--[[

	TechAge
	=======

	Copyright (C) 2019 Joachim Stolberg

	LGPLv2.1+
	See LICENSE.txt for more information
	
	TA2/TA3/TA4 Pusher
	Simple node for push/pull operation of StackItems from chests or other
	inventory/server nodes to tubes or other inventory/server nodes.

                 +--------+
                /        /|
               +--------+ |
     IN (L) -->|        |X--> OUT (R)
               | PUSHER | +
               |        |/
               +--------+

]]--

-- for lazy programmers
local S = function(pos) if pos then return minetest.pos_to_string(pos) end end
local P = minetest.string_to_pos
local M = minetest.get_meta
-- Techage Related Data
local TRD = function(pos) return (minetest.registered_nodes[minetest.get_node(pos).name] or {}).techage end
local TRDN = function(node) return (minetest.registered_nodes[node.name] or {}).techage end
-- Load support for intllib.
local MP = minetest.get_modpath("techage")
local I,_ = dofile(MP.."/intllib.lua")

local STANDBY_TICKS = 10
local COUNTDOWN_TICKS = 10
local CYCLE_TIME = 2

local function pushing(pos, trd, meta, mem)
	local pull_dir = meta:get_int("pull_dir")
	local push_dir = meta:get_int("push_dir")
	local items = techage.pull_items(pos, pull_dir, trd.num_items)
	if items ~= nil then
		if techage.push_items(pos, push_dir, items) ~= true then
			-- place item back
			techage.unpull_items(pos, pull_dir, items)
			trd.State:blocked(pos, mem)
			return
		end
		trd.State:keep_running(pos, mem, COUNTDOWN_TICKS)
		return
	end
	trd.State:idle(pos, mem)
end

local function keep_running(pos, elapsed)
	local mem = tubelib2.get_mem(pos)
	local trd = TRD(pos)
	pushing(pos, trd, M(pos), mem)
	return trd.State:is_active(mem)
end	

local function on_rightclick(pos, node, clicker)
	local mem = tubelib2.get_mem(pos)
	if not minetest.is_protected(pos, clicker:get_player_name()) then
		if TRD(pos).State:is_active(mem) then
			TRD(pos).State:stop(pos, mem)
		else
			TRD(pos).State:start(pos, mem)
		end
	end
end

local function after_dig_node(pos, oldnode, oldmetadata, digger)
	techage.remove_node(pos)
	TRDN(oldnode).State:after_dig_node(pos, oldnode, oldmetadata, digger)
end

local tiles = {}
-- '#' will be replaced by the stage number
-- '{power}' will be replaced by the power PNG
tiles.pas = {
	"techage_filling_ta#.png^techage_frame_ta#_top.png^techage_appl_arrow.png",
	"techage_filling_ta#.png^techage_frame_ta#.png",
	"techage_filling_ta#.png^techage_frame_ta#.png^techage_appl_outp.png",
	"techage_filling_ta#.png^techage_frame_ta#.png^techage_appl_inp.png",
	"techage_appl_pusher.png^[transformR180]^techage_frame_ta#.png",
	"techage_appl_pusher.png^techage_frame_ta#.png",
}
tiles.act = {
	-- up, down, right, left, back, front
	"techage_filling_ta#.png^techage_frame_ta#_top.png^techage_appl_arrow.png",
	"techage_filling_ta#.png^techage_frame_ta#.png",
	"techage_filling_ta#.png^techage_frame_ta#.png^techage_appl_outp.png",
	"techage_filling_ta#.png^techage_frame_ta#.png^techage_appl_inp.png",
	{
		image = "techage_appl_pusher14.png^[transformR180]^techage_frame14_ta#.png",
		backface_culling = false,
		animation = {
			type = "vertical_frames",
			aspect_w = 32,
			aspect_h = 32,
			length = 2.0,
		},
	},
	{
		image = "techage_appl_pusher14.png^techage_frame14_ta#.png",
		backface_culling = false,
		animation = {
			type = "vertical_frames",
			aspect_w = 32,
			aspect_h = 32,
			length = 2.0,
		},
	},
}
tiles.def = {
	-- up, down, right, left, back, front
	"techage_filling_ta#.png^techage_frame_ta#_top.png^techage_appl_arrow.png",
	"techage_filling_ta#.png^techage_frame_ta#.png",
	"techage_filling_ta#.png^techage_frame_ta#.png^techage_appl_outp.png^techage_appl_defect.png",
	"techage_filling_ta#.png^techage_frame_ta#.png^techage_appl_inp.png^techage_appl_defect.png",
	"techage_appl_pusher.png^[transformR180]^techage_frame_ta#.png^techage_appl_defect.png",
	"techage_appl_pusher.png^techage_frame_ta#.png^techage_appl_defect.png",
}
	
local tubing = {
	is_pusher = true, -- is a pulling/pushing node
	
	on_recv_message = function(pos, topic, payload)
		local resp = TRD(pos).State:on_receive_message(pos, topic, payload)
		if resp then
			return resp
		else
			return "unsupported"
		end
	end,
	on_node_load = function(pos)
		TRD(pos).State:on_node_load(pos)
	end,
	on_node_repair = function(pos)
		return TRD(pos).State:on_node_repair(pos)
	end,
}
	
local node_name_ta2, node_name_ta3, node_name_ta4 = 
	techage.register_consumer("pusher", I("Pusher"), tiles, {
		cycle_time = CYCLE_TIME,
		standby_ticks = STANDBY_TICKS,
		has_item_meter = true,
		aging_factor = 10,
		tubing = tubing,
		after_place_node = function(pos, placer)
			local mem = tubelib2.get_mem(pos)
			local meta = M(pos)
			local node = minetest.get_node(pos)
			meta:set_int("pull_dir", techage.side_to_outdir("L", node.param2))
			meta:set_int("push_dir", techage.side_to_outdir("R", node.param2))
		end,

		on_rightclick = on_rightclick,
		after_dig_node = after_dig_node,
		node_timer = keep_running,
		on_rotate = screwdriver.disallow,
		
		groups = {choppy=2, cracky=2, crumbly=2},
		is_ground_content = false,
		sounds = default.node_sound_wood_defaults(),
		num_items = {0,2,6,18},
	})

minetest.register_craft({
	output = node_name_ta2.." 2",
	recipe = {
		{"group:wood", "wool:dark_green", "group:wood"},
		{"techage:tubeS", "default:mese_crystal", "techage:tubeS"},
		{"group:wood", "techage:iron_ingot", "group:wood"},
	},
})