-- Function to draw a border
local function drawBorder()
    term.clear()
    local w, h = term.getSize()
    for y = 1, h do
        term.setCursorPos(1, y)
        term.write("|")
        term.setCursorPos(w, y)
        term.write("|")
    end
    for x = 1, w do
        term.setCursorPos(x, 1)
        term.write("-")
        term.setCursorPos(x, h)
        term.write("-")
    end
    term.setCursorPos(1, 1)
    term.write("+")
    term.setCursorPos(w, 1)
    term.write("+")
    term.setCursorPos(1, h)
    term.write("+")
    term.setCursorPos(w, h)
    term.write("+")
end

-- Function to center text on the screen
local function centerText(text, y)
    local w, _ = term.getSize()
    if #text > w then
        local firstLine = text:sub(1, w)
        local secondLine = text:sub(w + 1, #text)
        local x1 = math.floor((w - #firstLine) / 2) + 1
        local x2 = math.floor((w - #secondLine) / 2) + 1
        term.setCursorPos(x1, y)
        term.write(firstLine)
        term.setCursorPos(x2, y + 1)
        term.write(secondLine)
    else
        local x = math.floor((w - #text) / 2) + 1
        term.setCursorPos(x, y)
        term.write(text)
    end
end

-- Function to show an error message
local function showError(message, title)
    drawBorder()
    local _, h = term.getSize()
    centerText(title, math.floor(h / 2) - 3)
    centerText("Error:", math.floor(h / 2) - 1)
    centerText(message, math.floor(h / 2) + 1)
    while true do
        os.pullEvent("key")
    end
end

-- Function to show a non-malicious error message
local function showNonMaliciousError(message)
    showError(message, "Doggy OS Non-Malicious Error")
end

-- Check for boot.lock file
if fs.exists("/boot.lock") then
    showError("System Disabled", "Doggy OS Security Error")
end

-- Function to check if .settings file exists and contains shell.allow_disk_startup
local function isSecureBootConfigured()
    local settingsPath = "/.settings"
    if fs.exists(settingsPath) then
        local file = fs.open(settingsPath, "r")
        if file then
            local contents = file.readAll()
            file.close()
            -- Check if .settings contains shell.allow_disk_startup
            if not string.find(contents, '["%s-]shell%.allow_disk_startup["%s-]') then
                return false  -- shell.allow_disk_startup not found
            end
        end
    else
        -- .settings file doesn't exist
        return false  -- Secure boot configuration file is missing
    end
    return true  -- Secure boot is properly configured
end

if not isSecureBootConfigured() then
    showError("Secure boot config file corrupted", "Doggy OS Security Error")
end

-- Function to check for malicious paths in a file
local function containsMaliciousPaths(filePath)
    if not fs.exists(filePath) then
        return false
    end

    local file = fs.open(filePath, "r")
    if not file then
        return false
    end

    local contents = file.readAll()
    file.close()

    local maliciousPaths = {
        "/disk/os/", "/disk/boot/", "/disk/bootloader/", "/disk/security/", "/disk/users/", "/disk/",
        "disk/os", "disk/boot", "disk/bootloader", "disk/security", "disk/users", "disk"
    }

    for _, path in ipairs(maliciousPaths) do
        if string.find(contents, path, 1, true) then
            return true
        end
    end

    return false
end

-- Check if /disk2/startup or /disk2/startup.lua includes malicious paths
if containsMaliciousPaths("/disk2/startup") then
    showError("Malicious Boot Device: /disk2/startup", "Doggy OS Security Error")
elseif containsMaliciousPaths("/disk2/startup.lua") then
    showError("Malicious Boot Device: /disk2/startup.lua", "Doggy OS Security Error")
end

-- Check if /disk/users directory is empty
local function isDiskUsersEmpty()
    local usersDir = "/disk/users"
    if fs.exists(usersDir) and fs.isDir(usersDir) then
        local files = fs.list(usersDir)
        return #files == 0
    end
    return true
end

if isDiskUsersEmpty() then
    showNonMaliciousError("No user data found")
end

-- Continue with the normal boot process if no issues were found
print("No issues detected. Continuing boot process...")
-- Your normal boot code here