rect2

depth, width, height, h_offset = ...
if depth == nil then
    depth = 2
end
if width == nil then
    width = 2
end
if height == nil then
    height = 2
end
if h_offset == nil then
    h_offset = 0
end

width_dir = 'r'
timesHorizontal = depth*width
turnAgain = false
height_dir = 'u'
height_traveled = 0
facing = 'f'
num_moves = 0

function refuel()
    for i = 1, 16 do
        turtle.select(i)
        turtle.refuel()
    end
end

function forward()
    if height_traveled < 2 then
        while not turtle.forward() do  --this loop runs as long as turtle.forward() return false
            turtle.dig() --dig its way through
            sleep(0.8) --i think this is falling time of gravel
        end
    else
        turtle.dig()
        turtle.forward()
    end
    num_moves = num_moves + 1
    if turtle.getFuelLevel() < 500 then
        refuel()
    end
end

function right()
    turtle.turnRight()
    if facing == 'f' then
        facing = 'r'
    elseif facing == 'r' then
        facing = 'b'
    elseif facing == 'b' then
        facing = 'l'
    elseif facing == 'l' then
        facing = 'f'
    end
end

function left()
    turtle.turnLeft()
    if facing == 'f' then
        facing = 'l'
    elseif facing == 'l' then
        facing = 'b'
    elseif facing == 'b' then
        facing = 'r'
    elseif facing == 'r' then
        facing = 'f'
    end
end

function horizontal(start)
    for i = start, timesHorizontal do
        forward()

        if turnAgain == true then
            if width_dir == 'r' then
                right()
                width_dir = 'l'
            else
                left()
                width_dir = 'r'
            end
            turnAgain = false
        end

        if i % depth == 0 and i < timesHorizontal then
            if width_dir == 'r' then
                right()
            else
                left()
            end
            turnAgain = true
        end
    end
end

function vertical()
    for i = 1, height do
        height_traveled = height_traveled + 1
        if i == 1 then
            horizontal(1)
        else
            right()
            right()
            turtle.digDown()
            turtle.down()
            horizontal(2)
        end
    end
end

function home()
    start = 1

    for i = 2, height do
        turtle.up()
    end

    if facing == 'f' then
        left()
        for i = 2, width do
            forward()
        end
        left()
    elseif facing == 'r' then
        left()
        left()
        for i = 2, width do
            forward()
        end
        left()
    elseif facing == 'l' then
        left()
    elseif facing == 'b' then
        start = 2
    end

    for i = start, depth do
        forward()
    end
end

function drop()
    for i = 1, 16 do
        turtle.select(i)
        turtle.drop()
    end
end

function init()
    refuel()
    vertical()
    -- home()
    -- drop()
end

init()