content: package net.minecraft.world.gen;
  
  import com.google.common.base.Objects;
  import net.minecraft.block.BlockSand;
  import net.minecraft.block.material.Material;
  import net.minecraft.block.state.IBlockState;
  import net.minecraft.init.Blocks;
  import net.minecraft.util.BlockPos;
  import net.minecraft.util.MathHelper;
  import net.minecraft.world.World;
  import net.minecraft.world.chunk.ChunkPrimer;
  
  import java.util.Random;
  
  public class MapGenCaves extends MapGenBase {
      protected void func_180703_a(long p_180703_1_, int p_180703_3_, int p_180703_4_, ChunkPrimer p_180703_5_, double p_180703_6_, double p_180703_8_, double p_180703_10_) {
          this.func_180702_a(p_180703_1_, p_180703_3_, p_180703_4_, p_180703_5_, p_180703_6_, p_180703_8_, p_180703_10_, 1.0F + this.rand.nextFloat() * 6.0F, 0.0F, 0.0F, -1, -1, 0.5D);
      }
  
      protected void func_180702_a(long p_180702_1_, int p_180702_3_, int p_180702_4_, ChunkPrimer p_180702_5_, double p_180702_6_, double p_180702_8_, double p_180702_10_, float p_180702_12_, float p_180702_13_, float p_180702_14_, int p_180702_15_, int p_180702_16_, double p_180702_17_) {
          double d0 = p_180702_3_ * 16 + 8;
          double d1 = p_180702_4_ * 16 + 8;
          float f = 0.0F;
          float f1 = 0.0F;
          Random random = new Random(p_180702_1_);
  
          if (p_180702_16_ <= 0) {
              int i = this.range * 16 - 16;
              p_180702_16_ = i - random.nextInt(i / 4);
          }
  
          boolean flag2 = false;
  
          if (p_180702_15_ == -1) {
              p_180702_15_ = p_180702_16_ / 2;
              flag2 = true;
          }
  
          int j = random.nextInt(p_180702_16_ / 2) + p_180702_16_ / 4;
  
          for (boolean flag = random.nextInt(6) == 0; p_180702_15_ < p_180702_16_; ++p_180702_15_) {
              double d2 = 1.5D + (double) (MathHelper.sin((float) p_180702_15_ * (float) Math.PI / (float) p_180702_16_) * p_180702_12_ * 1.0F);
              double d3 = d2 * p_180702_17_;
              float f2 = MathHelper.cos(p_180702_14_);
              float f3 = MathHelper.sin(p_180702_14_);
              p_180702_6_ += MathHelper.cos(p_180702_13_) * f2;
              p_180702_8_ += f3;
              p_180702_10_ += MathHelper.sin(p_180702_13_) * f2;
  
              if (flag) {
                  p_180702_14_ = p_180702_14_ * 0.92F;
              } else {
                  p_180702_14_ = p_180702_14_ * 0.7F;
              }
  
              p_180702_14_ = p_180702_14_ + f1 * 0.1F;
              p_180702_13_ += f * 0.1F;
              f1 = f1 * 0.9F;
              f = f * 0.75F;
              f1 = f1 + (random.nextFloat() - random.nextFloat()) * random.nextFloat() * 2.0F;
              f = f + (random.nextFloat() - random.nextFloat()) * random.nextFloat() * 4.0F;
  
              if (!flag2 && p_180702_15_ == j && p_180702_12_ > 1.0F && p_180702_16_ > 0) {
                  this.func_180702_a(random.nextLong(), p_180702_3_, p_180702_4_, p_180702_5_, p_180702_6_, p_180702_8_, p_180702_10_, random.nextFloat() * 0.5F + 0.5F, p_180702_13_ - ((float) Math.PI / 2F), p_180702_14_ / 3.0F, p_180702_15_, p_180702_16_, 1.0D);
                  this.func_180702_a(random.nextLong(), p_180702_3_, p_180702_4_, p_180702_5_, p_180702_6_, p_180702_8_, p_180702_10_, random.nextFloat() * 0.5F + 0.5F, p_180702_13_ + ((float) Math.PI / 2F), p_180702_14_ / 3.0F, p_180702_15_, p_180702_16_, 1.0D);
                  return;
              }
  
              if (flag2 || random.nextInt(4) != 0) {
                  double d4 = p_180702_6_ - d0;
                  double d5 = p_180702_10_ - d1;
                  double d6 = p_180702_16_ - p_180702_15_;
                  double d7 = p_180702_12_ + 2.0F + 16.0F;
  
                  if (d4 * d4 + d5 * d5 - d6 * d6 > d7 * d7) {
                      return;
                  }
  
                  if (p_180702_6_ >= d0 - 16.0D - d2 * 2.0D && p_180702_10_ >= d1 - 16.0D - d2 * 2.0D && p_180702_6_ <= d0 + 16.0D + d2 * 2.0D && p_180702_10_ <= d1 + 16.0D + d2 * 2.0D) {
                      int k2 = MathHelper.floor_double(p_180702_6_ - d2) - p_180702_3_ * 16 - 1;
                      int k = MathHelper.floor_double(p_180702_6_ + d2) - p_180702_3_ * 16 + 1;
                      int l2 = MathHelper.floor_double(p_180702_8_ - d3) - 1;
                      int l = MathHelper.floor_double(p_180702_8_ + d3) + 1;
                      int i3 = MathHelper.floor_double(p_180702_10_ - d2) - p_180702_4_ * 16 - 1;
                      int i1 = MathHelper.floor_double(p_180702_10_ + d2) - p_180702_4_ * 16 + 1;
  
                      if (k2 < 0) {
                          k2 = 0;
                      }
  
                      if (k > 16) {
                          k = 16;
                      }
  
                      if (l2 < 1) {
                          l2 = 1;
                      }
  
                      if (l > 248) {
                          l = 248;
                      }
  
                      if (i3 < 0) {
                          i3 = 0;
                      }
  
                      if (i1 > 16) {
                          i1 = 16;
                      }
  
                      boolean flag3 = false;
  
                      for (int j1 = k2; !flag3 && j1 < k; ++j1) {
                          for (int k1 = i3; !flag3 && k1 < i1; ++k1) {
                              for (int l1 = l + 1; !flag3 && l1 >= l2 - 1; --l1) {
                                  if (l1 >= 0 && l1 < 256) {
                                      IBlockState iblockstate = p_180702_5_.getBlockState(j1, l1, k1);
  
                                      if (iblockstate.getBlock() == Blocks.flowing_water || iblockstate.getBlock() == Blocks.water) {
                                          flag3 = true;
                                      }
  
                                      if (l1 != l2 - 1 && j1 != k2 && j1 != k - 1 && k1 != i3 && k1 != i1 - 1) {
                                          l1 = l2;
                                      }
                                  }
                              }
                          }
                      }
  
                      if (!flag3) {
                          BlockPos.MutableBlockPos blockpos$mutableblockpos = new BlockPos.MutableBlockPos();
  
                          for (int j3 = k2; j3 < k; ++j3) {
                              double d10 = ((double) (j3 + p_180702_3_ * 16) + 0.5D - p_180702_6_) / d2;
  
                              for (int i2 = i3; i2 < i1; ++i2) {
                                  double d8 = ((double) (i2 + p_180702_4_ * 16) + 0.5D - p_180702_10_) / d2;
                                  boolean flag1 = false;
  
                                  if (d10 * d10 + d8 * d8 < 1.0D) {
                                      for (int j2 = l; j2 > l2; --j2) {
                                          double d9 = ((double) (j2 - 1) + 0.5D - p_180702_8_) / d3;
  
                                          if (d9 > -0.7D && d10 * d10 + d9 * d9 + d8 * d8 < 1.0D) {
                                              IBlockState iblockstate1 = p_180702_5_.getBlockState(j3, j2, i2);
                                              IBlockState iblockstate2 = Objects.firstNonNull(p_180702_5_.getBlockState(j3, j2 + 1, i2), Blocks.air.getDefaultState());
  
                                              if (iblockstate1.getBlock() == Blocks.grass || iblockstate1.getBlock() == Blocks.mycelium) {
                                                  flag1 = true;
                                              }
  
                                              if (this.func_175793_a(iblockstate1, iblockstate2)) {
                                                  if (j2 - 1 < 10) {
                                                      p_180702_5_.setBlockState(j3, j2, i2, Blocks.lava.getDefaultState());
                                                  } else {
                                                      p_180702_5_.setBlockState(j3, j2, i2, Blocks.air.getDefaultState());
  
                                                      if (iblockstate2.getBlock() == Blocks.sand) {
                                                          p_180702_5_.setBlockState(j3, j2 + 1, i2, iblockstate2.getValue(BlockSand.VARIANT) == BlockSand.EnumType.RED_SAND ? Blocks.red_sandstone.getDefaultState() : Blocks.sandstone.getDefaultState());
                                                      }
  
                                                      if (flag1 && p_180702_5_.getBlockState(j3, j2 - 1, i2).getBlock() == Blocks.dirt) {
                                                          blockpos$mutableblockpos.set(j3 + p_180702_3_ * 16, 0, i2 + p_180702_4_ * 16);
                                                          p_180702_5_.setBlockState(j3, j2 - 1, i2, this.worldObj.getBiomeGenForCoords(blockpos$mutableblockpos).topBlock.getBlock().getDefaultState());
                                                      }
                                                  }
                                              }
                                          }
                                      }
                                  }
                              }
                          }
  
                          if (flag2) {
                              break;
                          }
                      }
                  }
              }
          }
      }
  
      protected boolean func_175793_a(IBlockState p_175793_1_, IBlockState p_175793_2_) {
          return p_175793_1_.getBlock() == Blocks.stone || (p_175793_1_.getBlock() == Blocks.dirt || (p_175793_1_.getBlock() == Blocks.grass || (p_175793_1_.getBlock() == Blocks.hardened_clay || (p_175793_1_.getBlock() == Blocks.stained_hardened_clay || (p_175793_1_.getBlock() == Blocks.sandstone || (p_175793_1_.getBlock() == Blocks.red_sandstone || (p_175793_1_.getBlock() == Blocks.mycelium || (p_175793_1_.getBlock() == Blocks.snow_layer || (p_175793_1_.getBlock() == Blocks.sand || p_175793_1_.getBlock() == Blocks.gravel) && p_175793_2_.getBlock().getMaterial() != Material.water))))))));
      }
  
      protected void recursiveGenerate(World worldIn, int chunkX, int chunkZ, int p_180701_4_, int p_180701_5_, ChunkPrimer chunkPrimerIn) {
          int i = this.rand.nextInt(this.rand.nextInt(this.rand.nextInt(15) + 1) + 1);
  
          if (this.rand.nextInt(7) != 0) {
              i = 0;
          }
  
          for (int j = 0; j < i; ++j) {
              double d0 = chunkX * 16 + this.rand.nextInt(16);
              double d1 = this.rand.nextInt(this.rand.nextInt(120) + 8);
              double d2 = chunkZ * 16 + this.rand.nextInt(16);
              int k = 1;
  
              if (this.rand.nextInt(4) == 0) {
                  this.func_180703_a(this.rand.nextLong(), p_180701_4_, p_180701_5_, chunkPrimerIn, d0, d1, d2);
                  k += this.rand.nextInt(4);
              }
  
              for (int l = 0; l < k; ++l) {
                  float f = this.rand.nextFloat() * (float) Math.PI * 2.0F;
                  float f1 = (this.rand.nextFloat() - 0.5F) * 2.0F / 8.0F;
                  float f2 = this.rand.nextFloat() * 2.0F + this.rand.nextFloat();
  
                  if (this.rand.nextInt(10) == 0) {
                      f2 *= this.rand.nextFloat() * this.rand.nextFloat() * 3.0F + 1.0F;
                  }
  
                  this.func_180702_a(this.rand.nextLong(), p_180701_4_, p_180701_5_, chunkPrimerIn, d0, d1, d2, f2, f, f1, 0, 0, 1.0D);
              }
          }
      }
  }
  