Cookie Clicker NOT MINE!!

backcolor = 1
textcolor = 188
a = 1
add = 1
cost = 100
fs.makeDir("cookies")

if not fs.exists("cookies/cookiea") then
    mc = fs.open("cookies/cookiea", "w")
    mc.write("0")
    mc.close()
end
cc = fs.open("cookies/cookiea", "r")
a = cc.readLine()
cc.close()

if not fs.exists("cookies/background") then
    shell.run("pastebin", "get", "1LaRjsPG", "cookies/background")
end

function clear()
    term.clear()
    term.setCursorPos(1,1)
end

function cookie()
    term.setBackgroundColor(backcolor)
    term.clear()
    bground = paintutils.loadImage("cookies/background")
    paintutils.drawImage(bground,1,1)
    term.setCursorPos(1,1)
    term.setBackgroundColor(backcolor)
    term.setTextColor(textcolor)
    print("Cookie clicker V0.1")
    term.setCursorPos(25,1)
    print("Reset cookie clicker")
    term.setCursorPos(25,4)
    print("Double click(100 cookies)")
    term.setCursorPos(25,3)
    print("Upgrades:")
    term.setCursorPos(1,18)
    print("Exit")
    term.setCursorPos(4,16)
    print(a)
end
cookie()

while true do
    local event, button, X, Y = os.pullEventRaw()
    if event == "mouse_click" then
        if X >=25 and X <=45 and button == 1 and Y== 1 then
            fs.delete("cookies/cookiea")
            fs.delete("cookies/upgrade")
            mc = fs.open("cookies/cookiea", "w")
            mc.write("0")
            mc.close()
            a = 0
            add = 1
            cookie()
        elseif X >=25 and X <=50 and button == 1 and Y== 4 then
            clear()
            if not fs.exists("cookies/upgrade") then
                if upg == true then
                    clear()
                    up = fs.open("cookies/upgrade", "w")
                    up.write("true")
                    up.close()
                    upcc = a - cost
                    fs.delete("cookies/cookiea")
                    upc = fs.open("cookies/cookiea", "w")
                    upc.write(upcc)
                    upc.close()
                end
            end
            cookie()
        elseif X>=1 and X<=4 and Y== 18 and button ==1 then
            os.reboot()
        elseif X >=4 and X <=16 and button == 1 and Y >=6 and Y <=13 then
            clear()
            if a == "100.0" then
                upg = true
            end
            if fs.exists("cookies/upgrade") then
                add = 2
            end
            a = a + add
            fs.delete("cookies/cookiea")
            ca = fs.open("cookies/cookiea", "w")
            ca.write(a)
            ca.close()
            cc = fs.open("cookies/cookiea", "r")
            a = cc.readLine()
            cc.close()
            cookie()
            if a == "1.0" then
                term.setCursorPos(1,3)
                print("Wake and bake")
            end
            if a == "100.0" then
                term.setCursorPos(1,3)
                print("100 COOKIES")
            end
        end
    end
end