session-android/libsession/src/main/java/org/session/libsession/messaging/jobs/MessageReceiveJob.kt

package org.session.libsession.messaging.jobs

import nl.komponents.kovenant.Promise
import nl.komponents.kovenant.deferred
import org.session.libsession.messaging.sending_receiving.MessageReceiver
import org.session.libsession.messaging.sending_receiving.handle
import org.session.libsession.messaging.utilities.Data
import org.session.libsignal.utilities.Log

class MessageReceiveJob(val data: ByteArray, val serverHash: String? = null, val openGroupMessageServerID: Long? = null, val openGroupID: String? = null) : Job {
    override var delegate: JobDelegate? = null
    override var id: String? = null
    override var failureCount: Int = 0

    override val maxFailureCount: Int = 10
    companion object {
        val TAG = MessageReceiveJob::class.simpleName
        val KEY: String = "MessageReceiveJob"

        // Keys used for database storage
        private val DATA_KEY = "data"
        private val SERVER_HASH_KEY = "serverHash"
        private val OPEN_GROUP_MESSAGE_SERVER_ID_KEY = "openGroupMessageServerID"
        private val OPEN_GROUP_ID_KEY = "open_group_id"
    }

    override fun execute() {
        executeAsync().get()
    }

    fun executeAsync(): Promise<Unit, Exception> {
        val deferred = deferred<Unit, Exception>()
        try {
            val isRetry: Boolean = failureCount != 0
            val (message, proto) = MessageReceiver.parse(this.data, this.openGroupMessageServerID)
            message.serverHash = serverHash
            MessageReceiver.handle(message, proto, this.openGroupID)
            this.handleSuccess()
            deferred.resolve(Unit)
        } catch (e: Exception) {
            Log.e(TAG, "Couldn't receive message.", e)
            if (e is MessageReceiver.Error && !e.isRetryable) {
                Log.e("Loki", "Message receive job permanently failed.", e)
                this.handlePermanentFailure(e)
            } else {
                Log.e("Loki", "Couldn't receive message.", e)
                this.handleFailure(e)
            }
            deferred.resolve(Unit) // The promise is just used to keep track of when we're done
        }
        return deferred.promise
    }

    private fun handleSuccess() {
        delegate?.handleJobSucceeded(this)
    }

    private fun handlePermanentFailure(e: Exception) {
        delegate?.handleJobFailedPermanently(this, e)
    }

    private fun handleFailure(e: Exception) {
        delegate?.handleJobFailed(this, e)
    }

    override fun serialize(): Data {
        val builder = Data.Builder().putByteArray(DATA_KEY, data)
        serverHash?.let { builder.putString(SERVER_HASH_KEY, it) }
        openGroupMessageServerID?.let { builder.putLong(OPEN_GROUP_MESSAGE_SERVER_ID_KEY, it) }
        openGroupID?.let { builder.putString(OPEN_GROUP_ID_KEY, it) }
        return builder.build();
    }

    override fun getFactoryKey(): String {
        return KEY
    }

    class Factory: Job.Factory<MessageReceiveJob> {

        override fun create(data: Data): MessageReceiveJob {
            val dataArray = data.getByteArray(DATA_KEY)
            val serverHash = data.getStringOrDefault(SERVER_HASH_KEY, null)
            val openGroupMessageServerID = data.getLongOrDefault(OPEN_GROUP_MESSAGE_SERVER_ID_KEY, -1).let { if (it == -1L) null else it }
            val openGroupID = data.getStringOrDefault(OPEN_GROUP_ID_KEY, null)
            return MessageReceiveJob(
                dataArray,
                serverHash,
                openGroupMessageServerID,
                openGroupID
            )
        }
    }
}