-- 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


--
-- Global callbacks
--


-- Global environment step function
function on_step(dtime)
	-- print("on_step")
end
minetest.register_globalstep(on_step)


function on_placenode(p, node)
	--print("on_placenode")
end
minetest.register_on_placenode(on_placenode)


function on_dignode(p, node)
	--print("on_dignode")
end
minetest.register_on_dignode(on_dignode)


function on_punchnode(p, node)
end
minetest.register_on_punchnode(on_punchnode)




--
-- Grow trees
--


minetest.register_abm({
	nodenames = {"default:sapling"},
	interval = 20,
	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 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({
	nodenames = {"default:junglesapling"},
	interval = 20,
	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)
            if minetest.find_node_near(pos, 5, {"default:water_flowing"}) == nil then
               minetest.set_node(pos, {name="default:tuff"})
            else
               minetest.set_node(pos, {name="default:water_source"})
	end
end


default.cool_lava_flowing = function(pos)
	         minetest.set_node(pos, {name="default:gravel_volcanic"})
end


minetest.register_abm({
	nodenames = {"default:lava_flowing"},
	neighbors = {"group:water"},
	interval = 1,
	chance = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		default.cool_lava_flowing(pos, node, active_object_count, active_object_count_wider)
	end,
})


minetest.register_abm({
	nodenames = {"default:lava_source"},
	neighbors = {"group:water"},
	interval = 1,
	chance = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		default.cool_lava_source(pos, node, active_object_count, active_object_count_wider)
	end,
})

--
-- Stonetransformation
--

minetest.register_abm({
	nodenames = {"default:stone"},
    neighbors = {"group:lava"},
	interval = 25,
	chance = 15,
	action = function(pos, node)
		minetest.set_node(pos, {name="default:desert_stone"})
	end,
})

minetest.register_abm({
	nodenames = {"default:stone"},
	interval = 600,
	chance = 65,
	action = function(pos, node)
		if minetest.find_node_near(pos, 2, {"group:water"}) == nil then
			return
		else
			minetest.set_node(pos, {name="default:mossystone"})
		end
	end,
})

--
-- Tufftransformation
--

minetest.register_abm({
	nodenames = {"default:tuff"},
    neighbors = {"group:lava"},
	interval = 25,
	chance = 15,
	action = function(pos, node)
		minetest.set_node(pos, {name="default:tuff_baked"})
	end,
})

minetest.register_abm({
	nodenames = {"default:tuff"},
	interval = 600,
	chance = 65,
	action = function(pos, node)
		if minetest.find_node_near(pos, 2, {"group:water"}) == nil then
			return
		else
			minetest.set_node(pos, {name="default:mossytuff"})
		end
	end,
})

--
-- Marble
--

minetest.register_abm({
	nodenames = {"default:chondrit"},
	neighbors = {"group:water"},
	interval = 200,
	chance = 55,
	action = function(pos, node)
		if minetest.find_node_near(pos, 4, {"group:lava"}) == nil or pos.y > -500 then
			return
		else
			minetest.set_node(pos, {name="default:marble"})
		end
	end,
})


--
-- Obsidian
--

minetest.register_abm({
	nodenames = {"default:gravel_volcanic"},
	neighbors = {"group:lava"},
	interval = 1111,
	chance = 65,
	action = function(pos, node)
		if minetest.find_node_near(pos, 4, {"group:water"}) == nil or pos.y > -1000 then
			return
		else
			minetest.set_node(pos, {name="default:obsidian"})
		end
	end,
})

--
-- Cobbletransformation
--
minetest.register_abm({
	nodenames = {"default:cobble"},
    neighbors = {"group:water"},
	interval = 500,
	chance = 35,
	action = function(pos, node)
		minetest.set_node(pos, {name="default:mossycobble"})
	end,
})

minetest.register_abm({
	nodenames = {"default:cobble"},
	interval = 500,
	chance = 55,
	action = function(pos, node)
		if minetest.find_node_near(pos, 2, {"group:water"}) == nil then
			return
		else
			minetest.set_node(pos, {name="default:mossycobble"})
		end
	end,
})

minetest.register_abm({
	nodenames = {"default:mossycobble"},
    neighbors = {"default:water_flowing"},
	interval = 500,
	chance = 75,
	action = function(pos, node)
		minetest.set_node(pos, {name="default:gravel"})
	end,
})


--
-- Ash_leavetransformation
--

minetest.register_abm({
	nodenames = {"default:sand"},
	interval = 550,
	chance = 35,
	action = function(pos, node)
		if minetest.find_node_near(pos, 3, {"group:leaves"}) == nil then
			return
		else
		    pos.y = pos.y+1
			if minetest.get_node(pos).name == "default:cactus" then
			  return
			else
			pos.y = pos.y-1
			minetest.set_node(pos, {name="default:desert_sand"})
			end
		end
	end,
})


--
-- Sandtransformation
--

minetest.register_abm({
	nodenames = {"default:desert_sand"},
    neighbors = {"group:water"},
	interval = 25,
	chance = 5,
	action = function(pos, node)
		   minetest.set_node(pos, {name="default:dirt"})
	end,
})

minetest.register_abm({
	nodenames = {"default:desert_sand"},
    neighbors = {"default:dirt", "default:dirt_with_grass"},
	interval = 50,
	chance = 5,
	action = function(pos, node)
			if minetest.find_node_near(pos, 10, {"group:water"}) == nil then
				return
			else
			    minetest.set_node(pos, {name="default:dirt"})
			end
	end,
})

minetest.register_abm({
	nodenames = {"default:sand"},
    neighbors = {"group:water"},
	interval = 700,
	chance = 75,
	action = function(pos, node)
              minetest.set_node(pos, {name="default:clay"})				
	end,
})


-- Dirttransformation
--

minetest.register_abm({
	nodenames = {"default:dirt"},
	interval = 50,
	chance = 20,
	action = function(pos, node)
		local name = minetest.get_node(pos).name
			    pos.y = pos.y+1
				if minetest.get_node(pos).name == "air" then
				   if minetest.get_node_light(pos) < 8 then
				      return
				   else
				    pos.y = pos.y-1
					minetest.set_node(pos, {name="default:dirt_with_grass"})
				   end
				end
	end,
})

-- minetest.register_abm({
	-- nodenames = {"default:dirt"},
	-- interval = 50,
	-- chance = 20,
	-- action = function(pos, node)
			-- if minetest.find_node_near(pos, 10, {"group:water"}) == nil then
               -- minetest.set_node(pos, {name="default:desert_sand"})				
            -- else
               -- return 
			-- end
	-- end,
-- })

-- minetest.register_abm({
	-- nodenames = {"default:dirt_with_grass"},
	-- interval = 50,
	-- chance = 20,
	-- action = function(pos, node)
			-- if minetest.find_node_near(pos, 10, {"group:water"}) == nil then
               -- minetest.set_node(pos, {name="default:dirt"})				
            -- else
               -- return 
			-- end
	-- end,
-- })
-- sugarcane
minetest.register_abm({
	nodenames = {"default:sugarcane"},
	neighbors = {"default:dirt", "default:dirt_with_grass"},
	interval = 55,
	chance = 35,
	action = function(pos, node)
		pos.y = pos.y-1
		local name = minetest.get_node(pos).name
		if name == "default:dirt" or name == "default:dirt_with_grass" then
			pos.y = pos.y+1
			local height = 0
			while minetest.get_node(pos).name == "default:sugarcane" and height < 3 do
				height = height+1
				pos.y = pos.y+1
			end
			if height < 3 then
				if minetest.get_node(pos).name == "air" then
					minetest.set_node(pos, {name="default:sugarcane"})
				end
			end
		end
	end,
})

minetest.register_abm({
	nodenames = {"default:dirt_with_grass"},
    neighbors = {"default:papyrus"},
	interval = 500,
	chance = 25,
	action = function(pos, node)
              if minetest.find_node_near(pos, 10, {"default:sugarcane"}) == nil then
			     pos.y = pos.y+1
				 if minetest.get_node(pos).name == "air" then
			        minetest.set_node(pos, {name="default:sugarcane"})
				 end
			else
			    return
			end				
	end,
})
--
-- Papyrus and cactus growing
--


minetest.register_abm({
	nodenames = {"default:cactus"},
	neighbors = {"group:sand"},
	interval = 50,
	chance = 20,
	action = function(pos, node)
		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 < 3 then
				if minetest.get_node(pos).name == "air" then
					minetest.set_node(pos, {name="default:cactus"})
				end
			end
		end
	end,
})


minetest.register_abm({
	nodenames = {"default:papyrus"},
	neighbors = {"default:dirt", "default:dirt_with_grass"},
	interval = 50,
	chance = 20,
	action = function(pos, node)
		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,
})


--
-- dig upwards
--

function default.dig_up(pos, node, digger)
	if digger == nil then return end
	local np = {x = pos.x, y = pos.y + 1, z = pos.z}
	local nn = minetest.get_node(np)
	if nn.name == node.name then
		minetest.node_dig(np, nn, digger)
	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


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


minetest.register_abm({
	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, _, _)
		--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
			itemstacks = minetest.get_node_drops(n0.name)
			for _, itemname in ipairs(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)
			nodeupdate(p0)
		end
	end
})