MemoryStoreHashMapPages

local MemoryStoreService = game:GetService("MemoryStoreService")

local testHashMap = MemoryStoreService:GetHashMap("HashMap1")

local EXPIRATION = 600
local NUM_TEST_ITEMS = 32

local function populateHashMap(hashMap: MemoryStoreHashMap, numItems: number): { [string]: any }
	print("Setting HashMap data...")
	local createdItems = {}

	for index = 1, numItems do
		local key = tostring(index) -- HashMap keys must be strings
		local value = `{key}_test_value`
		local success, result = pcall(hashMap.SetAsync, hashMap, key, value, EXPIRATION)
		
		if success then
			createdItems[key] = value
		else
			warn(`Error setting key {key}: {result}`)
		end
	end

	print("Done setting HashMap data.")
	return createdItems
end

local function getItemsFromAllPages(pages: MemoryStoreHashMapPages): { [string]: any }
	-- Purely for logging purposes, we track what page number we're on
	local currentPageNumber = 1
	local retrievedItems = {}

	while not pages.IsFinished do
		print(`Getting items on page {currentPageNumber}...`)
		local items = pages:GetCurrentPage()

		for _, entry in pairs(items) do
			print(`\t{entry.key}: {entry.value}`)
			retrievedItems[entry.key] = entry.value
		end

		-- Advance pages if there are more pages to read
		if not pages.IsFinished then
			pages:AdvanceToNextPageAsync()
			currentPageNumber += 1
		end
	end
	
	print("Finished reading all pages")
	return retrievedItems
end

local function compareAllItems(retrievedItems: { [string]: any }, expectedItems: { [string]: any }): number
	print("Comparing retrieved items to expected items...")
	local numMatchingItems = 0

	for key, expectedValue in pairs(expectedItems) do
		if retrievedItems[key] == expectedValue then
			numMatchingItems += 1
		else
			warn(`Mismatched retrieved value for key {key}: expected {expectedValue}, retrieved {retrievedItems[key]}`)
		end
	end
	
	print("Comparison complete!")
	return numMatchingItems
end

-- Keys added to the hashmap are also added to this expectedItems table.
-- Later, the retrieved hashmap items will be compared against this table of expected items.
local expectedItems = populateHashMap(testHashMap, NUM_TEST_ITEMS)

-- Getting pages can error. In this case, we will let it error and stop program execution,
-- but you may want to pcall it and handle it differently.
print(`Getting HashMap pages with ListItemsAsync...`)
local pages = testHashMap:ListItemsAsync(NUM_TEST_ITEMS)

local retrievedItems = getItemsFromAllPages(pages)
local numMatchingItems = compareAllItems(retrievedItems, expectedItems)

-- If there were no errors setting or getting items, all items should match.
print(`Program complete. {numMatchingItems}/{NUM_TEST_ITEMS} retrieved items matched the expected values.`)