local c={}for u in pairs(defaultConfig)do table.insert(c,u)end local u={}function u.new()local p={}p._currentConfig=setmetatable({},{__index=function(u,p)local K=("\073\110\118\097\108\105\100 \103\108\111\098\097\108 \099\111\110\102\105\103\117\114\097\116\105\111\110 \107\101\121 \037\113\046 \086\097\108\105\100 \099\111\110\102\105\103\117\114\097\116\105\111\110 \107\101\121\115 \097\114\101\058 \037\115"):format(tostring(p),table.concat(c,"\044 "))error(K,3)end})p.set=function(...)return u.set(p,...)end p.get=function(...)return u.get(p,...)end p.scoped=function(...)return u.scoped(p,...)end p.set(defaultConfig)return p end function u.set(p,u)for u,K in pairs(u)do if defaultConfig[u]==nil then local p=("\073\110\118\097\108\105\100 \103\108\111\098\097\108 \099\111\110\102\105\103\117\114\097\116\105\111\110 \107\101\121 \037\113 \040\116\121\112\101 \037\115\041\046 \086\097\108\105\100 \099\111\110\102\105\103\117\114\097\116\105\111\110 \107\101\121\115 \097\114\101\058 \037\115"):format(tostring(u),typeof(u),table.concat(c,"\044 "))error(p,3)end if typeof(K)~="\098\111\111\108\101\097\110"then local c=("\073\110\118\097\108\105\100 \118\097\108\117\101 \037\113 \040\116\121\112\101 \037\115\041 \102\111\114 \103\108\111\098\097\108 \099\111\110\102\105\103\117\114\097\116\105\111\110 \107\101\121 \037\113\046 \086\097\108\105\100 \118\097\108\117\101\115 \097\114\101\058 \116\114\117\101\044 \102\097\108\115\101"):format(tostring(K),typeof(K),tostring(u))error(c,3)end p._currentConfig[u]=K end end function u.get(c)return c._currentConfig end function u.scoped(p,c,u)local K={}for c,u in pairs(p._currentConfig)do K[c]=u end p.set(c)local C,L=pcall(u)p.set(K)assert(C,L)end return u

local defaultConfigKeys = {}
for key in pairs(defaultConfig) do
	table.insert(defaultConfigKeys, key)
end

local Config = {}

function Config.new()
	local self = {}

	self._currentConfig = setmetatable({}, {
		__index = function(_, key)
			local message = ("Invalid global configuration key %q. Valid configuration keys are: %s"):format(
				tostring(key),
				table.concat(defaultConfigKeys, ", ")
			)

			error(message, 3)
		end,
	})

	-- We manually bind these methods here so that the Config's methods can be
	-- used without passing in self, since they eventually get exposed on the
	-- root Roact object.
	self.set = function(...)
		return Config.set(self, ...)
	end

	self.get = function(...)
		return Config.get(self, ...)
	end

	self.scoped = function(...)
		return Config.scoped(self, ...)
	end

	self.set(defaultConfig)

	return self
end

function Config:set(configValues)
	-- Validate values without changing any configuration.
	-- We only want to apply this configuration if it's valid!
	for key, value in pairs(configValues) do
		if defaultConfig[key] == nil then
			local message = ("Invalid global configuration key %q (type %s). Valid configuration keys are: %s"):format(
				tostring(key),
				typeof(key),
				table.concat(defaultConfigKeys, ", ")
			)

			error(message, 3)
		end

		-- Right now, all configuration values must be boolean.
		if typeof(value) ~= "boolean" then
			local message = (
				"Invalid value %q (type %s) for global configuration key %q. Valid values are: true, false"
			):format(tostring(value), typeof(value), tostring(key))

			error(message, 3)
		end

		self._currentConfig[key] = value
	end
end

function Config:get()
	return self._currentConfig
end

function Config:scoped(configValues, callback)
	local previousValues = {}
	for key, value in pairs(self._currentConfig) do
		previousValues[key] = value
	end

	self.set(configValues)

	local success, result = pcall(callback)

	self.set(previousValues)

	assert(success, result)
end

return Config
