentAuthenticationToken(token: AuthenticationToken?)
    }
}

class AuthenticationTokenClaims(
    encodedClaims: String,
    expectedNonce: String
) {
    val jti: String?
    val iss: String?
    val aud: String?
    val nonce: String?
    val exp: Long
    val iat: Long
    val sub: String?
    val name: String?
    val givenName: String?
    val middleName: String?
    val familyName: String?
    val email: String?
    val picture: String?
    val userFriends: List<String>?
    val userBirthday: String?
    val userAgeRange: Map<String, Int>?
    val userHometown: Map<String, String>?
    val userLocation: Map<String, String>?
    val userGender: String?
    val userLink: String?
}

class AuthenticationTokenHeader(encodedHeader: String) {
    val alg: String?
    val typ: String?
    val kid: String?
}

open class FacebookException(message: String?) : RuntimeException(message)

class FacebookSdkNotInitializedException(message: String?) : FacebookException(message)

class FacebookAuthorizationException(message: String?) : FacebookException(message)

class FacebookOperationCanceledException(message: String?) : FacebookException(message)

class FacebookServiceException(
    error: FacebookRequestError,
    errorMessage: String?
) : FacebookException(errorMessage)

class FacebookGraphResponseException(
    response: GraphResponse,
    message: String?
) : FacebookException(message) {
    val graphResponse: GraphResponse
}

class FacebookRequestError(
    requestStatusCode: Int,
    errorCode: Int,
    errorType: String?,
    errorMessage: String?
) {
    val requestStatusCode: Int
    val errorCode: Int
    val errorType: String?
    val errorMessage: String?
    val errorUserMessage: String?
    val errorUserTitle: String?
    val requestResult: JSONObject?
    
    enum class Category {
        LOGIN_RECOVERABLE,
        OTHER,
        TRANSIENT
    }
    
    val category: Category
}

interface CallbackManager {
    fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?): Boolean
    
    object Factory {
        fun create(): CallbackManager
    }
}

interface FacebookCallback<T> {
    fun onSuccess(result: T)
    fun onCancel()
    fun onError(error: FacebookException)
}

class MainActivity : AppCompatActivity() {
    private lateinit var callbackManager: CallbackManager
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        callbackManager = CallbackManager.Factory.create()
        
        // Register callbacks for various Facebook operations
        LoginManager.getInstance().registerCallback(callbackManager, loginCallback)
        ShareDialog(this).registerCallback(callbackManager, shareCallback)
    }
    
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        // This delegates to all registered Facebook callbacks
        callbackManager.onActivityResult(requestCode, resultCode, data)
        super.onActivityResult(requestCode, resultCode, data)
    }
}

object UserSettingsManager {
    fun getAutoInitEnabled(): Boolean
    fun setAutoInitEnabled(enabled: Boolean)
    fun getAutoLogAppEventsEnabled(): Boolean
    fun setAutoLogAppEventsEnabled(enabled: Boolean)
    fun getAdvertiserIDCollectionEnabled(): Boolean
    fun setAdvertiserIDCollectionEnabled(enabled: Boolean)
    fun getCodelessSetupEnabled(): Boolean
    fun getMonitorEnabled(): Boolean
    fun setMonitorEnabled(enabled: Boolean)
}