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

	meta:set_string("infotext", "Send mapblock 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

minetest.register_node("epic:send_mapblock", {
	description = "Epic send_mapblock block: sends the target mapblock to the client",
	tiles = epic.create_texture("action", "epic_anchor.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({x=0, y=0, z=0}))
		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);
		local playername = sender:get_player_name()

		if fields.setpos then
			minetest.chat_send_player(playername, "[epic] Please punch the desired target position")
			epic.punchnode_callback(sender, {
				timeout = 300,
				callback = function(punch_pos)
					local pos_str = minetest.pos_to_string(epic.to_relative_pos(pos, punch_pos))
					meta:set_string("pos", pos_str)
					minetest.chat_send_player(playername, "[epic] target position successfully set to " .. pos_str)
					update_formspec(meta)
				end
			})
		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(), epic.to_absolute_pos(pos, target_pos), "Target position", 2)
			end
		end

	end,

	epic = {
		on_enter = function(pos, meta, player, ctx)
			local rel_pos = minetest.string_to_pos(meta:get_string("pos"))
			local target_pos = epic.to_absolute_pos(pos, rel_pos)
			local block_pos = epic.get_mapblock_pos(target_pos)
			player:send_mapblock(block_pos)
			ctx.next()
		end
	}
})
