/******************************************
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 __SOLVERTYPESMINI_H__
#define __SOLVERTYPESMINI_H__

#if defined(_MSC_VER) || __cplusplus>=201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
    #include <cstdint>
#else
    #include <stdint.h>
#endif

#include <iostream>
#include <vector>

namespace CMSat {

#define var_Undef (0xffffffffU >> 4)

class Lit
{
    uint32_t x;
    explicit Lit(uint32_t i) : x(i) { }
public:
    Lit() : x(var_Undef<<1) {}   // (lit_Undef)
    explicit Lit(uint32_t var, bool is_inverted) :
        x(var + var + is_inverted)
    {}

    const uint32_t& toInt() const { // Guarantees small, positive integers suitable for array indexing.
        return x;
    }
    Lit  operator~() const {
        return Lit(x ^ 1);
    }
    Lit  operator^(const bool b) const {
        return Lit(x ^ (uint32_t)b);
    }
    Lit& operator^=(const bool b) {
        x ^= (uint32_t)b;
        return *this;
    }
    bool sign() const {
        return x & 1;
    }
    uint32_t  var() const {
        return x >> 1;
    }
    Lit  unsign() const {
        return Lit(x & ~1U);
    }
    bool operator==(const Lit& p) const {
        return x == p.x;
    }
    bool operator!= (const Lit& p) const {
        return x != p.x;
    }
    /**
    @brief ONLY to be used for ordering such as: a, b, ~b, etc.
    */
    bool operator <  (const Lit& p) const {
        return x < p.x;     // '<' guarantees that p, ~p are adjacent in the ordering.
    }
    bool operator >  (const Lit& p) const {
        return x > p.x;
    }
    bool operator >=  (const Lit& p) const {
        return x >= p.x;
    }
    static Lit toLit(uint32_t data)
    {
        return Lit(data);
    }
};

static const Lit lit_Undef(var_Undef, false);  // Useful special constants.
static const Lit lit_Error(var_Undef, true );  //

inline std::ostream& operator<<(std::ostream& os, const Lit lit)
{
    if (lit == lit_Undef) {
        os << "lit_Undef";
    } else {
        os << (lit.sign() ? "-" : "") << (lit.var() + 1);
    }
    return os;
}

inline std::ostream& operator<<(std::ostream& co, const std::vector<Lit>& lits)
{
    for (uint32_t i = 0; i < lits.size(); i++) {
        co << lits[i];

        if (i != lits.size()-1)
            co << " ";
    }

    return co;
}

#define l_True  lbool((uint8_t)0) // gcc does not do constant propagation if these are real constants.
#define l_False lbool((uint8_t)1)
#define l_Undef lbool((uint8_t)2)

class lbool {
    uint8_t value;

public:
    explicit lbool(uint8_t v) : value(v) { }

    lbool()       : value(0) { }
    explicit lbool(bool x) : value(!x) { }

    bool  operator == (lbool b) const {
        return ((b.value & 2) & (value & 2)) | (!(b.value & 2) & (value == b.value));
    }
    bool  operator != (lbool b) const {
        return !(*this == b);
    }
    lbool operator ^  (bool  b) const {
        return lbool((uint8_t)(value ^ (uint8_t)b));
    }

    lbool operator && (lbool b) const {
        uint8_t sel = (this->value << 1) | (b.value << 3);
        uint8_t v   = (0xF7F755F4 >> sel) & 3;
        return lbool(v);
    }

    lbool operator || (lbool b) const {
        uint8_t sel = (this->value << 1) | (b.value << 3);
        uint8_t v   = (0xFCFCF400 >> sel) & 3;
        return lbool(v);
    }

    uint8_t getValue() const { return value; }

    friend int   toInt  (lbool l);
    friend lbool toLbool(int   v);
    friend class llbool;
};

inline lbool boolToLBool(const bool b)
{
    if (b)
        return l_True;
    else
        return l_False;
}

inline std::ostream& operator<<(std::ostream& cout, const lbool val)
{
    if (val == l_True) cout << "l_True";
    if (val == l_False) cout << "l_False";
    if (val == l_Undef) cout << "l_Undef";
    return cout;
}

}

#endif //__SOLVERTYPESMINI_H__
