/*
 * SpanDSP - a series of DSP components for telephony
 *
 * t31_tests.c - Tests for the T.31 modem.
 *
 * Written by Steve Underwood <steveu@coppice.org>
 *
 * Copyright (C) 2004 Steve Underwood
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 *
 * 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; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: t31_tests.c,v 1.42 2006/11/19 14:07:27 steveu Exp $
 */

/*! \file */

/*! \page t31_tests_page T.31 tests
\section t31_tests_page_sec_1 What does it do?
*/

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

#define _GNU_SOURCE

#include <inttypes.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#if defined(HAVE_TGMATH_H)
#include <tgmath.h>
#endif
#if defined(HAVE_MATH_H)
#include <math.h>
#endif
#include <assert.h>
#include <audiofile.h>
#include <tiffio.h>

#include "spandsp.h"
#include "spandsp/t30_fcf.h"

#define INPUT_FILE_NAME         "../itutests/fax/itu1.tif"
#define OUTPUT_FILE_NAME        "t31.tif"
#define OUTPUT_WAVE_FILE_NAME   "t31_tests.wav"

#define DLE 0x10
#define ETX 0x03
#define SUB 0x1A

#define MANUFACTURER            "www.soft-switch.org"

#define SAMPLES_PER_CHUNK 160

struct command_response_s
{
    const char *command;
    int len_command;
    const char *response;
    int len_response;
};

#define EXCHANGE(a,b) {a, sizeof(a) - 1, b, sizeof(b) - 1}
#define RESPONSE(b) {"", 0, b, sizeof(b) - 1}
#define FAST_RESPONSE(b) {NULL, -1, b, sizeof(b) - 1}
#define FAST_SEND(b) {(const char *) 1, -2, b, sizeof(b) - 1}

static const struct command_response_s fax_send_test_seq[] =
{
    EXCHANGE("ATE0\r", "ATE0\r\r\nOK\r\n"),
    EXCHANGE("AT+FCLASS=1\r", "\r\nOK\r\n"),
    EXCHANGE("ATD123456789\r", "\r\nCONNECT\r\n"),
    //<NSF frame>         AT+FRH=3 is implied when dialing in the AT+FCLASS=1 state
    //RESPONSE("\xFF\x03\x10\x03"),
    //RESPONSE("\r\nOK\r\n"),
    //EXCHANGE("AT+FRH=3\r", "\r\nCONNECT\r\n"),
    //<CSI frame data>
    RESPONSE("\xFF\x03\x40\x31\x31\x31\x31\x31\x31\x31\x31\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x1e\x46\x10\x03"),
    RESPONSE("\r\nOK\r\n"),
    EXCHANGE("AT+FRH=3\r", "\r\nCONNECT\r\n"),
    //<DIS frame data>
    RESPONSE("\xFF\x13\x80\x00\xCE\xF8\x80\x80\x89\x80\x80\x80\x98\x80\x80\x80\x80\x80\x00\xFA\x72\x10\x03"),
    RESPONSE("\r\nOK\r\n"),
    //EXCHANGE("AT+FRH=3\r", "\r\nNO CARRIER\r\n"),
    EXCHANGE("AT+FTH=3\r", "\r\nCONNECT\r\n"),
    //<TSI frame data>
    EXCHANGE("\xFF\x03\x43\x32\x32\x32\x32\x32\x32\x32\x32\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x10\x03", "\r\nCONNECT\r\n"),
    //<DCS frame data>
    EXCHANGE("\xFF\x13\x83\x01\xC6\x80\x80\x80\x80\x01\xFD\x13\x10\x03", "\r\nOK\r\n"),
    //Do a wait for timed silence at this point, or there won't be one in the tests
    EXCHANGE("AT+FRS=7\r", "\r\nOK\r\n"),
    //EXCHANGE("AT+FTS=8;+FTM=96\r", "\r\nCONNECT\r\n"),
    EXCHANGE("AT+FTS=8\r", "\r\nOK\r\n"),
    EXCHANGE("AT+FTM=96\r", "\r\nCONNECT\r\n"),
    //<TCF data pattern>
    FAST_SEND("\r\nOK\r\n"),
    EXCHANGE("AT+FRH=3\r", "\r\nCONNECT\r\n"),
    //<CFR frame data>
    RESPONSE("\xFF\x13\x84\xEA\x7D\x10\x03"),
    RESPONSE("\r\nOK\r\n"),
    EXCHANGE("AT+FTM=96\r", "\r\nCONNECT\r\n"),
    //<page image data>
    FAST_SEND("\r\nOK\r\n"),
    //EXCHANGE("AT+FTS=8;+FTH=3\r", "\r\nCONNECT\r\n"),
    EXCHANGE("AT+FTS=8\r", "\r\nOK\r\n"),
    EXCHANGE("AT+FTH=3\r", "\r\nCONNECT\r\n"),
    //<EOP frame data>
    EXCHANGE("\xFF\x13\x2E\x10\x03", "\r\nOK\r\n"),
    EXCHANGE("AT+FRH=3\r", "\r\nCONNECT\r\n"),
    //<MCF frame data>
    EXCHANGE("\xFF\x13\x8C\x10\x03", "\r\nOK\r\n"),
    EXCHANGE("AT+FTH=3\r", "\r\nCONNECT\r\n"),
    // <DCN frame data>
    EXCHANGE("\xFF\x13\xFB\x10\x03", "\r\nOK\r\n"),
    EXCHANGE("ATH0\r", "\r\nOK\r\n")
};

static const struct command_response_s fax_receive_test_seq[] =
{
    EXCHANGE("ATE0\r", "ATE0\r\r\nOK\r\n"),
    EXCHANGE("AT+FCLASS=1\r", "\r\nOK\r\n"),
    RESPONSE("\r\nRING\r\n"),
    EXCHANGE("ATA\r", "\r\nCONNECT\r\n"),
    //<CSI frame data>
    EXCHANGE("\xFF\x03\x40\x32\x32\x32\x32\x32\x32\x32\x32\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x10\x03", "\r\nCONNECT\r\n"),
    //<DIS frame data>
    EXCHANGE("\xFF\x13\x80\x01\xCE\xF4\x80\x80\x81\x80\x80\x80\x18\x10\x03", "\r\nOK\r\n"),
    EXCHANGE("AT+FRH=3\r", "\r\nCONNECT\r\n"),
    //<TSI frame data>
    RESPONSE("\xFF\x03\x43\x31\x31\x31\x31\x31\x31\x31\x31\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\xAA\x1F\x10\x03"),
    RESPONSE("\r\nOK\r\n"),
    EXCHANGE("AT+FRH=3\r", "\r\nCONNECT\r\n"),
    //<DCS frame data>
    RESPONSE("\xFF\x13\x83\x00\xC6\xF0\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x80\x00\xE4\x7E\x10\x03"),
    RESPONSE("\r\nOK\r\n"),
    EXCHANGE("AT+FRM=96\r", "\r\nCONNECT\r\n"),
    //<TCF data>
    FAST_RESPONSE(NULL),
    RESPONSE("\r\nNO CARRIER\r\n"),
    EXCHANGE("AT+FTH=3\r", "\r\nCONNECT\r\n"),
    //<CFR frame data>
    EXCHANGE("\xFF\x13\x84\x10\x03", "\r\nOK\r\n"),
    EXCHANGE("AT+FRM=96\r", "\r\nCONNECT\r\n"),
    //<page image data>
    FAST_RESPONSE(NULL),
    RESPONSE("\r\nNO CARRIER\r\n"),
    EXCHANGE("AT+FRH=3\r", "\r\nCONNECT\r\n"),
    //<EOP frame data>
    RESPONSE("\xFF\x13\x2F\x33\x66\x10\x03"),
    RESPONSE("\r\nOK\r\n"),
    EXCHANGE("AT+FTH=3\r", "\r\nCONNECT\r\n"),
    //<MCF frame data>
    EXCHANGE("\xFF\x13\x8C\x10\x03", "\r\nOK\r\n"),
    EXCHANGE("AT+FRH=3\r", "\r\nCONNECT\r\n"),
    //<DCN frame data>
    RESPONSE("\xFF\x13\xfb\x9a\xf6\x10\x03"),
    RESPONSE("\r\nOK\r\n"),
    EXCHANGE("ATH0\r", "\r\nOK\r\n")
};

char *decode_test_file = NULL;
int countdown = 0;
int command_response_test_step = -1;
char response_buf[1000];
int response_buf_ptr = 0;
int answered = FALSE;
int kick = FALSE;
int dled = FALSE;
int done = FALSE;

static const struct command_response_s *fax_test_seq;

int test_seq_ptr = 0;

t31_state_t t31_state;

static void phase_b_handler(t30_state_t *s, void *user_data, int result)
{
    int i;
    
    i = (intptr_t) user_data;
    printf("Phase B handler on channel %d - (0x%X) %s\n", i, result, t30_frametype(result));
}
/*- End of function --------------------------------------------------------*/

static void phase_d_handler(t30_state_t *s, void *user_data, int result)
{
    int i;
    t30_stats_t t;
    char ident[21];

    i = (intptr_t) user_data;
    printf("Phase D handler on channel %d - (0x%X) %s\n", i, result, t30_frametype(result));
    t30_get_transfer_statistics(s, &t);
    printf("Phase D: bit rate %d\n", t.bit_rate);
    printf("Phase D: ECM %s\n", (t.error_correcting_mode)  ?  "on"  :  "off");
    printf("Phase D: pages transferred %d\n", t.pages_transferred);
    printf("Phase D: image size %d x %d\n", t.width, t.length);
    printf("Phase D: image resolution %d x %d\n", t.x_resolution, t.y_resolution);
    printf("Phase D: bad rows %d\n", t.bad_rows);
    printf("Phase D: longest bad row run %d\n", t.longest_bad_row_run);
    printf("Phase D: coding method %d\n", t.encoding);
    printf("Phase D: image size %d\n", t.image_size);
    t30_get_local_ident(s, ident);
    printf("Phase D: local ident '%s'\n", ident);
    t30_get_far_ident(s, ident);
    printf("Phase D: remote ident '%s'\n", ident);
}
/*- End of function --------------------------------------------------------*/

static void phase_e_handler(t30_state_t *s, void *user_data, int result)
{
    int i;
    
    i = (intptr_t) user_data;
    printf("Phase E handler on channel %d\n", i);
    //exit(0);
}
/*- End of function --------------------------------------------------------*/

static int modem_call_control(t31_state_t *s, void *user_data, int op, const char *num)
{
    switch (op)
    {
    case AT_MODEM_CONTROL_ANSWER:
        printf("\nModem control - Answering\n");
        answered = TRUE;
        break;
    case AT_MODEM_CONTROL_CALL:
        printf("\nModem control - Dialing '%s'\n", num);
        t31_call_event(&t31_state, AT_CALL_EVENT_CONNECTED);
        break;
    case AT_MODEM_CONTROL_HANGUP:
        printf("\nModem control - Hanging up\n");
        done = TRUE;
        break;
    case AT_MODEM_CONTROL_OFFHOOK:
        printf("\nModem control - Going off hook\n");
        break;
    case AT_MODEM_CONTROL_DTR:
        printf("\nModem control - DTR %d\n", (int) (intptr_t) num);
        break;
    case AT_MODEM_CONTROL_RTS:
        printf("\nModem control - RTS %d\n", (int) (intptr_t) num);
        break;
    case AT_MODEM_CONTROL_CTS:
        printf("\nModem control - CTS %d\n", (int) (intptr_t) num);
        break;
    case AT_MODEM_CONTROL_CAR:
        printf("\nModem control - CAR %d\n", (int) (intptr_t) num);
        break;
    case AT_MODEM_CONTROL_RNG:
        printf("\nModem control - RNG %d\n", (int) (intptr_t) num);
        break;
    case AT_MODEM_CONTROL_DSR:
        printf("\nModem control - DSR %d\n", (int) (intptr_t) num);
        break;
    default:
        printf("\nModem control - operation %d\n", op);
        break;
    }
    /*endswitch*/
    return 0;
}
/*- End of function --------------------------------------------------------*/

static int at_tx_handler(at_state_t *s, void *user_data, const uint8_t *buf, size_t len)
{
    size_t i;

    i = 0;
    if (fax_test_seq[test_seq_ptr].command == NULL)
    {
        /* TCF or non-ECM image data expected */
        for (  ;  i < len;  i++)
        {
            if (dled)
            {
                if (buf[i] == ETX)
                {
                    printf("\nFast data ended\n");
                    response_buf_ptr = 0;
                    response_buf[response_buf_ptr] = '\0';
                    test_seq_ptr++;
                    if (fax_test_seq[test_seq_ptr].command)
                        kick = TRUE;
                    break;
                }
                dled = FALSE;
            }
            else
            {
                if (buf[i] == DLE)
                    dled = TRUE;
            }
        }
        i++;
        if (i >= len)
            return 0;
    }
    for (  ;  i < len;  i++)
    {
        response_buf[response_buf_ptr++] = buf[i];
        putchar(buf[i]);
    }
    response_buf[response_buf_ptr] = '\0';
    printf("Expected ");
    for (i = 0;  i < response_buf_ptr;  i++)
        printf("%02x ", fax_test_seq[test_seq_ptr].response[i] & 0xFF);
    printf("\n");
    printf("Response ");
    for (i = 0;  i < response_buf_ptr;  i++)
        printf("%02x ", response_buf[i] & 0xFF);
    printf("\n");
printf("Match %d against %d\n", response_buf_ptr, fax_test_seq[test_seq_ptr].len_response);
    if (response_buf_ptr >= fax_test_seq[test_seq_ptr].len_response
        &&
        memcmp(fax_test_seq[test_seq_ptr].response, response_buf, fax_test_seq[test_seq_ptr].len_response) == 0)
    {
        printf("\nMatched\n");
        test_seq_ptr++;
        response_buf_ptr = 0;
        response_buf[response_buf_ptr] = '\0';
        if (fax_test_seq[test_seq_ptr].command)
            kick = TRUE;
        else
            dled = FALSE;
    }
    return 0;
}
/*- End of function --------------------------------------------------------*/

int main(int argc, char *argv[])
{
    int i;
    int k;
    int outframes;
    fax_state_t fax_state;
    int16_t t30_amp[SAMPLES_PER_CHUNK];
    int16_t t31_amp[SAMPLES_PER_CHUNK];
    int16_t silence[SAMPLES_PER_CHUNK];
    int16_t out_amp[2*SAMPLES_PER_CHUNK];
    int t30_len;
    int t31_len;
    AFfilesetup filesetup;
    AFfilehandle wave_handle;
    AFfilehandle in_handle;
    int log_audio;
    int test_sending;
    int fast_send;
    int fast_blocks;
    uint8_t fast_buf[1000];
    
    decode_test_file = NULL;
    log_audio = FALSE;
    test_sending = FALSE;
    for (i = 1;  i < argc;  i++)
    {
        if (strcmp(argv[i], "-d") == 0)
        {
            decode_test_file = argv[++i];
            continue;
        }
        if (strcmp(argv[i], "-l") == 0)
        {
            log_audio = TRUE;
            continue;
        }
        if (strcmp(argv[i], "-r") == 0)
        {
            test_sending = FALSE;
            continue;
        }
        if (strcmp(argv[i], "-s") == 0)
        {
            test_sending = TRUE;
            continue;
        }
    }

    filesetup = AF_NULL_FILESETUP;
    wave_handle = AF_NULL_FILEHANDLE;
    if (log_audio)
    {
        if ((filesetup = afNewFileSetup()) == AF_NULL_FILESETUP)
        {
            fprintf(stderr, "    Failed to create file setup\n");
            exit(2);
        }
        afInitSampleFormat(filesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
        afInitRate(filesetup, AF_DEFAULT_TRACK, (float) SAMPLE_RATE);
        afInitFileFormat(filesetup, AF_FILE_WAVE);
        afInitChannels(filesetup, AF_DEFAULT_TRACK, 2);
        if ((wave_handle = afOpenFile(OUTPUT_WAVE_FILE_NAME, "w", filesetup)) == AF_NULL_FILEHANDLE)
        {
            fprintf(stderr, "    Cannot create wave file '%s'\n", OUTPUT_WAVE_FILE_NAME);
            exit(2);
        }
    }

    memset(silence, 0, sizeof(silence));
 
    in_handle = NULL;
    if (decode_test_file)
    {
        if ((in_handle = afOpenFile(decode_test_file, "r", NULL)) == AF_NULL_FILEHANDLE)
        {
            fprintf(stderr, "    Cannot create wave file '%s'\n", decode_test_file);
            exit(2);
        }
    }

    if (test_sending)
    {
        fax_init(&fax_state, FALSE);
        t30_set_rx_file(&fax_state.t30_state, OUTPUT_FILE_NAME, -1);
        fax_test_seq = fax_send_test_seq;
        countdown = 0;
    }
    else
    {
        fax_init(&fax_state, TRUE);
        t30_set_tx_file(&fax_state.t30_state, INPUT_FILE_NAME, -1, -1);
        fax_test_seq = fax_receive_test_seq;
        countdown = 250;
    }
    
    t30_set_local_ident(&fax_state.t30_state, "11111111");
    t30_set_phase_b_handler(&fax_state.t30_state, phase_b_handler, (void *) 0);
    t30_set_phase_d_handler(&fax_state.t30_state, phase_d_handler, (void *) 0);
    t30_set_phase_e_handler(&fax_state.t30_state, phase_e_handler, (void *) 0);
    memset(t30_amp, 0, sizeof(t30_amp));
    
    span_log_set_level(&fax_state.t30_state.logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_SHOW_TAG | SPAN_LOG_FLOW);
    span_log_set_tag(&fax_state.t30_state.logging, "YYY");
    span_log_set_level(&fax_state.logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_SHOW_TAG | SPAN_LOG_FLOW);
    span_log_set_tag(&fax_state.logging, "YYY");

    if (t31_init(&t31_state, at_tx_handler, NULL, modem_call_control, NULL, NULL, NULL) == NULL)
    {
        fprintf(stderr, "    Cannot start the FAX modem\n");
        exit(2);
    }

    span_log_set_level(&t31_state.logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_SHOW_TAG | SPAN_LOG_FLOW);
    span_log_set_tag(&t31_state.logging, "XXX");

    fast_send = FALSE;
    fast_blocks = 0;
    kick = TRUE;
    while (!done)
    {
        if (kick)
        {
            kick = FALSE;
            if (fax_test_seq[test_seq_ptr].command > (const char *) 1)
            {
                if (fax_test_seq[test_seq_ptr].command[0])
                {
                    printf("%s\n", fax_test_seq[test_seq_ptr].command);
                    t31_at_rx(&t31_state, fax_test_seq[test_seq_ptr].command, fax_test_seq[test_seq_ptr].len_command);
                }
            }
            else
            {
                printf("Fast send\n");
                fast_send = TRUE;
                fast_blocks = 100;
            }
        }
        if (fast_send)
        {
            /* Send fast modem data */
            memset(fast_buf, 0, 36);
            if (fast_blocks == 1)
            {
                /* Insert EOLs */
                fast_buf[35] = ETX;
                fast_buf[34] = DLE;
                fast_buf[31] =
                fast_buf[28] =
                fast_buf[25] =
                fast_buf[22] =
                fast_buf[19] =
                fast_buf[16] = 1;
            }
            t31_at_rx(&t31_state, (char *) fast_buf, 36);
            if (--fast_blocks == 0)
                fast_send = FALSE;
        }
        t30_len = fax_tx(&fax_state, t30_amp, SAMPLES_PER_CHUNK);
        /* The receive side always expects a full block of samples, but the
           transmit side may not be sending any when it doesn't need to. We
           may need to pad with some silence. */
        if (t30_len < SAMPLES_PER_CHUNK)
        {
            memset(t30_amp + t30_len, 0, sizeof(int16_t)*(SAMPLES_PER_CHUNK - t30_len));
            t30_len = SAMPLES_PER_CHUNK;
        }
        if (log_audio)
        {
            for (k = 0;  k < t30_len;  k++)
                out_amp[2*k] = t30_amp[k];
        }
        if (t31_rx(&t31_state, t30_amp, t30_len))
            break;
        if (countdown)
        {
            if (answered)
            {
                countdown = 0;
                t31_call_event(&t31_state, AT_CALL_EVENT_ANSWERED);
            }
            else if (--countdown == 0)
            {
                t31_call_event(&t31_state, AT_CALL_EVENT_ALERTING);
                countdown = 250;
            }
        }

        t31_len = t31_tx(&t31_state, t31_amp, SAMPLES_PER_CHUNK);
        if (t31_len < SAMPLES_PER_CHUNK)
        {
            memset(t31_amp + t31_len, 0, sizeof(int16_t)*(SAMPLES_PER_CHUNK - t31_len));
            t31_len = SAMPLES_PER_CHUNK;
        }
        if (log_audio)
        {
            for (k = 0;  k < t31_len;  k++)
                out_amp[2*k + 1] = t31_amp[k];
        }
        if (fax_rx(&fax_state, t31_amp, SAMPLES_PER_CHUNK))
            break;

        if (log_audio)
        {
            outframes = afWriteFrames(wave_handle, AF_DEFAULT_TRACK, out_amp, SAMPLES_PER_CHUNK);
            if (outframes != SAMPLES_PER_CHUNK)
                break;
        }
    }
    if (decode_test_file)
    {
        if (afCloseFile(in_handle) != 0)
        {
            fprintf(stderr, "    Cannot close wave file '%s'\n", decode_test_file);
            exit(2);
        }
    }
    if (log_audio)
    {
        if (afCloseFile(wave_handle) != 0)
        {
            fprintf(stderr, "    Cannot close wave file '%s'\n", OUTPUT_WAVE_FILE_NAME);
            exit(2);
        }
        afFreeFileSetup(filesetup);
    }
    if (done)
    {
        printf("Tests passed\n");
    }
    return  0;
}
/*- End of function --------------------------------------------------------*/
/*- End of file ------------------------------------------------------------*/