/*
 * Copyright (C) 2023 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.
 */
#include "AdaptiveDvfsStateResidencyDataProvider.h"

#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>

#include <string>
#include <utility>

using android::base::Split;
using android::base::Trim;

static const std::string pathSuffix = "/time_in_state";
static const std::string stateSuffix = "MHz";

namespace aidl {
namespace android {
namespace hardware {
namespace power {
namespace stats {

AdaptiveDvfsStateResidencyDataProvider::AdaptiveDvfsStateResidencyDataProvider(
        std::string path,
        uint64_t clockRate,
        std::vector<std::pair<std::string, std::string>> powerEntities)
    : DvfsStateResidencyDataProvider(path, clockRate, {}) {
    size_t len = 0;
    char *line = nullptr;
    std::vector<std::pair<std::string, std::string>> states = {};
    std::vector<std::string> parts;

    for (int32_t i = 0; i < powerEntities.size(); i++) {
        std::string freqPath = powerEntities[i].second + pathSuffix;
        std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(freqPath.c_str(), "r"), fclose);
        if (!fp) {
            PLOG(ERROR) << __func__ << ":Failed to open file " << freqPath;
            continue;
        }

        while (getline(&line, &len, fp.get()) != -1) {
            parts = Split(Trim(std::string(line)), " ");
            if (parts.size() > 0) {
                std::string freqStr = Trim(parts[0]);
                states.push_back(std::make_pair(
                        freqStr.substr(0, freqStr.length() - 3) + stateSuffix,
                        freqStr));
            }
        }

        // Cpufreq data is sorted in ascending order, but power stats are sorted
        // in descending order. Reverse sorting to maintain consistency with
        // other power stats.
        if (states.size() > 1 &&
                std::atoll(states[0].second.c_str()) < std::atoll(states[1].second.c_str())) {
            std::reverse(states.begin(), states.end());
        }

        mPowerEntities.push_back({powerEntities[i].first, std::move(states)});
    }

    free(line);
}

bool AdaptiveDvfsStateResidencyDataProvider::getStateResidencies(
        std::unordered_map<std::string, std::vector<StateResidency>> *residencies) {
    return DvfsStateResidencyDataProvider::getStateResidencies(residencies);
}

std::unordered_map<std::string, std::vector<State>>
        AdaptiveDvfsStateResidencyDataProvider::getInfo() {
    return DvfsStateResidencyDataProvider::getInfo();
}

}  // namespace stats
}  // namespace power
}  // namespace hardware
}  // namespace android
}  // namespace aidl
