/******************************************
Copyright (c) 2016, Mate Soos

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
***********************************************/

#ifndef __CRYPTOMINISAT4_H__
#define __CRYPTOMINISAT4_H__

#define CRYPTOMINISAT_VERSION_MAJOR 0
#define CRYPTOMINISAT_VERSION_MINOR 0
#define CRYPTOMINISAT_VERSION_PATCH 0

#include <atomic>
#include <vector>
#include <iostream>
#include <utility>
#include "solvertypesmini.h"

namespace CMSat {
    struct CMSatPrivateData;
    class TooManyVarsError {};
    class TooLongClauseError {};
    #ifdef _WIN32
    class __declspec(dllexport) SATSolver
    #else
    class SATSolver
    #endif
    {
    public:
        SATSolver(void* config = NULL
        , std::atomic<bool>* interrupt_asap = NULL
        );
        ~SATSolver();
        unsigned nVars() const; //number of variables inside the solver
        bool add_clause(const std::vector<Lit>& lits);
        bool add_xor_clause(const std::vector<unsigned>& vars, bool rhs);
        void new_var(); //add a new variable to the solver
        void new_vars(const size_t n); //and many new variables to the solver -- a LOT faster than calling new_var() one-by-one
        lbool solve(const std::vector<Lit>* assumptions = 0); //solve the problem, optionally with assumptions
        lbool simplify(const std::vector<Lit>* assumptions = 0); //simplify the problem, optionally with assumptions
        const std::vector<lbool>& get_model() const; //get model that satisfies the problem. Only makes sense if previous solve()/simplify() call was l_True
        const std::vector<Lit>& get_conflict() const; //get conflict in terms of the assumptions given in case the previous call to solve() was l_False
        bool okay() const; //the problem is still solveable, i.e. the empty clause hasn't been derived
        void log_to_file(std::string filename);

        //SQL
        void set_sqlite(std::string filename);
        void set_mysql(
            std::string sqlServer
            , std::string sqlUser
            , std::string sqlPass
            , std::string sqlDatabase);

        void add_sql_tag(const std::string& tagname, const std::string& tag);
        unsigned long get_sql_id() const;

        //Setup
        // -- Note that nothing else can be changed, only these.
        // -- The main.cpp has access to the internal config, but it changes
        // -- all the time and hence exposing it to the outside world would
        // -- be very brittle.

        void set_num_threads(unsigned n); //Number of threads to use. Must be set before any vars/clauses are added
        void set_allow_otf_gauss(); //allow on-the-fly gaussian elimination
        void set_max_confl(int64_t max_confl); //max conflict to run to on next solve() call
        void set_verbosity(unsigned verbosity = 0); //default is 0, silent
        void set_default_polarity(bool polarity); //default polarity when branching for all vars
        void set_no_simplify(); //never simplify
        void set_no_simplify_at_startup(); //doesn't simplify at start, faster startup time
        void set_no_equivalent_lit_replacement(); //don't replace equivalent literals
        void set_no_bva(); //No bounded variable addition
        void set_greedy_undef(); //Try to set variables to l_Undef in solution
        void set_independent_vars(std::vector<uint32_t>* ind_vars);
        void set_timeout_all_calls(double secs); //max timeout on all subsequent solve() or simplify

        //Get info
        static const char* get_version(); //get solver version in string format
        static const char* get_version_sha1(); //get SHA1 version string of the solver
        static const char* get_compilation_env(); //get compilation environment string
        uint64_t get_sum_conflicts(); //get total number of conflicts of all threads
        uint64_t get_sum_propagations();  //get total number of propagations made by all threads
        uint64_t get_sum_decisions(); //get total number of decisions made by all threads

        void print_stats() const; //print solving stats. Call after solve()/simplify()
        void set_drat(std::ostream* os, bool set_ID); //set drat to ostream, e.g. stdout or a file
        void interrupt_asap(); //call this asynchronously, and the solver will try to cleanly abort asap
        void open_file_and_dump_irred_clauses(std::string fname) const; //dump irredundant clauses to this file when solving finishes
        void open_file_and_dump_red_clauses(std::string fname) const; //dump redundant ("learnt") clauses to this file when solving finishes
        void add_in_partial_solving_stats(); //used only by Ctrl+C handler. Ignore.

        std::vector<Lit> get_zero_assigned_lits() const; //get literals of fixed value
        std::vector<std::pair<Lit, Lit> > get_all_binary_xors() const; //get all binary XORs that are = 0
    private:
        CMSatPrivateData *data;
    };
}

#endif //__CRYPTOMINISAT4_H__