function describe(prefix,stuff) 
   local t=type(stuff)
   if(t == "table") then
	 for key,value in pairs(stuff) do
	    minetest.log(prefix.." "..key .. "=".. type(value))
	    describe(prefix.."  ",value)
	    end
   elseif(t=="nil" or t=="userdata") then
      minetest.log(prefix.." "..t)
   elseif(t=="number" or t=="string" or t=="boolean") then
	 minetest.log(prefix.." "..value)
   else
      minetest.log(t)
   end
end

local cardgroups = { crumbly=1, falling_node=1, dig_immediate=3, card=1 }
local pilegroups = { crumbly=1, dig_immediate=3 }


local suit = { "club","diamond","heart","spade" }
local suitcolorizeindex={ 2,1,1,2}
	    
local suitcolorize = { "\\^[colorize\\:#ff0000\\:alpha","\\^[colorize\\:#000000\\:alpha" }
local rank = { "Ace","Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten",
		  "Jack","Queen","King"}
local rank_short = { "a","2","3","4","5","6","7","8","9","t","j","q","k" }

local card_shortname = {}
local textures = {}

local descriptions = {}
local cardnames = {}
local cardprefix="deck:card_"
local cardprefixlen=string.len(cardprefix)
local carddescriptions = {}
local texturepositions = {
   {"50,50"}, -- a
   {"50,15","50,65"}, -- 2
   {"50,2","50,42","50,84"}, -- 3
   {"30,12","30,62","70,12","70,62"}, -- 4
   {"30,2","80,2","60,40","35,75","85,75"}, -- 5
   {"30,2","30,42","30,84","70,2","70,42","70,84"}, -- 6
   {"40,2","40,42","40,84","80,2","80,42","80,84","5,62"}, -- 7
   {"40,2","40,42","40,84","80,2","80,42","80,84","2,84","2,42"}, -- 8
   {"48,2","48,42","48,84","88,2","88,42","88,84","10,84","10,42","10,2"}, -- 9
   {"48,2","48,42","48,84","88,2","88,42","88,84","10,84","10,42","20,12","60,52"}, -- 10
   {"33,1"}, -- J
   {"33,1"}, -- Q
   {"33,1"}, -- K
}

local function generate_descriptions()
   local i=1
   local s, r
   for s=1,4,1 do
      for r=1,13,1 do
	 descriptions[i]=rank[r].." of "..suit[s].."s"
	 card_shortname[i]=rank_short[r]..string.sub(suit[s],1,1)
	 textures[i]="deck_white.png^[combine:128x128"
	 for p=1,table.getn(texturepositions[r]),1 do
	    textures[i]=textures[i]..":"..texturepositions[r][p].."=deck_"..suit[s]..".png"
	 end
	 textures[i]=textures[i]..
	    ":0,0=deck_"..rank_short[r]..".png"..suitcolorize[suitcolorizeindex[s]]
	 i=i+1
      end
   end
end

local function pile_add_card(inv,cardname)
   local s=inv:get_size("main")
   local place=s
   local i
   for i=1,s,1 do
      local stack=inv:get_stack("main",i)
      if stack:get_count() > 0 then
	 place=i-1
	 break
      end
   end
   if place > 0 then
      inv:set_stack("main",place,cardname)
      minetest.log("deck_add_card done")
      return true
   end
   return false
end

local function pile_add_card_from_pos(inv,pos)
   local cardname=ItemStack(minetest.get_node(pos).name)
   return pile_add_card(inv,cardname)
end

local function flip_card(pos,formname,fields,sender)
   local n=minetest.get_node(pos)
   local pile
   if fields.to_stockpile then
      pile="deck:stockpile"
   elseif fields.to_chestpile then
      pile="deck:chestpile"
   else
      minetest.log("not flipped")
      return
   end
   minetest.log(n.name.." to "..pile)
   minetest.remove_node(pos)
   minetest.place_node(pos,{name=pile})
   local meta=minetest.get_meta(pos)
   local inv=meta:get_inventory()
   pile_add_card(inv,n.name)
   minetest.close_formspec(sender:get_player_name(),"")
end

generate_descriptions()
for i = 1,table.getn(textures),1 do
   local name=cardprefix..card_shortname[i]
   table.insert(cardnames,name)
   carddescriptions[name]=descriptions[i]
   minetest.register_node(name, {
			     description = descriptions[i],
			     groups = cardgroups,
			     palette = "deck_palette.png",
			     paramtype2 = "color",
			     drawtype = "color",
			     param2 = 4,
			     on_construct = function(pos)
				local meta=minetest.get_meta(pos)
				meta:set_string("formspec", "size[3,3]"..
						   "label[0,0;Flip card to make a]"..
						   "button[0,1;2,1;to_stockpile;Stockpile]"..
						   "button[0,2;2,1;to_chestpile;Chestpile]")
			     end,
			     on_receive_fields = flip_card,
			     tiles = { textures[i] }
   })
end

local function pile_inv_setup(pos, placer, itemstack, pointed_thing)
   local meta=minetest.get_meta(pos)
   local inv=meta:get_inventory()
   local invsize=13*4
   if inv:set_size("main",invsize) then
      inv:set_width("main",13)
      minetest.log("deck_setup: size set to "..invsize)
   else
      minetest.log("deck_setup: failed to set size")
   end

   --for i=1,invsize,1 do
   --   local stack=inv:get_stack("main",i)
   --end
end

local function pile_pop(inv) 
   local s=inv:get_size("main")
   local i
   for i=1,s,1 do
      local stack=inv:get_stack("main",i)
      if stack:get_count() > 0 then
	 local item=stack:take_item(1)
	 inv:set_stack("main",i,stack)
	 return item
      end
   end
end

local function pile_peek_first(inv) 
   local s=inv:get_size("main")
   for i=1,s,1 do
      local stack=inv:get_stack("main",i)
      if stack:get_count() > 0 then
	 return stack:get_name()
      end
   end
end


local function add_to_inv(inv, cardname)
   local s=inv:get_size("main")
   for i=1,s,1 do
      local stack=inv:get_stack("main",i)
      if stack:get_count() == 0 then
	 minetest.log(cardname)
	 inv:set_stack("main",i,ItemStack(cardname))
	 return true
      end
   end
   return false
end

local function darken_pile(pos)
   minetest.log("darken pile: "..minetest.pos_to_string(pos))
   local node=minetest.get_node(pos)
   node.param2=1
   minetest.set_node(pos,node)
end

local function lighten_pile(pos)
   minetest.log("darken pile: "..minetest.pos_to_string(pos))
   local node=minetest.get_node(pos)
   node.param2=0
   minetest.set_node(pos,node)
end

local function defragment_pile(pos)
   local meta=minetest.get_meta(pos)
   local pile_inv=meta:get_inventory()
   local s=pile_inv:get_size("main")
   local search_start=s-1
   for i=s,1,-1 do
      minetest.log("defrag:"..i)
      local stack=pile_inv:get_stack("main",i)
      if stack:is_empty() then
	 for j=search_start,1,-1 do
	    local st=pile_inv:get_stack("main",j)
	    if st:is_empty() then
	       minetest.log("defrag: empty stack i="..i.." j="..j)
	    else
	       pile_inv:set_stack("main",i,st)
	       pile_inv:set_stack("main",j,ItemStack())
	       minetest.log("defrag:move"..j.."->"..i)
	       search_start=j-1
	       if search_start==0 then
		  minetest.log("defrag:exit at i="..i)
		  return
	       end
	       break
	    end
	    if j==1 then
	       minetest.log("defrag:exit at j=1")
	       return
	    end
	 end
      elseif search_start > i-1 then
	 search_start=i-1
      end
   end
end

local function put_all_to_pile(pos,formname,fields,sender)
   local player_inv=minetest.get_inventory({type="player", name=sender:get_player_name()})
   local meta=minetest.get_meta(pos)
   local pile_inv=meta:get_inventory()
   local s=player_inv:get_size("main")
   local i
   if pile_peek_first(pile_inv) == nil then
      lighten_pile(pos)
   end
   for i=1,s,1 do
      local stack=player_inv:get_stack("main",i)
      if stack:get_count() > 0 then
	 local cardname=stack:get_name()
	 if string.sub(cardname,1,cardprefixlen) == cardprefix then
	    local item=stack:take_item(1)
	    if item ~= nil then
	       add_to_inv(pile_inv, cardname)
	       player_inv:set_stack("main",i,stack)
	    end
	 end
      end
   end
   if pile_peek_first(pile_inv) == nil then
      darken_pile(pos)
   else
      defragment_pile(pos)
   end
end

local function draw_one_card(pos,formname,fields,sender)
      local player_inv=minetest.get_inventory({type="player", name=sender:get_player_name()})
      local meta=minetest.get_meta(pos)
      local pile_inv=meta:get_inventory()
      if pile_inv == nil then minetest.log("pile inv=nil") return end
      local stack=pile_pop(pile_inv)
      if stack == nil then
	 minetest.log("empty pile")
	 darken_pile(pos)
	 return false
      else
	 player_inv:add_item("main",stack)
	 if pile_peek_first(pile_inv) == nil then
	    darken_pile(pos)
	 else
	    defragment_pile(pos)
	 end
	 return true
      end
end

local function shuffle_pile(pos,formname,fields,sender)
      local meta=minetest.get_meta(pos)
      local pile_inv=meta:get_inventory()
      local s=pile_inv:get_size("main")
      local newpos={}
      local i
      for i=1,s,1 do
	 local try=math.random(s)
	 while newpos[try] ~= nil do
	    try=try+1
	    if try > s then
	       try=1
	    end
	 end
	 newpos[try]=pile_inv:get_stack("main",i)
      end
      for i=1,s,1 do
	 pile_inv:set_stack("main",i,newpos[i])
      end
      defragment_pile(pos)
end

local function convert_pile(pos,nodename)
   local oldmeta=minetest.get_meta(pos)
   local oldinv=oldmeta:get_inventory()
   local s=oldinv:get_size("main")
   local cards={}
   for i=1,s,1 do
      local stack=oldinv:get_stack("main",i)
      cards[i]=stack:get_name()
   end
   minetest.remove_node(pos)
   minetest.place_node(pos,{name=nodename})
   local newmeta=minetest.get_meta(pos)
   local newinv=newmeta:get_inventory()
   local s=oldinv:get_size("main")
   for i=1,s,1 do
      local stack=ItemStack(cards[i])
      newinv:set_stack("main",i,stack)
   end
   defragment_pile(pos)
end

local function draw_card(pos,formname,fields,sender)
   if fields.draw then
      return draw_one_card(pos,formname,fields,sender)
   elseif fields.drawall then
      while draw_one_card(pos,formname,fields,sender) do
      end
   elseif fields.shuffle then
      shuffle_pile(pos,formname,fields,sender)
   elseif fields.tostock then
      minetest.close_formspec(sender:get_player_name(),"")
      convert_pile(pos,"deck:stockpile")
   elseif fields.alltopile then
      put_all_to_pile(pos,formname,fields,sender)
   end
end


local function on_dig_pile_getcards(pos,node,digger)
   local meta=minetest.get_meta(pos)
   local pile_inv=meta:get_inventory()
   local player_inv=minetest.get_inventory({type="player", name=digger:get_player_name()})
   local stack=pile_pop(pile_inv)
   while stack ~= nil do
	player_inv:add_item("main",stack)
	stack=pile_pop(pile_inv)
   end
   minetest.remove_node(pos)
end

local function on_dig_pile_getpile(pos,node,digger)
   local meta=minetest.get_meta(pos)
   local pile_inv=meta:get_inventory()
   local player_inv=minetest.get_inventory({type="player", name=digger:get_player_name()})
   local new_chestpile=ItemStack("deck:chestpile")
   local stackmeta=new_chestpile:get_meta()
   local i=1
   local cardstack=pile_pop(pile_inv)
   if cardstack == nil then
      stackmeta:set_string("description","Empty pile")
      minetest.remove_node(pos)
      return
   end
   local descr=""
   while cardstack ~= nil do
      local cardname=cardstack:get_name()
      minetest.log("getpile: got "..cardname)
      stackmeta:set_string(i,cardname)
      cardstack=pile_pop(pile_inv)
      descr=descr..", "..carddescriptions[cardname]
      i=i+1
   end
   stackmeta:set_string("description",string.sub(descr,3))
   player_inv:add_item("main",new_chestpile)
   minetest.remove_node(pos)
end

local function after_place_pile(pos,placer,itemstack,pointed_thing)
   local stackmeta=itemstack:get_meta()
   local i=1
   local card=stackmeta:get_string(i)
   if card == nil then
      stackmeta:set_string("description","Empty pile")
      darken_pile(pos)
      return
   end
   local pilemeta=minetest.get_meta(pos)
   local pile_inv=pilemeta:get_inventory()
   local descr=""
   while card ~= "" do
      minetest.log("after_place_pile: i="..i.." card="..card)
      pile_add_card(pile_inv,card)
      descr=descr..", "..carddescriptions[card]
      i=i+1
      card=stackmeta:get_string(i)
   end
   stackmeta:set_string("description",string.sub(descr,3))
end

minetest.register_node("deck:chestpile", {
	description = "Card pile that user has full access to. Works also like a minetest chest.",
	tiles = { "deck_back.png","deck_side.png" },
	palette = "deck_palette.png",
	groups = pilegroups,
	paramtype2 = "color",
	drawtype = "color",
	on_construct = function(pos)
	   pile_inv_setup(pos)
	   local meta=minetest.get_meta(pos)
	   meta:set_string("formspec", "size[13,11]"..
			      "list[context;main;0,0;13,4;]"..
			      "button[0,4;2,1;draw;Draw]"..
			      "button[2,4;2,1;drawall;Draw all]"..
			      "button[4,4;2,1;alltopile;Add all to pile]"..
			      "button[6,4;2,1;shuffle;Shuffle cards]"..
			      "button[8,4;2,1;tostock;Make stockpile]"..
			      "list[current_player;main;0,6;13,5;]")
	end,
	on_dig = on_dig_pile_getpile,
	stack_max = 1,
	after_place_node=after_place_pile,
	on_receive_fields = draw_card
})

minetest.register_node("deck:stockpile", {
	description = "Stock pile of cards. Can't be peeked.",
	groups = pilegroups,
	tiles = { "deck_back.png" },
	palette = "deck_palette.png",
	paramtype2 = "color",
	drawtype = "color",
	on_construct = function(pos)
	   pile_inv_setup(pos)
	   local meta=minetest.get_meta(pos)
	   meta:set_string("formspec","size[13,6]"..
			      "button[0,0;2,1;draw;Draw]"..
			      "button[2,0;2,1;drawall;Draw all]"..
			      "button[4,0;2,1;alltopile;Add all to pile]"..
			      "button[6,0;2,1;shuffle;Shuffle cards]"..
			      "list[current_player;main;0,1;13,5;]"
	   )
	end,
	on_dig = on_dig_pile_getpile,
	stack_max = 1,
	after_place_node=after_place_pile,
	on_receive_fields = draw_card
})

-- minetest.register_on_player_receive_fields(function(player, formname, fields)
--       minetest.log("xformname="..formname)
--       if fields.draw then
-- 	 minetest.chat_send_all("player "..player.name.."draw card")
--       end
-- end)

minetest.register_abm({
      label="Drop a card to deck",
      nodenames={"deck:chestpile","deck:stockpile"},
      neighbors=cardnames,
      interval=1.0,
      chance = 1,
      action=function(pos,node,active_object_count,active_object_count_wider)
	 local above = {x=pos.x,y=pos.y+1,z=pos.z}
	 local abovenode = minetest.get_node(above)
	 --minetest.log("abm1"..minetest.pos_to_string(pos).." "..node.name..
	 --""..abovenode.name)
	 if string.sub(abovenode.name,1,cardprefixlen) ~= cardprefix then
	    -- minetest.log("not card, but "..abovenode.name)
	    return end
	 local meta=minetest.get_meta(pos)
	 local inv=meta:get_inventory()
	 if pile_peek_first(inv) == nil then
	    lighten_pile(pos)
	 end
	 if pile_add_card_from_pos(inv,above) then
	    minetest.remove_node(above)
	    while true do
		above={x=above.x,y=above.y+1,z=above.z}
		abovenode = minetest.get_node(above)
		if string.sub(abovenode.name,1,cardprefixlen) == cardprefix then
		minetest.spawn_falling_node(above)
		else
		return
		end
	    end
	 end
      end
})

minetest.register_craft({
      output = "deck:stockpile",
      recipe = {{"group:card"}}
})
minetest.register_craft({
      output = "deck:chestpile",
      recipe = {{"group:card"}}
})
minetest.register_craft({
      output = "deck:chestpile",
      recipe = {{ "default:paper" },{ "default:paper" }}
})

local function craft_pile(itemstack,player,old_craft_grid,craft_inv,really)
      --describe("craft",old_craft_grid)
      -- local s=craft_inv:get_size("craft")
      local place, cardname
      local onlycards=true
      local onlypaper=true
      for key,value in pairs(old_craft_grid) do
	 --local stack=craft_inv:get_stack("craft",i)
	 local stack=old_craft_grid[key]
	 if stack:is_empty() then
	    --minetest.log("empty "..key)
	 else
	    place=key
	    cardname=stack:get_name()
	    if string.sub(cardname,1,10) ~= cardprefix then
	       onlycards=false
	    end
	    if cardname ~= "default:paper" then
	       onlypaper=false
	    end
	    minetest.log("craft:"..key.."="..stack:get_name())
	 end
      end
      if (onlycards==false and onlypaper==false) then
	 return nil
      end
      if onlypaper then
	 local resultname=itemstack:get_name()
	 if resultname == "deck:chestpile" then
	    local stackmeta=itemstack:get_meta()
	    local i
	    for i=1,52,1 do
	       stackmeta:set_string(i,cardnames[i])
	    end
	    return itemstack
	 end
	 return nil
      end
      local pilename
      if place < 5 then
	 pilename="deck:chestpile"
      else
	 pilename="deck:stockpile"
      end
      minetest.log("place="..place.." pilename="..pilename)
      local pilestack=ItemStack(pilename)
      local stackmeta=pilestack:get_meta()
      stackmeta:set_string(1,cardname)
      if really then
	 stackmeta:set_string("description",carddescriptions[cardname])
      end
      return pilestack
end

minetest.register_on_craft(function(itemstack,player,old_craft_grid,craft_inv)
      return craft_pile(itemstack,player,old_craft_grid,craft_inv,true)
end)
minetest.register_craft_predict(function(itemstack,player,old_craft_grid,craft_inv)
      return craft_pile(itemstack,player,old_craft_grid,craft_inv,false)
end)

minetest.register_on_joinplayer(function(player)
	--minetest.log(player:get_inventory_formspec())
	player:get_inventory():set_size("main", 60)
	player:set_inventory_formspec("size[13,11]list[current_player;main;0,3.5;13,5;]list[current_player;craft;3,0;3,3;]listring[]list[current_player;craftpreview;7,1;1,1;]")
	--minetest.log(player:get_inventory_formspec())
end)