NaturesAura/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntitySpring.java

package de.ellpeck.naturesaura.blocks.tiles;

import de.ellpeck.naturesaura.api.aura.chunk.IAuraChunk;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.sounds.SoundSource;
import net.minecraft.tags.FluidTags;
import net.minecraft.util.Mth;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.properties.BlockStateProperties;
import net.minecraft.world.level.material.Fluids;
import net.minecraft.world.phys.AABB;
import net.minecraftforge.common.FarmlandWaterManager;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.ForgeCapabilities;
import net.minecraftforge.common.ticket.AABBTicket;
import net.minecraftforge.common.util.LazyOptional;
import net.minecraftforge.event.ForgeEventFactory;
import net.minecraftforge.fluids.FluidStack;
import net.minecraftforge.fluids.IFluidTank;
import net.minecraftforge.fluids.capability.IFluidHandler;

public class BlockEntitySpring extends BlockEntityImpl implements ITickableBlockEntity {

    private final LazyOptional<IFluidHandler> tank = LazyOptional.of(InfiniteTank::new);
    private AABBTicket waterTicket;

    public BlockEntitySpring(BlockPos pos, BlockState state) {
        super(ModBlockEntities.SPRING, pos, state);
    }

    @Override
    public void onLoad() {
        super.onLoad();
        if (!this.level.isClientSide) {
            // add a ticket to water crops
            var area = new AABB(this.worldPosition).inflate(5, 1, 5);
            this.waterTicket = FarmlandWaterManager.addAABBTicket(this.level, area);
        }
    }

    @Override
    public void setRemoved() {
        super.setRemoved();
        if (!this.level.isClientSide && this.waterTicket != null && this.waterTicket.isValid()) {
            this.waterTicket.invalidate();
            this.waterTicket = null;
        }
        this.tank.invalidate();
    }

    @Override
    public void tick() {
        if (this.level.isClientSide || this.level.getGameTime() % 35 != 0)
            return;

        // fill cauldrons
        var up = this.worldPosition.above();
        var upState = this.level.getBlockState(up);
        if (upState.hasProperty(BlockStateProperties.LEVEL_CAULDRON)) {
            int level = upState.getValue(BlockStateProperties.LEVEL_CAULDRON);
            if (level < 3 && this.tryConsumeAura(2500)) {
                this.level.setBlockAndUpdate(up, upState.setValue(BlockStateProperties.LEVEL_CAULDRON, level + 1));
                this.level.playSound(null, up, SoundEvents.BUCKET_FILL, SoundSource.BLOCKS, 1, 1);
                return;
            }
        }

        // wet sponges
        var spongeRadius = 2;
        for (var x = -spongeRadius; x <= spongeRadius; x++) {
            for (var y = -spongeRadius; y <= spongeRadius; y++) {
                for (var z = -spongeRadius; z <= spongeRadius; z++) {
                    var pos = this.worldPosition.offset(x, y, z);
                    var state = this.level.getBlockState(pos);
                    if (state.getBlock() == Blocks.SPONGE && this.tryConsumeAura(2500)) {
                        this.level.setBlock(pos, Blocks.WET_SPONGE.defaultBlockState(), 2);
                        this.level.levelEvent(2001, pos, Block.getId(Blocks.WATER.defaultBlockState()));
                        return;
                    }
                }
            }
        }

        // generate obsidian
        for (var dir : Direction.Plane.HORIZONTAL) {
            var side = this.worldPosition.relative(dir);
            if (this.isLava(side, true) && this.tryConsumeAura(1500)) {
                this.level.setBlockAndUpdate(side, ForgeEventFactory.fireFluidPlaceBlockEvent(this.level, side, side, Blocks.OBSIDIAN.defaultBlockState()));
                this.level.levelEvent(1501, side, 0);
                return;
            }
        }

        // generate stone
        var twoUp = this.worldPosition.above(2);
        if (this.isLava(twoUp, false) && (this.level.getBlockState(up).isAir() || this.isLava(up, false)) && this.tryConsumeAura(150)) {
            this.level.setBlockAndUpdate(up, ForgeEventFactory.fireFluidPlaceBlockEvent(this.level, up, twoUp, Blocks.STONE.defaultBlockState()));
            this.level.levelEvent(1501, up, 0);
            return;
        }

        // generate cobblestone
        for (var dir : Direction.Plane.HORIZONTAL) {
            var twoSide = this.worldPosition.relative(dir, 2);
            var side = this.worldPosition.relative(dir);
            if (this.isLava(twoSide, false) && (this.level.getBlockState(side).isAir() || this.isLava(side, false)) && this.tryConsumeAura(100)) {
                this.level.setBlockAndUpdate(side, ForgeEventFactory.fireFluidPlaceBlockEvent(this.level, side, twoSide, Blocks.COBBLESTONE.defaultBlockState()));
                this.level.levelEvent(1501, side, 0);
                return;
            }
        }
    }

    @Override
    public <T> LazyOptional<T> getCapability(Capability<T> capability, Direction facing) {
        if (capability == ForgeCapabilities.FLUID_HANDLER)
            return this.tank.cast();
        return LazyOptional.empty();
    }

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

    public boolean tryConsumeAura(int amount) {
        if (!this.canUseRightNow(amount))
            return false;
        var pos = IAuraChunk.getHighestSpot(this.level, this.worldPosition, 35, this.worldPosition);
        IAuraChunk.getAuraChunk(this.level, pos).drainAura(pos, amount);
        return true;
    }

    private boolean isLava(BlockPos offset, boolean source) {
        var state = this.level.getFluidState(offset);
        return (!source || state.isSource()) && state.is(FluidTags.LAVA);
    }

    private class InfiniteTank implements IFluidTank, IFluidHandler {

        @Override
        public FluidStack getFluid() {
            return new FluidStack(Fluids.WATER, 1000);
        }

        @Override
        public int getFluidAmount() {
            return 1000;
        }

        @Override
        public int getCapacity() {
            return 1000;
        }

        @Override
        public boolean isFluidValid(FluidStack stack) {
            return stack.getFluid().defaultFluidState().is(FluidTags.WATER);
        }

        @Override
        public int fill(FluidStack resource, IFluidHandler.FluidAction action) {
            return 0;
        }

        @Override
        public FluidStack drain(int maxDrain, IFluidHandler.FluidAction action) {
            var drain = Math.min(maxDrain, 1000);
            var auraUsed = Mth.ceil(drain / 2F);
            if (!BlockEntitySpring.this.canUseRightNow(auraUsed))
                return FluidStack.EMPTY;
            if (action.execute())
                BlockEntitySpring.this.tryConsumeAura(auraUsed);
            return new FluidStack(Fluids.WATER, drain);
        }

        @Override
        public FluidStack drain(FluidStack resource, IFluidHandler.FluidAction action) {
            if (this.isFluidValid(resource))
                return this.drain(resource.getAmount(), action);
            return FluidStack.EMPTY;
        }

        @Override
        public int getTanks() {
            return 1;
        }

        @Override
        public FluidStack getFluidInTank(int tank) {
            return this.getFluid();
        }

        @Override
        public int getTankCapacity(int tank) {
            return this.getCapacity();
        }

        @Override
        public boolean isFluidValid(int tank, FluidStack stack) {
            return this.isFluidValid(stack);
        }
    }
}