function start()
  write("Longueur ?")
  longueur = read()
  longueurs = tonumber(longueur)
  if longueurs >= 4 then
    write("Combien de chemin ?")
    chemin = read()
    chemins = tonumber(chemin)
    if chemins >= 1 then
      write("Quel est le slot du charbon ?")
      coal_slot = read()
      coal_slot = tonumber(coal_slot)
      write("Nous allons faire : " .. chemin .. " chemins de " .. longueur .. " longueur.")
      coal()
    end
  else
    write("Cela doit être un nombre plus grand que 3")
  end
end

function coal()

  moves = longueurs * chemins + 3 * chemins
  active_coal = turtle.getFuelLevel()
  active_coal = tonumber(active_coal)
  if moves > active_coal then
    coal = moves - active_coal
    coal = coal / 80
    coal = math.ceil(coal)
    write("Active coal : " .. active_coal .. " moves : " .. moves .. " coal: " .. coal .. " slot : " .. coal_slot .. " count : " .. turtle.getItemCount(coal_slot))
    if turtle.getItemCount(coal_slot) >= coal then
      turtle.select(coal_slot)
      turtle.refuel(coal)
      mine()
    else
      write("Veuillez insérer " + coal + " charbons dans le slot " + coal_slot)
      os.sleep(6)
      coal()
    end
  else
    mine()
  end
end

function deposing()
  turtle.dig()
  turtle.select(1)
  turtle.place()
  for i = 2,16 do
    turtle.select(i)
    turtle.drop()
  end
  turtle.select(1)
  turtle.dig()
end

function mine()
  blocks = 0
  for i = 1, chemin do
    for c = 1, longueur do
      graphic()
      if turtle.getItemCount(16) == 0 then
        turtle.dig()
        blocks++
        turtle.forward()
        turtle.digUp()
        blocks++
      else
        deposing()
      end
    end
    if (i%2 == 0) then
      turtle.turnRight()
      turtle.dig()
      blocks++
      turtle.forward()
      turtle.digUp()
      blocks++
      turtle.dig()
      blocks++
      turtle.forward()
      turtle.digUp()
      blocks++
      turtle.dig()
      blocks++
      turtle.forward()
      turtle.digUp()
      blocks++
      turtle.turnRight()
    else
     turtle.turnLeft()
     turtle.dig()
     blocks++
      turtle.forward()
      turtle.digUp()
      blocks++
      turtle.dig()
      blocks++
      turtle.forward()
      turtle.digUp()
      blocks++
      turtle.dig()
      blocks++
      turtle.forward()
      turtle.digUp()
      blocks++
      turtle.turnLeft()
    end
  end
end
function graphic()
  term.setBackgroundColor(colours.black)
  term.clear()
  term.setCursorPos(1,1)
  print("Il reste " .. moves .. " mouvements")
  print("Il reste " .. turtle.getFuelLevel().. " de fuel")
  print(blocks .. "on deja ete mines")
end
start()