----- Private functions -----


local function IdentifyProfile(store_name, store_scope, key)
	return string.format(
		"[Store:\"%s\";%sKey:\"%s\"]",
		store_name,
		store_scope ~= nil and string.format("Scope:\"%s\";", store_scope) or "",
		key
	)
end

local function CustomWriteQueueCleanup(store, key)
	if CustomWriteQueue[store] ~= nil then
		CustomWriteQueue[store][key] = nil
		if next(CustomWriteQueue[store]) == nil then
			CustomWriteQueue[store] = nil
		end
	end
end

local function CustomWriteQueueMarkForCleanup(store, key)
	if CustomWriteQueue[store] ~= nil then
		if CustomWriteQueue[store][key] ~= nil then

			local queue_data = CustomWriteQueue[store][key]
			local queue = queue_data.Queue

			if queue_data.CleanupJob == nil then

				queue_data.CleanupJob = RunService.Heartbeat:Connect(function()
					if os.clock() - queue_data.LastWrite > SETTINGS.RobloxWriteCooldown and #queue == 0 then
						queue_data.CleanupJob:Disconnect()
						CustomWriteQueueCleanup(store, key)
					end
				end)

			end

		elseif next(CustomWriteQueue[store]) == nil then
			CustomWriteQueue[store] = nil
		end
	end
end

local function CustomWriteQueueAsync(callback, store, key) --> ... -- Passed return from callback

	if CustomWriteQueue[store] == nil then
		CustomWriteQueue[store] = {}
	end
	if CustomWriteQueue[store][key] == nil then
		CustomWriteQueue[store][key] = {LastWrite = 0, Queue = {}, CleanupJob = nil}
	end

	local queue_data = CustomWriteQueue[store][key]
	local queue = queue_data.Queue

	-- Cleanup job:

	if queue_data.CleanupJob ~= nil then
		queue_data.CleanupJob:Disconnect()
		queue_data.CleanupJob = nil
	end

	-- Queue logic:

	if os.clock() - queue_data.LastWrite > SETTINGS.RobloxWriteCooldown and #queue == 0 then
		queue_data.LastWrite = os.clock()
		return callback()
	else
		table.insert(queue, callback)
		while true do
			if os.clock() - queue_data.LastWrite > SETTINGS.RobloxWriteCooldown and queue[1] == callback then
				table.remove(queue, 1)
				queue_data.LastWrite = os.clock()
				return callback()
			end
			task.wait()
		end
	end

end

local function IsCustomWriteQueueEmptyFor(store, key) --> is_empty [bool]
	local lookup = CustomWriteQueue[store]
	if lookup ~= nil then
		lookup = lookup[key]
		return lookup == nil or #lookup.Queue == 0
	end
	return true
end

local function WaitForLiveAccessCheck() -- This function was created to prevent the ProfileService module yielding execution when required
	while IsLiveCheckActive == true do
		task.wait()
	end
end

local function WaitForPendingProfileStore(profile_store)
	while profile_store._is_pending == true do
		task.wait()
	end
end

local function RegisterIssue(error_message, store_name, store_scope, profile_key) -- Called when a DataStore API call errors
	warn("[ProfileService]: DataStore API error " .. IdentifyProfile(store_name, store_scope, profile_key) .. " - \"" .. tostring(error_message) .. "\"")
	table.insert(IssueQueue, os.clock()) -- Adding issue time to queue
	ProfileService.IssueSignal:Fire(tostring(error_message), store_name, profile_key)
end

local function RegisterCorruption(store_name, store_scope, profile_key) -- Called when a corrupted profile is loaded
	warn("[ProfileService]: Resolved profile corruption " .. IdentifyProfile(store_name, store_scope, profile_key))
	ProfileService.CorruptionSignal:Fire(store_name, profile_key)
end

local function NewMockDataStoreKeyInfo(params)

	local version_id_string = tostring(params.VersionId or 0)
	local meta_data = params.MetaData or {}
	local user_ids = params.UserIds or {}

	return {
		CreatedTime = params.CreatedTime,
		UpdatedTime = params.UpdatedTime,
		Version = string.rep("0", 16) .. "."
			.. string.rep("0", 10 - string.len(version_id_string)) .. version_id_string
			.. "." .. string.rep("0", 16) .. "." .. "01",

		GetMetadata = function()
			return DeepCopyTable(meta_data)
		end,

		GetUserIds = function()
			return DeepCopyTable(user_ids)
		end,
	}

end

local function MockUpdateAsync(mock_data_store, profile_store_name, key, transform_function, is_get_call) --> loaded_data, key_info

	local profile_store = mock_data_store[profile_store_name]

	if profile_store == nil then
		profile_store = {}
		mock_data_store[profile_store_name] = profile_store
	end

	local epoch_time = math.floor(os.time() * 1000)
	local mock_entry = profile_store[key]
	local mock_entry_was_nil = false

	if mock_entry == nil then
		mock_entry_was_nil = true
		if is_get_call ~= true then
			mock_entry = {
				Data = nil,
				CreatedTime = epoch_time,
				UpdatedTime = epoch_time,
				VersionId = 0,
				UserIds = {},
				MetaData = {},
			}
			profile_store[key] = mock_entry
		end
	end

	local mock_key_info = mock_entry_was_nil == false and NewMockDataStoreKeyInfo(mock_entry) or nil

	local transform, user_ids, roblox_meta_data = transform_function(mock_entry and mock_entry.Data, mock_key_info)

	if transform == nil then
		return nil
	else
		if mock_entry ~= nil and is_get_call ~= true then
			mock_entry.Data = transform
			mock_entry.UserIds = DeepCopyTable(user_ids or {})
			mock_entry.MetaData = DeepCopyTable(roblox_meta_data or {})
			mock_entry.VersionId += 1
			mock_entry.UpdatedTime = epoch_time
		end

		return DeepCopyTable(transform), mock_entry ~= nil and NewMockDataStoreKeyInfo(mock_entry) or nil
	end

end

local function IsThisSession(session_tag)
	return session_tag[1] == PlaceId and session_tag[2] == JobId
end
