package org.thoughtcrime.securesms.webrtc.locks;

import android.os.PowerManager;

import org.session.libsignal.utilities.Log;
import org.session.libsignal.utilities.guava.Optional;

/**
 * Controls access to the proximity lock.
 * The proximity lock is not part of the public API.
 *
 * @author Stuart O. Anderson
 */
class ProximityLock {

    private static final String TAG = ProximityLock.class.getSimpleName();

    private final Optional<PowerManager.WakeLock> proximityLock;

    ProximityLock(PowerManager pm) {
        proximityLock = getProximityLock(pm);
    }

    private Optional<PowerManager.WakeLock> getProximityLock(PowerManager pm) {
        if (pm.isWakeLockLevelSupported(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK)) {
            return Optional.fromNullable(pm.newWakeLock(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, "signal:proximity"));
        } else {
            return Optional.absent();
        }
    }

    public void acquire() {
        if (!proximityLock.isPresent() || proximityLock.get().isHeld()) {
            return;
        }

        proximityLock.get().acquire();
    }

    public void release() {
        if (!proximityLock.isPresent() || !proximityLock.get().isHeld()) {
            return;
        }

        proximityLock.get().release(PowerManager.RELEASE_FLAG_WAIT_FOR_NO_PROXIMITY);

        Log.d(TAG, "Released proximity lock:" + proximityLock.get().isHeld());
    }

}