/*
 * This file ("TileEntityLaserRelayFluids.java") is part of the Actually Additions mod for Minecraft.
 * It is created and owned by Ellpeck and distributed
 * under the Actually Additions License to be found at
 * http://ellpeck.de/actaddlicense
 * View the source code at https://github.com/Ellpeck/ActuallyAdditions
 *
 * © 2015-2017 Ellpeck
 */

package de.ellpeck.actuallyadditions.mod.tile;

import de.ellpeck.actuallyadditions.api.laser.IConnectionPair;
import de.ellpeck.actuallyadditions.api.laser.LaserType;
import de.ellpeck.actuallyadditions.api.laser.Network;
import de.ellpeck.actuallyadditions.mod.tile.TileEntityLaserRelayEnergy.Mode;
import de.ellpeck.actuallyadditions.mod.util.ModUtil;
import de.ellpeck.actuallyadditions.mod.util.StringUtil;
import de.ellpeck.actuallyadditions.mod.util.WorldUtil;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.text.TextFormatting;
import net.minecraftforge.fluids.FluidStack;
import net.minecraftforge.fluids.capability.CapabilityFluidHandler;
import net.minecraftforge.fluids.capability.IFluidHandler;
import net.minecraftforge.fluids.capability.IFluidTankProperties;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

public class TileEntityLaserRelayFluids extends TileEntityLaserRelay{

    public final ConcurrentHashMap<EnumFacing, TileEntity> handlersAround = new ConcurrentHashMap<EnumFacing, TileEntity>();
    private final IFluidHandler[] fluidHandlers = new IFluidHandler[6];
    private Mode mode = Mode.BOTH;

    public TileEntityLaserRelayFluids(){
        super("laserRelayFluids", LaserType.FLUID);

        for(int i = 0; i < this.fluidHandlers.length; i++){
            final EnumFacing facing = EnumFacing.values()[i];
            this.fluidHandlers[i] = new IFluidHandler(){
                @Override
                public IFluidTankProperties[] getTankProperties(){
                    return new IFluidTankProperties[0];
                }

                @Override
                public int fill(FluidStack resource, boolean doFill){
                    return TileEntityLaserRelayFluids.this.transmitFluid(facing, resource, doFill);
                }

                @Override
                public FluidStack drain(FluidStack resource, boolean doDrain){
                    return null;
                }

                @Override
                public FluidStack drain(int maxDrain, boolean doDrain){
                    return null;
                }
            };
        }
    }

    @Override
    public void updateEntity(){
        super.updateEntity();

        if(!this.world.isRemote){
            if(this.mode == Mode.INPUT_ONLY){
                for(EnumFacing side : this.handlersAround.keySet()){
                    WorldUtil.doFluidInteraction(this.handlersAround.get(side), this, side.getOpposite(), Integer.MAX_VALUE);
                }
            }
        }
    }

    @Override
    public boolean shouldSaveDataOnChangeOrWorldStart(){
        return true;
    }

    @Override
    public void saveDataOnChangeOrWorldStart(){
        Map<EnumFacing, TileEntity> old = new HashMap<EnumFacing, TileEntity>(this.handlersAround);
        boolean change = false;

        this.handlersAround.clear();
        for(EnumFacing side : EnumFacing.values()){
            BlockPos pos = this.getPos().offset(side);
            if(this.world.isBlockLoaded(pos)){
                TileEntity tile = this.world.getTileEntity(pos);
                if(tile != null && !(tile instanceof TileEntityLaserRelay)){
                    if(tile.hasCapability(CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY, side.getOpposite())){
                        this.handlersAround.put(side, tile);

                        TileEntity oldTile = old.get(side);
                        if(oldTile == null || !tile.equals(oldTile)){
                            change = true;
                        }
                    }
                }
            }
        }

        if(change || old.size() != this.handlersAround.size()){
            Network network = this.getNetwork();
            if(network != null){
                network.changeAmount++;
            }
        }
    }

    @Override
    public IFluidHandler getFluidHandler(EnumFacing facing){
        return this.fluidHandlers[facing == null ? 0 : facing.ordinal()];
    }

    private int transmitFluid(EnumFacing from, FluidStack stack, boolean doFill){
        int transmitted = 0;
        if(stack != null && this.mode != Mode.OUTPUT_ONLY){
            Network network = this.getNetwork();
            if(network != null){
                transmitted = this.transferFluidToReceiverInNeed(from, network, stack, doFill);
            }
        }
        return transmitted;
    }

    private int transferFluidToReceiverInNeed(EnumFacing from, Network network, FluidStack stack, boolean doFill){
        int transmitted = 0;
        //Keeps track of all the Laser Relays and Energy Acceptors that have been checked already to make nothing run multiple times
        Set<BlockPos> alreadyChecked = new HashSet<BlockPos>();

        Set<TileEntityLaserRelayFluids> relaysThatWork = new HashSet<TileEntityLaserRelayFluids>();
        int totalReceiverAmount = 0;

        for(IConnectionPair pair : network.connections){
            for(BlockPos relay : pair.getPositions()){
                if(relay != null && this.world.isBlockLoaded(relay) && !alreadyChecked.contains(relay)){
                    alreadyChecked.add(relay);
                    TileEntity relayTile = this.world.getTileEntity(relay);
                    if(relayTile instanceof TileEntityLaserRelayFluids){
                        TileEntityLaserRelayFluids theRelay = (TileEntityLaserRelayFluids)relayTile;
                        if(theRelay.mode != Mode.INPUT_ONLY){
                            boolean workedOnce = false;

                            for(EnumFacing facing : theRelay.handlersAround.keySet()){
                                if(theRelay != this || facing != from){
                                    TileEntity tile = theRelay.handlersAround.get(facing);

                                    EnumFacing opp = facing.getOpposite();
                                    if(tile.hasCapability(CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY, opp)){
                                        IFluidHandler cap = tile.getCapability(CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY, opp);
                                        if(cap != null && cap.fill(stack, false) > 0){
                                            totalReceiverAmount++;
                                            workedOnce = true;
                                        }
                                    }
                                }
                            }

                            if(workedOnce){
                                relaysThatWork.add(theRelay);
                            }
                        }
                    }
                }
            }
        }

        if(totalReceiverAmount > 0 && !relaysThatWork.isEmpty()){
            int amountPer = stack.amount/totalReceiverAmount;
            if(amountPer <= 0){
                amountPer = stack.amount;
            }

            for(TileEntityLaserRelayFluids theRelay : relaysThatWork){
                for(Map.Entry<EnumFacing, TileEntity> receiver : theRelay.handlersAround.entrySet()){
                    if(receiver != null){
                        EnumFacing side = receiver.getKey();
                        EnumFacing opp = side.getOpposite();
                        TileEntity tile = receiver.getValue();
                        if(!alreadyChecked.contains(tile.getPos())){
                            alreadyChecked.add(tile.getPos());
                            if(theRelay != this || side != from){
                                if(tile.hasCapability(CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY, opp)){
                                    IFluidHandler cap = tile.getCapability(CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY, opp);
                                    if(cap != null){
                                        FluidStack copy = stack.copy();
                                        copy.amount = amountPer;
                                        transmitted += cap.fill(copy, doFill);
                                    }
                                }

                                //If everything that could be transmitted was transmitted
                                if(transmitted >= stack.amount){
                                    return transmitted;
                                }
                            }
                        }
                    }
                }
            }
        }

        return transmitted;
    }

    @Override
    @SideOnly(Side.CLIENT)
    public String getExtraDisplayString(){
        return StringUtil.localize("info."+ModUtil.MOD_ID+".laserRelay.fluid.extra")+": "+TextFormatting.DARK_RED+StringUtil.localize(this.mode.name)+TextFormatting.RESET;
    }

    @Override
    @SideOnly(Side.CLIENT)
    public String getCompassDisplayString(){
        return TextFormatting.GREEN+StringUtil.localize("info."+ModUtil.MOD_ID+".laserRelay.energy.display");
    }

    @Override
    public void onCompassAction(EntityPlayer player){
        this.mode = this.mode.getNext();
    }

    @Override
    public void writeSyncableNBT(NBTTagCompound compound, NBTType type){
        super.writeSyncableNBT(compound, type);

        if(type != NBTType.SAVE_BLOCK){
            compound.setString("Mode", this.mode.toString());
        }
    }

    @Override
    public void readSyncableNBT(NBTTagCompound compound, NBTType type){
        super.readSyncableNBT(compound, type);

        if(type != NBTType.SAVE_BLOCK){
            String modeStrg = compound.getString("Mode");
            if(modeStrg != null && !modeStrg.isEmpty()){
                this.mode = Mode.valueOf(modeStrg);
            }
        }
    }
}