PsychomatrixBase/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/interactors/ModifyPsychomatrixUseCaseInteractor.kt

package com.github.insanusmokrassar.PsychomatrixBase.domain.interactors

import com.github.insanusmokrassar.PsychomatrixBase.domain.UseCases.ModifyPsychomatrixUseCase
import com.github.insanusmokrassar.PsychomatrixBase.domain.UseCases.PsychomatrixOperationIsConvert
import com.github.insanusmokrassar.PsychomatrixBase.domain.entities.MutablePsychomatrix
import com.github.insanusmokrassar.PsychomatrixBase.domain.entities.Psychomatrix
import com.github.insanusmokrassar.PsychomatrixBase.domain.entities.operations.Operation
import com.github.insanusmokrassar.PsychomatrixBase.utils.extensions.SUBSCRIPTIONS_MEDIUM
import kotlinx.coroutines.experimental.Deferred
import kotlinx.coroutines.experimental.async
import kotlinx.coroutines.experimental.channels.BroadcastChannel
import kotlinx.coroutines.experimental.channels.ReceiveChannel

class ModifyPsychomatrixUseCaseInteractor : ModifyPsychomatrixUseCase {
    private val currentPsychomatrixes: MutableList<MutablePsychomatrix> = ArrayList()

    private val psychomatrixChangedBroadcastChannel = BroadcastChannel<PsychomatrixOperationIsConvert>(SUBSCRIPTIONS_MEDIUM)

    override fun openPsychomatrixChangedSubscription(): ReceiveChannel<PsychomatrixOperationIsConvert> {
        return psychomatrixChangedBroadcastChannel.openSubscription()
    }

    override suspend fun makeConvert(psychomatrix: Psychomatrix, operation: Operation): Deferred<Boolean> {
        return async {
            asMutablePsychomatrix(psychomatrix).applyConvert(operation)
        }
    }

    override suspend fun makeInvert(psychomatrix: Psychomatrix, operation: Operation): Deferred<Boolean> {
        return async {
            asMutablePsychomatrix(psychomatrix).applyInvert(operation)
        }
    }

    override suspend fun getConverts(psychomatrix: Psychomatrix): Deferred<List<Operation>> {
        return asMutablePsychomatrix(psychomatrix).availableConverts
    }

    override suspend fun getInverts(psychomatrix: Psychomatrix): Deferred<List<Operation>> {
        return asMutablePsychomatrix(psychomatrix).availableInverts
    }

    override suspend fun getPsychomatrixHistory(psychomatrix: Psychomatrix): Deferred<List<Operation>> {
        return asMutablePsychomatrix(psychomatrix).operationsHistory
    }

    private fun asMutablePsychomatrix(psychomatrix: Psychomatrix): MutablePsychomatrix {
        return currentPsychomatrixes.firstOrNull {
            it == psychomatrix
        } ?: MutablePsychomatrix(psychomatrix).also {
            currentPsychomatrixes.add(it)
        }
    }
}