-- secureBootCheck.lua

-- 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

-- Function to display the fullscreen error
local function showErrorScreen()
    term.clear()
    term.setCursorPos(1, 1)

    -- ASCII art with red dog and X eyes
    local asciiArt = [[
     |\_/|
     | X X   Doggy OS Security!
     |   <>              _
     |  _/\------____ ((| |))
     |               `--' |
 ____|_       ___|   |___.'
/_/_____/____/_______|
]]

    -- Error and instruction messages
    local errorMessage = "Script blocked due to security policy."
    local instructionMessage = "Press F1 to cancel."

    -- Calculate positions for centering the ASCII art
    local width, height = term.getSize()
    local artLines = {}
    for line in asciiArt:gmatch("[^\r\n]+") do
        table.insert(artLines, line)
    end

    local startY = math.floor((height - #artLines - 4) / 2)  -- Adjust for extra lines
    local startX = math.floor((width - #artLines[1]) / 2)

    -- Display ASCII art centered with red color
    term.setTextColor(colors.red)  -- Set text color to red
    for i, line in ipairs(artLines) do
        term.setCursorPos(startX, startY + i)
        term.write(line)
    end
    term.setTextColor(colors.white)  -- Reset text color to white

    -- Display the error message, slightly raised
    local messageX = math.floor((width - #errorMessage) / 2)
    term.setCursorPos(messageX, startY + #artLines + 2)  -- Adjusted position
    term.write(errorMessage)

    -- Display the instruction message at the bottom, centered
    local instructionX = math.floor((width - #instructionMessage) / 2)
    term.setCursorPos(instructionX, height - 1)  -- Position at the bottom
    term.write(instructionMessage)

    -- Prevent further execution until F1 is pressed
    while true do
        local event, key = os.pullEvent("key")
        if key == keys.f1 then
            term.setCursorPos(1, 1)  -- Set cursor position before exiting
            term.clear()  -- Clear the screen before exiting the loop
            break  -- Exit the loop when F1 is pressed
        end
    end
end

-- Run the secure boot check and show error if it fails
if not isSecureBootConfigured() then
    showErrorScreen()
end