local listeners = {}
-- listeners is a table that holds arrays of listener objects
-- Ex - listeners["login"] = { Listener , Listener, Listener }

local function createListener(idString, callbackFunction)
	local Listener = {
		id = idString,
		callback = callbackFunction
	}

	return Listener
end

-- Initialize all the functions for the EventHub
local EventHub = {}
do
	function EventHub:addEventListener(eventString, objectIDString, callbackFunction)
		if (listeners[eventString] == nil) then
			listeners[eventString] = {}
		end

		table.insert(listeners[eventString], createListener(objectIDString, callbackFunction))
	end

	function EventHub:removeEventListener(eventString, objectIDString)
		if (listeners[eventString] == nil) then return end

		-- iterate through the listeners for an event string, remove all of the listeners with the provided objectIDString
		for key, value in ipairs(listeners[eventString]) do
			local listener = value
			if (listener ~= nil) then
				if (listener.id == objectIDString) then
					table.remove(listeners[eventString], key)
				end
			end
		end
	end

	function EventHub:removeCallbackFromEvent(eventString, objectIDString, callbackFunction)
		-- NOTE- Will not work with anonymous functions
		if (listeners[eventString] == nil) then return end

		-- iterate through the listeners for an event string, remove the one with the provided objectIDString and callback function
		for key, value in ipairs(listeners[eventString]) do
			local listener = value
			if (listener ~= nil) then
				if (listener.id == objectIDString) and (listener.callback == callbackFunction) then
					table.remove(listeners[eventString], key)
					break
				end
			end
		end
	end

	function EventHub:dispatchEvent(eventString, ...)
		if (listeners[eventString] == nil) then
			return
		end

		-- loop through all the listeners and call the callback function
		for _, value in ipairs(listeners[eventString]) do
			value.callback(...)
		end
	end


	-- A comprehensive list of notification strings to read from
	EventHub.Notifications = {
		AuthenticationSuccess = "rbxNotificationAuthenticationSuccess",
		GameJoin = "rbxNotificationGameJoin",
		OpenGames = "rbxNotificationOpenGames",
		OpenGameDetail = "rbxNotificationOpenGameDetail",
		OpenGameGenre = "rbxNotificationOpenGameGenre",
		OpenBadgeScreen = "rbxNotificationOpenBadgeScreen",
		OpenSettingsScreen = "rbxNotificationOpenSettingsScreen",
		OpenAvatarEditorScreen = "rbxNotificationOpenAvatarEditorScreen",
		OpenAccountSettingsScreen = "rbxNotificationOpenAccountSettingsScreen",
		NavigateToEquippedAvatar = "rbxNotificationNavigateToEquippedAvatar",
		NavigateToRobuxScreen = "rbxNotificationNavigateToRobuxScreen",
		RobuxCatalogPurchaseInitiated = "rbxRobuxCatalogPurchaseInitiated",
		DonnedDifferentPackage = "rbxDonnedDifferentPackage",
		VotedOnPlace = "rbxVotedOnPlace",
		AvatarEquipBegin = "rbxAvatarEquipBegin",
		DonnedDifferentOutfit = "rbxDonnedDifferentOutfit",
		AvatarEquipSuccess = "rbxAvatarEquipSuccess",
		AvatarPurchaseBegin = "rbxAvatarPurchaseBegin",
		AvatarPurchaseSuccess = "rbxAvatarPurchaseSuccess",
		FavoriteToggle = "rbxFavoriteToggle",
		PlayedGamesChanged = "rbxPlayedGamesChanged",
		UnlockedUGC = "rbxNotificationUnlockedUGC",

		--Add for avatar editor equip/update
		CharacterEquipped = "CharacterEquipped",
		CharacterUpdated = "CharacterUpdated",
	}
end

return EventHub