local MER, F, E, I, V, P, G, L = unpack(ElvUI_MerathilisUI)
local module = MER:GetModule("MER_Tooltip")

local CreateFrame = CreateFrame
local GetCursorPosition = GetCursorPosition
local UnitCanAttack = UnitCanAttack
local UnitClass = UnitClass
local UnitExists = UnitExists
local UnitReaction = UnitReaction
local UnitIsAFK = UnitIsAFK
local UnitIsDND = UnitIsDND
local UnitIsDead = UnitIsDead
local UnitIsPlayer = UnitIsPlayer
local UnitName = UnitName
local UIParent = UIParent
local UNKNOWN = UNKNOWN

-- Fallback to GetMouseFocus
local GetMouseFocus = GetMouseFocus
if not GetMouseFocus then
	local GetMouseFoci = GetMouseFoci
	GetMouseFocus = function()
		return GetMouseFoci()[1]
	end
end

local function Getcolor()
	local reaction = UnitReaction("mouseover", "player") or 5

	if UnitIsPlayer("mouseover") then
		local _, class = UnitClass("mouseover")
		local color = E:ClassColor(class)
		return color.r, color.g, color.b
	elseif UnitCanAttack("player", "mouseover") then
		if UnitIsDead("mouseover") then
			return 136 / 255, 136 / 255, 136 / 255
		else
			if reaction < 4 then
				return 1, 68 / 255, 68 / 255
			elseif reaction == 4 then
				return 1, 1, 68 / 255
			end
		end
	else
		if reaction < 4 then
			return 48 / 255, 113 / 255, 191 / 255
		else
			return 1, 1, 1
		end
	end
end

local function AddTargetInfos(self, unit)
	local unitTarget = unit .. "target"
	if unit ~= "player" and UnitExists(unitTarget) then
		local targetColor
		if UnitIsPlayer(unitTarget) and not UnitHasVehicleUI(unitTarget) then
			local _, class = UnitClass(unitTarget)
			targetColor = E:ClassColor(class) or _G.PRIEST_COLOR
		else
			local reaction = UnitReaction(unitTarget, "player")
			targetColor = _G.FACTION_BAR_COLORS[reaction] or _G.PRIEST_COLOR
		end

		self.target:SetText(" |cffffffff>|r " .. " " .. UnitName(unitTarget))
		self.target:SetTextColor(targetColor.r, targetColor.g, targetColor.b)
	else
		self.target:SetText("")
	end
end

function module:NameHover()
	if not E.db.mui.nameHover.enable then
		return
	end

	local db = E.db.mui.nameHover
	local tooltip = CreateFrame("frame", nil)
	tooltip:SetFrameStrata("TOOLTIP")
	tooltip.text = tooltip:CreateFontString(nil, "OVERLAY")
	tooltip.text:FontTemplate(nil, db.fontSize or 7, db.fontOutline or "SHADOWOUTLINE")

	tooltip.target = tooltip:CreateFontString(nil, "OVERLAY")
	tooltip.target:FontTemplate(nil, db.fontSize or 7, db.fontOutline or "SHADOWOUTLINE")

	-- Show unit name at mouse
	tooltip:SetScript("OnUpdate", function(tt)
		if GetMouseFocus() and GetMouseFocus():IsForbidden() then
			tt:Hide()
			return
		end
		if GetMouseFocus() and GetMouseFocus():GetName() ~= "WorldFrame" then
			tt:Hide()
			return
		end
		if not UnitExists("mouseover") then
			tt:Hide()
			return
		end

		local x, y = GetCursorPosition()
		tt.text:SetPoint("CENTER", UIParent, "BOTTOMLEFT", x, y + 15)

		if db and db.targettarget then
			tt.target:SetPoint("LEFT", tt.text, "RIGHT", 0, 0)
		end
	end)

	tooltip:SetScript("OnEvent", function(tt)
		if GetMouseFocus() and GetMouseFocus():GetName() ~= "WorldFrame" then
			return
		end

		local name = UnitName("mouseover") or UNKNOWN
		local text = E:StripString(name)
		local AFK = UnitIsAFK("mouseover")
		local DND = UnitIsDND("mouseover")
		local _, UnitClass = UnitClass("mouseover")
		local reaction = UnitReaction("mouseover", "player")

		local nameHover = E.db.mui.nameHover
		local colorDB = E.db.mui.gradient

		local prefix = ""

		if AFK then
			prefix = "|cffFF9900<AFK>|r "
		end
		if DND then
			prefix = "|cffFF3333<DND>|r "
		end

		if (colorDB and colorDB.enable) and nameHover.gradient then
			if UnitIsPlayer("mouseover") and UnitClass then
				if colorDB.customColor.enable then
					tt.text:SetText(prefix .. F.GradientNameCustom(text, UnitClass))
				else
					tt.text:SetText(prefix .. F.GradientName(text, UnitClass))
				end
			else
				if reaction and reaction >= 5 then
					if colorDB.customColor.enable then
						tt.text:SetText(prefix .. F.GradientNameCustom(text, "NPCFRIENDLY"))
					else
						tt.text:SetText(prefix .. F.GradientName(text, "NPCFRIENDLY"))
					end
				elseif reaction and reaction == 4 then
					if colorDB.customColor.enable then
						tt.text:SetText(prefix .. F.GradientNameCustom(text, "NPCNEUTRAL"))
					else
						tt.text:SetText(prefix .. F.GradientName(text, "NPCNEUTRAL"))
					end
				elseif reaction and reaction == 3 then
					if colorDB.customColor.enable then
						tt.text:SetText(prefix .. F.GradientNameCustom(text, "NPCUNFRIENDLY"))
					else
						tt.text:SetText(prefix .. F.GradientName(text, "NPCUNFRIENDLY"))
					end
				elseif reaction and reaction == 2 or reaction == 1 then
					if colorDB.customColor.enable then
						tt.text:SetText(prefix .. F.GradientNameCustom(text, "NPCHOSTILE"))
					else
						tt.text:SetText(prefix .. F.GradientName(text, "NPCHOSTILE"))
					end
				end
			end
		else
			tt.text:SetText(prefix .. text)
			tt.text:SetTextColor(Getcolor())
		end

		if db and db.targettarget then
			AddTargetInfos(tt, "mouseover")
		end

		tt:Show()
	end)

	tooltip:RegisterEvent("UPDATE_MOUSEOVER_UNIT")
end

-- FIX ME 11.0
module:AddCallback("NameHover")
