// Demonstrating algebraic effects in Lux

// Define a custom logging effect
effect Logger {
    fn log(level: String, msg: String): Unit
    fn getLevel(): String
}

// A function that uses the Logger effect
fn processData(data: Int): Int with {Logger} = {
    Logger.log("info", "Processing data...")
    let result = data * 2
    Logger.log("debug", "Result computed")
    result
}

// A handler that prints logs to console
handler consoleLogger: Logger {
    fn log(level, msg) = Console.print("[" + level + "] " + msg)
    fn getLevel() = "debug"
}

// A handler that ignores logs (for testing)
handler nullLogger: Logger {
    fn log(level, msg) = ()
    fn getLevel() = "none"
}

// Main function showing handler usage
fn main(): Unit with {Console} = {
    let result = run processData(21) with {
        Logger = consoleLogger
    }
    Console.print("Final result: " + result)
}