/*
 * Copyright (C) 2014 Cloudius Systems, Ltd.
 */

#ifndef SCATTERED_MESSAGE_HH
#define SCATTERED_MESSAGE_HH

#include "core/reactor.hh"
#include "core/deleter.hh"
#include "core/temporary_buffer.hh"
#include "net/packet.hh"
#include <memory>
#include <vector>

template <typename CharType>
class scattered_message {
private:
    using fragment = net::fragment;
    using packet = net::packet;
    using char_type = CharType;
    packet _p;
public:
    scattered_message() {}
    scattered_message(scattered_message&&) = default;
    scattered_message(const scattered_message&) = delete;

    void append_static(const char_type* buf, size_t size) {
        if (size) {
            _p = packet(std::move(_p), fragment{(char_type*)buf, size}, deleter());
        }
    }

    template <size_t N>
    void append_static(const char_type(&s)[N]) {
        append_static(s, N - 1);
    }

    void append_static(const char_type* s) {
        append_static(s, strlen(s));
    }

    template <typename size_type, size_type max_size>
    void append_static(const basic_sstring<char_type, size_type, max_size>& s) {
        append_static(s.begin(), s.size());
    }

    template <typename size_type, size_type max_size>
    void append(basic_sstring<char_type, size_type, max_size> s) {
        if (s.size()) {
            _p = packet(std::move(_p), std::move(s).release());
        }
    }

    template <typename size_type, size_type max_size, typename Callback>
    void append(const basic_sstring<char_type, size_type, max_size>& s, Callback callback) {
        if (s.size()) {
            _p = packet(std::move(_p), fragment{s.begin(), s.size()}, make_deleter(std::move(callback)));
        }
    }

    void reserve(int n_frags) {
        _p.reserve(n_frags);
    }

    packet release() && {
        return std::move(_p);
    }

    template <typename Callback>
    void on_delete(Callback callback) {
        _p = packet(std::move(_p), std::move(callback));
    }

    operator bool() const {
        return _p.len();
    }

    size_t size() {
        return _p.len();
    }
};

#endif