local h=script.Parent local C=script.Parent.Parent local A=require(C.Fusion)local t=require(h.Route.deconstructRoute)local B=require(h.Route.formatPath)local E=require(h.Meta.doesMetaContainForbiddenValue)local n=A.Value local c=A.Observer local i=A.Children local p={type="\114\111\117\116\101\114"}p.__index=p local U=1 local function g(h,C,A)h.serving.path:set(C.path)h.serving.meta:set(C.meta)h.serving.params=A h.serving.view:set(C.view)end local function k(h)local C={}table.insert(C,h)if h[i]then for h,A in h[i]do for h,A in k(A)do table.insert(C,A)end end end for h,C in C do C[i]=nil end return C end function p.set(t,h,C,A)if A=="\103\111"and U~=#t.history then for h=U+1,#t.history,1 do table.remove(t.history,h)end U=#t.history end g(t,h,C)if A=="\103\111"then U+=1 local A=table.clone(h)A.params=C table.insert(t.history,A)end end function p.go(A,h,C)local t=A.routes[B(h)]assert(t,"\116\104\105\115 \114\111\117\116\101 \100\111\101\115 \110\111\116 \101\120\105\115\116")A:set(t,C or{},"\103\111")end function p.back(C,h)h=h or 1 local A=C.history[U-h]assert(A,"\104\105\115\116\111\114\121 \114\111\117\116\101 \100\111\101\115 \110\111\116 \101\120\105\115\116")U=#C.history-h C:set(A,A.params,"\098\097\099\107")end return function(h)local C=setmetatable({history={},serving={path=n(""),view=n();meta=n({}),params={}},routes={}},p)for h,A in h.routes do t(A)for h,A in k(A)do C.routes[A.path]=A end end;(c(C.serving.meta)):onChange(function()for h,C in C.serving.meta:get()do E(C)end end)return C end
local Koute = script.Parent
local Packages = script.Parent.Parent


local Fusion = require(Packages.Fusion)
local deconstructRoute = require(Koute.Route.deconstructRoute)
local formatPath = require(Koute.Route.formatPath)
local doesMetaContainForbiddenValue = require(Koute.Meta.doesMetaContainForbiddenValue)

local Value = Fusion.Value
local Observer = Fusion.Observer
local Children = Fusion.Children

local class = {
	type = "router",
}
class.__index = class
local currentlyAt = 1

local function updateServing(class, route, params)
	class.serving.path:set(route.path)
	class.serving.meta:set(route.meta)
	class.serving.params = params
	class.serving.view:set(route.view)
end

local function unpackRoutes(route)
	local routes = {}
	table.insert(routes, route)

	if route[Children] then
		for _, child in route[Children] do
			for _, child in unpackRoutes(child) do
				table.insert(routes, child)
			end
		end
	end

	for _, route in routes do
		route[Children] = nil
	end
	
	return routes
end

function class:set(route, params, direction)
	if direction == "go" and currentlyAt ~= #self.history then
		for i = currentlyAt + 1, #self.history do
			table.remove(self.history, i)
		end
		currentlyAt = #self.history
	end

	updateServing(self, route, params)

	if direction == "go" then
		currentlyAt += 1
		local archivedRoute = table.clone(route)
		archivedRoute.params = params
		table.insert(self.history, archivedRoute)
	end
end

function class:go(path, params)
	local route = self.routes[formatPath(path)]
	assert(route, "this route does not exist")
	self:set(route, params or {}, "go")
end

function class:back(level)
	level = level or 1
	local route = self.history[currentlyAt - level]
	assert(route, "history route does not exist")
	currentlyAt = #self.history - level
	self:set(route, route.params, "back")
end

return function(params)
	local router = setmetatable({
		history = {},
		serving = {
			path = Value(""),
			view = Value(),
			meta = Value({}),
			params = {},
		},
		routes = {},
	}, class)
	for _, route in params.routes do
		deconstructRoute(route)
		for _, route in unpackRoutes(route) do
			router.routes[route.path] = route
		end
	end

	Observer(router.serving.meta):onChange(function()
		for _, meta in router.serving.meta:get() do
			doesMetaContainForbiddenValue(meta)
		end
	end)

	return router
end
