-- Function to create a new profile (already exists)
local function createProfile()
    term.clear()
    term.setCursorPos(1, 1)
    term.setTextColor(colors.cyan)
    print("Enter a username for the new profile:")
    term.setTextColor(colors.white)
    local username = read()

    local profilePath = "./dogchat/profiles/" .. username
    if fileExists(profilePath) then
        term.setTextColor(colors.red)
        print("Profile already exists.")
        term.setTextColor(colors.white)
        return
    end

    term.setTextColor(colors.cyan)
    print("Enter a password for the profile:")
    term.setTextColor(colors.white)
    local password = read("*")

    local encryptionKey = downloadOrCreateKey()
    local hashedPassword = xorEncryptDecrypt(password, encryptionKey)

    fs.makeDir(profilePath)
    local passwordFile = fs.open(profilePath .. "/password.txt", "w")
    passwordFile.write(hashedPassword)
    passwordFile.close()

    term.setTextColor(colors.green)
    print("Profile created successfully.")
    term.setTextColor(colors.white)
end

-- Function to read inbox and decrypt messages
local function readInbox(username)
    local profilePath = "./dogchat/profiles/" .. username
    local inboxPath = profilePath .. "/inbox.txt"

    if not fileExists(inboxPath) then
        term.setTextColor(colors.red)
        print("No messages found.")
        term.setTextColor(colors.white)
        return
    end

    -- Ask for password to decrypt messages
    term.setTextColor(colors.cyan)
    print("Enter your password to access the inbox:")
    term.setTextColor(colors.white)
    local password = read("*")

    local encryptionKey = downloadOrCreateKey()
    local passwordFile = fs.open(profilePath .. "/password.txt", "r")
    local storedPassword = passwordFile.readAll()
    passwordFile.close()

    -- Validate password
    if xorEncryptDecrypt(password, encryptionKey) ~= storedPassword then
        term.setTextColor(colors.red)
        print("Incorrect password.")
        term.setTextColor(colors.white)
        return
    end

    -- Decrypt the inbox
    local inboxFile = fs.open(inboxPath, "r")
    local encryptedMessages = inboxFile.readAll()
    inboxFile.close()

    local decryptedMessages = xorEncryptDecrypt(encryptedMessages, encryptionKey)

    term.setTextColor(colors.cyan)
    print("Inbox Messages:")
    term.setTextColor(colors.white)
    print(decryptedMessages)
end

-- Function to send a message to a profile's inbox
local function sendMessageToInbox(receiverUsername, message)
    local profilePath = "./dogchat/profiles/" .. receiverUsername
    local inboxPath = profilePath .. "/inbox.txt"

    local encryptionKey = downloadOrCreateKey()

    -- Encrypt the message before sending
    local encryptedMessage = xorEncryptDecrypt(message, encryptionKey)

    -- Write the encrypted message to the inbox
    fs.makeDir(profilePath)  -- Ensure the inbox exists
    local inboxFile = fs.open(inboxPath, "a")  -- Open inbox in append mode
    inboxFile.write(encryptedMessage .. "\n")
    inboxFile.close()

    term.setTextColor(colors.green)
    print("Message sent successfully.")
    term.setTextColor(colors.white)
end

-- Function to delete a profile (already exists)
local function deleteProfile()
    -- Same code as you provided earlier
end

-- Function to show settings menu (already exists)
local function settingsMenu()
    term.clear()
    term.setCursorPos(1, 1)
    print("Settings Menu:")
    print("1. Create New Profile")
    print("2. Delete Profile")
    print("3. Exit Settings")
    print("4. Read Inbox")
    print("5. Send Message")

    local choice = read()

    if choice == "1" then
        createProfile()
    elseif choice == "2" then
        deleteProfile()
    elseif choice == "3" then
        return
    elseif choice == "4" then
        term.setTextColor(colors.cyan)
        print("Enter the username to read inbox:")
        term.setTextColor(colors.white)
        local username = read()
        readInbox(username)
    elseif choice == "5" then
        term.setTextColor(colors.cyan)
        print("Enter the username to send a message to:")
        term.setTextColor(colors.white)
        local username = read()
        term.setTextColor(colors.cyan)
        print("Enter the message to send:")
        term.setTextColor(colors.white)
        local message = read()
        sendMessageToInbox(username, message)
    else
        term.setTextColor(colors.red)
        print("Invalid choice.")
        term.setTextColor(colors.white)
    end
end