NaturesAura/src/main/java/de/ellpeck/naturesaura/items/tools/ItemShovel.java

package de.ellpeck.naturesaura.items.tools;

import de.ellpeck.naturesaura.data.ItemModelGenerator;
import de.ellpeck.naturesaura.items.ModItems;
import de.ellpeck.naturesaura.reg.ICustomItemModel;
import de.ellpeck.naturesaura.reg.IModItem;
import de.ellpeck.naturesaura.reg.ModRegistry;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.util.Mth;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.item.BlockItem;
import net.minecraft.world.item.ShovelItem;
import net.minecraft.world.item.Tier;
import net.minecraft.world.item.context.UseOnContext;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.phys.BlockHitResult;

import java.util.ArrayList;

public class ItemShovel extends ShovelItem implements IModItem, ICustomItemModel {

    private final String baseName;

    public ItemShovel(String baseName, Tier material, float damage, float speed) {
        super(material, damage, speed, new Properties());
        this.baseName = baseName;
        ModRegistry.ALL_ITEMS.add(this);
    }

    @Override
    public InteractionResult useOn(UseOnContext context) {
        var level = context.getLevel();
        var player = context.getPlayer();
        var stack = player.getItemInHand(context.getHand());
        var pos = context.getClickedPos();
        var state = level.getBlockState(pos);

        // turning dirt to grass
        if (this == ModItems.INFUSED_IRON_SHOVEL || this == ModItems.DEPTH_SHOVEL) {
            if ((state.getBlock() == Blocks.DIRT || state.getBlock() == Blocks.MYCELIUM) && level.getBlockState(pos.above()).isAir()) {
                level.setBlockAndUpdate(pos, Blocks.GRASS_BLOCK.defaultBlockState());
                var damage = 5F;

                if (this == ModItems.DEPTH_SHOVEL && !level.isClientSide) {
                    var possible = new ArrayList<BlockPos>();
                    for (var x = -5; x <= 5; x++) {
                        for (var z = -5; z <= 5; z++) {
                            for (var y = -1; y <= 1; y++) {
                                var offset = pos.offset(x, y, z);
                                var offState = level.getBlockState(offset);
                                if ((offState.getBlock() == Blocks.DIRT || offState.getBlock() == Blocks.MYCELIUM) && level.getBlockState(offset.above()).isAir())
                                    possible.add(offset);
                            }
                        }
                    }
                    for (var i = 0; i < 63 && !possible.isEmpty(); i++) {
                        level.setBlockAndUpdate(possible.get(level.random.nextInt(possible.size())), Blocks.GRASS_BLOCK.defaultBlockState());
                        damage += 0.25F;
                    }
                }

                level.playSound(player, pos, SoundEvents.GRASS_PLACE, SoundSource.BLOCKS, 1.0F, 1.0F);
                stack.hurtAndBreak(Mth.ceil(damage), player, p -> p.broadcastBreakEvent(context.getHand()));
                return InteractionResult.SUCCESS;
            }
        }

        // flattening a large area
        if (this == ModItems.INFUSED_IRON_SHOVEL) {
            var flattened = false;
            var range = player.isShiftKeyDown() ? 0 : 1;
            for (var x = -range; x <= range; x++) {
                for (var y = -range; y <= range; y++) {
                    var actualPos = pos.offset(x, 0, y);
                    var facing = context.getClickedFace();
                    if (player.mayUseItemAt(actualPos.relative(facing), facing, stack)) {
                        if (facing != Direction.DOWN
                                && level.getBlockState(actualPos.above()).isAir()
                                && level.getBlockState(actualPos).getBlock() == Blocks.GRASS_BLOCK) {
                            if (!level.isClientSide)
                                level.setBlock(actualPos, Blocks.DIRT_PATH.defaultBlockState(), 11);
                            flattened = true;
                        }
                    }
                }
            }
            if (flattened) {
                level.playSound(player, pos, SoundEvents.SHOVEL_FLATTEN, SoundSource.BLOCKS, 1.0F, 1.0F);
                stack.hurtAndBreak(1, player, p -> p.broadcastBreakEvent(context.getHand()));
                return InteractionResult.SUCCESS;
            }
        }

        // sky shovel swapping
        if (this == ModItems.SKY_SHOVEL) {
            if (this.getDestroySpeed(stack, state) <= 1)
                return super.useOn(context);
            var otherHand = context.getHand() == InteractionHand.MAIN_HAND ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND;
            var other = player.getItemInHand(otherHand);
            if (other.isEmpty() || !(other.getItem() instanceof BlockItem))
                return super.useOn(context);
            level.removeBlock(pos, false);
            var tile = state.hasBlockEntity() ? level.getBlockEntity(pos) : null;
            Block.dropResources(state, level, pos, tile, null, stack);
            var newContext = new UseOnContext(player, otherHand, new BlockHitResult(context.getClickLocation(), context.getClickedFace(), context.getClickedPos(), context.isInside()));
            other.useOn(newContext);
            stack.hurtAndBreak(1, player, p -> p.broadcastBreakEvent(context.getHand()));
            return InteractionResult.SUCCESS;
        }

        return super.useOn(context);
    }

    @Override
    public String getBaseName() {
        return this.baseName;
    }

    @Override
    public void generateCustomItemModel(ItemModelGenerator generator) {
        generator.withExistingParent(this.getBaseName(), "item/handheld").texture("layer0", "item/" + this.getBaseName());
    }

}