content: package net.minecraft.world.gen.feature;
  
  import net.minecraft.block.Block;
  import net.minecraft.block.material.Material;
  import net.minecraft.init.Blocks;
  import net.minecraft.util.BlockPos;
  import net.minecraft.world.EnumSkyBlock;
  import net.minecraft.world.World;
  import net.minecraft.world.biome.BiomeGenBase;
  
  import java.util.Random;
  
  public class WorldGenLakes extends WorldGenerator {
      private final Block block;
  
      public WorldGenLakes(Block blockIn) {
          this.block = blockIn;
      }
  
      public boolean generate(World worldIn, Random rand, BlockPos position) {
          for (position = position.add(-8, 0, -8); position.getY() > 5 && worldIn.isAirBlock(position); position = position.down()) {
          }
  
          if (position.getY() <= 4) {
              return false;
          } else {
              position = position.down(4);
              boolean[] aboolean = new boolean[2048];
              int i = rand.nextInt(4) + 4;
  
              for (int j = 0; j < i; ++j) {
                  double d0 = rand.nextDouble() * 6.0D + 3.0D;
                  double d1 = rand.nextDouble() * 4.0D + 2.0D;
                  double d2 = rand.nextDouble() * 6.0D + 3.0D;
                  double d3 = rand.nextDouble() * (16.0D - d0 - 2.0D) + 1.0D + d0 / 2.0D;
                  double d4 = rand.nextDouble() * (8.0D - d1 - 4.0D) + 2.0D + d1 / 2.0D;
                  double d5 = rand.nextDouble() * (16.0D - d2 - 2.0D) + 1.0D + d2 / 2.0D;
  
                  for (int l = 1; l < 15; ++l) {
                      for (int i1 = 1; i1 < 15; ++i1) {
                          for (int j1 = 1; j1 < 7; ++j1) {
                              double d6 = ((double) l - d3) / (d0 / 2.0D);
                              double d7 = ((double) j1 - d4) / (d1 / 2.0D);
                              double d8 = ((double) i1 - d5) / (d2 / 2.0D);
                              double d9 = d6 * d6 + d7 * d7 + d8 * d8;
  
                              if (d9 < 1.0D) {
                                  aboolean[(l * 16 + i1) * 8 + j1] = true;
                              }
                          }
                      }
                  }
              }
  
              for (int k1 = 0; k1 < 16; ++k1) {
                  for (int l2 = 0; l2 < 16; ++l2) {
                      for (int k = 0; k < 8; ++k) {
                          boolean flag = !aboolean[(k1 * 16 + l2) * 8 + k] && (k1 < 15 && aboolean[((k1 + 1) * 16 + l2) * 8 + k] || k1 > 0 && aboolean[((k1 - 1) * 16 + l2) * 8 + k] || l2 < 15 && aboolean[(k1 * 16 + l2 + 1) * 8 + k] || l2 > 0 && aboolean[(k1 * 16 + (l2 - 1)) * 8 + k] || k < 7 && aboolean[(k1 * 16 + l2) * 8 + k + 1] || k > 0 && aboolean[(k1 * 16 + l2) * 8 + (k - 1)]);
  
                          if (flag) {
                              Material material = worldIn.getBlockState(position.add(k1, k, l2)).getBlock().getMaterial();
  
                              if (k >= 4 && material.isLiquid()) {
                                  return false;
                              }
  
                              if (k < 4 && !material.isSolid() && worldIn.getBlockState(position.add(k1, k, l2)).getBlock() != this.block) {
                                  return false;
                              }
                          }
                      }
                  }
              }
  
              for (int l1 = 0; l1 < 16; ++l1) {
                  for (int i3 = 0; i3 < 16; ++i3) {
                      for (int i4 = 0; i4 < 8; ++i4) {
                          if (aboolean[(l1 * 16 + i3) * 8 + i4]) {
                              worldIn.setBlockState(position.add(l1, i4, i3), i4 >= 4 ? Blocks.air.getDefaultState() : this.block.getDefaultState(), 2);
                          }
                      }
                  }
              }
  
              for (int i2 = 0; i2 < 16; ++i2) {
                  for (int j3 = 0; j3 < 16; ++j3) {
                      for (int j4 = 4; j4 < 8; ++j4) {
                          if (aboolean[(i2 * 16 + j3) * 8 + j4]) {
                              BlockPos blockpos = position.add(i2, j4 - 1, j3);
  
                              if (worldIn.getBlockState(blockpos).getBlock() == Blocks.dirt && worldIn.getLightFor(EnumSkyBlock.SKY, position.add(i2, j4, j3)) > 0) {
                                  BiomeGenBase biomegenbase = worldIn.getBiomeGenForCoords(blockpos);
  
                                  if (biomegenbase.topBlock.getBlock() == Blocks.mycelium) {
                                      worldIn.setBlockState(blockpos, Blocks.mycelium.getDefaultState(), 2);
                                  } else {
                                      worldIn.setBlockState(blockpos, Blocks.grass.getDefaultState(), 2);
                                  }
                              }
                          }
                      }
                  }
              }
  
              if (this.block.getMaterial() == Material.lava) {
                  for (int j2 = 0; j2 < 16; ++j2) {
                      for (int k3 = 0; k3 < 16; ++k3) {
                          for (int k4 = 0; k4 < 8; ++k4) {
                              boolean flag1 = !aboolean[(j2 * 16 + k3) * 8 + k4] && (j2 < 15 && aboolean[((j2 + 1) * 16 + k3) * 8 + k4] || j2 > 0 && aboolean[((j2 - 1) * 16 + k3) * 8 + k4] || k3 < 15 && aboolean[(j2 * 16 + k3 + 1) * 8 + k4] || k3 > 0 && aboolean[(j2 * 16 + (k3 - 1)) * 8 + k4] || k4 < 7 && aboolean[(j2 * 16 + k3) * 8 + k4 + 1] || k4 > 0 && aboolean[(j2 * 16 + k3) * 8 + (k4 - 1)]);
  
                              if (flag1 && (k4 < 4 || rand.nextInt(2) != 0) && worldIn.getBlockState(position.add(j2, k4, k3)).getBlock().getMaterial().isSolid()) {
                                  worldIn.setBlockState(position.add(j2, k4, k3), Blocks.stone.getDefaultState(), 2);
                              }
                          }
                      }
                  }
              }
  
              if (this.block.getMaterial() == Material.water) {
                  for (int k2 = 0; k2 < 16; ++k2) {
                      for (int l3 = 0; l3 < 16; ++l3) {
                          int l4 = 4;
  
                          if (worldIn.canBlockFreezeWater(position.add(k2, l4, l3))) {
                              worldIn.setBlockState(position.add(k2, l4, l3), Blocks.ice.getDefaultState(), 2);
                          }
                      }
                  }
              }
  
              return true;
          }
      }
  }
  