##############################################################################
# There are rats in the wall!
#
# When the player steps on the presure plate, the walls will crumble and
# release a horde of rats. Since the trap is always in a corridor, this
# should not be too hard, even for low-level chars.
#
# Inspriration taken from the H.P. Lovecraft-themed rougue-like Infra Arcana
{{
function callback.rats_trap_stepped(data, triggerable, triggerer, marker, ev)
  local x, y = marker:pos()

  if data.triggered == true then
     return
   end

  if dgn.mons_at(x,y) then
    if not you.see_cell(x, y) then
      return
    else
      data.triggered = true
      dgn.grid(x,y,"floor")
      crawl.mpr("You hear a faint click.")
      return
    end
  end

  data.triggered = true
  dgn.grid(x, y, "floor")

  for replica in iter.replica_iterator("hole", 1) do
      if not dgn.is_passable(replica.x,replica.y) then
        dgn.terrain_changed(replica.x, replica.y, "floor", false)
        dgn.create_item(replica.x, replica.y, "stone q:3 / stone q:2 / stone")
      else
        crawl.mpr("You hear a click.")
        return
      end
  end

  crawl.mpr("You step on to a pressure plate.")
  crawl.mpr("Suddenly a wall slides open!")

end

}}

NAME:   dk_rats_in_the_wall
DEPTH:  D:4-10
TAGS:   no_monster_gen
KPROP:  R = no_tele_into
MONS:   generate_awake rat, generate_awake river rat
SUBST:  R = 112
KFEAT:  ^ = pressure plate trap
# some chance for a big hole in the wall
: if crawl.one_chance_in(4) then
SUBST:  Z : z
: else
SUBST:  Z : x
: end
{{
local tm = TriggerableFunction:new{func="callback.rats_trap_stepped",
                                   repeated=true, data={triggered=false} }
tm:add_triggerer(DgnTriggerer:new{type="pressure_plate"})
lua_marker('^', tm)
lua_marker('z', props_marker { hole=1 })
}}
SUBST:  z : x
MAP
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@...^...@
xxxZzZxxx
xRRRRRRRx
xRRRRRRRx
xRRRRRRRx
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ENDMAP
