/*********************                                                        */
/*! \file quantifiers_modes.h
 ** \verbatim
 ** Top contributors (to current version):
 **   Andrew Reynolds, Tim King, Morgan Deters
 ** This file is part of the CVC4 project.
 ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
 ** in the top-level source directory) and their institutional affiliations.
 ** All rights reserved.  See the file COPYING in the top-level source
 ** directory for licensing information.\endverbatim
 **
 ** \brief [[ Add one-line brief description here ]]
 **
 ** [[ Add lengthier description here ]]
 ** \todo document this file
 **/

#include "cvc4_public.h"

#ifndef __CVC4__BASE__QUANTIFIERS_MODES_H
#define __CVC4__BASE__QUANTIFIERS_MODES_H

#include <iostream>

namespace CVC4 {
namespace theory {
namespace quantifiers {

enum InstWhenMode {
  /** Apply instantiation round before full effort (possibly at standard effort) */
  INST_WHEN_PRE_FULL,
  /** Apply instantiation round at full effort or above  */
  INST_WHEN_FULL,
  /** Apply instantiation round at full effort, after all other theories finish, or above  */
  INST_WHEN_FULL_DELAY,
  /** Apply instantiation round at full effort half the time, and last call always */
  INST_WHEN_FULL_LAST_CALL,
  /** Apply instantiation round at full effort after all other theories finish half the time, and last call always */
  INST_WHEN_FULL_DELAY_LAST_CALL,
  /** Apply instantiation round at last call only */
  INST_WHEN_LAST_CALL,
};

enum LiteralMatchMode {
  /** Do not consider polarity of patterns */
  LITERAL_MATCH_NONE,
  /** Conservatively consider polarity of patterns */
  LITERAL_MATCH_USE,
  /** Aggressively consider polarity of Boolean predicates */
  LITERAL_MATCH_AGG_PREDICATE,
  /** Aggressively consider polarity of all terms */
  LITERAL_MATCH_AGG,
};

enum MbqiMode {
  /** no mbqi */
  MBQI_NONE,
  /** default, mbqi from Section 5.4.2 of AJR thesis */
  MBQI_FMC,
  /** mbqi trust (produce no instantiations) */
  MBQI_TRUST,
};

enum QcfWhenMode {
  /** default, apply at full effort */
  QCF_WHEN_MODE_DEFAULT,
  /** apply at last call */
  QCF_WHEN_MODE_LAST_CALL,
  /** apply at standard effort */
  QCF_WHEN_MODE_STD,
  /** apply based on heuristics */
  QCF_WHEN_MODE_STD_H,
};

enum QcfMode {
  /** default, use qcf for conflicts only */
  QCF_CONFLICT_ONLY,
  /** use qcf for conflicts and propagations */
  QCF_PROP_EQ,
  /** use qcf for conflicts, propagations and heuristic instantiations */
  QCF_PARTIAL,
};

/** User pattern mode.
*
* These modes determine how user provided patterns (triggers) are
* used during E-matching. The modes vary on when instantiation based on
* user-provided triggers is combined with instantiation based on
* automatically selected triggers.
*/
enum UserPatMode
{
  /** First instantiate based on user-provided triggers. If no instantiations
  * are produced, use automatically selected triggers.
  */
  USER_PAT_MODE_USE,
  /** Default, if triggers are supplied for a quantifier, use only those. */
  USER_PAT_MODE_TRUST,
  /** Resort to user triggers only when no instantiations are
  * produced by automatically selected triggers
  */
  USER_PAT_MODE_RESORT,
  /** Ignore user patterns. */
  USER_PAT_MODE_IGNORE,
  /** Interleave use/resort modes for quantified formulas with user patterns. */
  USER_PAT_MODE_INTERLEAVE,
};

/** Trigger selection mode.
*
* These modes are used for determining which terms to select
* as triggers for quantified formulas, when necessary, during E-matching.
* In the following, note the following terminology. A trigger is a set of terms,
* where a single trigger is a singleton set and a multi-trigger is a set of more
* than one term.
*
* TRIGGER_SEL_MIN selects single triggers of minimal term size.
* TRIGGER_SEL_MAX selects single triggers of maximal term size.
*
* For example, consider the quantified formula :
*   forall xy. P( f( g( x, y ) ) ) V Q( f( x ), y )
*
* TRIGGER_SEL_MIN will select g( x, y ) and Q( f( x ), y ).
* TRIGGER_SEL_MAX will select P( f( g( x ) ) ) and Q( f( x ), y ).
*
* The remaining three trigger selections make a difference for multi-triggers
* only. For quantified formulas that require multi-triggers, we build a set of
* partial triggers that don't contain all variables, call this set S. Then,
* multi-triggers are built by taking a random subset of S that collectively
* contains all variables.
*
* Consider the quantified formula :
*   forall xyz. P( h( x ), y ) V Q( y, z )
*
* For TRIGGER_SEL_ALL and TRIGGER_SEL_MIN_SINGLE_ALL,
*   S = { h( x ), P( h( x ), y ), Q( y, z ) }.
* For TRIGGER_SEL_MIN_SINGLE_MAX,
*   S = { P( h( x ), y ), Q( y, z ) }.
*
* Furthermore, TRIGGER_SEL_MIN_SINGLE_ALL and TRIGGER_SEL_MIN_SINGLE_MAX, when
* selecting single triggers, only select terms of minimal size.
*/
enum TriggerSelMode {
  /** only consider minimal terms for triggers */
  TRIGGER_SEL_MIN,
  /** only consider maximal terms for triggers */
  TRIGGER_SEL_MAX,
  /** consider minimal terms for single triggers, maximal for non-single */
  TRIGGER_SEL_MIN_SINGLE_MAX,
  /** consider minimal terms for single triggers, all for non-single */
  TRIGGER_SEL_MIN_SINGLE_ALL,
  /** consider all terms for triggers */
  TRIGGER_SEL_ALL,
};

enum TriggerActiveSelMode {
  /** always use all triggers */
  TRIGGER_ACTIVE_SEL_ALL,
  /** only use triggers with minimal # of ground terms */
  TRIGGER_ACTIVE_SEL_MIN,
  /** only use triggers with maximal # of ground terms */
  TRIGGER_ACTIVE_SEL_MAX,
};

enum CVC4_PUBLIC PrenexQuantMode {
  /** do not prenex */
  PRENEX_QUANT_NONE,
  /** prenex same sign quantifiers */
  PRENEX_QUANT_SIMPLE,
  /** aggressive prenex, disjunctive prenex normal form */
  PRENEX_QUANT_DISJ_NORMAL,
  /** prenex normal form */
  PRENEX_QUANT_NORMAL,
};

enum TermDbMode {
  /** consider all terms in master equality engine */
  TERM_DB_ALL,
  /** consider only relevant terms */
  TERM_DB_RELEVANT,
};

enum IteLiftQuantMode {
  /** do not lift ITEs in quantified formulas */
  ITE_LIFT_QUANT_MODE_NONE,
  /** only lift ITEs in quantified formulas if reduces the term size */
  ITE_LIFT_QUANT_MODE_SIMPLE,
  /** lift ITEs  */
  ITE_LIFT_QUANT_MODE_ALL,
};

enum CbqiBvIneqMode
{
  /** solve for inequalities using slack values in model */
  CBQI_BV_INEQ_EQ_SLACK,
  /** solve for inequalities using boundary points */
  CBQI_BV_INEQ_EQ_BOUNDARY,
  /** solve for inequalities directly, using side conditions */
  CBQI_BV_INEQ_KEEP,
};

enum CegqiSingleInvMode {
  /** do not use single invocation techniques */
  CEGQI_SI_MODE_NONE,
  /** use single invocation techniques */
  CEGQI_SI_MODE_USE,
  /** always use single invocation techniques */
  CEGQI_SI_MODE_ALL,
};

/** Solution reconstruction modes for single invocation conjectures
 *
 * These modes indicate the policy when CVC4 solves a synthesis conjecture using
 * single invocation techniques for a sygus problem with a user-specified
 * grammar.
 */
enum CegqiSingleInvRconsMode
{
  /**
   * Do not try to reconstruct solutions to single invocation conjectures. With
   * this mode, solutions produced by CVC4 may violate grammar restrictions.
   */
  CEGQI_SI_RCONS_MODE_NONE,
  /**
   * Try to reconstruct solution to single invocation conjectures in an
   * incomplete (fail fast) way.
   */
  CEGQI_SI_RCONS_MODE_TRY,
  /**
   * Reconstruct solutions to single invocation conjectures, but fail if we
   * reach an upper limit on number of iterations in the enumeration
   */
  CEGQI_SI_RCONS_MODE_ALL_LIMIT,
  /**
   * Reconstruct solutions to single invocation conjectures. This method
   * relies on an expensive enumeration technique which only terminates when
   * we succesfully reconstruct the solution, although it may not terminate.
   */
  CEGQI_SI_RCONS_MODE_ALL,
};

enum CegisSampleMode
{
  /** do not use samples for CEGIS */
  CEGIS_SAMPLE_NONE,
  /** use samples for CEGIS */
  CEGIS_SAMPLE_USE,
  /** trust samples for CEGQI */
  CEGIS_SAMPLE_TRUST,
};

enum SygusInvTemplMode {
  /** synthesize I( x ) */
  SYGUS_INV_TEMPL_MODE_NONE,
  /** synthesize ( pre( x ) V I( x ) ) */
  SYGUS_INV_TEMPL_MODE_PRE,
  /** synthesize ( post( x ) ^ I( x ) ) */
  SYGUS_INV_TEMPL_MODE_POST,
};

enum SygusActiveGenMode
{
  /** do not use actively-generated enumerators */
  SYGUS_ACTIVE_GEN_NONE,
  /** use basic enumeration for actively-generated enumerators */
  SYGUS_ACTIVE_GEN_ENUM_BASIC,
  /** use optimized enumeration actively-generated enumerators */
  SYGUS_ACTIVE_GEN_ENUM,
  /** use variable-agnostic enumerators */
  SYGUS_ACTIVE_GEN_VAR_AGNOSTIC,
  /** internally decide the best policy for each enumerator */
  SYGUS_ACTIVE_GEN_AUTO,
};

enum SygusFilterSolMode
{
  /** do not filter solutions */
  SYGUS_FILTER_SOL_NONE,
  /** filter logically stronger solutions */
  SYGUS_FILTER_SOL_STRONG,
  /** filter logically weaker solutions */
  SYGUS_FILTER_SOL_WEAK,
};

enum MacrosQuantMode {
  /** infer all definitions */
  MACROS_QUANT_MODE_ALL,
  /** infer ground definitions */
  MACROS_QUANT_MODE_GROUND,
  /** infer ground uf definitions */
  MACROS_QUANT_MODE_GROUND_UF,
};

enum QuantDSplitMode {
  /** never do quantifiers splitting */
  QUANT_DSPLIT_MODE_NONE,
  /** default */
  QUANT_DSPLIT_MODE_DEFAULT,
  /** do quantifiers splitting aggressively */
  QUANT_DSPLIT_MODE_AGG,
};

enum QuantRepMode {
  /** let equality engine choose representatives */
  QUANT_REP_MODE_EE,
  /** default, choose representatives that appear first */
  QUANT_REP_MODE_FIRST,
  /** choose representatives that have minimal depth */
  QUANT_REP_MODE_DEPTH,
};

}/* CVC4::theory::quantifiers namespace */
}/* CVC4::theory namespace */

std::ostream& operator<<(std::ostream& out, theory::quantifiers::InstWhenMode mode) CVC4_PUBLIC;

}/* CVC4 namespace */

#endif /* __CVC4__BASE__QUANTIFIERS_MODES_H */
