local O=game:GetService("\082\117\110\083\101\114\118\105\099\101")local Z=require(script.Parent.Signal)local p=require(script.Parent.NoYield)local j={}j._flushEvent=O.Heartbeat j.__index=j function j.new(O,p,N)assert(typeof(O)=="\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(N==nil or typeof(N)=="\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")local T={}T._reducer=O T._state=O(p,{type="\064\064\073\078\073\084"})T._lastState=T._state T._mutatedSinceFlush=false T._connections={}T.changed=Z.new()setmetatable(T,j)local c=T._flushEvent:Connect(function()T:flush()end)table.insert(T._connections,c)if N then local O=T.dispatch local Z=function(...)return O(T,...)end for O=#N,1,-1 do local p=N[O]Z=p(Z,T)end T.dispatch=function(O,...)return Z(...)end end return T end function j.getState(O)return O._state end function j.dispatch(Z,O)if typeof(O)=="\116\097\098\108\101"then if O.type==nil then error("\097\099\116\105\111\110 \100\111\101\115 \110\111\116 \104\097\118\101 \097 \116\121\112\101 \102\105\101\108\100",2)end Z._state=Z._reducer(Z._state,O)Z._mutatedSinceFlush=true else error(("\097\099\116\105\111\110\115 \111\102 \116\121\112\101 \037\113 \097\114\101 \110\111\116 \112\101\114\109\105\116\116\101\100"):format(typeof(O)),2)end end function j.destruct(O)for O,Z in ipairs(O._connections)do Z:Disconnect()end O._connections=nil end function j.flush(O)if not O._mutatedSinceFlush then return end O._mutatedSinceFlush=false local Z=O._state p(function()O.changed:fire(Z,O._lastState)end)O._lastState=Z end return j
local RunService = game:GetService("RunService")

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

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)
	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.")

	local self = {}

	self._reducer = reducer
	self._state = reducer(initialState, {
		type = "@@INIT",
	})
	self._lastState = self._state

	self._mutatedSinceFlush = false
	self._connections = {}

	self.changed = Signal.new()

	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()
	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
		if action.type == nil then
			error("action does not have a type field", 2)
		end

		self._state = self._reducer(self._state, action)
		self._mutatedSinceFlush = true
	else
		error(("actions of type %q are not permitted"):format(typeof(action)), 2)
	end
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

	-- 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)

	self._lastState = state
end

return Store
