Solved How to calculate damage if the entity is wearing armor?

Hey there, I'm making a plugin where I want to make it so that players can fight each other at a distance (like a super-powers plugin).
I can get the attack damage of the item the player is holding, and then apply that damage to the opponent, but what if the opponent was wearing armor? And then what if the armor had protection or thorns? I need to know how I'd set up the calculations for the damage the player would then cause to the opponent.

Here's the code I'm using for the reach:

Code:

    @EventHandler
    public void onAttack(PlayerInteractEvent e) {
       
        Player player = e.getPlayer();
       
        if(e.getAction().equals(Action.LEFT_CLICK_AIR) && player.hasPermission("distanceAttacks")) {
           
            Location start = player.getEyeLocation();
            Vector dir = player.getLocation().getDirection();
           
            for (double i = 0; i < 10; i += 0.2) {
               
                start.add(dir.getX() * i, dir.getY() * i, dir.getZ() * i);
                   
                if(start.getBlock().getType() != Material.AIR || start.getBlock().getType() != Material.YELLOW_FLOWER || start.getBlock().getType() != Material.LONG_GRASS) break;
                   
                for(Entity entity : player.getWorld().getNearbyEntities(start, 0.1, 0.1, 0.1)) {
                   
                    if(entity instanceof Damageable) {
                       
                        ((Damageable) entity).damage(getAttackDamage(player.getItemInHand()));
                       
                    }
                   
                    break;
                   
                }
               
                start.subtract(dir);
                dir.normalize();
               
            }
           
        }
       
    }

Here's the code I'm using to get the held weapon's attack damage (I didn't write this part):

Code:

    public double getAttackDamage(ItemStack itemStack) {
       
        double attackDamage = 1.0;
       
        UUID uuid = UUID.fromString("CB3F55D3-645C-4F38-A497-9C13A33DB5CF");
       
        net.minecraft.server.v1_9_R1.ItemStack craftItemStack = CraftItemStack.asNMSCopy(itemStack);
        net.minecraft.server.v1_9_R1.Item item = craftItemStack.getItem();
       
        if(item instanceof net.minecraft.server.v1_9_R1.ItemSword || item instanceof net.minecraft.server.v1_9_R1.ItemTool || item instanceof net.minecraft.server.v1_9_R1.ItemHoe) {
           
            Multimap<String, AttributeModifier> map = item.a(EnumItemSlot.MAINHAND);
           
            Collection<AttributeModifier> attributes = map.get(GenericAttributes.ATTACK_DAMAGE.getName());
                    if(am.a().toString().equalsIgnoreCase(uuid.toString()) && am.c() == 0) attackDamage += am.d();
                   
                }
               
                double y = 1;
               
                for(AttributeModifier am: attributes) {
                   
                    if(am.a().toString().equalsIgnoreCase(uuid.toString()) && am.c() == 1) y += am.d();
                   
                }
               
                attackDamage *= y;
               
                for(AttributeModifier am: attributes) {
                   
                    if(am.a().toString().equalsIgnoreCase(uuid.toString()) && am.c() == 2) attackDamage *= (1 + am.d());
                   
                }
               
            }
           
        }
       
        return attackDamage;
       
    }

 

@MrShnig
https://minecraft.gamepedia.com/Armor#Damage_protection
Use this damage formula to get the damage change.

https://minecraft.gamepedia.com/Enchanting#Thorns

 

Is there not a code snippet somebody already created for this?

 

I used information from this thread: https://www.spigotmc.org/threads/get-armor-defense-points-from-a-player.153971/
to complete the task. Thanks for taking your time to reply, though. //Solved