BuildingRoutine

nRoomWidth = 5
nRoomLength = 5

nRoomHeight = 3

-- BASIC MOVEMENT METHODS --
function placeThenMoveLeft()
    turtle.placeDown()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
end

function placeThenMoveRight()
    turtle.placeDow()
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
end

function turnAround()
    turtle.turnRight()
    turtle.turnRight()
end
----------------------------

function buildRoof(nWidth, nLength)
    turtle.up()

    for nLine=1, nLength do
        for nBlock=1, nWidth-1 do
            placeThenMoveLeft()
        end
        turtle.placeDown()

        turtle.forward()
        if nLine ~= nLength then
            turtle.placeDown()
        end
        turtle.turnRight()
        for nPositionInLine=nWidth-1, 1, -1 do
            turtle.forward()
        end
        turtle.turnLeft()
    end

    -- Return to the starting position.
    turnAround()
    for nPositionInLength=nLength, 1, -1 do
        turtle.forward()
    end
    turnAround()
end

function buildLayer(nWidth, nLength)
    turtle.up() -- Get above the space to build.
    -- Build the solid outer line first.
    -- +-----+
    -- |     |
    -- +-----x <-
    for nBlock=1, nWidth-1 do
        placeThenMoveLeft()
    end
    turtle.placeDown()
    ---------------
    -- +-----+
    -- |     |
    -- xXXXXXX
    --
    -- Get the turtle in position to build the inner layers.
    turtle.forward()

    -- Build the inner layers of the room.
    for nLine=1, nLength-2 do
        turtle.placeDown()
        turtle.turnRight()
        for nPositionInLine=1, nWidth-1 do
            turtle.forward()
        end
        turtle.turnLeft()
        turtle.placeDown()

        turtle.forward()
        turtle.turnLeft()
        for nPositionInLine=nWidth-1, 1, -1 do
            turtle.forward()
        end
        turtle.turnRight()
    end
    -- x-----+
    -- X     X
    -- XXXXXXX

    -- Build the final solid outer line.
    turtle.placeDown()
    turtle.turnRight()
    for nPositionInLine=nWidth-1, 1, -1 do
        turtle.forward()
        turtle.placeDown()
    end
    turtle.turnLeft()
    turtle.placeDown()
    -- XXXXXXx
    -- X     X
    -- XXXXXXX

    -- Return to the original position of the turtle.
    turnAround()
    for nPositionInLength=nLength-1, 1, -1 do
        turtle.forward()
    end
    turnAround()
end

function buildStructure(nWidth, nLength, nHeight)
    for nCurrentHeight=1, nHeight do
        buildLayer(nWidth, nLength)
    end
    buildRoof(nWidth, nLength)
end

buildStructure(nRoomWidth, nRoomLength, nRoomHeight)