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/**
 * SPDX license identifier: MPL-2.0
 *
 * Copyright (C) 2015, GENIVI Alliance
 *
 * This file is part of GENIVI Demo Platform HMI.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License (MPL), v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * For further information see http://www.genivi.org/.
 *
 * List of changes:
 * 10.Feb.2015, Holger Behrens, written
 * 16.Feb.2015, Holger Behrens, complete focus handling of already running app
 */

/*! \file gdp-dbus-service.cpp
 *  \brief HMI controller service API on D-Bus for the GENIVI Demo Platform
 *   
 *   This component implements the HMI controller service API and makes it
 *   available on the D-Bus session bus.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <systemd/sd-journal.h>

#include "gdp-hmi-surfaces.h"
#include "gdp-dbus-service.h"
#include "gdp-dbus-systemd.h"

extern SystemdService *gSystemdSession;     // systemd on session bus (d-bus)
extern SystemdService *gSystemd;            // systemd on system  bus (d-bus)

HmiService::HmiService(DBus::Connection &connection)
  : DBus::ObjectAdaptor(connection, GDP_DBUS_SERVICE_PATH)
{
    sd_journal_print(LOG_INFO, "HmiService - constructor (path= %s)\n",
        GDP_DBUS_SERVICE_PATH);
}

int64_t HmiService::GetId()
{
    sd_journal_print(LOG_DEBUG, "HmiService::GetId() - %d\n", getpid());
    return getpid();
}

std::string HmiService::Show(const std::string &unit)
{
    if (0 == unit.compare(0, 15, "poweroff.target")) {
        sd_journal_print(LOG_DEBUG, "HmiService::Show() - %s (match)\n",
            unit.c_str());
        std::string path = gSystemd->StartUnit(unit, "replace");
    } else {
        sd_journal_print(LOG_DEBUG, "HmiService::Show() - %s\n",
            unit.c_str());
        for (int count = 0; count < gdp_surfaces_num; count++) {
            if (0 == unit.compare(gdp_surfaces[count].unit)) {
                if (ILM_TRUE == gdp_surfaces[count].created) {
                    extern void surface_control(const int index);
                    // bring gdp_surfaces[count].id_surface to front
                    surface_control(count);
                    sd_journal_print(LOG_DEBUG,
                        "HmiService::Show() - %s surface (%d) exists.\n",
                        unit.c_str(), gdp_surfaces[count].id_surface);
                } else {
                    // request systemd to start the unit
                    std::string path = gSystemdSession->StartUnit(unit, "replace");
                    sd_journal_print(LOG_DEBUG,
                        "systemd(session)::StartUnit() - %s\n", path.c_str());
                }
                break; // for-loop
            }
            else {
                sd_journal_print(LOG_DEBUG, "DEBUG: compare \"%s\" with \"%s\"",
                    unit.c_str(), gdp_surfaces[count].unit.c_str());
            }
        } // for-loop
    }
    return "Show unit \"" + unit + "\"!";
}