secure lock with local users

local MAX_ATTEMPTS = 3   -- Maximum number of incorrect password attempts allowed
local LOCKOUT_TIME = 30  -- Lockout time in seconds after reaching maximum attempts

local USERS_FOLDER_DISK = "/disk/users/"
local USERS_FOLDER_LOCAL = "/local/users/"
local ERROR_FOLDER = "/disk/error/"
local BSOD_PROGRAM = "BSOD.lua"

local USERS_FOLDER -- To be determined dynamically

local function determineUsersFolder()
    if fs.exists(USERS_FOLDER_LOCAL) then
        USERS_FOLDER = USERS_FOLDER_LOCAL
    elseif fs.exists(USERS_FOLDER_DISK) then
        USERS_FOLDER = USERS_FOLDER_DISK
    else
        error("Users folder not found.")
    end
end

local function getUserCredentials(username)
    local passwordFile = fs.combine(USERS_FOLDER .. username, "password.txt")

    if fs.exists(passwordFile) then
        local file = fs.open(passwordFile, "r")
        local storedPassword = file.readLine()
        file.close()
        return storedPassword
    else
        return nil  -- User does not exist
    end
end

local function checkCredentials(username)
    local storedPassword = getUserCredentials(username)

    if not storedPassword then
        return false  -- User does not exist
    end

    local attempts = 0

    repeat
        term.clear()
        term.setCursorPos(1, 1)
        print("Enter password for " .. username .. ":")
        local enteredPassword = read("*")
        attempts = attempts + 1

        if enteredPassword == storedPassword then
            return true
        else
            print("Incorrect password. Attempts left: " .. tostring(MAX_ATTEMPTS - attempts))
        end
    until attempts >= MAX_ATTEMPTS

    print("Too many incorrect attempts. Locked out for " .. LOCKOUT_TIME .. " seconds.")
    os.sleep(LOCKOUT_TIME)

    return false
end

local function main()
    term.clear()
    term.setCursorPos(1, 1)

    determineUsersFolder() -- Determine the users' folder dynamically

    print("Enter username:")
    local enteredUsername = read()

    local users = fs.list(USERS_FOLDER)

    if not users or #users == 0 then
        -- No users detected, run the BSOD program
        shell.run(ERROR_FOLDER .. BSOD_PROGRAM)
    elseif checkCredentials(enteredUsername) then
        print("Access granted. Welcome, " .. enteredUsername .. "!")
        -- Your main OS code goes here
    else
        print("Access denied.")
    end
end

main()