/*
 * Copyright (C) 2017 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.
 */

#pragma once

#include <gtest/gtest_prod.h>
#include "config/ConfigListener.h"
#include "logd/LogReader.h"
#include "metrics/MetricsManager.h"
#include "packages/UidMap.h"
#include "external/StatsPullerManager.h"

#include "frameworks/base/cmds/statsd/src/statsd_config.pb.h"

#include <stdio.h>
#include <unordered_map>

namespace android {
namespace os {
namespace statsd {

// Keep this in sync with DumpReportReason enum in stats_log.proto
enum DumpReportReason {
    DEVICE_SHUTDOWN = 1,
    CONFIG_UPDATED = 2,
    CONFIG_REMOVED = 3,
    GET_DATA_CALLED = 4,
    ADB_DUMP = 5,
    CONFIG_RESET = 6,
    STATSCOMPANION_DIED = 7
};

class StatsLogProcessor : public ConfigListener {
public:
    StatsLogProcessor(const sp<UidMap>& uidMap, const sp<AlarmMonitor>& anomalyAlarmMonitor,
                      const sp<AlarmMonitor>& subscriberTriggerAlarmMonitor,
                      const int64_t timeBaseNs,
                      const std::function<void(const ConfigKey&)>& sendBroadcast);
    virtual ~StatsLogProcessor();

    void OnLogEvent(LogEvent* event, bool reconnectionStarts);

    // for testing only.
    void OnLogEvent(LogEvent* event);

    void OnConfigUpdated(const int64_t timestampNs, const ConfigKey& key,
                         const StatsdConfig& config);
    void OnConfigRemoved(const ConfigKey& key);

    size_t GetMetricsSize(const ConfigKey& key) const;

    void onDumpReport(const ConfigKey& key, const int64_t dumpTimeNs,
                      const bool include_current_partial_bucket,
                      const DumpReportReason dumpReportReason, vector<uint8_t>* outData);

    /* Tells MetricsManager that the alarms in alarmSet have fired. Modifies anomaly alarmSet. */
    void onAnomalyAlarmFired(
            const int64_t& timestampNs,
            unordered_set<sp<const InternalAlarm>, SpHash<InternalAlarm>> alarmSet);

    /* Tells MetricsManager that the alarms in alarmSet have fired. Modifies periodic alarmSet. */
    void onPeriodicAlarmFired(
            const int64_t& timestampNs,
            unordered_set<sp<const InternalAlarm>, SpHash<InternalAlarm>> alarmSet);

    /* Flushes data to disk. Data on memory will be gone after written to disk. */
    void WriteDataToDisk(bool shutdown);

    inline sp<UidMap> getUidMap() {
        return mUidMap;
    }

    void dumpStates(FILE* out, bool verbose);

    void informPullAlarmFired(const int64_t timestampNs);

    int64_t getLastReportTimeNs(const ConfigKey& key);

private:
    // For testing only.
    inline sp<AlarmMonitor> getAnomalyAlarmMonitor() const {
        return mAnomalyAlarmMonitor;
    }

    inline sp<AlarmMonitor> getPeriodicAlarmMonitor() const {
        return mPeriodicAlarmMonitor;
    }

    mutable mutex mMetricsMutex;

    std::unordered_map<ConfigKey, sp<MetricsManager>> mMetricsManagers;

    std::unordered_map<ConfigKey, long> mLastBroadcastTimes;

    // Tracks when we last checked the bytes consumed for each config key.
    std::unordered_map<ConfigKey, long> mLastByteSizeTimes;

    sp<UidMap> mUidMap;  // Reference to the UidMap to lookup app name and version for each uid.

    StatsPullerManager mStatsPullerManager;

    sp<AlarmMonitor> mAnomalyAlarmMonitor;

    sp<AlarmMonitor> mPeriodicAlarmMonitor;

    void resetIfConfigTtlExpiredLocked(const int64_t timestampNs);

    void OnConfigUpdatedLocked(
        const int64_t currentTimestampNs, const ConfigKey& key, const StatsdConfig& config);

    void WriteDataToDiskLocked(DumpReportReason dumpReportReason);
    void WriteDataToDiskLocked(const ConfigKey& key, DumpReportReason dumpReportReason);

    void onConfigMetricsReportLocked(const ConfigKey& key, const int64_t dumpTimeStampNs,
                                     const bool include_current_partial_bucket,
                                     const DumpReportReason dumpReportReason,
                                     util::ProtoOutputStream* proto);

    /* Check if we should send a broadcast if approaching memory limits and if we're over, we
     * actually delete the data. */
    void flushIfNecessaryLocked(int64_t timestampNs, const ConfigKey& key,
                                MetricsManager& metricsManager);

    // Maps the isolated uid in the log event to host uid if the log event contains uid fields.
    void mapIsolatedUidToHostUidIfNecessaryLocked(LogEvent* event) const;

    // Handler over the isolated uid change event.
    void onIsolatedUidChangedEventLocked(const LogEvent& event);

    void resetConfigsLocked(const int64_t timestampNs, const std::vector<ConfigKey>& configs);

    // Function used to send a broadcast so that receiver for the config key can call getData
    // to retrieve the stored data.
    std::function<void(const ConfigKey& key)> mSendBroadcast;

    const int64_t mTimeBaseNs;

    // Largest timestamp of the events that we have processed.
    int64_t mLargestTimestampSeen = 0;

    int64_t mLastTimestampSeen = 0;

    bool mInReconnection = false;

    // Processed log count
    uint64_t mLogCount = 0;

    // Log loss detected count
    int mLogLossCount = 0;

    long mLastPullerCacheClearTimeSec = 0;

    FRIEND_TEST(StatsLogProcessorTest, TestOutOfOrderLogs);
    FRIEND_TEST(StatsLogProcessorTest, TestRateLimitByteSize);
    FRIEND_TEST(StatsLogProcessorTest, TestRateLimitBroadcast);
    FRIEND_TEST(StatsLogProcessorTest, TestDropWhenByteSizeTooLarge);
    FRIEND_TEST(WakelockDurationE2eTest, TestAggregatedPredicateDimensionsForSumDuration1);
    FRIEND_TEST(WakelockDurationE2eTest, TestAggregatedPredicateDimensionsForSumDuration2);
    FRIEND_TEST(WakelockDurationE2eTest, TestAggregatedPredicateDimensionsForSumDuration3);
    FRIEND_TEST(WakelockDurationE2eTest, TestAggregatedPredicateDimensionsForMaxDuration1);
    FRIEND_TEST(WakelockDurationE2eTest, TestAggregatedPredicateDimensionsForMaxDuration2);
    FRIEND_TEST(WakelockDurationE2eTest, TestAggregatedPredicateDimensionsForMaxDuration3);
    FRIEND_TEST(MetricConditionLinkE2eTest, TestMultiplePredicatesAndLinks1);
    FRIEND_TEST(MetricConditionLinkE2eTest, TestMultiplePredicatesAndLinks2);
    FRIEND_TEST(AttributionE2eTest, TestAttributionMatchAndSliceByFirstUid);
    FRIEND_TEST(AttributionE2eTest, TestAttributionMatchAndSliceByChain);
    FRIEND_TEST(GaugeMetricE2eTest, TestMultipleFieldsForPushedEvent);
    FRIEND_TEST(GaugeMetricE2eTest, TestRandomSamplePulledEvents);
    FRIEND_TEST(GaugeMetricE2eTest, TestRandomSamplePulledEvent_LateAlarm);
    FRIEND_TEST(GaugeMetricE2eTest, TestAllConditionChangesSamplePulledEvents);
    FRIEND_TEST(ValueMetricE2eTest, TestPulledEvents);
    FRIEND_TEST(ValueMetricE2eTest, TestPulledEvents_LateAlarm);

    FRIEND_TEST(DimensionInConditionE2eTest, TestCreateCountMetric_NoLink_OR_CombinationCondition);
    FRIEND_TEST(DimensionInConditionE2eTest, TestCreateCountMetric_Link_OR_CombinationCondition);
    FRIEND_TEST(DimensionInConditionE2eTest, TestDurationMetric_NoLink_OR_CombinationCondition);
    FRIEND_TEST(DimensionInConditionE2eTest, TestDurationMetric_Link_OR_CombinationCondition);

    FRIEND_TEST(DimensionInConditionE2eTest, TestDurationMetric_NoLink_SimpleCondition);
    FRIEND_TEST(DimensionInConditionE2eTest, TestDurationMetric_Link_SimpleCondition);
    FRIEND_TEST(DimensionInConditionE2eTest, TestDurationMetric_PartialLink_SimpleCondition);

    FRIEND_TEST(DimensionInConditionE2eTest, TestDurationMetric_PartialLink_AND_CombinationCondition);
    FRIEND_TEST(DimensionInConditionE2eTest, TestDurationMetric_NoLink_AND_CombinationCondition);
    FRIEND_TEST(DimensionInConditionE2eTest, TestDurationMetric_Link_AND_CombinationCondition);

    FRIEND_TEST(AnomalyDetectionE2eTest, TestSlicedCountMetric_single_bucket);
    FRIEND_TEST(AnomalyDetectionE2eTest, TestSlicedCountMetric_multiple_buckets);
    FRIEND_TEST(AnomalyDetectionE2eTest, TestDurationMetric_SUM_single_bucket);
    FRIEND_TEST(AnomalyDetectionE2eTest, TestDurationMetric_SUM_multiple_buckets);
    FRIEND_TEST(AnomalyDetectionE2eTest, TestDurationMetric_SUM_long_refractory_period);

    FRIEND_TEST(AlarmE2eTest, TestMultipleAlarms);
    FRIEND_TEST(ConfigTtlE2eTest, TestCountMetric);
};

}  // namespace statsd
}  // namespace os
}  // namespace android