/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __AIS_BASEBAND_H__
#define __AIS_BASEBAND_H__

#include <cstdint>
#include <cstddef>
#include <complex>
#include <array>
#include <bitset>
#include <utility>

namespace baseband {
namespace ais {

// RRC length should be about 4 x the symbol length to do a good job of
// cleaning up ISI.
/*
constexpr std::array<std::complex<float>, 8> rrc_taps_8_p { {
	{  0.00533687f,  0.00000000f }, { -0.00667109f,  0.00667109f },
	{  0.00000000f,  0.01334218f }, { -0.05145006f, -0.05145006f },
	{ -0.14292666f,  0.00000000f }, { -0.05145006f,  0.05145006f },
	{  0.00000000f, -0.01334218f }, { -0.00667109f, -0.00667109f },
} };
*/
//
// These came from GRC directly, and have a bit more gain, it appears.
//

constexpr std::array<std::complex<float>, 8> rrc_taps_128_decim_16_p { {
	{  2.1046938375e-02f,  0.0000000000e+00f }, { -2.6308671336e-02f, -2.6308671336e-02f },
	{ -3.2218829289e-18f, -5.2617341280e-02f }, { -2.0290270482e-01f,  2.0290270482e-01f },
	{ -5.6365746260e-01f,  6.9028130738e-17f }, { -2.0290270482e-01f, -2.0290270482e-01f },
	{  9.6656487867e-18f,  5.2617341280e-02f }, { -2.6308671336e-02f,  2.6308671336e-02f },
} };

constexpr std::array<std::complex<float>, 16> rrc_taps_128_decim_8_p { {
	{ -5.0682835281e-03f,  0.0000000000e+00f }, {  3.8012127427e-03f,  3.8012127427e-03f },
	{  9.3102863700e-20f,  1.5204851516e-03f }, {  5.3216978397e-03f, -5.3216978397e-03f },
	{ -2.1286793053e-02f,  2.6068802977e-18f }, {  2.6608490845e-02f,  2.6608490845e-02f },
	{  9.7758004319e-18f,  5.3216978908e-02f }, {  2.0521502845e-01f, -2.0521502845e-01f },
	{  5.7008099556e-01f, -1.3962957329e-16f }, {  2.0521502845e-01f,  2.0521502845e-01f },
	{ -1.6293000720e-17f, -5.3216978908e-02f }, {  2.6608490845e-02f, -2.6608490845e-02f },
	{ -2.1286793053e-02f,  7.8206408930e-18f }, {  5.3216978397e-03f,  5.3216978397e-03f },
	{ -6.5172004590e-19f, -1.5204851516e-03f }, {  3.8012127427e-03f, -3.8012127427e-03f },
} };

constexpr std::array<std::complex<float>, 32> rrc_taps_128_decim_4_p { {
	{ -1.2495006667e-03f,  0.0000000000e+00f }, {  7.5862532786e-04f,  7.5862532786e-04f },
	{  7.1465238505e-21f,  1.1671159155e-04f }, {  8.7533694842e-04f, -8.7533694842e-04f },
	{ -2.2281305864e-03f,  2.7286729908e-19f }, {  1.4482847468e-03f,  1.4482847468e-03f },
	{  5.9121245638e-20f,  3.2184107113e-04f }, {  1.7701258199e-03f, -1.7701258199e-03f },
	{ -5.0575020723e-03f,  1.2387307449e-18f }, {  3.7931268039e-03f,  3.7931268039e-03f },
	{  4.6452407924e-19f,  1.5172507847e-03f }, {  5.3103774596e-03f, -5.3103774596e-03f },
	{ -2.1241510287e-02f,  7.8040042746e-18f }, {  2.6551890262e-02f,  2.6551890262e-02f },
	{  2.2761678735e-17f,  5.3103774786e-02f }, {  2.0477849246e-01f, -2.0477849246e-01f },
	{  5.6886833906e-01f, -2.7866511623e-16f }, {  2.0477849246e-01f,  2.0477849246e-01f },
	{ -2.9265015516e-17f, -5.3103774786e-02f }, {  2.6551890262e-02f, -2.6551890262e-02f },
	{ -2.1241510287e-02f,  1.3006673791e-17f }, {  5.3103774596e-03f,  5.3103774596e-03f },
	{ -3.7171317828e-18f, -1.5172507847e-03f }, {  3.7931268039e-03f, -3.7931268039e-03f },
	{ -5.0575020723e-03f,  3.7161922347e-18f }, {  1.7701258199e-03f,  1.7701258199e-03f },
	{  3.1551252346e-19f, -3.2184107113e-04f }, {  1.4482847468e-03f, -1.4482847468e-03f },
	{ -2.2281305864e-03f,  1.9100710935e-18f }, {  8.7533694842e-04f,  8.7533694842e-04f },
	{ -3.1451929164e-19f, -1.1671159155e-04f }, {  7.5862532786e-04f, -7.5862532786e-04f },
} };

constexpr std::array<std::complex<float>, 64> rrc_taps_128_decim_2_p { {
	{ -6.2437308952e-04f,  0.0000000000e+00f }, { -2.2010185825e-04f, -9.1169174792e-05f },
	{  3.7908365508e-04f,  3.7908365508e-04f }, {  2.8756602409e-04f,  6.9424579543e-04f },
	{  3.5711042529e-21f,  5.8320558310e-05f }, {  2.8756602409e-04f, -6.9424579543e-04f },
	{  4.3740419207e-04f, -4.3740419207e-04f }, { -3.9158988624e-04f,  1.6220184177e-04f },
	{ -1.1133925291e-03f,  1.3635125969e-19f }, { -3.9158988624e-04f, -1.6220184177e-04f },
	{  7.2370509982e-04f,  7.2370509982e-04f }, {  5.6432127027e-04f,  1.3623920642e-03f },
	{  2.9542774240e-20f,  1.6082337243e-04f }, {  5.6432127027e-04f, -1.3623920642e-03f },
	{  8.8452850107e-04f, -8.8452850107e-04f }, { -8.8299684291e-04f,  3.6574926787e-04f },
	{ -2.5272241328e-03f,  6.1899138899e-19f }, { -8.8299684291e-04f, -3.6574926787e-04f },
	{  1.8954181931e-03f,  1.8954181931e-03f }, {  1.5745747777e-03f,  3.8013597832e-03f },
	{  2.3212178869e-19f,  7.5816729805e-04f }, {  1.5745747777e-03f, -3.8013597832e-03f },
	{  2.6535855032e-03f, -2.6535855032e-03f }, { -3.5740348583e-03f,  1.4804137107e-03f },
	{ -1.0614342056e-02f,  3.8996460073e-18f }, { -3.5740348583e-03f, -1.4804137107e-03f },
	{  1.3267928010e-02f,  1.3267928010e-02f }, {  1.5010946154e-02f,  3.6239629790e-02f },
	{  1.1373966922e-17f,  2.6535853744e-02f }, {  1.5010946154e-02f, -3.6239629790e-02f },
	{  1.0232741681e-01f, -1.0232741681e-01f }, {  2.2516419801e-01f, -9.3266064576e-02f },
	{  2.8426241875e-01f, -1.3924842449e-16f }, {  2.2516419801e-01f,  9.3266064576e-02f },
	{  1.0232741681e-01f,  1.0232741681e-01f }, {  1.5010946154e-02f,  3.6239629790e-02f },
	{ -1.4623671757e-17f, -2.6535853744e-02f }, {  1.5010946154e-02f, -3.6239629790e-02f },
	{  1.3267928010e-02f, -1.3267928010e-02f }, { -3.5740348583e-03f,  1.4804137107e-03f },
	{ -1.0614342056e-02f,  6.4994100121e-18f }, { -3.5740348583e-03f, -1.4804137107e-03f },
	{  2.6535855032e-03f,  2.6535855032e-03f }, {  1.5745747777e-03f,  3.8013597832e-03f },
	{ -1.8574436004e-18f, -7.5816729805e-04f }, {  1.5745747777e-03f, -3.8013597832e-03f },
	{  1.8954181931e-03f, -1.8954181931e-03f }, { -8.8299684291e-04f,  3.6574926787e-04f },
	{ -2.5272241328e-03f,  1.8569741670e-18f }, { -8.8299684291e-04f, -3.6574926787e-04f },
	{  8.8452850107e-04f,  8.8452850107e-04f }, {  5.6432127027e-04f,  1.3623920642e-03f },
	{  1.5766100917e-19f, -1.6082337243e-04f }, {  5.6432127027e-04f, -1.3623920642e-03f },
	{  7.2370509982e-04f, -7.2370509982e-04f }, { -3.9158988624e-04f,  1.6220184177e-04f },
	{ -1.1133925291e-03f,  9.5445881785e-19f }, { -3.9158988624e-04f, -1.6220184177e-04f },
	{  4.3740419207e-04f,  4.3740419207e-04f }, {  2.8756602409e-04f,  6.9424579543e-04f },
	{ -1.5716468643e-19f, -5.8320558310e-05f }, {  2.8756602409e-04f, -6.9424579543e-04f },
	{  3.7908365508e-04f, -3.7908365508e-04f }, { -2.2010185825e-04f,  9.1169174792e-05f },
} };

constexpr std::array<std::complex<float>, 128> rrc_taps_128_decim_1_p { {
	{ -3.1209018198e-04f,  0.0000000000e+00f }, { -2.5877077742e-04f, -5.1472707944e-05f },
	{ -1.1001696231e-04f, -4.5570517881e-05f }, {  6.6159029602e-05f,  4.4206050285e-05f },
	{  1.8948331997e-04f,  1.8948331997e-04f }, {  2.1174839450e-04f,  3.1690386745e-04f },
	{  1.4373864003e-04f,  3.4701577420e-04f }, {  4.7976800158e-05f,  2.4119566214e-04f },
	{  1.7850010134e-21f,  2.9151278795e-05f }, {  3.9977422839e-05f, -2.0098007663e-04f },
	{  1.4373864003e-04f, -3.4701577420e-04f }, {  2.3252332220e-04f, -3.4799574396e-04f },
	{  2.1863459522e-04f, -2.1863459522e-04f }, {  6.2056194319e-05f, -4.1464623394e-05f },
	{ -1.9573451137e-04f,  8.1075889233e-05f }, { -4.4372297073e-04f,  8.8261986569e-05f },
	{ -5.5652443552e-04f,  6.8154586861e-20f }, { -4.6404687472e-04f, -9.2304662425e-05f },
	{ -1.9573451137e-04f, -8.1075889233e-05f }, {  1.2883682237e-04f,  8.6086012482e-05f },
	{  3.6174088546e-04f,  3.6174088546e-04f }, {  4.0837232524e-04f,  6.1117237526e-04f },
	{  2.8207356174e-04f,  6.8098581834e-04f }, {  9.7165906259e-05f,  4.8848599782e-04f },
	{  1.4766828074e-20f,  8.0386867921e-05f }, {  7.5098076010e-05f, -3.7754352331e-04f },
	{  2.8207356174e-04f, -6.8098581834e-04f }, {  4.6580996103e-04f, -6.9713387199e-04f },
	{  4.4212772603e-04f, -4.4212772603e-04f }, {  1.1524044836e-04f, -7.7001205821e-05f },
	{ -4.4136215088e-04f,  1.8281818881e-04f }, { -9.9526783374e-04f,  1.9797108099e-04f },
	{ -1.2632220751e-03f,  3.0940017417e-19f }, { -1.0655584755e-03f, -2.1195275894e-04f },
	{ -4.4136215088e-04f, -1.8281818881e-04f }, {  3.4870278890e-04f,  2.3299575453e-04f },
	{  9.4741662045e-04f,  9.4741662045e-04f }, {  1.0953310298e-03f,  1.6392787312e-03f },
	{  7.8704441197e-04f,  1.9000932936e-03f }, {  2.9063040056e-04f,  1.4610976903e-03f },
	{  1.1602507422e-19f,  3.7896665162e-04f }, {  1.8643098041e-04f, -9.3725183036e-04f },
	{  7.8704441197e-04f, -1.9000932936e-03f }, {  1.3689220250e-03f, -2.0487365913e-03f },
	{  1.3263832192e-03f, -1.3263832192e-03f }, {  2.3975916158e-04f, -1.6020195001e-04f },
	{ -1.7864658936e-03f,  7.3997840184e-04f }, { -4.0136172125e-03f,  7.9835810150e-04f },
	{ -5.3055332974e-03f,  1.9492213111e-18f }, { -4.6575086796e-03f, -9.2643607755e-04f },
	{ -1.7864658936e-03f, -7.3997840184e-04f }, {  2.5328987415e-03f,  1.6924288311e-03f },
	{  6.6319165901e-03f,  6.6319165901e-03f }, {  8.6449647610e-03f,  1.2938104079e-02f },
	{  7.5031564661e-03f,  1.8114222101e-02f }, {  3.7891721988e-03f,  1.9049455038e-02f },
	{  5.6852282253e-18f,  1.3263831846e-02f }, { -3.6723852463e-05f,  1.8462327379e-04f },
	{  7.5031564661e-03f, -1.8114222101e-02f }, {  2.4807723598e-02f, -3.7127382095e-02f },
	{  5.1147919140e-02f, -5.1147919140e-02f }, {  8.2531291606e-02f, -5.5145646011e-02f },
	{  1.1254735140e-01f, -4.6618639361e-02f }, {  1.3419687671e-01f, -2.6693418442e-02f },
	{  1.4208734035e-01f, -6.9602722626e-17f }, {  1.3419687671e-01f,  2.6693418442e-02f },
	{  1.1254735140e-01f,  4.6618639361e-02f }, {  8.2531291606e-02f,  5.5145646011e-02f },
	{  5.1147919140e-02f,  5.1147919140e-02f }, {  2.4807723598e-02f,  3.7127382095e-02f },
	{  7.5031564661e-03f,  1.8114222101e-02f }, { -3.6723852463e-05f, -1.8462327379e-04f },
	{ -7.3095791468e-18f, -1.3263831846e-02f }, {  3.7891721988e-03f, -1.9049455038e-02f },
	{  7.5031564661e-03f, -1.8114222101e-02f }, {  8.6449647610e-03f, -1.2938104079e-02f },
	{  6.6319165901e-03f, -6.6319165901e-03f }, {  2.5328987415e-03f, -1.6924288311e-03f },
	{ -1.7864658936e-03f,  7.3997840184e-04f }, { -4.6575086796e-03f,  9.2643607755e-04f },
	{ -5.3055332974e-03f,  3.2487021852e-18f }, { -4.0136172125e-03f, -7.9835810150e-04f },
	{ -1.7864658936e-03f, -7.3997840184e-04f }, {  2.3975916158e-04f,  1.6020195001e-04f },
	{  1.3263832192e-03f,  1.3263832192e-03f }, {  1.3689220250e-03f,  2.0487365913e-03f },
	{  7.8704441197e-04f,  1.9000932936e-03f }, {  1.8643098041e-04f,  9.3725183036e-04f },
	{ -9.2843516681e-19f, -3.7896665162e-04f }, {  2.9063040056e-04f, -1.4610976903e-03f },
	{  7.8704441197e-04f, -1.9000932936e-03f }, {  1.0953310298e-03f, -1.6392787312e-03f },
	{  9.4741662045e-04f, -9.4741662045e-04f }, {  3.4870278890e-04f, -2.3299575453e-04f },
	{ -4.4136215088e-04f,  1.8281818881e-04f }, { -1.0655584755e-03f,  2.1195275894e-04f },
	{ -1.2632220751e-03f,  9.2820052251e-19f }, { -9.9526783374e-04f, -1.9797108099e-04f },
	{ -4.4136215088e-04f, -1.8281818881e-04f }, {  1.1524044836e-04f,  7.7001205821e-05f },
	{  4.4212772603e-04f,  4.4212772603e-04f }, {  4.6580996103e-04f,  6.9713387199e-04f },
	{  2.8207356174e-04f,  6.8098581834e-04f }, {  7.5098076010e-05f,  3.7754352331e-04f },
	{  7.8806174309e-20f, -8.0386867921e-05f }, {  9.7165906259e-05f, -4.8848599782e-04f },
	{  2.8207356174e-04f, -6.8098581834e-04f }, {  4.0837232524e-04f, -6.1117237526e-04f },
	{  3.6174088546e-04f, -3.6174088546e-04f }, {  1.2883682237e-04f, -8.6086012482e-05f },
	{ -1.9573451137e-04f,  8.1075889233e-05f }, { -4.6404687472e-04f,  9.2304662425e-05f },
	{ -5.5652443552e-04f,  4.7708210803e-19f }, { -4.4372297073e-04f, -8.8261986569e-05f },
	{ -1.9573451137e-04f, -8.1075889233e-05f }, {  6.2056194319e-05f,  4.1464623394e-05f },
	{  2.1863459522e-04f,  2.1863459522e-04f }, {  2.3252332220e-04f,  3.4799574396e-04f },
	{  1.4373864003e-04f,  3.4701577420e-04f }, {  3.9977422839e-05f,  2.0098007663e-04f },
	{ -7.8558088666e-20f, -2.9151278795e-05f }, {  4.7976800158e-05f, -2.4119566214e-04f },
	{  1.4373864003e-04f, -3.4701577420e-04f }, {  2.1174839450e-04f, -3.1690386745e-04f },
	{  1.8948331997e-04f, -1.8948331997e-04f }, {  6.6159029602e-05f, -4.4206050285e-05f },
	{ -1.1001696231e-04f,  4.5570517881e-05f }, { -2.5877077742e-04f,  5.1472707944e-05f },
} };

using decoded_packet = std::pair<std::string, std::string>;

decoded_packet packet_decode(const std::bitset<1024>& data, const size_t data_length);

} /* namespace ais */
} /* namespace baseband */

#endif/*__AIS_BASEBAND_H__*/