/* Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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#include <LocationUtil.h>
#include <log_util.h>
#include <inttypes.h>
#include <gps_extended_c.h>
#include <loc_misc_utils.h>

namespace android {
namespace hardware {
namespace gnss {
namespace V2_0 {
namespace implementation {

using ::android::hardware::gnss::V2_0::GnssLocation;
using ::android::hardware::gnss::V2_0::ElapsedRealtimeFlags;
using ::android::hardware::gnss::V2_0::GnssConstellationType;
using ::android::hardware::gnss::V1_0::GnssLocationFlags;

void convertGnssLocation(Location& in, V1_0::GnssLocation& out)
{
    memset(&out, 0, sizeof(V1_0::GnssLocation));
    if (in.flags & LOCATION_HAS_LAT_LONG_BIT) {
        out.gnssLocationFlags |= GnssLocationFlags::HAS_LAT_LONG;
        out.latitudeDegrees = in.latitude;
        out.longitudeDegrees = in.longitude;
    }
    if (in.flags & LOCATION_HAS_ALTITUDE_BIT) {
        out.gnssLocationFlags |= GnssLocationFlags::HAS_ALTITUDE;
        out.altitudeMeters = in.altitude;
    }
    if (in.flags & LOCATION_HAS_SPEED_BIT) {
        out.gnssLocationFlags |= GnssLocationFlags::HAS_SPEED;
        out.speedMetersPerSec = in.speed;
    }
    if (in.flags & LOCATION_HAS_BEARING_BIT) {
        out.gnssLocationFlags |= GnssLocationFlags::HAS_BEARING;
        out.bearingDegrees = in.bearing;
    }
    if (in.flags & LOCATION_HAS_ACCURACY_BIT) {
        out.gnssLocationFlags |= GnssLocationFlags::HAS_HORIZONTAL_ACCURACY;
        out.horizontalAccuracyMeters = in.accuracy;
    }
    if (in.flags & LOCATION_HAS_VERTICAL_ACCURACY_BIT) {
        out.gnssLocationFlags |= GnssLocationFlags::HAS_VERTICAL_ACCURACY;
        out.verticalAccuracyMeters = in.verticalAccuracy;
    }
    if (in.flags & LOCATION_HAS_SPEED_ACCURACY_BIT) {
        out.gnssLocationFlags |= GnssLocationFlags::HAS_SPEED_ACCURACY;
        out.speedAccuracyMetersPerSecond = in.speedAccuracy;
    }
    if (in.flags & LOCATION_HAS_BEARING_ACCURACY_BIT) {
        out.gnssLocationFlags |= GnssLocationFlags::HAS_BEARING_ACCURACY;
        out.bearingAccuracyDegrees = in.bearingAccuracy;
    }

    out.timestamp = static_cast<V1_0::GnssUtcTime>(in.timestamp);
}

bool getCurrentTime(struct timespec& currentTime, int64_t& sinceBootTimeNanos)
{
    struct timespec sinceBootTime;
    struct timespec sinceBootTimeTest;
    bool clockGetTimeSuccess = false;
    const uint32_t MAX_TIME_DELTA_VALUE_NANOS = 10000;
    const uint32_t MAX_GET_TIME_COUNT = 20;
    /* Attempt to get CLOCK_REALTIME and CLOCK_BOOTIME in succession without an interruption
    or context switch (for up to MAX_GET_TIME_COUNT times) to avoid errors in the calculation */
    for (uint32_t i = 0; i < MAX_GET_TIME_COUNT; i++) {
        if (clock_gettime(CLOCK_BOOTTIME, &sinceBootTime) != 0) {
            break;
        };
        if (clock_gettime(CLOCK_REALTIME, &currentTime) != 0) {
            break;
        }
        if (clock_gettime(CLOCK_BOOTTIME, &sinceBootTimeTest) != 0) {
            break;
        };
        sinceBootTimeNanos = sinceBootTime.tv_sec * 1000000000 + sinceBootTime.tv_nsec;
        int64_t sinceBootTimeTestNanos =
            sinceBootTimeTest.tv_sec * 1000000000 + sinceBootTimeTest.tv_nsec;
        int64_t sinceBootTimeDeltaNanos = sinceBootTimeTestNanos - sinceBootTimeNanos;

        /* sinceBootTime and sinceBootTimeTest should have a close value if there was no
        interruption or context switch between clock_gettime for CLOCK_BOOTIME and
        clock_gettime for CLOCK_REALTIME */
        if (sinceBootTimeDeltaNanos < MAX_TIME_DELTA_VALUE_NANOS) {
            clockGetTimeSuccess = true;
            break;
        } else {
            LOC_LOGd("Delta:%" PRIi64 "ns time too large, retry number #%u...",
                     sinceBootTimeDeltaNanos, i + 1);
        }
    }
    return clockGetTimeSuccess;
}

void convertGnssLocation(Location& in, V2_0::GnssLocation& out)
{
    memset(&out, 0, sizeof(V2_0::GnssLocation));
    convertGnssLocation(in, out.v1_0);

    struct timespec currentTime;
    int64_t sinceBootTimeNanos;

    if (getCurrentTime(currentTime, sinceBootTimeNanos)) {
        if (in.flags & LOCATION_HAS_ELAPSED_REAL_TIME) {
            uint64_t qtimerDiff = 0;
            uint64_t qTimerTickCount = getQTimerTickCount();
            if (qTimerTickCount >= in.elapsedRealTime) {
                qtimerDiff = qTimerTickCount - in.elapsedRealTime;
            }
            LOC_LOGv("sinceBootTimeNanos:%" PRIi64 " in.elapsedRealTime=%" PRIi64 ""
                     " qTimerTickCount=%" PRIi64 " qtimerDiff=%" PRIi64 "",
                     sinceBootTimeNanos, in.elapsedRealTime, qTimerTickCount, qtimerDiff);
            uint64_t qTimerDiffNanos = qTimerTicksToNanos(double(qtimerDiff));

            /* If the time difference between Qtimer on modem side and Qtimer on AP side
               is greater than one second we assume this is a dual-SoC device such as
               Kona and will try to get Qtimer on modem side and on AP side and
               will adjust our difference accordingly */
            if (qTimerDiffNanos > 1000000000) {
                uint64_t qtimerDelta = getQTimerDeltaNanos();
                if (qTimerDiffNanos >= qtimerDelta) {
                    qTimerDiffNanos -= qtimerDelta;
                }
            }

            if (sinceBootTimeNanos >= qTimerDiffNanos) {
                out.elapsedRealtime.flags |= ElapsedRealtimeFlags::HAS_TIMESTAMP_NS;
                out.elapsedRealtime.timestampNs = sinceBootTimeNanos - qTimerDiffNanos;
                out.elapsedRealtime.flags |= ElapsedRealtimeFlags::HAS_TIME_UNCERTAINTY_NS;
                out.elapsedRealtime.timeUncertaintyNs = in.elapsedRealTimeUnc;
            }
        } else {
            int64_t currentTimeNanos = currentTime.tv_sec*1000000000 + currentTime.tv_nsec;
            int64_t locationTimeNanos = in.timestamp*1000000;
            LOC_LOGv("sinceBootTimeNanos:%" PRIi64 " currentTimeNanos:%" PRIi64 ""
                     " locationTimeNanos:%" PRIi64 "",
                     sinceBootTimeNanos, currentTimeNanos, locationTimeNanos);
            if (currentTimeNanos >= locationTimeNanos) {
                int64_t ageTimeNanos = currentTimeNanos - locationTimeNanos;
                LOC_LOGv("ageTimeNanos:%" PRIi64 ")", ageTimeNanos);
                // the max trusted propagation time 100ms for ageTimeNanos to avoid user setting
                // wrong time, it will affect elapsedRealtimeNanos
                if (ageTimeNanos <= 100000000) {
                    out.elapsedRealtime.flags |= ElapsedRealtimeFlags::HAS_TIMESTAMP_NS;
                    out.elapsedRealtime.timestampNs = sinceBootTimeNanos - ageTimeNanos;
                    out.elapsedRealtime.flags |= ElapsedRealtimeFlags::HAS_TIME_UNCERTAINTY_NS;
                    // time uncertainty is the max value between abs(AP_UTC - MP_UTC) and 100ms, to
                    // verify if user change the sys time
                    out.elapsedRealtime.timeUncertaintyNs =
                            std::max(ageTimeNanos, (int64_t)100000000);
                }
            }
        }
    }
    LOC_LOGv("out.elapsedRealtime.timestampNs=%" PRIi64 ""
             " out.elapsedRealtime.timeUncertaintyNs=%" PRIi64 ""
             " out.elapsedRealtime.flags=0x%X",
             out.elapsedRealtime.timestampNs,
             out.elapsedRealtime.timeUncertaintyNs, out.elapsedRealtime.flags);
}

void convertGnssLocation(const V1_0::GnssLocation& in, Location& out)
{
    memset(&out, 0, sizeof(out));
    if (in.gnssLocationFlags & GnssLocationFlags::HAS_LAT_LONG) {
        out.flags |= LOCATION_HAS_LAT_LONG_BIT;
        out.latitude = in.latitudeDegrees;
        out.longitude = in.longitudeDegrees;
    }
    if (in.gnssLocationFlags & GnssLocationFlags::HAS_ALTITUDE) {
        out.flags |= LOCATION_HAS_ALTITUDE_BIT;
        out.altitude = in.altitudeMeters;
    }
    if (in.gnssLocationFlags & GnssLocationFlags::HAS_SPEED) {
        out.flags |= LOCATION_HAS_SPEED_BIT;
        out.speed = in.speedMetersPerSec;
    }
    if (in.gnssLocationFlags & GnssLocationFlags::HAS_BEARING) {
        out.flags |= LOCATION_HAS_BEARING_BIT;
        out.bearing = in.bearingDegrees;
    }
    if (in.gnssLocationFlags & GnssLocationFlags::HAS_HORIZONTAL_ACCURACY) {
        out.flags |= LOCATION_HAS_ACCURACY_BIT;
        out.accuracy = in.horizontalAccuracyMeters;
    }
    if (in.gnssLocationFlags & GnssLocationFlags::HAS_VERTICAL_ACCURACY) {
        out.flags |= LOCATION_HAS_VERTICAL_ACCURACY_BIT;
        out.verticalAccuracy = in.verticalAccuracyMeters;
    }
    if (in.gnssLocationFlags & GnssLocationFlags::HAS_SPEED_ACCURACY) {
        out.flags |= LOCATION_HAS_SPEED_ACCURACY_BIT;
        out.speedAccuracy = in.speedAccuracyMetersPerSecond;
    }
    if (in.gnssLocationFlags & GnssLocationFlags::HAS_BEARING_ACCURACY) {
        out.flags |= LOCATION_HAS_BEARING_ACCURACY_BIT;
        out.bearingAccuracy = in.bearingAccuracyDegrees;
    }

    out.timestamp = static_cast<uint64_t>(in.timestamp);
}

void convertGnssLocation(const V2_0::GnssLocation& in, Location& out)
{
    memset(&out, 0, sizeof(out));
    convertGnssLocation(in.v1_0, out);
}

void convertGnssConstellationType(GnssSvType& in, V1_0::GnssConstellationType& out)
{
    switch(in) {
        case GNSS_SV_TYPE_GPS:
            out = V1_0::GnssConstellationType::GPS;
            break;
        case GNSS_SV_TYPE_SBAS:
            out = V1_0::GnssConstellationType::SBAS;
            break;
        case GNSS_SV_TYPE_GLONASS:
            out = V1_0::GnssConstellationType::GLONASS;
            break;
        case GNSS_SV_TYPE_QZSS:
            out = V1_0::GnssConstellationType::QZSS;
            break;
        case GNSS_SV_TYPE_BEIDOU:
            out = V1_0::GnssConstellationType::BEIDOU;
            break;
        case GNSS_SV_TYPE_GALILEO:
            out = V1_0::GnssConstellationType::GALILEO;
            break;
        case GNSS_SV_TYPE_UNKNOWN:
        default:
            out = V1_0::GnssConstellationType::UNKNOWN;
            break;
    }
}

void convertGnssConstellationType(GnssSvType& in, V2_0::GnssConstellationType& out)
{
    switch(in) {
        case GNSS_SV_TYPE_GPS:
            out = V2_0::GnssConstellationType::GPS;
            break;
        case GNSS_SV_TYPE_SBAS:
            out = V2_0::GnssConstellationType::SBAS;
            break;
        case GNSS_SV_TYPE_GLONASS:
            out = V2_0::GnssConstellationType::GLONASS;
            break;
        case GNSS_SV_TYPE_QZSS:
            out = V2_0::GnssConstellationType::QZSS;
            break;
        case GNSS_SV_TYPE_BEIDOU:
            out = V2_0::GnssConstellationType::BEIDOU;
            break;
        case GNSS_SV_TYPE_GALILEO:
            out = V2_0::GnssConstellationType::GALILEO;
            break;
        case GNSS_SV_TYPE_NAVIC:
            out = V2_0::GnssConstellationType::IRNSS;
            break;
        case GNSS_SV_TYPE_UNKNOWN:
        default:
            out = V2_0::GnssConstellationType::UNKNOWN;
            break;
    }
}

void convertGnssSvid(GnssSv& in, int16_t& out)
{
    switch (in.type) {
        case GNSS_SV_TYPE_GPS:
            out = in.svId;
            break;
        case GNSS_SV_TYPE_SBAS:
            out = in.svId;
            break;
        case GNSS_SV_TYPE_GLONASS:
            out = in.svId - GLO_SV_PRN_MIN + 1;
            break;
        case GNSS_SV_TYPE_QZSS:
            out = in.svId;
            break;
        case GNSS_SV_TYPE_BEIDOU:
            out = in.svId - BDS_SV_PRN_MIN + 1;
            break;
        case GNSS_SV_TYPE_GALILEO:
            out = in.svId - GAL_SV_PRN_MIN + 1;
            break;
        case GNSS_SV_TYPE_NAVIC:
            /*Android doesn't define Navic svid range yet, use Naviv svid [1, 14] now
              will update this once Android give Navic svid definiitons */
            out = in.svId - NAVIC_SV_PRN_MIN + 1;
            break;
        default:
            out = in.svId;
            break;
    }
}

void convertGnssSvid(GnssMeasurementsData& in, int16_t& out)
{
    switch (in.svType) {
        case GNSS_SV_TYPE_GPS:
            out = in.svId;
            break;
        case GNSS_SV_TYPE_SBAS:
            out = in.svId;
            break;
        case GNSS_SV_TYPE_GLONASS:
            if (in.svId != 255) { // OSN is known
                out = in.svId - GLO_SV_PRN_MIN + 1;
            } else { // OSN is not known, report FCN
                out = in.gloFrequency + 92;
            }
            break;
        case GNSS_SV_TYPE_QZSS:
            out = in.svId;
            break;
        case GNSS_SV_TYPE_BEIDOU:
            out = in.svId - BDS_SV_PRN_MIN + 1;
            break;
        case GNSS_SV_TYPE_GALILEO:
            out = in.svId - GAL_SV_PRN_MIN + 1;
            break;
        case GNSS_SV_TYPE_NAVIC:
            /*Android doesn't define Navic svid range yet, use Naviv svid [1, 14] now
              will update this once Android give Navic svid definiitons */
            out = in.svId - NAVIC_SV_PRN_MIN + 1;
            break;
        default:
            out = in.svId;
            break;
    }
}

void convertGnssEphemerisType(GnssEphemerisType& in, GnssDebug::SatelliteEphemerisType& out)
{
    switch(in) {
        case GNSS_EPH_TYPE_EPHEMERIS:
            out = GnssDebug::SatelliteEphemerisType::EPHEMERIS;
            break;
        case GNSS_EPH_TYPE_ALMANAC:
            out = GnssDebug::SatelliteEphemerisType::ALMANAC_ONLY;
            break;
        case GNSS_EPH_TYPE_UNKNOWN:
        default:
            out = GnssDebug::SatelliteEphemerisType::NOT_AVAILABLE;
            break;
    }
}

void convertGnssEphemerisSource(GnssEphemerisSource& in, GnssDebug::SatelliteEphemerisSource& out)
{
    switch(in) {
        case GNSS_EPH_SOURCE_DEMODULATED:
            out = GnssDebug::SatelliteEphemerisSource::DEMODULATED;
            break;
        case GNSS_EPH_SOURCE_SUPL_PROVIDED:
            out = GnssDebug::SatelliteEphemerisSource::SUPL_PROVIDED;
            break;
        case GNSS_EPH_SOURCE_OTHER_SERVER_PROVIDED:
            out = GnssDebug::SatelliteEphemerisSource::OTHER_SERVER_PROVIDED;
            break;
        case GNSS_EPH_SOURCE_LOCAL:
        case GNSS_EPH_SOURCE_UNKNOWN:
        default:
            out = GnssDebug::SatelliteEphemerisSource::OTHER;
            break;
    }
}

void convertGnssEphemerisHealth(GnssEphemerisHealth& in, GnssDebug::SatelliteEphemerisHealth& out)
{
    switch(in) {
        case GNSS_EPH_HEALTH_GOOD:
            out = GnssDebug::SatelliteEphemerisHealth::GOOD;
            break;
        case GNSS_EPH_HEALTH_BAD:
            out = GnssDebug::SatelliteEphemerisHealth::BAD;
            break;
        case GNSS_EPH_HEALTH_UNKNOWN:
        default:
            out = GnssDebug::SatelliteEphemerisHealth::UNKNOWN;
            break;
    }
}

}  // namespace implementation
}  // namespace V2_0
}  // namespace gnss
}  // namespace hardware
}  // namespace android