prog

mon = peripheral.wrap("right")
mon.setBackgroundColor(colors.black)
mon.clear()
w,h = mon.getSize()
tw, th = term.getSize()

items = {}

print(tw)
changeCostButton = {id = "changeCost", color = colors.green, text1 = {text = "Change", ydiff = 1}, text2 = {text = "Cost", ydiff = 2}, x1 = (tw/2)-(8/2)+1, y1 = 5, x2 = (tw/2)-(8/2)+1+7, y2 = 8}
changeNameButton = {id = "changeName", color = colors.blue, text1 = {text = "Change", ydiff = 1}, text2 = {text = "Name", ydiff = 2}, x1 = (tw/2)-(8/2)+1, y1 = 11, x2 = (tw/2)-(8/2)+1+7, y2 = 14}

tempMoving = 0

function updateItems()
  items = {}
  file = io.open("items", "r")
  for line in file:lines() do
    if line ~= "" then
      itemN, priceN = line:match("([^:]+):([^:]+)")
      table.insert(items, {item = itemN, price = tonumber(priceN)})
    end
  end
  file:close()
end
function updateMonitor()
  mon.setBackgroundColor(colors.black)
  mon.clear()
  for i, v in pairs(items) do
    mon.setCursorPos(1,i)
    if i%2 == 0 then
      mon.setBackgroundColor(colors.gray)
      mon.clearLine()
    else
      mon.setBackgroundColor(colors.lightGray)
      mon.clearLine()
    end
    mon.write(string.sub(v["item"],1,(w-string.len(" - $"..v["price"]))).." - $"..v["price"])
  end
end
function showPassword()
  term.setBackgroundColor(colors.black)
  term.clear()
  term.setCursorPos(1,1)
  term.write("Password: ")
  pass = read("*")
  if pass == "temp" then
    print("Access Granted")
    sleep(0.5)
    return true
  elseif pass == "term" then
    error("Terminating")
  else
    print("Wrong Password!")
    sleep(3)
    return false
  end
end
function updateScreen()
  term.setBackgroundColor(colors.black)
  term.clear()
  last = 0
  for i, v in pairs(items) do
    term.setCursorPos(1,i)
    if i%2 == 0 then
      term.setBackgroundColor(colors.gray)
      term.clearLine()
    else
      term.setBackgroundColor(colors.lightGray)
      term.clearLine()
    end
    term.write(v["item"].." - $"..v["price"])
    last = i
  end
  if last < th then
    term.setCursorPos(1, last+1)
    term.setBackgroundColor(colors.green)
    term.clearLine()
    term.write("ADD ITEM")
  end
end
function showDetails(num)
  term.setBackgroundColor(colors.black)
  term.clear()
  item = items[num]
  term.setCursorPos((tw/2)-(string.len(item["item"])/2)+1, 2)
  term.write(item["item"])
  term.setCursorPos((tw/2)-(string.len("$"..item["price"])/2)+1, 3)
  term.write("$"..item["price"])
  for i, v in pairs({changeCostButton, changeNameButton}) do
    term.setBackgroundColor(v["color"])
    for x = v["x1"], v["x2"] do
      for y = v["y1"], v["y2"] do
        term.setCursorPos(x,y)
        term.write(" ")
      end
    end
    term.setCursorPos(v["x1"]+(v["x2"]-v["x1"])/2-string.len(v["text1"]["text"])/2,v["y1"]+v["text1"]["ydiff"])
    term.write(v["text1"]["text"])
    term.setCursorPos(v["x1"]+(v["x2"]-v["x1"])/2-string.len(v["text2"]["text"])/2,v["y1"]+v["text2"]["ydiff"])
    term.write(v["text2"]["text"])
  end
end
function changeDetail(det, num)
  if det == "changeName" then
    term.setBackgroundColor(colors.black)
    term.clear()
    term.setCursorPos(1,1)
    term.write("New Name: ")
    newName = read()
    items[num]["item"] = newName
  elseif det == "changeCost" then
    term.setBackgroundColor(colors.black)
    term.clear()
    term.setCursorPos(1,1)
    term.write("New Price: $")
    newPrice = read()
    if tonumber(newPrice) ~= nil then
      items[num]["price"] = tonumber(newPrice)
    end
  end
  saveItems()
end
function saveItems()
  file = io.open("items", "w")
  for i, v in pairs(items) do
    file:write(v["item"]..":"..v["price"].."\n")
  end

  file:close()

  updateItems()
  updateMonitor()
end
function addItem()
  term.setBackgroundColor(colors.black)
  term.clear()
  term.setCursorPos(1,1)
  term.write("Item Name: ")
  newName = read()
  term.write("Item Price: $")
  newPrice = read()
  if tonumber(newPrice) ~= nil then
    table.insert(items, {item = newName, price = tonumber(newPrice)})
  end

  saveItems()
end
updateItems()
updateMonitor()
--updateScreen()

while true do
  if showPassword() then
    ev = ""
    while ev ~= "key" do
      updateScreen()
      ev, d1, d2, d3 = os.pullEvent()
      if ev == "key" then
      elseif ev == "mouse_click" then
        if d1 == 1 then
          if d3 == #items+1 then
            addItem()
          elseif d3 <= #items then
            showDetails(d3)
            subev, subd1, subd2, subd3 = os.pullEvent()
            if subev == "key" then
            elseif subev == "mouse_click" then
              for i, v in pairs({changeCostButton, changeNameButton}) do
                if subd2 > v["x1"] and subd2 < v["x2"] then
                  if subd3 > v["y1"] and subd3 < v["y2"] then
                    changeDetail(v["id"], d3)
                    print("Changed")
                    sleep(1)
                  end
                end
              end
            end
          end
        elseif d1 == 2 then
          if d3 <= #items then
            table.remove(items, d3)
            saveItems()
          end
        elseif d1 == 3 then
          if d3 <= #items then
            tempMoving = d3
            subbd3 = 0
            while subbd3 == 0 or subbd3 > #items or subbd3 == tempMoving do
              subbev, subbd1, subbd2, subbd3 = os.pullEvent("mouse_click")
            end
            temp = items[tempMoving]
            items[tempMoving] = items[subbd3]
            items[subbd3] = temp
            saveItems()
          end
        end
      end
    end
  end
end