globals 
  constant real SCG_DELAY = 5.0 
  constant real SCG_UPDATE_TIMEOUT = 0.1

  constant integer CORPSE_GAS = 'A600'

  unit array SCGCasters
  real array SCGDuration
  effect array SCGEffects
  integer array SCGLevel
  texttag array SCGIndicators
  unit array SCGTargets

  group SCGVictims
  integer SCGTargetsQuantity
endglobals 

function SCGOnExplosionCallback takes nothing returns nothing 
endfunction 

function spellCorpseGas takes unit c, unit t, integer lvl returns nothing
  local integer i = SCGTargetsQuantity
  local texttag indicator = null

  if (i >= JASS_MAX_ARRAY_SIZE) or (null == c) or (null == t) or (lvl < 1) then
    return
  endif


  set SCGCasters[i] = c
  set SCGEffects[i] = AddSpecialEffectTarget("Abilities\\Spells\\NightElf\\TargetArtLumber\\TargetArtLumber.mdl", t, "origin")
  set SCGTargets[i] = t
  set SCGDuration[i] = SCG_DELAY
  set indicator = CreateTextTagUnitBJ(I2S(R2I(SCG_DELAY)), t, 0.0, 8.0, 100.0, 100.0, 100.0, 0)
  set SCGIndicators[i] = indicator
  set SCGLevel[i] = lvl
  set SCGTargetsQuantity = SCGTargetsQuantity + 1
endfunction 

function SCGOnCastCallback takes nothing returns nothing 
  local unit caster = GetSpellAbilityUnit() 

  local integer spellLevel = GetUnitAbilityLevel(caster, CORPSE_GAS) 

  call spellCorpseGas(caster, GetSpellTargetUnit(), spellLevel) 

  set caster = null 
endfunction 

function SCGUpdateCallback takes nothing returns nothing 
  local integer i = SCGTargetsQuantity
  local unit u = null
  local unit f = null
  local boolean mustBeDestroyed = false
  local real dmg = 0.0

  loop 
    exitwhen i <= 0
    set i = i - 1
    set u = SCGTargets[i] 
    if IsUnitAliveBJ(u) then
      /* update visuals */
      set SCGDuration[i] = SCGDuration[i] - SCG_UPDATE_TIMEOUT
      call SetTextTagTextBJ(SCGIndicators[i], I2S(R2I(SCGDuration[i])), 8.0)
      call SetTextTagPosUnitBJ(SCGIndicators[i], SCGTargets[i], 0.0)
      if SCGDuration[i] <= 2.0 then
        call SetTextTagColorBJ(SCGIndicators[i], 100.0, 0.0, 0.0, 0.0)
      endif
      /* end update visuals */

      /* explode when needed */
      if SCGDuration[i] <= 0.0 then 
	call GroupClear(SCGVictims)
	call GroupEnumUnitsInRangeCounted(SCGVictims, GetUnitX(u), GetUnitY(u), 512.0, null, 6)

	set dmg = (30.0 + 30.0 * I2R(SCGLevel[i])) * (GetUnitState(SCGTargets[i], UNIT_STATE_LIFE) / 300.0)

        call SetUnitExploded(SCGTargets[i], true)
        call UnitDamageTargetBJ(SCGCasters[i], SCGTargets[i], 300.0, ATTACK_TYPE_MAGIC, DAMAGE_TYPE_DISEASE)
	call SetUnitExploded(SCGTargets[i], false)

	call DestroyEffect(AddSpecialEffectTarget("Abilities\\Spells\\Undead\\DeathCoil\\DeathCoilSpecialArt.mdl", SCGTargets[i], "origin"))
	loop
	  set f = FirstOfGroup(SCGVictims)
	  exitwhen null == f
	  if not IsUnitType(f, UNIT_TYPE_UNDEAD) and IsUnitAliveBJ(f) and GetUnitAbilityLevel(f, 'Avul') == 0 then
	    call UnitDamageTargetBJ(SCGCasters[i], f, dmg, ATTACK_TYPE_MAGIC, DAMAGE_TYPE_DISEASE)
	    if dmg > 60.0 then
	      call DestroyEffect(AddSpecialEffectTarget("Abilities\\Spells\\Undead\\DeathCoil\\DeathCoilSpecialArt.mdl", f, "origin"))
	    endif
	  endif
	  call GroupRemoveUnit(SCGVictims, f)
	endloop
      endif 
      /* end explode if needed */
    endif 

    /* cleanup */
    set mustBeDestroyed = IsUnitDeadBJ(u) or SCGDuration[i] <= 0.0
    if mustBeDestroyed then 
      call DestroyTextTag(SCGIndicators[i])
      call DestroyEffect(SCGEffects[i])

      set SCGTargetsQuantity = SCGTargetsQuantity - 1

      set SCGCasters[i] = SCGCasters[SCGTargetsQuantity]
      set SCGDuration[i] = SCGDuration[SCGTargetsQuantity]
      set SCGEffects[i] = SCGEffects[SCGTargetsQuantity]
      set SCGIndicators[i] = SCGIndicators[SCGTargetsQuantity]
      set SCGLevel[i] = SCGLevel[SCGTargetsQuantity]
      set SCGTargets[i] = SCGTargets[SCGTargetsQuantity] 

      set SCGCasters[SCGTargetsQuantity] = null
      set SCGEffects[SCGTargetsQuantity] = null
      set SCGIndicators[SCGTargetsQuantity] = null
      set SCGTargets[SCGTargetsQuantity] = null 
    endif 
    /* end cleanup */
  endloop 

  set u = null 
  set f = null
endfunction 

function SCGOnCastFilter takes nothing returns boolean
  local boolean result = true 
  set result = CORPSE_GAS == GetSpellAbilityId() and result
  set result = GetSpellTargetUnit() != null and result
  set result = IsUnitType(GetSpellTargetUnit(), UNIT_TYPE_UNDEAD) and result
  return result
endfunction

function initSpellCorpseGas takes nothing returns nothing 
  local trigger t = CreateTrigger() 
  local timer updateTimer = CreateTimer()

  set SCGTargetsQuantity = 0
  set SCGVictims = CreateGroup()

  call TimerStart(updateTimer, SCG_UPDATE_TIMEOUT, true, function SCGUpdateCallback) 

  call TriggerRegisterAnyUnitEventBJ(t, EVENT_PLAYER_UNIT_SPELL_CAST)
  call TriggerAddCondition(t, Condition(function SCGOnCastFilter))	
  call TriggerAddAction(t, function SCGOnCastCallback) 
 
  set t = null 
endfunction