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package ru.casperix.signals.concrete

import ru.casperix.misc.*
import ru.casperix.signals.api.CustomFuture

class EitherCollectionFuture(loaders: List>) :
    EitherFuture, List> {

    constructor(vararg loaders: EitherFuture) : this(loaders.toList())

    private val resultMap: MutableList?> = loaders.map {
        null
    }.toMutableList()

    private val outputSignal = EitherSignal, List>()

    override val acceptFuture: CustomFuture<(List) -> Unit, Slot> = outputSignal.acceptFuture
    override val rejectFuture: CustomFuture<(List) -> Unit, Slot> = outputSignal.rejectFuture
    override val complete: Boolean get() = outputSignal.complete

    init {
        loaders.forEachIndexed { index, future ->
            future.thenAccept {
                resultMap[index] = Left(it)
                outputIfCompleted()
            }
            future.thenReject {
                resultMap[index] = Right(it)
                outputIfCompleted()
            }
        }
    }

    private fun outputIfCompleted() {
        val listA: List = resultMap.mapNotNull {
            if (it == null) return
            it.left()
        }
        val listB: List = resultMap.mapNotNull {
            if (it == null) return
            it.right()
        }

        if (listB.isNotEmpty()) {
            outputSignal.reject(listB)
        } else {
            if (listA.size != resultMap.size) {
                throw Exception("Invalid accept result")
            }
            outputSignal.accept(listA)
        }
    }
}