Proof using overlay_map_congr name_map_bijective multi_map_congr fail_msg_map_congr.
move => net net' failed failed' tr H_step.
invcs H_step.
- destruct (pt_map_msg m) eqn:?.
left.
destruct (net_handlers (tot_map_name to) (tot_map_name from) m0 (pt_ext_map_data (onwState net to) to)) eqn:?.
destruct p as [out' d'].
exists (map2fst (tot_map_name to) (map inr out')).
rewrite /pt_ext_map_onet /=.
apply (@StepOrderedFailure_deliver _ _ _ _ _ _ _ _ m0 (filterMap pt_map_msg ms) out' (pt_ext_map_data d to) (filterMap pt_map_name_msg l) (tot_map_name from) (tot_map_name to)) => //=.
* rewrite 2!tot_map_name_inv_inverse /= H3 /=.
case H_m1: (pt_map_msg _) => [m1|]; last by rewrite Heqo in H_m1.
rewrite Heqo in H_m1.
by inversion H_m1.
* exact: not_in_failed_not_in.
* rewrite /= tot_map_name_inv_inverse.
have H_q := @pt_ext_net_handlers_some _ _ _ _ _ _ _ multi_map_congr _ _ _ _ _ _ _ _ Heqo Heqp.
rewrite /pt_ext_mapped_net_handlers /= in H_q.
by repeat break_let; repeat tuple_inversion.
* by rewrite /= pt_ext_map_update_eq collate_pt_map_update2_eq.
right.
split => //.
have [H_eq_d H_ms] := pt_ext_net_handlers_none _ _ _ _ Heqo H5.
rewrite /pt_ext_map_onet /= pt_ext_map_update_eq H_eq_d collate_pt_map_update2_eq H_ms /=.
set nwP1 := update2 _ _ _ _ _.
set nwS1 := update _ _ _ _.
set nwP2 := fun _ _ => _.
set nwS2 := fun _ => _.
have H_eq_s: nwS1 = nwS2.
rewrite /nwS1 /nwS2 {nwS1 nwS2}.
apply functional_extensionality => n.
rewrite /update /=.
case (name_eq_dec _ _) => H_dec //.
by rewrite H_dec tot_map_name_inv_inverse.
have H_eq_p: nwP1 = nwP2.
rewrite /nwP1 /nwP2 /=.
apply functional_extensionality => src.
apply functional_extensionality => dst.
rewrite /update2 /=.
case (sumbool_and _ _ _ _) => H_dec //.
move: H_dec => [H_eq_from H_eq_to].
rewrite -H_eq_from -H_eq_to /= 2!tot_map_name_inv_inverse H3 /=.
case H_m': (pt_map_msg _) => [m'|] //.
by rewrite H_m' in Heqo.
by rewrite H_eq_s H_eq_p.
- destruct (pt_ext_map_input inp h (onwState net h)) eqn:?.
left.
destruct (input_handlers (tot_map_name h) i (pt_ext_map_data (onwState net h) h)) eqn:?.
destruct p as [out' d'].
exists ((tot_map_name h, inl i) :: map2fst (tot_map_name h) (map inr out')).
apply (@StepOrderedFailure_input _ _ _ _ (tot_map_name h) _ _ _ _ out' i (pt_ext_map_data d h) (filterMap pt_map_name_msg l)) => //=.
* exact: not_in_failed_not_in.
* rewrite /= tot_map_name_inv_inverse.
have H_q := @pt_ext_input_handlers_some _ _ _ _ _ _ _ multi_map_congr h inp (onwState net h) _ _ _ _ Heqo Heqp.
rewrite /pt_ext_mapped_input_handlers /= in H_q.
by repeat break_let; repeat tuple_inversion.
* by rewrite /pt_ext_map_onet /= pt_ext_map_update_eq collate_pt_map_eq.
right.
rewrite /= /pt_ext_map_onet /=.
have [H_d H_l] := pt_ext_input_handlers_none h inp (onwState net h) Heqo H4.
split => //.
rewrite pt_ext_map_update_eq /= H_d.
rewrite collate_pt_map_eq H_l /=.
set nwS1 := update _ _ _ _.
set nwS2 := fun n => pt_ext_map_data _ _.
have H_eq_n: nwS1 = nwS2.
rewrite /nwS1 /nwS2 /=.
apply functional_extensionality => n.
rewrite /update /=.
case (name_eq_dec _ _) => H_dec //.
by rewrite H_dec tot_map_name_inv_inverse.
by rewrite H_eq_n.
- left.
rewrite /pt_ext_map_onet /=.
set l := map2snd _ _.
have H_nd: NoDup (map (fun nm => fst nm) (filterMap pt_map_name_msg l)).
rewrite /pt_map_name_msg /=.
rewrite /l {l}.
apply NoDup_map_snd_fst.
apply (@nodup_pt_map _ _ _ _ _ _ _ msg_fail); first exact: in_map2snd_snd.
apply NoDup_map2snd.
apply NoDup_remove_all.
exact: no_dup_nodes.
move => nm nm' H_in H_in'.
by rewrite (pt_map_in_snd _ _ _ _ pt_fail_msg_fst_snd H_in) (pt_map_in_snd _ _ _ _ pt_fail_msg_fst_snd H_in').
exists [].
apply: StepOrderedFailure_fail => //.
* exact: not_in_failed_not_in.
* rewrite /=.
rewrite /l collate_pt_map_eq /pt_map_name_msg.
by rewrite (NoDup_Permutation_collate_eq _ _ _ _ _ _ _ H_nd (pt_map_map_pair_eq msg_fail h failed pt_fail_msg_fst_snd)).
Qed.

(* Specifications: *)
Corollary step_ordered_failure_pt_ext_mapped_simulation_star_1 :
forall net failed tr,
@step_ordered_failure_star _ _ overlay_fst fail_msg_fst step_ordered_failure_init (failed, net) tr ->
exists tr', @step_ordered_failure_star _ _ overlay_snd fail_msg_snd step_ordered_failure_init (map tot_map_name failed, pt_ext_map_onet net) tr'.