-- Clear the screen and set up colors
term.clear()
term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)
term.clear()

-- Define the width and height of the screen
local width, height = term.getSize()

-- Function to center text on the screen
local function centerText(y, text, textColor)
    local x = math.floor((width - #text) / 2)
    term.setCursorPos(x, y)
    term.setTextColor(textColor)
    term.write(text)
end

-- Display the initial message "Doggy OS Security Error!" at the top in white
centerText(3, "Doggy OS Security Error!", colors.white)

-- Function to show an error message with ASCII art
local function showError(message)
    term.clear()

    -- ASCII art with yellow dog and ? eyes
    local dogArt = {
        "     |\\_/|                  ",
        "     | ? ?                   ",
        "     |   <>              _   ",
        "     |  _/\\------____ ((| |))",
        "     |               `--' |  ",
        " _____|_       ___|   |___.  ",
        "/_/_____/____/_______|       "
    }

    local startLine = math.floor((height - #dogArt) / 2) - 2

    -- Display the dog ASCII art with yellow color and ? eyes
    term.setTextColor(colors.yellow)
    for i, line in ipairs(dogArt) do
        centerText(startLine + i, line, colors.yellow)
    end

    -- Display error message below the dog ASCII art in white
    term.setTextColor(colors.white)
    centerText(startLine + #dogArt + 2, "Error:", colors.white)
    centerText(startLine + #dogArt + 3, message, colors.white)

    -- Move "Please contact support." to the bottom in white
    centerText(height - 2, "Please contact support.", colors.white)
end

-- Function to request admin credentials
local function requestAdminUnlock()
    term.clear()
    centerText(3, "System Locked!", colors.red)
    centerText(5, "Enter Admin Credentials to Unlock", colors.white)

    -- Get username and password
    term.setCursorPos(math.floor(width / 2) - 6, height // 2)
    term.write("Username: ")
    local username = read()

    term.setCursorPos(math.floor(width / 2) - 6, height // 2 + 1)
    term.write("Password: ")
    local password = read("*")

    -- Check if user has both password.txt and admin.txt
    local userDir = "/disk/users/" .. username
    local adminPath = fs.combine(userDir, "admin.txt")
    local passwordPath = fs.combine(userDir, "password.txt")

    if fs.exists(adminPath) and fs.exists(passwordPath) then
        local file = fs.open(passwordPath, "r")
        if file.readAll() == password then
            fs.delete("/boot.lock")
            term.clear()
            centerText(3, "System Unlocked", colors.green)
            sleep(1)
            return true
        end
        file.close()
    end

    centerText(height - 1, "Invalid Credentials or No Admin Privileges.", colors.red)
    sleep(2)
    return false
end

-- Function to check for boot.lock file
local function checkBootLock()
    if fs.exists("/boot.lock") then
        while not requestAdminUnlock() do end
    end
end

-- Main function to initiate checks and continue boot process
local function main()
    checkBootLock()
    -- Additional security checks...
    shell.run("/disk/boot/BIOS")  -- Continue to boot
end

-- Start the main function
main()