terminal

---------This Program is By EvasiveParacite and
---------is used to send commands to the main
---------computer

--------Configuration (you can change this)---------
local channel = 92 --must be the same as replyChannel on main computer
local modemSide = "bottom"
local promptTextColor = colors.orange
local userTextColor = colors.yellow
local confirmTextColor = colors.red --color of command when programs asks for confirmation
local helpTextColor = colors.green
local helpPageDelay = .8 --delay between writing each like in the help page in seconds

--------Initializaton (do NOT change this)---------
local modem = peripheral.wrap(modemSide)
local command = " "
local commandStart = " " --first word of command
local parameters = "" --all but first word of command
local commands = {"help","/ "}
local commandDescriptions = {"displays a list of commands, no parameters","runs the parameters as command block text"}
local answer = " "
local answered = false
local isValid = false

local event = "modem_message"
local side = modemSide
local senderChannel = channel
local replyChannel = channel
local message = ""
local distance = 0

------------------Functions------------------------
local function readCommand(string)
  local count = 0
  for i in string.gmatch(string,"%S+") do
    count = count + 1
    if count == 1 then
      commandStart = i
    elseif count == 2 then
      parameters = i
    else
      parameters = parameters.." "..i
    end
  end
end

local function moveCursorDown()
  local x = 0
  local y = 0
  x, y = term.getCursorPos()
  term.setCursorPos(1,y+1)
end

local function isCommandValid(startString) --string must be commandStart
  local tempBool = false
  for i=1, #commands do
    if startString == commands[i] then
      tempBool = true
    end
  end
  return tempBool
end

local function confirm()
  term.setTextColor(promptTextColor)
  term.write("[y/n]: ")
  term.setTextColor(userTextColor)
  answer = io.read()
  term.setTextColor(promptTextColor)
  if answer == "y" or answer == "n" then
    answered = true
  else
    answered = false
    while not answered do
      print("you must enter 'y' or 'n'...")
      term.write("[y/n]: ")
      term.setTextColor(userTextColor)
      answer = io.read()
      if answer == "y" or answer == "n" then
        answered = true
      end
      term.setTextColor(promptTextColor)
    end
  end
end

local function prompt()
  term.setTextColor(promptTextColor)
  term.write("Please enter your command or 'help' for more")
  moveCursorDown()
  term.write("info: ")
  term.setTextColor(userTextColor)

  command = io.read()
  print("")
  readCommand(command)
  isValid = isCommandValid(commandStart)

  term.setTextColor(colors.red)
  if commandStart == "help" then
    term.clear()
    term.setCursorPos(1,1)
    answer = "y"
  elseif parameters == nil or parameters == "" then
     print("you have not entered any parameters, your command must be at least 2 words unless it is 'help'")
  elseif isValid == false then
     print("'"..commandStart.."'".." is not a valid command. Would you like to go to the help page?")
     confirm()
     if answer == "y" then
       commandStart = "help"
       commandEnd = ""
     end
  else
    term.setTextColor(confirmTextColor)
    print("'"..commandStart.."' + '"..parameters.."'")
    term.setTextColor(promptTextColor)
    print("Is this the command you would like to use?")

    confirm()

  end
  term.setTextColor(promptTextColor)
end

local function displayHelp()
  term.setTextColor(helpTextColor)
  print("Welcome to the help page!")
  print(" ")
  print(" ")
  sleep(helpPageDelay/3)
  print("Command Formatting: command + ' ' + parameters")
  sleep(helpPageDelay/3)
  print(" ")
  print("Commands: ")
  sleep(helpPageDelay)
  print(" ")
  for i=1, #commands do
    term.write("'"..commands[i].."' : ")
    print(commandDescriptions[i])
    sleep(helpPageDelay)
  end
  term.setTextColor(promptTextColor)
  sleep(helpPageDelay)
  print(" ")
  print(" ")

end

local function transmit()

end

local function waitForReply()
  local count = 0
  local correctReply = false
  local correctEvent = false

  while count < 5 and (not correctReply or not correctEvent) do
    print("listening for a confirmation of command execution...  if a valid reply is not found within aproximatly "..60-i*20.." seconds the attemp will be abandoned")
    count = count + 1
    os.startTimer(20)
    event, side, senderChannel, replyChannel, message, distance = os.pullEvent("modem_message")
    if event == "modem_message" then
      correctEvent = true
    end
    if message == distance then
      correctReply == true
    end
  end
  print("")
  if not correctReply and not correctEvent then
    term.setTextColor(colors.red)
    print("Command Execution Failed")
  else
    term.setTextColor(colors.green)
    print("Success! Command Executed")
  end
  term.setTextColor(promptTextColor)
end

------------------Main Program---------------------
modem.open(channel)

while true do
  prompt()
  if answer == "y" and isValid == true then
    if commandStart == "help" then
      displayHelp()
    else
      transmit()
      waitForReply()
    end
  end
end