/*
   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
   Her Majesty the Queen in Right of Canada (Communications Research
   Center Canada)

   Includes modifications for which no copyright is claimed
   2012, Matthias P. Braendli, matthias.braendli@mpb.li
 */
/*
   This file is part of CRC-DADMOD.

   CRC-DADMOD 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 3 of the
   License, or (at your option) any later version.

   CRC-DADMOD 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 CRC-DADMOD.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#   include "config.h"
#endif

#include "porting.h"

#include "Log.h"
#include "DabModulator.h"
#include "InputMemory.h"
#include "OutputFile.h"
#include "OutputUHD.h"
#include "PcDebug.h"
#include "TimestampDecoder.h"
#include "FIRFilter.h"

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/ini_parser.hpp>
#include <complex>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdexcept>
#include <signal.h>
#include <string.h>

#ifdef HAVE_NETINET_IN_H
#   include <netinet/in.h>
#endif

#ifdef HAVE_DECL__MM_MALLOC
#   include <mm_malloc.h>
#else
#   define memalign(a, b)   malloc(b)
#endif


typedef std::complex<float> complexf;


bool running = true;

void signalHandler(int signalNb)
{
    PDEBUG("signalHandler(%i)\n", signalNb);

    running = false;
}


void printUsage(char* progName, FILE* out = stderr)
{
    fprintf(out, "Welcome to %s %s, compiled at %s, %s\n\n",
            PACKAGE, VERSION, __DATE__, __TIME__);
    fprintf(out, "Usage with configuration file:\n");
    fprintf(out, "\t%s -C config_file.ini\n\n", progName);

    fprintf(out, "Usage with command line options:\n");
    fprintf(out, "\t%s"
            " [input]"
            " (-f filename | -u uhddevice -F frequency) "
            " [-G txgain]"
            " [-o offset]"
            " [-O offsetfile]"
            " [-T filter_taps_file]"
            " [-a amplitude]"
            " [-c clockrate]"
            " [-g gainMode]"
            " [-h]"
            " [-l]"
            " [-m dabMode]"
            " [-r samplingRate]"
            "\n", progName);
    fprintf(out, "Where:\n");
    fprintf(out, "input:         ETI input filename (default: stdin).\n");
    fprintf(out, "-f name:       Use file output with given filename. (use /dev/stdout for standard output)\n");
    fprintf(out, "-u device:     Use UHD output with given device string. (use "" for default device)\n");
    fprintf(out, "-F frequency:  Set the transmit frequency when using UHD output. (mandatory option when using UHD)\n");
    fprintf(out, "-G txgain:     Set the transmit gain for the UHD driver (default: 0)\n");
    fprintf(out, "-o:            (UHD only) Set the timestamp offset added to the timestamp in the ETI. The offset is a double.\n");
    fprintf(out, "-O:            (UHD only) Set the file containing the timestamp offset added to the timestamp in the ETI.\n"
                                 "The file is read every six seconds, and must contain a double value.\n");
    fprintf(out, "                  Specifying either -o or -O has two implications: It enables synchronous transmission,\n"
                 "                  requiring an external REFCLK and PPS signal and frames that do not contain a valid timestamp\n"
                 "                  get muted.\n\n");
    fprintf(out, "-T taps_file:  Enable filtering before the output, using the specified file containing the filter taps.\n");
    fprintf(out, "-a gain:       Apply digital amplitude gain.\n");
    fprintf(out, "-c rate:       Set the DAC clock rate and enable Cic Equalisation.\n");
    fprintf(out, "-g:            Set computation gain mode: "
            "%u FIX, %u MAX, %u VAR\n", GAIN_FIX, GAIN_MAX, GAIN_VAR);
    fprintf(out, "-h:            Print this help.\n");
    fprintf(out, "-l:            Loop file when reach end of file.\n");
    fprintf(out, "-m mode:       Set DAB mode: (0: auto, 1-4: force).\n");
    fprintf(out, "-r rate:       Set output sampling rate (default: 2048000).\n");
}


void printVersion(FILE *out = stderr)
{
    fprintf(out, "Welcome to %s %s, compiled at %s, %s\n\n",
            PACKAGE, VERSION, __DATE__, __TIME__);
    fprintf(out, "CRC-DABMOD is copyright (C) Her Majesty the Queen in Right of Canada,\n"
            "    2009, 2010, 2011, 2012 Communications Research Centre (CRC).\n"
            "\n"
            "    This program is available free of charge and is licensed to you on a\n"
            "    non-exclusive basis; you may not redistribute it.\n"
            "\n"
            "    This program is provided \"AS IS\" in the hope that it will be useful, but\n"
            "    WITHOUT ANY WARRANTY with respect to its accurancy or usefulness; witout\n"
            "    even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR\n"
            "    PURPOSE and NONINFRINGEMENT.\n"
            "\n"
            "    In no event shall CRC be LIABLE for any LOSS, DAMAGE or COST that may be\n"
            "    incurred in connection with the use of this software.\n"
            "\n"
            "CRC-DABMOD makes use of the following open source packages:\n"
            "    Kiss FFT v1.2.9 (Revised BSD) - http://kissfft.sourceforge.net/\n"
           );

}


int main(int argc, char* argv[])
{
    int ret = 0;
    bool loop = false;
    char* inputName = NULL;

    const char* outputName;
    const char* outputDevice;
    int useFileOutput = 0;
    int useUHDOutput = 0;
    double uhdFrequency = 0.0;
    int uhdTxGain = 0;
    bool uhd_mute_no_timestamps = false;
    bool uhd_enable_sync = false;

    FILE* inputFile = NULL;
    uint32_t sync = 0;
    uint32_t nbFrames = 0;
    uint32_t frame = 0;
    uint16_t frameSize = 0;
    size_t outputRate = 2048000;
    size_t clockRate = 0;
    unsigned dabMode = 0;
    float amplitude = 1.0f;
    GainMode gainMode = GAIN_VAR;
    Buffer data;

    const char* filterTapsFilename = NULL;

    // Two configuration sources exist: command line and (new) INI file
    bool use_configuration_cmdline = false;
    bool use_configuration_file = false;
    std::string configuration_file;

    // To handle the timestamp offset of the modulator
    struct modulator_offset_config modconf;
    modconf.use_offset_file = false;
    modconf.use_offset_fixed = false;
    modconf.delay_calculation_pipeline_stages = 0;

    Flowgraph* flowgraph = NULL;
    DabModulator* modulator = NULL;
    InputMemory* input = NULL;
    ModOutput* output = NULL;

    Logger logger;

    signal(SIGINT, signalHandler);

    // Set timezone to UTC
    setenv("TZ", "", 1);
    tzset();

    while (true) {
        int c = getopt(argc, argv, "a:C:c:f:F:g:G:hlm:o:O:r:T:u:V");
        if (c == -1) {
            break;
        }

        if (c != 'C') {
            use_configuration_cmdline = true;
        }
            
        switch (c) {
        case 'C':
            use_configuration_file = true;
            configuration_file = optarg;
            break;

        case 'a':
            amplitude = strtof(optarg, NULL);
            break;
        case 'c':
            clockRate = strtol(optarg, NULL, 0);
            break;
        case 'f':
            if (useUHDOutput) {
                fprintf(stderr, "Options -u and -f are mutually exclusive\n");
                goto END_MAIN;
            }
            outputName = optarg;
            useFileOutput = 1;
            break;
        case 'F':
            uhdFrequency = strtof(optarg, NULL);
            break;
        case 'g':
            gainMode = (GainMode)strtol(optarg, NULL, 0);
            break;
        case 'G':
            uhdTxGain = (int)strtol(optarg, NULL, 10);
            break;
        case 'l':
            loop = true;
            break;
        case 'o':
            if (modconf.use_offset_file)
            {
                fprintf(stderr, "Options -o and -O are mutually exclusive\n");
                goto END_MAIN;
            }
            modconf.use_offset_fixed = true;
            modconf.offset_fixed = strtod(optarg, NULL);
            uhd_enable_sync = true;
            break;
        case 'O':
            if (modconf.use_offset_fixed)
            {
                fprintf(stderr, "Options -o and -O are mutually exclusive\n");
                goto END_MAIN;
            }
            modconf.use_offset_file = true;
            modconf.offset_filename = optarg;
            uhd_enable_sync = true;
            break;
        case 'm':
            dabMode = strtol(optarg, NULL, 0);
            break;
        case 'r':
            outputRate = strtol(optarg, NULL, 0);
            break;
        case 'T':
            filterTapsFilename = optarg;
            break;
        case 'u':
            if (useFileOutput) {
                fprintf(stderr, "Options -u and -f are mutually exclusive\n");
                goto END_MAIN;
            }
            outputDevice = optarg;
            useUHDOutput = 1;
            break;
        case 'V':
            printVersion();
            goto END_MAIN;
            break;
        case '?':
        case 'h':
            printUsage(argv[0]);
            goto END_MAIN;
            break;
        default:
            fprintf(stderr, "Option '%c' not coded yet!\n", c);
            ret = -1;
            goto END_MAIN;
        }
    }

    if (use_configuration_file && use_configuration_cmdline) {
        fprintf(stderr, "Warning: configuration file and command line parameters are defined:\n\t"
                        "Command line parameters override settings in the configuration file !\n");
    }

    if (use_configuration_file) {
        // First read parameters from the file
        using boost::property_tree::ptree;
        ptree pt;

        read_ini(configuration_file, pt);

        // log parameters:
        if (pt.get("log.syslog", 0) == 1) {
            LogToSyslog* log_syslog = new LogToSyslog();
            logger.register_backend(log_syslog);
        }

        if (pt.get("log.filelog", 0) == 1) {
            try {
                std::string logfilename = pt.get<std::string>("fileoutput.filename");
                LogToFile* log_file = new LogToFile(logfilename);
                logger.register_backend(log_file);
            }
            catch (std::exception &e) {
                std::cerr << "Error: " << e.what() << "\n";
                std::cerr << "       Configuration enables file log, but does not specify log filename\n";
                goto END_MAIN;
            }
        }


        // modulator parameters:
        gainMode = (GainMode)pt.get("modulator.gainmode", 0);
        dabMode = pt.get("modulator.mode", dabMode);
        clockRate = pt.get("modulator.dac_clk_rate", (size_t)0);
        amplitude = pt.get("modulator.digital_gain", amplitude);
        outputRate = pt.get("modulator.rate", outputRate);
        
        // FIR Filter parameters:
        if (pt.get("firfilter.enabled", 0) == 1) {
            try {
                filterTapsFilename = pt.get<std::string>("firfilter.enabled").c_str();
            }
            catch (std::exception &e) {
                std::cerr << "Error: " << e.what() << "\n";
                std::cerr << "       Configuration enables firfilter, but does not specify filter taps file\n";
                goto END_MAIN;
            }
        }

        // Output options
        std::string output_selected;
        try {
             output_selected = pt.get<std::string>("output.output");
        }
        catch (std::exception &e) {
            std::cerr << "Error: " << e.what() << "\n";
            std::cerr << "       Configuration does not specify output\n";
            goto END_MAIN;
        }

        if (output_selected == "file") {
            try {
                outputName = pt.get<std::string>("fileoutput.filename").c_str();
            }
            catch (std::exception &e) {
                std::cerr << "Error: " << e.what() << "\n";
                std::cerr << "       Configuration does not specify file name for file output\n";
                goto END_MAIN;
            }
            useFileOutput = 1;
        }
        else if (output_selected == "uhd") {
            outputDevice = pt.get("uhdoutput.device", "").c_str();
            uhdTxGain    = pt.get("uhdoutput.txgain", 0);
            try {
                uhdFrequency = pt.get<double>("uhdoutput.frequency");
            }
            catch (std::exception &e) {
                std::cerr << "Error: " << e.what() << "\n";
                std::cerr << "       UHD output enabled, but no frequency defined.\n";
                goto END_MAIN;
            }
            useUHDOutput = 1;
        }
        else {
            std::cerr << "Error: Invalid output defined.\n";
            goto END_MAIN;
        }

        uhd_enable_sync = (pt.get("delaymanagement.synchronous", 0) == 1);
        if (uhd_enable_sync) {
            try {
                std::string delay_mgmt = pt.get<std::string>("delaymanagement.management");
                if (delay_mgmt == "fixed") {
                    modconf.offset_fixed = pt.get<double>("delaymanagement.fixedoffset");
                    modconf.use_offset_fixed = true;
                }
                else if (delay_mgmt == "dynamic") {
                    modconf.offset_filename = pt.get<std::string>("delaymanagement.dynamicoffsetfile").c_str();
                    modconf.use_offset_file = true;
                }
                else {
                    throw std::runtime_error("invalid management value");
                }
            }
            catch (std::exception &e) {
                std::cerr << "Error: " << e.what() << "\n";
                std::cerr << "       Synchronised transmission enabled, but delay management specification is incomplete.\n";
                goto END_MAIN;
            }
        }
    }

    logger(info, "starting up");

    // When using offset, enable frame muting
    uhd_mute_no_timestamps = (modconf.use_offset_file || modconf.use_offset_fixed);

    if (!(modconf.use_offset_file || modconf.use_offset_fixed)) {
        fprintf(stderr, "No Modulator offset defined, setting to 0\n");
        logger(debug, "No Modulator offset defined, setting to 0");
        modconf.use_offset_fixed = true;
        modconf.offset_fixed = 0;
    }

    // When using the FIRFilter, increase the modulator offset pipelining delay
    // by the correct amount
    if (filterTapsFilename != NULL) {
        modconf.delay_calculation_pipeline_stages += FIRFILTER_PIPELINE_DELAY;
    }


    // Setting ETI input filename
    if (inputName != NULL && optind < argc) {
        inputName = argv[optind++];
    } else {
        inputName = (char*)"/dev/stdin";
    }
    // Checking unused arguments
    if (optind != argc) {
        fprintf(stderr, "Invalid arguments:");
        while (optind != argc) {
            fprintf(stderr, " %s", argv[optind++]);
        }
        fprintf(stderr, "\n");
        printUsage(argv[0]);
        ret = -1;
        logger(error, "Received invalid command line arguments");
        goto END_MAIN;
    }

    if (!useFileOutput && !useUHDOutput) {
        logger(error, "Output not specified");
        fprintf(stderr, "Must specify output !");
        goto END_MAIN;
    }

    // Print settings
    fprintf(stderr, "Input\n");
    fprintf(stderr, "  Name: %s\n", inputName);
    fprintf(stderr, "Output\n");
    if (useUHDOutput) {
        fprintf(stderr, " UHD, Device: %s\n", outputDevice);
    }
    else if (useFileOutput) {
        fprintf(stderr, "  Name: %s\n", outputName);
    }
    fprintf(stderr, "  Sampling rate: ");
    if (outputRate > 1000) {
        if (outputRate > 1000000) {
            fprintf(stderr, "%.3g MHz\n", outputRate / 1000000.0f);
        } else {
            fprintf(stderr, "%.3g kHz\n", outputRate / 1000.0f);
        }
    } else {
        fprintf(stderr, "%zu Hz\n", outputRate);
    }

    // Opening ETI input file
    inputFile = fopen(inputName, "r");
    if (inputFile == NULL) {
        fprintf(stderr, "Unable to open input file!\n");
        logger(error, "Unable to open input file!");
        perror(inputName);
        ret = -1;
        goto END_MAIN;
    }

    if (useFileOutput) {
        // Opening COFDM output file
        if (outputName != NULL) {
            fprintf(stderr, "Using file output\n");
            output = new OutputFile(outputName);
        }
    }
    else if (useUHDOutput) {
        fprintf(stderr, "Using UHD output\n");
        amplitude /= 32000.0f;
        try {
            output = new OutputUHD(outputDevice, outputRate,
                               uhdFrequency, uhdTxGain,
                               uhd_enable_sync, uhd_mute_no_timestamps,
                               logger);
        }
        catch (std::exception& e) {
            logger(error, "UHD initialisation failed");
            goto END_MAIN;
        }
        
    }

    flowgraph = new Flowgraph();
    data.setLength(6144);
    input = new InputMemory(&data);
    modulator = new DabModulator(modconf, outputRate, clockRate,
            dabMode, gainMode, amplitude, filterTapsFilename);
    flowgraph->connect(input, modulator);
    flowgraph->connect(modulator, output);

    if (useUHDOutput) {
        ((OutputUHD*)output)->setETIReader(modulator->getEtiReader());
    }

    try {
        while (running) {
            enum EtiStreamType {
                ETI_STREAM_TYPE_NONE = 0,
                ETI_STREAM_TYPE_RAW,
                ETI_STREAM_TYPE_STREAMED,
                ETI_STREAM_TYPE_FRAMED,
            };
            EtiStreamType streamType = ETI_STREAM_TYPE_NONE;

            struct stat inputFileStat;
            fstat(fileno(inputFile), &inputFileStat);
            size_t inputFileLength = inputFileStat.st_size;

            if (fread(&sync, sizeof(sync), 1, inputFile) != 1) {
                fprintf(stderr, "Unable to read sync in input file!\n");
                logger(error, "Unable to read sync in input file!");
                perror(inputName);
                ret = -1;
                goto END_MAIN;
            }
            if ((sync == 0x49c5f8ff) || (sync == 0xb63a07ff)) {
                streamType = ETI_STREAM_TYPE_RAW;
                if (inputFileLength > 0) {
                    nbFrames = inputFileLength / 6144;
                } else {
                    nbFrames = (uint32_t)-1;
                }
                if (fseek(inputFile, -sizeof(sync), SEEK_CUR) != 0) {
                    if (fread(data.getData(), 6144 - sizeof(sync), 1, inputFile)
                            != 1) {
                        fprintf(stderr, "Unable to seek in input file!\n");
                        logger(error, "Unable to seek in input file!");
                        ret = -1;
                        goto END_MAIN;
                    }
                }
                goto START;
            }

            nbFrames = sync;
            if (fread(&frameSize, sizeof(frameSize), 1, inputFile) != 1) {
                fprintf(stderr, "Unable to read frame size in input file!\n");
                logger(error, "Unable to read frame size in input file!");
                perror(inputName);
                ret = -1;
                goto END_MAIN;
            }
            sync >>= 16;
            sync &= 0xffff;
            sync |= ((uint32_t)frameSize) << 16;

            if ((sync == 0x49c5f8ff) || (sync == 0xb63a07ff)) {
                streamType = ETI_STREAM_TYPE_STREAMED;
                frameSize = nbFrames & 0xffff;
                if (inputFileLength > 0) {
                    nbFrames = inputFileLength / (frameSize + 2);
                } else {
                    nbFrames = (uint32_t)-1;
                }
                if (fseek(inputFile, -6, SEEK_CUR) != 0) {
                    if (fread(data.getData(), frameSize - 4, 1, inputFile)
                            != 1) {
                        fprintf(stderr, "Unable to seek in input file!\n");
                        logger(error, "Unable to seek in input file!");
                        ret = -1;
                        goto END_MAIN;
                    }
                }
                goto START;
            }

            if (fread(&sync, sizeof(sync), 1, inputFile) != 1) {
                fprintf(stderr, "Unable to read nb frame in input file!\n");
                logger(error, "Unable to read nb frame in input file!");
                perror(inputName);
                ret = -1;
                goto END_MAIN;
            }
            if ((sync == 0x49c5f8ff) || (sync == 0xb63a07ff)) {
                streamType = ETI_STREAM_TYPE_FRAMED;
                if (fseek(inputFile, -6, SEEK_CUR) != 0) {
                    if (fread(data.getData(), frameSize - 4, 1, inputFile)
                            != 1) {
                        fprintf(stderr, "Unable to seek in input file!\n");
                        logger(error, "Unable to seek in input file!");
                        ret = -1;
                        goto END_MAIN;
                    }
                }
                goto START;
            }

            for (size_t i = 10; i < 6144 + 10; ++i) {
                sync >>= 8;
                sync &= 0xffffff;
                if (fread((uint8_t*)&sync + 3, 1, 1, inputFile) != 1) {
                    fprintf(stderr, "Unable to read from input file!\n");
                    logger(error, "Unable to read from input file!");
                    ret = 1;
                    goto END_MAIN;
                }
                if ((sync == 0x49c5f8ff) || (sync == 0xb63a07ff)) {
                    streamType = ETI_STREAM_TYPE_RAW;
                    if (inputFileLength > 0) {
                        nbFrames = (inputFileLength - i) / 6144;
                    } else {
                        nbFrames = (uint32_t)-1;
                    }
                    if (fseek(inputFile, -sizeof(sync), SEEK_CUR) != 0) {
                        if (fread(data.getData(), 6144 - sizeof(sync), 1, inputFile)
                                != 1) {
                            fprintf(stderr, "Unable to seek in input file!\n");
                            logger(error, "Unable to seek in input file!");
                            ret = -1;
                            goto END_MAIN;
                        }
                    }
                    goto START;
                }
            }

            fprintf(stderr, "Bad input file format!\n");
            logger(error, "Bad input file format!");
            ret = -1;
            goto END_MAIN;

START:
            fprintf(stderr, "Input file format: ");
            switch (streamType) {
            case ETI_STREAM_TYPE_RAW:
                fprintf(stderr, "raw");
                break;
            case ETI_STREAM_TYPE_STREAMED:
                fprintf(stderr, "streamed");
                break;
            case ETI_STREAM_TYPE_FRAMED:
                fprintf(stderr, "framed");
                break;
            default:
                fprintf(stderr, "unknown\n");
                logger(error, "Input file format unknown!");
                ret = -1;
                goto END_MAIN;
            }
            fprintf(stderr, "\n");
            fprintf(stderr, "Input file length: %zu\n", inputFileLength);
            fprintf(stderr, "Input file nb frames: %u\n", nbFrames);

            for (frame = 0; frame < nbFrames; ++frame) {
                if (!running) {
                    break;
                }

                PDEBUG("*****************************************\n");
                PDEBUG("* Reading frame %u\n", frame);
                PDEBUG("*****************************************\n");
                if (streamType == ETI_STREAM_TYPE_RAW) {
                    frameSize = 6144;
                } else {
                    if (fread(&frameSize, sizeof(frameSize), 1, inputFile)
                            != 1) {
                        PDEBUG("End of file!\n");
                        logger(error, "Reached end of file!");
                        goto END_MAIN;
                    }
                }
                PDEBUG("Frame size: %i\n", frameSize);

                if (fread(data.getData(), frameSize, 1, inputFile) != 1) {
                    fprintf(stderr,
                            "Unable to read %i data bytes in input file!\n",
                            frameSize);
                    perror(inputName);
                    ret = -1;
                    logger(error, "Unable to read from input file!");
                    goto END_MAIN;
                }
                memset(&((uint8_t*)data.getData())[frameSize], 0x55, 6144 - frameSize);

                ////////////////////////////////////////////////////////////////
                // Proccessing data
                ////////////////////////////////////////////////////////////////
                flowgraph->run();
            }
            fprintf(stderr, "End of file reached.\n");
            if (!loop) {
                running = false;
            } else {
                fprintf(stderr, "Rewinding file.\n");
                rewind(inputFile);
            }
        }
    } catch (std::exception& e) {
        fprintf(stderr, "EXCEPTION: %s\n", e.what());
        ret = -1;
        goto END_MAIN;
    }

END_MAIN:
    ////////////////////////////////////////////////////////////////////////
    // Cleaning things
    ////////////////////////////////////////////////////////////////////////
    fprintf(stderr, "\n\n");
    fprintf(stderr, "%u DAB frames encoded\n", frame);
    fprintf(stderr, "%f seconds encoded\n", (float)frame * 0.024f);

    fprintf(stderr, "\nCleaning flowgraph...\n");
    delete flowgraph;

    // Cif
    fprintf(stderr, "\nCleaning buffers...\n");

    fprintf(stderr, "\nClosing input file...\n");
    if (inputFile != NULL) {
        fclose(inputFile);
    }

    logger(info, "Terminating");

    return ret;
}