# We want:
# Track selection 1 -> s1 ready, s2 not ready, s3 ready -> switch to s3, s2 gets ready
# Track selection 2 -> s1 ready, s2 ready, s3 ready -> switch to s1
# Bug appears when it switches to s3 again on step 2
selected = ref([])
s1 = blank(duration=0.04)

def m1(_) =
  [("id", "s1")]
end

s1 = metadata.map(id="s1", m1, s1)
s2_ready = ref(false)
s2 = switch(id="s2", [({!s2_ready}, blank(duration=0.04))])

def m2(_) =
  [("id", "s2")]
end

s2 = metadata.map(id="s2", m2, s2)
s3 = blank(id="s3", duration=0.04)

def m3(_) =
  [("id", "s3")]
end

s3 = metadata.map(id="s3", m3, s3)

def f(m) =
  s2_ready := !s2_ready or m["id"] == "s3"
  selected := list.cons(m["id"], !selected)
end

s = rotate([s1, s2, s3])
s.on_track(f)
output.dummy(s)

def on_done() =
  s = list.rev(!selected)
  if
    list.nth(default="", s, 0) == "s1"
  and
    list.nth(default="", s, 1) == "s3"
  and
    list.nth(default="", s, 2) == "s1"
  and
    list.nth(default="", s, 3) == "s2"
  and
    list.nth(default="", s, 4) == "s3"
  then
    test.pass()
  else
    test.fail()
  end
end

thread.run(delay=1., on_done)
