-- wget https://mc.cortan122.de/cc/stairs.lua

local mv = require("movement")
local place_walls = true
local building_block = "minecraft:polished_deepslate"

local function placeOshaWall()
  if not place_walls then return end
  if not turtle.detect() then
    mv.placeItem(building_block, turtle.place)
  end
end

local function placeOshaWall_side(left, right)
  if place_walls then
    left()
    placeOshaWall()
    right()
  end
end

local function superDig()
  mv.dig()
  mv.forward()
  mv.digUp()
  mv.digDown()
end

local function placeTorch()
  mv.turnRight()
  mv.placeItem("torch", turtle.placeUp)
  mv.turnLeft()
end

local function placeStairs(left, right)
  mv.down()
  if not turtle.detectDown() then
    mv.placeItem(building_block, turtle.placeDown)
  end
  placeOshaWall_side(left, right)
  mv.up()
  mv.placeItem("stairs", turtle.placeDown)
  placeOshaWall_side(left, right)
end

local function digForward()
  mv.dig()
  mv.forward()
end

local function doubleWideStair(direction, direction_other)
  superDig()
  placeStairs(mv.turnRight, mv.turnLeft)
  direction(superDig)
  placeStairs(mv.turnLeft, mv.turnRight)
  mv.up()
  placeOshaWall_side(mv.turnLeft, mv.turnRight)
  mv.digUp()
  mv.up()
  placeOshaWall_side(mv.turnLeft, mv.turnRight)
  mv.digUp()
  direction_other(digForward)
  placeOshaWall_side(mv.turnRight, mv.turnLeft)
  mv.digUp()
  mv.down()
  placeOshaWall_side(mv.turnRight, mv.turnLeft)
end

local function placeFloor()
  if not turtle.detectDown() then
    mv.placeItem(building_block, turtle.placeDown)
  end
end

local function digWithFloor()
  mv.dig()
  mv.forward()
  mv.digUp()
  placeFloor()
end

local function doubleWideTunnel(direction)
  digWithFloor()
  direction(digWithFloor)
end

local function buildStairs(y_start, y_end)
  local dy = y_end - y_start
  local stairs = dy*2
  local walls = stairs*4
  print(string.format("we need %d torches", dy/6))
  print(string.format("and we need %d stairs (%0.1f stacks)", stairs, stairs/64))
  if place_walls then
    print(string.format("and we also need %d walls (%0.1f stacks)", walls, walls/64))
  end

  for i=1,dy do
    doubleWideStair(mv.moveLeft, mv.moveRight)
    if i % 6 == 0 then placeTorch() end
  end
end

local function digTunnel(x_start, x_end)
  local dx = (x_end - x_start)/2
  print(string.format("we need %d torches", dx/4))

  for i=1,dx do
    doubleWideTunnel(mv.moveLeft)
    doubleWideTunnel(mv.moveRight)
    if i % 4 == 0 then placeTorch() end
  end
end

local function usage()
  print("usage: stairs [stairs|tunnel] [start_x] [end_x]")
end

local function main(args)
  if #args <= 1 or #args > 3 then
    usage()
    print("got the wrong number of args...")
  elseif args[1] == "stairs" then
    if #args == 3 then
      buildStairs(tonumber(args[2]), tonumber(args[3]))
    else
      buildStairs(0, tonumber(args[2]))
    end
  elseif args[1] == "tunnel" then
    if #args == 3 then
      digTunnel(tonumber(args[2]), tonumber(args[3]))
    else
      digTunnel(0, tonumber(args[2]))
    end
  else
    usage()
    print("unknown command...")
  end
end

local args = {...}
main(args)