--[[

	TechAge
	=======

	Copyright (C) 2019 Joachim Stolberg

	GPL v3
	See LICENSE.txt for more information
	
	Simple TA1 Hopper
	
]]--

-- for lazy programmers
local M = minetest.get_meta
local S = techage.S

local function scan_for_objects(pos, inv)
	for _, object in pairs(minetest.get_objects_inside_radius(pos, 1)) do
		local lua_entity = object:get_luaentity()
		if not object:is_player() and lua_entity and lua_entity.name == "__builtin:item" then
			if lua_entity.itemstring ~= "" then
				local stack = ItemStack(lua_entity.itemstring)
				if inv:room_for_item("main", stack) then
					inv:add_item("main", stack)
					object:remove()
				end
			end
		end
	end
end

local function pull_push_item(pos, meta)
	local items = techage.neighbour_pull_items(pos, 6, 1)
	if items then
		if techage.neighbour_push_items(pos, meta:get_int("push_dir"), items) then
			return true
		end
		-- place item back
		techage.neighbour_unpull_items(pos, 6, items)
	end
	return false
end


local function push_item(pos, inv, meta)
	if not inv:is_empty("main") then
		local stack = inv:get_stack("main", 1)
		local taken = stack:take_item(1)
		if techage.neighbour_push_items(pos, meta:get_int("push_dir"), taken) then
			inv:set_stack("main", 1, stack)
		end
	end
end

local function node_timer(pos, elapsed)
	local meta = minetest.get_meta(pos)
	local inv = meta:get_inventory()
	if inv then
		if not pull_push_item(pos, meta) then
			scan_for_objects({x=pos.x, y=pos.y+1, z=pos.z}, inv)
			push_item(pos, inv, meta)
		end
	end
	return true
end

minetest.register_node("techage:hopper_ta1", {
	description = S("TA1 Hopper"),
	tiles = {
		-- up, down, right, left, back, front
		"default_cobble.png^techage_appl_hopper_top.png",
		"default_cobble.png^techage_appl_hopper.png",
		"default_cobble.png^techage_appl_hopper_right.png",
		"default_cobble.png^techage_appl_hopper.png",
		"default_cobble.png^techage_appl_hopper.png",
		"default_cobble.png^techage_appl_hopper.png",
	},

	drawtype = "nodebox",
	node_box = {
		type = "fixed",
		fixed = {
			{-8/16,  2/16, -8/16,  8/16, 8/16, -6/16},
			{-8/16,  2/16,  6/16,  8/16, 8/16,  8/16},
			{-8/16,  2/16, -8/16, -6/16, 8/16,  8/16},
			{ 6/16,  2/16, -8/16,  8/16, 8/16,  8/16},
			{-6/16,  0/16, -6/16,  6/16, 3/16,  6/16},
			{-5/16, -4/16, -5/16,  5/16, 0/16,  5/16},
			{ 0/16, -4/16, -3/16, 11/16, 2/16,  3/16},
		},
	},
	selection_box = {
		type = "fixed",
		fixed = {
			{-8/16,  2/16, -8/16,  8/16, 8/16,  8/16},
			{-5/16, -4/16, -5/16,  5/16, 0/16,  5/16},
			{ 0/16, -4/16, -3/16, 11/16, 2/16,  3/16},
		},
	},

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		inv:set_size('main', 1)
	end,
	
	after_place_node = function(pos, placer)
		techage.add_node(pos, "techage:hopper_ta1")
		local node = minetest.get_node(pos)
		M(pos):set_int("push_dir", techage.side_to_indir("L", node.param2))
		minetest.get_node_timer(pos):start(2)
	end,

	on_timer = node_timer,
		
	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		techage.remove_node(pos)
	end,
	
	on_rotate = screwdriver.disallow,
	paramtype = "light",
	sunlight_propagates = true,
	paramtype2 = "facedir",
	groups = {choppy=2, cracky=2, crumbly=2},
	is_ground_content = false,
	sounds = default.node_sound_wood_defaults(),
})


minetest.register_craft({
	output = "techage:hopper_ta1",
	recipe = {
		{"default:stone", "", "default:stone"},
		{"default:stone", "default:gold_ingot",	"default:stone"},
		{"", "default:stone", ""},
	},
})

techage.register_node({"techage:hopper_ta1"}, {
	on_pull_item = nil,  		-- not needed
	on_unpull_item = nil,		-- not needed
	
	on_push_item = function(pos, in_dir, stack)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		return techage.put_items(inv, "main", stack)
	end,
})	

techage.register_entry_page("ta1", "hopper",
	S("TA1 Hopper"), 
	S("The Hopper collects dropped items and pushes them to the right side.@n".. 
		"Items are sucked up when they are dropped on top of the Hopper block.@n"..
		"But the Hopper can also pull items out of chests or furnace blocks, if it is placed below."), 
	"techage:hopper_ta1")