os.loadAPI("apis/tortoise.lua")
local id,x,z = ...
id = tonumber(id)
x = tonumber(x)
z = tonumber(z)

local function digRow(l, d)
    if d==1 then
        tortoise.forceForward(l)
    else
        tortoise.forceBack(l)
    end
end

local position = {}
position.x = 0
position.y = 0
position.z = 0

tortoise.forceForward()
tortoise.forceDown()
position.y=1
if id==2 then
    tortoise.turnRight()
    tortoise.forceForward(z/2)
    tortoise.turnLeft()
    tortoise.forceDown(1)
    position.x = 1

    position.z = z/2

elseif id==3 then
    tortoise.forceForward((x/2) - 1)
    tortoise.forceDown(2)
    position.x = x/2
    position.z = 1
elseif id==4 then
    tortoise.forceForward((x/2) - 1)
    tortoise.turnRight()
    tortoise.forceForward(z/2)
    tortoise.turnLeft()
    tortoise.forceDown(3)
    position.x = x/2
    position.z = z/2
end

local function returnHome()
    print(position.x)
    print(position.y)
    print(position.z)
    tortoise.forceUp(position.y)
    tortoise.forceForward(position.z)
    tortoise.turnRight()
    tortoise.forceForward(position.x)

end

while true do
    for i=1,(x/2) do
        digRow((z/2)-1, 1)
        if i%2==1 then position.z = position.z + (z/2)
        else position.z = position.z - (z/2) end
        if (i)%2==1 then tortoise.turnRight()
        else tortoise.turnLeft() end
        if not(i == x/2) then
            tortoise.forceForward()
        else position.x = position.x + 1 end

        if (i)%2==1 then tortoise.turnRight()
        else tortoise.turnLeft() end
    end
    tortoise.forceDown()
    position.y = position.y + 1
    returnHome()
    return
end