/*
 * Copyright (C) 2014 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.bluetooth.le;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.bluetooth.Attributable;
import android.bluetooth.BluetoothDevice;
import android.content.AttributionSource;
import android.os.Parcel;
import android.os.Parcelable;

import java.util.Objects;

/** ScanResult for Bluetooth LE scan. */
public final class ScanResult implements Parcelable, Attributable {

    /**
     * For chained advertisements, indicates that the data contained in this scan result is
     * complete.
     */
    public static final int DATA_COMPLETE = 0x00;

    /**
     * For chained advertisements, indicates that the controller was unable to receive all chained
     * packets and the scan result contains incomplete truncated data.
     */
    public static final int DATA_TRUNCATED = 0x02;

    /** Indicates that the secondary physical layer was not used. */
    public static final int PHY_UNUSED = 0x00;

    /** Advertising Set ID is not present in the packet. */
    public static final int SID_NOT_PRESENT = 0xFF;

    /** TX power is not present in the packet. */
    public static final int TX_POWER_NOT_PRESENT = 0x7F;

    /** Periodic advertising interval is not present in the packet. */
    public static final int PERIODIC_INTERVAL_NOT_PRESENT = 0x00;

    /** Mask for checking whether event type represents legacy advertisement. */
    private static final int ET_LEGACY_MASK = 0x10;

    /** Mask for checking whether event type represents connectable advertisement. */
    private static final int ET_CONNECTABLE_MASK = 0x01;

    // Remote Bluetooth device.
    private BluetoothDevice mDevice;

    // Scan record, including advertising data and scan response data.
    @Nullable private ScanRecord mScanRecord;

    // Received signal strength.
    private int mRssi;

    // Device timestamp when the result was last seen.
    private long mTimestampNanos;

    private int mEventType;
    private int mPrimaryPhy;
    private int mSecondaryPhy;
    private int mAdvertisingSid;
    private int mTxPower;
    private int mPeriodicAdvertisingInterval;

    /**
     * Constructs a new ScanResult.
     *
     * @param device Remote Bluetooth device found.
     * @param scanRecord Scan record including both advertising data and scan response data.
     * @param rssi Received signal strength.
     * @param timestampNanos Timestamp at which the scan result was observed.
     * @deprecated use {@link #ScanResult(BluetoothDevice, int, int, int, int, int, int, int,
     *     ScanRecord, long)}
     */
    @Deprecated
    public ScanResult(
            BluetoothDevice device, ScanRecord scanRecord, int rssi, long timestampNanos) {
        mDevice = device;
        mScanRecord = scanRecord;
        mRssi = rssi;
        mTimestampNanos = timestampNanos;
        mEventType = (DATA_COMPLETE << 5) | ET_LEGACY_MASK | ET_CONNECTABLE_MASK;
        mPrimaryPhy = BluetoothDevice.PHY_LE_1M;
        mSecondaryPhy = PHY_UNUSED;
        mAdvertisingSid = SID_NOT_PRESENT;
        mTxPower = 127;
        mPeriodicAdvertisingInterval = 0;
    }

    /**
     * Constructs a new ScanResult.
     *
     * @param device Remote Bluetooth device found.
     * @param eventType Event type.
     * @param primaryPhy Primary advertising phy.
     * @param secondaryPhy Secondary advertising phy.
     * @param advertisingSid Advertising set ID.
     * @param txPower Transmit power.
     * @param rssi Received signal strength.
     * @param periodicAdvertisingInterval Periodic advertising interval.
     * @param scanRecord Scan record including both advertising data and scan response data.
     * @param timestampNanos Timestamp at which the scan result was observed.
     */
    public ScanResult(
            BluetoothDevice device,
            int eventType,
            int primaryPhy,
            int secondaryPhy,
            int advertisingSid,
            int txPower,
            int rssi,
            int periodicAdvertisingInterval,
            ScanRecord scanRecord,
            long timestampNanos) {
        mDevice = device;
        mEventType = eventType;
        mPrimaryPhy = primaryPhy;
        mSecondaryPhy = secondaryPhy;
        mAdvertisingSid = advertisingSid;
        mTxPower = txPower;
        mRssi = rssi;
        mPeriodicAdvertisingInterval = periodicAdvertisingInterval;
        mScanRecord = scanRecord;
        mTimestampNanos = timestampNanos;
    }

    private ScanResult(Parcel in) {
        readFromParcel(in);
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        if (mDevice != null) {
            dest.writeInt(1);
            mDevice.writeToParcel(dest, flags);
        } else {
            dest.writeInt(0);
        }
        if (mScanRecord != null) {
            dest.writeInt(1);
            dest.writeByteArray(mScanRecord.getBytes());
        } else {
            dest.writeInt(0);
        }
        dest.writeInt(mRssi);
        dest.writeLong(mTimestampNanos);
        dest.writeInt(mEventType);
        dest.writeInt(mPrimaryPhy);
        dest.writeInt(mSecondaryPhy);
        dest.writeInt(mAdvertisingSid);
        dest.writeInt(mTxPower);
        dest.writeInt(mPeriodicAdvertisingInterval);
    }

    private void readFromParcel(Parcel in) {
        if (in.readInt() == 1) {
            mDevice = BluetoothDevice.CREATOR.createFromParcel(in);
        }
        if (in.readInt() == 1) {
            mScanRecord = ScanRecord.parseFromBytes(in.createByteArray());
        }
        mRssi = in.readInt();
        mTimestampNanos = in.readLong();
        mEventType = in.readInt();
        mPrimaryPhy = in.readInt();
        mSecondaryPhy = in.readInt();
        mAdvertisingSid = in.readInt();
        mTxPower = in.readInt();
        mPeriodicAdvertisingInterval = in.readInt();
    }

    @Override
    public int describeContents() {
        return 0;
    }

    /** @hide */
    public void setAttributionSource(@NonNull AttributionSource attributionSource) {
        Attributable.setAttributionSource(mDevice, attributionSource);
    }

    /**
     * Returns the remote Bluetooth device identified by the Bluetooth device address. If the device
     * is bonded, calling {@link BluetoothDevice#getAddress} on the object returned by this method
     * will return the address that was originally bonded with (either identity address or random
     * address).
     */
    public BluetoothDevice getDevice() {
        return mDevice;
    }

    /** Returns the scan record, which is a combination of advertisement and scan response. */
    @Nullable
    public ScanRecord getScanRecord() {
        return mScanRecord;
    }

    /** Returns the received signal strength in dBm. The valid range is [-127, 126]. */
    public int getRssi() {
        return mRssi;
    }

    /** Returns timestamp since boot when the scan record was observed. */
    public long getTimestampNanos() {
        return mTimestampNanos;
    }

    /**
     * Returns true if this object represents legacy scan result. Legacy scan results do not contain
     * advanced advertising information as specified in the Bluetooth Core Specification v5.
     */
    public boolean isLegacy() {
        return (mEventType & ET_LEGACY_MASK) != 0;
    }

    /** Returns true if this object represents connectable scan result. */
    public boolean isConnectable() {
        return (mEventType & ET_CONNECTABLE_MASK) != 0;
    }

    /**
     * Returns the data status. Can be one of {@link ScanResult#DATA_COMPLETE} or {@link
     * ScanResult#DATA_TRUNCATED}.
     */
    public int getDataStatus() {
        // return bit 5 and 6
        return (mEventType >> 5) & 0x03;
    }

    /**
     * Returns the primary Physical Layer on which this advertisement was received. Can be one of
     * {@link BluetoothDevice#PHY_LE_1M} or {@link BluetoothDevice#PHY_LE_CODED}.
     */
    public int getPrimaryPhy() {
        return mPrimaryPhy;
    }

    /**
     * Returns the secondary Physical Layer on which this advertisement was received. Can be one of
     * {@link BluetoothDevice#PHY_LE_1M}, {@link BluetoothDevice#PHY_LE_2M}, {@link
     * BluetoothDevice#PHY_LE_CODED} or {@link ScanResult#PHY_UNUSED} - if the advertisement was not
     * received on a secondary physical channel.
     */
    public int getSecondaryPhy() {
        return mSecondaryPhy;
    }

    /**
     * Returns the advertising set id. May return {@link ScanResult#SID_NOT_PRESENT} if no set id
     * was is present.
     */
    public int getAdvertisingSid() {
        return mAdvertisingSid;
    }

    /**
     * Returns the transmit power in dBm. Valid range is [-127, 126]. A value of {@link
     * ScanResult#TX_POWER_NOT_PRESENT} indicates that the TX power is not present.
     */
    public int getTxPower() {
        return mTxPower;
    }

    /**
     * Returns the periodic advertising interval in units of 1.25ms. Valid range is 6 (7.5ms) to
     * 65536 (81918.75ms). A value of {@link ScanResult#PERIODIC_INTERVAL_NOT_PRESENT} means
     * periodic advertising interval is not present.
     */
    public int getPeriodicAdvertisingInterval() {
        return mPeriodicAdvertisingInterval;
    }

    @Override
    public int hashCode() {
        return Objects.hash(
                mDevice,
                mRssi,
                mScanRecord,
                mTimestampNanos,
                mEventType,
                mPrimaryPhy,
                mSecondaryPhy,
                mAdvertisingSid,
                mTxPower,
                mPeriodicAdvertisingInterval);
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        ScanResult other = (ScanResult) obj;
        return Objects.equals(mDevice, other.mDevice)
                && (mRssi == other.mRssi)
                && Objects.equals(mScanRecord, other.mScanRecord)
                && (mTimestampNanos == other.mTimestampNanos)
                && mEventType == other.mEventType
                && mPrimaryPhy == other.mPrimaryPhy
                && mSecondaryPhy == other.mSecondaryPhy
                && mAdvertisingSid == other.mAdvertisingSid
                && mTxPower == other.mTxPower
                && mPeriodicAdvertisingInterval == other.mPeriodicAdvertisingInterval;
    }

    @Override
    public String toString() {
        return "ScanResult{"
                + "device="
                + mDevice
                + ", scanRecord="
                + Objects.toString(mScanRecord)
                + ", rssi="
                + mRssi
                + ", timestampNanos="
                + mTimestampNanos
                + ", eventType="
                + mEventType
                + ", primaryPhy="
                + mPrimaryPhy
                + ", secondaryPhy="
                + mSecondaryPhy
                + ", advertisingSid="
                + mAdvertisingSid
                + ", txPower="
                + mTxPower
                + ", periodicAdvertisingInterval="
                + mPeriodicAdvertisingInterval
                + '}';
    }

    public static final @android.annotation.NonNull Parcelable.Creator<ScanResult> CREATOR =
            new Creator<ScanResult>() {
                @Override
                public ScanResult createFromParcel(Parcel source) {
                    return new ScanResult(source);
                }

                @Override
                public ScanResult[] newArray(int size) {
                    return new ScanResult[size];
                }
            };
}