li/cil/oc/common/tileentity/Computer.scala

package li.cil.oc.common.tileentity

import java.util.concurrent.atomic.AtomicBoolean
import li.cil.oc.api.driver.Slot
import li.cil.oc.client.{PacketSender => ClientPacketSender}
import li.cil.oc.server.component
import li.cil.oc.server.component.Computer.{Environment => ComputerEnvironment}
import li.cil.oc.server.component.Redstone
import li.cil.oc.server.driver
import li.cil.oc.server.driver.Registry
import li.cil.oc.server.{PacketSender => ServerPacketSender}
import net.minecraft.entity.player.EntityPlayer
import net.minecraft.item.ItemStack
import net.minecraft.nbt.NBTTagCompound
import net.minecraftforge.common.ForgeDirection

class Computer(isClient: Boolean) extends Rotatable with ComputerEnvironment with ComponentInventory with Redstone {
  def this() = this(false)

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

  private val hasChanged = new AtomicBoolean(true) // For `markChanged`.

  private var isRunning = false

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

  val instance = if (isClient) null else new component.Computer(this)

  def world = worldObj

  def markAsChanged() = hasChanged.set(true)

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

  def turnOn() = instance.start()

  def turnOff() = instance.stop()

  def isOn = isRunning

  def isOn_=(value: Boolean) = {
    isRunning = value
    worldObj.markBlockForRenderUpdate(xCoord, yCoord, zCoord)
    this
  }

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

  override def readFromNBT(nbt: NBTTagCompound) {
    super.readFromNBT(nbt)
    super.load(nbt)
    instance.recomputeMemory()
  }

  override def writeToNBT(nbt: NBTTagCompound) {
    super.writeToNBT(nbt)
    super.save(nbt)
  }

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

  override def updateEntity() = if (!worldObj.isRemote) {
    instance.update()
    updateRedstoneInput()
    if (hasChanged.get)
      worldObj.markTileEntityChunkModified(xCoord, yCoord, zCoord, this)
    if (isRunning != instance.isRunning)
      ServerPacketSender.sendComputerState(this, instance.isRunning)
    isRunning = instance.isRunning

    for (component <- components) component match {
      case Some(environment) => environment.update()
      case _ => // Empty.
    }
  }

  override def validate() = {
    super.validate()
    if (worldObj.isRemote) {
      ClientPacketSender.sendComputerStateRequest(this)
      ClientPacketSender.sendRedstoneStateRequest(this)
    }
  }

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

  def getInvName = "oc.container.Computer"

  def getSizeInventory = 8

  def isItemValidForSlot(slot: Int, item: ItemStack) = (slot, Registry.driverFor(item)) match {
    case (_, None) => false // Invalid item.
    case (0, Some(driver)) => driver.slot(item) == Slot.Power
    case (1 | 2 | 3, Some(driver)) => driver.slot(item) == Slot.Card
    case (4 | 5, Some(driver)) => driver.slot(item) == Slot.Memory
    case (6 | 7, Some(driver)) => driver.slot(item) == Slot.HardDiskDrive
    case _ => false // Invalid slot.
  }

  override def isUseableByPlayer(player: EntityPlayer) =
    worldObj.getBlockTileEntity(xCoord, yCoord, zCoord) == this &&
      player.getDistanceSq(xCoord + 0.5, yCoord + 0.5, zCoord + 0.5) < 64

  override def onInventoryChanged() {
    super.onInventoryChanged()
    if (!worldObj.isRemote) {
      instance.recomputeMemory()
      isOutputEnabled = hasRedstoneCard
    }
  }

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

  def canConnectRedstone(side: ForgeDirection) = isOutputEnabled

  override def computeInput(side: ForgeDirection) = {
    val global = toGlobal(side)
    worldObj.getIndirectPowerLevelTo(
      xCoord + global.offsetX,
      yCoord + global.offsetY,
      zCoord + global.offsetZ,
      global.ordinal())
  }

  override protected def onRedstoneInputChanged(side: ForgeDirection) {
    super.onRedstoneInputChanged(side)
    instance.signal("redstone_changed", side.ordinal())
  }

  override protected def onRedstoneOutputChanged(side: ForgeDirection) {
    super.onRedstoneOutputChanged(side)
    if (side == ForgeDirection.UNKNOWN) {
      worldObj.notifyBlocksOfNeighborChange(xCoord, yCoord, zCoord,
        getBlockType.blockID)
    }
    else {
      val global = toGlobal(side)
      worldObj.notifyBlockOfNeighborChange(
        xCoord + global.offsetX,
        yCoord + global.offsetY,
        zCoord + global.offsetZ,
        getBlockType.blockID)
    }
    if (!worldObj.isRemote) ServerPacketSender.sendRedstoneState(this)
    else worldObj.markBlockForRenderUpdate(xCoord, yCoord, zCoord)
  }

  private def hasRedstoneCard = inventory.exists {
    case Some(item) => driver.RedstoneCard.worksWith(item)
    case _ => false
  }
}