rednet.open("right")
connected = 0
oid = 0
x = 0
y = 0
z = 0
rotation = 0

function Forward()
  while turtle.detect() do
    turtle.dig()
  end
  turtle.forward()
  while turtle.detectUp() do
    turtle.digUp()
  end
  while turtle.detectDown() do
    turtle.digDown()
  end
  if rotation == 0 then
    z = z - 1
  elseif rotation == 1 then
    x = x - 1
  elseif rotation == 2 then
    z = z + 1
  elseif rotation == 3 then
    x = x + 1
  end
end

function Left()
  turtle.turnLeft()
  if rotation < 3 then
     rotati + 1
  else
     rotati
  end
end

function Right()
  turtle.turnRight()
  if rotation > 0 then
    rotation = rotation - 1
  else
    rotation = 3
  end
end

function Backwards()
  turtle.back()
  if rotation == 0 then
    z = z + 1
  elseif rotation == 1 then
    x = x + 1
  elseif rotation == 2 then
    z = z - 1
  elseif rotation == 3 then
    x = x - 1
  end
end

function Up()
end

function Down()
end

function StartMine()
  distance = 0
  while true do
    distance = distance + 1
    if distance < 25 then
      Forward()
     elseif rotati 0 then
      Left()
      Forward()
      Left()
      distance = 0
     elseif rotati 2 then
      Right()
      Forward()
      Right()
      distance = 0
    end
    id, msg = rednet.receive(1)
    if id == oid and msg == "StopMine" then
      break
    end
  end
end

function Return()
  while true do
    if rotation > 0 then
      Right()
    else
      if z > 0 then
        Forward()
      elseif z < 0 then
        Left()
        Left()
        while z < 0 do
          Forward()
        end
      elseif x > 0 then
        while rotation ~= 1 do
          Left()
        end
        Forward()
      elseif x < 0 then
        while rotation ~= 3 do
          Left()
        end
        Forward()
        break
      end
    end
  end
end

while true do
   if c 0 then
    id, msg = rednet.receive()
    print("got msg: " .. msg)
    if msg == "Connect" then
      rednet.send(id, "kt")
      print("sent msg: kt")
      oid = id
      id, msg = rednet.receive()
      print("got msg: " .. msg)
      if id == oid then
         c
      end
    end
   elseif c 1 then
    id, msg = rednet.receive()
    print("got msg: " .. msg)
    if msg == "Mine" and id == oid then
      StartMine()
    elseif msg == "Return" and id == oid then 
      Return()
    end
  end
end