/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * 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 of the License, 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:
 *
 * Copyright (C) 2012 Google, Inc.
 * Copyright (C) 2012 - 2013 Aleksander Morgado <aleksander@gnu.org>
 * Copyright (C) 2014 Dan Williams <dcbw@redhat.com>
 */

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>

#include <ModemManager.h>
#define _LIBMM_INSIDE_MM
#include <libmm-glib.h>

#include "mm-log.h"
#include "mm-modem-helpers.h"
#include "mm-modem-helpers-mbm.h"

/*****************************************************************************/
/* *E2IPCFG response parser */

static gboolean
validate_address (int family, const char *addr)
{
    struct in6_addr tmp6 = IN6ADDR_ANY_INIT;

    if (inet_pton (family, addr, (void *) &tmp6) != 1)
{
g_message ("%s: famil '%s'", __func__, addr);
        return FALSE;
}
    if ((family == AF_INET6) && IN6_IS_ADDR_UNSPECIFIED (&tmp6))
        return FALSE;
    return TRUE;
}

#define E2IPCFG_TAG "*E2IPCFG"

gboolean
mm_mbm_parse_e2ipcfg_response (const gchar *response,
                               MMBearerIpConfig **out_ip4_config,
                               MMBearerIpConfig **out_ip6_config,
                               GError **error)
{
    MMBearerIpConfig     **ip_config = NULL;
    gboolean               got_address = FALSE;
    gboolean               got_gw = FALSE;
    gboolean               got_dns = FALSE;
    g_autoptr(GRegex)      r = NULL;
    g_autoptr(GMatchInfo)  match_info = NULL;
    GError                *match_error = NULL;
    gchar                 *dns[3] = { 0 };
    guint                  dns_idx = 0;
    int                    family = AF_INET;
    MMBearerIpMethod       method = MM_BEARER_IP_METHOD_STATIC;

    g_return_val_if_fail (out_ip4_config, FALSE);
    g_return_val_if_fail (out_ip6_config, FALSE);

    if (!response || !g_str_has_prefix (response, E2IPCFG_TAG)) {
        g_set_error (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED, "Missing " E2IPCFG_TAG " prefix");
        return FALSE;
    }

    response = mm_strip_tag (response, "*E2IPCFG: ");

    if (strchr (response, ':')) {
        family = AF_INET6;
        ip_config = out_ip6_config;
        method = MM_BEARER_IP_METHOD_DHCP;
    } else if (strchr (response, '.')) {
        family = AF_INET;
        ip_config = out_ip4_config;
        method = MM_BEARER_IP_METHOD_STATIC;
    } else {
        g_set_error (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
                     "Failed to detect " E2IPCFG_TAG " address family");
        return FALSE;
    }

    /* *E2IPCFG: (1,<IP>)(2,<gateway>)(3,<DNS>)(3,<DNS>)
     *
     * *E2IPCFG: (1,"46.157.32.246")(2,"46.157.32.243")(3,"193.213.112.4")(3,"130.67.15.198")
     * *E2IPCFG: (1,"fe80:0000:0000:0000:0000:0000:e537:1801")(3,"2001:4600:0004:0fff:0000:0000:0000:0054")(3,"2001:4600:0004:1fff:0000:0000:0000:0054")
     * *E2IPCFG: (1,"fe80:0000:0000:0000:0000:0027:b7fe:9401")(3,"fd00:976a:0000:0000:0000:0000:0000:0009")
     */
    r = g_regex_new ("\\((\\d),\"([0-9a-fA-F.:]+)\"\\)", 0, 0, NULL);
    g_assert (r != NULL);

    if (!g_regex_match_full (r, response, -1, 0, 0, &match_info, &match_error)) {
        if (match_error) {
            g_propagate_error (error, match_error);
            g_prefix_error (error, "Could not parse " E2IPCFG_TAG " results: ");
        } else {
            g_set_error_literal (error,
                                 MM_CORE_ERROR,
                                 MM_CORE_ERROR_FAILED,
                                 "Couldn't match " E2IPCFG_TAG " reply");
        }
        return FALSE;
    }

    *ip_config = mm_bearer_ip_config_new ();
    mm_bearer_ip_config_set_method (*ip_config, method);
    while (g_match_info_matches (match_info)) {
        g_autofree gchar *id = NULL;
        g_autofree gchar *str = NULL;

        id = g_match_info_fetch (match_info, 1);
        str = g_match_info_fetch (match_info, 2);

        switch (atoi (id)) {
        case 1:
            if (validate_address (family, str)) {
                mm_bearer_ip_config_set_address (*ip_config, str);
                mm_bearer_ip_config_set_prefix (*ip_config, (family == AF_INET6) ? 64 : 28);
                got_address = TRUE;
            }
            break;
        case 2:
            if ((family == AF_INET) && validate_address (family, str)) {
                mm_bearer_ip_config_set_gateway (*ip_config, str);
                got_gw = TRUE;
            }
            break;
        case 3:
            if (validate_address (family, str)) {
                dns[dns_idx++] = g_strdup (str);
                got_dns = TRUE;
            }
            break;
        default:
            break;
        }
        g_match_info_next (match_info, NULL);
    }

    if (got_dns) {
        mm_bearer_ip_config_set_dns (*ip_config, (const gchar **) dns);
        g_free (dns[0]);
        g_free (dns[1]);
    }

    if (!got_address || (family == AF_INET && !got_gw)) {
        g_object_unref (*ip_config);
        *ip_config = NULL;
        g_set_error_literal (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
                             "Got incomplete IP configuration from " E2IPCFG_TAG);
        return FALSE;
    }

    return TRUE;
}

/*****************************************************************************/

#define CFUN_TAG "+CFUN:"

static void
add_supported_mode (guint     mode,
                    gpointer  log_object,
                    guint32  *mask)
{
    g_assert (mask);
    if (mode >= 32)
        mm_obj_warn (log_object, "ignored unexpected mode in +CFUN match: %d", mode);
    else
        *mask |= (1 << mode);
}

gboolean
mm_mbm_parse_cfun_test (const gchar *response,
                        gpointer     log_object,
                        guint32     *supported_mask,
                        GError     **error)
{
    gchar **groups;
    guint32 mask = 0;

    g_assert (supported_mask);

    if (!response || !g_str_has_prefix (response, CFUN_TAG)) {
        g_set_error_literal (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
                             "Missing " CFUN_TAG " prefix");
        return FALSE;
    }

    /*
     * AT+CFUN=?
     * +CFUN: (0,1,4-6),(0,1)
     * OK
     */

    /* Strip tag from response */
    response = mm_strip_tag (response, CFUN_TAG);

    /* Split response in (groups) */
    groups = mm_split_string_groups (response);

    /* First group is the one listing supported modes */
    if (groups && groups[0]) {
        gchar **supported_modes;

        supported_modes = g_strsplit_set (groups[0], ", ", -1);
        if (supported_modes) {
            guint i;

            for (i = 0; supported_modes[i]; i++) {
                gchar *separator;
                guint mode;

                if (!supported_modes[i][0])
                    continue;

                /* Check if this is a range that's being given to us */
                separator = strchr (supported_modes[i], '-');
                if (separator) {
                    gchar *first_str;
                    gchar *last_str;
                    guint first;
                    guint last;

                    *separator = '\0';
                    first_str = supported_modes[i];
                    last_str = separator + 1;

                    if (!mm_get_uint_from_str (first_str, &first))
                        mm_obj_warn (log_object, "couldn't match range start: '%s'", first_str);
                    else if (!mm_get_uint_from_str (last_str, &last))
                        mm_obj_warn (log_object, "couldn't match range stop: '%s'", last_str);
                    else if (first >= last)
                        mm_obj_warn (log_object, "couldn't match range: wrong first '%s' and last '%s' items", first_str, last_str);
                    else {
                        for (mode = first; mode <= last; mode++)
                            add_supported_mode (mode, log_object, &mask);
                    }
                } else {
                    if (!mm_get_uint_from_str (supported_modes[i], &mode))
                        mm_obj_warn (log_object, "couldn't match mode: '%s'", supported_modes[i]);
                    else
                        add_supported_mode (mode, log_object, &mask);
                }
            }

            g_strfreev (supported_modes);
        }
    }
    g_strfreev (groups);

    if (mask)
        *supported_mask = mask;
    return !!mask;
}

/*****************************************************************************/
/* AT+CFUN? response parsers */

gboolean
mm_mbm_parse_cfun_query_power_state (const gchar        *response,
                                     MMModemPowerState  *out_state,
                                     GError            **error)
{
    guint state;

    if (!mm_3gpp_parse_cfun_query_response (response, &state, error))
        return FALSE;

    switch (state) {
    case MBM_NETWORK_MODE_OFFLINE:
        *out_state = MM_MODEM_POWER_STATE_OFF;
        return TRUE;
    case MBM_NETWORK_MODE_LOW_POWER:
        *out_state = MM_MODEM_POWER_STATE_LOW;
        return TRUE;
    case MBM_NETWORK_MODE_ANY:
    case MBM_NETWORK_MODE_2G:
    case MBM_NETWORK_MODE_3G:
        *out_state = MM_MODEM_POWER_STATE_ON;
        return TRUE;
    default:
        g_set_error (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
                     "Unknown +CFUN pòwer state: '%u'", state);
        return FALSE;
    }
}

gboolean
mm_mbm_parse_cfun_query_current_modes (const gchar  *response,
                                       MMModemMode  *allowed,
                                       gint         *mbm_mode,
                                       GError      **error)
{
    guint state;

    g_assert (mbm_mode);
    g_assert (allowed);

    if (!mm_3gpp_parse_cfun_query_response (response, &state, error))
        return FALSE;

    switch (state) {
    case MBM_NETWORK_MODE_OFFLINE:
    case MBM_NETWORK_MODE_LOW_POWER:
        /* Do not update mbm_mode */
        *allowed = MM_MODEM_MODE_NONE;
        return TRUE;
    case MBM_NETWORK_MODE_2G:
        *mbm_mode = MBM_NETWORK_MODE_2G;
        *allowed = MM_MODEM_MODE_2G;
        return TRUE;
    case MBM_NETWORK_MODE_3G:
        *mbm_mode = MBM_NETWORK_MODE_3G;
        *allowed = MM_MODEM_MODE_3G;
        return TRUE;
    case MBM_NETWORK_MODE_ANY:
        /* Do not update mbm_mode */
        *allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
        return TRUE;
    default:
        g_set_error (error, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
                     "Unknown +CFUN current mode: '%u'", state);
        return FALSE;
    }
}