-- Configuration
local PAGINATION_SIZE = 10
local VALID_DIRECTIONS = { "left", "right", "top", "bottom", "front", "back" }

-- Input validation
local function isValidDirection(direction)
	if not direction then return false end

	local lowerDirection = string.lower(direction)
	for _, validDir in ipairs(VALID_DIRECTIONS) do
		if lowerDirection == validDir then
			return true
		end
	end
	return false
end

local function isExitCommand(input)
	return input == "quit" or input == "exit"
end

-- User interaction
local function promptForDirection()
	print("Enter the direction of the peripheral (left, right, top, bottom, front, back):")
	print("Type 'quit' or 'exit' to cancel.")
	return io.read()
end

local function waitForKeyPress()
	print("Press any key to continue...")
	os.pullEvent("key")
	term.clear()
end

-- Peripheral operations
local function getPeripheralMethods(direction)
	return peripheral.getMethods(direction)
end

-- Display functions
local function displayMethodPage(methods, startIndex, endIndex)
	for i = startIndex, endIndex do
		local methodName = methods[i]
		print(string.format("%d. %s", i, methodName))
	end
end

local function displayMethodsWithPagination(methods)
	if not methods or #methods == 0 then
		print("No methods found for this peripheral.")
		return
	end

	print(string.format("Found %d methods:", #methods))
	print(string.rep("-", 30))

	for i = 1, #methods, PAGINATION_SIZE do
		local endIndex = math.min(i + PAGINATION_SIZE - 1, #methods)
		displayMethodPage(methods, i, endIndex)

		if endIndex < #methods then
			waitForKeyPress()
		end
	end
end

-- Main program logic
local function getUserDirection()
	local direction = promptForDirection()

	if not direction or isExitCommand(direction) then
		print("Operation cancelled.")
		return nil
	end

	if not isValidDirection(direction) then
		print("Error: Invalid direction. Please use: " .. table.concat(VALID_DIRECTIONS, ", "))
		return nil
	end

	return direction
end

local function main()
	local direction = getUserDirection()
	if not direction then
		return
	end

	local methods = getPeripheralMethods(direction)
	if not methods then
		print("Error: No peripheral found in direction '" .. direction .. "'")
		return
	end

	displayMethodsWithPagination(methods)
end

-- Program entry point
main()