-- Minetest 0.4 mod: bones
-- See README.txt for licensing and other information. 

-- Load support for MT game translation.
local S = minetest.get_translator("bones")

bones = {}
local share_bones_time = tonumber(minetest.settings:get("share_bones_time") or 1200)

local function is_owner(pos, name)
	local owner = minetest.get_meta(pos):get_string("owner")
	if owner == "" or owner == name then
		return true
	end
	return false
end

minetest.register_node("bones:bones", {
	description = S("Bones"),
	_tt_help = S("Contains dead player's items"),
	tiles = {
		"bones_top.png",
		"bones_bottom.png",
		"bones_side.png",
		"bones_side.png",
		"bones_rear.png",
		"bones_front.png"
	},
	paramtype2 = "facedir",
	groups = {crumbly=3},
	drop = "",
	sounds = default.node_sound_dirt_defaults({
		footstep = {name="default_gravel_footstep", gain=0.45},
	}),
	can_dig = function(pos, player)
		local inv = minetest.get_meta(pos):get_inventory()
		return (is_owner(pos, player:get_player_name()) and inv:is_empty("main")) or inv:is_empty("main")
	end,
	allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		if is_owner(pos, player:get_player_name()) then
			return count
		end
		return 0
	end,
	allow_metadata_inventory_put = function(pos, listname, index, stack, player)
		return 0
	end,
	allow_metadata_inventory_take = function(pos, listname, index, stack, player)
		if is_owner(pos, player:get_player_name()) then
			return stack:get_count()
		end
		return 0
	end,
	on_metadata_inventory_take = function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		if meta:get_string("owner") ~= "" and meta:get_inventory():is_empty("main") then
			meta:set_string("infotext", S("@1's old bones", meta:get_string("owner")))
			meta:set_string("formspec", "")
			meta:set_string("owner", "")
		end
	end,
	on_punch = function(pos, node, player)
		local owner = minetest.get_meta(pos):get_string("owner")
		local infotext = minetest.get_meta(pos):get_string("infotext")
		local name = player:get_player_name()
		if infotext == "" then return end
		if owner ~= "" and owner ~= name  then
			return
		end

		local inv = minetest.get_meta(pos):get_inventory()
		local player_inv = player:get_inventory()
		local has_space = true

		for i=1,inv:get_size("main") do
			local stk = inv:get_stack("main", i)
			if player_inv:room_for_item("main", stk) then
				inv:set_stack("main", i, nil)
				player_inv:add_item("main", stk)
			else
				has_space = false
				break
			end
		end

		-- Remove bones if player emptied them
		if has_space then
			minetest.remove_node(pos)
		end
	end,
	on_timer = function(pos, elapsed)
		local meta = minetest.get_meta(pos)
		local time = meta:get_int("time") + elapsed
		if time >= share_bones_time then
			meta:set_string("infotext", S("@1's old bones", meta:get_string("owner")))
			meta:set_string("owner", "")
		else
			meta:set_int("time", time)
			return true
		end
	end,
})

local function may_replace(pos, player)
	local node_name = minetest.get_node(pos).name
	local node_definition = minetest.registered_nodes[node_name]

	-- if the node is unknown, we let the protection mod decide
	-- this is consistent with when a player could dig or not dig it
	-- unknown decoration would often be removed
	-- while unknown building materials in use would usually be left
	if not node_definition then
		-- only replace nodes that are not protected
		return not minetest.is_protected(pos, player:get_player_name())
	end

	-- allow replacing air and liquids
	if node_name == "air" or node_definition.liquidtype ~= "none" then
		return true
	end

	-- don't replace filled chests and other nodes that don't allow it
	local can_dig_func = node_definition.can_dig
	if can_dig_func and not can_dig_func(pos, player) then
		return false
	end

	-- default to each nodes buildable_to; if a placed block would replace it, why shouldn't bones?
	-- flowers being squished by bones are more realistical than a squished stone, too
	-- exception are of course any protected buildable_to
	return node_definition.buildable_to and not minetest.is_protected(pos, player:get_player_name())
end

function bones.place_bones(player)
	local pos = player:get_pos()
	pos.x = math.floor(pos.x+0.5)
	pos.y = math.floor(pos.y+0.5)
	pos.z = math.floor(pos.z+0.5)
	local param2 = minetest.dir_to_facedir(player:get_look_dir())
	local player_name = player:get_player_name()
	local player_inv = player:get_inventory()

	-- don't place empty bones
	if player_inv:is_empty("main") and player_inv:is_empty("craft") then return end

	if (not may_replace(pos, player)) then
		if (may_replace({x=pos.x, y=pos.y+1, z=pos.z}, player)) then
			-- drop one node above if there's space
			-- this should solve most cases of protection related deaths in which players dig straight down
			-- yet keeps the bones reachable
			pos.y = pos.y+1
		else
			local near = minetest.find_node_near(pos, 5, {"air", "group:liquid"})
			if near then
				pos = {x = near.x, y = near.y, z = near.z}
			else
				-- drop items instead of delete
				for i=1,player_inv:get_size("main") do
					minetest.add_item(pos, player_inv:get_stack("main", i))
				end
				for i=1,player_inv:get_size("craft") do
					minetest.add_item(pos, player_inv:get_stack("craft", i))
				end
				-- empty lists main and craft
				player_inv:set_list("main", {})
				player_inv:set_list("craft", {})
				return
			end
		end
	end

	minetest.set_node(pos, {name="bones:bones", param2=param2})

	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	inv:set_size("main", 8*4)

	local empty_list = inv:get_list("main")
	inv:set_list("main", player_inv:get_list("main"))
	player_inv:set_list("main", empty_list)

	for i=1,player_inv:get_size("craft") do
		inv:add_item("main", player_inv:get_stack("craft", i))
		player_inv:set_stack("craft", i, nil)
	end

	meta:set_string("formspec", "size[8,9;]"..
			"list[current_name;main;0,0;8,4;]"..
			"list[current_player;main;0,5;8,4;]")
	meta:set_string("owner", player_name)

	if share_bones_time ~= 0 then
		meta:set_string("infotext", S("@1's fresh bones", player_name))
		meta:set_int("time", 0)
		minetest.get_node_timer(pos):start(10)
	else
		meta:set_string("infotext", S("@1's bones", player_name))
	end
end

minetest.register_on_dieplayer(function(player)
	if minetest.is_creative_enabled(player) or
		minetest.settings:get_bool("disable_bones") then
		return
	end
	bones.place_bones(player)
end)

minetest.register_craft({
	type = "shapeless",
	output = 'default:bone 9',
	recipe = {'bones:bones'},
})

minetest.register_craft({
	output = 'bones:bones',
	recipe = {
		{'default:bone', 'default:bone', 'default:bone'},
		{'default:bone', 'default:bone', 'default:bone'},
		{'default:bone', 'default:bone', 'default:bone'},
	}
})
