timer

local xs = 7
local xm = 4
local xh = 1
local y = 1
local monitor = peripheral.wrap("left")
local m = 33
local h = 5
local c = 20
local logic = 1

if not fs.exists("status") then
    local file = io.open("status", "w")
    file:write()
    file:close()
end

function write(path, text)
    local file = assert(io.open(path, "w"))
    file:write(text)
    file:close()
end

function writeFromTable(path, t)
    local text = ""
    for  _, line in pairs(t) do
        text = text..line.."/n"
    end
    write(path, text)
end

function getTable(path)
    if fs.exists(path) then
        local file = io.open(path, "r")
        local lines = {}
        local u = 1
        local line = file:read("*1")
        while line ~= nil do
            lines[i] = line
            line = file:read("*1")
            u = u + 1
        end
        file:close()
        return lines
    end
    return {}
end

function w(path, n, text)
    local lines = getTable(path)
    lines[n] = text
    writeFromTable(path, lines)
end

local config = getTable("status")
h = tonumber(string.sub(config[1], 1))
m = tonumber(string.sub(config[2], 1))
c = tonumber(string.sub(config[3], 1))

while logic==1 do
    rs.setOutput("top",true)
    for i = 60,0,-1 do
        c = c-1
        monitor.clear()
        monitor.setCursorPos(3,1)
        monitor.write(":")
        monitor.setCursorPos(6,1)
        monitor.write(":")
        monitor.setCursorPos(xs,y)
        monitor.write(tostring(c))
        monitor.setCursorPos(xm,y)
        monitor.write(tostring(m))
        monitor.setCursorPos(xh,y)
        monitor.write(tostring(h))
        sleep(1)
        w("status", 1,h)
        w("status", 2,m)
        w("status", 3,c)
        if c == 0 then
           c = 60
           m = m-1
           monitor.clear()
           monitor.setCursorPos(3,1)
           monitor.write(":")
           monitor.setCursorPos(xs,y)
           monitor.write(tostring(0))
           monitor.setCursorPos(xm,y)
           monitor.write(tostring(m))
           monitor.setCursorPos(xh,y)
           monitor.write(tostring(h))
        end
        if m == 0 then
           m = 60
           h = h-1
           monitor.clear()
           monitor.setCursorPos(6,1)
           monitor.write(":")
           monitor.setCursorPos(xs,y)
           monitor.write(tostring(0))
           monitor.setCursorPos(xm,y)
           monitor.write(tostring(m))
           monitor.setCursorPos(xh,y)
           monitor.write(tostring(h))
        end
        if h ==0 then
            if m == 0 then
                if c == 0 then
                    logic = 0
                end
            end
        end
    end
end