/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * mmcli -- Control modem status & access information from the command line
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright (C) 2011 - 2021 Aleksander Morgado <aleksander@aleksander.es>
 * Copyright (C) 2012 - 2021 Google, Inc.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include <string.h>

#include <glib.h>
#include <gio/gio.h>

#define _LIBMM_INSIDE_MMCLI
#include <libmm-glib.h>

#include "mmcli.h"
#include "mmcli-common.h"
#include "mmcli-output.h"

/* Context */
typedef struct {
    MMManager       *manager;
    GCancellable    *cancellable;
    MMObject        *object;
    MMModem3gppUssd *modem_3gpp_ussd;
} Context;
static Context *ctx;

/* Options */
static gboolean  ussd_status_flag;
static gchar    *ussd_initiate_str;
static gchar    *ussd_respond_str;
static gboolean  ussd_cancel_flag;

static GOptionEntry entries[] = {
    { "3gpp-ussd-status", 0, 0, G_OPTION_ARG_NONE, &ussd_status_flag,
      "Show status of any ongoing USSD session",
      NULL
    },
    { "3gpp-ussd-initiate", 0, 0, G_OPTION_ARG_STRING, &ussd_initiate_str,
      "Request a given modem to initiate a USSD session",
      "[command]"
    },
    { "3gpp-ussd-respond", 0, 0, G_OPTION_ARG_STRING, &ussd_respond_str,
      "Request a given modem to respond to a USSD request",
      "[response]"
    },
    { "3gpp-ussd-cancel", 0, 0, G_OPTION_ARG_NONE, &ussd_cancel_flag,
      "Request to cancel any ongoing USSD session",
      NULL
    },
    { NULL }
};

GOptionGroup *
mmcli_modem_3gpp_ussd_get_option_group (void)
{
    GOptionGroup *group;

    group = g_option_group_new ("3gpp-ussd",
                                "3GPP USSD options:",
                                "Show 3GPP USSD related options",
                                NULL,
                                NULL);
    g_option_group_add_entries (group, entries);

    return group;
}

gboolean
mmcli_modem_3gpp_ussd_options_enabled (void)
{
    static guint    n_actions = 0;
    static gboolean checked = FALSE;

    if (checked)
        return !!n_actions;

    n_actions = (ussd_status_flag +
                 !!ussd_initiate_str +
                 !!ussd_respond_str +
                 ussd_cancel_flag);

    if (n_actions > 1) {
        g_printerr ("error: too many 3GPP USSD actions requested\n");
        exit (EXIT_FAILURE);
    }

    /* USSD initiate and respond will wait for URCs to get finished, so
     * these are truly async. */
    if (ussd_initiate_str || ussd_respond_str)
        mmcli_force_async_operation ();

    if (ussd_status_flag)
        mmcli_force_sync_operation ();

    checked = TRUE;
    return !!n_actions;
}

static void
context_free (void)
{
    if (!ctx)
        return;

    if (ctx->cancellable)
        g_object_unref (ctx->cancellable);
    if (ctx->modem_3gpp_ussd)
        g_object_unref (ctx->modem_3gpp_ussd);
    if (ctx->object)
        g_object_unref (ctx->object);
    if (ctx->manager)
        g_object_unref (ctx->manager);
    g_free (ctx);
}

static void
ensure_modem_3gpp_ussd (void)
{
    if (mm_modem_get_state (mm_object_peek_modem (ctx->object)) < MM_MODEM_STATE_ENABLED) {
        g_printerr ("error: modem not enabled yet\n");
        exit (EXIT_FAILURE);
    }

    if (!ctx->modem_3gpp_ussd) {
        g_printerr ("error: modem has no 3GPP USSD capabilities\n");
        exit (EXIT_FAILURE);
    }

    /* Success */
}

void
mmcli_modem_3gpp_ussd_shutdown (void)
{
    context_free ();
}

static void
print_ussd_status (void)
{
    mmcli_output_string (MMC_F_GENERAL_DBUS_PATH,              mm_modem_3gpp_ussd_get_path (ctx->modem_3gpp_ussd));
    mmcli_output_string (MMC_F_3GPP_USSD_STATUS,               mm_modem_3gpp_ussd_session_state_get_string (
                                                                 mm_modem_3gpp_ussd_get_state (ctx->modem_3gpp_ussd)));
    mmcli_output_string (MMC_F_3GPP_USSD_NETWORK_REQUEST,      mm_modem_3gpp_ussd_get_network_request      (ctx->modem_3gpp_ussd));
    mmcli_output_string (MMC_F_3GPP_USSD_NETWORK_NOTIFICATION, mm_modem_3gpp_ussd_get_network_notification (ctx->modem_3gpp_ussd));
    mmcli_output_dump ();
}

static void
ussd_initiate_process_reply (gchar        *result,
                             const GError *error)
{
    if (!result) {
        g_printerr ("error: couldn't initiate USSD session: '%s'\n",
                    error ? error->message : "unknown error");
        exit (EXIT_FAILURE);
    }

    g_print ("USSD session initiated; "
             "new reply from network: '%s'\n", result);
    g_free (result);
}

static void
ussd_initiate_ready (MMModem3gppUssd *modem_3gpp_ussd,
                     GAsyncResult    *result)
{
    gchar  *operation_result;
    GError *error = NULL;

    operation_result = mm_modem_3gpp_ussd_initiate_finish (modem_3gpp_ussd, result, &error);
    ussd_initiate_process_reply (operation_result, error);

    mmcli_async_operation_done ();
}

static void
ussd_respond_process_reply (gchar        *result,
                            const GError *error)
{
    if (!result) {
        g_printerr ("error: couldn't send response in USSD session: '%s'\n",
                    error ? error->message : "unknown error");
        exit (EXIT_FAILURE);
    }

    g_print ("response successfully sent in USSD session; "
             "new reply from network: '%s'\n", result);
    g_free (result);
}

static void
ussd_respond_ready (MMModem3gppUssd *modem_3gpp_ussd,
                    GAsyncResult    *result)
{
    gchar  *operation_result;
    GError *error = NULL;

    operation_result = mm_modem_3gpp_ussd_respond_finish (modem_3gpp_ussd, result, &error);
    ussd_respond_process_reply (operation_result, error);

    mmcli_async_operation_done ();
}

static void
ussd_cancel_process_reply (gboolean      result,
                           const GError *error)
{
    if (!result) {
        g_printerr ("error: couldn't cancel USSD session: '%s'\n",
                    error ? error->message : "unknown error");
        exit (EXIT_FAILURE);
    }

    g_print ("successfully cancelled USSD session\n");
}

static void
ussd_cancel_ready (MMModem3gppUssd *modem_3gpp_ussd,
                   GAsyncResult    *result)
{
    gboolean  operation_result;
    GError   *error = NULL;

    operation_result = mm_modem_3gpp_ussd_cancel_finish (modem_3gpp_ussd, result, &error);
    ussd_cancel_process_reply (operation_result, error);

    mmcli_async_operation_done ();
}

static void
get_modem_ready (GObject      *source,
                 GAsyncResult *result,
                 gpointer      none)
{
    ctx->object = mmcli_get_modem_finish (result, &ctx->manager);
    ctx->modem_3gpp_ussd = mm_object_get_modem_3gpp_ussd (ctx->object);

    /* Setup operation timeout */
    if (ctx->modem_3gpp_ussd)
        mmcli_force_operation_timeout (G_DBUS_PROXY (ctx->modem_3gpp_ussd));

    ensure_modem_3gpp_ussd ();

    if (ussd_status_flag)
        g_assert_not_reached ();

    /* Request to initiate USSD session? */
    if (ussd_initiate_str) {
        g_debug ("Asynchronously initiating USSD session...");
        mm_modem_3gpp_ussd_initiate (ctx->modem_3gpp_ussd,
                                     ussd_initiate_str,
                                     ctx->cancellable,
                                     (GAsyncReadyCallback)ussd_initiate_ready,
                                     NULL);
        return;
    }

    /* Request to respond in USSD session? */
    if (ussd_respond_str) {
        g_debug ("Asynchronously sending response in USSD session...");
        mm_modem_3gpp_ussd_respond (ctx->modem_3gpp_ussd,
                                    ussd_respond_str,
                                    ctx->cancellable,
                                    (GAsyncReadyCallback)ussd_respond_ready,
                                    NULL);
        return;
    }

    /* Request to cancel USSD session? */
    if (ussd_cancel_flag) {
        g_debug ("Asynchronously cancelling USSD session...");
        mm_modem_3gpp_ussd_cancel (ctx->modem_3gpp_ussd,
                                   ctx->cancellable,
                                   (GAsyncReadyCallback)ussd_cancel_ready,
                                   NULL);
        return;
    }

    g_warn_if_reached ();
}

void
mmcli_modem_3gpp_ussd_run_asynchronous (GDBusConnection *connection,
                                        GCancellable    *cancellable)
{
    /* Initialize context */
    ctx = g_new0 (Context, 1);
    if (cancellable)
        ctx->cancellable = g_object_ref (cancellable);

    /* Get proper modem */
    mmcli_get_modem  (connection,
                      mmcli_get_common_modem_string (),
                      cancellable,
                      (GAsyncReadyCallback)get_modem_ready,
                      NULL);
}

void
mmcli_modem_3gpp_ussd_run_synchronous (GDBusConnection *connection)
{
    GError *error = NULL;

    /* Initialize context */
    ctx = g_new0 (Context, 1);
    ctx->object = mmcli_get_modem_sync (connection,
                                        mmcli_get_common_modem_string (),
                                        &ctx->manager);
    ctx->modem_3gpp_ussd = mm_object_get_modem_3gpp_ussd (ctx->object);

    /* Setup operation timeout */
    if (ctx->modem_3gpp_ussd)
        mmcli_force_operation_timeout (G_DBUS_PROXY (ctx->modem_3gpp_ussd));

    ensure_modem_3gpp_ussd ();

    if (ussd_initiate_str)
        g_assert_not_reached ();
    if (ussd_respond_str)
        g_assert_not_reached ();

    /* Request to show USSD status? */
    if (ussd_status_flag) {
        g_debug ("Printing USSD status...");
        print_ussd_status ();
        return;
    }

    /* Request to cancel USSD session? */
    if (ussd_cancel_flag) {
        gboolean result;

        g_debug ("Asynchronously cancelling USSD session...");
        result = mm_modem_3gpp_ussd_cancel_sync (ctx->modem_3gpp_ussd,
                                                 NULL,
                                                 &error);
        ussd_cancel_process_reply (result, error);
        return;
    }

    g_warn_if_reached ();
}