import kotlin.reflect.KClass

// TODO: make the default type of U to Any, 
// and the default prepare to {} (lambda returning unit)

// I should be able to remove the prepare arg in main

class Rule<T : Any, U : Any>(
    val clazz: KClass<T>,
    val name: String,
    private val prepare: T.() -> U = { Unit as U},
    private val whenTrue: T.(U) -> Boolean = { true },
    private val thenDo: T.(U) -> Unit = {},
) {
    fun fire(arg: T): Boolean {
        if (!clazz.isInstance(arg)) return false
        val prepareResult = arg.prepare()
        if (arg.whenTrue(prepareResult)) {
            arg.thenDo(prepareResult)
            return true
        }
        return false
    }
}
fun main() {
  val rule=Rule(String::class, "accepts all string", prepare={})
}