-- This program will allow a turtle to build a wall,
-- you must give the turtle enough blocks to build the wall.

-- Usage: wall.lua length height

input = {...}
Largeur = tonumber(input[1])
Longueur = tonumber(input[2])

-- The starting slot to look for building materials (from left to right, top to bottem)
--ie. 1 2 3
--    4 5 6
--    7 8 9
currentSlot = 2

-- This is a function, it is peice of script that we will run later.
-- If this inventory slot runs out of building blocks, move to the next slot.

function checkFuel(currentSlot)
    if turtle.getFuelLevel() <= 100 then
        if turtle.getItemCount(1) == 0 then
            print("Out of fuel.")
            exit()
        else
            turtle.select(1)
            turtle.refuel(1)
            turtle.select(currentSlot)
        end --if
    end --if
end --checkFuel()

function gotoNextSlotIfEmpty()
  if turtle.getItemCount(currentSlot) == 0 then
    currentSlot = currentSlot + 1
    turtle.select(currentSlot)
  end
end

-- This is where the code starts running.
turtle.select(currentSlot)

for la = 1, Largeur do

  for lo = 1, Longueur do
    checkFuel(currentSlot)
    turtle.placeDown()
    gotoNextSlotIfEmpty() -- This call runs the function above, functions must be placed above where they are used.
    if lo ~= Longueur then --  ~= means 'not equal'
      turtle.forward()
    end

  end

-- retour
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()

  for lo = 1, Longueur do

    turtle.placeDown()
    gotoNextSlotIfEmpty() -- This call runs the function above, functions must be placed above where they are used.
    if lo ~= Longueur then --  ~= means 'not equal'
      turtle.forward()
    end

  end


  if la ~= Largeur/2 then
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
  end
end