/*
 * 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.SystemApi;
import android.bluetooth.le.AdvertisingSetParameters.AddressTypeStatus;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.Log;

/**
 * The {@link AdvertiseSettings} provide a way to adjust advertising preferences for each Bluetooth
 * LE advertisement instance. Use {@link AdvertiseSettings.Builder} to create an instance of this
 * class.
 */
public final class AdvertiseSettings implements Parcelable {
    private static final String TAG = AdvertiseSettings.class.getSimpleName();

    /**
     * Perform Bluetooth LE advertising in low power mode. This is the default and preferred
     * advertising mode as it consumes the least power.
     */
    public static final int ADVERTISE_MODE_LOW_POWER = 0;

    /**
     * Perform Bluetooth LE advertising in balanced power mode. This is balanced between advertising
     * frequency and power consumption.
     */
    public static final int ADVERTISE_MODE_BALANCED = 1;

    /**
     * Perform Bluetooth LE advertising in low latency, high power mode. This has the highest power
     * consumption and should not be used for continuous background advertising.
     */
    public static final int ADVERTISE_MODE_LOW_LATENCY = 2;

    /**
     * Advertise using the lowest transmission (TX) power level. Low transmission power can be used
     * to restrict the visibility range of advertising packets.
     */
    public static final int ADVERTISE_TX_POWER_ULTRA_LOW = 0;

    /** Advertise using low TX power level. */
    public static final int ADVERTISE_TX_POWER_LOW = 1;

    /** Advertise using medium TX power level. */
    public static final int ADVERTISE_TX_POWER_MEDIUM = 2;

    /**
     * Advertise using high TX power level. This corresponds to largest visibility range of the
     * advertising packet.
     */
    public static final int ADVERTISE_TX_POWER_HIGH = 3;

    /** The maximum limited advertisement duration as specified by the Bluetooth SIG */
    private static final int LIMITED_ADVERTISING_MAX_MILLIS = 180 * 1000;

    private final int mAdvertiseMode;
    private final int mAdvertiseTxPowerLevel;
    private final int mAdvertiseTimeoutMillis;
    private final boolean mAdvertiseConnectable;
    private final boolean mAdvertiseDiscoverable;
    private final int mOwnAddressType;

    private AdvertiseSettings(
            int advertiseMode,
            int advertiseTxPowerLevel,
            boolean advertiseConnectable,
            boolean discoverable,
            int advertiseTimeout,
            @AddressTypeStatus int ownAddressType) {
        mAdvertiseMode = advertiseMode;
        mAdvertiseTxPowerLevel = advertiseTxPowerLevel;
        mAdvertiseConnectable = advertiseConnectable;
        mAdvertiseDiscoverable = discoverable;
        mAdvertiseTimeoutMillis = advertiseTimeout;
        mOwnAddressType = ownAddressType;
    }

    private AdvertiseSettings(Parcel in) {
        mAdvertiseMode = in.readInt();
        mAdvertiseTxPowerLevel = in.readInt();
        mAdvertiseConnectable = in.readInt() != 0;
        mAdvertiseTimeoutMillis = in.readInt();
        mOwnAddressType = in.readInt();
        mAdvertiseDiscoverable = in.readInt() != 0;
    }

    /** Returns the advertise mode. */
    public int getMode() {
        return mAdvertiseMode;
    }

    /** Returns the TX power level for advertising. */
    public int getTxPowerLevel() {
        return mAdvertiseTxPowerLevel;
    }

    /** Returns whether the advertisement will indicate connectable. */
    public boolean isConnectable() {
        return mAdvertiseConnectable;
    }

    /** Returns whether the advertisement will be discoverable. */
    public boolean isDiscoverable() {
        return mAdvertiseDiscoverable;
    }

    /** Returns the advertising time limit in milliseconds. */
    public int getTimeout() {
        return mAdvertiseTimeoutMillis;
    }

    /**
     * @return the own address type for advertising
     * @hide
     */
    @SystemApi
    public @AddressTypeStatus int getOwnAddressType() {
        return mOwnAddressType;
    }

    @Override
    public String toString() {
        return "Settings [mAdvertiseMode="
                + mAdvertiseMode
                + ", mAdvertiseTxPowerLevel="
                + mAdvertiseTxPowerLevel
                + ", mAdvertiseConnectable="
                + mAdvertiseConnectable
                + ", mAdvertiseDiscoverable="
                + mAdvertiseDiscoverable
                + ", mAdvertiseTimeoutMillis="
                + mAdvertiseTimeoutMillis
                + ", mOwnAddressType="
                + mOwnAddressType
                + "]";
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(mAdvertiseMode);
        dest.writeInt(mAdvertiseTxPowerLevel);
        dest.writeInt(mAdvertiseConnectable ? 1 : 0);
        dest.writeInt(mAdvertiseTimeoutMillis);
        dest.writeInt(mOwnAddressType);
        dest.writeInt(mAdvertiseDiscoverable ? 1 : 0);
    }

    public static final @android.annotation.NonNull Parcelable.Creator<AdvertiseSettings> CREATOR =
            new Creator<AdvertiseSettings>() {
                @Override
                public AdvertiseSettings[] newArray(int size) {
                    return new AdvertiseSettings[size];
                }

                @Override
                public AdvertiseSettings createFromParcel(Parcel in) {
                    return new AdvertiseSettings(in);
                }
            };

    /** Builder class for {@link AdvertiseSettings}. */
    public static final class Builder {
        private int mMode = ADVERTISE_MODE_LOW_POWER;
        private int mTxPowerLevel = ADVERTISE_TX_POWER_MEDIUM;
        private int mTimeoutMillis = 0;
        private boolean mConnectable = true;
        private boolean mDiscoverable = true;
        private int mOwnAddressType = AdvertisingSetParameters.ADDRESS_TYPE_DEFAULT;

        /**
         * Set advertise mode to control the advertising power and latency.
         *
         * @param advertiseMode Bluetooth LE Advertising mode, can only be one of {@link
         *     AdvertiseSettings#ADVERTISE_MODE_LOW_POWER}, {@link
         *     AdvertiseSettings#ADVERTISE_MODE_BALANCED}, or {@link
         *     AdvertiseSettings#ADVERTISE_MODE_LOW_LATENCY}.
         * @throws IllegalArgumentException If the advertiseMode is invalid.
         */
        public Builder setAdvertiseMode(int advertiseMode) {
            if (advertiseMode < ADVERTISE_MODE_LOW_POWER
                    || advertiseMode > ADVERTISE_MODE_LOW_LATENCY) {
                throw new IllegalArgumentException("unknown mode " + advertiseMode);
            }
            mMode = advertiseMode;
            return this;
        }

        /**
         * Set advertise TX power level to control the transmission power level for the advertising.
         *
         * @param txPowerLevel Transmission power of Bluetooth LE Advertising, can only be one of
         *     {@link AdvertiseSettings#ADVERTISE_TX_POWER_ULTRA_LOW}, {@link
         *     AdvertiseSettings#ADVERTISE_TX_POWER_LOW}, {@link
         *     AdvertiseSettings#ADVERTISE_TX_POWER_MEDIUM} or {@link
         *     AdvertiseSettings#ADVERTISE_TX_POWER_HIGH}.
         * @throws IllegalArgumentException If the {@code txPowerLevel} is invalid.
         */
        public Builder setTxPowerLevel(int txPowerLevel) {
            if (txPowerLevel < ADVERTISE_TX_POWER_ULTRA_LOW
                    || txPowerLevel > ADVERTISE_TX_POWER_HIGH) {
                throw new IllegalArgumentException("unknown tx power level " + txPowerLevel);
            }
            Log.d(TAG, "setTxPowerLevel: " + txPowerLevel);
            mTxPowerLevel = txPowerLevel;
            return this;
        }

        /**
         * Set whether the advertisement type should be connectable or non-connectable.
         *
         * @param connectable Controls whether the advertisement type will be connectable (true) or
         *     non-connectable (false).
         */
        public Builder setConnectable(boolean connectable) {
            mConnectable = connectable;
            return this;
        }

        /**
         * Set whether the advertisement type should be discoverable or non-discoverable.
         *
         * @param discoverable Controls whether the advertisement type will be discoverable ({@code
         *     true}) or non-discoverable ({@code false}).
         */
        public @NonNull Builder setDiscoverable(boolean discoverable) {
            mDiscoverable = discoverable;
            return this;
        }

        /**
         * Limit advertising to a given amount of time.
         *
         * @param timeoutMillis Advertising time limit. May not exceed 180000 milliseconds. A value
         *     of 0 will disable the time limit.
         * @throws IllegalArgumentException If the provided timeout is over 180000 ms.
         */
        public Builder setTimeout(int timeoutMillis) {
            if (timeoutMillis < 0 || timeoutMillis > LIMITED_ADVERTISING_MAX_MILLIS) {
                throw new IllegalArgumentException(
                        "timeoutMillis invalid (must be 0-"
                                + LIMITED_ADVERTISING_MAX_MILLIS
                                + " milliseconds)");
            }
            mTimeoutMillis = timeoutMillis;
            return this;
        }

        /**
         * Set own address type for advertising to control public or privacy mode. If used to set
         * address type anything other than {@link AdvertisingSetParameters#ADDRESS_TYPE_DEFAULT},
         * then it will require BLUETOOTH_PRIVILEGED permission and will be checked at the time of
         * starting advertising.
         *
         * @throws IllegalArgumentException If the {@code ownAddressType} is invalid
         * @hide
         */
        @SystemApi
        public @NonNull Builder setOwnAddressType(@AddressTypeStatus int ownAddressType) {
            if (ownAddressType < AdvertisingSetParameters.ADDRESS_TYPE_DEFAULT
                    || ownAddressType
                            > AdvertisingSetParameters.ADDRESS_TYPE_RANDOM_NON_RESOLVABLE) {
                throw new IllegalArgumentException("unknown address type " + ownAddressType);
            }
            mOwnAddressType = ownAddressType;
            return this;
        }

        /** Build the {@link AdvertiseSettings} object. */
        public AdvertiseSettings build() {
            return new AdvertiseSettings(
                    mMode,
                    mTxPowerLevel,
                    mConnectable,
                    mDiscoverable,
                    mTimeoutMillis,
                    mOwnAddressType);
        }
    }
}