/*++
Copyright (c) 2010 Microsoft Corporation

Module Name:

    dl_decl_plugin.h

Abstract:

    <abstract>

Author:

    Nikolaj Bjorner (nbjorner) 2010-04-10

Revision History:

--*/
#pragma once

#include "ast/ast.h"
#include "ast/arith_decl_plugin.h"
#include "ast/bv_decl_plugin.h"

namespace datalog {


    enum dl_sort_kind {
        DL_RELATION_SORT,
        DL_FINITE_SORT,
        DL_RULE_SORT
    };

    enum dl_op_kind {
        OP_RA_STORE,
        OP_RA_EMPTY,
        OP_RA_IS_EMPTY,
        OP_RA_JOIN,
        OP_RA_UNION,
        OP_RA_WIDEN,
        OP_RA_PROJECT,
        OP_RA_FILTER,
        OP_RA_NEGATION_FILTER,
        OP_RA_RENAME,
        OP_RA_COMPLEMENT,
        OP_RA_SELECT,
        OP_RA_CLONE,
        OP_DL_CONSTANT,
        OP_DL_LT,
        OP_DL_REP,
        OP_DL_ABS,
        LAST_RA_OP
    };
    
    class dl_decl_plugin : public decl_plugin {
        symbol m_store_sym;
        symbol m_empty_sym;
        symbol m_is_empty_sym;
        symbol m_join_sym;
        symbol m_union_sym;
        symbol m_widen_sym;
        symbol m_project_sym;
        symbol m_filter_sym;
        symbol m_negation_filter_sym;
        symbol m_rename_sym;
        symbol m_complement_sym;
        symbol m_select_sym;
        symbol m_clone_sym;
        symbol m_num_sym;
        symbol m_lt_sym;
        symbol m_le_sym;
        symbol m_rule_sym;

        bool check_bounds(char const* msg, unsigned low, unsigned up, unsigned val) const;
        bool check_domain(unsigned low, unsigned up, unsigned val) const;
        bool check_params(unsigned low, unsigned up, unsigned val) const;

        bool is_rel_sort(sort* s);
        bool is_rel_sort(sort* s, ptr_vector<sort>& sorts);
        bool is_fin_sort(sort* r);

        func_decl * mk_store_select(decl_kind k, unsigned arity, sort * const * domain);
        func_decl * mk_empty(parameter const& p);
        func_decl * mk_is_empty(sort* r);
        func_decl * mk_join(unsigned num_params, parameter const* params, sort* r1, sort* r2);                        
        func_decl * mk_unionw(decl_kind k, sort* s1, sort* s2);
        func_decl * mk_project(unsigned num_params, parameter const * params, sort* r); 
        func_decl * mk_filter(parameter const& p, sort* r); 
        func_decl * mk_rename(unsigned num_params, parameter const * params, sort* r);
        func_decl * mk_complement(sort* r);
        func_decl * mk_negation_filter(unsigned num_params, parameter const* params, sort* r1, sort* r2);
        func_decl * mk_constant(parameter const* params);
        func_decl * mk_compare(decl_kind k, symbol const& sym, sort*const* domain);
        func_decl * mk_clone(sort* r);
        func_decl * mk_rule(unsigned arity);
                                
        sort * mk_finite_sort(unsigned num_params, parameter const* params);
        sort * mk_relation_sort(unsigned num_params, parameter const* params);
        sort * mk_rule_sort();

    public:

        dl_decl_plugin();

        decl_plugin * mk_fresh() override { return alloc(dl_decl_plugin); }
        
        //
        // Contract for sort DL_RELATION_SORT 
        //   parameters[0]     - 1st dimension 
        //   ...
        //   parameters[n-1]   - nth dimension
        //
        // Contract for sort DL_FINITE_SORT
        //   parameters[0]     - name
        //   parameters[1]     - uint64
        //
        sort * mk_sort(decl_kind k, unsigned num_parameters, parameter const * parameters) override;
        
        //
        // Contract for func_decl:
        //   parameters[0]     - array sort
        // Contract for OP_DL_CONSTANT:
        //   parameters[0]     - rational containing uint64_t with constant value
        //   parameters[1]     - a DL_FINITE_SORT sort of the constant
        // Contract for others:
        //   no parameters
        func_decl * mk_func_decl(decl_kind k, unsigned num_parameters, parameter const * parameters,
                                 unsigned arity, sort * const * domain, sort * range) override;
        
        void get_op_names(svector<builtin_name> & op_names, symbol const & logic) override;
        
        void get_sort_names(svector<builtin_name> & sort_names, symbol const & logic) override;

        bool is_value(app * e) const override { return is_app_of(e, m_family_id, OP_DL_CONSTANT); }
        bool is_unique_value(app * e) const override { return is_value(e); }

    };

    class dl_decl_util {

        ast_manager& m;
        mutable scoped_ptr<arith_util>   m_arith;
        mutable scoped_ptr<bv_util>      m_bv;
        mutable family_id                m_fid;

        bv_util& bv() const;
        arith_util& arith() const;

    public:
        dl_decl_util(ast_manager& m);
        // create a constant belonging to a given finite domain.
        // the options include the DL_FINITE_SORT, BV_SORT, and BOOL_SORT
        app* mk_numeral(uint64_t value, sort* s);

        app* mk_lt(expr* a, expr* b);

        app* mk_le(expr* a, expr* b);

        bool is_lt(const expr* a) const { return is_app_of(a, get_family_id(), OP_DL_LT); }

        bool is_numeral(const expr* c) const { return is_app_of(c, get_family_id(), OP_DL_CONSTANT); }

        bool is_numeral(const expr* e, uint64_t& v) const;

        //
        // Utilities for extracting constants 
        // from bit-vectors and finite domains.
        // 
        bool is_numeral_ext(expr* c, uint64_t& v) const;

        bool is_numeral_ext(expr* c) const;        

        sort* mk_sort(const symbol& name, uint64_t  domain_size);

        bool try_get_size(const sort *, uint64_t& size) const;

        bool is_finite_sort(sort* s) const { 
            return is_sort_of(s, get_family_id(), DL_FINITE_SORT); 
        }

        bool is_finite_sort(expr* e) const { 
            return is_finite_sort(e->get_sort()); 
        }

        bool is_rule_sort(sort* s) const { 
            return is_sort_of(s, get_family_id(), DL_RULE_SORT); 
        }

        sort* mk_rule_sort();

        app* mk_rule(symbol const& name, unsigned num_args = 0, expr* const* args = nullptr);

        app* mk_fact(symbol const& name) { return mk_rule(name, 0, nullptr); }

        ast_manager& get_manager() const { return m; }

        family_id get_family_id() const;

    };
    
};