local E, L, V, P, G = unpack(ElvUI)
local CoA = E:GetModule("CoA")

local FRAMES = {
	{name = "CoAResourceSegmentBar", moverText = "Resource Segment Bar", hideKey = "hideResourceSegmentBar"},
	{name = "CoAResourceOrb", moverText = "Resource Orb", hideKey = "hideResourceOrb"},
	{name = "CoAResourceBar", moverText = "Resource Bar", hideKey = "hideResourceBar"},
	{name = "CoAMultiCastActionBarFrame", moverText = "Multi Cast Action Bar", hideKey = "hideMultiCastActionBar"},
}

-- A single nil-out isn't enough: the frame's own update logic re-attaches
-- OnDragStart/OnDragStop (and re-registers drag buttons) on refresh, and
-- native dragging ends with the engine calling SetPoint directly on the
-- frame, severing the live anchor to our mover holder. So we don't just
-- clear drag once, we permanently intercept any future attempt to turn it
-- back on. The CoAClearing* guards stop our own corrective calls from
-- re-triggering these same hooks.
local function DisableDrag(frame)
	if frame.CoADragDisabled then return end
	frame.CoADragDisabled = true

	frame:SetScript("OnDragStart", nil)
	frame:SetScript("OnDragStop", nil)
	frame:RegisterForDrag()

	hooksecurefunc(frame, "SetScript", function(self, script, handler)
		if handler and (script == "OnDragStart" or script == "OnDragStop") and not self.CoAClearingDragScript then
			self.CoAClearingDragScript = true
			self:SetScript(script, nil)
			self.CoAClearingDragScript = false
		end
	end)

	hooksecurefunc(frame, "RegisterForDrag", function(self, ...)
		if select("#", ...) > 0 and not self.CoAClearingDrag then
			self.CoAClearingDrag = true
			self:RegisterForDrag()
			self.CoAClearingDrag = false
		end
	end)
end

-- Anchoring a frame while in combat lockdown can taint it, so anchors
-- queued during combat are batched and applied together on the next
-- PLAYER_REGEN_ENABLED instead of each frame registering its own handler
-- (which would stomp on each other, since AceEvent keeps only the most
-- recently registered callback per event for a given object).
local pendingAnchors = {}
local combatHandlerRegistered = false

local function QueueAnchor(fn)
	if not InCombatLockdown() then
		fn()
		return
	end

	table.insert(pendingAnchors, fn)

	if not combatHandlerRegistered then
		combatHandlerRegistered = true

		CoA:RegisterEvent("PLAYER_REGEN_ENABLED", function()
			for i = 1, #pendingAnchors do
				pendingAnchors[i]()
			end

			wipe(pendingAnchors)
			CoA:UnregisterEvent("PLAYER_REGEN_ENABLED")
			combatHandlerRegistered = false
		end)
	end
end

local function AnchorToHolder(frame, holder)
	frame:ClearAllPoints()
	frame:SetPoint("CENTER", holder, "CENTER")
end

-- Class resource frames re-anchor themselves (e.g. relative to the player/
-- target frame) whenever they refresh, which stomps our mover anchor. Since
-- there's no event that fires only for that self-repositioning, we hook
-- SetPoint itself and snap back to the holder any time something else moves
-- the frame. CoARepositioning guards against the corrective SetPoint call
-- re-triggering this same hook.
local function LockPosition(frame, holder)
	if frame.CoAPositionLocked then return end
	frame.CoAPositionLocked = true

	hooksecurefunc(frame, "SetPoint", function(self)
		if self.CoARepositioning then return end
		self.CoARepositioning = true

		QueueAnchor(function()
			AnchorToHolder(self, holder)
			self.CoARepositioning = false
		end)
	end)
end

local function SetupMover(frame, name, moverText)
	if frame.CoAMoverCreated then return true end

	local width, height = frame:GetSize()
	if width == 0 or height == 0 then return false end

	local left, bottom = frame:GetLeft(), frame:GetBottom()
	if not left or not bottom then return false end

	frame.CoAMoverCreated = true

	local holder = CreateFrame("Frame", "CoA_"..name.."Holder", E.UIParent)
	holder:Size(width, height)
	holder:Point("BOTTOMLEFT", E.UIParent, "BOTTOMLEFT", left, bottom)

	E:CreateMover(holder, "CoA_"..name.."Mover", moverText, nil, nil, nil, nil, nil, "CoA,skin,classResources")
	holder:SetAllPoints(_G["CoA_"..name.."Mover"])

	QueueAnchor(function()
		AnchorToHolder(frame, holder)
		LockPosition(frame, holder)
	end)

	return true
end

-- CoAForceHidden distinguishes frames we hid ourselves (via the options
-- checkbox) from frames the game itself decided to hide, so unchecking the
-- box only restores frames we were suppressing.
local function ApplyVisibility(frame, hideKey)
	if CoA.db.profile[hideKey] then
		frame.CoAForceHidden = true
		frame:Hide()
	elseif frame.CoAForceHidden then
		frame.CoAForceHidden = false
		frame:Show()
	end
end

local function SetupVisibility(frame, hideKey)
	if frame.CoAVisibilityHooked then return end
	frame.CoAVisibilityHooked = true

	frame:HookScript("OnShow", function(self)
		ApplyVisibility(self, hideKey)
	end)

	ApplyVisibility(frame, hideKey)
end

function CoA:UpdateClassResourceVisibility()
	for _, def in ipairs(FRAMES) do
		local frame = _G[def.name]
		if frame then
			ApplyVisibility(frame, def.hideKey)
		end
	end
end

local hooked = {}

local function TryHookAll()
	local allHooked = true

	for _, def in ipairs(FRAMES) do
		if not hooked[def.name] then
			local frame = _G[def.name]

			if frame then
				DisableDrag(frame)
				SetupVisibility(frame, def.hideKey)

				if SetupMover(frame, def.name, def.moverText) then
					hooked[def.name] = true
				else
					allHooked = false
				end
			else
				allHooked = false
			end
		end
	end

	return allHooked
end

function CoA:InitializeClassResources()
	if TryHookAll() then return end

	self.classResourcesTimer = self:ScheduleRepeatingTimer(function()
		if TryHookAll() then
			self:CancelTimer(self.classResourcesTimer)
			self.classResourcesTimer = nil
		end
	end, 0.5)
end