________________________________________________________________________

This file is part of Logtalk <http://logtalk.org/>  
Copyright 1998-2016 Paulo Moura <pmoura@logtalk.org>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
________________________________________________________________________


% start by loading the example and the required library files:

| ?- logtalk_load(bricks(loader)).
...


% create four bricks, all standing on the "ground" (use your imagination... ;-)
% (don't use message broadcasting syntax in order to workaround a XSB parser bug)

| ?- brick::new(a, [position-(8, 1)]), brick::new(b, [position-(6, 1)]), brick::new(c, [position-(4, 1)]), brick::new(d, [position-(2, 1)]).
yes

% set up ascii stack monitor so we can watch the bricks moving

| ?- after_event_registry::set_monitor(_, move(_,_), _, stack_monitor).
yes


% make the stack (don't use message broadcasting syntax in order to workaround a XSB parser bug)

| ?- brick_stack::add_tuple([c,d]), brick_stack::add_tuple([b,c]), brick_stack::add_tuple([a,b]).
|.c......
|.d...b.a
---------
|.b......
|.c......
|.d.....a
---------
|.a
|.b
|.c
|.d
---
yes


% check results

| ?- brick_stack::tuple(Tuple), write(Tuple), nl, fail.
[c,d]
[b,c]
[a,b]
no

| ?- before_event_registry::monitors(Mb), after_event_registry::monitors(Ma).
Ma = [brick_stack, stack_monitor] 
Mb = [brick_stack]
yes


% move all stack to new position by moving bottom brick; check results

| ?- d::move(9, 1).
|.a.......
|.b.......
|.c.......
|........d
----------
|.a.......
|.b.......
|........c
|........d
----------
|.a.......
|........b
|........c
|........d
----------
|........a
|........b
|........c
|........d
----------
yes

| ?- a::position(Xa, Ya), b::position(Xb, Yb), c::position(Xc, Yc), d::position(Xd, Yd).
Xa = 9,
Xb = 9,
Xc = 9,
Xd = 9,
Ya = 4,
Yb = 3,
Yc = 2,
Yd = 1
yes

| ?- brick_stack::tuple(Tuple), write(Tuple), nl, fail.
[c,d]
[b,c]
[a,b]
no


% break stack in half by moving b to the "ground"; check results

| ?- b::move(3, 1).
|........a
|.........
|........c
|..b.....d
----------
|..a.....c
|..b.....d
----------
yes

| ?- a::position(Xa, Ya), b::position(Xb, Yb), c::position(Xc, Yc), d::position(Xd, Yd).
Xa = 3,
Xb = 3,
Xc = 9,
Xd = 9,
Ya = 2,
Yb = 1,
Yc = 2,
Yd = 1
yes

| ?- brick_stack::tuple(Tuple), write(Tuple), nl, fail.
[c,d]
[a,b]
no


% create new brick_stack tuple ; check results

| ?- brick_stack::add_tuple([d, a]).
|..d......
|..a.....c
|..b......
----------
|..c
|..d
|..a
|..b
----
yes

| ?- a::position(Xa, Ya), b::position(Xb, Yb), c::position(Xc, Yc), d::position(Xd, Yd).
Xa = 3,
Xb = 3,
Xc = 3,
Xd = 3,
Ya = 2,
Yb = 1,
Yc = 4,
Yd = 3
yes

| ?- brick_stack::tuple(Tuple), write(Tuple), nl, fail.
[c,d]
[a,b]
[d,a]
no


% move all stack to new position by moving bottom brick; check results

| ?- b::move(5, 1).
|..c..
|..d..
|..a..
|....b
------
|..c..
|..d..
|....a
|....b
------
|..c..
|....d
|....a
|....b
------
|....c
|....d
|....a
|....b
------
yes

| ?- a::position(Xa, Ya), b::position(Xb, Yb), c::position(Xc, Yc), d::position(Xd, Yd).
Xa = 5,
Xb = 5,
Xc = 5,
Xd = 5,
Ya = 2,
Yb = 1,
Yc = 4,
Yd = 3
yes

| ?- brick_stack::tuple(Tuple), write(Tuple), nl, fail.
[c,d]
[a,b]
[d,a]
no


% clean up instances, tuples and monitors

| ?- brick_stack::remove_all_tuples.
yes

| ?- after_event_registry::del_monitors(_, _, _, stack_monitor).
yes

| ?- brick::delete_all.
yes
