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/*
 * 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.people.data;

import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.WorkerThread;
import android.net.Uri;
import android.util.ArrayMap;

import com.android.internal.annotations.GuardedBy;

import java.io.File;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ScheduledExecutorService;
import java.util.function.Predicate;

/** The store that stores and accesses the events data for a package. */
class EventStore {

    /** The events that are queryable with a shortcut ID. */
    static final int CATEGORY_SHORTCUT_BASED = 0;

    /** The events that are queryable with a {@link android.content.LocusId}. */
    static final int CATEGORY_LOCUS_ID_BASED = 1;

    /** The phone call events that are queryable with a phone number. */
    static final int CATEGORY_CALL = 2;

    /** The SMS or MMS events that are queryable with a phone number. */
    static final int CATEGORY_SMS = 3;

    /** The events that are queryable with an {@link android.app.Activity} class name. */
    static final int CATEGORY_CLASS_BASED = 4;

    @IntDef(prefix = { "CATEGORY_" }, value = {
            CATEGORY_SHORTCUT_BASED,
            CATEGORY_LOCUS_ID_BASED,
            CATEGORY_CALL,
            CATEGORY_SMS,
            CATEGORY_CLASS_BASED,
    })
    @Retention(RetentionPolicy.SOURCE)
    @interface EventCategory {}

    @GuardedBy("this")
    private final List> mEventHistoryMaps = new ArrayList<>();
    private final List mEventsCategoryDirs = new ArrayList<>();
    private final ScheduledExecutorService mScheduledExecutorService;

    EventStore(@NonNull File packageDir,
            @NonNull ScheduledExecutorService scheduledExecutorService) {
        mEventHistoryMaps.add(CATEGORY_SHORTCUT_BASED, new ArrayMap<>());
        mEventHistoryMaps.add(CATEGORY_LOCUS_ID_BASED, new ArrayMap<>());
        mEventHistoryMaps.add(CATEGORY_CALL, new ArrayMap<>());
        mEventHistoryMaps.add(CATEGORY_SMS, new ArrayMap<>());
        mEventHistoryMaps.add(CATEGORY_CLASS_BASED, new ArrayMap<>());

        File eventDir = new File(packageDir, "event");
        mEventsCategoryDirs.add(CATEGORY_SHORTCUT_BASED, new File(eventDir, "shortcut"));
        mEventsCategoryDirs.add(CATEGORY_LOCUS_ID_BASED, new File(eventDir, "locus"));
        mEventsCategoryDirs.add(CATEGORY_CALL, new File(eventDir, "call"));
        mEventsCategoryDirs.add(CATEGORY_SMS, new File(eventDir, "sms"));
        mEventsCategoryDirs.add(CATEGORY_CLASS_BASED, new File(eventDir, "class"));

        mScheduledExecutorService = scheduledExecutorService;
    }

    /**
     * Loads existing {@link EventHistoryImpl}s from disk. This should be called when device powers
     * on and user is unlocked.
     */
    @WorkerThread
    synchronized void loadFromDisk() {
        for (@EventCategory int category = 0; category < mEventsCategoryDirs.size();
                category++) {
            File categoryDir = mEventsCategoryDirs.get(category);
            Map existingEventHistoriesImpl =
                    EventHistoryImpl.eventHistoriesImplFromDisk(categoryDir,
                            mScheduledExecutorService);
            mEventHistoryMaps.get(category).putAll(existingEventHistoriesImpl);
        }
    }

    /**
     * Flushes all {@link EventHistoryImpl}s to disk. Should be called when device is shutting down.
     */
    synchronized void saveToDisk() {
        for (Map map : mEventHistoryMaps) {
            for (EventHistoryImpl eventHistory : map.values()) {
                eventHistory.saveToDisk();
            }
        }
    }

    /**
     * Gets the {@link EventHistory} for the specified key if exists.
     *
     * @param key Category-specific key, it can be shortcut ID, locus ID, phone number, or class
     *            name.
     */
    @Nullable
    synchronized EventHistory getEventHistory(@EventCategory int category, String key) {
        return mEventHistoryMaps.get(category).get(key);
    }

    /**
     * Gets the {@link EventHistoryImpl} for the specified ID or creates a new instance and put it
     * into the store if not exists. The caller needs to verify if the associated conversation
     * exists before calling this method.
     *
     * @param key Category-specific key, it can be shortcut ID, locus ID, phone number, or class
     *            name.
     */
    @NonNull
    synchronized EventHistoryImpl getOrCreateEventHistory(@EventCategory int category, String key) {
        return mEventHistoryMaps.get(category).computeIfAbsent(key,
                k -> new EventHistoryImpl(
                        new File(mEventsCategoryDirs.get(category), Uri.encode(key)),
                        mScheduledExecutorService));
    }

    /**
     * Deletes the events and index data for the specified key.
     *
     * @param key Category-specific key, it can be shortcut ID, locus ID, phone number, or class
     *            name.
     */
    synchronized void deleteEventHistory(@EventCategory int category, String key) {
        EventHistoryImpl eventHistory = mEventHistoryMaps.get(category).remove(key);
        if (eventHistory != null) {
            eventHistory.onDestroy();
        }
    }

    /** Deletes all the events and index data for the specified category from disk. */
    synchronized void deleteEventHistories(@EventCategory int category) {
        for (EventHistoryImpl eventHistory : mEventHistoryMaps.get(category).values()) {
            eventHistory.onDestroy();
        }
        mEventHistoryMaps.get(category).clear();
    }

    /** Deletes the events data that exceeds the retention period. */
    synchronized void pruneOldEvents() {
        for (Map map : mEventHistoryMaps) {
            for (EventHistoryImpl eventHistory : map.values()) {
                eventHistory.pruneOldEvents();
            }
        }
    }

    /**
     * Prunes the event histories whose key (shortcut ID, locus ID or phone number) does not match
     * any conversations.
     *
     * @param keyChecker Check whether there exists a conversation contains this key.
     */
    synchronized void pruneOrphanEventHistories(@EventCategory int category,
            Predicate keyChecker) {
        Set keys = mEventHistoryMaps.get(category).keySet();
        List keysToDelete = new ArrayList<>();
        for (String key : keys) {
            if (!keyChecker.test(key)) {
                keysToDelete.add(key);
            }
        }
        Map eventHistoryMap = mEventHistoryMaps.get(category);
        for (String key : keysToDelete) {
            EventHistoryImpl eventHistory = eventHistoryMap.remove(key);
            if (eventHistory != null) {
                eventHistory.onDestroy();
            }
        }
    }

    synchronized void onDestroy() {
        for (Map map : mEventHistoryMaps) {
            for (EventHistoryImpl eventHistory : map.values()) {
                eventHistory.onDestroy();
            }
        }
    }
}