-- Minetest Game mod: bucket
-- See README.txt for licensing and other information.

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

minetest.register_alias("bucket", "bucket:bucket_empty")
minetest.register_alias("bucket_water", "bucket:bucket_water")
minetest.register_alias("bucket_lava", "bucket:bucket_lava")

minetest.register_craft({
	output = "bucket:bucket_empty 1",
	recipe = {
		{ "minerals:ingot_iron", "", "minerals:ingot_iron" },
		{ "", "minerals:ingot_iron", "" },
	},
})

bucket = {}
bucket.liquids = {}

local function check_protection(pos, name, text)
	if minetest.is_protected(pos, name) then
		minetest.log(
			"action",
			(name ~= "" and name or "A mod")
				.. " tried to "
				.. text
				.. " at protected position "
				.. minetest.pos_to_string(pos)
				.. " with a bucket"
		)
		minetest.record_protection_violation(pos, name)
		return true
	end
	return false
end

local function log_action(pos, name, action)
	minetest.log(
		"action",
		(name ~= "" and name or "A mod") .. " " .. action .. " at " .. minetest.pos_to_string(pos) .. " with a bucket"
	)
end

-- Register a new liquid
--    source = name of the source node
--    flowing = name of the flowing node
--    itemname = name of the new bucket item (or nil if liquid is not takeable)
--    inventory_image = texture of the new bucket item (ignored if itemname == nil)
--    name = text description of the bucket item
--    groups = (optional) groups of the bucket item, for example {water_bucket = 1}
--    force_renew = (optional) bool. Force the liquid source to renew if it has a
--                  source neighbour, even if defined as 'liquid_renewable = false'.
--                  Needed to avoid creating holes in sloping rivers.
-- This function can be called from any mod (that depends on bucket).
function bucket.register_liquid(source, flowing, itemname, inventory_image, name, groups, force_renew)
	bucket.liquids[source] = {
		source = source,
		flowing = flowing,
		itemname = itemname,
		force_renew = force_renew,
	}
	bucket.liquids[flowing] = bucket.liquids[source]

	if itemname ~= nil then
		minetest.register_craftitem(itemname, {
			description = name,
			inventory_image = inventory_image,
			stack_max = 1,
			liquids_pointable = true,
			groups = groups,

			on_place = function(itemstack, user, pointed_thing)
				-- Must be pointing to node
				if pointed_thing.type ~= "node" then
					return
				end

				local node = minetest.get_node_or_nil(pointed_thing.under)
				local ndef = node and minetest.registered_nodes[node.name]

				-- Call on_rightclick if the pointed node defines it
				if
					ndef
					and ndef.on_rightclick
					and not (user and user:is_player() and user:get_player_control().sneak)
				then
					return ndef.on_rightclick(pointed_thing.under, node, user, itemstack)
				end

				local lpos

				-- Check if pointing to a buildable node
				if ndef and ndef.buildable_to then
					-- buildable; replace the node
					lpos = pointed_thing.under
				else
					-- not buildable to; place the liquid above
					-- check if the node above can be replaced

					lpos = pointed_thing.above
					node = minetest.get_node_or_nil(lpos)
					local above_ndef = node and minetest.registered_nodes[node.name]

					if not above_ndef or not above_ndef.buildable_to then
						-- do not remove the bucket with the liquid
						return itemstack
					end
				end

				local pname = user and user:get_player_name() or ""
				if check_protection(lpos, pname, "place " .. source) then
					return
				end

				minetest.set_node(lpos, { name = source })
				log_action(lpos, pname, "placed " .. source)
				return ItemStack("bucket:bucket_empty")
			end,
		})
	end
end

minetest.register_craftitem("bucket:bucket_empty", {
	description = S("Empty Bucket"),
	inventory_image = "bucket.png",
	groups = { tool = 1 },
	liquids_pointable = true,
	on_use = function(itemstack, user, pointed_thing)
		if pointed_thing.type == "object" then
			pointed_thing.ref:punch(user, 1.0, { full_punch_interval = 1.0 }, nil)
			return user:get_wielded_item()
		elseif pointed_thing.type ~= "node" then
			-- do nothing if it's neither object nor node
			return
		end
		-- Check if pointing to a liquid source
		local pos = pointed_thing.under
		local node = minetest.get_node(pos)
		local liquiddef = bucket.liquids[node.name]
		local item_count = user:get_wielded_item():get_count()

		if liquiddef ~= nil and liquiddef.itemname ~= nil and node.name == liquiddef.source then
			local pname = user:get_player_name()
			if check_protection(pos, pname, "take " .. node.name) then
				return
			end

			-- default set to return filled bucket
			local giving_back = liquiddef.itemname

			-- check if holding more than 1 empty bucket
			if item_count > 1 then
				-- if space in inventory add filled bucked, otherwise drop as item
				local inv = user:get_inventory()
				if inv:room_for_item("main", { name = liquiddef.itemname }) then
					inv:add_item("main", liquiddef.itemname)
				else
					local upos = user:get_pos()
					upos.y = math.floor(upos.y + 0.5)
					minetest.add_item(upos, liquiddef.itemname)
				end

				-- set to return empty buckets minus 1
				giving_back = "bucket:bucket_empty " .. tostring(item_count - 1)
			end

			-- force_renew requires a source neighbour
			local source_neighbor = false
			if liquiddef.force_renew then
				source_neighbor = minetest.find_node_near(pos, 1, liquiddef.source)
			end
			if source_neighbor and liquiddef.force_renew then
				log_action(pos, pname, "picked up " .. liquiddef.source .. " (force renewed)")
			else
				minetest.add_node(pos, { name = "air" })
				log_action(pos, pname, "picked up " .. liquiddef.source)
			end

			return ItemStack(giving_back)
		else
			-- non-liquid nodes will have their on_punch triggered
			local node_def = minetest.registered_nodes[node.name]
			if node_def then
				node_def.on_punch(pos, node, user, pointed_thing)
			end
			return user:get_wielded_item()
		end
	end,
})

bucket.register_liquid(
	"default:water_source",
	"default:water_flowing",
	"bucket:bucket_water",
	"bucket_water.png",
	S("Water Bucket"),
	{ tool = 1, water_bucket = 1 }
)

bucket.register_liquid(
	"default:lava_source",
	"default:lava_flowing",
	"bucket:bucket_lava",
	"bucket_lava.png",
	S("Lava Bucket"),
	{ tool = 1 }
)

minetest.register_craftitem("bucket:bucket_milk", {
	description = S("Milk bucket"),
	inventory_image = "bucket_milk.png",
	stack_max = 1,
	groups = { tool = 1 },
})

minetest.register_craft({
	type = "fuel",
	recipe = "bucket:bucket_lava",
	burntime = 60,
	replacements = { { "bucket:bucket_lava", "bucket:bucket_empty" } },
})
