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package com.microsoft.Malmo.MissionHandlers;

import com.microsoft.Malmo.MalmoMod;
import com.microsoft.Malmo.Schemas.*;
import com.microsoft.Malmo.Schemas.MissionInit;
import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.client.entity.EntityPlayerSP;

import com.microsoft.Malmo.MissionHandlerInterfaces.ICommandHandler;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.RayTraceResult;

/**
 * @author Cayden Codel, Carnegie Mellon University
 * <p>
 * Place commands allow agents to place blocks in the world without having to worry about inventory management.
 */
public class PlaceCommandsImplementation extends CommandBase implements ICommandHandler {
    private boolean isOverriding;

    @Override
    protected boolean onExecute(String verb, String parameter, MissionInit missionInit) {
        EntityPlayerSP player = Minecraft.getMinecraft().player;
        if (player == null)
            return false;

        if (!verb.equalsIgnoreCase("place"))
            return false;

        Item item = Item.getByNameOrId(parameter);
        Block block = Block.getBlockFromItem(item);
        if (item == null || item.getRegistryName() == null || block.getRegistryName() == null)
            return false;

        InventoryPlayer inv = player.inventory;
        boolean blockInInventory = false;
        ItemStack stackInInventory = null;
        int stackIndex = -1;
        for (int i = 0; !blockInInventory && i < inv.getSizeInventory(); i++) {
            Item stack = inv.getStackInSlot(i).getItem();
            if (stack.getRegistryName() != null && stack.getRegistryName().equals(item.getRegistryName())) {
                stackInInventory = inv.getStackInSlot(i);
                stackIndex = i;
                blockInInventory = true;
            }
        }

        // We don't have that item in our inventories
        if (!blockInInventory)
            return false;

        RayTraceResult mop = Minecraft.getMinecraft().objectMouseOver;
        if (mop.typeOfHit == RayTraceResult.Type.BLOCK) {
            BlockPos pos = mop.getBlockPos().add(mop.sideHit.getDirectionVec());
            // Can we place this block here?
            AxisAlignedBB axisalignedbb = block.getDefaultState().getCollisionBoundingBox(player.world, pos);
            if (axisalignedbb == null || player.world.checkNoEntityCollision(axisalignedbb.offset(pos), null)) {
                MalmoMod.network.sendToServer(new DiscreteMovementCommandsImplementation.UseActionMessage(mop.getBlockPos(), new ItemStack(block), mop.sideHit, false, mop.hitVec));
                if (stackInInventory.getCount() == 1)
                    inv.setInventorySlotContents(stackIndex, new ItemStack(Block.getBlockById(0)));
                else
                    stackInInventory.setCount(stackInInventory.getCount() - 1);
            }
        }

        return true;
    }

    @Override
    public boolean parseParameters(Object params) {
        if (!(params instanceof PlaceCommands))
            return false;

        PlaceCommands pParams = (PlaceCommands) params;
        setUpAllowAndDenyLists(pParams.getModifierList());
        return true;
    }

    @Override
    public void install(MissionInit missionInit) {
    }

    @Override
    public void deinstall(MissionInit missionInit) {
    }

    @Override
    public boolean isOverriding() {
        return this.isOverriding;
    }

    @Override
    public void setOverriding(boolean b) {
        this.isOverriding = b;
    }
}