local N=require(script.Parent.Parent.Symbol)local R=require(script.Parent.createSignal)local z=require(script.Parent.Type)local V=(require(script.Parent.GlobalConfig)).get()local x=N("\066\105\110\100\105\110\103\073\109\112\108")local b={}local q={}function q.getValue(N)return b.getValue(N)end function q.map(R,N)return b.map(R,N)end local K={__index=q,__tostring=function(N)return string.format("\082\111\097\099\116\066\105\110\100\105\110\103\040\037\115\041",tostring(N:getValue()))end}function b.update(N,R)return N[x].update(R)end function b.subscribe(N,R)return N[x].subscribe(R)end function b.getValue(N)return N[x].getValue()end function b.create(N)local V={value=N;changeSignal=R()}function V.subscribe(N)return V.changeSignal:subscribe(N)end function V.update(N)V.value=N V.changeSignal:fire(N)end function V.getValue()return V.value end return setmetatable({[z]=z.Binding,[x]=V},K),V.update end function b.map(N,R)if V.typeChecks then if z.of(N)~=z.Binding then error("\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",2)elseif type(R)~="\102\117\110\099\116\105\111\110"then error("\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",2)end end local q={}function q.subscribe(z)return b.subscribe(N,function(N)z(R(N))end)end function q.update(N)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 q.getValue()return R(N:getValue())end return setmetatable({[z]=z.Binding,[x]=q},K)end function b.join(N)if V.typeChecks then if type(N)~="\116\097\098\108\101"then error("\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")end for N,R in N do if z.of(R)~=z.Binding then error(("\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(N)),2)end end end local R={}local function q()local R={}for N,z in N do R[N]=z:getValue()end return R end function R.subscribe(R)local z={}for N,V in N do z[N]=b.subscribe(V,function(N)R(q())end)end return function()if z==nil then return end for N,R in z do R()end z=nil end end function R.update(N)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 R.getValue()return q()end return setmetatable({[z]=z.Binding,[x]=R},K)end return b
local Symbol = require(script.Parent.Parent.Symbol)

local createSignal = require(script.Parent.createSignal)
local Type = require(script.Parent.Type)

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

local BindingImpl = Symbol("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
		if Type.of(upstreamBinding) ~= Type.Binding then
			error("Expected arg #1 to be a binding", 2)
		elseif type(predicate) ~= "function" then
			error("Expected arg #1 to be a function", 2)
		end
	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
		if type(upstreamBindings) ~= "table" then
			error("Expected arg #1 to be of type table")
		end

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

	local impl = {}

	local function getValue()
		local value = {}

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

		return value
	end

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

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

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

			for _, disconnect in 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
