local TXUI, F, E, I, V, P, G = unpack((select(2, ...)))
local DM = TXUI:NewModule("SkinsDamageMeter", "AceHook-3.0")
local S = E:GetModule("Skins")
local M -- Misc module, initialized later
local GR -- Gradients module, initialized later

local _G = _G
local hooksecurefunc = hooksecurefunc
local strsplit = strsplit
local tonumber = tonumber

-- Texture paths (cached as constants)
local TEXTURE_SPEC = "Interface\\AddOns\\ElvUI_ToxiUI\\Media\\Textures\\Icons\\ToxiSpecStylized"
local TEXTURE_CLASS = "Interface\\AddOns\\ElvUI_ToxiUI\\Media\\Textures\\Icons\\ToxiClasses"

-- Pre-computed tex coord cache: [key] = { texturePath, left, right, top, bottom }
local TexCoordCache = {}

-- Parse coordinate string once and cache normalized tex coords
local function GetTexCoords(cacheKey, coordString, texturePath)
  local cached = TexCoordCache[cacheKey]
  if cached then return cached end

  local x1, x2, y1, y2 = strsplit(":", coordString)
  x1, x2, y1, y2 = tonumber(x1), tonumber(x2), tonumber(y1), tonumber(y2)

  cached = {
    texture = texturePath,
    left = x1 / 512,
    right = x2 / 512,
    top = y1 / 512,
    bottom = y2 / 512,
  }
  TexCoordCache[cacheKey] = cached
  return cached
end

local function ApplySpecIcon(content)
  if not content.Icon or not content.Icon.Icon then return end
  if not M or not M.BlizzardToSpecID then return end
  if not E.db.TXUI.addons.damageMeter.icons then return end

  local texData

  -- Priority 1: Spec icon if available
  if content.specIconID then
    local specID = M.BlizzardToSpecID[content.specIconID]
    if specID and M.SpecIcons[specID] then texData = GetTexCoords("spec_" .. specID, M.SpecIcons[specID], TEXTURE_SPEC) end
  end

  -- Priority 2: Class icon if class is known (for NPCs without spec)
  if not texData and content.classFilename and M.ClassIcons[content.classFilename] then
    texData = GetTexCoords("class_" .. content.classFilename, M.ClassIcons[content.classFilename], TEXTURE_CLASS)
  end

  if not texData then return end

  content.Icon.Icon:SetTexture(texData.texture)
  content.Icon.Icon:SetTexCoord(texData.left, texData.right, texData.top, texData.bottom)
end

-- Get class color for gradient mode
local function GetBarColor(content)
  if content.classFilename then return "classColorMap", content.classFilename end
end

-- Apply gradient colors to the status bar
local function ApplyGradient(content, _, dR, dG, dB)
  if not GR or not GR.db then return end
  if not E.db.TXUI.addons.damageMeter.gradients then return end
  if not content or not content.StatusBar then return end

  -- Set percentage for gradient calculation (always full since we can't access internal value)
  local valueChanged = content.currentPercent == nil
  if valueChanged then content.currentPercent = 1 end

  -- Get current color if not provided
  if not dB then
    local texture = content.StatusBar:GetStatusBarTexture()
    if texture then
      dR, dG, dB = texture:GetVertexColor()
    end
  end

  if not dR then return end

  local colorFunc = F.Event.GenerateClosure(GetBarColor, content)
  GR:SetGradientColors(content, valueChanged, dR, dG, dB, false, colorFunc)
end

-- Animation duration for header fade
local HEADER_FADE_DURATION = 0.3
local HEADER_FADE_EASING = "out-quintic"

-- Setup fade animation for a single frame
local function SetupFadeAnimation(frame)
  if not frame or frame.txuiFadeAnim then return end

  frame.txuiFadeAnim = TXUI:CreateAnimationGroup(frame):CreateAnimation("Fade")
  frame.txuiFadeAnim:SetDuration(HEADER_FADE_DURATION)
  frame.txuiFadeAnim:SetEasing(HEADER_FADE_EASING)
end

-- Animate alpha on a single frame
local function AnimateAlpha(frame, alpha)
  if not frame or not frame.txuiFadeAnim then return end

  -- Stop any running animation
  if frame.txuiFadeAnim:IsPlaying() then frame.txuiFadeAnim:Stop() end

  frame.txuiFadeAnim:SetChange(alpha)
  frame.txuiFadeAnim:Play()
end

-- Animate alpha on all header elements
local function AnimateHeaderAlpha(window, alpha)
  if window.headerBackdrop then AnimateAlpha(window.headerBackdrop, alpha) end
  if window.DamageMeterTypeDropdown then AnimateAlpha(window.DamageMeterTypeDropdown, alpha) end
  if window.SessionDropdown then AnimateAlpha(window.SessionDropdown, alpha) end
  if window.SettingsDropdown then AnimateAlpha(window.SettingsDropdown, alpha) end
end

-- Set alpha immediately on all header elements (no animation)
local function SetHeaderAlpha(window, alpha)
  if window.headerBackdrop then window.headerBackdrop:SetAlpha(alpha) end
  if window.DamageMeterTypeDropdown then window.DamageMeterTypeDropdown:SetAlpha(alpha) end
  if window.SessionDropdown then window.SessionDropdown:SetAlpha(alpha) end
  if window.SettingsDropdown then window.SettingsDropdown:SetAlpha(alpha) end
end

local function SkinHeader(window)
  if not window or not window.headerBackdrop then return end
  if not E.db.TXUI.addons.damageMeter.headerFade then return end
  if window.txuiHeaderHooked then return end
  window.txuiHeaderHooked = true

  local db = E.db.TXUI.addons.damageMeter

  -- Setup fade animations for each header element
  SetupFadeAnimation(window.headerBackdrop)
  SetupFadeAnimation(window.DamageMeterTypeDropdown)
  SetupFadeAnimation(window.SessionDropdown)
  SetupFadeAnimation(window.SettingsDropdown)

  -- Set initial alpha to hidden (no animation on initial setup)
  SetHeaderAlpha(window, db.headerFadeMinAlpha)

  -- OnEnter: animate header to full alpha
  window:HookScript("OnEnter", function()
    AnimateHeaderAlpha(window, db.headerFadeMaxAlpha)
  end)

  -- OnLeave: animate header to low alpha (only if mouse truly left the window)
  window:HookScript("OnLeave", function()
    if window:IsMouseOver() then return end
    AnimateHeaderAlpha(window, db.headerFadeMinAlpha)
  end)
end

-- Hook into ElvUI's S:DamageMeter_HandleStatusBar for each meter bar
local function SkinMeter(content)
  if not content or not content.StatusBar then return end
  if content.txuiHooked then return end
  content.txuiHooked = true

  -- Hook UpdateIcon for future updates and apply immediately
  if content.UpdateIcon then hooksecurefunc(content, "UpdateIcon", ApplySpecIcon) end
  ApplySpecIcon(content)

  -- Hook for gradient mode (works with any theme)
  if E.db.TXUI.addons.damageMeter.gradients then
    local texture = content.StatusBar:GetStatusBarTexture()
    if texture and not DM:IsHooked(texture, "SetVertexColor") then
      -- Set gradient properties on the content frame
      content.fadeMode = I.Enum.GradientMode.Mode[I.Enum.GradientMode.Mode.HORIZONTAL]
      content.fadeDirection = I.Enum.GradientMode.Direction.RIGHT

      DM:RawHook(texture, "SetVertexColor", F.Event.GenerateClosure(ApplyGradient, content), true)
    end
    ApplyGradient(content)
  end
end

function DM:Initialize()
  if self.Initialized then return end

  F.Event.RegisterOnceCallback("TXUI.InitializedSafe", function()
    -- Check requirements and if module is enabled
    if not TXUI:HasRequirements(I.Requirements.DamageMeter) then return end
    if not E.db.TXUI.addons.damageMeter.enabled then return end

    -- Get modules now that everything is loaded
    M = TXUI:GetModule("Misc")
    GR = TXUI:GetModule("ThemesGradients")

    hooksecurefunc(S, "DamageMeter_HandleStatusBar", SkinMeter)

    F.Event.ContinueOnAddOnLoaded("Blizzard_DamageMeter", function()
      if not _G.DamageMeter then return end

      -- Apply header mouseover to existing session windows
      _G.DamageMeter:ForEachSessionWindow(function(window)
        SkinHeader(window)
      end)

      E:Delay(0.1, function()
        _G.DamageMeter:RefreshLayout()
      end)

      -- Enable and show the damage meter
      local isDamageMeterEnabled = C_CVar.GetCVarBool("damageMeterEnabled")
      if not isDamageMeterEnabled then
        C_CVar.SetCVar("damageMeterEnabled", "1")
        _G.DamageMeter:Show()
      end
    end)
  end)

  self.Initialized = true
end

if TXUI.IsRetail then TXUI:RegisterModule(DM:GetName()) end
