local U=require(script.Parent.createSignal)local k=require(script.Parent.Symbol)local z=require(script.Parent.Type)local d=(require(script.Parent.GlobalConfig)).get()local m=k.named("\066\105\110\100\105\110\103\073\109\112\108")local a={}local r={}function r.getValue(U)return a.getValue(U)end function r.map(k,U)return a.map(k,U)end local q={__index=r,__tostring=function(U)return string.format("\082\111\097\099\116\066\105\110\100\105\110\103\040\037\115\041",tostring(U:getValue()))end}function a.update(U,k)return U[m].update(k)end function a.subscribe(U,k)return U[m].subscribe(k)end function a.getValue(U)return U[m].getValue()end function a.create(k)local d={value=k,changeSignal=U()}function d.subscribe(U)return d.changeSignal:subscribe(U)end function d.update(U)d.value=U d.changeSignal:fire(U)end function d.getValue()return d.value end return setmetatable({[z]=z.Binding,[m]=d},q),d.update end function a.map(U,k)if d.typeChecks then assert(z.of(U)==z.Binding,"\069\120\112\101\099\116\101\100 \097\114\103 \035\049 \116\111 \098\101 \097 \098\105\110\100\105\110\103")assert(typeof(k)=="\102\117\110\099\116\105\111\110","\069\120\112\101\099\116\101\100 \097\114\103 \035\049 \116\111 \098\101 \097 \102\117\110\099\116\105\111\110")end local r={}function r.subscribe(z)return a.subscribe(U,function(U)z(k(U))end)end function r.update(U)error("\066\105\110\100\105\110\103\115 \099\114\101\097\116\101\100 \098\121 \066\105\110\100\105\110\103\058\109\097\112\040\102\110\041 \099\097\110\110\111\116 \098\101 \117\112\100\097\116\101\100 \100\105\114\101\099\116\108\121",2)end function r.getValue()return k(U:getValue())end return setmetatable({[z]=z.Binding;[m]=r},q)end function a.join(U)if d.typeChecks then assert(typeof(U)=="\116\097\098\108\101","\069\120\112\101\099\116\101\100 \097\114\103 \035\049 \116\111 \098\101 \111\102 \116\121\112\101 \116\097\098\108\101")for U,k in pairs(U)do if z.of(k)~=z.Binding then local k=("\069\120\112\101\099\116\101\100 \097\114\103 \035\049 \116\111 \099\111\110\116\097\105\110 \111\110\108\121 \098\105\110\100\105\110\103\115\044 \098\117\116 \107\101\121 \037\113 \104\097\100 \097 \110\111\110-\098\105\110\100\105\110\103 \118\097\108\117\101"):format(tostring(U))error(k,2)end end end local k={}local function r()local k={}for U,z in pairs(U)do k[U]=z:getValue()end return k end function k.subscribe(k)local z={}for U,d in pairs(U)do z[U]=a.subscribe(d,function(U)k(r())end)end return function()if z==nil then return end for U,k in pairs(z)do k()end z=nil end end function k.update(U)error("\066\105\110\100\105\110\103\115 \099\114\101\097\116\101\100 \098\121 \106\111\105\110\066\105\110\100\105\110\103\115\040\046\046\046\041 \099\097\110\110\111\116 \098\101 \117\112\100\097\116\101\100 \100\105\114\101\099\116\108\121",2)end function k.getValue()return r()end return setmetatable({[z]=z.Binding;[m]=k},q)end return a
local createSignal = require(script.Parent.createSignal)
local Symbol = require(script.Parent.Symbol)
local Type = require(script.Parent.Type)

local config = require(script.Parent.GlobalConfig).get()

local BindingImpl = Symbol.named("BindingImpl")

local BindingInternalApi = {}

local bindingPrototype = {}

function bindingPrototype:getValue()
	return BindingInternalApi.getValue(self)
end

function bindingPrototype:map(predicate)
	return BindingInternalApi.map(self, predicate)
end

local BindingPublicMeta = {
	__index = bindingPrototype,
	__tostring = function(self)
		return string.format("RoactBinding(%s)", tostring(self:getValue()))
	end,
}

function BindingInternalApi.update(binding, newValue)
	return binding[BindingImpl].update(newValue)
end

function BindingInternalApi.subscribe(binding, callback)
	return binding[BindingImpl].subscribe(callback)
end

function BindingInternalApi.getValue(binding)
	return binding[BindingImpl].getValue()
end

function BindingInternalApi.create(initialValue)
	local impl = {
		value = initialValue,
		changeSignal = createSignal(),
	}

	function impl.subscribe(callback)
		return impl.changeSignal:subscribe(callback)
	end

	function impl.update(newValue)
		impl.value = newValue
		impl.changeSignal:fire(newValue)
	end

	function impl.getValue()
		return impl.value
	end

	return setmetatable({
		[Type] = Type.Binding,
		[BindingImpl] = impl,
	}, BindingPublicMeta), impl.update
end

function BindingInternalApi.map(upstreamBinding, predicate)
	if config.typeChecks then
		assert(Type.of(upstreamBinding) == Type.Binding, "Expected arg #1 to be a binding")
		assert(typeof(predicate) == "function", "Expected arg #1 to be a function")
	end

	local impl = {}

	function impl.subscribe(callback)
		return BindingInternalApi.subscribe(upstreamBinding, function(newValue)
			callback(predicate(newValue))
		end)
	end

	function impl.update(_newValue)
		error("Bindings created by Binding:map(fn) cannot be updated directly", 2)
	end

	function impl.getValue()
		return predicate(upstreamBinding:getValue())
	end

	return setmetatable({
		[Type] = Type.Binding,
		[BindingImpl] = impl,
	}, BindingPublicMeta)
end

function BindingInternalApi.join(upstreamBindings)
	if config.typeChecks then
		assert(typeof(upstreamBindings) == "table", "Expected arg #1 to be of type table")

		for key, value in pairs(upstreamBindings) do
			if Type.of(value) ~= Type.Binding then
				local message = ("Expected arg #1 to contain only bindings, but key %q had a non-binding value"):format(
					tostring(key)
				)
				error(message, 2)
			end
		end
	end

	local impl = {}

	local function getValue()
		local value = {}

		for key, upstream in pairs(upstreamBindings) do
			value[key] = upstream:getValue()
		end

		return value
	end

	function impl.subscribe(callback)
		local disconnects = {}

		for key, upstream in pairs(upstreamBindings) do
			disconnects[key] = BindingInternalApi.subscribe(upstream, function(_newValue)
				callback(getValue())
			end)
		end

		return function()
			if disconnects == nil then
				return
			end

			for _, disconnect in pairs(disconnects) do
				disconnect()
			end

			disconnects = nil
		end
	end

	function impl.update(_newValue)
		error("Bindings created by joinBindings(...) cannot be updated directly", 2)
	end

	function impl.getValue()
		return getValue()
	end

	return setmetatable({
		[Type] = Type.Binding,
		[BindingImpl] = impl,
	}, BindingPublicMeta)
end

return BindingInternalApi
