local monitorSide = "top"
local filePath = "/disk/items"
local refreshTime = 30

local monitor = peripheral.wrap(monitorSide)
if not monitor then
    print("Error: No monitor on side '" .. monitorSide .. "'")
    return
end

monitor.setTextScale(1)

local function readItems()
    if not fs.exists(filePath) then return {} end
    local file = fs.open(filePath, "r")
    local items = {}
    local line = file.readLine()
    while line do
        table.insert(items, line)
        line = file.readLine()
    end
    file.close()
    return items
end

local function writeItems(items)
    local file = fs.open(filePath, "w")
    for _, item in ipairs(items) do
        file.writeLine(item)
    end
    file.close()
end

local function displayItems(items)
    monitor.setBackgroundColor(colors.black)
    monitor.setTextColor(colors.white)
    monitor.clear()

    for i, item in ipairs(items) do
        monitor.setCursorPos(1, i)    -- item text
        monitor.write(i .. ". " .. item)

        monitor.setCursorPos(30, i)   -- 'button'
        monitor.setTextColor(colors.red)
        monitor.write("[X]")
        monitor.setTextColor(colors.white)
    end
end

local function detectClick(items, x, y)
    -- Assuming 'button' starts at x=30, ends at 32 or 33
    if y >=1 and y <= #items then
        if x >= 30 and x <= 32 then
            -- Remove the clicked item
            table.remove(items, y)
            writeItems(items)
            displayItems(items)
            print("Removed item at line " .. y)
        end
    end
end

-- Main Loop
while true do
    local items = readItems()
    displayItems(items)

    local timer = os.startTimer(refreshTime)
    while true do
        local event, p1, p2, p3 = os.pullEvent()

        if event == "monitor_touch" then
            local side, x, y = p1, p2, p3
            if side == monitorSide then
                detectClick(items, x, y)
            end

        elseif event == "timer" and p1 == timer then
            break  -- Time to refresh the list
        end
    end
end