-- mods/default/functions.lua

--
-- Sounds
--

function default.node_sound_defaults(table)
	table = table or {}
	table.footstep = table.footstep or
			{name="", gain=1.0}
	table.dug = table.dug or
			{name="default_dug_node", gain=0.25}
	table.place = table.place or
			{name="default_place_node_hard", gain=1.0}
	return table
end

function default.node_sound_stone_defaults(table)
	table = table or {}
	table.footstep = table.footstep or
			{name="default_hard_footstep", gain=0.5}
	table.dug = table.dug or
			{name="default_hard_footstep", gain=1.0}
	default.node_sound_defaults(table)
	return table
end

function default.node_sound_dirt_defaults(table)
	table = table or {}
	table.footstep = table.footstep or
			{name="default_dirt_footstep", gain=1.0}
	table.dug = table.dug or
			{name="default_dirt_footstep", gain=1.5}
	table.place = table.place or
			{name="default_place_node", gain=1.0}
	default.node_sound_defaults(table)
	return table
end

function default.node_sound_sand_defaults(table)
	table = table or {}
	table.footstep = table.footstep or
			{name="default_sand_footstep", gain=0.5}
	table.dug = table.dug or
			{name="default_sand_footstep", gain=1.0}
	table.place = table.place or
			{name="default_place_node", gain=1.0}
	default.node_sound_defaults(table)
	return table
end

function default.node_sound_wood_defaults(table)
	table = table or {}
	table.footstep = table.footstep or
			{name="default_wood_footstep", gain=0.5}
	table.dug = table.dug or
			{name="default_wood_footstep", gain=1.0}
	default.node_sound_defaults(table)
	return table
end

function default.node_sound_leaves_defaults(table)
	table = table or {}
	table.footstep = table.footstep or
			{name="default_grass_footstep", gain=0.35}
	table.dug = table.dug or
			{name="default_grass_footstep", gain=0.85}
	table.dig = table.dig or
			{name="default_dig_crumbly", gain=0.4}
	table.place = table.place or
			{name="default_place_node", gain=1.0}
	default.node_sound_defaults(table)
	return table
end

function default.node_sound_glass_defaults(table)
	table = table or {}
	table.footstep = table.footstep or
			{name="default_glass_footstep", gain=0.5}
	table.dug = table.dug or
			{name="default_break_glass", gain=1.0}
	default.node_sound_defaults(table)
	return table
end

--
-- Legacy
--

function default.spawn_falling_node(p, nodename)
	spawn_falling_node(p, nodename)
end

-- Horrible crap to support old code
-- Don't use this and never do what this does, it's completely wrong!
-- (More specifically, the client and the C++ code doesn't get the group)
function default.register_falling_node(nodename, texture)
	minetest.log("error", debug.traceback())
	minetest.log('error', "WARNING: default.register_falling_node is deprecated")
	if minetest.registered_nodes[nodename] then
		minetest.registered_nodes[nodename].groups.falling_node = 1
	end
end

minetest.register_abm({
	label = "grow sapling",
	nodenames = {"default:sapling"},
	interval = 10,
	chance = 50,
	action = function(pos, node)
		--if abm_limiter() then return end
		local nu =  minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name
		local is_soil = minetest.get_item_group(nu, "soil")
		if is_soil == 0 then
			return
		end
		
		minetest.log("action", "A sapling grows into a tree at "..minetest.pos_to_string(pos))
		local vm = minetest.get_voxel_manip()
		local minp, maxp = vm:read_from_map({x=pos.x-16, y=pos.y, z=pos.z-16}, {x=pos.x+16, y=pos.y+16, z=pos.z+16})
		local a = VoxelArea:new{MinEdge=minp, MaxEdge=maxp}
		local data = vm:get_data()
		default.grow_tree(data, a, pos, math.random(1, 4) == 1, math.random(1,100000))
		vm:set_data(data)
		vm:write_to_map(data)
		vm:update_map()
	end
})

minetest.register_abm({
	label = "grow jungle sapling",
	nodenames = {"default:junglesapling"},
	interval = 10,
	chance = 50,
	action = function(pos, node)
		local nu =  minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name
		local is_soil = minetest.get_item_group(nu, "soil")
		if is_soil == 0 then
			return
		end
		
		minetest.log("action", "A jungle sapling grows into a tree at "..minetest.pos_to_string(pos))
		local vm = minetest.get_voxel_manip()
		local minp, maxp = vm:read_from_map({x=pos.x-16, y=pos.y-1, z=pos.z-16}, {x=pos.x+16, y=pos.y+16, z=pos.z+16})
		local a = VoxelArea:new{MinEdge=minp, MaxEdge=maxp}
		local data = vm:get_data()
		default.grow_jungletree(data, a, pos, math.random(1,100000))
		vm:set_data(data)
		vm:write_to_map(data)
		vm:update_map()
	end
})

--
-- Lavacooling
--

default.cool_lava_source = function(pos)
	minetest.set_node(pos, {name="default:obsidian"})
	minetest.sound_play("default_cool_lava", {pos = pos,  gain = 0.25})
end

default.cool_lava_flowing = function(pos)
	minetest.set_node(pos, {name="default:stone"})
	minetest.sound_play("default_cool_lava", {pos = pos,  gain = 0.25})
end

minetest.register_abm({
	label = "cool lava flow",
	nodenames = {"default:lava_flowing"},
	neighbors = {"group:water"},
	interval = 1,
	chance = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		--if abm_limiter() then return end
		default.cool_lava_flowing(pos, node, active_object_count, active_object_count_wider)
	end,
})

minetest.register_abm({
	label = "cool lava source",
	nodenames = {"default:lava_source"},
	neighbors = {"group:water"},
	interval = 1,
	chance = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		--if abm_limiter() then return end
		default.cool_lava_source(pos, node, active_object_count, active_object_count_wider)
	end,
})

-- freeze things
minetest.register_abm({
	label = "freeze things",
	nodenames = {"group:freezes"},
	neighbors = {"group:cold"},
	interval = 10,
	chance = 4,
	action = function(pos, node)
		pos.y = pos.y + 1
		if minetest.get_node(pos).name == "air" then
			pos.y = pos.y - 1
			local new_node = minetest.registered_nodes[node.name].freezemelt
			if new_node ~= nil then
				minetest.set_node(pos,{name=new_node})
			else
				minetest.log("error","Freezing node without freezemelt set: "..node.name)
			end
		end
	end
})

-- melt things
minetest.register_abm({
	label = "melt things",
	nodenames = {"group:melts"},
	neighbors = {"group:hot"},
	interval = 10,
	chance = 4,
	action = function(pos, node)
	local new_node = minetest.registered_nodes[node.name].freezemelt
		if new_node ~= nil then
			minetest.set_node(pos,{name=new_node})
		else
			minetest.log("error","Thawing node without freezemelt set: "..node.name)
		end	
	end
})

--
-- Papyrus and cactus growing
--

minetest.register_abm({
	label = "grow cactus",
	nodenames = {"default:cactus"},
	neighbors = {"group:sand"},
	interval = 50,
	chance = 20,
	action = function(pos, node)
		--if abm_limiter() then return end
		pos.y = pos.y-1
		local name = minetest.get_node(pos).name
		if minetest.get_item_group(name, "sand") ~= 0 then
			pos.y = pos.y+1
			local height = 0
			while minetest.get_node(pos).name == "default:cactus" and height < 4 do
				height = height+1
				pos.y = pos.y+1
			end
			if height < 4 then
				if minetest.get_node(pos).name == "air" then
					minetest.set_node(pos, {name="default:cactus"})
				end
			end
		end
	end,
})

minetest.register_abm({
	label = "grow papyrus",
	nodenames = {"default:papyrus"},
	neighbors = {"default:dirt", "default:dirt_with_grass"},
	interval = 50,
	chance = 20,
	action = function(pos, node)
		--if abm_limiter() then return end
		pos.y = pos.y-1
		local name = minetest.get_node(pos).name
		if name == "default:dirt" or name == "default:dirt_with_grass" then
			if minetest.find_node_near(pos, 3, {"group:water"}) == nil then
				return
			end
			pos.y = pos.y+1
			local height = 0
			while minetest.get_node(pos).name == "default:papyrus" and height < 4 do
				height = height+1
				pos.y = pos.y+1
			end
			if height < 4 then
				if minetest.get_node(pos).name == "air" then
					minetest.set_node(pos, {name="default:papyrus"})
				end
			end
		end
	end,
})

--
-- Leafdecay
--

-- To enable leaf decay for a node, add it to the "leafdecay" group.
--
-- The rating of the group determines how far from a node in the group "tree"
-- the node can be without decaying.
--
-- If param2 of the node is ~= 0, the node will always be preserved. Thus, if
-- the player places a node of that kind, you will want to set param2=1 or so.
--
-- If the node is in the leafdecay_drop group then the it will always be dropped
-- as an item

default.leafdecay_trunk_cache = {}
default.leafdecay_enable_cache = true
-- Spread the load of finding trunks
default.leafdecay_trunk_find_allow_accumulator = 0

function default.leaf_globalstep(dtime)
	local finds_per_second = 5000
	default.leafdecay_trunk_find_allow_accumulator =
			math.floor(dtime * finds_per_second)
end

minetest.register_abm({
	label = "leaf decay",
	nodenames = {"group:leafdecay"},
	neighbors = {"air", "group:liquid"},
	-- A low interval and a high inverse chance spreads the load
	interval = 2,
	chance = 5,

	action = function(p0, node, _, _)
		----if abm_limiter() then return end
		--print("leafdecay ABM at "..p0.x..", "..p0.y..", "..p0.z..")")
		local do_preserve = false
		local d = minetest.registered_nodes[node.name].groups.leafdecay
		if not d or d == 0 then
			--print("not groups.leafdecay")
			return
		end
		local n0 = minetest.get_node(p0)
		if n0.param2 ~= 0 then
			--print("param2 ~= 0")
			return
		end
		local p0_hash = nil
		if default.leafdecay_enable_cache then
			p0_hash = minetest.hash_node_position(p0)
			local trunkp = default.leafdecay_trunk_cache[p0_hash]
			if trunkp then
				local n = minetest.get_node(trunkp)
				local reg = minetest.registered_nodes[n.name]
				-- Assume ignore is a trunk, to make the thing work at the border of the active area
				if n.name == "ignore" or (reg and reg.groups.tree and reg.groups.tree ~= 0) then
					--print("cached trunk still exists")
					return
				end
				--print("cached trunk is invalid")
				-- Cache is invalid
				table.remove(default.leafdecay_trunk_cache, p0_hash)
			end
		end
		if default.leafdecay_trunk_find_allow_accumulator <= 0 then
			return
		end
		default.leafdecay_trunk_find_allow_accumulator =
				default.leafdecay_trunk_find_allow_accumulator - 1
		-- Assume ignore is a trunk, to make the thing work at the border of the active area
		local p1 = minetest.find_node_near(p0, d, {"ignore", "group:tree"})
		if p1 then
			do_preserve = true
			if default.leafdecay_enable_cache then
				--print("caching trunk")
				-- Cache the trunk
				default.leafdecay_trunk_cache[p0_hash] = p1
			end
		end
		if not do_preserve then
			-- Drop stuff other than the node itself
			local itemstacks = minetest.get_node_drops(n0.name)
			for _, itemname in pairs(itemstacks) do
				if minetest.get_item_group(n0.name, "leafdecay_drop") ~= 0 or
						itemname ~= n0.name then
					local p_drop = {
						x = p0.x - 0.5 + math.random(),
						y = p0.y - 0.5 + math.random(),
						z = p0.z - 0.5 + math.random(),
					}
					minetest.add_item(p_drop, itemname)
				end
			end
			-- Remove node
			minetest.remove_node(p0)
			if adventuretest.is_50 then
				minetest.check_for_falling(p0)
			else
				nodeupdate(p0)
			end
		end
	end
})

function default.serialize_to_file(filename,t)
	local f = io.open(filename, "w")
	if f ~= nil then
		f:write(minetest.serialize(t))
		f:close()
	else
		minetest.log("error","Unable to open for writing "..tostring(filename))
	end
end

function default.deserialize_from_file(filename)
	local f = io.open(filename, "r")
		if f==nil then 
			--minetest.log("error","File "..filename.." not found, returning empty table")
			return {}
		end
			local t = f:read("*all")
			f:close()
		if t=="" or t==nil then 
			--minetest.log("error","File "..filename.." is blank, returning empty table")
			return {}
		end
		return minetest.deserialize(t)
end

function default.dump_inv(pos,listname,inv)	
	if inv == nil then
		local meta = minetest.get_meta(pos)
		inv = meta:get_inventory()
	end
	if inv:get_list(listname) ~= nil then
		for i,stack in pairs(inv:get_list(listname)) do
			default.drop_item(pos,stack)
			stack:clear()
			inv:set_stack(listname, i, stack)
		end
	end	
end

function default.drop_item(pos,itemstack,vel,acc)
--	math.randomseed(os.time() + os.clock())
	local x = math.random(0, 15)/10 - 0.5
	local z = math.random(0, 15)/10 - 0.5
	--local y = math.random(0, 15)/10 - 2
	local np = { }
	np.x = pos.x + x
	np.z = pos.z + z
	np.y = pos.y + .25
	local obj = minetest.add_item(np, itemstack)
	if obj then
		obj:get_luaentity().collect = true
		if vel ~= nil and acc ~= nil then
			obj:get_luaentity().object:setvelocity(vel)
			obj:get_luaentity().object:setacceleration(acc)
		end
	end
end

function default.get_distance(pos1,pos2)
	if ( pos1 ~= nil and pos2 ~= nil ) then
		return math.abs(math.floor(math.sqrt( (pos1.x - pos2.x)^2 + (pos1.z - pos2.z)^2 )))
	else
		return nil
	end
end

function default.get_file_contents(filename)
	local f = io.open(filename, "r")
		if f==nil then 
			minetest.log("error","File "..filename.." not found, returning empty table")
			return ""
		end
			local t = f:read("*all")
			f:close()
		if t=="" or t==nil then 
			minetest.log("error","File "..filename.." is blank, returning empty table")
			return ""
		end
		return t
end

function randomChance (percent) 
	--math.randomseed( os.clock() )
	return percent >= ( math.random(1000, 100000) / 1000 )
end

function default.tprint (tbl, indent)
  if not indent then indent = 0 end
  for k, v in pairs(tbl) do
    local formatting = string.rep("  ", indent) .. k .. ": "
    if type(v) == "table" then
      print(formatting)
      default.tprint(v, indent+1)
    elseif type(v) == 'boolean' then
      print(formatting .. tostring(v))      
    else
      print(formatting .. v)
    end
  end
end