Monitor1

os.pullEvent = os.pullEventRaw
local monitor = nil
-- Determine where monitor is.
monitorSide = nil
if peripheral.isPresent("left") and peripheral.getType("left")=="monitor" then
  monitorSide = "left"
elseif peripheral.isPresent("right") and peripheral.getType("right")=="monitor" then
  monitorSide = "right"
elseif peripheral.isPresent("top") and peripheral.getType("top")=="monitor" then
  monitorSide = "top"
elseif peripheral.isPresent("back") and peripheral.getType("back")=="monitor" then
  monitorSide = "back"
elseif peripheral.isPresent("bottom") and peripheral.getType("bottom")=="monitor" then
  monitorSide = "bottom"
end
if monitorSide ~= nil then
  monitor = peripheral.wrap(monitorSide)
  print("Monitor found on "..monitorSide)
  monitor.setTextScale(.7)
else
  monitor = nil
end
local players = {}
local stayInLoop = true
local delay = 0
local adminLogin = 0

function fileSave()
  file = fs.open("players","w")
  file.writeLine(textutils.serialize(players))
  file.close()
end

function player_new(name,job)
  table.insert(players,{name,job})
  fileSave()
  return true
end

function player_job(name,newJob)
  for i=1,#players do
    if players[i][1] == name then
    players[i][2] = newJob
    fileSave()
    return true
  end
 end
 return false
end

function player_remove(name)
  for i=1,#players do
    if players[i][1] == name then
      table.remove(players,i)
      fileSave()
      return true
    end
  end
  return false
end

function commands_help()
  print("Available options are: ")
  print("'new' - Adds a new player to the console.")
  print("'job' - Changes the job for an existing player.")
  print("'rename' - Renames an existing player")
  print("'delete' - Deletes and existing players from the console.")
  print("'list' - Shows a list of players in the system.")
  print("'logout' - Logs out of this system.")
  print("NOTE: Please logout after every command to prevent any unwanted changes!")
end

function after_command()
  print("")
  print("press 'Enter' to continue...")
  read()
  term.clear()
  term.setCursorPos(1,1)
end

print("Monitor Activated!")
if (fs.exists("players") == true) then
  print("Reading data...")
  file = fs.open("players","r")
  data = file.readLine()
  file.close()
  players = textutils.unserialize(data)
end

while stayInLoop do
    local cmdIssued = 0
    sleep(0.1)
    delay = delay + 0.1
    --Auto reboot to prevent computer shutdown.
    if (delay > 600) then
        os.reboot()
    end

    --Reset monitor.
    monitor.clear()

    --Header.
    monitor.setCursorPos(9,1)
    monitor.write("Current Duties:")
    monitor.setCursorPos(9,2)
    monitor.write("===============")

    --Loop through all players.
    local line = 3
    for i=1,#players do
        monitor.setCursorPos(1,line)
        monitor.write(">>"..players[i][1]..":")
        line = line + 1
        monitor.setCursorPos(1,line)
        monitor.write("Job:> "..players[i][2])
        line = line + 2
    end

    if adminLogin == 0 then
        write("Enter admin password for commands: ")
        local pass = read("0")
        if pass == "master" then
          adminLogin = 1
        end
    end

    if adminLogin == 1 then
      --Wait for commands and execute them.
      commands_help()
      write("Command: ")
      local cmd = read()

      if cmd == "new" then
        print("New player adding. Write 'q' to quit.")
        write("Name: ")
        local name = read()
        if not (name=="q") then
          print("New Job: ")
          local job= read()
          if (player_new(name,job)==true) then
            print("Player "..name.." added successfully")
          end
          after_command()
        end
      end

      if cmd == "job" then
        print("Change job for player. Write 'q' to quit.")
        write("Name: ")
        local name = read()
        if not (name=="q") then
          print ("New Job: ")
          local job = read()
          if (player_job(name,job)==true) then
            print("Player "..name.." edited successfully")
          else
            print("Player "..name.." not found!")
          end
          after_command()
        end
      end

      if cmd == "rename" then
        print("Change name for and existing player. Write 'q' to quit")
        write("Name: ")
        local name = read()
        if not (name=="q") then
          write("New name: ")
          local new = read()
          if (player_rename(name,new)==true) then
            print("Player "..name.." renamed to "..new)
          else
            print("Player "..name.." not found!")
          end
        end
      end

      if cmd == "delete" then
          print(" Delete a player by name. Write 'q' to quit")
          write("Name: ")
          local name = read()
          if not (name=="q") then
            if (player_remove(name)==true) then
              print("Player "..name.." removed!")
            else
              print("Player "..name.." not found!")
            end
            after_command()
          end
       end

      if cmd == "list" then
        for i=1,#players do
            print(players[i][1])
        end
        after_command()
      end

      if cmd == "admin" then
        stayInLoop = false
        term.clear()
        term.setCursorPos(1,1)
        write("Maintenance Mode!")
      end

      if cmd == "logout" then
        os.reboot()
      end
    end
  end