MoveTo

local tArgs = {...}

local targetX = tonumber(tArgs[1])
local targetZ = tonumber(tArgs[2])

if not targetX and not targetZ then
    term.write("No X and Z given.")
    return
end

function moveForward(times)
    for i = 1,times do
        while turtle.forward() == false do
            turtle.dig()
        end
    end
end

function moveUp(times)
    for i = 1,times do
        while turtle.up() == false do
            turtle.digUp()
        end
    end
end

function moveDown(times)
    for i = 1,times do
        while turtle.down() == false do
            turtle.digDown()
        end
    end
end

function CheckRail(location,startingPosition)
    local requiredRails = (math.abs(location.x - startingPosition.x) + math.abs(location.z-startingPosition.z))
    return requiredRails
end

function FindRails()
    for i = 1,16 do
        local a = turtle.getItemDetail(i)
        if a then
            if a.name == "minecraft:rail" or a.name == "minecraft:powered_rail" then
                return i
            end
        end
    end

    return false
end

function neededFuel(location,startingPosition)
    local currentFuel = turtle.getFuelLevel()
    local requiredFuel = (math.abs(location.x - startingPosition.x) + math.abs(location.z-startingPosition.z))* 2
    return requiredFuel
end

function MoveToLocation(location)
    local startingPosition = 0
    local currentPosition = 0

    if gps.locate(2, false) then
        startingPosition = vector.new(gps.locate(2,false))
        currentPosition = startingPosition

        moveForward(1)
        currentPosition = vector.new(gps.locate(2,false))

        local difference = startingPosition - currentPosition

        local moving = ""

        if difference.x == -1 then
            moving = 3 -- east
        elseif difference.x == 1 then
            moving = 1 -- west
        end

        if difference.z == -1 then
            moving = 0 -- south
        elseif difference.z == 1 then
            moving = 2 -- north
        end

        if currentPosition.x > location.x then
            if moving == 0 then
                turtle.turnRight()
            elseif moving == 2 then
                turtle.turnLeft()
            elseif moving == 3 then
                turtle.turnRight()
                turtle.turnRight()
            end

            moving = 1

            while currentPosition.x ~= location.x do
                moveForward(1)
                turtle.digDown()
                if FindRails() then
                    turtle.select(FindRails())
                    turtle.placeDown()
                end
                currentPosition = vector.new(gps.locate(2, false))
            end
        else
            if moving == 0 then
                turtle.turnLeft()
            elseif moving == 2 then
                turtle.turnRight()
            elseif moving == 1 then
                turtle.turnRight()
                turtle.turnRight()
            end

            moving = 3

            while currentPosition.x ~= location.x do
                moveForward(1)
                turtle.digDown()
                if FindRails() then
                    turtle.select(FindRails())
                    turtle.placeDown()
                end
                currentPosition = vector.new(gps.locate(2, false))
            end
        end

        if currentPosition.z > location.z then -- needs to go north
            if moving == 0 then
                turtle.turnRight()
                turtle.turnRight()
            elseif moving == 1 then
                turtle.turnRight()
            elseif moving == 3 then
                turtle.turnLeft()
            end

            moving = 2

            while currentPosition.z ~= location.z do
                moveForward(1)
                turtle.digDown()
                if FindRails() then
                    turtle.select(FindRails())
                    turtle.placeDown()
                end
                currentPosition = vector.new(gps.locate(2, false))
            end
        else -- needs to go south
            if moving == 2 then
                turtle.turnRight()
                turtle.turnRight()
            elseif moving == 1 then
                turtle.turnLeft()
            elseif moving == 3 then
                turtle.turnRight()
            end

            moving = 0

            while currentPosition.z ~= location.z do
                moveForward(1)
                turtle.digDown()
                if FindRails() then
                    turtle.select(FindRails())
                    turtle.placeDown()
                end
                currentPosition = vector.new(gps.locate(2, false))
            end
        end
    end
end

if targetX and targetZ then
    local location = vector.new(targetX,0,targetZ)
    local currentPosition = vector.new(gps.locate(2, false))

    print("No. Rails: " .. CheckRail(location,currentPosition))

    if neededFuel(location,currentPosition) > turtle.getFuelLevel() then
        print("Cur Fuel: " .. turtle.getFuelLevel())
        print("Req Fuel: " .. neededFuel(location,currentPosition))
        print("Needed Fuel: " .. neededFuel(location,currentPosition) - turtle.getFuelLevel())
        return
    end

    MoveToLocation(vector.new(targetX,0,targetZ))
end