src/main/scala/li/cil/oc/util/ExtendedArguments.scala

package li.cil.oc.util

import li.cil.oc.api.machine.Robot
import li.cil.oc.api.network.Arguments
import net.minecraft.inventory.IInventory
import net.minecraftforge.common.util.ForgeDirection

import scala.language.implicitConversions

object ExtendedArguments {

  implicit def extendedArguments(args: Arguments) = new ExtendedArguments(args)

  class ExtendedArguments(val args: Arguments) {
    def optionalItemCount(n: Int) =
      if (args.count > n && args.checkAny(n) != null) {
        math.max(0, math.min(64, args.checkInteger(n)))
      }
      else 64

    def checkSlot(inventory: IInventory, n: Int) = {
      val slot = args.checkInteger(n) - 1
      if (slot < 0 || slot >= inventory.getSizeInventory) {
        throw new IllegalArgumentException("invalid slot")
      }
      slot
    }

    def checkSlot(robot: Robot, n: Int) = {
      val slot = args.checkInteger(n) - 1
      if (slot < 0 || slot >= robot.inventorySize) {
        throw new IllegalArgumentException("invalid slot")
      }
      slot + 1 + robot.containerCount
    }

    def checkSideForAction(n: Int) = checkSide(n, ForgeDirection.SOUTH, ForgeDirection.UP, ForgeDirection.DOWN)

    def checkSideForMovement(n: Int) = checkSide(n, ForgeDirection.SOUTH, ForgeDirection.NORTH, ForgeDirection.UP, ForgeDirection.DOWN)

    def checkSideForFace(n: Int, facing: ForgeDirection) = checkSide(n, ForgeDirection.VALID_DIRECTIONS.filter(_ != facing.getOpposite): _*)

    private def checkSide(n: Int, allowed: ForgeDirection*) = {
      val side = args.checkInteger(n)
      if (side < 0 || side > 5) {
        throw new IllegalArgumentException("invalid side")
      }
      val direction = ForgeDirection.getOrientation(side)
      if (allowed.isEmpty || (allowed contains direction)) direction
      else throw new IllegalArgumentException("unsupported side")
    }
  }

}