/* -*- c++ -*- */
/*
 * Copyright 2014 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */

#ifndef INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_FF_TS_IMPL_H
#define INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_FF_TS_IMPL_H

#include <gnuradio/digital/correlate_access_code_ff_ts.h>

namespace gr {
namespace digital {

class correlate_access_code_ff_ts_impl : public correlate_access_code_ff_ts
{
private:
    enum state_t { STATE_SYNC_SEARCH, STATE_HAVE_SYNC, STATE_HAVE_HEADER };

    state_t d_state;

    unsigned long long d_access_code; // access code to locate start of packet
                                      //   access code is left justified in the word
    unsigned long long d_data_reg;    // used to look for access_code
    unsigned int d_data_reg_bits = 0; // used to makes sure we've seen the whole code
    unsigned long long d_mask;        // masks access_code bits (top N bits are set where
                                      //   N is the number of bits in the access code)
    unsigned int d_threshold;         // how many bits may be wrong in sync vector
    unsigned int d_len;               // the length of the access code

    unsigned long long d_hdr_reg; // used to look for header
    int d_hdr_count;

    pmt::pmt_t d_key, d_me; // d_key is the tag name, d_me is the block name + unique ID
    int d_pkt_len, d_pkt_count;


    void enter_search();
    void enter_have_sync();
    void enter_have_header(int payload_len);

    bool header_ok();
    int header_payload();

public:
    correlate_access_code_ff_ts_impl(const std::string& access_code,
                                     int threshold,
                                     const std::string& tag_name);
    ~correlate_access_code_ff_ts_impl() override;

    int general_work(int noutput_items,
                     gr_vector_int& ninput_items,
                     gr_vector_const_void_star& input_items,
                     gr_vector_void_star& output_items) override;

    bool set_access_code(const std::string& access_code) override;
    unsigned long long access_code() const override;
};

} /* namespace digital */
} /* namespace gr */

#endif /* INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_FF_TS_IMPL_H */
