/*++
Copyright (c) 2011 Microsoft Corporation

Module Name:

    cmd_context.h

Abstract:
    Ultra-light command context.
    It provides a generic command pluging infrastructure.
    A command context also provides names (aka symbols) to Z3 objects. 
    These names are used to reference Z3 objects in commands.

Author:

    Leonardo (leonardo) 2011-03-01

Notes:

--*/
#ifndef _CMD_CONTEXT_H_
#define _CMD_CONTEXT_H_

#include<sstream>
#include"ast.h"
#include"pdecl.h"
#include"front_end_params.h"
#include"dictionary.h"
#include"solver.h"
#include"datatype_decl_plugin.h"
#include"stopwatch.h"
#include"cmd_context_types.h"
#include"event_handler.h"
#include"sexpr.h"
#include"tactic_manager.h"
#include"check_logic.h"
#include"progress_callback.h"
#include"scoped_ptr_vector.h"

class func_decls {
    func_decl * m_decls;
public:
    func_decls():m_decls(0) {}
    func_decls(ast_manager & m, func_decl * f);
    void finalize(ast_manager & m);
    bool contains(func_decl * f) const;
    bool insert(ast_manager & m, func_decl * f);
    void erase(ast_manager & m, func_decl * f);
    bool more_than_one() const;
    bool clash(func_decl * f) const;
    bool empty() const { return m_decls == 0; }
    func_decl * first() const;
    func_decl * find(unsigned arity, sort * const * domain, sort * range) const;
    func_decl * find(ast_manager & m, unsigned num_args, expr * const * args, sort * range) const;
};

/**
   \brief Generic wrapper.
*/
class object_ref {
    unsigned m_ref_count;
public:
    object_ref():m_ref_count(0) {}
    virtual ~object_ref() {}
    virtual void finalize(cmd_context & ctx) = 0;
    void inc_ref(cmd_context & ctx) {
        m_ref_count++;
    }
    void dec_ref(cmd_context & ctx) {
        SASSERT(m_ref_count > 0);
        m_ref_count--;
        if (m_ref_count == 0) {
            finalize(ctx);
            dealloc(this);
        }
    }
    virtual char const * kind() const = 0;
};

class ast_object_ref : public object_ref {
    ast * m_ast;
public:
    ast_object_ref(cmd_context & ctx, ast * a);
    virtual void finalize(cmd_context & ctx);
    ast * get_ast() const { return m_ast; }
    static char const * cls_kind() { return "AST"; }
    virtual char const * kind() const { return cls_kind(); }
};

class stream_ref {
    std::string    m_default_name;
    std::ostream & m_default;
    std::string    m_name;
    std::ostream * m_stream;
    bool           m_owner;
public:
    stream_ref(std::string n, std::ostream & d):m_default_name(n), m_default(d), m_name(n), m_stream(&d), m_owner(false) {}
    ~stream_ref() { reset(); }
    void set(char const * name);
    void reset();
    std::ostream & operator*() { return *m_stream; }
    char const * name() const { return m_name.c_str(); }
};

struct builtin_decl {
    family_id      m_fid;
    decl_kind      m_decl;
    builtin_decl * m_next;
    builtin_decl():m_fid(null_family_id), m_decl(0), m_next(0) {}
    builtin_decl(family_id fid, decl_kind k, builtin_decl * n = 0):m_fid(fid), m_decl(k), m_next(n) {}
};

class cmd_context : public progress_callback, public tactic_manager {
public:
    enum status {
        UNSAT, SAT, UNKNOWN
    };
    
    enum check_sat_state {
        css_unsat, css_sat, css_unknown, css_clear
    };
    
    typedef std::pair<unsigned, expr*> macro;

    struct scoped_watch {
        cmd_context &   m_ctx;
    public:
        scoped_watch(cmd_context & ctx):m_ctx(ctx) { m_ctx.m_watch.reset(); m_ctx.m_watch.start(); }
        ~scoped_watch() { m_ctx.m_watch.stop(); }
    };

protected:
    bool                         m_main_ctx;
    front_end_params &           m_params;
    symbol                       m_logic;
    bool                         m_interactive_mode;
    bool                         m_global_decls;
    bool                         m_print_success;
    unsigned                     m_random_seed;
    bool                         m_produce_unsat_cores;
    bool                         m_produce_assignments;
    status                       m_status;
    bool                         m_numeral_as_real;
    bool                         m_ignore_check; // used by the API to disable check-sat() commands when parsing SMT 2.0 files.
    bool                         m_exit_on_error;
    
    static std::ostringstream    g_error_stream;

    ast_manager *                m_manager;
    bool                         m_own_manager;
    pdecl_manager *              m_pmanager;
    sexpr_manager *              m_sexpr_manager;
    check_logic                  m_check_logic;
    stream_ref                   m_regular;
    stream_ref                   m_diagnostic;
    dictionary<cmd*>             m_cmds;    
    dictionary<builtin_decl>     m_builtin_decls;
    scoped_ptr_vector<builtin_decl> m_extra_builtin_decls; // make sure that dynamically allocated builtin_decls are deleted
    dictionary<object_ref*>      m_object_refs; // anything that can be named.
    dictionary<sexpr*>           m_user_tactic_decls;

    dictionary<func_decls>       m_func_decls;
    obj_map<func_decl, symbol>   m_func_decl2alias;
    dictionary<psort_decl*>      m_psort_decls;
    dictionary<macro>            m_macros;
    // the following fields m_func_decls_stack, m_psort_decls_stack and m_exprs_stack are used when m_global_decls == false
    typedef std::pair<symbol, func_decl *> sf_pair;
    svector<sf_pair>             m_func_decls_stack;
    svector<symbol>              m_psort_decls_stack;
    svector<symbol>              m_macros_stack;
    // 
    ptr_vector<pdecl>            m_aux_pdecls;
    ptr_vector<expr>             m_assertions;
    vector<std::string>          m_assertion_strings;
    ptr_vector<expr>             m_assumptions; // for unsat-core extraction

    struct scope {
        unsigned m_func_decls_stack_lim;
        unsigned m_psort_decls_stack_lim;
        unsigned m_macros_stack_lim;
        unsigned m_aux_pdecls_lim;
        // only m_assertions_lim and m_assumptions_lim are relevant when m_global_decls = true
        unsigned m_assertions_lim;
        unsigned m_assumptions_lim;
    };

    svector<scope>               m_scopes;
    ref<solver>                  m_solver;
    ref<check_sat_result>        m_check_sat_result;

    stopwatch                    m_watch;

    class dt_eh : public new_datatype_eh {
        cmd_context &             m_owner;
        datatype_util             m_dt_util;
    public:
        dt_eh(cmd_context & owner);
        virtual ~dt_eh();
        virtual void operator()(sort * dt);
    };

    friend class dt_eh;
    scoped_ptr<dt_eh>             m_dt_eh;

    class pp_env;
    friend class pp_env;

    scoped_ptr<pp_env>            m_pp_env;
    pp_env & get_pp_env() const;

    void register_builtin_sorts(decl_plugin * p);
    void register_builtin_ops(decl_plugin * p);
    void register_plugin(symbol const & name, decl_plugin * p, bool install_names);
    void init_manager_core(bool new_manager);
    void init_manager();
    void init_external_manager();
    void reset_cmds();
    void finalize_cmds();

    void restore_func_decls(unsigned old_sz);
    void restore_psort_decls(unsigned old_sz);
    void restore_macros(unsigned old_sz);
    void restore_aux_pdecls(unsigned old_sz);
    void restore_assertions(unsigned old_sz);
    void restore_assumptions(unsigned old_sz);

    void erase_func_decl_core(symbol const & s, func_decl * f);
    void erase_psort_decl_core(symbol const & s);
    void erase_macro_core(symbol const & s);

    bool logic_has_arith_core(symbol const & s) const;
    bool logic_has_bv_core(symbol const & s) const;
    bool logic_has_array_core(symbol const & s) const;
    bool logic_has_seq_core(symbol const & s) const;
    bool logic_has_arith() const;
    bool logic_has_bv() const;
    bool logic_has_seq() const;
    bool logic_has_array() const;
    bool logic_has_datatype() const;
    bool logic_has_floats() const;
    bool supported_logic(symbol const & s) const;

    void print_unsupported_msg() { regular_stream() << "unsupported" << std::endl; }
    void print_unsupported_info(symbol const& s) { if (s != symbol::null) diagnostic_stream() << "; " << s << std::endl;}

public:
    cmd_context(front_end_params & params, bool main_ctx = true, ast_manager * m = 0, symbol const & l = symbol::null);
    ~cmd_context(); 
    bool is_smtlib2_compliant() const { return m_params.m_smtlib2_compliant; }
    void set_logic(symbol const & s);
    bool has_logic() const { return m_logic != symbol::null; }
    symbol const & get_logic() const { return m_logic; }
    bool is_logic(char const * l_name) const { return has_logic() && strcmp(m_logic.bare_str(), l_name) == 0; }
    bool numeral_as_real() const { return m_numeral_as_real; }
    void set_numeral_as_real(bool f) { m_numeral_as_real = f; }
    void set_interactive_mode(bool flag) { m_interactive_mode = flag; }
    void set_ignore_check(bool flag) { m_ignore_check = flag; }
    void set_exit_on_error(bool flag) { m_exit_on_error = flag; }
    bool exit_on_error() const { return m_exit_on_error; }
    bool interactive_mode() const { return m_interactive_mode; }
    void set_print_success(bool flag) { m_print_success = flag; }
    bool print_success_enabled() const { return m_print_success; }
    void print_success() { if (print_success_enabled())  regular_stream() << "success" << std::endl; }
    void print_unsupported(symbol const & s) { print_unsupported_msg(); print_unsupported_info(s); }
    bool global_decls() const { return m_global_decls; }
    void set_global_decls(bool flag) { SASSERT(!has_manager()); m_global_decls = flag; }
    unsigned random_seed() const { return m_random_seed; }
    void set_random_seed(unsigned s) { m_random_seed = s; }
    bool produce_models() const { return m_params.m_model; }
    bool produce_proofs() const { return m_params.m_proof_mode != PGM_DISABLED; }
    bool produce_unsat_cores() const { return m_produce_unsat_cores; }
    void set_produce_unsat_cores(bool flag) { m_produce_unsat_cores = flag; }
    bool produce_assignments() const { return m_produce_assignments; }
    void set_produce_assignments(bool flag) { m_produce_assignments = flag; }
    void set_status(status st) { m_status = st; }
    status get_status() const { return m_status; }
    std::string reason_unknown() const;

    bool has_manager() const { return m_manager != 0; }
    ast_manager & m() const { if (!m_manager) const_cast<cmd_context*>(this)->init_manager(); return *m_manager; }
    pdecl_manager & pm() const { if (!m_pmanager) const_cast<cmd_context*>(this)->init_manager(); return *m_pmanager; }
    sexpr_manager & sm() const { if (!m_sexpr_manager) const_cast<cmd_context*>(this)->m_sexpr_manager = alloc(sexpr_manager); return *m_sexpr_manager; }
    front_end_params & params() const { return m_params; }
 
    void set_solver(solver * s);
    solver * get_solver() const { return m_solver.get(); }
    void set_check_sat_result(check_sat_result * r) { m_check_sat_result = r; }
    check_sat_result * get_check_sat_result() const { return m_check_sat_result.get(); }
    check_sat_state cs_state() const;
    void validate_model();
    
    bool is_func_decl(symbol const & s) const;
    bool is_sort_decl(symbol const& s) const { return m_psort_decls.contains(s); }
    void insert(cmd * c);
    void insert(symbol const & s, func_decl * f); 
    void insert(func_decl * f) { insert(f->get_name(), f); }
    void insert(symbol const & s, psort_decl * p);
    void insert(psort_decl * p) { insert(p->get_name(), p); }
    void insert(symbol const & s, unsigned arity, expr * t);
    void insert(symbol const & s, object_ref *);
    void insert(tactic_cmd * c) { tactic_manager::insert(c); }
    void insert(probe_info * p) { tactic_manager::insert(p); } 
    void insert_user_tactic(symbol const & s, sexpr * d); 
    void insert_aux_pdecl(pdecl * p);
    func_decl * find_func_decl(symbol const & s) const;
    func_decl * find_func_decl(symbol const & s, unsigned num_indices, unsigned const * indices, 
                               unsigned arity, sort * const * domain, sort * range) const;
    psort_decl * find_psort_decl(symbol const & s) const;
    macro find_macro(symbol const & s) const;
    cmd * find_cmd(symbol const & s) const;
    sexpr * find_user_tactic(symbol const & s) const;
    object_ref * find_object_ref(symbol const & s) const;
    void mk_const(symbol const & s, expr_ref & result) const;
    void mk_app(symbol const & s, unsigned num_args, expr * const * args, unsigned num_indices, parameter const * indices, sort * range, 
                expr_ref & r) const;
    void erase_cmd(symbol const & s);
    void erase_func_decl(symbol const & s);
    void erase_func_decl(symbol const & s, func_decl * f);
    void erase_func_decl(func_decl * f) { erase_func_decl(f->get_name(), f); }
    void erase_psort_decl(symbol const & s);
    void erase_macro(symbol const & s);
    void erase_object_ref(symbol const & s);
    void erase_user_tactic(symbol const & s);
    void reset_func_decls();
    void reset_psort_decls();
    void reset_macros();
    void reset_object_refs();
    void reset_user_tactics();
    void set_regular_stream(char const * name) { m_regular.set(name); }
    void set_diagnostic_stream(char const * name); 
    std::ostream & regular_stream() { return *m_regular; }
    std::ostream & diagnostic_stream() { return *m_diagnostic; }
    char const * get_regular_stream_name() const { return m_regular.name(); }
    char const * get_diagnostic_stream_name() const { return m_diagnostic.name(); }
    typedef dictionary<cmd*>::iterator cmd_iterator;
    cmd_iterator begin_cmds() const { return m_cmds.begin(); }
    cmd_iterator end_cmds() const { return m_cmds.end(); }

    typedef dictionary<sexpr*>::iterator user_tactic_iterator;
    user_tactic_iterator begin_user_tactics() const { return m_user_tactic_decls.begin(); }
    user_tactic_iterator end_user_tactics() const { return m_user_tactic_decls.end(); }

    void display_assertions();
    void display_statistics(bool show_total_time = false, double total_time = 0.0);
    void reset(bool finalize = false);
    void assert_expr(expr * t);
    void assert_expr(symbol const & name, expr * t);
    void push_assert_string(std::string const & s) { SASSERT(m_interactive_mode); m_assertion_strings.push_back(s); }
    void push();
    void push(unsigned n);
    void pop(unsigned n);
    void check_sat(unsigned num_assumptions, expr * const * assumptions);
    // display the result produced by a check-sat or check-sat-using commands in the regular stream
    void display_sat_result(lbool r);
    // check if result produced by check-sat or check-sat-using matches the known status
    void validate_check_sat_result(lbool r); 
    unsigned num_scopes() const { return m_scopes.size(); }

    dictionary<macro> const & get_macros() const { return m_macros; }

    bool is_model_available() const;

    double get_seconds() const { return m_watch.get_seconds(); }

    ptr_vector<expr>::const_iterator begin_assertions() const { return m_assertions.begin(); }
    ptr_vector<expr>::const_iterator end_assertions() const { return m_assertions.end(); }

    ptr_vector<expr>::const_iterator begin_assumptions() const { return m_assumptions.begin(); }
    ptr_vector<expr>::const_iterator end_assumptions() const { return m_assumptions.end(); }

    /**
       \brief Hack: consume assertions if there are no scopes.
       This method is useful for reducing memory consumption in huge benchmarks were incrementality is not an issue.
    */
    bool consume_assertions() {
        if (num_scopes() > 0)
            return false;
        restore_assertions(0);
        restore_assumptions(0);
        return true;
    }

    format_ns::format * pp(sort * s) const;
    void pp(func_decl * f, format_ns::format_ref & r) const;
    void pp(expr * n, unsigned num_vars, char const * var_prefix, format_ns::format_ref & r, sbuffer<symbol> & var_names) const;
    void pp(expr * n, format_ns::format_ref & r) const;
    void display(std::ostream & out, sort * s, unsigned indent = 0) const;
    void display(std::ostream & out, expr * n, unsigned indent, unsigned num_vars, char const * var_prefix, sbuffer<symbol> & var_names) const;
    void display(std::ostream & out, expr * n, unsigned indent = 0) const;
    void display(std::ostream & out, func_decl * f, unsigned indent = 0) const;

    // dump assertions in out using the pretty printer.
    void dump_assertions(std::ostream & out) const;

    // display assertions as a SMT2 benchmark.
    void display_smt2_benchmark(std::ostream & out, unsigned num, expr * const * assertions, symbol const & logic = symbol::null) const;


    virtual void slow_progress_sample();
    virtual void fast_progress_sample();
};

std::ostream & operator<<(std::ostream & out, cmd_context::status st);

#endif