/*
 * Copyright (C) 2021 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.appsearch;

import android.annotation.NonNull;
import android.app.appsearch.util.LogUtil;
import android.util.Log;

import com.android.server.appsearch.external.localstorage.AppSearchImpl;
import com.android.server.appsearch.external.localstorage.OptimizeStrategy;

import com.google.android.icing.proto.GetOptimizeInfoResultProto;

import java.util.Objects;

/**
 * An implementation of {@link OptimizeStrategy} will determine when to trigger {@link
 * AppSearchImpl#optimize()} based on last time optimize ran and number of bytes to optimize. This
 * implementation is used by environments with AppSearch service running like Framework and GMSCore.
 *
 * @hide
 */
public class ServiceOptimizeStrategy implements OptimizeStrategy {
    private static final String TAG = "AppSearchOptimize";
    private final ServiceAppSearchConfig mAppSearchConfig;

    ServiceOptimizeStrategy(@NonNull ServiceAppSearchConfig config) {
        mAppSearchConfig = Objects.requireNonNull(config);
    }

    @Override
    public boolean shouldOptimize(@NonNull GetOptimizeInfoResultProto optimizeInfo) {
        boolean wantsOptimize =
                optimizeInfo.getOptimizableDocs()
                                >= mAppSearchConfig.getCachedDocCountOptimizeThreshold()
                        || optimizeInfo.getEstimatedOptimizableBytes()
                                >= mAppSearchConfig.getCachedBytesOptimizeThreshold()
                        || optimizeInfo.getTimeSinceLastOptimizeMs()
                                >= mAppSearchConfig.getCachedTimeOptimizeThresholdMs();
        if (wantsOptimize
                && optimizeInfo.getTimeSinceLastOptimizeMs()
                        < mAppSearchConfig.getCachedMinTimeOptimizeThresholdMs()) {
            // TODO(b/271890504): Produce a log message for statsd when we skip a potential
            //  compaction because the time since the last compaction has not reached
            //  the minimum threshold.
            if (LogUtil.INFO) {
                Log.i(
                        TAG,
                        "Skipping optimization because time since last optimize ["
                                + optimizeInfo.getTimeSinceLastOptimizeMs()
                                + " ms] is lesser than the threshold for minimum time between"
                                + " optimizations ["
                                + mAppSearchConfig.getCachedMinTimeOptimizeThresholdMs()
                                + " ms]");
            }
            return false;
        }
        return wantsOptimize;
    }
}