layerCraft

--functions

function initialise()
    currentX = 0
    currentY = 0
    currentZ = 0
    currentDir = 0
    fuelThreshold = 10
    fuelSlot = 1
    firstBlockSlot = 2
    canContinue = true
end

function checkFuel()
    if turtle.getFuelLevel() < fuelThreshold then
        turtle.select(fuelSlot)
        if turtle.refuel(1) == false then
            print ("Waiting for fuel...")
        end
        while turtle.refuel(1) == false do
        end
    else
        print ("No fuel necessary, foolish human")
    end
    print ("I have " .. turtle.getFuelLevel() .. " fuulez")
end

function getNextSlot()
    local i=turtle.getSelectedSlot()
    while turtle.getItemCount(i) == 0 do
        i = i + 1
        if i > 16 then
            i = firstBlockSlot
        end
        turtle.select(i)
    end
end

function moveNPlace()
    moveBackwardsXWait()
    turtle.place()
end

function turnCorner
    moveBackwardsYWait()
    turtle.place()


function moveBackwardsXWait()
    while moveBackwardsX(1) ~= 1 do
    end
end

function moveBackwardsYWait()
    while moveBackwardsY(1) ~= 1 do
    end
end

function whereAmI()
    print ("I am at" .. " " .. currentX .. "X" .. "," .. currentY .. "Y" .. "," .. currentZ .. "Z," .. " Direction:" .. currentDir)
end

function moveUp(a)
    local i=1
    for i=1,a do
        if turtle.up() == true then
            currentZ = currentZ + 1
        end
    end
    whereAmI()
end

function moveDown(a)
    local i=1
    for i=1,a do
        if turtle.down() == true then
            currentZ = currentZ - 1
        end
    end
    whereAmI()
end

function moveZ(a)
    if a < 0 then
        moveDown(-a)
    elseif a > 0 then
        moveUp(a)
    else
    end
end

function turnRight(a)
    local i=1
    for i=1,a do
        turtle.turnRight()
        currentDir = currentDir + 1
        if currentDir == 4 then
            currentDir = 0
        end
    end
    whereAmI()
end

function turnLeft(a)
    local i=1
    for i=1,a do
        turtle.turnLeft()
        currentDir = currentDir - 1
        if currentDir == -1 then
            currentDir = 3
        end
    end
    whereAmI()
end

function setDirection(a)
    local diffTurn = a - currentDir
    if diffTurn < 0 then
        diffTurn = diffTurn + 4
    end
    if diffTurn ~= 0 then
        turnRight(diffTurn)
    end
end

function moveForwardX(a)
    local i=1
    if a > 0 then
        setDirection(0)
        for i=1,a do
            if turtle.forward() == true then
                currentX = currentX + 1
            end
        end
    elseif a < 0 then
        setDirection(2)
        for i=-1,a,-1 do
            if turtle.forward() == true then
                currentX = currentX - 1
            end
        end
    else
    end
    whereAmI()
end

function moveBackwardsX(a)
    local i=1
    local howfar=0
    if a > 0 then
        setDirection(0)
        for i=1,a do
            if turtle.back() == true then
                currentX = currentX - 1
                howfar = howfar + 1
            end
        end
    elseif a < 0 then
        setDirection(2)
        for i=-1,a,-1 do
            if turtle.back() == true then
                currentX = currentX + 1
                howfar = howfar + 1
            end
        end
    else
    end
    whereAmI()
    return howfar
end

function moveForwardY(a)
    local i=1
    if a > 0 then
        setDirection(1)
        for i=1,a do
            if turtle.forward() == true then
                currentY = currentY + 1
            end
        end
    elseif a < 0 then
        setDirection(3)
        for i=-1,a,-1 do
            if turtle.forward() == true then
                currentY = currentY - 1
            end
        end
    else
    end
    whereAmI()
end

function moveBackwardsY(a)
    local i=1
    local howfar = 0
    if a > 0 then
        setDirection(3)
        for i=1,a do
            if turtle.back() == true then
                currentY = currentY - 1
                howfar = howfar + 1
            end
        end
    elseif a < 0 then
        setDirection(1)
        for i=-1,a,-1 do
            if turtle.back() == true then
                currentY = currentY + 1
                howfar = howfar + 1
            end
        end
    else
    end
    whereAmI()
    return howfar
end

function goTo(x,y,z)
    local diffX = x - currentX
    local diffY = y - currentY
    local diffZ = z - currentZ

    moveForwardX(diffX)
    moveForwardY(diffY)
    moveZ(diffZ)
end

initialise()
while true do
    moveBackwardsXWait()
end