package crazypants.enderio.rail;

import java.util.ArrayList;
import java.util.List;

import net.minecraft.entity.item.EntityMinecart;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.util.AxisAlignedBB;
import net.minecraftforge.common.util.ForgeDirection;

import com.enderio.core.common.util.BlockCoord;
import com.enderio.core.common.util.EntityUtil;

import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import cpw.mods.fml.common.gameevent.TickEvent;
import crazypants.enderio.EnderIO;
import crazypants.enderio.machine.transceiver.TileTransceiver;

public class PlayerTeleportHandler {

  public static final PlayerTeleportHandler instance = new PlayerTeleportHandler();

  List<TeleportAction> queue = new ArrayList<TeleportAction>();

  @SubscribeEvent
  public void onServerTick(TickEvent.ServerTickEvent event) {
    if(event.phase != TickEvent.Phase.END) {
      return;
    }
    for (TeleportAction action : queue) {
      action.doTeleport();
    }
    queue.clear();
  }

  public void teleportPlayer(TileTransceiver reciever, EntityPlayerMP playerToTP, EntityMinecart playerToMount) {
    //Need to quete these as we cant perform the operation during a tile entities update phase as
    //we need to remove the player from being tracked 
    queue.add(new TeleportAction(reciever, playerToTP, playerToMount));
  }

  private static class TeleportAction {

    TileTransceiver reciever;
    EntityPlayerMP playerToTP;
    EntityMinecart playerToMount;

    private TeleportAction(TileTransceiver reciever, EntityPlayerMP playerToTP, EntityMinecart playerToMount) {
      this.reciever = reciever;
      this.playerToTP = playerToTP;
      this.playerToMount = playerToMount;
    }

    void doTeleport() {
      int toDim = reciever.getWorldObj().provider.dimensionId;
      int meta = reciever.getBlockMetadata();

      //Make sure player not on the track and is in a safe position
      ForgeDirection railDir = EnderIO.blockEnderRail.getDirection(meta);
      int xOffset = Math.abs(railDir.offsetX);
      int zOffset = Math.abs(railDir.offsetZ);
      BlockCoord startPos = new BlockCoord(reciever).getLocation(ForgeDirection.UP);
      boolean foundSpot = false;
      for (int i = 1; i < 3 && !foundSpot; i++) {
        //try each side of the track
        playerToTP.setPosition(startPos.x + 0.5 - (xOffset * i), startPos.y, startPos.z + 0.5 - (zOffset * i));
        List<AxisAlignedBB> collides = EntityUtil.getCollidingBlockGeometry(reciever.getWorldObj(), playerToTP);
        foundSpot = collides == null || collides.isEmpty();
        if(!foundSpot) {
          playerToTP.setPosition(startPos.x + 0.5 + (xOffset * i), startPos.y, startPos.z + 0.5 + (zOffset * i));
          collides = EntityUtil.getCollidingBlockGeometry(reciever.getWorldObj(), playerToTP);
          foundSpot = collides == null || collides.isEmpty();
        }
      }
      if(!foundSpot) {
        //If not space each side will have to spawn on the track
        playerToTP.setPosition(startPos.x + 0.5, startPos.y, startPos.z + 0.5);
      }
//      ChunkCoordinates spawn = new ChunkCoordinates((int) playerToTP.posX, (int) playerToTP.posY, (int) playerToTP.posZ);
//      TeleportUtil.teleportPlayer((WorldServer) reciever.getWorldObj(), playerToTP, toDim, spawn);
            
      reciever.getRailController().onPlayerTeleported(playerToTP, playerToMount);
      playerToTP.mcServer.getConfigurationManager().transferPlayerToDimension(playerToTP, toDim, new TeleporterEIO( playerToTP.mcServer.worldServerForDimension(toDim)));      
    }

  }
}