local i=require(script.Parent.createSignal)local W=require(script.Parent.Symbol)local K=require(script.Parent.Type)local D=(require(script.Parent.GlobalConfig)).get()local u=W.named("\066\105\110\100\105\110\103\073\109\112\108")local J={}local G={}function G.getValue(i)return J.getValue(i)end function G.map(W,i)return J.map(W,i)end local e={__index=G,__tostring=function(i)return string.format("\082\111\097\099\116\066\105\110\100\105\110\103\040\037\115\041",tostring(i:getValue()))end}function J.update(i,W)return i[u].update(W)end function J.subscribe(i,W)return i[u].subscribe(W)end function J.getValue(i)return i[u].getValue()end function J.create(W)local D={value=W;changeSignal=i()}function D.subscribe(i)return D.changeSignal:subscribe(i)end function D.update(i)D.value=i D.changeSignal:fire(i)end function D.getValue()return D.value end return setmetatable({[K]=K.Binding,[u]=D},e),D.update end function J.map(i,W)if D.typeChecks then assert(K.of(i)==K.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(W)=="\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 G={}function G.subscribe(K)return J.subscribe(i,function(i)K(W(i))end)end function G.update(i)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 G.getValue()return W(i:getValue())end return setmetatable({[K]=K.Binding,[u]=G},e)end function J.join(i)if D.typeChecks then assert(typeof(i)=="\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 i,W in pairs(i)do if K.of(W)~=K.Binding then local W=("\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(i))error(W,2)end end end local W={}local function G()local W={}for i,K in pairs(i)do W[i]=K:getValue()end return W end function W.subscribe(W)local K={}for i,D in pairs(i)do K[i]=J.subscribe(D,function(i)W(G())end)end return function()if K==nil then return end for i,W in pairs(K)do W()end K=nil end end function W.update(i)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 W.getValue()return G()end return setmetatable({[K]=K.Binding;[u]=W},e)end return J
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