Authenticate

class AuthManager {
    var callbackVar: (() -> Bool)?

    func authenticateUser(username: String, password: String, isAuth: @escaping () -> Bool) {
        let validCredentials = [
            "user1": "password1",
            "user2": "password2",
            "user3": "password3"
        ]

        let authenticated = validCredentials[username] == password

        callbackVar = isAuth



        if callbackVar != nil {
            let success = callbackVar!()
            if success {
                print("Authentication successful")
            } else {
                print("Authentication failed")
            }
        }
    }
}

let authManager = AuthManager()

let callback: () -> Bool = {
    return true
}

authManager.authenticateUser(username: "user1", password: "password1", isAuth: callback)