local U=require(script.Parent.Parent.vendor.RoactHooked)local G=require(script.Parent.useStore)local function F(U,G)return U==G end local function u(u,t)if t==nil then t=F end local N,C=U.useReducer(function(U)return U+1 end,0)local D=G()local m=U.useMutable()local S=U.useMutable()local O=U.useMutable()local n=U.useMutable()local P=D:getState()local g local z,c=pcall(function()if u~=S.current or P~=O.current or m.current then local U=u(P)if n.current==nil or not t(U,n.current)then g=U else g=n.current end else g=n.current end end)if not z then if m.current then c..="\n\084\104\101 \101\114\114\111\114 \109\097\121 \098\101 \099\111\114\114\101\108\097\116\101\100 \119\105\116\104 \116\104\105\115 \112\114\101\118\105\111\117\115 \101\114\114\111\114\058\n"..(m.current.."\n\n")error(c)end end U.useEffect(function()S.current=u O.current=P n.current=g m.current=nil end)U.useEffect(function()local function U(U)local G,F=pcall(function()if U==O.current then return false end local G=S.current(U)if t(G,n.current)then return false end n.current=G O.current=U return true end)if not G then m.current=F elseif F then task.spawn(C)end end local G=D.changed:connect(U)U(P)return function()G:disconnect()end end,{D})return g end return u
-- https://github.com/reduxjs/react-redux/blob/7.x/src/hooks/useSelector.js

local Hooks = require(script.Parent.Parent.vendor.RoactHooked)
local useStore = require(script.Parent.useStore)

local function refEquality(a, b)
	return a == b
end

local function useSelector(selector, isEqual)
	if isEqual == nil then
		isEqual = refEquality
	end

	local _, forceRender = Hooks.useReducer(function(n)
		return n + 1
	end, 0)

	local store = useStore()

	local latestSubscriptionCallbackError = Hooks.useMutable()
	local latestSelector = Hooks.useMutable()
	local latestStoreState = Hooks.useMutable()
	local latestSelectedState = Hooks.useMutable()

	local storeState = store:getState()
	local selectedState

	local success, err = pcall(function()
		if 
			selector ~= latestSelector.current or
			storeState ~= latestStoreState.current or
			latestSubscriptionCallbackError.current
		then
			local newSelectedState = selector(storeState)

			-- ensure latest selected state is reused so that a custom equality
			-- function can result in identical references
			if
				latestSelectedState.current == nil or
				not isEqual(newSelectedState, latestSelectedState.current)
			then
				selectedState = newSelectedState
			else
				selectedState = latestSelectedState.current
			end
		else
			selectedState = latestSelectedState.current
		end
	end)

	if not success then
		if latestSubscriptionCallbackError.current then
			err ..= (
				"\nThe error may be correlated with this previous error:\n" ..
				latestSubscriptionCallbackError.current ..
				"\n\n"
			)

			error(err)
		end
	end

	Hooks.useEffect(function()
		latestSelector.current = selector
		latestStoreState.current = storeState
		latestSelectedState.current = selectedState
		latestSubscriptionCallbackError.current = nil
	end)

	Hooks.useEffect(function()
		local function checkForUpdates(newStoreState)
			local success, shouldRender = pcall(function()
				-- Avoid calling selector multiple times if the store's state has not changed
				if newStoreState == latestStoreState.current then
					return false
				end

				local newSelectedState = latestSelector.current(newStoreState)

				if isEqual(newSelectedState, latestSelectedState.current) then
					return false
				end

				latestSelectedState.current = newSelectedState
				latestStoreState.current = newStoreState

				return true
			end)

			if not success then
				-- we ignore all errors here, since when the component
				-- is re-rendered, the selectors are called again, and
				-- will throw again, if neither props nor store state
				-- changed
				latestSubscriptionCallbackError.current = shouldRender
			elseif shouldRender then
				-- pcall will not block this rerender in the guard clauses,
				-- so use the returned boolean value to decide
				task.spawn(forceRender)
			end
		end

		local subscription = store.changed:connect(checkForUpdates)

		checkForUpdates(storeState)

		return function()
			subscription:disconnect()
		end
	end, { store })

	return selectedState
end

return useSelector
