function WhiteRing_Conditions takes nothing returns boolean
    return (GetItemTypeId(GetManipulatedItem())=='I030' or GetItemTypeId(GetManipulatedItem())=='I02F') and (UnitHasItemOfTypeBJ(GetManipulatingUnit(),'I02F') and UnitHasItemOfTypeBJ(GetManipulatingUnit(),'I030'))
endfunction

function WhiteRing_Actions takes nothing returns nothing
    call RemoveItem(GetItemOfTypeFromUnitBJ(GetManipulatingUnit(),'I02F'))
    call RemoveItem(GetItemOfTypeFromUnitBJ(GetManipulatingUnit(),'I030'))
    call UnitAddItemById(GetManipulatingUnit(),'I02V')
    if IsUnitAlly(GetTriggerUnit(),Player(10)) then
        call DestroyEffect(AddSpecialEffectTarget("Abilities\\Spells\\Human\\HolyBolt\\HolyBoltSpecialArt.md​l",GetManipulatingUnit(),"origin"))
    else
        call DestroyEffect(AddSpecialEffectTarget("Objects\\Spawnmodels\\Naga\\NagaDeath\\NagaDeath.mdl"​;,GetManipulatingUnit(),"origin"))
    endif
endfunction

//===========================================================================
function InitTrig_WhiteRing takes nothing returns nothing
    local trigger WhiteRing = CreateTrigger()
    call TriggerRegisterAnyUnitEventBJ(WhiteRing,EVENT_PLAYER_UNIT_PICKUP_ITEM)
    call TriggerAddCondition(WhiteRing,Condition(function WhiteRing_Conditions))
    call TriggerAddAction(WhiteRing,function WhiteRing_Actions)
    set WhiteRing = null
endfunction

function GetItemOfTypeFromUnitBJ takes unit whichUnit, integer itemId returns item
    local integer index = GetInventoryIndexOfItemTypeBJ(whichUnit, itemId)

    if (index == 0) then
        return null
    else
        return UnitItemInSlot(whichUnit, index - 1)
    endif
endfunction

function GetInventoryIndexOfItemTypeBJ takes unit whichUnit, integer itemId returns integer
    local integer index
    local item    indexItem

    set index = 0
    loop
        set indexItem = UnitItemInSlot(whichUnit, index)
        if (indexItem != null) and (GetItemTypeId(indexItem) == itemId) then
            return index + 1
        endif

        set index = index + 1
        exitwhen index >= bj_MAX_INVENTORY
    endloop
    return 0
endfunction

// вариант 1
function UnitItemInSlot takes unit u, integer id returns integer
  local integer i = 0
  loop
    if GetItemTypeId(UnitItemInSlot(u, i)) == id then
      return i
    endif
    set i = i + 1
    exitwhen i > 5
  endloop
  return 0
endfunction

// вариант 2
function UnitItemInSlot takes unit u, integer id returns integer
  if GetItemTypeId(UnitItemInSlot(u, 0)) == id then
    return 0
  elseif GetItemTypeId(UnitItemInSlot(u, 1)) == id then
    return 1
  elseif GetItemTypeId(UnitItemInSlot(u, 2)) == id then
    return 2
  elseif GetItemTypeId(UnitItemInSlot(u, 3)) == id then
    return 3
  elseif GetItemTypeId(UnitItemInSlot(u, 4)) == id then
    return 4
  elseif GetItemTypeId(UnitItemInSlot(u, 5)) == id then
    return 5
  endif
  return 0
endfunction