Unicopia/src/main/java/com/minelittlepony/unicopia/item/JarItem.java

package com.minelittlepony.unicopia.item;

import com.minelittlepony.unicopia.entity.IItemEntity;
import com.minelittlepony.unicopia.entity.ItemImpl;
import com.minelittlepony.unicopia.particle.UParticles;
import com.minelittlepony.unicopia.projectile.MagicProjectileEntity;
import com.minelittlepony.unicopia.projectile.ProjectileDelegate;
import com.minelittlepony.unicopia.util.WorldEvent;

import net.minecraft.block.BlockState;
import net.minecraft.block.Blocks;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityType;
import net.minecraft.entity.ItemEntity;
import net.minecraft.entity.LightningEntity;
import net.minecraft.entity.Entity.RemovalReason;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.server.world.ServerWorld;
import net.minecraft.sound.SoundCategory;
import net.minecraft.sound.SoundEvents;
import net.minecraft.stat.Stats;
import net.minecraft.util.ActionResult;
import net.minecraft.util.Hand;
import net.minecraft.util.TypedActionResult;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraft.world.level.ServerWorldProperties;

public class JarItem extends Item implements ProjectileDelegate, ItemImpl.TickableItem {

    private final boolean rain;
    private final boolean thunder;
    private final boolean lightning;

    public JarItem(Settings settings, boolean rain, boolean thunder, boolean lightning) {
        super(settings);
        this.rain = rain;
        this.thunder = thunder;
        this.lightning = lightning;
    }

    @Override
    public TypedActionResult<ItemStack> use(World world, PlayerEntity player, Hand hand) {
        ItemStack stack = player.getStackInHand(hand);

        world.playSound(null, player.getX(), player.getY(), player.getZ(),
                SoundEvents.ENTITY_SNOWBALL_THROW, SoundCategory.NEUTRAL,
                0.5F,
                0.4F / (world.random.nextFloat() * 0.4F + 0.8F));

        if (!world.isClient) {
            MagicProjectileEntity projectile = new MagicProjectileEntity(world, player);
            projectile.setItem(stack);
            projectile.setThrowDamage(getProjectileDamage(stack));
            projectile.setProperties(player, player.getPitch(), player.getYaw(), 0, 1.5F, 1);

            world.spawnEntity(projectile);
        }

        player.incrementStat(Stats.USED.getOrCreateStat(this));

        if (!player.getAbilities().creativeMode) {
            stack.decrement(1);
        }

        return TypedActionResult.success(stack, world.isClient());
    }

    protected float getProjectileDamage(ItemStack stack) {
        return 0.5F;
    }

    @Override
    public ActionResult onGroundTick(IItemEntity item) {
        ItemEntity entity = item.get().getMaster();

        entity.setInvulnerable(true);

        if (!lightning
                && !entity.world.isClient
                && !entity.isRemoved()
                && entity.getItemAge() > 100
                && entity.world.isThundering()
                && entity.world.isSkyVisible(entity.getBlockPos())
                && entity.world.random.nextInt(130) == 0) {
            LightningEntity lightning = EntityType.LIGHTNING_BOLT.create(entity.world);
            lightning.refreshPositionAfterTeleport(entity.getX(), entity.getY(), entity.getZ());

            entity.remove(RemovalReason.DISCARDED);
            entity.world.spawnEntity(lightning);

            ItemEntity neu = EntityType.ITEM.create(entity.world);
            neu.copyPositionAndRotation(entity);
            neu.setStack(new ItemStack(this == UItems.RAIN_CLOUD_JAR ? UItems.STORM_CLOUD_JAR : UItems.LIGHTNING_JAR));
            neu.setInvulnerable(true);

            entity.world.spawnEntity(neu);

            ItemEntity copy = EntityType.ITEM.create(entity.world);
            copy.copyPositionAndRotation(entity);
            copy.setInvulnerable(true);
            copy.setStack(entity.getStack());
            copy.getStack().decrement(1);

            entity.world.spawnEntity(copy);
        }
        return ActionResult.PASS;
    }

    @Override
    public void onImpact(MagicProjectileEntity projectile, BlockPos pos, BlockState state) {
        onImpact(projectile);
    }

    @Override
    public void onImpact(MagicProjectileEntity projectile, Entity entity) {
        onImpact(projectile);
    }

    protected void onImpact(MagicProjectileEntity projectile) {
        if (!projectile.isClient()) {
            ServerWorld world = (ServerWorld)projectile.world;

            if (rain || thunder) {
                ServerWorldProperties props = ((ServerWorldProperties)world.getLevelProperties());

                int time = Math.max(Math.max(props.getRainTime(), props.getThunderTime()), 40);
                world.setWeather(0, time, rain, thunder);
            }

            if (lightning) {
                LightningEntity lightning = EntityType.LIGHTNING_BOLT.create(world);
                lightning.refreshPositionAfterTeleport(projectile.getX(), projectile.getY(), projectile.getZ());

                world.spawnEntity(lightning);
            }
        }

        if (rain || thunder) {
            projectile.world.syncWorldEvent(WorldEvent.PROJECTILE_HIT, projectile.getBlockPos(), thunder ? 0x888888 : 0xF8F8F8);

            for (int i = projectile.world.random.nextInt(3) + 1; i >= 0; i--) {
                projectile.world.addParticle(UParticles.CLOUDS_ESCAPING, true,
                        projectile.getX(), projectile.getY(), projectile.getZ(),
                        projectile.world.random.nextFloat() - 0.5,
                        0,
                        projectile.world.random.nextFloat() - 0.5
                );
            }
        }

        WorldEvent.play(WorldEvent.DESTROY_BLOCK, projectile.world, projectile.getBlockPos(), Blocks.GLASS.getDefaultState());
    }
}