/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.tuweni.devp2p.v5

import io.vertx.core.Vertx
import io.vertx.core.buffer.Buffer
import io.vertx.kotlin.core.datagram.listenAwait
import kotlinx.coroutines.runBlocking
import org.apache.tuweni.bytes.Bytes
import org.apache.tuweni.concurrent.AsyncResult
import org.apache.tuweni.concurrent.coroutines.await
import org.apache.tuweni.crypto.SECP256K1
import org.apache.tuweni.devp2p.EthereumNodeRecord
import org.apache.tuweni.io.Base64URLSafe
import org.apache.tuweni.junit.BouncyCastleExtension
import org.apache.tuweni.junit.VertxExtension
import org.apache.tuweni.junit.VertxInstance
import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.Timeout
import org.junit.jupiter.api.extension.ExtendWith
import java.net.InetAddress
import java.net.InetSocketAddress
import java.nio.ByteBuffer
import java.time.Instant

@Timeout(10)
@ExtendWith(BouncyCastleExtension::class, VertxExtension::class)
class DefaultDiscoveryV5ServiceTest {

  private val recipientKeyPair: SECP256K1.KeyPair = SECP256K1.KeyPair.random()
  private val recipientEnr: Bytes =
    EthereumNodeRecord.toRLP(recipientKeyPair, ip = InetAddress.getLoopbackAddress(), udp = 19001)
  private val encodedEnr: String = "enr:${Base64URLSafe.encode(recipientEnr)}"
  private val keyPair: SECP256K1.KeyPair = SECP256K1.KeyPair.random()
  private val localPort: Int = 19000
  private val bindAddress: InetSocketAddress = InetSocketAddress("localhost", localPort)
  private val bootstrapENRList: List<String> = listOf(encodedEnr)
  private val enrSeq: Long = Instant.now().toEpochMilli()
  private val selfENR: EthereumNodeRecord = EthereumNodeRecord.create(
    keyPair,
    enrSeq,
    emptyMap(),
    emptyMap(),
    bindAddress.address,
    null,
    bindAddress.port
  )

  @Test
  fun startInitializesConnectorAndBootstraps(@VertxInstance vertx: Vertx) = runBlocking {
    val reference = AsyncResult.incomplete<Buffer>()
    val client = vertx.createDatagramSocket().handler { res ->
      reference.complete(res.data())
    }.listenAwait(19001, "localhost")
    val discoveryV5Service: DiscoveryV5Service =
      DiscoveryService.open(
        vertx,
        keyPair,
        localPort,
        bootstrapENRList = bootstrapENRList
      )
    discoveryV5Service.start()

    val datagram = reference.await()
    val buffer = ByteBuffer.allocate(datagram.length())
    datagram.byteBuf.readBytes(buffer)
    buffer.flip()
    val receivedBytes = Bytes.wrapByteBuffer(buffer)
    val content = receivedBytes.slice(45)

    val message = RandomMessage.create(
      Message.authTag(),
      content
    )
    assertEquals(message.data.size(), Message.RANDOM_DATA_LENGTH)
    discoveryV5Service.terminate()
    client.close()
  }
}
