/*
 * Copyright (C) 2020 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 com.android.server.wifi;

import android.content.Context;

import com.android.wifi.resources.R;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

import javax.annotation.concurrent.ThreadSafe;


/** Global wifi service in-memory state that is not persisted. */
@ThreadSafe
public class WifiGlobals {

    /**
     * Maximum allowable interval in milliseconds between polling for RSSI and linkspeed
     * information. This is also used as the polling interval for WifiTrafficPoller, which updates
     * its data activity on every CMD_RSSI_POLL.
     */
    private static final int MAXIMUM_POLL_RSSI_INTERVAL_MSECS = 6000;

    private final Context mContext;

    private final AtomicInteger mPollRssiIntervalMillis = new AtomicInteger(-1);
    private final AtomicBoolean mIpReachabilityDisconnectEnabled = new AtomicBoolean(true);
    private final AtomicBoolean mIsBluetoothConnected = new AtomicBoolean(false);

    // This is read from the overlay, cache it after boot up.
    private final boolean mIsWpa3SaeUpgradeEnabled;
    // This is read from the overlay, cache it after boot up.
    private final boolean mIsWpa3SaeUpgradeOffloadEnabled;
    // This is read from the overlay, cache it after boot up.
    private final boolean mIsOweUpgradeEnabled;
    // This is read from the overlay, cache it after boot up.
    private final boolean mFlushAnqpCacheOnWifiToggleOffEvent;
    // This is read from the overlay, cache it after boot up.
    private final boolean mIsWpa3SaeH2eSupported;
    // This is read from the overlay, cache it after boot up.
    private final String mP2pDeviceNamePrefix;
    // This is read from the overlay, cache it after boot up.
    private final int mP2pDeviceNamePostfixNumDigits;
    // This is read from the overlay, cache it after boot up.
    private final int mClientModeImplNumLogRecs;

    // This is set by WifiManager#setVerboseLoggingEnabled(int).
    private boolean mIsShowKeyVerboseLoggingModeEnabled = false;

    public WifiGlobals(Context context) {
        mContext = context;

        mIsWpa3SaeUpgradeEnabled = mContext.getResources()
                .getBoolean(R.bool.config_wifiSaeUpgradeEnabled);
        mIsWpa3SaeUpgradeOffloadEnabled = mContext.getResources()
                .getBoolean(R.bool.config_wifiSaeUpgradeOffloadEnabled);
        mIsOweUpgradeEnabled = mContext.getResources()
                .getBoolean(R.bool.config_wifiOweUpgradeEnabled);
        mFlushAnqpCacheOnWifiToggleOffEvent = mContext.getResources()
                .getBoolean(R.bool.config_wifiFlushAnqpCacheOnWifiToggleOffEvent);
        mIsWpa3SaeH2eSupported = mContext.getResources()
                .getBoolean(R.bool.config_wifiSaeH2eSupported);
        mP2pDeviceNamePrefix = mContext.getResources()
                .getString(R.string.config_wifiP2pDeviceNamePrefix);
        mP2pDeviceNamePostfixNumDigits = mContext.getResources()
                .getInteger(R.integer.config_wifiP2pDeviceNamePostfixNumDigits);
        mClientModeImplNumLogRecs = mContext.getResources()
                .getInteger(R.integer.config_wifiClientModeImplNumLogRecs);
    }

    /** Get the interval between RSSI polls, in milliseconds. */
    public int getPollRssiIntervalMillis() {
        int interval = mPollRssiIntervalMillis.get();
        if (interval > 0) {
            return interval;
        } else {
            return Math.min(
                    mContext.getResources()
                            .getInteger(R.integer.config_wifiPollRssiIntervalMilliseconds),
                    MAXIMUM_POLL_RSSI_INTERVAL_MSECS);
        }
    }

    /** Set the interval between RSSI polls, in milliseconds. */
    public void setPollRssiIntervalMillis(int newPollIntervalMillis) {
        mPollRssiIntervalMillis.set(newPollIntervalMillis);
    }

    /** Returns whether CMD_IP_REACHABILITY_LOST events should trigger disconnects. */
    public boolean getIpReachabilityDisconnectEnabled() {
        return mIpReachabilityDisconnectEnabled.get();
    }

    /** Sets whether CMD_IP_REACHABILITY_LOST events should trigger disconnects. */
    public void setIpReachabilityDisconnectEnabled(boolean enabled) {
        mIpReachabilityDisconnectEnabled.set(enabled);
    }

    /** Set whether bluetooth is enabled. */
    public void setBluetoothEnabled(boolean isEnabled) {
        // If BT was connected and then turned off, there is no CONNECTION_STATE_CHANGE message.
        // So set mIsBluetoothConnected to false if we get a bluetooth disable while connected.
        // But otherwise, Bluetooth being turned on doesn't mean that we're connected.
        if (!isEnabled) {
            mIsBluetoothConnected.set(false);
        }
    }

    /** Set whether bluetooth is connected. */
    public void setBluetoothConnected(boolean isConnected) {
        mIsBluetoothConnected.set(isConnected);
    }

    /** Get whether bluetooth is connected */
    public boolean isBluetoothConnected() {
        return mIsBluetoothConnected.get();
    }

    /**
     * Helper method to check if Connected MAC Randomization is supported - onDown events are
     * skipped if this feature is enabled (b/72459123).
     *
     * @return boolean true if Connected MAC randomization is supported, false otherwise
     */
    public boolean isConnectedMacRandomizationEnabled() {
        return mContext.getResources().getBoolean(
                R.bool.config_wifi_connected_mac_randomization_supported);
    }

    /**
     * Help method to check if WPA3 SAE auto-upgrade is enabled.
     *
     * @return boolean true if auto-upgrade is enabled, false otherwise.
     */
    public boolean isWpa3SaeUpgradeEnabled() {
        return mIsWpa3SaeUpgradeEnabled;
    }

    /**
     * Help method to check if WPA3 SAE auto-upgrade offload is enabled.
     *
     * @return boolean true if auto-upgrade offload is enabled, false otherwise.
     */
    public boolean isWpa3SaeUpgradeOffloadEnabled() {
        return mIsWpa3SaeUpgradeOffloadEnabled;
    }

    /**
     * Help method to check if OWE auto-upgrade is enabled.
     *
     * @return boolean true if auto-upgrade is enabled, false otherwise.
     */
    public boolean isOweUpgradeEnabled() {
        return mIsOweUpgradeEnabled;
    }

    /**
     * Help method to check if the setting to flush ANQP cache when Wi-Fi is toggled off.
     *
     * @return boolean true to flush ANQP cache on Wi-Fi toggle off event, false otherwise.
     */
    public boolean flushAnqpCacheOnWifiToggleOffEvent() {
        return mFlushAnqpCacheOnWifiToggleOffEvent;
    }

    /*
     * Help method to check if WPA3 SAE Hash-to-Element is supported on this device.
     *
     * @return boolean true if supported;otherwise false.
     */
    public boolean isWpa3SaeH2eSupported() {
        return mIsWpa3SaeH2eSupported;
    }

    /** Set if show key verbose logging mode is enabled. */
    public void setShowKeyVerboseLoggingModeEnabled(boolean enable) {
        mIsShowKeyVerboseLoggingModeEnabled = enable;
    }

    /** Check if show key verbose logging mode is enabled. */
    public boolean getShowKeyVerboseLoggingModeEnabled() {
        return mIsShowKeyVerboseLoggingModeEnabled;
    }

    /** Get the prefix of the default wifi p2p device name. */
    public String getWifiP2pDeviceNamePrefix() {
        return mP2pDeviceNamePrefix;
    }

    /** Get the number of the default wifi p2p device name postfix digit. */
    public int getWifiP2pDeviceNamePostfixNumDigits() {
        return mP2pDeviceNamePostfixNumDigits;
    }

    /** Get the number of log records to maintain. */
    public int getClientModeImplNumLogRecs() {
        return mClientModeImplNumLogRecs;
    }

    /** Dump method for debugging */
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        pw.println("Dump of WifiGlobals");
        pw.println("mPollRssiIntervalMillis=" + mPollRssiIntervalMillis.get());
        pw.println("mIpReachabilityDisconnectEnabled=" + mIpReachabilityDisconnectEnabled.get());
        pw.println("mIsBluetoothConnected=" + mIsBluetoothConnected.get());
        pw.println("mIsWpa3SaeUpgradeEnabled=" + mIsWpa3SaeUpgradeEnabled);
        pw.println("mIsWpa3SaeUpgradeOffloadEnabled=" + mIsWpa3SaeUpgradeOffloadEnabled);
        pw.println("mIsOweUpgradeEnabled=" + mIsOweUpgradeEnabled);
        pw.println("mFlushAnqpCacheOnWifiToggleOffEvent=" + mFlushAnqpCacheOnWifiToggleOffEvent);
        pw.println("mIsWpa3SaeH2eSupported=" + mIsWpa3SaeH2eSupported);
        pw.println("mP2pDeviceNamePrefix=" + mP2pDeviceNamePrefix);
        pw.println("mP2pDeviceNamePostfixNumDigits=" + mP2pDeviceNamePostfixNumDigits);
        pw.println("mClientModeImplNumLogRecs=" + mClientModeImplNumLogRecs);
    }
}