farmbot

event = require("event")
robot = require("robot")
term = require("term")
component = require("component")

local farmSize = "exit"
local X = 1

local function display(t)
  io.write(t)
  os.sleep(1)
end

local function askSize()
  term.clear()
  term.setCursor(1,1)
  io.write("How large does the farm need to be?\nType 'exit' if you want to exit the program.\n")
  farmSize = io.read()
  if farmSize == "exit" then
    os.exit()
  elseif type(tonumber(farmSize)) == "number" then
    if farmSize % 2 == 0 then
      display("Working on it!")
      term.clear()
    else
      display("Please enter an even number!")
      askSize()
    end
  else
    display("Please enter a number.")
    askSize()
  end
  term.clear()
end

local function getSeeds()
  repeat local y = robot.suckDown()
  until y == false
end

local function check()
  robot.useDown()
  getSeeds()
  robot.forward()
end

local function checkX(n)
  for i=1, n do
  check()
  end
end

local function turnRight()
  robot.turnRight()
  robot.forward()
  robot.turnRight()
  robot.forward()
  X = 1
end

local function turnLeft()
  robot.turnLeft()
  robot.forward()
  robot.turnLeft()
  robot.forward()
  X = 0
end

local function turn()
  if X==0 then
    turnRight()
  else
    turnLeft()
  end
end

local function size(n)
  for i=1, n do
  checkX(n)
  turn()
  end
end

local function dropOff()
  for i=1, 16 do
    robot.select(i)
    robot.dropDown()
  end
end

local function exitFarm()
  local c = 0
  term.clear()
  term.setCursor(1,1)
  io.write("Press 'e' to exit during the cool down period!")
  local a, b, c, d = event.pull(60, "key_down")
  if c ~= nil then
    if string.char(c) == "e" then
      term.clear()
      term.setCursor(1,1)
      display("Exitting!\n")
      os.exit()
    else
      os.sleep(60)
    end
  end
  term.clear()
end

term.clear()
term.setCursor(1,1)
display("Farming robot v.2\n")
askSize()
io.write("Farming...")
local S = tonumber(farmSize)

while true do
  robot.forward()
  size(S)
  robot.turnRight()
  checkX(S)
  robot.turnLeft()
  robot.back()
  dropOff()
  exitFarm()
end