-- like cube, but uses pathfinding

local mv = require("movement")
local pathfind = require("pathfind")

local function obstacle(node)
  if node.z < 0 and node.z > -10 and node.x < 10 and node.x > -10 then
    return true
  end
  if node.x <= 0 and node.x > -10 and node.y < 5 and node.y > -5 and node.z < 10 then
    return true
  end
  return pathfind.obstacle.stone(node)
end

local function moveTo(offset)
  pathfind.forcePath(offset, obstacle)
end

local function dropStuffOff()
  local prev_pos,prev_face = mv.getPosition()
  moveTo(vector.new(0,0,0))
  mv.face(0, -1)
  mv.dumpInventory()
  moveTo(prev_pos)
  mv.face(prev_face.x, prev_face.z)
end

local function callback()
  if mv.isInventoryFull() then dropStuffOff() end
end

local function digCube(depth, height, width)
  if height < 3 or width <= 0 or depth <= 0 then
    print("sorry, your cube is too small")
    return
  end

  pathfind.addExclusionZone(vector.new(-1,-5,-5), vector.new(-5,5,5))

  -- todo: don't hardcode the offset
  local offset = vector.new(-2 - depth, -78, 0)
  pathfind.cube(offset, depth, height, width, obstacle, callback)

  dropStuffOff()
  moveTo(vector.new(0,0,0))
  mv.face(1,0)
end

local function main(args)
  if #args == 0 then
    digCube(60,9,60)
  elseif #args == 1 then
    local n = tonumber(args[1])
    digCube(n,n,n)
  elseif #args == 3 then
    digCube(tonumber(args[1]), tonumber(args[2]), tonumber(args[3]))
  else
    print("usage: quarry [depth] [height] [width]")
    print("got the wrong number of args...")
  end
end

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