tArgs = {...}
face = 0
local up = 0
local fuel
local gx = tonumber(tArgs[1]) --target x pos
local gy = tonumber(tArgs[2]) --target y pos
local gz = tonumber(tArgs[3]) --target z pos
local x, y, z --defines the amount to move
function prepare() --setup
    rednet.open("right") --activate right modem
    cx,cy,cz = gps.locate(3) -- sets current x, y, z
    if #tArgs ~= 3 then -- if incorrect amount of args
        print("Please input x, y, z coordinates")
    end
    fuel = turtle.getFuelLevel() -- the fuel level of robot
    print("Fuel Level: "..fuel)
    if fuel < 1000 then -- random # choice should be enough for long distance
        print("Fuel Level might be too low")
        print("Would you like to refuel? yes/no")
        input = read() --looking at user input
        if  input == "yes" then
  turtle.select(1)
            print("Place fuel source in selected slot")
            turtle.refuel(20) --refuel with 20
            print("Refuelling")
            fuel = turtle.getFuelLevel() -- rechecking fuel level
            print("Fuel Level is now: ".. fuel)
        else
            print("Refueling Canceled") -- if person type no
        end
    else
        print("There should be enough fuel for the travel")
        print("No refuelling necessary")
    end
    print("Current position: "..cx..", "..cy..", "..cz) --print cur pos
    print("Going to: "..gx..", "..gy..", "..gz) --print target pos
end
function currentFace() --find what pos the turtle is facing
    while not turtle.forward() do -- try go forward
        if not turtle.up() then -- try to do up
            turtle.digUp() -- dig up
        end
    end
    local nx,ny,nz = gps.locate(3) --take new pos
    print("New position: "..nx..", "..ny..", "..nz)
    if cx < nx then -- this determines where the turtle is facing
            face = 3
    elseif cx > nx then
        face = 1
    elseif cz < nz then
        face = 0
    elseif cz > nz then
        face = 2
    end
    print("I am facing: "..face)
end
function turnToFace(f) --turn until facing desired direction
    if face ~= f then
        while face ~= f do
            turtle.turnRight()
    os.sleep(.1)
            face = face + 1
if face == 5 then
face = 0
end
        end
    else
    print("Facing the right way")
    end
end
function determineFaceX() -- determine the desired way to face on the x axis (1st step)
 nx,ny,nz = gps.locate(3)

    if gx < nx then
        turnToFace(1)
    elseif gx > nx then
        turnToFace(3)
    end
end
function determineFaceZ() -- determine the desired way to face on the z axis (2st step)
    if gz < nz then
        turnToFace(2)
    elseif gz > nz then
        turnToFace(4)
    end
end
function determineMoveX() -- determine how much to move on the x axis
    x = gx - nx
    if x < 0 then
        x = -x
    end
end
function determineMoveY() -- determine how much to move on the y axis
    y = gy - ny
end
function determineMoveZ() -- determine how much to move on the z axis
    z = gz - nz
    if z < 0 then
        z = -z
    end
end
function move (m) -- the actual movement on x and z axis
if x ==0 or z == 0 then
print("Don't need to move")
else
    for i=1, m do
        while not turtle.forward() do
            up = up + 1
            if not turtle.up() then
                turtle.digUp()
            end
        end
end
    end
end
function moveY (b) -- the actual movement on y axis
--print(y)
    if y > 0 then
        for i=1, y do
            turtle.up()
        end
    elseif y < 0 then
        for i = 1,-y do
            while not turtle.down() do
                turtle.digDown()
            end
        end
    end
    for p=1, up do
        turtle.down()
    end
end
-- calling all necessary function
prepare()
currentFace()
determineFaceX()
determineMoveX()
move(x)
determineFaceZ()
determineMoveZ()
move(z)
determineMoveY()
moveY(y)