pfUI/libs/libdebuff.lua

-- load pfUI environment
setfenv(1, pfUI:GetEnvironment())

--[[ libdebuff - GetUnitField Edition ]]--
-- A pfUI library that detects and saves all ongoing debuffs of players, NPCs and enemies.
-- 
-- MAJOR REWRITE: Now uses GetUnitField for slot mapping instead of manual shifting.
-- Key insight: GetUnitField returns STABLE aura slots (33-48) that DON'T shift when 
-- debuffs expire. Only the display slots (UnitDebuff returns 1,2,3...) are compacted.
--
-- This eliminates ~400 lines of error-prone shift logic while maintaining full
-- multi-caster tracking support.
--
-- The public per-aura readers (UnitDebuff, UnitOwnDebuff) were retired in favor
-- of ClassicAPI's C_UnitAuras (which now provides sourceUnit/sourceGUID and
-- non-player expirationTime). What remains in libdebuff is the cast-event
-- bookkeeping consumed by GetBestAuraCast (libpredict HoT tracking) and the
-- libdebuff_*_hooks broadcast surface (subscribers in actionbar / swingtimer
-- react to SPELL_GO and SPELL_FAILED).

-- return instantly when another libdebuff is already active
if pfUI.api.libdebuff then return end

-- fix a typo (missing $) in ruRU capture index
if GetLocale() == "ruRU" then
  SPELLREFLECTSELFOTHER = gsub(SPELLREFLECTSELFOTHER, "%%2s", "%%2%$s")
end

local libdebuff = CreateFrame("Frame", "pfdebuffsScanner", UIParent)
local _, class = UnitClass("player")
local lastspell

-- Nampower Support
local hasNampower = false

-- Set hasNampower immediately for functionality
if GetNampowerVersion then
  local major, minor, patch = GetNampowerVersion()
  patch = patch or 0
  -- Minimum required version: 3.0.0 (UnitGUID support)
  if major > 3 or (major == 3 and minor > 0) or (major == 3 and minor == 0 and patch >= 0) then
    hasNampower = true
  end
end

EventUtil.ContinueOnPlayerLogin(function()
  RunNextFrame(function()

    if GetNampowerVersion then
      local major, minor, patch = GetNampowerVersion()
      patch = patch or 0
      local versionString = major .. "." .. minor .. "." .. patch

      if major > 3 or (major == 3 and minor > 0) or (major == 3 and minor == 0 and patch >= 0) then
        if SetCVar and GetCVar then
          local cvarsToEnable = {
            "NP_EnableSpellStartEvents",
            "NP_EnableSpellGoEvents",
            "NP_EnableAuraCastEvents",
            "NP_EnableAutoAttackEvents",
            "NP_EnableSpellHealEvents", 
          }
          local enabledCount = 0
          local alreadyEnabledCount = 0
          local failedCount = 0

          for _, cvar in ipairs(cvarsToEnable) do
            local success, currentValue = pcall(GetCVar, cvar)
            if success and currentValue then
              if currentValue == "1" then
                alreadyEnabledCount = alreadyEnabledCount + 1
              else
                local setSuccess = pcall(SetCVar, cvar, "1")
                if setSuccess then enabledCount = enabledCount + 1
                else failedCount = failedCount + 1 end
              end
            else
              failedCount = failedCount + 1
            end
          end

          if enabledCount > 0 then
            DEFAULT_CHAT_FRAME:AddMessage("|cff33ff99[libdebuff]|r Enabled " .. enabledCount .. " Nampower CVars")
          end
          if failedCount > 0 then
            DEFAULT_CHAT_FRAME:AddMessage("|cffffcc00[libdebuff]|r Warning: Could not check/set " .. failedCount .. " CVars")
          end
        end

      else
        DEFAULT_CHAT_FRAME:AddMessage("|cffff0000[libdebuff] Debuff tracking disabled! Please update Nampower to v3.0.0 or higher.|r")
        StaticPopup_Show("LIBDEBUFF_NAMPOWER_UPDATE", versionString)
      end
    else
      DEFAULT_CHAT_FRAME:AddMessage("|cffff0000[libdebuff] Nampower not found! Debuff tracking disabled.|r")
      StaticPopup_Show("LIBDEBUFF_NAMPOWER_MISSING")
    end
  end)
end)

-- ============================================================================
-- DATA STRUCTURES (Simplified - no more manual slot tracking!)
-- ============================================================================

-- ownDebuffs: [targetGUID][spellName] = {startTime, duration, texture, rank}
-- Timer data for OUR debuffs only
pfUI.libdebuff_own = pfUI.libdebuff_own or {}
local ownDebuffs = pfUI.libdebuff_own

-- allAuraCasts: [targetGUID][spellName][casterGuid] = {startTime, duration, rank}
-- Timer data for ALL debuffs (multi-caster support)
pfUI.libdebuff_all_auras = pfUI.libdebuff_all_auras or {}
local allAuraCasts = pfUI.libdebuff_all_auras

-- slotOwnership: [targetGUID][auraSlot] = {casterGuid, spellName, spellId}
-- Maps REAL aura slots (33-48) to caster info - NO SHIFTING NEEDED!
pfUI.libdebuff_slot_ownership = pfUI.libdebuff_slot_ownership or {}
local slotOwnership = pfUI.libdebuff_slot_ownership

-- displayToAura: [targetGUID][displaySlot] = auraSlot
-- Maps DISPLAY slots (1-16) to REAL aura slots (33-48) for DEBUFF_REMOVED correlation
pfUI.libdebuff_display_to_aura = pfUI.libdebuff_display_to_aura or {}
local displayToAura = pfUI.libdebuff_display_to_aura

-- pendingCasts: [targetGUID][spellName] = {casterGuid, rank, time}
-- Temporary storage from SPELL_GO to correlate with DEBUFF_ADDED
pfUI.libdebuff_pending = pfUI.libdebuff_pending or {}
local pendingCasts = pfUI.libdebuff_pending

-- Spell Icon Cache: [spellId] = texture
pfUI.libdebuff_icon_cache = pfUI.libdebuff_icon_cache or {}
local iconCache = pfUI.libdebuff_icon_cache

-- Cast Tracking: [casterGuid] = {spellID, spellName, icon, startTime, duration, endTime}
-- Shared with nameplates for cast-bar display

-- Cleveroids API: [targetGUID][spellID] = {start, duration, caster, stacks}
pfUI.libdebuff_objects_guid = pfUI.libdebuff_objects_guid or {}
local objectsByGuid = pfUI.libdebuff_objects_guid

-- LEGACY: Keep these for backwards compatibility (external modules might check them)
pfUI.libdebuff_own_slots = pfUI.libdebuff_own_slots or {}
pfUI.libdebuff_all_slots = pfUI.libdebuff_all_slots or {}

-- Deduplication: Track recent AURA_CAST events to ignore duplicates
-- [targetGuid][spellName][casterGuid] = timestamp
pfUI.libdebuff_recent_casts = pfUI.libdebuff_recent_casts or {}
local recentCasts = pfUI.libdebuff_recent_casts

-- Callbacks fired after SPELL_GO_SELF is processed: fn(spellId, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
pfUI.libdebuff_spell_go_hooks = pfUI.libdebuff_spell_go_hooks or {}

-- Callbacks fired after SPELL_GO_OTHER is processed: fn(spellId, casterGuid, targetGuid)
pfUI.libdebuff_spell_go_other_hooks = pfUI.libdebuff_spell_go_other_hooks or {}

-- Callbacks fired after SPELL_START_SELF is processed: fn(spellId, casterGuid, targetGuid, castTime)
pfUI.libdebuff_spell_start_self_hooks = pfUI.libdebuff_spell_start_self_hooks or {}

-- Callbacks fired after SPELL_START_OTHER is processed: fn(spellId, casterGuid, targetGuid, castTime)
pfUI.libdebuff_spell_start_other_hooks = pfUI.libdebuff_spell_start_other_hooks or {}

-- Callbacks fired after SPELL_FAILED_OTHER is processed: fn(casterGuid, spellId)
pfUI.libdebuff_spell_failed_other_hooks = pfUI.libdebuff_spell_failed_other_hooks or {}

-- Callbacks fired after AURA_CAST_ON_SELF is processed: fn(spellId, casterGuid, targetGuid)
pfUI.libdebuff_aura_cast_on_self_hooks = pfUI.libdebuff_aura_cast_on_self_hooks or {}

-- Callbacks fired after AURA_CAST_ON_OTHER is processed: fn(spellId, casterGuid, targetGuid)
pfUI.libdebuff_aura_cast_on_other_hooks = pfUI.libdebuff_aura_cast_on_other_hooks or {}

-- Callbacks fired after DEBUFF_ADDED_OTHER is processed: fn(guid, luaSlot, spellId, stackCount)
pfUI.libdebuff_debuff_added_other_hooks = pfUI.libdebuff_debuff_added_other_hooks or {}

-- Callbacks fired after DEBUFF_REMOVED_OTHER is processed: fn(guid, luaSlot, spellId, stackCount)
pfUI.libdebuff_debuff_removed_other_hooks = pfUI.libdebuff_debuff_removed_other_hooks or {}

-- Callbacks fired after UNIT_HEALTH is processed: fn(unitToken)
pfUI.libdebuff_unit_health_hooks = pfUI.libdebuff_unit_health_hooks or {}

-- Callbacks fired after PLAYER_TARGET_CHANGED is processed: fn()
pfUI.libdebuff_player_target_changed_hooks = pfUI.libdebuff_player_target_changed_hooks or {}

-- Callbacks fired after UNIT_DIED is processed: fn(guid)
pfUI.libdebuff_unit_died_hooks = pfUI.libdebuff_unit_died_hooks or {}

-- Callbacks fired after SPELL_CAST_EVENT is processed: fn(success, spellId, castType, targetGuid)
pfUI.libdebuff_spell_cast_hooks = pfUI.libdebuff_spell_cast_hooks or {}

-- Callbacks fired when a cast is identified as a downrank of an already active debuff.
-- fn(spellName, castRank, activeRank, targetGuid, casterGuid)
-- External addons can use this to avoid re-implementing downrank detection themselves.
pfUI.libdebuff_downrank_blocked_hooks = pfUI.libdebuff_downrank_blocked_hooks or {}
local AURA_CAST_DEDUPE_WINDOW = 0.1  -- Ignore duplicates within 100ms

-- Pending cast info for libpredict (heal prediction target tracking)
-- SPELL_CAST_EVENT fires with targetGuid BEFORE SPELLCAST_START,
-- which allows libpredict to know the correct target for queued casts.
-- Fields: { spellId, spellName, targetGuid, time }
pfUI.libpredict_pending_cast = pfUI.libpredict_pending_cast or {}

-- ============================================================================
-- STATIC POPUP DIALOGS
-- ============================================================================

local function CopyNampowerLink()
  pfUI.chat.urlcopy.CopyText("https://github.com/brues-code/nampower")
end

StaticPopupDialogs["LIBDEBUFF_NAMPOWER_UPDATE"] = {
  text = "|cffff0000!!!WARNING!!!|r\n\nNampower Update Required!\n\nYour current version: %s\nRequired version: 3.0.0+\n\nPlease update Nampower to continue using pfUI!",
  button1 = "Show Download",
  button2 = "Dismiss",
  timeout = 0,
  whileDead = 1,
  hideOnEscape = 0,
  preferredIndex = 3,
  OnAccept = CopyNampowerLink,
}

StaticPopupDialogs["LIBDEBUFF_NAMPOWER_MISSING"] = {
  text = "|cffff0000!!!WARNING!!!|r\n\nNampower Not Found!\n\nNampower 3.0.0+ is required for pfUI to function correctly.\n\nPlease install Nampower!",
  button1 = "Show Download",
  button2 = "Dismiss",
  timeout = 0,
  whileDead = 1,
  hideOnEscape = 0,
  preferredIndex = 3,
  OnAccept = CopyNampowerLink,
}

-- ============================================================================
-- SPELL DATA TABLES
-- ============================================================================

-- Debuffs that only ONE player can have on target (overwrites other casters)
local selfOverwriteDebuffs = {
  ["Faerie Fire"] = true,
  ["Faerie Fire (Feral)"] = true,
  ["Demoralizing Shout"] = true,
  ["Demoralizing Roar"] = true,
  ["Hunter's Mark"] = true,
  ["Sunder Armor"] = true,
  ["Thunder Clap"] = true,
  ["Expose Armor"] = true,
  ["Curse of Weakness"] = true,
  ["Curse of Recklessness"] = true,
  ["Curse of the Elements"] = true,
  ["Curse of Shadow"] = true,
  ["Curse of Tongues"] = true,
  ["Curse of Exhaustion"] = true,
  ["Judgement of Wisdom"] = true,
  ["Judgement of Light"] = true,
  ["Judgement of the Crusader"] = true,
  ["Judgement of Justice"] = true,
  ["Shadow Weaving"] = true,
  ["Winter's Chill"] = true,
}

-- Debuff pairs that overwrite each other
local debuffOverwritePairs = {
  ["Faerie Fire"] = "Faerie Fire (Feral)",
  ["Faerie Fire (Feral)"] = "Faerie Fire",
  ["Demoralizing Shout"] = "Demoralizing Roar",
  ["Demoralizing Roar"] = "Demoralizing Shout",
}

-- ============================================================================
-- HELPER FUNCTIONS
-- ============================================================================

-- Debug Stats
pfUI.libdebuff_debugstats = pfUI.libdebuff_debugstats or {
  enabled = false,
  trackAllUnits = false,
  aura_cast = 0,
  debuff_added = 0,
  debuff_removed = 0,
  getunitfield_calls = 0,
}
local debugStats = pfUI.libdebuff_debugstats

local function DebugGuid(guid)
  if not guid then return "nil" end
  local str = tostring(guid)
  if string.len(str) > 4 then
    return string.sub(str, -4)
  end
  return str
end

local function IsCurrentTarget(guid)
  if debugStats.trackAllUnits then return true end
  if not guid or not UnitGUID then return false end
  local targetGuid = UnitGUID("target")
  return targetGuid == guid
end

local function GetDebugTimestamp()
  return string.format("[%.3f]", GetTime())
end

-- Speichert die Ranks der zuletzt gecasteten Spells
pfUI.libdebuff_lastranks = pfUI.libdebuff_lastranks or {}
local lastCastRanks = pfUI.libdebuff_lastranks

-- Speichert Spells die gefailed sind
pfUI.libdebuff_lastfailed = pfUI.libdebuff_lastfailed or {}
local lastFailedSpells = pfUI.libdebuff_lastfailed

-- Get spell icon texture (with caching)
function libdebuff:GetSpellIcon(spellId)
  if not spellId or type(spellId) ~= "number" or spellId <= 0 then
    return "Interface\\Icons\\INV_Misc_QuestionMark"
  end
  
  if iconCache[spellId] then
    return iconCache[spellId]
  end

  local texture = C_Spell.GetSpellTexture(spellId) or "Interface\\Icons\\INV_Misc_QuestionMark"
  iconCache[spellId] = texture
  return texture
end

pfUI.libdebuff_GetSpellIcon = function(spellId)
  return libdebuff:GetSpellIcon(spellId)
end

function libdebuff:DidSpellFail(spell)
  if not spell then return false end
  local data = lastFailedSpells[spell]
  if data and (GetTime() - data.time) < 1 then
    return true
  end
  return false
end

-- ============================================================================
-- CORE: GetUnitField-based Slot Mapping (THE KEY INNOVATION!)
-- ============================================================================

-- Dispel type mapping: SpellRec.dispel index -> Blizzard DebuffTypeColor key
local dispelTypeMap = {
  [1] = "Magic",
  [2] = "Curse",
  [3] = "Disease",
  [4] = "Poison",
}

-- Get current debuff state directly from WoW via GetUnitField
-- Returns: { [displaySlot] = {auraSlot, spellId, spellName, stacks, texture, dtype} }
local function GetDebuffSlotMap(guid)
  if not guid or not GetUnitField then
    return nil
  end

  local auras = GetUnitField(guid, "aura")
  if not auras then return nil end

  local auraApps = GetUnitField(guid, "auraApplications")

  if debugStats.enabled then
    debugStats.getunitfield_calls = debugStats.getunitfield_calls + 1
  end

  local map = {}
  local displaySlot = 0

  -- Debuff aura slots are 33-48
  for auraSlot = 33, 48 do
    local spellId = auras[auraSlot]
    if spellId and spellId > 0 then
      displaySlot = displaySlot + 1
      local spellName = C_Spell.GetSpellName(spellId)
      local texture = libdebuff:GetSpellIcon(spellId)
      local stacks = (auraApps and auraApps[auraSlot] or 0) + 1
      local dtype = nil
      if GetSpellRecField then
        local dispelId = GetSpellRecField(spellId, "dispel")
        if dispelId and dispelId > 0 then
          dtype = dispelTypeMap[dispelId]
        end
      end
      map[displaySlot] = {
        auraSlot = auraSlot,
        spellId = spellId,
        spellName = spellName or "Unknown",
        stacks = stacks,
        texture = texture,
        dtype = dtype
      }
    end
  end

  return map
end

-- Get caster info for a specific aura slot
local function GetSlotCaster(guid, auraSlot, spellName)
  -- First check our ownership tracking
  if slotOwnership[guid] and slotOwnership[guid][auraSlot] then
    local ownership = slotOwnership[guid][auraSlot]
    -- Verify spell name matches (slot might have been reused)
    if ownership.spellName == spellName then
      return ownership.casterGuid, ownership.isOurs
    end
  end
  
  -- Fallback: Check ownDebuffs
  local myGuid = GetPlayerGuid()
  if ownDebuffs[guid] and ownDebuffs[guid][spellName] then
    return myGuid, true
  end
  
  -- Fallback: Check allAuraCasts for any caster
  if allAuraCasts[guid] and allAuraCasts[guid][spellName] then
    for casterGuid, data in pairs(allAuraCasts[guid][spellName]) do
      local timeleft = (data.startTime + data.duration) - GetTime()
      if timeleft > 0 then
        return casterGuid, (casterGuid == myGuid)
      end
    end
  end
  
  return nil, false
end

-- ============================================================================
-- CLEANUP FUNCTIONS
-- ============================================================================

local lastRangeCheck = 0

-- Recycled buffers for cleanup (avoids table creation per call)
local _cleanupBuf1 = {}
local _cleanupBuf2 = {}

local function CleanupUnit(guid)
  if not guid then return false end
  
  local cleaned = false
  
  if ownDebuffs[guid] then
    ownDebuffs[guid] = nil
    cleaned = true
  end
  
  if slotOwnership[guid] then
    slotOwnership[guid] = nil
    cleaned = true
  end
  
  if allAuraCasts[guid] then
    allAuraCasts[guid] = nil
    cleaned = true
  end
  
  if objectsByGuid[guid] then
    objectsByGuid[guid] = nil
    cleaned = true
  end
  
  if pendingCasts[guid] then
    pendingCasts[guid] = nil
    cleaned = true
  end
  
  if debugStats.enabled and cleaned and IsCurrentTarget(guid) then
    DEFAULT_CHAT_FRAME:AddMessage(string.format("|cffff0000[CLEANUP]|r GUID %s", DebugGuid(guid)))
  end
  
  return cleaned
end

local function CleanupExpiredTimers(guid)
  local now = GetTime()
  
  -- Cleanup ownDebuffs
  if ownDebuffs[guid] then
    local n = 0
    for spellName, data in pairs(ownDebuffs[guid]) do
      local timeleft = (data.startTime + data.duration) - now
      if timeleft < -2 then -- Grace period
        n = n + 1
        _cleanupBuf1[n] = spellName
      end
    end
    for i = 1, n do
      ownDebuffs[guid][_cleanupBuf1[i]] = nil
      _cleanupBuf1[i] = nil
    end
  end
  
  -- Cleanup allAuraCasts
  if allAuraCasts[guid] then
    for spellName, casterTable in pairs(allAuraCasts[guid]) do
      local n2 = 0
      for casterGuid, data in pairs(casterTable) do
        local timeleft = (data.startTime + data.duration) - now
        if timeleft < -2 then
          n2 = n2 + 1
          _cleanupBuf2[n2] = casterGuid
        end
      end
      for i = 1, n2 do
        allAuraCasts[guid][spellName][_cleanupBuf2[i]] = nil
        _cleanupBuf2[i] = nil
      end
      -- Remove empty spell tables
      local hasCasters = false
      for _ in pairs(allAuraCasts[guid][spellName]) do
        hasCasters = true
        break
      end
      if not hasCasters then
        allAuraCasts[guid][spellName] = nil
      end
    end
  end
end

local function CleanupOutOfRangeUnits()
  local now = GetTime()
  -- Cleanup expired pending entries (every 1s)
  if not pfUI.libdebuff_last_pending_cleanup then pfUI.libdebuff_last_pending_cleanup = 0 end
  if now - pfUI.libdebuff_last_pending_cleanup >= 1 then
    pfUI.libdebuff_last_pending_cleanup = now
    for guid, spells in pairs(ownDebuffs) do
      for spellName, data in pairs(spells) do
        if data.pending then
          local timeleft = (data.startTime + data.duration) - now
          if timeleft < -2 then
            spells[spellName] = nil
          end
        end
      end
    end
  end

  if now - lastRangeCheck < 10 then return end
  lastRangeCheck = now
  
  local allGuids = {}
  for guid in pairs(ownDebuffs) do allGuids[guid] = true end
  for guid in pairs(slotOwnership) do allGuids[guid] = true end
  for guid in pairs(allAuraCasts) do allGuids[guid] = true end
  for guid in pairs(objectsByGuid) do allGuids[guid] = true end
  for guid in pairs(pendingCasts) do allGuids[guid] = true end
  
  for guid in pairs(allGuids) do
    local exists = UnitExists and UnitExists(guid)
    local isDead = UnitIsDead and UnitIsDead(guid)
    
    if not exists or isDead then
      CleanupUnit(guid)
    end
  end
  
  -- Cleanup old lastCastRanks
  for spell, data in pairs(lastCastRanks) do
    if now - data.time > 3 then
      lastCastRanks[spell] = nil
    end
  end
  
  -- Cleanup old lastFailedSpells
  for spell, data in pairs(lastFailedSpells) do
    if now - data.time > 2 then
      lastFailedSpells[spell] = nil
    end
  end
  
  -- Cleanup old pendingCasts
  for guid, spells in pairs(pendingCasts) do
    for spell, data in pairs(spells) do
      if now - data.time > 1 then
        pendingCasts[guid][spell] = nil
      end
    end
    local isEmpty = true
    for _ in pairs(pendingCasts[guid]) do
      isEmpty = false
      break
    end
    if isEmpty then
      pendingCasts[guid] = nil
    end
  end
end

-- ============================================================================
-- DURATION FUNCTIONS
-- ============================================================================

function libdebuff:GetDuration(effect, rank)
  if L["debuffs"][effect] then
    local rank = rank and tonumber((string.gsub(rank, RANK, ""))) or 0
    local rank = L["debuffs"][effect][rank] and rank or libdebuff:GetMaxRank(effect)
    local duration = L["debuffs"][effect][rank]

    if effect == L["dyndebuffs"]["Demoralizing Shout"] then
      local _,_,_,_,count = GetTalentInfo(2,1)
      if count and count > 0 then duration = duration + ( duration / 100 * (count*10)) end
    elseif effect == L["dyndebuffs"]["Shadow Word: Pain"] then
      local _,_,_,_,count = GetTalentInfo(3,4)
      if count and count > 0 then duration = duration + count * 3 end
    elseif effect == L["dyndebuffs"]["Frostbolt"] then
      local _,_,_,_,count = GetTalentInfo(3,7)
      if count and count > 0 then duration = duration + count end
    elseif effect == L["dyndebuffs"]["Gouge"] then
      local _,_,_,_,count = GetTalentInfo(3,3)
      if count and count > 0 then duration = duration + (count*.5) end
    end
    return duration
  else
    return 0
  end
end

function libdebuff:GetMaxRank(effect)
  local max = 0
  for id in pairs(L["debuffs"][effect]) do
    if id > max then max = id end
  end
  return max
end

function libdebuff:UpdateDuration(unit, unitlevel, effect, duration)
  if not unit or not effect or not duration then return end
  unitlevel = unitlevel or 0

  if libdebuff.objects[unit] and libdebuff.objects[unit][unitlevel] and libdebuff.objects[unit][unitlevel][effect] then
    libdebuff.objects[unit][unitlevel][effect].duration = duration
  end
end

function libdebuff:UpdateUnits()
  if not pfUI.uf or not pfUI.uf.target then return end
  pfUI.uf:RefreshUnit(pfUI.uf.target, "aura")
end

-- ============================================================================
-- LEGACY API (for turtle-wow.lua compatibility)
-- ============================================================================

libdebuff.pending = {}
libdebuff.objects = {}

function libdebuff:AddPending(unit, unitlevel, effect, duration, caster, rank)
  if not unit or duration <= 0 then return end
  if not L["debuffs"][effect] then return end
  if libdebuff.pending[3] then return end

  libdebuff.pending[1] = unit
  libdebuff.pending[2] = unitlevel or 0
  libdebuff.pending[3] = effect
  libdebuff.pending[4] = duration
  libdebuff.pending[5] = caster
  libdebuff.pending[6] = rank

  QueueFunction(libdebuff.PersistPending)
end

function libdebuff:RemovePending()
  libdebuff.pending[1] = nil
  libdebuff.pending[2] = nil
  libdebuff.pending[3] = nil
  libdebuff.pending[4] = nil
  libdebuff.pending[5] = nil
  libdebuff.pending[6] = nil
end

function libdebuff:PersistPending(effect)
  if not libdebuff.pending[3] then return end

  if libdebuff.pending[3] == effect or ( effect == nil and libdebuff.pending[3] ) then
    local p1, p2, p3, p4, p5, p6 = libdebuff.pending[1], libdebuff.pending[2], libdebuff.pending[3], libdebuff.pending[4], libdebuff.pending[5], libdebuff.pending[6]
    libdebuff.AddEffect(libdebuff, p1, p2, p3, p4, p5, p6)
  end

  libdebuff:RemovePending()
end

function libdebuff:AddEffect(unit, unitlevel, effect, duration, caster, rank)
  if not rank and caster == "player" and effect then
    if libdebuff.pending[3] == effect and libdebuff.pending[6] then
      rank = libdebuff.pending[6]
    elseif lastCastRanks[effect] and (GetTime() - lastCastRanks[effect].time) < 2 then
      rank = lastCastRanks[effect].rank
    end
  end
  
  if not unit then return end
  unitlevel = unitlevel or 0
  
  -- Create tables if needed
  libdebuff.objects[unit] = libdebuff.objects[unit] or {}
  libdebuff.objects[unit][unitlevel] = libdebuff.objects[unit][unitlevel] or {}
  
  -- Get duration from spell database if not provided
  if not duration or duration == 0 then
    duration = libdebuff:GetDuration(effect, rank)
  end
  
  -- Store/update effect
  local now = GetTime()
  local existing = libdebuff.objects[unit][unitlevel][effect]
  
  if existing then
    existing.start = now
    existing.duration = duration
    existing.caster = caster
    existing.rank = rank
  else
    libdebuff.objects[unit][unitlevel][effect] = {
      start = now,
      duration = duration,
      caster = caster,
      rank = rank
    }
  end
  
  lastspell = libdebuff.objects[unit][unitlevel][effect]
end

-- ============================================================================
-- API: GetBestAuraCast (for libpredict HoT tracking)
-- ============================================================================

function libdebuff:GetBestAuraCast(guid, spellName)
  if not guid or not spellName then return nil end
  
  -- Check ownDebuffs first (for our casts)
  if ownDebuffs[guid] and ownDebuffs[guid][spellName] then
    local data = ownDebuffs[guid][spellName]
    local timeleft = (data.startTime + data.duration) - GetTime()
    if timeleft > 0 then
      return data.startTime, data.duration, timeleft, data.rank, GetPlayerGuid()
    end
  end
  
  -- Check allAuraCasts (for any caster)
  if allAuraCasts[guid] and allAuraCasts[guid][spellName] then
    local bestData = nil
    local bestCaster = nil
    local bestTimeleft = 0
    
    for casterGuid, data in pairs(allAuraCasts[guid][spellName]) do
      local timeleft = (data.startTime + data.duration) - GetTime()
      if timeleft > bestTimeleft then
        bestTimeleft = timeleft
        bestData = data
        bestCaster = casterGuid
      end
    end
    
    if bestData and bestTimeleft > 0 then
      return bestData.startTime, bestData.duration, bestTimeleft, bestData.rank, bestCaster
    end
  end
  
  return nil
end

-- ============================================================================
-- NAMPOWER EVENT HANDLING
-- ============================================================================

if hasNampower then
  -- Carnage Talent Rank
  local carnageRank = 0
  local function UpdateCarnageRank()
    if class ~= "DRUID" then return end
    local _, _, _, _, rank = GetTalentInfo(2, 17)
    carnageRank = rank or 0
  end
  
  -- Persistent Carnage check frame (reused instead of CreateFrame per Bite)
  local carnageState = nil  -- {targetGuid, checkTime}
  local carnageCheckFrame = CreateFrame("Frame")
  carnageCheckFrame:Hide()
  carnageCheckFrame:SetScript("OnUpdate", function()
    if not carnageState then
      this:Hide()
      return
    end
    if GetTime() < carnageState.checkTime then return end
    
    -- Check if we gained a combo point (indicates Carnage proc)
    local cp = GetComboPoints() or 0
    
    if cp > 0 then
      -- Carnage triggered! Refresh Rip & Rake
      local guid = carnageState.targetGuid
      local refreshTime = GetTime()
      local myGuid = GetPlayerGuid()
      
      -- Refresh in ownDebuffs - only if timer still active
      if ownDebuffs[guid] then
        if ownDebuffs[guid]["Rip"] then
          local timeleft = (ownDebuffs[guid]["Rip"].startTime + ownDebuffs[guid]["Rip"].duration) - refreshTime
          if timeleft > 0 then
            ownDebuffs[guid]["Rip"].startTime = refreshTime
            if debugStats.enabled then
              DEFAULT_CHAT_FRAME:AddMessage("|cff00ffff[CARNAGE]|r Rip refreshed (CP detected)")
            end
          end
        end
        if ownDebuffs[guid]["Rake"] then
          local timeleft = (ownDebuffs[guid]["Rake"].startTime + ownDebuffs[guid]["Rake"].duration) - refreshTime
          if timeleft > 0 then
            ownDebuffs[guid]["Rake"].startTime = refreshTime
            if debugStats.enabled then
              DEFAULT_CHAT_FRAME:AddMessage("|cff00ffff[CARNAGE]|r Rake refreshed (CP detected)")
            end
          end
        end
      end
      
      -- Refresh in allAuraCasts - only if timer still active
      if allAuraCasts[guid] then
        if allAuraCasts[guid]["Rip"] and allAuraCasts[guid]["Rip"][myGuid] then
          local d = allAuraCasts[guid]["Rip"][myGuid]
          if (d.startTime + d.duration) > refreshTime then
            d.startTime = refreshTime
          end
        end
        if allAuraCasts[guid]["Rake"] and allAuraCasts[guid]["Rake"][myGuid] then
          local d = allAuraCasts[guid]["Rake"][myGuid]
          if (d.startTime + d.duration) > refreshTime then
            d.startTime = refreshTime
          end
        end
      end
      
      -- Trigger UI updates
      if pfTarget and UnitGUID("target") then
        local currentTargetGuid = UnitGUID("target")
        if currentTargetGuid == guid then
          pfTarget.update_aura = true
        end
      end
    end

    carnageState = nil
    this:Hide()
  end)
  
  local frame = CreateFrame("Frame")
  frame:RegisterEvent("PLAYER_ENTERING_WORLD")
  frame:RegisterEvent("PLAYER_TALENT_UPDATE")
  frame:RegisterEvent("PLAYER_LOGOUT")
  frame:RegisterEvent("SPELLCAST_CHANNEL_STOP")
  frame:RegisterEvent("SPELL_START_SELF")
  frame:RegisterEvent("SPELL_START_OTHER")
  frame:RegisterEvent("SPELL_GO_SELF")
  frame:RegisterEvent("SPELL_GO_OTHER")
  frame:RegisterEvent("SPELL_FAILED_OTHER")
  frame:RegisterEvent("UNIT_DIED")
  frame:RegisterEvent("SPELL_CAST_EVENT")
  frame:RegisterEvent("AURA_CAST_ON_SELF")
  frame:RegisterEvent("AURA_CAST_ON_OTHER")
  frame:RegisterEvent("DEBUFF_ADDED_OTHER")
  frame:RegisterEvent("DEBUFF_REMOVED_OTHER")
  frame:RegisterEvent("PLAYER_TARGET_CHANGED")
  frame:RegisterEvent("UNIT_HEALTH")
  
  frame:SetScript("OnEvent", function()
    if event == "PLAYER_LOGOUT" then
      this:UnregisterAllEvents()
      this:SetScript("OnEvent", nil)
      return
      
    elseif event == "SPELLCAST_CHANNEL_STOP" then
      -- Channel interrupted by player - clear ownDebuffs for the channeled spell
      -- via C_Spell.ChannelInfo. DEBUFF_REMOVED fires later (0.5-1s server lag),
      -- causing phantom debuff display without this pre-clear.
      local spellName = C_Spell.ChannelInfo()
      if spellName then
        local targetGuid = UnitGUID and UnitGUID("target")
        if targetGuid and ownDebuffs[targetGuid] and ownDebuffs[targetGuid][spellName] then
          local data = ownDebuffs[targetGuid][spellName]
          local remaining = (data.startTime + data.duration) - GetTime()
          if remaining > 0 then
            ownDebuffs[targetGuid][spellName] = nil
          end
        end
      end
    elseif event == "PLAYER_ENTERING_WORLD" or event == "PLAYER_TALENT_UPDATE" then
      UpdateCarnageRank()
    elseif event == "UNIT_HEALTH" then
      local guid = arg1
      if guid and UnitIsDead and UnitIsDead(guid) then
        CleanupUnit(guid)
      end
      if pfUI.libdebuff_unit_health_hooks then
        for _, fn in pairs(pfUI.libdebuff_unit_health_hooks) do
          fn(arg1)
        end
      end

    elseif event == "SPELL_START_SELF" or event == "SPELL_START_OTHER" then
      local spellId = arg2
      local casterGuid = arg3
      -- arg6=castTime (ms), arg7=channel duration (ms). Prefer arg6 when set —
      -- some spells (e.g. post-rework Volley) flag as channel via arg8 but ship a
      -- real cast time in arg6, so we only fall back to arg7 for true channels
      -- like Blizzard where arg6 is 0/nil.
      local castTime = (arg6 and arg6 > 0) and arg6 or arg7
      if not casterGuid or not spellId then return end

      if event == "SPELL_START_SELF" and pfUI.libdebuff_spell_start_self_hooks then
        for _, fn in pairs(pfUI.libdebuff_spell_start_self_hooks) do
          fn(spellId, casterGuid, arg4, castTime)
        end
      elseif event == "SPELL_START_OTHER" and pfUI.libdebuff_spell_start_other_hooks then
        for _, fn in pairs(pfUI.libdebuff_spell_start_other_hooks) do
          fn(spellId, casterGuid, arg4, castTime)
        end
      end

    elseif event == "SPELL_GO_SELF" or event == "SPELL_GO_OTHER" then
      local itemId = arg1
      local spellId = arg2
      local casterGuid = arg3
      local targetGuid = arg4
      local numHit = arg6 or 0
      local numMissed = arg7 or 0

      -- Fire registered SPELL_GO_SELF hooks BEFORE miss guard
      -- (Swingtimer needs to see ALL casts, even misses, for swing reset)
      if event == "SPELL_GO_SELF" and pfUI.libdebuff_spell_go_hooks then
        for _, fn in pairs(pfUI.libdebuff_spell_go_hooks) do
          fn(spellId, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
        end
      end

      if numMissed > 0 or numHit == 0 then return end

      local spellName = C_Spell.GetSpellName(spellId)
      if not spellName then return end
      local spellRankString = C_Spell.GetSpellSubtext(spellId)

      local castRank = 0
      if spellRankString and spellRankString ~= "" then
        castRank = tonumber((string.gsub(spellRankString, "Rank ", ""))) or 0
      end

      -- Store in pendingCasts for DEBUFF_ADDED correlation.
      -- If this cast is a downrank of an already active debuff, fire the downrank blocked hook
      -- so external addons (e.g. SuperCleveRoidMacros) don't need to re-implement this check.
      if targetGuid then
        pendingCasts[targetGuid] = pendingCasts[targetGuid] or {}
        local isDownrankBlocked = false
        if castRank > 0 then
          local existingOwn = ownDebuffs[targetGuid] and ownDebuffs[targetGuid][spellName]
          if existingOwn and existingOwn.rank and existingOwn.rank > castRank then
            local existingTimeleft = (existingOwn.startTime + existingOwn.duration) - GetTime()
            if existingTimeleft > 0 then
              isDownrankBlocked = true
              -- Fire hook so external addons know this cast was downrank-blocked
              if pfUI.libdebuff_downrank_blocked_hooks then
                for _, fn in pairs(pfUI.libdebuff_downrank_blocked_hooks) do
                  fn(spellName, castRank, existingOwn.rank, targetGuid, casterGuid)
                end
              end
            end
          end
        end
        -- Always write pendingCasts — let consumers use the hook to handle downrank themselves
        pendingCasts[targetGuid][spellName] = {
          casterGuid = casterGuid,
          rank = castRank,
          time = GetTime(),
          downrankBlocked = isDownrankBlocked
        }
      end

      -- selfdebuff mode: write ownDebuffs immediately on confirmed hit
      -- so buffwatch shows our debuffs even when over the 16 debuff cap
      if event == "SPELL_GO_SELF" and targetGuid and not isNullTarget then
        local selfdebuffMode = pfUI_config and pfUI_config.buffbar and
          pfUI_config.buffbar.tdebuff and pfUI_config.buffbar.tdebuff.selfdebuff == "1"
        if selfdebuffMode then
          local myGuid2 = GetPlayerGuid()
          if casterGuid == myGuid2 then
            local duration = libdebuff:GetDuration(spellName, castRank) or 0
            if duration > 0 then
              local texture = libdebuff:GetSpellIcon(spellId)
              ownDebuffs[targetGuid] = ownDebuffs[targetGuid] or {}
              -- Downrank protection
              local existing = ownDebuffs[targetGuid][spellName]
              local blocked = false
              if existing and existing.rank and castRank > 0 and existing.rank > castRank then
                local existingTimeleft = (existing.startTime + existing.duration) - GetTime()
                if existingTimeleft > 0 then blocked = true end
              end
              if not blocked then
                ownDebuffs[targetGuid][spellName] = {
                  startTime = GetTime(),
                  duration  = duration,
                  texture   = texture,
                  rank      = castRank,
                  spellId   = spellId,
                  stacks    = 1,
                  pending   = true,
                }
              end
            end
          end
        end
      end
      
      -- Store rank for our casts
      local myGuid = GetPlayerGuid()
      if casterGuid == myGuid then
        lastCastRanks[spellName] = {
          rank = castRank,
          time = GetTime()
        }
      end
      
      -- CARNAGE TALENT: Ferocious Bite refreshes Rip & Rake
      -- Check for combo point gain after Bite (indicates Carnage proc)
      -- Carnage gives +1 CP immediately after Bite if it procs
      if class == "DRUID" and carnageRank >= 1 and spellName == "Ferocious Bite" and casterGuid == myGuid then
        if targetGuid and numHit > 0 then
          -- Schedule delayed check (50ms to allow CP to register)
          carnageState = {
            targetGuid = targetGuid,
            checkTime = GetTime() + 0.05
          }
          carnageCheckFrame:Show()
        end
      end

      -- Fire registered SPELL_GO_OTHER hooks
      if event == "SPELL_GO_OTHER" and pfUI.libdebuff_spell_go_other_hooks then
        for _, fn in pairs(pfUI.libdebuff_spell_go_other_hooks) do
          fn(spellId, casterGuid, targetGuid)
        end
      end

    elseif event == "UNIT_DIED" then
      if pfUI.libdebuff_unit_died_hooks then
        for _, fn in pairs(pfUI.libdebuff_unit_died_hooks) do
          fn(arg1)
        end
      end

    elseif event == "SPELL_FAILED_OTHER" then
      local casterGuid = arg1
      if pfUI.libdebuff_spell_failed_other_hooks then
        for _, fn in pairs(pfUI.libdebuff_spell_failed_other_hooks) do
          fn(casterGuid, arg2)
        end
      end

    elseif event == "SPELL_CAST_EVENT" then
      -- Capture combo points BEFORE they're consumed
      -- This event fires when YOU cast a spell (before server processes it)
      local success = arg1
      local spellId = arg2
      local castType = arg3
      local targetGuid = arg4
      
      if success ~= 1 or not spellId then return end

      local spellName = C_Spell.GetSpellName(spellId)

      -- Store pending cast info for libpredict (heal prediction target tracking)
      -- This allows libpredict to resolve the correct target for Nampower queued casts,
      -- where CastSpellByName hook fires while current_cast is set and spell_queue
      -- cannot be updated. SPELL_CAST_EVENT fires right before SPELLCAST_START.
      if spellName and targetGuid and targetGuid ~= "" and targetGuid ~= "0x0000000000000000" then
        pfUI.libpredict_pending_cast.spellId = spellId
        pfUI.libpredict_pending_cast.spellName = spellName
        pfUI.libpredict_pending_cast.targetGuid = targetGuid
        pfUI.libpredict_pending_cast.time = GetTime()
      else
        -- No explicit target - clear pending so libpredict falls back to spell_queue
        pfUI.libpredict_pending_cast.spellId = nil
        pfUI.libpredict_pending_cast.spellName = nil
        pfUI.libpredict_pending_cast.targetGuid = nil
        pfUI.libpredict_pending_cast.time = nil
      end
      
      -- Fire registered SPELL_CAST_EVENT hooks
      if pfUI.libdebuff_spell_cast_hooks then
        for _, fn in pairs(pfUI.libdebuff_spell_cast_hooks) do
          fn(success, spellId, castType, targetGuid)
        end
      end
      
    elseif event == "AURA_CAST_ON_SELF" or event == "AURA_CAST_ON_OTHER" then
      local spellId = arg1
      local casterGuid = arg2
      local targetGuid = arg3
      local effect = arg4
      local effectAuraName = arg5
      local effectAmplitude = arg6
      local effectMiscValue = arg7
      local durationMs = arg8
      local auraCapStatus = arg9
      
      if not spellId then return end
      if not targetGuid or targetGuid == "" or targetGuid == "0x0000000000000000" then return end
      
      local spellName = C_Spell.GetSpellName(spellId)
      if not spellName then return end
      
      -- Deduplicate: Ignore if we processed this exact cast recently (within 100ms)
      -- Nampower fires multiple AURA_CAST events for multi-effect spells (e.g. Faerie Fire has 3 effects)
      recentCasts[targetGuid] = recentCasts[targetGuid] or {}
      recentCasts[targetGuid][spellName] = recentCasts[targetGuid][spellName] or {}
      
      local now = GetTime()
      local lastCastTime = recentCasts[targetGuid][spellName][casterGuid]
      
      if lastCastTime and (now - lastCastTime) < AURA_CAST_DEDUPE_WINDOW then
        return  -- Duplicate event, ignore
      end
      
      recentCasts[targetGuid][spellName][casterGuid] = now
      
      -- Rank aus spellId ermitteln
      local rankNum = 0
      local rankString = C_Spell.GetSpellSubtext(spellId)
      if rankString and rankString ~= "" then
        rankNum = tonumber((string.gsub(rankString, "Rank ", ""))) or 0
      end
      
      local duration = durationMs and (durationMs / 1000) or 0
      local startTime = GetTime()
      local myGuid = GetPlayerGuid()
      local isOurs = (myGuid and casterGuid == myGuid)
      
      if debugStats.enabled and isOurs then
        debugStats.aura_cast = debugStats.aura_cast + 1
      end
      
      -- Duration comes from nampower's AURA_CAST event. ClassicAPI's
      -- C_UnitAuras now resolves combo-scaled durations server-side, so
      -- libdebuff only needs the database fallback when AURA_CAST reports 0.
      if duration == 0 then
        duration = libdebuff:GetDuration(spellName, rankNum) or 0
      end
      
      -- Store in allAuraCasts
      if targetGuid and targetGuid ~= "" and targetGuid ~= "0x0000000000000000" then
        allAuraCasts[targetGuid] = allAuraCasts[targetGuid] or {}
        allAuraCasts[targetGuid][spellName] = allAuraCasts[targetGuid][spellName] or {}
        
        -- Downrank Protection: Check BEFORE clearing old casters!
        -- For selfOverwrite debuffs, check ALL existing casters
        if selfOverwriteDebuffs[spellName] then
          for otherCaster, existingData in pairs(allAuraCasts[targetGuid][spellName]) do
            if existingData.rank and rankNum and rankNum > 0 then
              local existingTimeleft = (existingData.startTime + existingData.duration) - GetTime()
              if existingTimeleft > 0 and rankNum < existingData.rank then
                -- Lower rank cannot overwrite higher rank - block the update
                if debugStats.enabled then
                  DEFAULT_CHAT_FRAME:AddMessage(string.format("|cffff0000[DOWNRANK BLOCKED]|r %s: Rank %d from %s cannot overwrite Rank %d from %s (%.1fs left)", 
                    spellName, rankNum, DebugGuid(casterGuid), existingData.rank, DebugGuid(otherCaster), existingTimeleft))
                end
                return
              end
            end
          end
        else
          -- For non-selfOverwrite: Check only same caster
          local existingData = allAuraCasts[targetGuid][spellName][casterGuid]
          if existingData and existingData.rank and rankNum and rankNum > 0 then
            local existingTimeleft = (existingData.startTime + existingData.duration) - GetTime()
            if existingTimeleft > 0 and rankNum < existingData.rank then
              if debugStats.enabled and isOurs then
                DEFAULT_CHAT_FRAME:AddMessage(string.format("|cffff0000[DOWNRANK BLOCKED]|r %s: Rank %d cannot overwrite Rank %d (%.1fs left)", 
                  spellName, rankNum, existingData.rank, existingTimeleft))
              end
              return
            end
          end
        end
        
        -- Handle self-overwrite debuffs (clear other casters)
        if selfOverwriteDebuffs[spellName] then
          local n = 0
          for otherCaster in pairs(allAuraCasts[targetGuid][spellName]) do
            if otherCaster ~= casterGuid then
              n = n + 1
              _cleanupBuf1[n] = otherCaster
            end
          end
          for i = 1, n do
            allAuraCasts[targetGuid][spellName][_cleanupBuf1[i]] = nil
            _cleanupBuf1[i] = nil
          end
          
          -- Clear from ownDebuffs if we're being overwritten
          if not isOurs and ownDebuffs[targetGuid] and ownDebuffs[targetGuid][spellName] then
            ownDebuffs[targetGuid][spellName] = nil
          end
        end
        
        -- Handle variant pairs (Faerie Fire <-> Faerie Fire (Feral))
        if debuffOverwritePairs[spellName] then
          local otherVariant = debuffOverwritePairs[spellName]
          if allAuraCasts[targetGuid][otherVariant] and allAuraCasts[targetGuid][otherVariant][casterGuid] then
            allAuraCasts[targetGuid][otherVariant][casterGuid] = nil
          end
        end
        
        -- Store timer data
        allAuraCasts[targetGuid][spellName][casterGuid] = {
          startTime = startTime,
          duration = duration,
          rank = rankNum
        }
        
        -- UPDATE slotOwnership for selfOverwrite refreshes
        -- (DEBUFF_ADDED doesn't fire on refresh, so we must update here!)
        if selfOverwriteDebuffs[spellName] and slotOwnership[targetGuid] then
          for auraSlot, ownership in pairs(slotOwnership[targetGuid]) do
            if ownership.spellName == spellName then
              -- Update the casterGuid and isOurs for this slot
              ownership.casterGuid = casterGuid
              ownership.isOurs = isOurs
              
              if debugStats.enabled and IsCurrentTarget(targetGuid) then
                DEFAULT_CHAT_FRAME:AddMessage(string.format("|cff00ff00[SLOT UPDATED]|r aura=%d %s newCaster=%s isOurs=%s", 
                  auraSlot, spellName, DebugGuid(casterGuid), tostring(isOurs)))
              end
              break
            end
          end
        end
        
        if debugStats.enabled and IsCurrentTarget(targetGuid) then
          DEFAULT_CHAT_FRAME:AddMessage(string.format("%s |cff00ffff[AURA_CAST]|r %s target=%s caster=%s isOurs=%s dur=%.1fs", 
            GetDebugTimestamp(), spellName, DebugGuid(targetGuid), DebugGuid(casterGuid), tostring(isOurs), duration))
        end

      end
      
        -- Notify unitframes of debuff updates (UNIT_AURA doesn't fire on refreshes!)
        -- Check player
        if IsPlayerGuid(targetGuid) and pfPlayer then
          pfPlayer.update_aura = true
        end
        
        -- Check target
        if UnitExists("target") then
          local tarUnitGUID = UnitGUID("target")
          if tarUnitGUID == targetGuid and pfTarget then
            pfTarget.update_aura = true
          end
        end
      
      -- Only track in ownDebuffs if it's OUR debuff
      if not isOurs then return end
      if targetGuid == myGuid then return end  -- Skip self-buffs
      if not targetGuid or targetGuid == "" or targetGuid == "0x0000000000000000" then return end
      
      -- Get texture
      local texture = libdebuff:GetSpellIcon(spellId)
      
      -- Write ownDebuffs if:
      -- (a) Entry already exists (refresh of active debuff), OR
      -- (b) pendingCasts has an entry for this spell (SPELL_GO confirmed a hit is in-flight,
      --     not a miss). This allows the downrank hook in SPELL_GO to fire correctly on first cast.
      -- Without (b), ownDebuffs is empty until DEBUFF_ADDED (~300ms later), meaning the downrank
      -- check in SPELL_GO has no data to work with on the first cast.
      local entryExists = ownDebuffs[targetGuid] and ownDebuffs[targetGuid][spellName]
      local pendingConfirm = pendingCasts[targetGuid] and pendingCasts[targetGuid][spellName]
      if not entryExists and not pendingConfirm then return end

      ownDebuffs[targetGuid] = ownDebuffs[targetGuid] or {}
      local data = ownDebuffs[targetGuid][spellName]
      -- For first-cast path (pendingConfirm but no existing entry): create a new entry
      if not data then
        if not pendingConfirm then return end  -- race condition: cleared by DEBUFF_REMOVED
        data = {}
        ownDebuffs[targetGuid][spellName] = data
      end
      
      -- Downrank Protection: Check if existing debuff is still active and has higher rank
      if data.startTime and data.duration and data.rank and rankNum > 0 then
        local existingTimeleft = (data.startTime + data.duration) - GetTime()
        if existingTimeleft > 0 then
          -- Existing debuff is still active
          if rankNum < data.rank then
            -- Lower rank cannot overwrite higher rank - block the update
            if debugStats.enabled then
              DEFAULT_CHAT_FRAME:AddMessage(string.format("|cffff0000[DOWNRANK BLOCKED]|r %s: Rank %d cannot overwrite Rank %d (%.1fs left)", 
                spellName, rankNum, data.rank, existingTimeleft))
            end
            return
          end
        end
      end
      
      data.startTime = startTime
      data.duration = duration
      data.texture = texture
      data.rank = rankNum
      data.spellId = spellId
      
      -- Handle variant pairs for ownDebuffs
      if debuffOverwritePairs[spellName] then
        local otherVariant = debuffOverwritePairs[spellName]
        if ownDebuffs[targetGuid][otherVariant] then
          ownDebuffs[targetGuid][otherVariant] = nil
        end
      end
      
      -- Store for Cleveroids API
      objectsByGuid[targetGuid] = objectsByGuid[targetGuid] or {}
      objectsByGuid[targetGuid][spellId] = {
        start = startTime,
        duration = duration,
        caster = "player",
        stacks = 1
      }
      if event == "AURA_CAST_ON_SELF" and pfUI.libdebuff_aura_cast_on_self_hooks then
        for _, fn in pairs(pfUI.libdebuff_aura_cast_on_self_hooks) do
          fn(spellId, casterGuid, targetGuid)
        end
      elseif event == "AURA_CAST_ON_OTHER" and pfUI.libdebuff_aura_cast_on_other_hooks then
        for _, fn in pairs(pfUI.libdebuff_aura_cast_on_other_hooks) do
          fn(spellId, casterGuid, targetGuid)
        end
      end

    elseif event == "DEBUFF_ADDED_OTHER" then
      local guid = arg1
      local displaySlot = arg2  -- Display slot (1-16), compacted
      local spellId = arg3
      local stacks = arg4
      local auraSlot_0based = arg6  -- Nampower 2.29+: raw slot 0-based (32-47)

      -- Convert 0-based (Nampower event) to 1-based (Lua GetUnitField array)
      local auraSlot = auraSlot_0based and (auraSlot_0based + 1) or nil

      -- Invalidate slot map cache for this GUID
      
      local spellName = C_Spell.GetSpellName(spellId)
      if not spellName then return end
      
      if debugStats.enabled then
        debugStats.debuff_added = debugStats.debuff_added + 1
      end
      
      -- If unit is dead, cleanup and skip
      if UnitIsDead and UnitIsDead(guid) then
        CleanupUnit(guid)
        return
      end
      
      -- Get auraSlot from event parameter (Nampower 2.29+)
      -- Fallback to GetUnitField lookup if not available
      if not auraSlot then
        local slotMap = GetDebuffSlotMap(guid)
        if slotMap and slotMap[displaySlot] then
          auraSlot = slotMap[displaySlot].auraSlot
        end
      end
      
      -- Fallback: Calculate aura slot if GetUnitField didn't work
      -- (This assumes no gaps, which isn't always true, but better than nothing)
      if not auraSlot then
        auraSlot = 32 + displaySlot
      end
      
      -- Get caster from pendingCasts (SPELL_GO correlation)
      local casterGuid = nil
      if pendingCasts[guid] and pendingCasts[guid][spellName] then
        local pending = pendingCasts[guid][spellName]
        if GetTime() - pending.time < 0.5 then
          casterGuid = pending.casterGuid
          pendingCasts[guid][spellName] = nil
        end
      end
      
      -- Fallback: Check allAuraCasts for most recent caster
      if not casterGuid and allAuraCasts[guid] and allAuraCasts[guid][spellName] then
        local mostRecent = nil
        local mostRecentTime = 0
        for casterId, data in pairs(allAuraCasts[guid][spellName]) do
          if data.startTime > mostRecentTime then
            mostRecentTime = data.startTime
            mostRecent = casterId
          end
        end
        if mostRecent then
          casterGuid = mostRecent
        end
      end
      
      local myGuid = GetPlayerGuid()
      local isOurs = (myGuid and casterGuid == myGuid)
      
      -- Fallback: Check ownDebuffs timing
      if not isOurs and not casterGuid then
        if ownDebuffs[guid] and ownDebuffs[guid][spellName] then
          local age = GetTime() - ownDebuffs[guid][spellName].startTime
          if age < 0.5 then
            isOurs = true
            casterGuid = myGuid
          end
        end
      end
      
      -- Store slot ownership (KEY: auraSlot is STABLE, no shifting needed!)
      slotOwnership[guid] = slotOwnership[guid] or {}
      slotOwnership[guid][auraSlot] = {
        casterGuid = casterGuid,
        spellName = spellName,
        spellId = spellId,
        isOurs = isOurs
      }
      
      -- Store displaySlot → auraSlot mapping for DEBUFF_REMOVED
      displayToAura[guid] = displayToAura[guid] or {}
      displayToAura[guid][displaySlot] = auraSlot
      
      if debugStats.enabled and IsCurrentTarget(guid) then
        DEFAULT_CHAT_FRAME:AddMessage(string.format("%s |cff00ff00[DEBUFF_ADDED]|r display=%d aura=%d %s caster=%s isOurs=%s", 
          GetDebugTimestamp(), displaySlot, auraSlot, spellName, DebugGuid(casterGuid), tostring(isOurs)))
      end
      
      -- CRITICAL FIX: Update ownDebuffs here too for refresh timing!
      -- This prevents the gap between DEBUFF_REMOVED and AURA_CAST where buffwatch shows nothing
      if isOurs and casterGuid then
        if myGuid and casterGuid == myGuid then
          -- Check if we have timer data from allAuraCasts
          if allAuraCasts[guid] and allAuraCasts[guid][spellName] and allAuraCasts[guid][spellName][casterGuid] then
            local auraData = allAuraCasts[guid][spellName][casterGuid]
            local texture = libdebuff:GetSpellIcon(spellId)
            
            ownDebuffs[guid] = ownDebuffs[guid] or {}
            ownDebuffs[guid][spellName] = {
              startTime = auraData.startTime,
              duration = auraData.duration,
              texture = texture,
              rank = auraData.rank or 0,
              spellId = spellId
            }
            
            if debugStats.enabled and IsCurrentTarget(guid) then
              DEFAULT_CHAT_FRAME:AddMessage(string.format("|cffff00ff[OWNDEBUFF SYNC]|r %s from DEBUFF_ADDED", spellName))
            end
          end
        end
      end
      
      -- Cleanup expired timers
      CleanupExpiredTimers(guid)

      if pfUI.libdebuff_debuff_added_other_hooks then
        for _, fn in pairs(pfUI.libdebuff_debuff_added_other_hooks) do
          fn(arg1, arg2, arg3, arg4)
        end
      end

    elseif event == "DEBUFF_REMOVED_OTHER" then
      local guid = arg1
      local displaySlot = arg2  -- Display slot (1-16), compacted
      local spellId = arg3
      local auraSlot_0based = arg6  -- Nampower 2.29+: raw slot 0-based (32-47)

      -- Convert 0-based (Nampower event) to 1-based (Lua GetUnitField array)
      local auraSlot = auraSlot_0based and (auraSlot_0based + 1) or nil

      -- Invalidate slot map cache for this GUID

      local spellName = C_Spell.GetSpellName(spellId) or "?"

      if debugStats.enabled then
        debugStats.debuff_removed = debugStats.debuff_removed + 1
        if IsCurrentTarget(guid) then
          DEFAULT_CHAT_FRAME:AddMessage(string.format("%s |cffff9900[DEBUFF_REMOVED]|r display=%d aura=%d (0based=%d) %s", 
            GetDebugTimestamp(), displaySlot, auraSlot or -1, auraSlot_0based or -1, spellName))
        end
      end

      -- If unit is dead, cleanup all
      if UnitIsDead and UnitIsDead(guid) then
        CleanupUnit(guid)
        return
      end

      -- Get auraSlot from event parameter (Nampower 2.29+)
      -- Fallback to displayToAura mapping if not available
      local foundAuraSlot = auraSlot
      if not foundAuraSlot and displayToAura[guid] and displayToAura[guid][displaySlot] then
        foundAuraSlot = displayToAura[guid][displaySlot]
      end

      local wasOurs = false
      local removedCasterGuid = nil

      if foundAuraSlot then
        -- Get ownership info for this specific slot
        if slotOwnership[guid] and slotOwnership[guid][foundAuraSlot] then
          local ownership = slotOwnership[guid][foundAuraSlot]
          wasOurs = ownership.isOurs
          removedCasterGuid = ownership.casterGuid
        end
        
        -- Clear both mappings (with nil-checks)
        if slotOwnership[guid] then
          slotOwnership[guid][foundAuraSlot] = nil
        end
        if displayToAura[guid] then
          displayToAura[guid][displaySlot] = nil
        end
        
        if debugStats.enabled and IsCurrentTarget(guid) then
          DEFAULT_CHAT_FRAME:AddMessage(string.format("%s |cffff9900[SLOT CLEARED]|r aura=%d [arg6] %s wasOurs=%s caster=%s", 
            GetDebugTimestamp(), foundAuraSlot, spellName, tostring(wasOurs), DebugGuid(removedCasterGuid)))
        end
      end
      
      -- Remove from ownDebuffs if it was ours
      if wasOurs and ownDebuffs[guid] and ownDebuffs[guid][spellName] then
        local age = GetTime() - ownDebuffs[guid][spellName].startTime
        -- Only delete if not recently renewed
        if age > 1 then
          ownDebuffs[guid][spellName] = nil
        end
      end
      
      -- Remove from allAuraCasts
      if removedCasterGuid and allAuraCasts[guid] and allAuraCasts[guid][spellName] then
        if allAuraCasts[guid][spellName][removedCasterGuid] then
          local auraData = allAuraCasts[guid][spellName][removedCasterGuid]
          local age = GetTime() - auraData.startTime
          -- Only delete if not recently refreshed
          if age > 1 then
            allAuraCasts[guid][spellName][removedCasterGuid] = nil
          end
        end
      end
      
      -- Cleanup expired timers
      CleanupExpiredTimers(guid)

      if pfUI.libdebuff_debuff_removed_other_hooks then
        for _, fn in pairs(pfUI.libdebuff_debuff_removed_other_hooks) do
          fn(arg1, arg2, arg3, arg4)
        end
      end

    elseif event == "PLAYER_TARGET_CHANGED" then
      if not UnitGUID then return end
      local targetGuid = UnitGUID("target")
      
      if targetGuid and targetGuid ~= "" then
        -- Invalidate slot map cache on retarget
        -- Prevents stale slot mappings after untarget/retarget cycles
        -- Cleanup expired timers for new target
        CleanupExpiredTimers(targetGuid)
      end
      if pfUI.libdebuff_player_target_changed_hooks then
        for _, fn in pairs(pfUI.libdebuff_player_target_changed_hooks) do
          fn()
        end
      end
    end
    
    -- Periodic cleanup
    CleanupOutOfRangeUnits()
  end)
  
  -- Cleveroids API
  if CleveRoids then
    CleveRoids.libdebuff = libdebuff
    libdebuff.objects = objectsByGuid
  end
end

-- add libdebuff to pfUI API
pfUI.api.libdebuff = libdebuff

-- Expose debugStats for external access
libdebuff.debugStats = debugStats

-- ============================================================================
-- DEBUG COMMANDS
-- ============================================================================

_G.SLASH_LIBDEBUGSTATS1 = "/libdebugstats"
_G.SlashCmdList["LIBDEBUGSTATS"] = function(msg)
  msg = string.lower(msg or "")
  
  if msg == "start" then
    debugStats.enabled = true
    debugStats.trackAllUnits = false
    debugStats.aura_cast = 0
    debugStats.debuff_added = 0
    debugStats.debuff_removed = 0
    debugStats.getunitfield_calls = 0
    DEFAULT_CHAT_FRAME:AddMessage("|cff00ff00[libdebuff]|r Debug tracking STARTED")
    
  elseif msg == "stop" then
    debugStats.enabled = false
    DEFAULT_CHAT_FRAME:AddMessage("|cffff9900[libdebuff]|r Debug tracking STOPPED")
    
  elseif msg == "stats" then
    DEFAULT_CHAT_FRAME:AddMessage("|cff00ffff=== LIBDEBUFF STATS (GetUnitField Edition) ===|r")
    DEFAULT_CHAT_FRAME:AddMessage(string.format("AURA_CAST events: %d", debugStats.aura_cast))
    DEFAULT_CHAT_FRAME:AddMessage(string.format("DEBUFF_ADDED events: %d", debugStats.debuff_added))
    DEFAULT_CHAT_FRAME:AddMessage(string.format("DEBUFF_REMOVED events: %d", debugStats.debuff_removed))
    DEFAULT_CHAT_FRAME:AddMessage(string.format("GetUnitField calls: %d", debugStats.getunitfield_calls))
    DEFAULT_CHAT_FRAME:AddMessage("|cff00ff00No manual slot shifting needed!|r")
    
  elseif msg == "target" then
    if not UnitGUID("target") then
      DEFAULT_CHAT_FRAME:AddMessage("|cffff0000[libdebuff]|r No target!")
      return
    end
    
    local guid = UnitGUID("target")
    DEFAULT_CHAT_FRAME:AddMessage("|cff00ffff=== TARGET DEBUFF STATE ===|r")
    DEFAULT_CHAT_FRAME:AddMessage(string.format("GUID: %s", tostring(guid)))
    
    -- Show GetUnitField slot map
    local slotMap = GetDebuffSlotMap(guid)
    if slotMap then
      DEFAULT_CHAT_FRAME:AddMessage("|cff00ff00GetUnitField Slots:|r")
      for displaySlot, data in pairs(slotMap) do
        local casterGuid, isOurs = GetSlotCaster(guid, data.auraSlot, data.spellName)
        DEFAULT_CHAT_FRAME:AddMessage(string.format("  Display %d (aura %d): %s [caster=%s, ours=%s]", 
          displaySlot, data.auraSlot, data.spellName, DebugGuid(casterGuid), tostring(isOurs)))
      end
    else
      DEFAULT_CHAT_FRAME:AddMessage("|cffff9900No debuffs via GetUnitField|r")
    end
    
    -- Show ownDebuffs
    if ownDebuffs[guid] then
      DEFAULT_CHAT_FRAME:AddMessage("|cff00ff00ownDebuffs:|r")
      for spell, data in pairs(ownDebuffs[guid]) do
        local timeleft = (data.startTime + data.duration) - GetTime()
        DEFAULT_CHAT_FRAME:AddMessage(string.format("  %s: dur=%.1f left=%.1f", spell, data.duration, timeleft))
      end
    end
    
  else
    DEFAULT_CHAT_FRAME:AddMessage("|cff00ffff[libdebuff] GetUnitField Edition - Commands:|r")
    DEFAULT_CHAT_FRAME:AddMessage("  /libdebugstats start - Start debug tracking")
    DEFAULT_CHAT_FRAME:AddMessage("  /libdebugstats stop  - Stop debug tracking")
    DEFAULT_CHAT_FRAME:AddMessage("  /libdebugstats stats - Show statistics")
    DEFAULT_CHAT_FRAME:AddMessage("  /libdebugstats target - Show target debuff state")
  end
end

_G.SLASH_MEMCHECK1 = "/memcheck"
_G.SlashCmdList["MEMCHECK"] = function()
  local function countTable(t)
    local count = 0
    if not t then return 0 end
    for _ in pairs(t) do count = count + 1 end
    return count
  end
  
  local function countNestedEntries(t)
    local total = 0
    if not t then return 0 end
    for _, nested in pairs(t) do
      if type(nested) == "table" then
        total = total + countTable(nested)
      end
    end
    return total
  end
  
  DEFAULT_CHAT_FRAME:AddMessage("|cff00ffff========== LIBDEBUFF MEMORY (GetUnitField Edition) ==========|r")
  DEFAULT_CHAT_FRAME:AddMessage(string.format("|cff00ff00Primary Tables:|r"))
  DEFAULT_CHAT_FRAME:AddMessage(string.format("  ownDebuffs: %d GUIDs, %d debuffs", countTable(ownDebuffs), countNestedEntries(ownDebuffs)))
  DEFAULT_CHAT_FRAME:AddMessage(string.format("  slotOwnership: %d GUIDs, %d slots", countTable(slotOwnership), countNestedEntries(slotOwnership)))
  DEFAULT_CHAT_FRAME:AddMessage(string.format("  allAuraCasts: %d GUIDs", countTable(allAuraCasts)))
  DEFAULT_CHAT_FRAME:AddMessage(string.format("  pendingCasts: %d GUIDs", countTable(pendingCasts)))
  DEFAULT_CHAT_FRAME:AddMessage("|cff00ff00No ownSlots/allSlots (eliminated by GetUnitField approach!)|r")
  DEFAULT_CHAT_FRAME:AddMessage("|cff00ffff============================================================|r")
end