/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.telephony;

import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.Log;

/**
 * Contains phone signal strength related information.
 */
public class SignalStrength implements Parcelable {

    private static final String LOG_TAG = "SignalStrength";
    private static final boolean DBG = false;

    /** @hide */
    public static final int SIGNAL_STRENGTH_NONE_OR_UNKNOWN = 0;
    /** @hide */
    public static final int SIGNAL_STRENGTH_POOR = 1;
    /** @hide */
    public static final int SIGNAL_STRENGTH_MODERATE = 2;
    /** @hide */
    public static final int SIGNAL_STRENGTH_GOOD = 3;
    /** @hide */
    public static final int SIGNAL_STRENGTH_GREAT = 4;
    /** @hide */
    public static final int NUM_SIGNAL_STRENGTH_BINS = 5;
    /** @hide */
    public static final String[] SIGNAL_STRENGTH_NAMES = {
        "none", "poor", "moderate", "good", "great"
    };

    /** @hide */
    //Use int max, as -1 is a valid value in signal strength
    public static final int INVALID = 0x7FFFFFFF;

    private int mGsmSignalStrength; // Valid values are (0-31, 99) as defined in TS 27.007 8.5
    private int mGsmBitErrorRate;   // bit error rate (0-7, 99) as defined in TS 27.007 8.5
    private int mCdmaDbm;   // This value is the RSSI value
    private int mCdmaEcio;  // This value is the Ec/Io
    private int mEvdoDbm;   // This value is the EVDO RSSI value
    private int mEvdoEcio;  // This value is the EVDO Ec/Io
    private int mEvdoSnr;   // Valid values are 0-8.  8 is the highest signal to noise ratio
    private int mLteSignalStrength;
    private int mLteRsrp;
    private int mLteRsrq;
    private int mLteRssnr;
    private int mLteCqi;

    private boolean isGsm; // This value is set by the ServiceStateTracker onSignalStrengthResult

    /**
     * Create a new SignalStrength from a intent notifier Bundle
     *
     * This method is used by PhoneStateIntentReceiver and maybe by
     * external applications.
     *
     * @param m Bundle from intent notifier
     * @return newly created SignalStrength
     *
     * @hide
     */
    public static SignalStrength newFromBundle(Bundle m) {
        SignalStrength ret;
        ret = new SignalStrength();
        ret.setFromNotifierBundle(m);
        return ret;
    }

    /**
     * Empty constructor
     *
     * @hide
     */
    public SignalStrength() {
        mGsmSignalStrength = 99;
        mGsmBitErrorRate = -1;
        mCdmaDbm = -1;
        mCdmaEcio = -1;
        mEvdoDbm = -1;
        mEvdoEcio = -1;
        mEvdoSnr = -1;
        mLteSignalStrength = 99;
        mLteRsrp = INVALID;
        mLteRsrq = INVALID;
        mLteRssnr = INVALID;
        mLteCqi = INVALID;
        isGsm = true;
    }

    /**
     * This constructor is used to create SignalStrength with default
     * values and set the isGsmFlag with the value passed in the input
     *
     * @param gsmFlag true if Gsm Phone,false if Cdma phone
     * @return newly created SignalStrength
     * @hide
     */
    public SignalStrength(boolean gsmFlag) {
        mGsmSignalStrength = 99;
        mGsmBitErrorRate = -1;
        mCdmaDbm = -1;
        mCdmaEcio = -1;
        mEvdoDbm = -1;
        mEvdoEcio = -1;
        mEvdoSnr = -1;
        mLteSignalStrength = 99;
        mLteRsrp = INVALID;
        mLteRsrq = INVALID;
        mLteRssnr = INVALID;
        mLteCqi = INVALID;
        isGsm = gsmFlag;
    }

    /**
     * Constructor
     *
     * @hide
     */
    public SignalStrength(int gsmSignalStrength, int gsmBitErrorRate,
            int cdmaDbm, int cdmaEcio,
            int evdoDbm, int evdoEcio, int evdoSnr,
            int lteSignalStrength, int lteRsrp, int lteRsrq, int lteRssnr, int lteCqi,
            boolean gsmFlag) {
        initialize(gsmSignalStrength, gsmBitErrorRate, cdmaDbm, cdmaEcio,
                evdoDbm, evdoEcio, evdoSnr, lteSignalStrength, lteRsrp,
                lteRsrq, lteRssnr, lteCqi, gsmFlag);
    }

    /**
     * Constructor
     *
     * @hide
     */
    public SignalStrength(int gsmSignalStrength, int gsmBitErrorRate,
            int cdmaDbm, int cdmaEcio,
            int evdoDbm, int evdoEcio, int evdoSnr,
            boolean gsmFlag) {
        initialize(gsmSignalStrength, gsmBitErrorRate, cdmaDbm, cdmaEcio,
                evdoDbm, evdoEcio, evdoSnr, 99, INVALID,
                INVALID, INVALID, INVALID, gsmFlag);
    }

    /**
     * Copy constructors
     *
     * @param s Source SignalStrength
     *
     * @hide
     */
    public SignalStrength(SignalStrength s) {
        copyFrom(s);
    }

    /**
     * Initialize gsm/cdma values, sets lte values to defaults.
     *
     * @param gsmSignalStrength
     * @param gsmBitErrorRate
     * @param cdmaDbm
     * @param cdmaEcio
     * @param evdoDbm
     * @param evdoEcio
     * @param evdoSnr
     * @param gsm
     *
     * @hide
     */
    public void initialize(int gsmSignalStrength, int gsmBitErrorRate,
            int cdmaDbm, int cdmaEcio,
            int evdoDbm, int evdoEcio, int evdoSnr,
            boolean gsm) {
        initialize(gsmSignalStrength, gsmBitErrorRate, cdmaDbm, cdmaEcio,
                evdoDbm, evdoEcio, evdoSnr, 99, INVALID,
                INVALID, INVALID, INVALID, gsm);
    }

    /**
     * Initialize all the values
     *
     * @param gsmSignalStrength
     * @param gsmBitErrorRate
     * @param cdmaDbm
     * @param cdmaEcio
     * @param evdoDbm
     * @param evdoEcio
     * @param evdoSnr
     * @param lteSignalStrength
     * @param lteRsrp
     * @param lteRsrq
     * @param lteRssnr
     * @param lteCqi
     * @param gsm
     *
     * @hide
     */
    public void initialize(int gsmSignalStrength, int gsmBitErrorRate,
            int cdmaDbm, int cdmaEcio,
            int evdoDbm, int evdoEcio, int evdoSnr,
            int lteSignalStrength, int lteRsrp, int lteRsrq, int lteRssnr, int lteCqi,
            boolean gsm) {
        mGsmSignalStrength = gsmSignalStrength;
        mGsmBitErrorRate = gsmBitErrorRate;
        mCdmaDbm = cdmaDbm;
        mCdmaEcio = cdmaEcio;
        mEvdoDbm = evdoDbm;
        mEvdoEcio = evdoEcio;
        mEvdoSnr = evdoSnr;
        mLteSignalStrength = lteSignalStrength;
        mLteRsrp = lteRsrp;
        mLteRsrq = lteRsrq;
        mLteRssnr = lteRssnr;
        mLteCqi = lteCqi;
        isGsm = gsm;
        if (DBG) log("initialize: " + toString());
    }

    /**
     * @hide
     */
    protected void copyFrom(SignalStrength s) {
        mGsmSignalStrength = s.mGsmSignalStrength;
        mGsmBitErrorRate = s.mGsmBitErrorRate;
        mCdmaDbm = s.mCdmaDbm;
        mCdmaEcio = s.mCdmaEcio;
        mEvdoDbm = s.mEvdoDbm;
        mEvdoEcio = s.mEvdoEcio;
        mEvdoSnr = s.mEvdoSnr;
        mLteSignalStrength = s.mLteSignalStrength;
        mLteRsrp = s.mLteRsrp;
        mLteRsrq = s.mLteRsrq;
        mLteRssnr = s.mLteRssnr;
        mLteCqi = s.mLteCqi;
        isGsm = s.isGsm;
    }

    /**
     * Construct a SignalStrength object from the given parcel.
     *
     * @hide
     */
    public SignalStrength(Parcel in) {
        if (DBG) log("Size of signalstrength parcel:" + in.dataSize());

        mGsmSignalStrength = in.readInt();
        mGsmBitErrorRate = in.readInt();
        mCdmaDbm = in.readInt();
        mCdmaEcio = in.readInt();
        mEvdoDbm = in.readInt();
        mEvdoEcio = in.readInt();
        mEvdoSnr = in.readInt();
        mLteSignalStrength = in.readInt();
        mLteRsrp = in.readInt();
        mLteRsrq = in.readInt();
        mLteRssnr = in.readInt();
        mLteCqi = in.readInt();
        isGsm = (in.readInt() != 0);
    }

    /**
     * {@link Parcelable#writeToParcel}
     */
    public void writeToParcel(Parcel out, int flags) {
        out.writeInt(mGsmSignalStrength);
        out.writeInt(mGsmBitErrorRate);
        out.writeInt(mCdmaDbm);
        out.writeInt(mCdmaEcio);
        out.writeInt(mEvdoDbm);
        out.writeInt(mEvdoEcio);
        out.writeInt(mEvdoSnr);
        out.writeInt(mLteSignalStrength);
        out.writeInt(mLteRsrp);
        out.writeInt(mLteRsrq);
        out.writeInt(mLteRssnr);
        out.writeInt(mLteCqi);
        out.writeInt(isGsm ? 1 : 0);
    }

    /**
     * {@link Parcelable#describeContents}
     */
    public int describeContents() {
        return 0;
    }

    /**
     * {@link Parcelable.Creator}
     *
     * @hide
     */
    public static final Parcelable.Creator<SignalStrength> CREATOR = new Parcelable.Creator() {
        public SignalStrength createFromParcel(Parcel in) {
            return new SignalStrength(in);
        }

        public SignalStrength[] newArray(int size) {
            return new SignalStrength[size];
        }
    };

    /**
     * Validate the individual signal strength fields as per the range
     * specified in ril.h
     * Set to invalid any field that is not in the valid range
     * Cdma, evdo, lte rsrp & rsrq values are sign converted
     * when received from ril interface
     *
     * @return
     *      Valid values for all signalstrength fields
     * @hide
     */
    public void validateInput() {
        if (DBG) log("Signal before validate=" + this);
        // TS 27.007 8.5
        mGsmSignalStrength = mGsmSignalStrength >= 0 ? mGsmSignalStrength : 99;
        // BER no change;

        mCdmaDbm = mCdmaDbm > 0 ? -mCdmaDbm : -120;
        mCdmaEcio = (mCdmaEcio > 0) ? -mCdmaEcio : -160;

        mEvdoDbm = (mEvdoDbm > 0) ? -mEvdoDbm : -120;
        mEvdoEcio = (mEvdoEcio > 0) ? -mEvdoEcio : -1;
        mEvdoSnr = ((mEvdoSnr > 0) && (mEvdoSnr <= 8)) ? mEvdoSnr : -1;

        // TS 36.214 Physical Layer Section 5.1.3, TS 36.331 RRC
        mLteSignalStrength = (mLteSignalStrength >= 0) ? mLteSignalStrength : 99;
        mLteRsrp = ((mLteRsrp >= 44) && (mLteRsrp <= 140)) ? -mLteRsrp : SignalStrength.INVALID;
        mLteRsrq = ((mLteRsrq >= 3) && (mLteRsrq <= 20)) ? -mLteRsrq : SignalStrength.INVALID;
        mLteRssnr = ((mLteRssnr >= -200) && (mLteRssnr <= 300)) ? mLteRssnr
                : SignalStrength.INVALID;
        // Cqi no change
        if (DBG) log("Signal after validate=" + this);
    }

    /**
     * @param true - Gsm, Lte phones
     *        false - Cdma phones
     *
     * Used by voice phone to set the isGsm
     *        flag
     * @hide
     */
    public void setGsm(boolean gsmFlag) {
        isGsm = gsmFlag;
    }

    /**
     * Get the GSM Signal Strength, valid values are (0-31, 99) as defined in TS
     * 27.007 8.5
     */
    public int getGsmSignalStrength() {
        return this.mGsmSignalStrength;
    }

    /**
     * Get the GSM bit error rate (0-7, 99) as defined in TS 27.007 8.5
     */
    public int getGsmBitErrorRate() {
        return this.mGsmBitErrorRate;
    }

    /**
     * Get the CDMA RSSI value in dBm
     */
    public int getCdmaDbm() {
        return this.mCdmaDbm;
    }

    /**
     * Get the CDMA Ec/Io value in dB*10
     */
    public int getCdmaEcio() {
        return this.mCdmaEcio;
    }

    /**
     * Get the EVDO RSSI value in dBm
     */
    public int getEvdoDbm() {
        return this.mEvdoDbm;
    }

    /**
     * Get the EVDO Ec/Io value in dB*10
     */
    public int getEvdoEcio() {
        return this.mEvdoEcio;
    }

    /**
     * Get the signal to noise ratio. Valid values are 0-8. 8 is the highest.
     */
    public int getEvdoSnr() {
        return this.mEvdoSnr;
    }

    /** @hide */
    public int getLteSignalStrenght() {
        return mLteSignalStrength;
    }

    /** @hide */
    public int getLteRsrp() {
        return mLteRsrp;
    }

    /** @hide */
    public int getLteRsrq() {
        return mLteRsrq;
    }

    /** @hide */
    public int getLteRssnr() {
        return mLteRssnr;
    }

    /** @hide */
    public int getLteCqi() {
        return mLteCqi;
    }

    /**
     * Get signal level as an int from 0..4
     *
     * @hide
     */
    public int getLevel() {
        int level;

        if (isGsm) {
            level = getLteLevel();
            if (level == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                level = getGsmLevel();
            }
        } else {
            int cdmaLevel = getCdmaLevel();
            int evdoLevel = getEvdoLevel();
            if (evdoLevel == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                /* We don't know evdo, use cdma */
                level = cdmaLevel;
            } else if (cdmaLevel == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                /* We don't know cdma, use evdo */
                level = evdoLevel;
            } else {
                /* We know both, use the lowest level */
                level = cdmaLevel < evdoLevel ? cdmaLevel : evdoLevel;
            }
        }
        if (DBG) log("getLevel=" + level);
        return level;
    }

    /**
     * Get the signal level as an asu value between 0..31, 99 is unknown
     *
     * @hide
     */
    public int getAsuLevel() {
        int asuLevel;
        if (isGsm) {
            if (getLteLevel() == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                asuLevel = getGsmAsuLevel();
            } else {
                asuLevel = getLteAsuLevel();
            }
        } else {
            int cdmaAsuLevel = getCdmaAsuLevel();
            int evdoAsuLevel = getEvdoAsuLevel();
            if (evdoAsuLevel == 0) {
                /* We don't know evdo use, cdma */
                asuLevel = cdmaAsuLevel;
            } else if (cdmaAsuLevel == 0) {
                /* We don't know cdma use, evdo */
                asuLevel = evdoAsuLevel;
            } else {
                /* We know both, use the lowest level */
                asuLevel = cdmaAsuLevel < evdoAsuLevel ? cdmaAsuLevel : evdoAsuLevel;
            }
        }
        if (DBG) log("getAsuLevel=" + asuLevel);
        return asuLevel;
    }

    /**
     * Get the signal strength as dBm
     *
     * @hide
     */
    public int getDbm() {
        int dBm;

        if(isGsm()) {
            if (getLteLevel() == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                dBm = getGsmDbm();
            } else {
                dBm = getLteDbm();
            }
        } else {
            int cdmaDbm = getCdmaDbm();
            int evdoDbm = getEvdoDbm();

            return (evdoDbm == -120) ? cdmaDbm : ((cdmaDbm == -120) ? evdoDbm
                    : (cdmaDbm < evdoDbm ? cdmaDbm : evdoDbm));
        }
        if (DBG) log("getDbm=" + dBm);
        return dBm;
    }

    /**
     * Get Gsm signal strength as dBm
     *
     * @hide
     */
    public int getGsmDbm() {
        int dBm;

        int gsmSignalStrength = getGsmSignalStrength();
        int asu = (gsmSignalStrength == 99 ? -1 : gsmSignalStrength);
        if (asu != -1) {
            dBm = -113 + (2 * asu);
        } else {
            dBm = -1;
        }
        if (DBG) log("getGsmDbm=" + dBm);
        return dBm;
    }

    /**
     * Get gsm as level 0..4
     *
     * @hide
     */
    public int getGsmLevel() {
        int level;

        // ASU ranges from 0 to 31 - TS 27.007 Sec 8.5
        // asu = 0 (-113dB or less) is very weak
        // signal, its better to show 0 bars to the user in such cases.
        // asu = 99 is a special case, where the signal strength is unknown.
        int asu = getGsmSignalStrength();
        if (asu <= 2 || asu == 99) level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        else if (asu >= 12) level = SIGNAL_STRENGTH_GREAT;
        else if (asu >= 8)  level = SIGNAL_STRENGTH_GOOD;
        else if (asu >= 5)  level = SIGNAL_STRENGTH_MODERATE;
        else level = SIGNAL_STRENGTH_POOR;
        if (DBG) log("getGsmLevel=" + level);
        return level;
    }

    /**
     * Get the gsm signal level as an asu value between 0..31, 99 is unknown
     *
     * @hide
     */
    public int getGsmAsuLevel() {
        // ASU ranges from 0 to 31 - TS 27.007 Sec 8.5
        // asu = 0 (-113dB or less) is very weak
        // signal, its better to show 0 bars to the user in such cases.
        // asu = 99 is a special case, where the signal strength is unknown.
        int level = getGsmSignalStrength();
        if (DBG) log("getGsmAsuLevel=" + level);
        return level;
    }

    /**
     * Get cdma as level 0..4
     *
     * @hide
     */
    public int getCdmaLevel() {
        final int cdmaDbm = getCdmaDbm();
        final int cdmaEcio = getCdmaEcio();
        int levelDbm;
        int levelEcio;

        if (cdmaDbm >= -75) levelDbm = SIGNAL_STRENGTH_GREAT;
        else if (cdmaDbm >= -85) levelDbm = SIGNAL_STRENGTH_GOOD;
        else if (cdmaDbm >= -95) levelDbm = SIGNAL_STRENGTH_MODERATE;
        else if (cdmaDbm >= -100) levelDbm = SIGNAL_STRENGTH_POOR;
        else levelDbm = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;

        // Ec/Io are in dB*10
        if (cdmaEcio >= -90) levelEcio = SIGNAL_STRENGTH_GREAT;
        else if (cdmaEcio >= -110) levelEcio = SIGNAL_STRENGTH_GOOD;
        else if (cdmaEcio >= -130) levelEcio = SIGNAL_STRENGTH_MODERATE;
        else if (cdmaEcio >= -150) levelEcio = SIGNAL_STRENGTH_POOR;
        else levelEcio = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;

        int level = (levelDbm < levelEcio) ? levelDbm : levelEcio;
        if (DBG) log("getCdmaLevel=" + level);
        return level;
    }

    /**
     * Get the cdma signal level as an asu value between 0..31, 99 is unknown
     *
     * @hide
     */
    public int getCdmaAsuLevel() {
        final int cdmaDbm = getCdmaDbm();
        final int cdmaEcio = getCdmaEcio();
        int cdmaAsuLevel;
        int ecioAsuLevel;

        if (cdmaDbm >= -75) cdmaAsuLevel = 16;
        else if (cdmaDbm >= -82) cdmaAsuLevel = 8;
        else if (cdmaDbm >= -90) cdmaAsuLevel = 4;
        else if (cdmaDbm >= -95) cdmaAsuLevel = 2;
        else if (cdmaDbm >= -100) cdmaAsuLevel = 1;
        else cdmaAsuLevel = 99;

        // Ec/Io are in dB*10
        if (cdmaEcio >= -90) ecioAsuLevel = 16;
        else if (cdmaEcio >= -100) ecioAsuLevel = 8;
        else if (cdmaEcio >= -115) ecioAsuLevel = 4;
        else if (cdmaEcio >= -130) ecioAsuLevel = 2;
        else if (cdmaEcio >= -150) ecioAsuLevel = 1;
        else ecioAsuLevel = 99;

        int level = (cdmaAsuLevel < ecioAsuLevel) ? cdmaAsuLevel : ecioAsuLevel;
        if (DBG) log("getCdmaAsuLevel=" + level);
        return level;
    }

    /**
     * Get Evdo as level 0..4
     *
     * @hide
     */
    public int getEvdoLevel() {
        int evdoDbm = getEvdoDbm();
        int evdoSnr = getEvdoSnr();
        int levelEvdoDbm;
        int levelEvdoSnr;

        if (evdoDbm >= -65) levelEvdoDbm = SIGNAL_STRENGTH_GREAT;
        else if (evdoDbm >= -75) levelEvdoDbm = SIGNAL_STRENGTH_GOOD;
        else if (evdoDbm >= -90) levelEvdoDbm = SIGNAL_STRENGTH_MODERATE;
        else if (evdoDbm >= -105) levelEvdoDbm = SIGNAL_STRENGTH_POOR;
        else levelEvdoDbm = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;

        if (evdoSnr >= 7) levelEvdoSnr = SIGNAL_STRENGTH_GREAT;
        else if (evdoSnr >= 5) levelEvdoSnr = SIGNAL_STRENGTH_GOOD;
        else if (evdoSnr >= 3) levelEvdoSnr = SIGNAL_STRENGTH_MODERATE;
        else if (evdoSnr >= 1) levelEvdoSnr = SIGNAL_STRENGTH_POOR;
        else levelEvdoSnr = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;

        int level = (levelEvdoDbm < levelEvdoSnr) ? levelEvdoDbm : levelEvdoSnr;
        if (DBG) log("getEvdoLevel=" + level);
        return level;
    }

    /**
     * Get the evdo signal level as an asu value between 0..31, 99 is unknown
     *
     * @hide
     */
    public int getEvdoAsuLevel() {
        int evdoDbm = getEvdoDbm();
        int evdoSnr = getEvdoSnr();
        int levelEvdoDbm;
        int levelEvdoSnr;

        if (evdoDbm >= -65) levelEvdoDbm = 16;
        else if (evdoDbm >= -75) levelEvdoDbm = 8;
        else if (evdoDbm >= -85) levelEvdoDbm = 4;
        else if (evdoDbm >= -95) levelEvdoDbm = 2;
        else if (evdoDbm >= -105) levelEvdoDbm = 1;
        else levelEvdoDbm = 99;

        if (evdoSnr >= 7) levelEvdoSnr = 16;
        else if (evdoSnr >= 6) levelEvdoSnr = 8;
        else if (evdoSnr >= 5) levelEvdoSnr = 4;
        else if (evdoSnr >= 3) levelEvdoSnr = 2;
        else if (evdoSnr >= 1) levelEvdoSnr = 1;
        else levelEvdoSnr = 99;

        int level = (levelEvdoDbm < levelEvdoSnr) ? levelEvdoDbm : levelEvdoSnr;
        if (DBG) log("getEvdoAsuLevel=" + level);
        return level;
    }

    /**
     * Get LTE as dBm
     *
     * @hide
     */
    public int getLteDbm() {
        return mLteRsrp;
    }

    /**
     * Get LTE as level 0..4
     *
     * @hide
     */
    public int getLteLevel() {
        /*
         * TS 36.214 Physical Layer Section 5.1.3 TS 36.331 RRC RSSI = received
         * signal + noise RSRP = reference signal dBm RSRQ = quality of signal
         * dB= Number of Resource blocksxRSRP/RSSI SNR = gain=signal/noise ratio
         * = -10log P1/P2 dB
         */
        int rssiIconLevel = SIGNAL_STRENGTH_NONE_OR_UNKNOWN, rsrpIconLevel = -1, snrIconLevel = -1;

        if (mLteRsrp > -44) rsrpIconLevel = -1;
        else if (mLteRsrp >= -85) rsrpIconLevel = SIGNAL_STRENGTH_GREAT;
        else if (mLteRsrp >= -95) rsrpIconLevel = SIGNAL_STRENGTH_GOOD;
        else if (mLteRsrp >= -105) rsrpIconLevel = SIGNAL_STRENGTH_MODERATE;
        else if (mLteRsrp >= -115) rsrpIconLevel = SIGNAL_STRENGTH_POOR;
        else if (mLteRsrp >= -140) rsrpIconLevel = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;

        /*
         * Values are -200 dB to +300 (SNR*10dB) RS_SNR >= 13.0 dB =>4 bars 4.5
         * dB <= RS_SNR < 13.0 dB => 3 bars 1.0 dB <= RS_SNR < 4.5 dB => 2 bars
         * -3.0 dB <= RS_SNR < 1.0 dB 1 bar RS_SNR < -3.0 dB/No Service Antenna
         * Icon Only
         */
        if (mLteRssnr > 300) snrIconLevel = -1;
        else if (mLteRssnr >= 130) snrIconLevel = SIGNAL_STRENGTH_GREAT;
        else if (mLteRssnr >= 45) snrIconLevel = SIGNAL_STRENGTH_GOOD;
        else if (mLteRssnr >= 10) snrIconLevel = SIGNAL_STRENGTH_MODERATE;
        else if (mLteRssnr >= -30) snrIconLevel = SIGNAL_STRENGTH_POOR;
        else if (mLteRssnr >= -200)
            snrIconLevel = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;

        if (DBG) log("getLTELevel - rsrp:" + mLteRsrp + " snr:" + mLteRssnr + " rsrpIconLevel:"
                + rsrpIconLevel + " snrIconLevel:" + snrIconLevel);

        /* Choose a measurement type to use for notification */
        if (snrIconLevel != -1 && rsrpIconLevel != -1) {
            /*
             * The number of bars displayed shall be the smaller of the bars
             * associated with LTE RSRP and the bars associated with the LTE
             * RS_SNR
             */
            return (rsrpIconLevel < snrIconLevel ? rsrpIconLevel : snrIconLevel);
        }

        if (snrIconLevel != -1) return snrIconLevel;

        if (rsrpIconLevel != -1) return rsrpIconLevel;

        /* Valid values are (0-63, 99) as defined in TS 36.331 */
        if (mLteSignalStrength > 63) rssiIconLevel = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        else if (mLteSignalStrength >= 12) rssiIconLevel = SIGNAL_STRENGTH_GREAT;
        else if (mLteSignalStrength >= 8) rssiIconLevel = SIGNAL_STRENGTH_GOOD;
        else if (mLteSignalStrength >= 5) rssiIconLevel = SIGNAL_STRENGTH_MODERATE;
        else if (mLteSignalStrength >= 0) rssiIconLevel = SIGNAL_STRENGTH_POOR;
        if (DBG) log("getLTELevel - rssi:" + mLteSignalStrength + " rssiIconLevel:"
                + rssiIconLevel);
        return rssiIconLevel;

    }
    /**
     * Get the LTE signal level as an asu value between 0..97, 99 is unknown
     * Asu is calculated based on 3GPP RSRP. Refer to 3GPP 27.007 (Ver 10.3.0) Sec 8.69
     *
     * @hide
     */
    public int getLteAsuLevel() {
        int lteAsuLevel = 99;
        int lteDbm = getLteDbm();
        /*
         * 3GPP 27.007 (Ver 10.3.0) Sec 8.69
         * 0   -140 dBm or less
         * 1   -139 dBm
         * 2...96  -138... -44 dBm
         * 97  -43 dBm or greater
         * 255 not known or not detectable
         */
        /*
         * validateInput will always give a valid range between -140 t0 -44 as
         * per ril.h. so RSRP >= -43 & <-140 will fall under asu level 255
         * and not 97 or 0
         */
        if (lteDbm == SignalStrength.INVALID) lteAsuLevel = 255;
        else lteAsuLevel = lteDbm + 140;
        if (DBG) log("Lte Asu level: "+lteAsuLevel);
        return lteAsuLevel;
    }

    /**
     * @return true if this is for GSM
     */
    public boolean isGsm() {
        return this.isGsm;
    }

    /**
     * @return hash code
     */
    @Override
    public int hashCode() {
        int primeNum = 31;
        return ((mGsmSignalStrength * primeNum)
                + (mGsmBitErrorRate * primeNum)
                + (mCdmaDbm * primeNum) + (mCdmaEcio * primeNum)
                + (mEvdoDbm * primeNum) + (mEvdoEcio * primeNum) + (mEvdoSnr * primeNum)
                + (mLteSignalStrength * primeNum) + (mLteRsrp * primeNum)
                + (mLteRsrq * primeNum) + (mLteRssnr * primeNum) + (mLteCqi * primeNum)
                + (isGsm ? 1 : 0));
    }

    /**
     * @return true if the signal strengths are the same
     */
    @Override
    public boolean equals (Object o) {
        SignalStrength s;

        try {
            s = (SignalStrength) o;
        } catch (ClassCastException ex) {
            return false;
        }

        if (o == null) {
            return false;
        }

        return (mGsmSignalStrength == s.mGsmSignalStrength
                && mGsmBitErrorRate == s.mGsmBitErrorRate
                && mCdmaDbm == s.mCdmaDbm
                && mCdmaEcio == s.mCdmaEcio
                && mEvdoDbm == s.mEvdoDbm
                && mEvdoEcio == s.mEvdoEcio
                && mEvdoSnr == s.mEvdoSnr
                && mLteSignalStrength == s.mLteSignalStrength
                && mLteRsrp == s.mLteRsrp
                && mLteRsrq == s.mLteRsrq
                && mLteRssnr == s.mLteRssnr
                && mLteCqi == s.mLteCqi
                && isGsm == s.isGsm);
    }

    /**
     * @return string representation.
     */
    @Override
    public String toString() {
        return ("SignalStrength:"
                + " " + mGsmSignalStrength
                + " " + mGsmBitErrorRate
                + " " + mCdmaDbm
                + " " + mCdmaEcio
                + " " + mEvdoDbm
                + " " + mEvdoEcio
                + " " + mEvdoSnr
                + " " + mLteSignalStrength
                + " " + mLteRsrp
                + " " + mLteRsrq
                + " " + mLteRssnr
                + " " + mLteCqi
                + " " + (isGsm ? "gsm|lte" : "cdma"));
    }

    /**
     * Set SignalStrength based on intent notifier map
     *
     * @param m intent notifier map
     * @hide
     */
    private void setFromNotifierBundle(Bundle m) {
        mGsmSignalStrength = m.getInt("GsmSignalStrength");
        mGsmBitErrorRate = m.getInt("GsmBitErrorRate");
        mCdmaDbm = m.getInt("CdmaDbm");
        mCdmaEcio = m.getInt("CdmaEcio");
        mEvdoDbm = m.getInt("EvdoDbm");
        mEvdoEcio = m.getInt("EvdoEcio");
        mEvdoSnr = m.getInt("EvdoSnr");
        mLteSignalStrength = m.getInt("LteSignalStrength");
        mLteRsrp = m.getInt("LteRsrp");
        mLteRsrq = m.getInt("LteRsrq");
        mLteRssnr = m.getInt("LteRssnr");
        mLteCqi = m.getInt("LteCqi");
        isGsm = m.getBoolean("isGsm");
    }

    /**
     * Set intent notifier Bundle based on SignalStrength
     *
     * @param m intent notifier Bundle
     * @hide
     */
    public void fillInNotifierBundle(Bundle m) {
        m.putInt("GsmSignalStrength", mGsmSignalStrength);
        m.putInt("GsmBitErrorRate", mGsmBitErrorRate);
        m.putInt("CdmaDbm", mCdmaDbm);
        m.putInt("CdmaEcio", mCdmaEcio);
        m.putInt("EvdoDbm", mEvdoDbm);
        m.putInt("EvdoEcio", mEvdoEcio);
        m.putInt("EvdoSnr", mEvdoSnr);
        m.putInt("LteSignalStrength", mLteSignalStrength);
        m.putInt("LteRsrp", mLteRsrp);
        m.putInt("LteRsrq", mLteRsrq);
        m.putInt("LteRssnr", mLteRssnr);
        m.putInt("LteCqi", mLteCqi);
        m.putBoolean("isGsm", Boolean.valueOf(isGsm));
    }

    /**
     * log
     */
    private static void log(String s) {
        Log.w(LOG_TAG, s);
    }
}