theory ClosedFormsBounds

  imports "GeneralRegexBound" "ClosedForms"

begin

lemma alts_ders_lambda_shape_ders:

  shows "\<forall>r \<in> set (map (\<lambda>r. rders_simp r ( s)) rs ). \<exists>r1 \<in> set rs. r = rders_simp r1 s"

  by (simp add: image_iff)

lemma rlist_bound:

  assumes "\<forall>r \<in> set rs. rsize r \<le> N"

  shows "rsizes rs \<le> N * (length rs)"

  using assms

  apply(induct rs)

  apply simp

  by simp

lemma distinct_list_size_len_bounded:

  assumes "\<forall>r \<in> set rs. rsize r \<le> N" "length rs \<le> lrs"

  shows "rsizes rs \<le> lrs * N "

  using assms

  by (metis rlist_bound dual_order.trans mult.commute mult_le_mono1)

lemma alts_closed_form_bounded: 

  assumes "\<forall>r \<in> set rs. \<forall>s. rsize (rders_simp r s) \<le> N"

  shows "rsize (rders_simp (RALTS rs) s) \<le> max (Suc (N * (length rs))) (rsize (RALTS rs))"

proof (cases s)

  case Nil

  then show "rsize (rders_simp (RALTS rs) s) \<le> max (Suc (N * length rs)) (rsize (RALTS rs))"

    by simp

next

  case (Cons a s)

  from assms have "\<forall>r \<in> set (map (\<lambda>r. rders_simp r (a # s)) rs ). rsize r \<le> N"

    by (metis alts_ders_lambda_shape_ders)

  then have a: "rsizes (map (\<lambda>r. rders_simp r (a # s)) rs ) \<le> N *  (length rs)"

    by (metis length_map rlist_bound) 

  have "rsize (rders_simp (RALTS rs) (a # s)) 

          = rsize (rsimp (RALTS (map (\<lambda>r. rders_simp r (a # s)) rs)))"

    by (metis alts_closed_form_variant list.distinct(1)) 

  also have "... \<le> rsize (RALTS (map (\<lambda>r. rders_simp r (a # s)) rs))"

    using rsimp_mono by blast

  also have "... = Suc (rsizes (map (\<lambda>r. rders_simp r (a # s)) rs))"

    by simp

  also have "... \<le> Suc (N * (length rs))"

    using a by blast

  finally have "rsize (rders_simp (RALTS rs) (a # s)) \<le> max (Suc (N * length rs)) (rsize (RALTS rs))" 

    by auto

  then show ?thesis using local.Cons by simp 

qed

lemma alts_simp_ineq_unfold:

  shows "rsize (rsimp (RALTS rs)) \<le> Suc (rsizes (rdistinct (rflts (map rsimp rs)) {}))"

  using rsimp_aalts_smaller by auto

lemma rdistinct_mono_list:

  shows "rsizes (rdistinct (x5 @ rs) rset) \<le> rsizes x5 + rsizes (rdistinct  rs ((set x5 ) \<union> rset))"

  apply(induct x5 arbitrary: rs rset)

   apply simp

  apply(case_tac "a \<in> rset")

   apply simp

   apply (simp add: add.assoc insert_absorb trans_le_add2)

  apply simp

  by (metis Un_insert_right)

lemma flts_size_reduction_alts:

  assumes a: "\<And>noalts_set alts_set corr_set.

           (\<forall>r\<in>noalts_set. \<forall>xs. r \<noteq> RALTS xs) \<and>

           (\<forall>a\<in>alts_set. \<exists>xs. a = RALTS xs \<and> set xs \<subseteq> corr_set) \<Longrightarrow>

           Suc (rsizes (rdistinct (rflts rs) (noalts_set \<union> corr_set)))

           \<le> Suc (rsizes (rdistinct rs (insert RZERO (noalts_set \<union> alts_set))))"

 and b: "\<forall>r\<in>noalts_set. \<forall>xs. r \<noteq> RALTS xs"

 and c: "\<forall>a\<in>alts_set. \<exists>xs. a = RALTS xs \<and> set xs \<subseteq> corr_set"

 and d: "a = RALTS x5"

 shows "rsizes (rdistinct (rflts (a # rs)) (noalts_set \<union> corr_set))

           \<le> rsizes (rdistinct (a # rs) (insert RZERO (noalts_set \<union> alts_set)))"

  apply(case_tac "a \<in> alts_set")

  using a b c d

   apply simp

   apply(subgoal_tac "set x5 \<subseteq> corr_set")

  apply(subst rdistinct_concat)

  apply auto[1]

    apply presburger

   apply fastforce

  using a b c d

  apply (subgoal_tac "a \<notin> noalts_set")

  prefer 2

  apply blast

  apply simp

  apply(subgoal_tac "rsizes (rdistinct (x5 @ rflts rs) (noalts_set \<union> corr_set)) 

                   \<le> rsizes x5 + rsizes (rdistinct (rflts rs) ((set x5) \<union> (noalts_set \<union> corr_set)))")

  prefer 2

  using rdistinct_mono_list apply presburger

  apply(subgoal_tac "insert (RALTS x5) (noalts_set \<union> alts_set) = noalts_set \<union> (insert (RALTS x5) alts_set)")

   apply(simp only:)

  apply(subgoal_tac "rsizes x5 + rsizes (rdistinct (rflts rs) (noalts_set \<union> (corr_set \<union> (set x5)))) \<le>

           rsizes x5 + rsizes (rdistinct rs (insert RZERO (noalts_set \<union> insert (RALTS x5) alts_set)))")

  apply (simp add: Un_left_commute inf_sup_aci(5))

   apply(subgoal_tac "rsizes (rdistinct (rflts rs) (noalts_set \<union> (corr_set \<union> set x5))) \<le> 

                    rsizes (rdistinct rs (insert RZERO (noalts_set \<union> insert (RALTS x5) alts_set)))")

    apply linarith

   apply(subgoal_tac "\<forall>r \<in> insert (RALTS x5) alts_set. \<exists>xs1.( r = RALTS xs1 \<and> set xs1 \<subseteq> corr_set \<union> set x5)")

    apply presburger

   apply (meson insert_iff sup.cobounded2 sup.coboundedI1)

  by blast

lemma flts_vs_nflts1:

  assumes "\<forall>r \<in> noalts_set. \<forall>xs. r \<noteq> RALTS xs"

  and "\<forall>a \<in> alts_set. (\<exists>xs. a = RALTS xs \<and> set xs \<subseteq> corr_set)" 

  shows "rsizes (rdistinct (rflts rs) (noalts_set \<union> corr_set))

         \<le> rsizes (rdistinct rs (insert RZERO (noalts_set \<union> alts_set)))"

  using assms

    apply(induct rs arbitrary: noalts_set alts_set corr_set)

   apply simp

  apply(case_tac a)

       apply(case_tac "RZERO \<in> noalts_set")

        apply simp

       apply(subgoal_tac "RZERO \<notin> alts_set")

        apply simp

       apply fastforce

      apply(case_tac "RONE \<in> noalts_set")

       apply simp

      apply(subgoal_tac "RONE \<notin> alts_set")

  prefer 2

  apply fastforce

      apply(case_tac "RONE \<in> corr_set")

       apply(subgoal_tac "rflts (a # rs) = RONE # rflts rs")

        apply(simp only:)

        apply(subgoal_tac "rdistinct (RONE # rflts rs) (noalts_set \<union> corr_set) = 

                           rdistinct (rflts rs) (noalts_set \<union> corr_set)")

         apply(simp only:)

  apply(subgoal_tac "rdistinct (RONE # rs) (insert RZERO (noalts_set \<union> alts_set)) =

                     RONE # (rdistinct rs (insert RONE (insert RZERO (noalts_set \<union> alts_set)))) ")

          apply(simp only:)

  apply(subgoal_tac "rdistinct (rflts rs) (noalts_set \<union> corr_set) = 

                     rdistinct (rflts rs) (insert RONE (noalts_set \<union> corr_set))")

  apply (simp only:)

  apply(subgoal_tac "insert RONE (noalts_set \<union> corr_set) = (insert RONE noalts_set) \<union> corr_set")

            apply(simp only:)

  apply(subgoal_tac "insert RONE (insert RZERO (noalts_set \<union> alts_set)) = 

                     insert RZERO ((insert RONE noalts_set) \<union> alts_set)")

             apply(simp only:)

  apply(subgoal_tac "rsizes (rdistinct rs (insert RZERO (insert RONE noalts_set \<union> alts_set)))

                   \<le>  rsizes (RONE # rdistinct rs (insert RZERO (insert RONE noalts_set \<union> alts_set)))")

  apply (smt (verit, best) dual_order.trans insert_iff rrexp.distinct(15))

  apply (metis (no_types, opaque_lifting)  le_add_same_cancel2 list.simps(9) sum_list.Cons zero_le)

            apply fastforce

           apply fastforce

  apply (metis Un_iff insert_absorb)

         apply (metis UnE insertE insert_is_Un rdistinct.simps(2) rrexp.distinct(1))

        apply (meson UnCI rdistinct.simps(2))

  using rflts.simps(4) apply presburger

      apply simp

      apply(subgoal_tac "insert RONE (noalts_set \<union> corr_set) = (insert RONE noalts_set) \<union> corr_set")

  apply(simp only:)

  apply (metis Un_insert_left insertE rrexp.distinct(15))

      apply fastforce

     apply(case_tac "a \<in> noalts_set")

      apply simp

  apply(subgoal_tac "a \<notin> alts_set")

      prefer 2

      apply blast

  apply(case_tac "a \<in> corr_set")

      apply(subgoal_tac "noalts_set \<union> corr_set = insert a ( noalts_set  \<union> corr_set)")

  prefer 2

  apply fastforce

      apply(simp only:)

      apply(subgoal_tac "rsizes (rdistinct (a # rs) (insert RZERO ((insert a noalts_set) \<union> alts_set))) \<le>

              rsizes (rdistinct (a # rs) (insert RZERO (noalts_set \<union> alts_set)))")

       apply(subgoal_tac  "rsizes (rdistinct (rflts (a # rs)) ((insert a noalts_set) \<union> corr_set)) \<le>

              rsizes (rdistinct (a # rs) (insert RZERO ((insert a noalts_set) \<union> alts_set)))")

  apply fastforce

       apply simp

  apply(subgoal_tac "(insert a (noalts_set \<union> alts_set)) = (insert a noalts_set) \<union> alts_set")

        apply(simp only:)

        apply(subgoal_tac "noalts_set \<union> corr_set = (insert a noalts_set) \<union> corr_set")

  apply(simp only:)

  apply (metis insertE rrexp.distinct(21))

        apply blast

  apply fastforce

  apply force

     apply simp

     apply (metis Un_insert_left insert_iff rrexp.distinct(21))

    apply(case_tac "a \<in> noalts_set")

     apply simp

  apply(subgoal_tac "a \<notin> alts_set")

      prefer 2

      apply blast

  apply(case_tac "a \<in> corr_set")

      apply(subgoal_tac "noalts_set \<union> corr_set = insert a ( noalts_set  \<union> corr_set)")

  prefer 2

  apply fastforce

      apply(simp only:)

      apply(subgoal_tac "rsizes (rdistinct (a # rs) (insert RZERO ((insert a noalts_set) \<union> alts_set))) \<le>

             rsizes (rdistinct (a # rs) (insert RZERO (noalts_set \<union> alts_set)))")

       apply(subgoal_tac "rsizes (rdistinct (rflts (a # rs)) ((insert a noalts_set) \<union> corr_set)) \<le>

          rsizes (rdistinct (a # rs) (insert RZERO ((insert a noalts_set) \<union> alts_set)))")

  apply fastforce

       apply simp

  apply(subgoal_tac "(insert a (noalts_set \<union> alts_set)) = (insert a noalts_set) \<union> alts_set")

        apply(simp only:)

        apply(subgoal_tac "noalts_set \<union> corr_set = (insert a noalts_set) \<union> corr_set")

  apply(simp only:)

  apply (metis insertE rrexp.distinct(25))

  apply blast

  apply fastforce

  apply force

     apply simp

    apply (metis Un_insert_left insertE rrexp.distinct(25))

  using Suc_le_mono flts_size_reduction_alts apply presburger

     apply(case_tac "a \<in> noalts_set")

      apply simp

  apply(subgoal_tac "a \<notin> alts_set")

      prefer 2

      apply blast

  apply(case_tac "a \<in> corr_set")

      apply(subgoal_tac "noalts_set \<union> corr_set = insert a ( noalts_set  \<union> corr_set)")

  prefer 2

  apply fastforce

      apply(simp only:)

      apply(subgoal_tac "rsizes (rdistinct (a # rs) (insert RZERO ((insert a noalts_set) \<union> alts_set))) \<le>

               rsizes (rdistinct (a # rs) (insert RZERO (noalts_set \<union> alts_set)))")

       apply(subgoal_tac "rsizes (rdistinct (rflts (a # rs)) ((insert a noalts_set) \<union> corr_set)) \<le>

          rsizes (rdistinct (a # rs) (insert RZERO ((insert a noalts_set) \<union> alts_set)))")

  apply fastforce

       apply simp

  apply(subgoal_tac "(insert a (noalts_set \<union> alts_set)) = (insert a noalts_set) \<union> alts_set")

        apply(simp only:)

        apply(subgoal_tac "noalts_set \<union> corr_set = (insert a noalts_set) \<union> corr_set")

  apply(simp only:)

  apply (metis insertE rrexp.distinct(29))

        apply blast

  apply fastforce

  apply force

     apply simp

  apply (metis Un_insert_left insert_iff rrexp.distinct(29))

  done

lemma flts_vs_nflts:

  assumes "\<forall>r \<in> noalts_set. \<forall>xs. r \<noteq> RALTS xs"

  and "\<forall>a \<in> alts_set. (\<exists>xs. a = RALTS xs \<and> set xs \<subseteq> corr_set)"

  shows "rsizes (rdistinct (rflts rs) (noalts_set \<union> corr_set))

         \<le> rsizes (rdistinct rs (insert RZERO (noalts_set \<union> alts_set)))"

  by (simp add: assms flts_vs_nflts1)

lemma distinct_simp_ineq_general:

  assumes "rsimp ` no_simp = has_simp" "finite no_simp"

  shows "rsizes (rdistinct (map rsimp rs) has_simp) \<le> rsizes (rdistinct rs no_simp)"

  using assms

  apply(induct rs no_simp arbitrary: has_simp rule: rdistinct.induct)

  apply simp

  apply(auto)

  using add_le_mono rsimp_mono by presburger

lemma larger_acc_smaller_distinct_res0:

  assumes "ss \<subseteq> SS"

  shows "rsizes (rdistinct rs SS) \<le> rsizes (rdistinct rs ss)"

  using assms

  apply(induct rs arbitrary: ss SS)

   apply simp

  by (metis distinct_early_app1 rdistinct_smaller)

lemma without_flts_ineq:

  shows "rsizes (rdistinct (rflts rs) {}) \<le> rsizes (rdistinct rs {})"

proof -

  have "rsizes (rdistinct (rflts rs) {}) \<le>  rsizes (rdistinct rs (insert RZERO {}))"

    by (metis empty_iff flts_vs_nflts sup_bot_left)

  also have "... \<le>  rsizes (rdistinct rs {})" 

    by (simp add: larger_acc_smaller_distinct_res0)

  finally show ?thesis

    by blast

qed

lemma distinct_simp_ineq:

  shows "rsizes (rdistinct (map rsimp rs) {}) \<le> rsizes (rdistinct rs {})"

  using distinct_simp_ineq_general by blast

lemma alts_simp_control:

  shows "rsize (rsimp (RALTS rs)) \<le> Suc (rsizes (rdistinct rs {}))"

proof -

  have "rsize (rsimp (RALTS rs)) \<le> Suc (rsizes (rdistinct (rflts (map rsimp rs)) {}))"

     using alts_simp_ineq_unfold by auto

   moreover have "\<dots> \<le> Suc (rsizes (rdistinct (map rsimp rs) {}))"

    using without_flts_ineq by blast

  ultimately show "rsize (rsimp (RALTS rs)) \<le> Suc (rsizes (rdistinct rs {}))"

    by (meson Suc_le_mono distinct_simp_ineq le_trans)

qed

lemma larger_acc_smaller_distinct_res:

  shows "rsizes (rdistinct rs (insert a ss)) \<le> rsizes (rdistinct rs ss)"

  by (simp add: larger_acc_smaller_distinct_res0 subset_insertI)

lemma triangle_inequality_distinct:

  shows "rsizes (rdistinct (a # rs) ss) \<le> rsize a + rsizes (rdistinct rs ss)"

  apply(case_tac "a \<in> ss")

   apply simp

  by (simp add: larger_acc_smaller_distinct_res)

lemma rdistinct_same_set:

  shows "r \<in> set rs \<longleftrightarrow> r \<in> set (rdistinct rs {})"

  apply(induct rs)

   apply simp

  by (metis rdistinct_set_equality)

(* distinct_list_rexp_up_to_certain_size_bouded_by_set_enumerating_up_to_that_size *)

lemma distinct_list_rexp_upto:

  assumes "\<forall>r\<in> set rs. (rsize r) \<le> N"

  shows "rsizes (rdistinct rs {}) \<le> (card (sizeNregex N)) * N"

  apply(subgoal_tac "distinct (rdistinct rs {})")

  prefer 2

  using rdistinct_does_the_job apply blast

  apply(subgoal_tac "length (rdistinct rs {}) \<le> card (sizeNregex N)")

  apply(rule distinct_list_size_len_bounded)

  using assms

  apply (meson rdistinct_same_set)

   apply blast

  apply(subgoal_tac "\<forall>r \<in> set (rdistinct rs {}). rsize r \<le> N")

   prefer 2

  using assms

   apply (meson rdistinct_same_set)

  apply(subgoal_tac "length (rdistinct rs {}) = card (set (rdistinct rs {}))")

   prefer 2

  apply (simp add: distinct_card)

  apply(simp)

  by (metis card_mono finite_size_n mem_Collect_eq sizeNregex_def subsetI)

lemma star_control_bounded:

  assumes "\<forall>s. rsize (rders_simp r s) \<le> N"

  shows "rsizes (rdistinct (map (\<lambda>s1. RSEQ (rders_simp r s1) (RSTAR r)) (star_updates s r [[c]])) {}) 

     \<le> (card (sizeNregex (Suc (N + rsize (RSTAR r))))) * (Suc (N + rsize (RSTAR r)))"

  by (smt (verit) add_Suc_shift add_mono_thms_linordered_semiring(3) assms distinct_list_rexp_upto image_iff list.set_map plus_nat.simps(2) rsize.simps(5))

lemma star_closed_form_bounded:

  assumes "\<forall>s. rsize (rders_simp r s) \<le> N"

  shows "rsize (rders_simp (RSTAR r) s) \<le> 

           max ((Suc (card (sizeNregex (Suc (N + rsize (RSTAR r))))) * (Suc (N + rsize (RSTAR r))))) (rsize (RSTAR r))"

proof(cases s)

  case Nil

  then show "rsize (rders_simp (RSTAR r) s)

    \<le> max (Suc (card (sizeNregex (Suc (N + rsize (RSTAR r))))) * Suc (N + rsize (RSTAR r))) (rsize (RSTAR r))" 

    by simp

next

  case (Cons a list)

  then have "rsize (rders_simp (RSTAR r) s) = 

    rsize (rsimp (RALTS ((map (\<lambda>s1. RSEQ (rders_simp r s1) (RSTAR r)) (star_updates list r [[a]])))))"

    using star_closed_form by fastforce

  also have "... \<le> Suc (rsizes (rdistinct (map (\<lambda>s1. RSEQ (rders_simp r s1) (RSTAR r)) (star_updates list r [[a]])) {}))"

    using alts_simp_control by blast 

  also have "... \<le> Suc (card (sizeNregex (Suc (N + rsize (RSTAR r))))) * (Suc (N + rsize (RSTAR r)))" 

    using star_control_bounded[OF assms] by (metis add_mono le_add1 mult_Suc plus_1_eq_Suc)

  also have "... \<le> max (Suc (card (sizeNregex (Suc (N + rsize (RSTAR r))))) * Suc (N + rsize (RSTAR r))) (rsize (RSTAR r))"

    by simp    

  finally show ?thesis by simp  

qed

lemma seq_estimate_bounded: 

  assumes "\<forall>s. rsize (rders_simp r1 s) \<le> N1" 

      and "\<forall>s. rsize (rders_simp r2 s) \<le> N2"

  shows

    "rsizes (rdistinct (RSEQ (rders_simp r1 s) r2 # map (rders_simp r2) (vsuf s r1)) {}) 

       \<le> (Suc (N1 + (rsize r2)) + (N2 * card (sizeNregex N2)))"

proof -

  have a: "rsizes (rdistinct (map (rders_simp r2) (vsuf s r1)) {}) \<le> N2 * card (sizeNregex N2)"

    by (metis assms(2) distinct_list_rexp_upto ex_map_conv mult.commute)

  have "rsizes (rdistinct (RSEQ (rders_simp r1 s) r2 # map (rders_simp r2) (vsuf s r1)) {}) \<le>

          rsize (RSEQ (rders_simp r1 s) r2) + rsizes (rdistinct (map (rders_simp r2) (vsuf s r1)) {})"

    using triangle_inequality_distinct by blast    

  also have "... \<le> rsize (RSEQ (rders_simp r1 s) r2) + N2 * card (sizeNregex N2)"

    by (simp add: a)

  also have "... \<le> Suc (N1 + (rsize r2) + N2 * card (sizeNregex N2))"

    by (simp add: assms(1))

  finally show ?thesis

    by force

qed    

lemma seq_closed_form_bounded2: 

  assumes "\<forall>s. rsize (rders_simp r1 s) \<le> N1"

  and     "\<forall>s. rsize (rders_simp r2 s) \<le> N2"

shows "rsize (rders_simp (RSEQ r1 r2) s) 

          \<le> max (2 + N1 + (rsize r2) + (N2 * card (sizeNregex N2))) (rsize (RSEQ r1 r2))"

proof(cases s)

  case Nil

  then show "rsize (rders_simp (RSEQ r1 r2) s)

     \<le> max (2 + N1 + (rsize r2) + (N2 * card (sizeNregex N2))) (rsize (RSEQ r1 r2))" 

    by simp

next

  case (Cons a list)

  then have "rsize (rders_simp (RSEQ r1 r2) s) = 

    rsize (rsimp (RALTS ((RSEQ (rders_simp r1 s) r2) # (map (rders_simp r2) (vsuf s r1)))))" 

    using seq_closed_form_variant by (metis list.distinct(1)) 

  also have "... \<le> Suc (rsizes (rdistinct (RSEQ (rders_simp r1 s) r2 # map (rders_simp r2) (vsuf s r1)) {}))"

    using alts_simp_control by blast

  also have "... \<le> 2 + N1 + (rsize r2) + (N2 * card (sizeNregex N2))"

  using seq_estimate_bounded[OF assms] by auto

  ultimately show "rsize (rders_simp (RSEQ r1 r2) s)

       \<le> max (2 + N1 + (rsize r2) + N2 * card (sizeNregex N2)) (rsize (RSEQ r1 r2))"

    by auto 

qed

lemma rders_simp_bounded: 

  shows "\<exists>N. \<forall>s. rsize (rders_simp r s) \<le> N"

  apply(induct r)

  apply(rule_tac x = "Suc 0 " in exI)

  using three_easy_cases0 apply force

  using three_easy_cases1 apply blast

  using three_easy_casesC apply blast

  apply(erule exE)+

  apply(rule exI)

  apply(rule allI)

  apply(rule seq_closed_form_bounded2)

  apply(assumption)

  apply(assumption)

  apply (metis alts_closed_form_bounded size_list_estimation')

  using star_closed_form_bounded by blast

unused_thms

end