// Copyright (c) 2009-2010 Satoshi Nakamoto

// Copyright (c) 2009-present The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_SCRIPT_VERIFY_FLAGS_H

#define BITCOIN_SCRIPT_VERIFY_FLAGS_H

#include <compare>

#include <cstdint>

enum class script_verify_flag_name : uint8_t;

class script_verify_flags

{

public:

    using value_type = uint64_t;

    consteval script_verify_flags() = default;

    // also allow construction with hard-coded 0 (but not other integers)

    consteval explicit(false) script_verify_flags(value_type f) : m_value{f} { if (f != 0) throw 0; }

    // implicit construction from a hard-coded SCRIPT_VERIFY_* constant is also okay

    constexpr explicit(false) script_verify_flags(script_verify_flag_name f) : m_value{value_type{1} << static_cast<uint8_t>(f)} { }

    // rule of 5

    constexpr script_verify_flags(const script_verify_flags&) = default;

    constexpr script_verify_flags(script_verify_flags&&) = default;

    constexpr script_verify_flags& operator=(const script_verify_flags&) = default;

    constexpr script_verify_flags& operator=(script_verify_flags&&) = default;

    constexpr ~script_verify_flags() = default;

    // integer conversion needs to be very explicit

    static constexpr script_verify_flags from_int(value_type f) { script_verify_flags r; r.m_value = f; return r; }

    constexpr value_type as_int() const { return m_value; }

    // bitwise operations

    constexpr script_verify_flags operator~() const { return from_int(~m_value); }

    friend constexpr script_verify_flags operator|(script_verify_flags a, script_verify_flags b) { return from_int(a.m_value | b.m_value); }

    friend constexpr script_verify_flags operator&(script_verify_flags a, script_verify_flags b) { return from_int(a.m_value & b.m_value); }

    // in-place bitwise operations

    constexpr script_verify_flags& operator|=(script_verify_flags vf) { m_value |= vf.m_value; return *this; }

    constexpr script_verify_flags& operator&=(script_verify_flags vf) { m_value &= vf.m_value; return *this; }

    // tests

    constexpr explicit operator bool() const { return m_value != 0; }

    constexpr bool operator==(script_verify_flags other) const { return m_value == other.m_value; }

    /** Compare two script_verify_flags. <, >, <=, and >= are auto-generated from this. */

    friend constexpr std::strong_ordering operator<=>(const script_verify_flags& a, const script_verify_flags& b) noexcept

    {

        return a.m_value <=> b.m_value;

    }

private:

    value_type m_value{0}; // default value is SCRIPT_VERIFY_NONE

};

inline constexpr script_verify_flags operator~(script_verify_flag_name f)

{

    return ~script_verify_flags{f};

}

inline constexpr script_verify_flags operator|(script_verify_flag_name f1, script_verify_flag_name f2)

{

    return script_verify_flags{f1} | f2;

}

#endif // BITCOIN_SCRIPT_VERIFY_FLAGS_H