--------------------------------------------------------------------------
-- vault.lua: Vault helper functions from more than one file.
--------------------------------------------------------------------------

-- Counting Pan runes for Ignacio and for exits.
function count_pan_runes()
  local runes = 0
  for _, r in ipairs({"demonic","glowing","magical","fiery","dark"}) do
    if you.have_rune(r) then
      runes = runes + 1
    end
  end
  return runes
end

-- Functionality for some of HangedMan's decor vaults.
function init_hm_decor_walldepth(e, variables)
local a = you.absdepth() * 5
  if a - 75 > 0 then
    e.subst(variables .. " : x:50 c:" .. a .. " b:" .. a - 75)
  else
    e.subst(variables .. " : x:50 c:" .. a)
  end
end

-- Functionality for Kennysheep vaults.
-- c: outer vault walls
-- x: inner vault walls (could be see-through blocks, or not there at all)
-- t: doodads. fountains, statues or the more decorative walls. Sometimes get replaced by normal walls
-- w: water or lava or trees. or nothing
-- D/F opposite/adjacent vault entrances, that may or may not be there
-- E/H placed in front of the alternate doors. become w tiles if there's no door there

function ks_random_setup(e, norandomexits)
    e.tags("no_pool_fixup")
    -- 1/2 chance the adjacent door is there, followed by a 1/2 chance every
    -- side has a door.
    if norandomexits == nil then
        e.tags("transparent")
        if crawl.one_chance_in(2) then
            e.subst("D : +")
            e.subst("E : .")
            if crawl.one_chance_in(2) then
                e.subst("F : +")
                e.subst("H : .")
            else
                e.subst("F : c")
                e.subst("H : w")
            end
        else
            e.subst("DF : c")
            e.subst("EH : w")
        end
    end
    --rooms have a 1/2 chance of being bordered by water or trees
    --q is used as a placeholder for trees to keep them from being
    -- re-selected in the next step.
    e.subst("w : w.")
    e.subst("w : wwwWWqt")
    --room setups:
    --0 : doodads replaced with walls
    --1 : walls replaced with water/lava or removed. doodads may or may not be walls
    --2 : doodads picked from more obvious vault decorations
    selected = crawl.random2(3)
    if selected == 0 then
        e.subst("t : x")
        e.subst("x : cvbttm")
    elseif selected == 1 then
        e.subst("x : ..wW")
        e.subst("t : .TmbttwG")
    elseif selected == 2 then
        e.subst("t : .TttG")
        e.subst("x : cvbtt")
    end
    -- Turn q into t for tree borders.
    e.subst("q : t")
    -- The outer walls are probably stone or rock, but can be metal or crystal.
    e.subst("c : ccccxxxxvb")
    -- One chance in three of turning all water on the floor into lava.
    -- Tree and fountain tiles are changed so the vault looks normal.
    if crawl.one_chance_in(3) then
        e.subst("Wwt : l")
        e.subst("T : V")
    end
end

-- the Serpent should appear in exactly one hell end
-- XXX: are things like shafts going to break this?
function hell_branches_remaining()
   local hell_branches = { "Geh", "Coc", "Dis", "Tar" }
   local ret = #hell_branches
   for _, branch in ipairs(hell_branches) do
      if travel.find_deepest_explored(branch) == 7 then
         ret = ret - 1
      end
   end
   return ret
end

function serpent_of_hell_setup(e)
   if not you.uniques("the Serpent of Hell") and
      crawl.one_chance_in(hell_branches_remaining()) then
      e.kmons('D = the Serpent of Hell')
   end
end

-- Guarantee two rare base types with a brand
function halls_of_blades_weapon(e)
  local long_blade_type = crawl.one_chance_in(2) and "double sword"
                                                  or "triple sword"
  local types = {"quick blade", long_blade_type,
                 "executioner's axe", "eveningstar", "bardiche",
                 "lajatang"}
  local egos = {"flaming", "freezing", "electrocution", "venom",
              "holy_wrath", "pain", "vampirism", "draining",
              "antimagic", "distortion"}
  local weapon1 = util.random_from(types)
  local weapon2 = weapon1
  while weapon2 == weapon1 do
    weapon2 = util.random_from(types)
  end
  local ego1 = util.random_from(egos)
  local ego2 = ego1
  while ego2 == ego1 do
    ego2 = util.random_from(egos)
  end

  e.mons("dancing weapon; good_item " .. weapon1 .. " ego:" .. ego1)
  e.mons("dancing weapon; good_item " .. weapon2 .. " ego:" .. ego2)
end
