package wf.servitor.engine.dispatcher

import org.apache.commons.jexl3.JexlContext
import org.apache.commons.jexl3.introspection.JexlMethod
import wf.servitor.engine.exception.UnresolvedRemoteCallException

class NamespaceFaker(
    private val namespace: String,
    private val dispatchedValues: MutableList<Any?>,
    val nextValueIndex: Int = dispatchedValues.size
) : JexlContext {
    override fun has(name: String) = true
    override fun get(name: String): Any {
        return CallExecutor {
            if (dispatchedValues.isNotEmpty()) {
                val first = dispatchedValues.first()
                dispatchedValues.removeAt(0)
                first
            } else {
                throw UnresolvedRemoteCallException(namespace, name, it.toList(), nextValueIndex)
            }
        }
    }

    override fun set(name: String, value: Any?) {
        throw UnsupportedOperationException()
    }

    class CallExecutor(val dispatchedValue: (Array<out Any?>) -> Any?) : JexlMethod {
        override fun tryInvoke(name: String?, obj: Any?, vararg params: Any?): Any {
            TODO("not implemented")
        }

        override fun isCacheable() = false;
        override fun getReturnType(): Class<*> = TODO()
        override fun tryFailed(rval: Any?) = true

        override fun invoke(obj: Any?, vararg params: Any?): Any? {
            return dispatchedValue(params);
        }

    }
}