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// -*- coding: utf-8 -*-
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// Copyright (C) 2013, 2014, 2015 Laboratoire de Recherche et
// Développement de l'Epita (LRDE).
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//
// This file is part of Spot, a model checking library.
//
// Spot is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// Spot is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
// License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "common_sys.hh"

#include <string>
#include <iostream>
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#include <limits>
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#include <set>
#include <memory>
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#include <argp.h>
#include "error.h"

#include "common_setup.hh"
#include "common_finput.hh"
#include "common_cout.hh"
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#include "common_aoutput.hh"
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#include "common_range.hh"
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#include "common_post.hh"
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#include "common_conv.hh"
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#include "twaalgos/product.hh"
#include "twaalgos/isdet.hh"
#include "twaalgos/stutter.hh"
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#include "misc/optionmap.hh"
#include "misc/timer.hh"
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#include "misc/random.hh"
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#include "hoaparse/public.hh"
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#include "ltlvisit/exclusive.hh"
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#include "twaalgos/remprop.hh"
#include "twaalgos/randomize.hh"
#include "twaalgos/are_isomorphic.hh"
#include "twaalgos/canonicalize.hh"
#include "twaalgos/mask.hh"
#include "twaalgos/sbacc.hh"
#include "twaalgos/stripacc.hh"
#include "twaalgos/remfin.hh"
#include "twaalgos/cleanacc.hh"
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static const char argp_program_doc[] ="\
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Convert, transform, and filter Büchi automata.\v\
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Exit status:\n\
  0  if some automata were output\n\
  1  if no automata were output (no match)\n\
  2  if any error has been reported";
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// Keep this list sorted
enum {
  OPT_ACC_SETS = 256,
  OPT_ARE_ISOMORPHIC,
  OPT_CLEAN_ACC,
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  OPT_CNF_ACC,
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  OPT_COMPLEMENT_ACC,
  OPT_COUNT,
  OPT_DESTUT,
  OPT_DNF_ACC,
  OPT_EDGES,
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  OPT_EXCLUSIVE_AP,
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  OPT_GENERIC,
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  OPT_INSTUT,
  OPT_INTERSECT,
  OPT_IS_COMPLETE,
  OPT_IS_DETERMINISTIC,
  OPT_IS_EMPTY,
  OPT_KEEP_STATES,
  OPT_MASK_ACC,
  OPT_MERGE,
  OPT_PRODUCT,
  OPT_RANDOMIZE,
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  OPT_REM_AP,
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  OPT_REM_DEAD,
  OPT_REM_UNREACH,
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  OPT_REM_FIN,
  OPT_SBACC,
  OPT_SEED,
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  OPT_SIMPLIFY_EXCLUSIVE_AP,
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  OPT_STATES,
  OPT_STRIPACC,
  OPT_TGBA,
};
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static const argp_option options[] =
  {
    /**************************************************/
    { 0, 0, 0, 0, "Input:", 1 },
    { "file", 'F', "FILENAME", 0,
      "process the automaton in FILENAME", 0 },
    /**************************************************/
    { 0, 0, 0, 0, "Output automaton type:", 2 },
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    { "generic", OPT_GENERIC, 0, 0,
      "Any acceptance is allowed (default)", 0 },
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    { "tgba", OPT_TGBA, 0, 0,
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      "Transition-based Generalized Büchi Automaton", 0 },
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    { "ba", 'B', 0, 0, "Büchi Automaton", 0 },
    { "monitor", 'M', 0, 0, "Monitor (accepts all finite prefixes "
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      "of the given property)", 0 },
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    /**************************************************/
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    { "count", 'c', 0, 0, "print only a count of matched automata", 3 },
    { "max-count", 'n', "NUM", 0, "output at most NUM automata", 3 },
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    /**************************************************/
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    { 0, 0, 0, 0, "Transformations:", 5 },
    { "merge-transitions", OPT_MERGE, 0, 0,
      "merge transitions with same destination and acceptance", 0 },
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    { "product", OPT_PRODUCT, "FILENAME", 0,
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      "build the product with the automaton in FILENAME", 0 },
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    { "randomize", OPT_RANDOMIZE, "s|t", OPTION_ARG_OPTIONAL,
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      "randomize states and transitions (specify 's' or 't' to "
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      "randomize only states or transitions)", 0 },
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    { "instut", OPT_INSTUT, "1|2", OPTION_ARG_OPTIONAL,
      "allow more stuttering (two possible algorithms)", 0 },
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    { "destut", OPT_DESTUT, 0, 0, "allow less stuttering", 0 },
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    { "mask-acc", OPT_MASK_ACC, "NUM[,NUM...]", 0,
      "remove all transitions in specified acceptance sets", 0 },
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    { "state-based-acceptance", OPT_SBACC, 0, 0,
      "define the acceptance using states", 0 },
    { "sbacc", 0, 0, OPTION_ALIAS, 0, 0 },
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    { "strip-acceptance", OPT_STRIPACC, 0, 0,
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      "remove the acceptance condition and all acceptance sets", 0 },
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    { "keep-states", OPT_KEEP_STATES, "NUM[,NUM...]", 0,
      "only keep specified states.  The first state will be the new "\
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      "initial state.  Implies --remove-unreachable-states.", 0 },
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    { "dnf-acceptance", OPT_DNF_ACC, 0, 0,
      "put the acceptance condition in Disjunctive Normal Form", 0 },
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    { "cnf-acceptance", OPT_CNF_ACC, 0, 0,
      "put the acceptance condition in Conjunctive Normal Form", 0 },
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    { "remove-fin", OPT_REM_FIN, 0, 0,
      "rewrite the automaton without using Fin acceptance", 0 },
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    { "cleanup-acceptance", OPT_CLEAN_ACC, 0, 0,
      "remove unused acceptance sets from the automaton", 0 },
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    { "complement-acceptance", OPT_COMPLEMENT_ACC, 0, 0,
      "complement the acceptance condition (without touching the automaton)",
      0 },
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    { "exclusive-ap", OPT_EXCLUSIVE_AP, "AP,AP,...", 0,
      "if any of those APs occur in the automaton, restrict all edges to "
      "ensure two of them may not be true at the same time.  Use this option "
      "multiple times to declare independent groups of exclusive "
      "propositions.", 0 },
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    { "simplify-exclusive-ap", OPT_SIMPLIFY_EXCLUSIVE_AP, 0, 0,
      "if --exclusive-ap is used, assume those AP groups are actually exclusive"
      " in the system to simplify the expression of transition labels (implies "
      "--merge-transitions)", 0 },
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    { "remove-ap", OPT_REM_AP, "AP[=0|=1][,AP...]", 0,
      "remove atomic propositions either by existential quantification, or "
      "by assigning them 0 or 1", 0 },
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    { "remove-unreachable-states", OPT_REM_UNREACH, 0, 0,
      "remove states that are unreachable from the initial state", 0 },
    { "remove-dead-states", OPT_REM_DEAD, 0, 0,
      "remove states that are unreachable, or that cannot belong to an "
      "infinite path", 0 },
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    /**************************************************/
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    { 0, 0, 0, 0, "Filtering options:", 6 },
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    { "are-isomorphic", OPT_ARE_ISOMORPHIC, "FILENAME", 0,
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      "keep automata that are isomorphic to the automaton in FILENAME", 0 },
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    { "isomorphic", 0, 0, OPTION_ALIAS | OPTION_HIDDEN, 0, 0 },
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    { "unique", 'u', 0, 0,
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      "do not output the same automaton twice (same in the sense that they "\
      "are isomorphic)", 0 },
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    { "is-complete", OPT_IS_COMPLETE, 0, 0,
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      "keep complete automata", 0 },
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    { "is-deterministic", OPT_IS_DETERMINISTIC, 0, 0,
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      "keep deterministic automata", 0 },
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    { "is-empty", OPT_IS_EMPTY, 0, 0,
      "keep automata with an empty language", 0 },
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    { "intersect", OPT_INTERSECT, "FILENAME", 0,
      "keep automata whose languages have an non-empty intersection with"
      " the automaton from FILENAME", 0 },
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    { "invert-match", 'v', 0, 0, "select non-matching automata", 0 },
    { "states", OPT_STATES, "RANGE", 0,
      "keep automata whose number of states are in RANGE", 0 },
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    { "edges", OPT_EDGES, "RANGE", 0,
      "keep automata whose number of edges are in RANGE", 0 },
    { "acc-sets", OPT_ACC_SETS, "RANGE", 0,
      "keep automata whose number of acceptance sets are in RANGE", 0 },
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    RANGE_DOC_FULL,
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    /**************************************************/
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    { 0, 0, 0, 0, "Miscellaneous options:", -1 },
    { "extra-options", 'x', "OPTS", 0,
      "fine-tuning options (see spot-x (7))", 0 },
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    { "seed", OPT_SEED, "INT", 0,
      "seed for the random number generator (0)", 0 },
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    { 0, 0, 0, 0, 0, 0 }
  };

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static const struct argp_child children[] =
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  {
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    { &aoutput_argp, 0, 0, 0 },
    { &aoutput_io_format_argp, 0, 0, 4 },
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    { &post_argp_disabled, 0, 0, 20 },
    { &misc_argp, 0, 0, -1 },
    { 0, 0, 0, 0 }
  };

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typedef spot::twa_graph::graph_t::trans_storage_t tr_t;
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typedef std::set<std::vector<tr_t>> unique_aut_t;
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static long int match_count = 0;
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static spot::option_map extra_options;
static bool randomize_st = false;
static bool randomize_tr = false;
static int opt_seed = 0;
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// We want all these variable to be destroyed when we exit main, to
// make sure it happens before all other global variables (like the
// atomic propositions maps) are destroyed.  Otherwise we risk
// accessing deleted stuff.
static struct opt_t
{
  spot::bdd_dict_ptr dict = spot::make_bdd_dict();
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  spot::twa_graph_ptr product = nullptr;
  spot::twa_graph_ptr intersect = nullptr;
  spot::twa_graph_ptr are_isomorphic = nullptr;
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  std::unique_ptr<spot::isomorphism_checker>
                         isomorphism_checker = nullptr;
  std::unique_ptr<unique_aut_t> uniq = nullptr;
}* opt;

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static bool opt_merge = false;
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static bool opt_is_complete = false;
static bool opt_is_deterministic = false;
static bool opt_invert = false;
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static range opt_states = { 0, std::numeric_limits<int>::max() };
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static range opt_edges = { 0, std::numeric_limits<int>::max() };
static range opt_accsets = { 0, std::numeric_limits<int>::max() };
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static int opt_max_count = -1;
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static bool opt_destut = false;
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static char opt_instut = 0;
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static bool opt_is_empty = false;
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static bool opt_sbacc = false;
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static bool opt_stripacc = false;
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static bool opt_dnf_acc = false;
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static bool opt_cnf_acc = false;
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static bool opt_rem_fin = false;
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static bool opt_clean_acc = false;
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static bool opt_complement_acc = false;
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static spot::acc_cond::mark_t opt_mask_acc = 0U;
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static std::vector<bool> opt_keep_states = {};
static unsigned int opt_keep_states_initial = 0;
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static spot::exclusive_ap excl_ap;
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static spot::remove_ap rem_ap;
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static bool opt_simplify_exclusive_ap = false;
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static bool opt_rem_dead = false;
static bool opt_rem_unreach = false;
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static int
parse_opt(int key, char* arg, struct argp_state*)
{
  // This switch is alphabetically-ordered.
  switch (key)
    {
    case 'B':
      type = spot::postprocessor::BA;
      break;
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    case 'c':
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      automaton_format = Count;
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      break;
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    case 'F':
      jobs.emplace_back(arg, true);
      break;
    case 'M':
      type = spot::postprocessor::Monitor;
      break;
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    case 'n':
      opt_max_count = to_pos_int(arg);
      break;
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    case 'u':
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      opt->uniq =
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        std::unique_ptr<unique_aut_t>(new std::set<std::vector<tr_t>>());
      break;
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    case 'v':
      opt_invert = true;
      break;
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    case 'x':
      {
	const char* opt = extra_options.parse_options(arg);
	if (opt)
	  error(2, 0, "failed to parse --options near '%s'", opt);
      }
      break;
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    case OPT_ACC_SETS:
      opt_accsets = parse_range(arg, 0, std::numeric_limits<int>::max());
      break;
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    case OPT_ARE_ISOMORPHIC:
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      opt->are_isomorphic = read_automaton(arg, opt->dict);
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      break;
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    case OPT_CLEAN_ACC:
      opt_clean_acc = true;
      break;
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    case OPT_CNF_ACC:
      opt_dnf_acc = false;
      opt_cnf_acc = true;
      break;
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    case OPT_COMPLEMENT_ACC:
      opt_complement_acc = true;
      break;
    case OPT_DESTUT:
      opt_destut = true;
      break;
    case OPT_DNF_ACC:
      opt_dnf_acc = true;
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      opt_cnf_acc = false;
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      break;
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    case OPT_EDGES:
      opt_edges = parse_range(arg, 0, std::numeric_limits<int>::max());
      break;
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    case OPT_EXCLUSIVE_AP:
      excl_ap.add_group(arg);
      break;
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    case OPT_GENERIC:
      type = spot::postprocessor::Generic;
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    case OPT_INSTUT:
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      if (!arg || (arg[0] == '1' && arg[1] == 0))
	opt_instut = 1;
      else if (arg[0] == '2' && arg[1] == 0)
	opt_instut = 2;
      else
	error(2, 0, "unknown argument for --instut: %s", arg);
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      break;
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    case OPT_INTERSECT:
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      opt->intersect = read_automaton(arg, opt->dict);
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      break;
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    case OPT_IS_COMPLETE:
      opt_is_complete = true;
      break;
    case OPT_IS_DETERMINISTIC:
      opt_is_deterministic = true;
      break;
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    case OPT_IS_EMPTY:
      opt_is_empty = true;
      break;
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    case OPT_MERGE:
      opt_merge = true;
      break;
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    case OPT_MASK_ACC:
      {
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	for (auto res : to_longs(arg))
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	  {
	    if (res < 0)
	      error(2, 0, "acceptance sets should be non-negative:"
		    " --mask-acc=%ld", res);
	    if (static_cast<unsigned long>(res)
		> sizeof(spot::acc_cond::mark_t::value_t))
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	      error(2, 0, "this implementation does not support that many"
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		    " acceptance sets: --mask-acc=%ld", res);
	    opt_mask_acc.set(res);
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	  }
	break;
      }
    case OPT_KEEP_STATES:
      {
        std::vector<long> values = to_longs(arg);
        if (!values.empty())
          opt_keep_states_initial = values[0];
        for (auto res : values)
	  {
	    if (res < 0)
	      error(2, 0, "state ids should be non-negative:"
		    " --mask-acc=%ld", res);
            // We don't know yet how many states the automata contain.
            if (opt_keep_states.size() <= static_cast<unsigned long>(res))
              opt_keep_states.resize(res + 1, false);
	    opt_keep_states[res] = true;
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	  }
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	opt_rem_unreach = true;
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	break;
      }
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    case OPT_PRODUCT:
      {
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	auto a = read_automaton(arg, opt->dict);
	if (!opt->product)
	  opt->product = std::move(a);
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	else
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	  opt->product = spot::product(std::move(opt->product),
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				      std::move(a));
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      }
      break;
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    case OPT_RANDOMIZE:
      if (arg)
	{
	  for (auto p = arg; *p; ++p)
	    switch (*p)
	      {
	      case 's':
		randomize_st = true;
		break;
	      case 't':
		randomize_tr = true;
		break;
	      default:
		error(2, 0, "unknown argument for --randomize: '%c'", *p);
	      }
	}
      else
	{
	  randomize_tr = true;
	  randomize_st = true;
	}
      break;
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    case OPT_REM_AP:
      rem_ap.add_ap(arg);
      break;
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    case OPT_REM_DEAD:
      opt_rem_dead = true;
      break;
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    case OPT_REM_FIN:
      opt_rem_fin = true;
      break;
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    case OPT_REM_UNREACH:
      opt_rem_unreach = true;
      break;
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    case OPT_SBACC:
      opt_sbacc = true;
      break;
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    case OPT_SEED:
      opt_seed = to_int(arg);
      break;
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    case OPT_SIMPLIFY_EXCLUSIVE_AP:
      opt_simplify_exclusive_ap = true;
      opt_merge = true;
      break;
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    case OPT_STATES:
      opt_states = parse_range(arg, 0, std::numeric_limits<int>::max());
      break;
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    case OPT_STRIPACC:
      opt_stripacc = true;
      break;
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    case OPT_TGBA:
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      if (automaton_format == Spin)
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	error(2, 0, "--spin and --tgba are incompatible");
      type = spot::postprocessor::TGBA;
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      opt_rem_fin = true;
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      break;
    case ARGP_KEY_ARG:
      jobs.emplace_back(arg, true);
      break;

    default:
      return ARGP_ERR_UNKNOWN;
    }
  return 0;
}


namespace
{
  class hoa_processor: public job_processor
  {
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  private:
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    spot::postprocessor& post;
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    automaton_printer printer;
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  public:
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    hoa_processor(spot::postprocessor& post)
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      : post(post), printer(aut_input)
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    {
    }

    int
    process_formula(const spot::ltl::formula*, const char*, int)
    {
      SPOT_UNREACHABLE();
    }

    int
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    process_automaton(const spot::const_hoa_aut_ptr& haut,
		      const char* filename)
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    {
      spot::stopwatch sw;
      sw.start();
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      // If --stats or --name is used, duplicate the automaton so we
      // never modify the original automaton (e.g. with
      // merge_transitions()) and the statistics about it make sense.
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      auto aut = ((automaton_format == Stats) || opt_name)
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	? spot::make_twa_graph(haut->aut, spot::twa::prop_set::all())
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	: haut->aut;
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      // Preprocessing.

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      if (opt_stripacc)
	spot::strip_acceptance_here(aut);
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      if (opt_merge)
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	aut->merge_transitions();
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      if (opt_clean_acc || opt_rem_fin)
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	cleanup_acceptance_here(aut);
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      if (opt_complement_acc)
	aut->set_acceptance(aut->acc().num_sets(),
			    aut->get_acceptance().complement());
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      if (opt_rem_fin)
	aut = remove_fin(aut);
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      if (opt_dnf_acc)
	aut->set_acceptance(aut->acc().num_sets(),
			    aut->get_acceptance().to_dnf());
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      if (opt_cnf_acc)
	aut->set_acceptance(aut->acc().num_sets(),
			    aut->get_acceptance().to_cnf());
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      // Filters.

      bool matched = true;

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      matched &= opt_states.contains(aut->num_states());
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      matched &= opt_edges.contains(aut->num_transitions());
      matched &= opt_accsets.contains(aut->acc().num_sets());
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      if (opt_is_complete)
	matched &= is_complete(aut);
      if (opt_is_deterministic)
	matched &= is_deterministic(aut);
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      if (opt->are_isomorphic)
        matched &= opt->isomorphism_checker->is_isomorphic(aut);
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      if (opt_is_empty)
	matched &= aut->is_empty();
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      if (opt->intersect)
	matched &= !spot::product(aut, opt->intersect)->is_empty();
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      // Drop or keep matched automata depending on the --invert option
      if (matched == opt_invert)
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        return 0;

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      ++match_count;
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      // Postprocessing.

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      if (opt_mask_acc)
	aut = mask_acc_sets(aut, opt_mask_acc & aut->acc().all_sets());

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      if (!excl_ap.empty())
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	aut = excl_ap.constrain(aut, opt_simplify_exclusive_ap);
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      if (!rem_ap.empty())
	aut = rem_ap.strip(aut);

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      if (opt_destut)
	aut = spot::closure(std::move(aut));
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      if (opt_instut == 1)
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	aut = spot::sl(std::move(aut));
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      else if (opt_instut == 2)
	aut = spot::sl2(std::move(aut));
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      if (!opt_keep_states.empty())
	aut = mask_keep_states(aut, opt_keep_states, opt_keep_states_initial);
      if (opt_rem_dead)
	aut->purge_dead_states();
      else if (opt_rem_unreach)
	aut->purge_unreachable_states();

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      if (opt->product)
	aut = spot::product(std::move(aut), opt->product);
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      if (opt_sbacc)
	aut = spot::sbacc(aut);

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      aut = post.run(aut, nullptr);
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      if (randomize_st || randomize_tr)
	spot::randomize(aut, randomize_st, randomize_tr);

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      const double conversion_time = sw.stop();

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      if (opt->uniq)
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        {
          auto tmp =
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	    spot::canonicalize(make_twa_graph(aut,
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						 spot::twa::prop_set::all()));
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          if (!opt->uniq->emplace(tmp->transition_vector().begin() + 1,
				  tmp->transition_vector().end()).second)
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	    return 0;
        }

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      printer.print(aut, nullptr, filename, -1, conversion_time, haut);
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      if (opt_max_count >= 0 && match_count >= opt_max_count)
	abort_run = true;

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      return 0;
    }
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    int
    aborted(const spot::const_hoa_aut_ptr& h, const char* filename)
    {
      std::cerr << filename << ':' << h->loc << ": aborted input automaton\n";
      return 2;
    }
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    int
    process_file(const char* filename)
    {
      spot::hoa_parse_error_list pel;
      auto hp = spot::hoa_stream_parser(filename);

      int err = 0;

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      while (!abort_run)
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	{
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	  pel.clear();
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	  auto haut = hp.parse(pel, opt->dict);
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	  if (!haut && pel.empty())
	    break;
	  if (spot::format_hoa_parse_errors(std::cerr, filename, pel))
	    err = 2;
	  if (!haut)
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	    error(2, 0, "failed to read automaton from %s", filename);
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	  else if (haut->aborted)
	    err = std::max(err, aborted(haut, filename));
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	  else
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            process_automaton(haut, filename);
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	}

      return err;
    }
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  };
}

int
main(int argc, char** argv)
{
  setup(argv);

  const argp ap = { options, parse_opt, "[FILENAMES...]",
		    argp_program_doc, children, 0, 0 };

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  try
    {
      // This will ensure that all objects stored in this struct are
      // destroyed before global variables.
      opt_t o;
      opt = &o;
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      // Disable post-processing as much as possible by default.
      level = spot::postprocessor::Low;
      pref = spot::postprocessor::Any;
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      type = spot::postprocessor::Generic;
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      if (int err = argp_parse(&ap, argc, argv, ARGP_NO_HELP, 0, 0))
	exit(err);
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      if (jobs.empty())
	jobs.emplace_back("-", true);
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      if (opt->are_isomorphic)
	{
	  if (opt_merge)
	    opt->are_isomorphic->merge_transitions();
	  opt->isomorphism_checker = std::unique_ptr<spot::isomorphism_checker>
	    (new spot::isomorphism_checker(opt->are_isomorphic));
	}
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      spot::srand(opt_seed);
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      spot::postprocessor post(&extra_options);
      post.set_pref(pref | comp);
      post.set_type(type);
      post.set_level(level);
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      hoa_processor processor(post);
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      if (processor.run())
	return 2;
    }
  catch (const std::runtime_error& e)
    {
      error(2, 0, "%s", e.what());
    }
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  catch (const std::invalid_argument& e)
    {
      error(2, 0, "%s", e.what());
    }
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  if (automaton_format == Count)
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    std::cout << match_count << std::endl;
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  return !match_count;
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}