/*
 * Copyright (C) 2015 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.
 */
#ifndef JANKTRACKER_H_
#define JANKTRACKER_H_

#include "FrameInfo.h"
#include "renderthread/TimeLord.h"
#include "utils/RingBuffer.h"

#include <cutils/compiler.h>

#include <array>
#include <memory>

namespace android {
namespace uirenderer {

enum JankType {
    kMissedVsync = 0,
    kHighInputLatency,
    kSlowUI,
    kSlowSync,
    kSlowRT,

    // must be last
    NUM_BUCKETS,
};

struct SlowFrame {
    uint16_t whenHours; // When this occurred in CLOCK_MONOTONIC in hours
    uint16_t frametimeMs; // How long the frame took in ms
};

// Try to keep as small as possible, should match ASHMEM_SIZE in
// GraphicsStatsService.java
struct ProfileData {
    std::array<uint32_t, NUM_BUCKETS> jankTypeCounts;
    // See comments on kBucket* constants for what this holds
    std::array<uint32_t, 55> frameCounts;

    uint32_t totalFrameCount;
    uint32_t jankFrameCount;
    nsecs_t statStartTime;

    std::array<SlowFrame, 10> slowestFrames;
};

// TODO: Replace DrawProfiler with this
class JankTracker {
public:
    JankTracker(nsecs_t frameIntervalNanos);
    ~JankTracker();

    void addFrame(const FrameInfo& frame);

    void dump(int fd) { dumpData(mData, fd); }
    void reset();

    void switchStorageToAshmem(int ashmemfd);

    uint32_t findPercentile(int p) { return findPercentile(mData, p); }

    ANDROID_API static void dumpBuffer(const void* buffer, size_t bufsize, int fd);

private:
    void freeData();
    void setFrameInterval(nsecs_t frameIntervalNanos);
    void updateSlowest(const FrameInfo& frame);

    static uint32_t findPercentile(const ProfileData* data, int p);
    static void dumpData(const ProfileData* data, int fd);

    std::array<int64_t, NUM_BUCKETS> mThresholds;
    int64_t mFrameInterval;
    ProfileData* mData;
    bool mIsMapped = false;
};

} /* namespace uirenderer */
} /* namespace android */

#endif /* JANKTRACKER_H_ */