/*
 * 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;
import android.content.res.Resources;

/**
 * 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 int mLteRsrpBoost; // offset to be reduced from the rsrp threshold while calculating
                                // signal strength level
    private int mTdScdmaRscp;

    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;
        mLteRsrpBoost = 0;
        mTdScdmaRscp = 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;
        mLteRsrpBoost = 0;
        mTdScdmaRscp = 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,
            int lteRsrpBoost, int tdScdmaRscp, boolean gsmFlag) {
        initialize(gsmSignalStrength, gsmBitErrorRate, cdmaDbm, cdmaEcio,
                evdoDbm, evdoEcio, evdoSnr, lteSignalStrength, lteRsrp,
                lteRsrq, lteRssnr, lteCqi, lteRsrpBoost, gsmFlag);
        mTdScdmaRscp = tdScdmaRscp;
    }

    /**
     * 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,
            int tdScdmaRscp, boolean gsmFlag) {
        initialize(gsmSignalStrength, gsmBitErrorRate, cdmaDbm, cdmaEcio,
                evdoDbm, evdoEcio, evdoSnr, lteSignalStrength, lteRsrp,
                lteRsrq, lteRssnr, lteCqi, 0, gsmFlag);
        mTdScdmaRscp = tdScdmaRscp;
    }

    /**
     * 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, 0, 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, 0, 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, 0, 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 lteRsrpBoost
     * @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,
            int lteRsrpBoost, 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;
        mLteRsrpBoost = lteRsrpBoost;
        mTdScdmaRscp = INVALID;
        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;
        mLteRsrpBoost = s.mLteRsrpBoost;
        mTdScdmaRscp = s.mTdScdmaRscp;
        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();
        mLteRsrpBoost = in.readInt();
        mTdScdmaRscp = in.readInt();
        isGsm = (in.readInt() != 0);
    }

    /**
     * Make a SignalStrength object from the given parcel as passed up by
     * the ril which does not have isGsm. isGsm will be changed by ServiceStateTracker
     * so the default is a don't care.
     *
     * @hide
     */
    public static SignalStrength makeSignalStrengthFromRilParcel(Parcel in) {
        if (DBG) log("Size of signalstrength parcel:" + in.dataSize());

        SignalStrength ss = new SignalStrength();
        ss.mGsmSignalStrength = in.readInt();
        ss.mGsmBitErrorRate = in.readInt();
        ss.mCdmaDbm = in.readInt();
        ss.mCdmaEcio = in.readInt();
        ss.mEvdoDbm = in.readInt();
        ss.mEvdoEcio = in.readInt();
        ss.mEvdoSnr = in.readInt();
        ss.mLteSignalStrength = in.readInt();
        ss.mLteRsrp = in.readInt();
        ss.mLteRsrq = in.readInt();
        ss.mLteRssnr = in.readInt();
        ss.mLteCqi = in.readInt();
        ss.mTdScdmaRscp = in.readInt();
        return ss;
    }

    /**
     * {@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(mLteRsrpBoost);
        out.writeInt(mTdScdmaRscp);
        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;

        mTdScdmaRscp = ((mTdScdmaRscp >= 25) && (mTdScdmaRscp <= 120))
                ? -mTdScdmaRscp : SignalStrength.INVALID;
        // Cqi no change
        if (DBG) log("Signal after validate=" + this);
    }

    /**
     * Fix {@link #isGsm} based on the signal strength data.
     *
     * @hide
     */
    public void fixType() {
        isGsm = getCdmaRelatedSignalStrength() == SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
    }

    /**
     * @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;
    }

    /**
     * @param lteRsrpBoost - signal strength offset
     *
     * Used by phone to set the lte signal strength offset which will be
     * reduced from rsrp threshold while calculating signal strength level
     *
     * @hide
     */
    public void setLteRsrpBoost(int lteRsrpBoost) {
        mLteRsrpBoost = lteRsrpBoost;
    }

    /**
     * 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 getLteSignalStrength() {
        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;
    }

    /** @hide */
    public int getLteRsrpBoost() {
        return mLteRsrpBoost;
    }

    /**
     * Retrieve an abstract level value for the overall signal strength.
     *
     * @return a single integer from 0 to 4 representing the general signal quality.
     *     This may take into account many different radio technology inputs.
     *     0 represents very poor signal strength
     *     while 4 represents a very strong signal strength.
     */
    public int getLevel() {
        int level = isGsm ? getGsmRelatedSignalStrength() : getCdmaRelatedSignalStrength();
        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 = 0;
        if (isGsm) {
            if (getLteLevel() == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                if (getTdScdmaLevel() == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                    asuLevel = getGsmAsuLevel();
                } else {
                    asuLevel = getTdScdmaAsuLevel();
                }
            } 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 = INVALID;

        if(isGsm()) {
            dBm = getLteDbm();
            if (dBm == INVALID) {
                if (getTdScdmaLevel() == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                    dBm = getGsmDbm();
                } else {
                    dBm = getTdScdmaDbm();
                }
            }
        } 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;

        int[] threshRsrp = Resources.getSystem().getIntArray(
                com.android.internal.R.array.config_lteDbmThresholds);
        if (threshRsrp.length != 6) {
            Log.wtf(LOG_TAG, "getLteLevel - config_lteDbmThresholds has invalid num of elements."
                    + " Cannot evaluate RSRP signal.");
        } else {
            if (mLteRsrp > threshRsrp[5]) {
                rsrpIconLevel = -1;
            } else if (mLteRsrp >= (threshRsrp[4] - mLteRsrpBoost)) {
                rsrpIconLevel = SIGNAL_STRENGTH_GREAT;
            } else if (mLteRsrp >= (threshRsrp[3] - mLteRsrpBoost)) {
                rsrpIconLevel = SIGNAL_STRENGTH_GOOD;
            } else if (mLteRsrp >= (threshRsrp[2] - mLteRsrpBoost)) {
                rsrpIconLevel = SIGNAL_STRENGTH_MODERATE;
            } else if (mLteRsrp >= (threshRsrp[1] - mLteRsrpBoost)) {
                rsrpIconLevel = SIGNAL_STRENGTH_POOR;
            } else if (mLteRsrp >= threshRsrp[0]) {
                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
                + " lteRsrpBoost:" + mLteRsrpBoost);

        /* 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 get TD_SCDMA dbm
     *
     * @hide
     */
    public int getTdScdmaDbm() {
        return this.mTdScdmaRscp;
    }

    /**
     * Get TD-SCDMA as level 0..4
     * Range : 25 to 120
     * INT_MAX: 0x7FFFFFFF denotes invalid value
     * Reference: 3GPP TS 25.123, section 9.1.1.1
     *
     * @hide
     */
    public int getTdScdmaLevel() {
        final int tdScdmaDbm = getTdScdmaDbm();
        int level;

        if ((tdScdmaDbm > -25) || (tdScdmaDbm == SignalStrength.INVALID))
                level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        else if (tdScdmaDbm >= -49) level = SIGNAL_STRENGTH_GREAT;
        else if (tdScdmaDbm >= -73) level = SIGNAL_STRENGTH_GOOD;
        else if (tdScdmaDbm >= -97) level = SIGNAL_STRENGTH_MODERATE;
        else if (tdScdmaDbm >= -110) level = SIGNAL_STRENGTH_POOR;
        else level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;

        if (DBG) log("getTdScdmaLevel = " + level);
        return level;
     }

    /**
     * Get the TD-SCDMA signal level as an asu value.
     *
     * @hide
     */
    public int getTdScdmaAsuLevel() {
        final int tdScdmaDbm = getTdScdmaDbm();
        int tdScdmaAsuLevel;

        if (tdScdmaDbm == INVALID) tdScdmaAsuLevel = 255;
        else tdScdmaAsuLevel = tdScdmaDbm + 120;
        if (DBG) log("TD-SCDMA Asu level: " + tdScdmaAsuLevel);
        return tdScdmaAsuLevel;
    }

   /**
     * @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)
                + (mLteRsrpBoost * primeNum) + (mTdScdmaRscp * 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
                && mLteRsrpBoost == s.mLteRsrpBoost
                && mTdScdmaRscp == s.mTdScdmaRscp
                && isGsm == s.isGsm);
    }

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

    /** Returns the signal strength related to GSM. */
    private int getGsmRelatedSignalStrength() {
        int level = getLteLevel();
        if (level == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
            level = getTdScdmaLevel();
            if (level == SIGNAL_STRENGTH_NONE_OR_UNKNOWN) {
                level = getGsmLevel();
            }
        }
        return level;
    }

    /** Returns the signal strength related to CDMA. */
    private int getCdmaRelatedSignalStrength() {
        int level;
        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;
        }
        return level;
    }

    /**
     * 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");
        mLteRsrpBoost = m.getInt("lteRsrpBoost");
        mTdScdmaRscp = m.getInt("TdScdma");
        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.putInt("lteRsrpBoost", mLteRsrpBoost);
        m.putInt("TdScdma", mTdScdmaRscp);
        m.putBoolean("isGsm", isGsm);
    }

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