/*
 * ============LICENSE_START=======================================================
 * dcaegen2-collectors-veshv
 * ================================================================================
 * Copyright (C) 2018-2019 NOKIA
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */
package org.onap.dcae.collectors.veshv.tests.component

import io.netty.buffer.ByteBuf
import io.netty.buffer.ByteBufAllocator
import io.netty.buffer.UnpooledByteBufAllocator
import org.onap.dcae.collectors.veshv.boundary.Collector
import org.onap.dcae.collectors.veshv.boundary.Sink
import org.onap.dcae.collectors.veshv.boundary.SinkFactory
import org.onap.dcae.collectors.veshv.config.api.model.CollectorConfiguration
import org.onap.dcae.collectors.veshv.config.api.model.Routing
import org.onap.dcae.collectors.veshv.domain.RoutedMessage
import org.onap.dcae.collectors.veshv.factory.HvVesCollectorFactory
import org.onap.dcae.collectors.veshv.domain.logging.ClientContext
import org.onap.dcae.collectors.veshv.tests.fakes.AlwaysFailingSink
import org.onap.dcae.collectors.veshv.tests.fakes.AlwaysSuccessfulSink
import org.onap.dcae.collectors.veshv.tests.fakes.DelayingSink
import org.onap.dcae.collectors.veshv.tests.fakes.FakeMetrics
import org.onap.dcae.collectors.veshv.tests.fakes.MAX_PAYLOAD_SIZE_BYTES
import org.onap.dcae.collectors.veshv.tests.fakes.StoringSink
import org.onap.dcae.collectors.veshv.tests.fakes.basicRouting
import org.onap.dcae.collectors.veshv.utils.Closeable
import org.onap.dcaegen2.services.sdk.model.streams.SinkStream
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
import java.time.Duration
import java.util.concurrent.atomic.AtomicBoolean

/**
 * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
 * @since May 2018
 */
class Sut(configuration: CollectorConfiguration, sink: Sink = StoringSink()) : Closeable {
    val alloc: ByteBufAllocator = UnpooledByteBufAllocator.DEFAULT
    val metrics = FakeMetrics()
    val sinkProvider = DummySinkFactory(sink)

    private val collectorProvider = HvVesCollectorFactory(
            configuration,
            sinkProvider,
            metrics
    )

    val collector: Collector
        get() = collectorProvider(ClientContext(alloc))


    fun handleConnection(sink: StoringSink, vararg packets: ByteBuf): List<RoutedMessage> {
        collector.handleConnection(Flux.fromArray(packets)).block(TIMEOUT)
        return sink.sentMessages
    }

    fun handleConnection(vararg packets: ByteBuf) {
        collector.handleConnection(Flux.fromArray(packets)).block(TIMEOUT)
    }

    override fun close() = collectorProvider.close()

    companion object {
        private val TIMEOUT = Duration.ofSeconds(10)
    }
}

class DummySinkFactory(private val sink: Sink) : SinkFactory {
    private val sinkInitialized = AtomicBoolean(false)

    override fun invoke(stream: SinkStream, ctx: ClientContext) = lazy {
        sinkInitialized.set(true)
        sink
    }

    override fun close() =
            if (sinkInitialized.get()) {
                sink.close()
            } else {
                Mono.empty()
            }
}

fun vesHvWithAlwaysSuccessfulSink(routing: Routing = basicRouting): Sut =
        Sut(CollectorConfiguration(routing, MAX_PAYLOAD_SIZE_BYTES), AlwaysSuccessfulSink())

fun vesHvWithAlwaysFailingSink(routing: Routing = basicRouting): Sut =
        Sut(CollectorConfiguration(routing, MAX_PAYLOAD_SIZE_BYTES), AlwaysFailingSink())

fun vesHvWithDelayingSink(delay: Duration, routing: Routing = basicRouting): Sut =
        Sut(CollectorConfiguration(routing, MAX_PAYLOAD_SIZE_BYTES), DelayingSink(delay))