/*

 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#pragma once

#include "Name.h"

#include <AK/ByteString.h>

#include <AK/Format.h>

#include <AK/Traits.h>

#include <AK/Types.h>

#include <LibIPC/Forward.h>

namespace DNS {

enum class RecordType : u16 {

    A = 1,

    NS = 2,

    CNAME = 5,

    SOA = 6,

    PTR = 12,

    MX = 15,

    TXT = 16,

    AAAA = 28,

    SRV = 33,

};

enum class RecordClass : u16 {

    IN = 1

};

#define MDNS_CACHE_FLUSH 0x8000

class Answer {

public:

    Answer() = default;

    Answer(Name const& name, RecordType type, RecordClass class_code, u32 ttl, ByteString const& record_data, bool mdns_cache_flush);

    Name const& name() const { return m_name; }

    RecordType type() const { return m_type; }

    RecordClass class_code() const { return m_class_code; }

    u16 raw_class_code() const { return (u16)m_class_code | (m_mdns_cache_flush ? MDNS_CACHE_FLUSH : 0); }

    u32 ttl() const { return m_ttl; }

    time_t received_time() const { return m_received_time; }

    ByteString const& record_data() const { return m_record_data; }

    bool mdns_cache_flush() const { return m_mdns_cache_flush; }

    bool has_expired() const;

    unsigned hash() const;

    bool operator==(Answer const&) const;

private:

    Name m_name;

    RecordType m_type { 0 };

    RecordClass m_class_code { 0 };

    u32 m_ttl { 0 };

    time_t m_received_time { 0 };

    ByteString m_record_data;

    bool m_mdns_cache_flush { false };

};

}

template<>

struct AK::Traits<DNS::Answer> : public DefaultTraits<DNS::Answer> {

    static constexpr bool is_trivial() { return false; }

    static unsigned hash(DNS::Answer a) { return a.hash(); }

};

template<>

struct AK::Formatter<DNS::RecordType> : StandardFormatter {

    Formatter() = default;

    explicit Formatter(StandardFormatter formatter)

        : StandardFormatter(formatter)

    {

    }

    ErrorOr<void> format(AK::FormatBuilder&, DNS::RecordType);

};

template<>

struct AK::Formatter<DNS::RecordClass> : StandardFormatter {

    Formatter() = default;

    explicit Formatter(StandardFormatter formatter)

        : StandardFormatter(formatter)

    {

    }

    ErrorOr<void> format(AK::FormatBuilder&, DNS::RecordClass);

};

namespace IPC {

template<>

ErrorOr<void> encode(Encoder&, DNS::Answer const&);

template<>

ErrorOr<DNS::Answer> decode(Decoder&);

}