AddEventCallback("post_inventory_application", function(eventTable)
    local playerNetID = eventTable.userid
    local activator = ents.GetPlayerByUserId(playerNetID)
    
    if activator.m_iClass == 9 and activator:IsRealPlayer() == true then
        local disposableSentryTotal = 0
        local disposableSentryLimit = activator:GetAttributeValueByClass("engy_disposable_sentries", 0)
        
        local buildingTable = ents.FindAllByClass("obj_*")
        for _, entity in pairs(buildingTable) do
            --print(entity.m_hBuilder)
            if entity.m_hBuilder == activator then
                --print("Max health is " .. entity.m_iMaxHealth)
                --print("Current health is " .. entity.m_iHealth)
                local entityRemainingHealthMultiplier = (entity.m_iHealth / entity.m_iMaxHealth)
                --object type is placed in a variable because it will be accessed multiple times
                local buildingObjectType = entity.m_iObjectType
                local buildingBaseHealth = 216
				--if the activator has the gunslinger mini sentry attribute, or you're a disposable building, and you're a sentry, your base health is 100
                if (activator:GetAttributeValue("mod wrench builds minisentry", true) or entity.m_bDisposableBuilding == 1) and buildingObjectType == 2 then
                    buildingBaseHealth = 100
                    if entity.m_bDisposableBuilding == 1 then
                        disposableSentryTotal = disposableSentryTotal + 1
                    end
                    
                elseif entity.m_iUpgradeLevel == 1 then
                    buildingBaseHealth = 150
                    
                elseif entity.m_iUpgradeLevel == 2 then
                    buildingBaseHealth = 180
                    
                end
                --if none of the above checks pass, we will assume that we are a level 3 building
            
                local buildingMaxHealth = activator:GetAttributeValueByClass("mult_engy_building_health", 1) * buildingBaseHealth
                --print(buildingMaxHealth)
                local damageCalibration = -1
                local sufferingTable = {
                    Attacker = nil, -- Attacker
                    Inflictor = nil, -- Direct cause of damage, usually a projectile
                    Weapon = nil,
                    Damage = damageCalibration,
                    DamageType = nil, -- Damage type, see DMG_* globals. Can be combined with | operator
                    DamageCustom = nil, -- Custom damage type, see TF_DMG_* globals
                    CritType = 0, -- Crit type, 0 = no crit, 1 = mini crit, 2 = normal crit
                    DamagePosition = nil, -- Where the target was hit at
                    DamageForce = nil, -- Knockback force of the attack
                    ReportedPosition = nil -- Where the attacker attacked from
                }
				entity.m_iMaxHealth = buildingMaxHealth
                entity.m_iHealth = buildingMaxHealth * entityRemainingHealthMultiplier
                entity:TakeDamage(sufferingTable)
                
                if disposableSentryTotal > disposableSentryLimit and entity.m_bDisposableBuilding == 1 then
                    damageCalibration = 9000
                    entity:TakeDamage(sufferingTable)
                    --print("Killed a disposable")
                end
            end
        end    
    end
    
end)