local chest = minetest.get_content_id("mcl_chests:chest")

local mcl_hoppers_formspec =
	"size[9,7]"..
	"background[-0.19,-0.25;9.41,10.48;mcl_hoppers_inventory.png]"..
	mcl_vars.inventory_header..
	"list[current_name;main;2,0.5;5,1;]"..
	"list[current_player;main;0,2.5;9,3;9]"..
	"list[current_player;main;0,5.74;9,1;]"..
	"listring[current_name;main]"..
	"listring[current_player;main]"

minetest.register_node("mcl_hoppers:hopper", {
	description = "Hopper",
	inventory_image = "mcl_hoppers_item.png",
	wield_image = "mcl_hoppers_item.png",
	groups = {pickaxey=1, container=2,deco_block=1,},
	drawtype = "nodebox",
	paramtype = "light",
	tiles = {"mcl_hoppers_hopper_inside.png^mcl_hoppers_hopper_top.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_inside.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_outside.png"},
	selection_box = {type="regular"},
	node_box = {
			type = "fixed",
			fixed = {
			--funnel walls
			{-0.5, 0.0, 0.4, 0.5, 0.5, 0.5},
			{0.4, 0.0, -0.5, 0.5, 0.5, 0.5},
			{-0.5, 0.0, -0.5, -0.4, 0.5, 0.5},
			{-0.5, 0.0, -0.5, 0.5, 0.5, -0.4},
			--funnel base
			{-0.5, 0.0, -0.5, 0.5, 0.1, 0.5},
			--spout
			{-0.3, -0.3, -0.3, 0.3, 0.0, 0.3},
			{-0.15, -0.3, -0.15, 0.15, -0.5, 0.15},
			},
		},

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", mcl_hoppers_formspec)
		local inv = meta:get_inventory()
		inv:set_size("main", 5)
	end,

	on_place = function(itemstack, placer, pointed_thing)
		local upos  = pointed_thing.under
		local apos = pointed_thing.above

		local uposnode = minetest.get_node(upos)
		local uposnodedef = minetest.registered_nodes[uposnode.name]

		-- Use pointed node's on_rightclick function first, if present
		if placer and not placer:get_player_control().sneak then
			if uposnodedef and uposnodedef.on_rightclick then
				return uposnodedef.on_rightclick(pointed_thing.under, uposnode, placer, itemstack) or itemstack
			end
		end

		local bpos
		if uposnodedef.buildable_to then
			bpos = upos
		else
			local aposnodedef = minetest.registered_nodes[minetest.get_node(apos).name]
			if aposnodedef.buildable_to then
				bpos = apos
			end
		end

		if bpos == nil then
			return itemstack
		end

		local x = upos.x - apos.x
		local y = upos.y - apos.y
		local z = upos.z - apos.z

		if x == -1 then
			minetest.set_node(bpos, {name="mcl_hoppers:hopper_side", param2=0})
		elseif x == 1 then
			minetest.set_node(bpos, {name="mcl_hoppers:hopper_side", param2=2})
		elseif z == -1 then
			minetest.set_node(bpos, {name="mcl_hoppers:hopper_side", param2=3})
		elseif z == 1 then
			minetest.set_node(bpos, {name="mcl_hoppers:hopper_side", param2=1})
		else
			minetest.set_node(bpos, {name="mcl_hoppers:hopper", param2=0})
		end
		if not minetest.setting_getbool("creative_mode") then
			itemstack:take_item()
		end
		return itemstack
	end,

	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for i=1,inv:get_size("main") do
			local stack = inv:get_stack("main", i)
			if not stack:is_empty() then
				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,
	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		minetest.log("action", player:get_player_name()..
				" moves stuff in mcl_hoppers at "..minetest.pos_to_string(pos))
	end,
    on_metadata_inventory_put = function(pos, listname, index, stack, player)
		minetest.log("action", player:get_player_name()..
				" moves stuff to mcl_hoppers at "..minetest.pos_to_string(pos))
	end,
    on_metadata_inventory_take = function(pos, listname, index, stack, player)
		minetest.log("action", player:get_player_name()..
				" takes stuff from mcl_hoppers at "..minetest.pos_to_string(pos))
	end,
	sounds = mcl_sounds.node_sound_metal_defaults(),
	_mcl_blast_resistance = 24,
	_mcl_hardness = 3,
})

minetest.register_node("mcl_hoppers:hopper_side", {
	description = "Hopper (Side)",
	_doc_items_create_entry = false,
	drop = "mcl_hoppers:hopper",
	groups = {pickaxey=1, container=2,not_in_creative_inventory=1},
	drawtype = "nodebox",
	paramtype = "light",
	paramtype2 = "facedir",
	tiles = {"mcl_hoppers_hopper_inside.png^mcl_hoppers_hopper_top.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_inside.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_outside.png"},
	selection_box = {type="regular"},
	node_box = {
			type = "fixed",
			fixed = {
			--funnel walls
			{-0.5, 0.0, 0.4, 0.5, 0.5, 0.5},
			{0.4, 0.0, -0.5, 0.5, 0.5, 0.5},
			{-0.5, 0.0, -0.5, -0.4, 0.5, 0.5},
			{-0.5, 0.0, -0.5, 0.5, 0.5, -0.4},
			--funnel base
			{-0.5, 0.0, -0.5, 0.5, 0.1, 0.5},
			--spout
			{-0.3, -0.3, -0.3, 0.3, 0.0, 0.3},
			{-0.7, -0.3, -0.15, 0.15, 0.0, 0.15},
			},
		},

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", mcl_hoppers_formspec)
		local inv = meta:get_inventory()
		inv:set_size("main", 5)
	end,

	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for i=1,inv:get_size("main") do
			local stack = inv:get_stack("main", i)
			if not stack:is_empty() then
				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,
	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		minetest.log("action", player:get_player_name()..
				" moves stuff in mcl_hoppers at "..minetest.pos_to_string(pos))
	end,
    on_metadata_inventory_put = function(pos, listname, index, stack, player)
		minetest.log("action", player:get_player_name()..
				" moves stuff to mcl_hoppers at "..minetest.pos_to_string(pos))
	end,
    on_metadata_inventory_take = function(pos, listname, index, stack, player)
		minetest.log("action", player:get_player_name()..
				" takes stuff from mcl_hoppers at "..minetest.pos_to_string(pos))
	end,
	sounds = mcl_sounds.node_sound_metal_defaults(),
	_mcl_blast_resistance = 24,
	_mcl_hardness = 3,
})

-- Make hoppers suck in dropped items
minetest.register_abm({
	nodenames = {"mcl_hoppers:hopper","mcl_hoppers:hopper_side"},
	interval = 1.0,
	chance = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		local abovenode = minetest.get_node({x=pos.x, y=pos.y+1, z=pos.z})
		-- Don't bother checking item enties if node above is a container (should save some CPU)
		if minetest.registered_items[abovenode.name].groups.container then
			return
		end
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()

		for _,object in ipairs(minetest.get_objects_inside_radius(pos, 1)) do
			if not object:is_player() and object:get_luaentity() and object:get_luaentity().name == "__builtin:item" then
				if inv and inv:room_for_item("main", ItemStack(object:get_luaentity().itemstring)) then
					local posob = object:getpos()
					if math.abs(posob.x-pos.x) <= 0.5 and (posob.y-pos.y <= 0.85 and posob.y-pos.y >= 0.3) then
						inv:add_item("main", ItemStack(object:get_luaentity().itemstring))
						object:get_luaentity().itemstring = ""
						object:remove()
					end
				end
			end
		end
	end,
})

-- Iterates through all items in the given inventory and
-- return the slot of the first item which matches a condition
local get_eligible_transfer_item = function(inventory, list, condition)
	local size = inventory:get_size(list)
	local stack
	for i=1, size do
		stack = inventory:get_stack(list, i)
		if not stack:is_empty() and condition(stack) then
			return i
		end
	end
	return nil
end

-- Returns true if given itemstack is a shulker box
local is_not_shulker_box = function(itemstack)
	local g = minetest.get_item_group(itemstack:get_name(), "shulker_box")
	return g == 0 or g == nil
end

minetest.register_abm({
	nodenames = {"mcl_hoppers:hopper"},
	neighbors = {"group:container"},
	interval = 1.0,
	chance = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		-- Get node pos' for item transfer
		local uppos = {x=pos.x,y=pos.y+1,z=pos.z}
		local downpos = {x=pos.x,y=pos.y-1,z=pos.z}

		-- Suck an item from the container above into the hopper
		local upnode = minetest.get_node(uppos)
		local g = minetest.registered_nodes[upnode.name].groups.container
		if g == 2 or g == 3 then
			-- Typical container inventory
			mcl_util.move_item_container(uppos, "main", -1, pos)
		elseif g == 4 then
			-- Furnace output
			mcl_util.move_item_container(uppos, "dst", -1, pos)
		end

		-- Move an item from the hopper into container below
		local downnode = minetest.get_node(downpos)
		g = minetest.registered_nodes[downnode.name].groups.container
		local slot_id = -1
		if g == 3 then
			-- For shulker boxes, only select non-shulker boxes
			local sinv = minetest.get_inventory({type="node", pos = pos})
			slot_id = get_eligible_transfer_item(sinv, "main", is_not_shulker_box)
		end
		if slot_id then
			mcl_util.move_item_container(pos, "main", slot_id, downpos)
		end
	end,
})


minetest.register_abm({
	nodenames = {"mcl_hoppers:hopper_side"},
	neighbors = {"group:container"},
	interval = 1.0,
	chance = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		-- Determine to which side the hopper is facing, get nodes
		local face = minetest.get_node(pos).param2
		local front = {}
		if face == 0 then
			front = {x=pos.x-1,y=pos.y,z=pos.z}
		elseif face == 1 then
			front = {x=pos.x,y=pos.y,z=pos.z+1}
		elseif face == 2 then
			front = {x=pos.x+1,y=pos.y,z=pos.z}
		elseif face == 3 then
			front = {x=pos.x,y=pos.y,z=pos.z-1}
		end
		local above = {x=pos.x,y=pos.y+1,z=pos.z}

		local frontnode = minetest.get_node(front)

		-- Suck an item from the container above into the hopper
		local abovenode = minetest.get_node(above)
		local g = minetest.registered_nodes[abovenode.name].groups.container
		if g == 2 or g == 3 then
			-- Typical container inventory
			mcl_util.move_item_container(above, "main", -1, pos)
		elseif g == 4 then
			-- Furnace output
			mcl_util.move_item_container(above, "dst", -1, pos)
		end

		-- Move an item from the hopper into the container to which the hopper points to
		local g = minetest.registered_nodes[frontnode.name].groups.container
		if g == 2 then
			mcl_util.move_item_container(pos, "main", -1, front)
		elseif g == 3 then
			-- Put non-shulker boxes into shulker box
			local sinv = minetest.get_inventory({type="node", pos = pos})
			local slot_id = get_eligible_transfer_item(sinv, "main", is_not_shulker_box)
			if slot_id then
				mcl_util.move_item_container(pos, "main", slot_id, front)
			end
		elseif g == 4 then
			-- Put fuel into fuel slot
			local sinv = minetest.get_inventory({type="node", pos = pos})
			local slot_id = get_eligible_transfer_item(sinv, "main", mcl_util.is_fuel)
			if slot_id then
				mcl_util.move_item_container(pos, "main", slot_id, front, "fuel")
			end
		end
	end
})

minetest.register_craft({
	output = "mcl_hoppers:hopper",
	recipe = {
		{"mcl_core:iron_ingot","","mcl_core:iron_ingot"},
		{"mcl_core:iron_ingot","mcl_chests:chest","mcl_core:iron_ingot"},
		{"","mcl_core:iron_ingot",""},
	}
})

-- Legacy
minetest.register_alias("mcl_hoppers:hopper_item", "mcl_hoppers:hopper")