local tArgs = {...}

if #tArgs ~= 7 then
    print("Not enough Arguments")
    error()
end

if tArgs[4] ~= "north" or tArgs[4] ~= "east" or tArgs[4] ~= "south" or tArgs[4] ~= "west" then
    print("Argument 4 must be = north, east, south or west.")
    error()
end

local cDir = tArgs[4]
local cX = tonumber(tArgs[1])
local cY = tonumber(tArgs[2])
local cZ = tonumber(tArgs[3])

function turnRight()
  if cDir == "north" then
    cDir = "east"
  elseif cDir == "east" then
    cDir = "south"
  elseif cDir == "south" then
    cDir = "west"
  elseif cDir == "west" then
    cDir = "north"
  else
    print("Error!!")
    error()
  end
  turtle.turnRight()
end

function turnLeft()
    if cDir == "north" then
        cDir = "west"
    elseif cDir == "east" then
        cDir = "north"
    elseif cDir == "south" then
        cDir = "east"
    elseif cDir == "west" then
        cDir = "south"
    else
        print("Error!!")
        error()
    end
    turtle.turnLeft()
end

function turnTo(dir)
  if cDir ~= dir then
    repeat
     turnRight()
    until cDir == dir
  end
end

function moveForward()
  if cDir == "north" then
    cZ = cZ-1
  elseif cDir == "east" then
    cX = cX+1
  elseif cDir == "south" then
    cZ = cZ+1
  elseif cDir == "west" then
    cX = cX-1
  else
    print("Error!!")
    error()
  end
  while not turtle.forward() do
    turtle.dig()
  end
end

function moveUp()
  cY = cY+1
  while not turtle.up() do
    turtle.digUp()
  end
end

function moveDown()
  cY = cY-1
  while not turtle.down() do
    turtle.digDown()
  end
end

function moveToX(x)
  if cX < x then
    turnTo("east")
    repeat
      moveForward()
    until cX == x
  elseif cX > x then
    turnTo("west")
    repeat
      moveForward()
    until cX == x
  else
    --print("already there")
  end
end

function moveToZ(z)
  if cZ < z then
    turnTo("south")
    repeat
      moveForward()
    until cZ == z
  elseif cZ > z then
    turnTo("north")
    repeat
      moveForward()
    until cZ == z
  else
   --print("already there")
  end
end

function moveToY(y)
  if cY < y then
    repeat
      moveUp()
    until cY == y
  elseif cY > y then
    repeat
      moveDown()
    until cY == y
  else
   --print("already there")
  end
end

function goTo(x, y, z)
  moveToX(x)
  moveToY(y)
  moveToZ(z)
  turnTo("north")
end

goTo(tonumber(tArgs[5]), tonumber(tArgs[6]), tonumber(tArgs[7]))