
-- playername => pos
local punch_handler = {}

local update_formspec = function(meta)
	local pos = meta:get_string("pos")

	meta:set_string("infotext", "Unlock block: pos=" .. pos)

	meta:set_string("formspec", "size[8,1;]" ..
		-- col 2
		"button_exit[0.1,0.5;4,1;setpos;Set position]" ..
		"button_exit[4.1,0.5;4,1;showpos;Show]" ..
		"")
end

local function do_unlock(pos, meta)
	local target_pos = epic.to_absolute_pos(pos, minetest.string_to_pos(meta:get_string("pos")))
	local target_meta = minetest.get_meta(target_pos)
	target_meta:set_int("lock", 0)
end

minetest.register_node("epic:unlock", {
	description = "Epic unlock block: unlocks a previously locked path (mutex)",
	tiles = epic.create_texture("action", "epic_unlock.png"),
	paramtype2 = "facedir",
	groups = {cracky=3,oddly_breakable_by_hand=3,epic=1},
	on_rotate = epic.on_rotate,

	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("pos", minetest.pos_to_string(pos))
		update_formspec(meta, pos)
	end,

	on_receive_fields = function(pos, _, fields, sender)
		if not sender or minetest.is_protected(pos, sender:get_player_name()) then
			-- not allowed
			return
		end

		local meta = minetest.get_meta(pos);

		if fields.setpos then
			minetest.chat_send_player(sender:get_player_name(), "[epic] Please punch the desired unlock position")
			punch_handler[sender:get_player_name()] = pos
		end

		if fields.showpos then
			local target_pos = minetest.string_to_pos(meta:get_string("pos"))
			if target_pos then
				epic.show_waypoint(sender:get_player_name(), target_pos, "Target position", 2)
			end
		end

	end,

	-- allow mesecons triggering
	mesecons = {
		effector = {
			action_on = function (pos)
				local meta = minetest.get_meta(pos)
				do_unlock(pos, meta)
			end
		}
	},

	epic = {
		on_enter = function(pos, meta, _, ctx)
			do_unlock(pos, meta)
			ctx.next()
		end
	}
})


minetest.register_on_punchnode(function(pos, node, puncher)
	local playername = puncher:get_player_name()
	local cfg_pos = punch_handler[playername]
	if cfg_pos then
		if node.name == "epic:lock" then
			local meta = minetest.get_meta(cfg_pos)
			local pos_str = minetest.pos_to_string(epic.to_relative_pos(cfg_pos, pos))
			meta:set_string("pos", pos_str)
			minetest.chat_send_player(playername, "[epic] target function successfully set to " .. pos_str)
		else
			minetest.chat_send_player(playername, "[epic] target is not a lock-node! aborting selection.")
		end
		punch_handler[playername] = nil
	end
end)

minetest.register_on_leaveplayer(function(player)
	local playername = player:get_player_name()
	punch_handler[playername] = nil

end)
