Item Drops

@Override
    public int getDropItemId() {
        if (npcIsFriend) {
            if (Math.random() < 0.25) {
                if (npcLevel <= 9) {
                    return Item.arrow.shiftedIndex;
                }
                if (npcLevel >= 10 && npcLevel <= 19) {
                    return Item.cookie.shiftedIndex;
                }
                if (npcLevel >= 20 && npcLevel <= 29) {
                    return Item.gunpowder.shiftedIndex;
                }
                if (npcLevel >= 30 && npcLevel <= 39) {
                    return Item.cake.shiftedIndex;
                }
                if (npcLevel >= 40 && npcLevel <= 49) {
                    return Block.tnt.blockID;
                }
                if (npcLevel == 50) {
                    final double rand = Math.random() * 50;
                    if (rand >= 0 && rand <= 7) {
                        return Block.blockGold.blockID;
                    }
                    if (rand >= 8 && rand <= 17) {
                        return Item.appleGold.shiftedIndex;
                    }
                    if (rand >= 18 && rand <= 27) {
                        return Item.diamond.shiftedIndex;
                    }
                    if (rand >= 28 && rand <= 37) {
                        return Block.obsidian.blockID;
                    }
                    if (rand >= 38 && rand <= 47) {
                        return Block.blockSteel.blockID;
                    }
                    if (rand >= 48 && rand <= 50) {
                        return Block.blockDiamond.blockID;
                    }
                }
            } else {
                return GenuineNpcItems.HumanBrain.shiftedIndex;
            }
        } else if (Math.random() < 0.25) {
            if (npcLevel <= 9) {
                return Item.arrow.shiftedIndex;
            }
            if (npcLevel >= 10 && npcLevel <= 19) {
                return Item.cookie.shiftedIndex;
            }
            if (npcLevel >= 20 && npcLevel <= 29) {
                return Item.gunpowder.shiftedIndex;
            }
            if (npcLevel >= 30 && npcLevel <= 39) {
                return Item.cake.shiftedIndex;
            }
            if (npcLevel >= 40 && npcLevel <= 49) {
                return Block.tnt.blockID;
            }
            if (npcLevel == 50) {
                final int rand = (int) (Math.random() * 50);
                if (rand >= 0 && rand <= 7) {
                    return Block.blockGold.blockID;
                }
                if (rand >= 8 && rand <= 17) {
                    return Item.appleGold.shiftedIndex;
                }
                if (rand >= 18 && rand <= 27) {
                    return Item.diamond.shiftedIndex;
                }
                if (rand >= 28 && rand <= 37) {
                    return Block.obsidian.blockID;
                }
                if (rand >= 38 && rand <= 47) {
                    return Block.blockSteel.blockID;
                }
                if (rand >= 48 && rand <= 50) {
                    return Block.blockDiamond.blockID;
                }
            }
        } else {
            return GenuineNpcItems.ZombieBrain.shiftedIndex;
        }
        return 0;
    }