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/*
 * Copyright 2021 - 2023 Sporta Technologies PVT LTD & the ZIO HTTP contributors.
 *
 * 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.
 */

package zio.http.netty

import zio._
import zio.stacktracer.TracingImplicits.disableAutoTrace

import io.netty.channel.{Channel => JChannel, ChannelFuture => JChannelFuture}

private[netty] final case class NettyChannel[-A](
  private val channel: JChannel,
  private val convert: A => Any,
) {
  self =>

  private def run(await: Boolean)(run: JChannel => JChannelFuture)(implicit trace: Trace): Task[Unit] = {
    if (await) {
      NettyFutureExecutor.executed(run(channel))
    } else {
      ZIO.attempt(run(channel): Unit)
    }
  }

  def autoRead(flag: Boolean)(implicit trace: Trace): UIO[Unit] =
    ZIO.succeed(channel.config.setAutoRead(flag): Unit)

  def awaitClose(implicit trace: Trace): UIO[Unit] = ZIO.async[Any, Nothing, Unit] { register =>
    channel.closeFuture().addListener((_: JChannelFuture) => register(ZIO.unit))
    ()
  }

  def close(await: Boolean = false)(implicit trace: Trace): Task[Unit] =
    run(await) { _.close() }

  def contramap[A1](f: A1 => A): NettyChannel[A1] = copy(convert = convert.compose(f))

  def flush(implicit trace: Trace): Task[Unit] = ZIO.attempt(channel.flush(): Unit)

  def id(implicit trace: Trace): String = channel.id().asLongText()

  def isAutoRead(implicit trace: Trace): UIO[Boolean] = ZIO.succeed(channel.config.isAutoRead)

  def read(implicit trace: Trace): UIO[Unit] = ZIO.succeed(channel.read(): Unit)

  def write(msg: A, await: Boolean = false)(implicit trace: Trace): Task[Unit] =
    run(await) {
      _.write(convert(msg))
    }

  def writeAndFlush(msg: => A, await: Boolean = true)(implicit trace: Trace): Task[Unit] =
    run(await) { ch =>
      ch.writeAndFlush(convert(msg))
    }
}

private[netty] object NettyChannel {
  def make[A](channel: JChannel): NettyChannel[A] = NettyChannel(channel, identity)
}