#ifndef DEPTHGUIDE_FRAG_BASIC_H
#define DEPTHGUIDE_FRAG_BASIC_H

#include "frag_base.hpp"

#include <boost/dynamic_bitset.hpp>

#include <list>

class frag_basic : public frag_base {
public:

    using frag_base::frag_base;

    bool send(const data_type &data) override;

    size_t max_length() const override { return UINT32_MAX; }

private:

    struct frag_header_type {
        uint32_t msg_id = 0;
        uint32_t msg_size = 0;
        uint32_t bl_num = 0;
        uint32_t bl_id = 0;
        uint32_t bl_offset = 0;

        using header_size_type = uint8_t;
        static constexpr header_size_type header_size = 5 * sizeof(uint32_t);
        static constexpr size_t extra_size = header_size + sizeof(header_size);

        template<typename ReaderType>
        void fill_from(ReaderType &reader) {
            reader >> msg_id >> msg_size >> bl_num >> bl_id >> bl_offset;
        }

        template<typename WriterType>
        void write_to(WriterType &writer) {
            writer << msg_id << msg_size << bl_num << bl_id << bl_offset;
        }
    };

    // for sending message

    uint32_t last_send_id = 0;

    // for receiving message

    using bitset_type = boost::dynamic_bitset<>;

    struct msg_info : boost::noncopyable {
        uint32_t msg_id = 0;
        bitset_type bl_ok;
        data_type data;
        size_t bytes_ok = 0;

        explicit msg_info(frag_header_type header)
                : bl_ok(header.bl_num), data(header.msg_size) {
            msg_id = header.msg_id;
        }

        bool verify(frag_header_type header) const;

        bool is_complete() const;

        void merge(frag_header_type header, const data_type &data);
    };

    using queue_type = std::list<msg_info>;

    uint32_t last_recv_id = 0; // id of last returned message
    queue_type msg_q; // message queue

    void append_data(const data_type &data) override;

};


#endif //DEPTHGUIDE_FRAG_BASIC_H