src/main/scala/li/cil/oc/integration/tis3d/SerialInterfaceProviderAdapter.scala

package li.cil.oc.integration.tis3d

import li.cil.oc.Settings
import li.cil.oc.api
import li.cil.oc.api.internal.Adapter
import li.cil.oc.api.machine.Arguments
import li.cil.oc.api.machine.Callback
import li.cil.oc.api.machine.Context
import li.cil.oc.api.network.Environment
import li.cil.oc.api.network.Message
import li.cil.oc.api.network.Node
import li.cil.oc.api.network.Visibility
import li.cil.oc.util.ResultWrapper.result
import li.cil.tis3d.api.ManualAPI
import li.cil.tis3d.api.SerialAPI
import li.cil.tis3d.api.prefab.manual.ResourceContentProvider
import li.cil.tis3d.api.serial.SerialInterface
import li.cil.tis3d.api.serial.SerialInterfaceProvider
import li.cil.tis3d.api.serial.SerialProtocolDocumentationReference
import net.minecraft.nbt.NBTTagCompound
import net.minecraft.util.EnumFacing
import net.minecraft.world.World

import scala.collection.mutable

object SerialInterfaceProviderAdapter extends SerialInterfaceProvider {
  def init(): Unit = {
    ManualAPI.addProvider(new ResourceContentProvider(Settings.resourceDomain, "doc/tis3d/"))
    SerialAPI.addProvider(this)
  }

  override def getDocumentationReference = new SerialProtocolDocumentationReference("OpenComputers Adapter", "protocols/opencomputersAdapter.md")

  override def worksWith(world: World, x: Int, y: Int, z: Int, side: EnumFacing): Boolean = world.getTileEntity(x, y, z).isInstanceOf[Adapter]

  override def interfaceFor(world: World, x: Int, y: Int, z: Int, side: EnumFacing): SerialInterface = new SerialInterfaceAdapter(world.getTileEntity(x, y, z).asInstanceOf[Adapter])

  override def isValid(world: World, x: Int, y: Int, z: Int, side: EnumFacing, serialInterface: SerialInterface): Boolean = serialInterface match {
    case adapter: SerialInterfaceAdapter => adapter.tileEntity == world.getTileEntity(x, y, z)
    case _ => false
  }

  class SerialInterfaceAdapter(val tileEntity: Adapter) extends Environment with SerialInterface {
    final val BufferCapacity = 128
    final val readBuffer = mutable.Queue.empty[Short]
    final val writeBuffer = mutable.Queue.empty[Short]
    var isReading = false

    // ----------------------------------------------------------------------- //

    val node = api.Network.newNode(this, Visibility.Network).withComponent("serial_port").create()

    override def onMessage(message: Message): Unit = {}

    override def onConnect(node: Node): Unit = {}

    override def onDisconnect(node: Node): Unit = {}

    // ----------------------------------------------------------------------- //

    @Callback
    def setReading(context: Context, args: Arguments): Array[AnyRef] = {
      isReading = args.checkBoolean(0)
      null
    }

    @Callback
    def read(context: Context, args: Arguments): Array[AnyRef] = {
      readBuffer.synchronized(if (readBuffer.nonEmpty) {
        result(readBuffer.dequeue())
      } else {
        null
      })
    }

    @Callback
    def write(context: Context, args: Arguments): Array[AnyRef] = {
      writeBuffer.synchronized(if (writeBuffer.length < BufferCapacity) {
        writeBuffer += args.checkInteger(0).toShort
        result(true)
      } else {
        result(false, "buffer full")
      })
    }

    // ----------------------------------------------------------------------- //

    override def canWrite: Boolean = readBuffer.synchronized(isReading && readBuffer.length < BufferCapacity)

    override def write(value: Short): Unit = readBuffer.synchronized(readBuffer += value)

    override def canRead: Boolean = {
      ensureConnected()
      writeBuffer.synchronized(writeBuffer.nonEmpty)
    }

    override def peek(): Short = writeBuffer.synchronized(writeBuffer.front)

    override def skip(): Unit = writeBuffer.synchronized(writeBuffer.dequeue())

    override def reset(): Unit = {
      readBuffer.synchronized(writeBuffer.synchronized {
        readBuffer.clear()
        writeBuffer.clear()
        node.remove()
      })
    }

    override def readFromNBT(nbt: NBTTagCompound): Unit = {
      writeBuffer.clear()
      writeBuffer ++= nbt.getIntArray("writeBuffer").map(_.toShort)
      readBuffer.clear()
      readBuffer ++= nbt.getIntArray("readBuffer").map(_.toShort)
      isReading = nbt.getBoolean("isReading")
    }

    override def writeToNBT(nbt: NBTTagCompound): Unit = {
      nbt.setIntArray("writeBuffer", writeBuffer.toArray.map(_.toInt))
      nbt.setIntArray("readBuffer", readBuffer.toArray.map(_.toInt))
      nbt.setBoolean("isReading", isReading)
    }

    private def ensureConnected(): Unit = {
      if (tileEntity.node.network != node.network) {
        tileEntity.node.connect(node)
      }
    }
  }

}