PIN lock for Doggy OS pocket

-- File path for storing the PIN
local pinFilePath = "/disk/security/PIN.config"

-- Function to read the PIN from file or use default if not available
local function readPINFromFile()
    local file = fs.open(pinFilePath, "r")
    local pin = file and file.readLine() or "1234"
    if file then
        file.close()
    end
    return pin
end

-- Define your PIN
local correctPIN = readPINFromFile()

-- GUI Functions
local function drawScreen()
    term.clear()
    term.setCursorPos(1, 1)
    print("+-----+-----+-----+")
    print("|     |     |     |")
    print("|  1  |  2  |  3  |")
    print("|     |     |     |")
    print("+-----+-----+-----+")
    print("|     |     |     |")
    print("|  4  |  5  |  6  |")
    print("|     |     |     |")
    print("+-----+-----+-----+")
    print("|     |     |     |")
    print("|  7  |  8  |  9  |")
    print("|     |     |     |")
    print("+-----+-----+-----+")
    print("|     |     |     |")
    print("|  C  |  0  |  E  |")
    print("|     |     |     |")
    print("+-----+-----+-----+")
    term.setCursorPos(1, 18)
    write("Enter PIN:")
end

local function handleMouseClick(x, y)
    if x >= 2 and x <= 5 and y >= 2 and y <= 4 then
        return 1
    elseif x >= 8 and x <= 11 and y >= 2 and y <= 4 then
        return 2
    elseif x >= 14 and x <= 17 and y >= 2 and y <= 4 then
        return 3
    elseif x >= 2 and x <= 5 and y >= 6 and y <= 8 then
        return 4
    elseif x >= 8 and x <= 11 and y >= 6 and y <= 8 then
        return 5
    elseif x >= 14 and x <= 17 and y >= 6 and y <= 8 then
        return 6
    elseif x >= 2 and x <= 5 and y >= 10 and y <= 12 then
        return 7
    elseif x >= 8 and x <= 11 and y >= 10 and y <= 12 then
        return 8
    elseif x >= 14 and x <= 17 and y >= 10 and y <= 12 then
        return 9
    elseif x >= 2 and x <= 5 and y >= 14 and y <= 16 then
        return "C" -- Clear
    elseif x >= 8 and x <= 11 and y >= 14 and y <= 16 then
        return 0
    elseif x >= 14 and x <= 17 and y >= 14 and y <= 16 then
        return "E" -- Enter
    else
        return nil
    end
end

-- Main PIN Entry Function
local function enterPIN()
    local enteredPIN = ""
    local attempts = 3

    while attempts > 0 do
        drawScreen()
        term.setCursorBlink(false)
        term.setCursorPos(12, 18)
        write(string.rep("*", #enteredPIN))
        local event, _, x, y = os.pullEvent("mouse_click")

        if event == "mouse_click" then
            local button = handleMouseClick(x, y)
            if button then
                if button == "C" then
                    -- Clear button
                    enteredPIN = ""
                elseif button == "E" then
                    -- Enter button
                    if enteredPIN == correctPIN then
                        term.clear()
                        term.setCursorPos(1, 1)
                        print("Access Granted!")
                        -- Perform actions upon successful entry
                        break
                    else
                        term.clear()
                        term.setCursorPos(1, 1)
                        print("Incorrect PIN. Try again.")
                        attempts = attempts - 1
                        if attempts == 0 then
                            print("Access Denied!")
                        else
                            print("Attempts remaining: " .. attempts)
                        end
                        sleep(2)
                        enteredPIN = ""
                    end
                else
                    enteredPIN = enteredPIN .. tostring(button)
                end
            end
        end
    end
end

-- Start PIN Entry
enterPIN()