content: package net.minecraft.world.gen.feature;
  
  import net.minecraft.block.*;
  import net.minecraft.block.material.Material;
  import net.minecraft.block.properties.PropertyBool;
  import net.minecraft.block.state.IBlockState;
  import net.minecraft.init.Blocks;
  import net.minecraft.util.BlockPos;
  import net.minecraft.util.EnumFacing;
  import net.minecraft.world.World;
  
  import java.util.Random;
  
  public class WorldGenTrees extends WorldGenAbstractTree {
      private static final IBlockState field_181653_a = Blocks.log.getDefaultState().withProperty(BlockOldLog.VARIANT, BlockPlanks.EnumType.OAK);
      private static final IBlockState field_181654_b = Blocks.leaves.getDefaultState().withProperty(BlockOldLeaf.VARIANT, BlockPlanks.EnumType.OAK).withProperty(BlockLeaves.CHECK_DECAY, false);
      private final int minTreeHeight;
      private final boolean vinesGrow;
      private final IBlockState metaWood;
      private final IBlockState metaLeaves;
  
      public WorldGenTrees(boolean p_i2027_1_) {
          this(p_i2027_1_, 4, field_181653_a, field_181654_b, false);
      }
  
      public WorldGenTrees(boolean p_i46446_1_, int p_i46446_2_, IBlockState p_i46446_3_, IBlockState p_i46446_4_, boolean p_i46446_5_) {
          super(p_i46446_1_);
          this.minTreeHeight = p_i46446_2_;
          this.metaWood = p_i46446_3_;
          this.metaLeaves = p_i46446_4_;
          this.vinesGrow = p_i46446_5_;
      }
  
      public boolean generate(World worldIn, Random rand, BlockPos position) {
          int i = rand.nextInt(3) + this.minTreeHeight;
          boolean flag = true;
  
          if (position.getY() >= 1 && position.getY() + i + 1 <= 256) {
              for (int j = position.getY(); j <= position.getY() + 1 + i; ++j) {
                  int k = 1;
  
                  if (j == position.getY()) {
                      k = 0;
                  }
  
                  if (j >= position.getY() + 1 + i - 2) {
                      k = 2;
                  }
  
                  BlockPos.MutableBlockPos blockpos$mutableblockpos = new BlockPos.MutableBlockPos();
  
                  for (int l = position.getX() - k; l <= position.getX() + k && flag; ++l) {
                      for (int i1 = position.getZ() - k; i1 <= position.getZ() + k && flag; ++i1) {
                          if (j >= 0 && j < 256) {
                              if (!this.func_150523_a(worldIn.getBlockState(blockpos$mutableblockpos.set(l, j, i1)).getBlock())) {
                                  flag = false;
                              }
                          } else {
                              flag = false;
                          }
                      }
                  }
              }
  
              if (!flag) {
                  return false;
              } else {
                  Block block1 = worldIn.getBlockState(position.down()).getBlock();
  
                  if ((block1 == Blocks.grass || block1 == Blocks.dirt || block1 == Blocks.farmland) && position.getY() < 256 - i - 1) {
                      this.func_175921_a(worldIn, position.down());
                      int k2 = 3;
                      int l2 = 0;
  
                      for (int i3 = position.getY() - k2 + i; i3 <= position.getY() + i; ++i3) {
                          int i4 = i3 - (position.getY() + i);
                          int j1 = l2 + 1 - i4 / 2;
  
                          for (int k1 = position.getX() - j1; k1 <= position.getX() + j1; ++k1) {
                              int l1 = k1 - position.getX();
  
                              for (int i2 = position.getZ() - j1; i2 <= position.getZ() + j1; ++i2) {
                                  int j2 = i2 - position.getZ();
  
                                  if (Math.abs(l1) != j1 || Math.abs(j2) != j1 || rand.nextInt(2) != 0 && i4 != 0) {
                                      BlockPos blockpos = new BlockPos(k1, i3, i2);
                                      Block block = worldIn.getBlockState(blockpos).getBlock();
  
                                      if (block.getMaterial() == Material.air || block.getMaterial() == Material.leaves || block.getMaterial() == Material.vine) {
                                          this.setBlockAndNotifyAdequately(worldIn, blockpos, this.metaLeaves);
                                      }
                                  }
                              }
                          }
                      }
  
                      for (int j3 = 0; j3 < i; ++j3) {
                          Block block2 = worldIn.getBlockState(position.up(j3)).getBlock();
  
                          if (block2.getMaterial() == Material.air || block2.getMaterial() == Material.leaves || block2.getMaterial() == Material.vine) {
                              this.setBlockAndNotifyAdequately(worldIn, position.up(j3), this.metaWood);
  
                              if (this.vinesGrow && j3 > 0) {
                                  if (rand.nextInt(3) > 0 && worldIn.isAirBlock(position.add(-1, j3, 0))) {
                                      this.func_181651_a(worldIn, position.add(-1, j3, 0), BlockVine.EAST);
                                  }
  
                                  if (rand.nextInt(3) > 0 && worldIn.isAirBlock(position.add(1, j3, 0))) {
                                      this.func_181651_a(worldIn, position.add(1, j3, 0), BlockVine.WEST);
                                  }
  
                                  if (rand.nextInt(3) > 0 && worldIn.isAirBlock(position.add(0, j3, -1))) {
                                      this.func_181651_a(worldIn, position.add(0, j3, -1), BlockVine.SOUTH);
                                  }
  
                                  if (rand.nextInt(3) > 0 && worldIn.isAirBlock(position.add(0, j3, 1))) {
                                      this.func_181651_a(worldIn, position.add(0, j3, 1), BlockVine.NORTH);
                                  }
                              }
                          }
                      }
  
                      if (this.vinesGrow) {
                          for (int k3 = position.getY() - 3 + i; k3 <= position.getY() + i; ++k3) {
                              int j4 = k3 - (position.getY() + i);
                              int k4 = 2 - j4 / 2;
                              BlockPos.MutableBlockPos blockpos$mutableblockpos1 = new BlockPos.MutableBlockPos();
  
                              for (int l4 = position.getX() - k4; l4 <= position.getX() + k4; ++l4) {
                                  for (int i5 = position.getZ() - k4; i5 <= position.getZ() + k4; ++i5) {
                                      blockpos$mutableblockpos1.set(l4, k3, i5);
  
                                      if (worldIn.getBlockState(blockpos$mutableblockpos1).getBlock().getMaterial() == Material.leaves) {
                                          BlockPos blockpos2 = blockpos$mutableblockpos1.west();
                                          BlockPos blockpos3 = blockpos$mutableblockpos1.east();
                                          BlockPos blockpos4 = blockpos$mutableblockpos1.north();
                                          BlockPos blockpos1 = blockpos$mutableblockpos1.south();
  
                                          if (rand.nextInt(4) == 0 && worldIn.getBlockState(blockpos2).getBlock().getMaterial() == Material.air) {
                                              this.func_181650_b(worldIn, blockpos2, BlockVine.EAST);
                                          }
  
                                          if (rand.nextInt(4) == 0 && worldIn.getBlockState(blockpos3).getBlock().getMaterial() == Material.air) {
                                              this.func_181650_b(worldIn, blockpos3, BlockVine.WEST);
                                          }
  
                                          if (rand.nextInt(4) == 0 && worldIn.getBlockState(blockpos4).getBlock().getMaterial() == Material.air) {
                                              this.func_181650_b(worldIn, blockpos4, BlockVine.SOUTH);
                                          }
  
                                          if (rand.nextInt(4) == 0 && worldIn.getBlockState(blockpos1).getBlock().getMaterial() == Material.air) {
                                              this.func_181650_b(worldIn, blockpos1, BlockVine.NORTH);
                                          }
                                      }
                                  }
                              }
                          }
  
                          if (rand.nextInt(5) == 0 && i > 5) {
                              for (int l3 = 0; l3 < 2; ++l3) {
                                  for (EnumFacing enumfacing : EnumFacing.Plane.HORIZONTAL) {
                                      if (rand.nextInt(4 - l3) == 0) {
                                          EnumFacing enumfacing1 = enumfacing.getOpposite();
                                          this.func_181652_a(worldIn, rand.nextInt(3), position.add(enumfacing1.getFrontOffsetX(), i - 5 + l3, enumfacing1.getFrontOffsetZ()), enumfacing);
                                      }
                                  }
                              }
                          }
                      }
  
                      return true;
                  } else {
                      return false;
                  }
              }
          } else {
              return false;
          }
      }
  
      private void func_181652_a(World p_181652_1_, int p_181652_2_, BlockPos p_181652_3_, EnumFacing p_181652_4_) {
          this.setBlockAndNotifyAdequately(p_181652_1_, p_181652_3_, Blocks.cocoa.getDefaultState().withProperty(BlockCocoa.AGE, Integer.valueOf(p_181652_2_)).withProperty(BlockCocoa.FACING, p_181652_4_));
      }
  
      private void func_181651_a(World p_181651_1_, BlockPos p_181651_2_, PropertyBool p_181651_3_) {
          this.setBlockAndNotifyAdequately(p_181651_1_, p_181651_2_, Blocks.vine.getDefaultState().withProperty(p_181651_3_, true));
      }
  
      private void func_181650_b(World p_181650_1_, BlockPos p_181650_2_, PropertyBool p_181650_3_) {
          this.func_181651_a(p_181650_1_, p_181650_2_, p_181650_3_);
          int i = 4;
  
          for (p_181650_2_ = p_181650_2_.down(); p_181650_1_.getBlockState(p_181650_2_).getBlock().getMaterial() == Material.air && i > 0; --i) {
              this.func_181651_a(p_181650_1_, p_181650_2_, p_181650_3_);
              p_181650_2_ = p_181650_2_.down();
          }
      }
  }
  