local I=game:GetService("\082\117\110\083\101\114\118\105\099\101")local G=require(script.Parent.Signal)local j=require(script.Parent.NoYield)local x=3 local h={reportReducerError=function(I,G,j)error(string.format("\082\101\099\101\105\118\101\100 \101\114\114\111\114\058 \037\115\n\n\037\115",j.message,j.thrownValue))end;reportUpdateError=function(I,G,j,x)error(string.format("\082\101\099\101\105\118\101\100 \101\114\114\111\114\058 \037\115\n\n\037\115",x.message,x.thrownValue))end}local function s(I)return debug.traceback(tostring(I))end local H={}H._flushEvent=I.Heartbeat H.__index=H function H.new(I,j,x,B)assert(typeof(I)=="\102\117\110\099\116\105\111\110","\066\097\100 \097\114\103\117\109\101\110\116 \035\049 \116\111 \083\116\111\114\101\046\110\101\119\044 \101\120\112\101\099\116\101\100 \102\117\110\099\116\105\111\110\046")assert(x==nil or typeof(x)=="\116\097\098\108\101","\066\097\100 \097\114\103\117\109\101\110\116 \035\051 \116\111 \083\116\111\114\101\046\110\101\119\044 \101\120\112\101\099\116\101\100 \110\105\108 \111\114 \116\097\098\108\101\046")if x~=nil then for I=1,#x,1 do assert(typeof(x[I])=="\102\117\110\099\116\105\111\110",("\069\120\112\101\099\116\101\100 \116\104\101 \109\105\100\100\108\101\119\097\114\101 \040\'\037\115\'\041 \097\116 \105\110\100\101\120 \037\100 \116\111 \098\101 \097 \102\117\110\099\116\105\111\110\046"):format(tostring(x[I]),I))end end local W={}W._errorReporter=B or h W._isDispatching=false W._reducer=I local M={type="\064\064\073\078\073\084"}W._actionLog={M}local k,C=xpcall(function()W._state=I(j,M)end,s)if not k then W._errorReporter.reportReducerError(j,M,{message="\067\097\117\103\104\116 \101\114\114\111\114 \105\110 \114\101\100\117\099\101\114 \119\105\116\104 \105\110\105\116";thrownValue=C})W._state=j end W._lastState=W._state W._mutatedSinceFlush=false W._connections={}W.changed=G.new(W)setmetatable(W,H)local L=W._flushEvent:Connect(function()W:flush()end)table.insert(W._connections,L)if x then local I=W.dispatch local G=function(...)return I(W,...)end for I=#x,1,-1 do local j=x[I]G=j(G,W)end W.dispatch=function(I,...)return G(...)end end return W end function H.getState(I)if I._isDispatching then error(("\089\111\117 \109\097\121 \110\111\116 \099\097\108\108 \115\116\111\114\101\058\103\101\116\083\116\097\116\101\040\041 \119\104\105\108\101 \116\104\101 \114\101\100\117\099\101\114 \105\115 \101\120\101\099\117\116\105\110\103\046 \084\104\101 \114\101\100\117\099\101\114 \040\037\115\041 \104\097\115 \097\108\114\101\097\100\121 \114\101\099\101\105\118\101\100 \116\104\101 \115\116\097\116\101 \097\115 \097\110 \097\114\103\117\109\101\110\116\046 \080\097\115\115 \105\116 \100\111\119\110 \102\114\111\109 \116\104\101 \116\111\112 \114\101\100\117\099\101\114 \105\110\115\116\101\097\100 \111\102 \114\101\097\100\105\110\103 \105\116 \102\114\111\109 \116\104\101 \115\116\111\114\101\046"):format(tostring(I._reducer)))end return I._state end function H.dispatch(G,I)if typeof(I)~="\116\097\098\108\101"then error(("\065\099\116\105\111\110\115 \109\117\115\116 \098\101 \116\097\098\108\101\115\046 \085\115\101 \099\117\115\116\111\109 \109\105\100\100\108\101\119\097\114\101 \102\111\114 \037\113 \097\099\116\105\111\110\115\046"):format(typeof(I)),2)end if I.type==nil then error("\065\099\116\105\111\110\115 \109\097\121 \110\111\116 \104\097\118\101 \097\110 \117\110\100\101\102\105\110\101\100 \'\116\121\112\101\' \112\114\111\112\101\114\116\121\046 "..("\072\097\118\101 \121\111\117 \109\105\115\115\112\101\108\108\101\100 \097 \099\111\110\115\116\097\110\116\063 \n"..tostring(I)),2)end if G._isDispatching then error("\082\101\100\117\099\101\114\115 \109\097\121 \110\111\116 \100\105\115\112\097\116\099\104 \097\099\116\105\111\110\115\046")end local j,h=pcall(function()G._isDispatching=true G._state=G._reducer(G._state,I)G._mutatedSinceFlush=true end)G._isDispatching=false if not j then G._errorReporter.reportReducerError(G._state,I,{message="\067\097\117\103\104\116 \101\114\114\111\114 \105\110 \114\101\100\117\099\101\114",thrownValue=h})end if#G._actionLog==x then table.remove(G._actionLog,1)end table.insert(G._actionLog,I)end function H.destruct(I)for I,G in ipairs(I._connections)do G:Disconnect()end I._connections=nil end function H.flush(I)if not I._mutatedSinceFlush then return end I._mutatedSinceFlush=false local G=I._state local x,h=xpcall(function()j(function()I.changed:fire(G,I._lastState)end)end,s)if not x then I._errorReporter.reportUpdateError(I._lastState,G,I._actionLog,{message="\067\097\117\103\104\116 \101\114\114\111\114 \102\108\117\115\104\105\110\103 \115\116\111\114\101 \117\112\100\097\116\101\115";thrownValue=h})end I._lastState=G end return H
local RunService = game:GetService("RunService")

local Signal = require(script.Parent.Signal)
local NoYield = require(script.Parent.NoYield)

local ACTION_LOG_LENGTH = 3

local rethrowErrorReporter = {
	reportReducerError = function(prevState, action, errorResult)
		error(string.format("Received error: %s\n\n%s", errorResult.message, errorResult.thrownValue))
	end,
	reportUpdateError = function(prevState, currentState, lastActions, errorResult)
		error(string.format("Received error: %s\n\n%s", errorResult.message, errorResult.thrownValue))
	end,
}

local function tracebackReporter(message)
	return debug.traceback(tostring(message))
end

local Store = {}

-- This value is exposed as a private value so that the test code can stay in
-- sync with what event we listen to for dispatching the Changed event.
-- It may not be Heartbeat in the future.
Store._flushEvent = RunService.Heartbeat

Store.__index = Store

--[[
	Create a new Store whose state is transformed by the given reducer function.

	Each time an action is dispatched to the store, the new state of the store
	is given by:

		state = reducer(state, action)

	Reducers do not mutate the state object, so the original state is still
	valid.
]]
function Store.new(reducer, initialState, middlewares, errorReporter)
	assert(typeof(reducer) == "function", "Bad argument #1 to Store.new, expected function.")
	assert(middlewares == nil or typeof(middlewares) == "table", "Bad argument #3 to Store.new, expected nil or table.")
	if middlewares ~= nil then
		for i = 1, #middlewares, 1 do
			assert(
				typeof(middlewares[i]) == "function",
				("Expected the middleware ('%s') at index %d to be a function."):format(tostring(middlewares[i]), i)
			)
		end
	end

	local self = {}

	self._errorReporter = errorReporter or rethrowErrorReporter
	self._isDispatching = false
	self._reducer = reducer
	local initAction = {
		type = "@@INIT",
	}
	self._actionLog = { initAction }
	local ok, result = xpcall(function()
		self._state = reducer(initialState, initAction)
	end, tracebackReporter)
	if not ok then
		self._errorReporter.reportReducerError(initialState, initAction, {
			message = "Caught error in reducer with init",
			thrownValue = result,
		})
		self._state = initialState
	end
	self._lastState = self._state

	self._mutatedSinceFlush = false
	self._connections = {}

	self.changed = Signal.new(self)

	setmetatable(self, Store)

	local connection = self._flushEvent:Connect(function()
		self:flush()
	end)
	table.insert(self._connections, connection)

	if middlewares then
		local unboundDispatch = self.dispatch
		local dispatch = function(...)
			return unboundDispatch(self, ...)
		end

		for i = #middlewares, 1, -1 do
			local middleware = middlewares[i]
			dispatch = middleware(dispatch, self)
		end

		self.dispatch = function(_self, ...)
			return dispatch(...)
		end
	end

	return self
end

--[[
	Get the current state of the Store. Do not mutate this!
]]
function Store:getState()
	if self._isDispatching then
		error(
			(
				"You may not call store:getState() while the reducer is executing. "
				.. "The reducer (%s) has already received the state as an argument. "
				.. "Pass it down from the top reducer instead of reading it from the store."
			):format(tostring(self._reducer))
		)
	end

	return self._state
end

--[[
	Dispatch an action to the store. This allows the store's reducer to mutate
	the state of the application by creating a new copy of the state.

	Listeners on the changed event of the store are notified when the state
	changes, but not necessarily on every Dispatch.
]]
function Store:dispatch(action)
	if typeof(action) ~= "table" then
		error(("Actions must be tables. " .. "Use custom middleware for %q actions."):format(typeof(action)), 2)
	end

	if action.type == nil then
		error(
			"Actions may not have an undefined 'type' property. "
				.. "Have you misspelled a constant? \n"
				.. tostring(action),
			2
		)
	end

	if self._isDispatching then
		error("Reducers may not dispatch actions.")
	end

	local ok, result = pcall(function()
		self._isDispatching = true
		self._state = self._reducer(self._state, action)
		self._mutatedSinceFlush = true
	end)

	self._isDispatching = false

	if not ok then
		self._errorReporter.reportReducerError(self._state, action, {
			message = "Caught error in reducer",
			thrownValue = result,
		})
	end

	if #self._actionLog == ACTION_LOG_LENGTH then
		table.remove(self._actionLog, 1)
	end
	table.insert(self._actionLog, action)
end

--[[
	Marks the store as deleted, disconnecting any outstanding connections.
]]
function Store:destruct()
	for _, connection in ipairs(self._connections) do
		connection:Disconnect()
	end

	self._connections = nil
end

--[[
	Flush all pending actions since the last change event was dispatched.
]]
function Store:flush()
	if not self._mutatedSinceFlush then
		return
	end

	self._mutatedSinceFlush = false

	-- On self.changed:fire(), further actions may be immediately dispatched, in
	-- which case self._lastState will be set to the most recent self._state,
	-- unless we cache this value first
	local state = self._state

	local ok, errorResult = xpcall(function()
		-- If a changed listener yields, *very* surprising bugs can ensue.
		-- Because of that, changed listeners cannot yield.
		NoYield(function()
			self.changed:fire(state, self._lastState)
		end)
	end, tracebackReporter)

	if not ok then
		self._errorReporter.reportUpdateError(self._lastState, state, self._actionLog, {
			message = "Caught error flushing store updates",
			thrownValue = errorResult,
		})
	end

	self._lastState = state
end

return Store
