/*
 * Copyright (C) 2018 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.
 */

//#define LOG_NDEBUG 0
#define LOG_TAG "ACameraManagerVendor"

#include <memory>
#include "ndk_vendor/impl/ACameraManager.h"
#include "ACameraMetadata.h"
#include "ndk_vendor/impl/ACameraDevice.h"
#include "utils.h"
#include <CameraMetadata.h>
#include <camera_metadata_hidden.h>

#include <utils/Vector.h>
#include <cutils/properties.h>
#include <stdlib.h>

#include <VendorTagDescriptor.h>

using namespace android::acam;

namespace android {
namespace acam {

using frameworks::cameraservice::common::V2_0::ProviderIdAndVendorTagSections;
using android::hardware::camera::common::V1_0::helper::VendorTagDescriptor;
using android::hardware::camera::common::V1_0::helper::VendorTagDescriptorCache;

// Static member definitions
const char* CameraManagerGlobal::kCameraIdKey   = "CameraId";
const char* CameraManagerGlobal::kPhysicalCameraIdKey   = "PhysicalCameraId";
const char* CameraManagerGlobal::kCallbackFpKey = "CallbackFp";
const char* CameraManagerGlobal::kContextKey    = "CallbackContext";
const nsecs_t CameraManagerGlobal::kCallbackDrainTimeout = 5000000; // 5 ms
Mutex                CameraManagerGlobal::sLock;
CameraManagerGlobal* CameraManagerGlobal::sInstance = nullptr;

/**
 * The vendor tag descriptor class that takes HIDL vendor tag information as
 * input. Not part of vendor available VendorTagDescriptor class because that class is used by
 * default HAL implementation code as well.
 */
class HidlVendorTagDescriptor : public VendorTagDescriptor {
public:
    /**
     * Create a VendorTagDescriptor object from the HIDL VendorTagSection
     * vector.
     *
     * Returns OK on success, or a negative error code.
     */
    static status_t createDescriptorFromHidl(const hidl_vec<VendorTagSection>& vts,
                                             /*out*/ sp<VendorTagDescriptor> *descriptor);
};

status_t HidlVendorTagDescriptor::createDescriptorFromHidl(const hidl_vec<VendorTagSection> &vts,
                                                           sp<VendorTagDescriptor> *descriptor) {
    int tagCount = 0;

    for (size_t s = 0; s < vts.size(); s++) {
        tagCount += vts[s].tags.size();
    }

    if (tagCount < 0 || tagCount > INT32_MAX) {
        ALOGE("%s: tag count %d from vendor tag sections is invalid.", __FUNCTION__, tagCount);
        return BAD_VALUE;
    }

    Vector<uint32_t> tagArray;
    LOG_ALWAYS_FATAL_IF(tagArray.resize(tagCount) != tagCount,
            "%s: too many (%u) vendor tags defined.", __FUNCTION__, tagCount);

    sp<HidlVendorTagDescriptor> desc = new HidlVendorTagDescriptor();
    desc->mTagCount = tagCount;

    KeyedVector<uint32_t, String8> tagToSectionMap;

    int idx = 0;
    for (size_t s = 0; s < vts.size(); s++) {
        const VendorTagSection& section = vts[s];
        const char *sectionName = section.sectionName.c_str();
        if (sectionName == NULL) {
            ALOGE("%s: no section name defined for vendor tag section %zu.", __FUNCTION__, s);
            return BAD_VALUE;
        }
        String8 sectionString(sectionName);
        desc->mSections.add(sectionString);

        for (size_t j = 0; j < section.tags.size(); j++) {
            uint32_t tag = section.tags[j].tagId;
            if (tag < CAMERA_METADATA_VENDOR_TAG_BOUNDARY) {
                ALOGE("%s: vendor tag %d not in vendor tag section.", __FUNCTION__, tag);
                return BAD_VALUE;
            }

            tagArray.editItemAt(idx++) = section.tags[j].tagId;

            const char *tagName = section.tags[j].tagName.c_str();
            if (tagName == NULL) {
                ALOGE("%s: no tag name defined for vendor tag %d.", __FUNCTION__, tag);
                return BAD_VALUE;
            }
            desc->mTagToNameMap.add(tag, String8(tagName));
            tagToSectionMap.add(tag, sectionString);

            int tagType = (int) section.tags[j].tagType;
            if (tagType < 0 || tagType >= NUM_TYPES) {
                ALOGE("%s: tag type %d from vendor ops does not exist.", __FUNCTION__, tagType);
                return BAD_VALUE;
            }
            desc->mTagToTypeMap.emplace(tag, tagType);
        }
    }

    for (size_t i = 0; i < tagArray.size(); ++i) {
        uint32_t tag = tagArray[i];
        String8 sectionString = tagToSectionMap.valueFor(tag);

        // Set up tag to section index map
        ssize_t index = desc->mSections.indexOf(sectionString);
        LOG_ALWAYS_FATAL_IF(index < 0, "index %zd must be non-negative", index);
        desc->mTagToSectionMap.add(tag, static_cast<uint32_t>(index));

        // Set up reverse mapping
        ssize_t reverseIndex = -1;
        if ((reverseIndex = desc->mReverseMapping.indexOfKey(sectionString)) < 0) {
            KeyedVector<String8, uint32_t>* nameMapper = new KeyedVector<String8, uint32_t>();
            reverseIndex = desc->mReverseMapping.add(sectionString, nameMapper);
        }
        desc->mReverseMapping[reverseIndex]->add(desc->mTagToNameMap.valueFor(tag), tag);
    }

    *descriptor = std::move(desc);
    return OK;
}

CameraManagerGlobal&
CameraManagerGlobal::getInstance() {
    Mutex::Autolock _l(sLock);
    CameraManagerGlobal* instance = sInstance;
    if (instance == nullptr) {
        instance = new CameraManagerGlobal();
        sInstance = instance;
    }
    return *instance;
}

CameraManagerGlobal::~CameraManagerGlobal() {
    // clear sInstance so next getInstance call knows to create a new one
    Mutex::Autolock _sl(sLock);
    sInstance = nullptr;
    Mutex::Autolock _l(mLock);
    if (mCameraService != nullptr) {
        mCameraService->unlinkToDeath(mDeathNotifier);
        mCameraService->removeListener(mCameraServiceListener);
    }
    mDeathNotifier.clear();
    if (mCbLooper != nullptr) {
        mCbLooper->unregisterHandler(mHandler->id());
        mCbLooper->stop();
    }
    mCbLooper.clear();
    mHandler.clear();
    mCameraServiceListener.clear();
    mCameraService.clear();
}

static bool isCameraServiceDisabled() {
    char value[PROPERTY_VALUE_MAX];
    property_get("config.disable_cameraservice", value, "0");
    return (strncmp(value, "0", 2) != 0 && strncasecmp(value, "false", 6) != 0);
}

bool CameraManagerGlobal::setupVendorTags() {
    sp<VendorTagDescriptorCache> tagCache = new VendorTagDescriptorCache();
    Status status = Status::NO_ERROR;
    std::vector<ProviderIdAndVendorTagSections> providerIdsAndVts;
    auto remoteRet = mCameraService->getCameraVendorTagSections([&status, &providerIdsAndVts]
                                                                 (Status s,
                                                                  auto &IdsAndVts) {
                                                         status = s;
                                                         providerIdsAndVts = IdsAndVts; });

    if (!remoteRet.isOk() || status != Status::NO_ERROR) {
        ALOGE("Failed to retrieve VendorTagSections %s", remoteRet.description().c_str());
        return false;
    }
    // Convert each providers VendorTagSections into a VendorTagDescriptor and
    // add it to the cache
    for (auto &providerIdAndVts : providerIdsAndVts) {
        sp<VendorTagDescriptor> vendorTagDescriptor;
        if (HidlVendorTagDescriptor::createDescriptorFromHidl(providerIdAndVts.vendorTagSections,
                                                              &vendorTagDescriptor) != OK) {
            ALOGE("Failed to convert from Hidl: VendorTagDescriptor");
            return false;
        }
        tagCache->addVendorDescriptor(providerIdAndVts.providerId, vendorTagDescriptor);
    }
    VendorTagDescriptorCache::setAsGlobalVendorTagCache(tagCache);
    return true;
}

sp<ICameraService> CameraManagerGlobal::getCameraService() {
    Mutex::Autolock _l(mLock);
    if (mCameraService.get() == nullptr) {
        if (isCameraServiceDisabled()) {
            return mCameraService;
        }

        sp<ICameraService> cameraServiceBinder;
        do {
            cameraServiceBinder = ICameraService::getService();
            if (cameraServiceBinder != nullptr) {
                break;
            }
            ALOGW("CameraService not published, waiting...");
            usleep(kCameraServicePollDelay);
        } while(true);
        if (mDeathNotifier == nullptr) {
            mDeathNotifier = new DeathNotifier(this);
        }
        cameraServiceBinder->linkToDeath(mDeathNotifier, 0);
        mCameraService = cameraServiceBinder;

        // Setup looper thread to perfrom availiability callbacks
        if (mCbLooper == nullptr) {
            mCbLooper = new ALooper;
            mCbLooper->setName("C2N-mgr-looper");
            status_t err = mCbLooper->start(
                    /*runOnCallingThread*/false,
                    /*canCallJava*/       true,
                    PRIORITY_DEFAULT);
            if (err != OK) {
                ALOGE("%s: Unable to start camera service listener looper: %s (%d)",
                        __FUNCTION__, strerror(-err), err);
                mCbLooper.clear();
                return nullptr;
            }
            if (mHandler == nullptr) {
                mHandler = new CallbackHandler(this);
            }
            mCbLooper->registerHandler(mHandler);
        }

        // register ICameraServiceListener
        if (mCameraServiceListener == nullptr) {
            mCameraServiceListener = new CameraServiceListener(this);
        }
        hidl_vec<frameworks::cameraservice::service::V2_1::CameraStatusAndId> cameraStatuses{};
        Status status = Status::NO_ERROR;
        auto remoteRet = mCameraService->addListener_2_1(mCameraServiceListener,
                                                     [&status, &cameraStatuses](Status s,
                                                                                auto &retStatuses) {
                                                         status = s;
                                                         cameraStatuses = retStatuses;
                                                     });
        if (!remoteRet.isOk() || status != Status::NO_ERROR) {
            ALOGE("Failed to add listener to camera service %s", remoteRet.description().c_str());
        }

        // Setup vendor tags
        if (!setupVendorTags()) {
            ALOGE("Unable to set up vendor tags");
            return nullptr;
        }

        for (auto& c : cameraStatuses) {
            onStatusChangedLocked(c.v2_0);

            for (auto& unavailablePhysicalId : c.unavailPhysicalCameraIds) {
                PhysicalCameraStatusAndId statusAndId;
                statusAndId.deviceStatus = CameraDeviceStatus::STATUS_NOT_PRESENT;
                statusAndId.cameraId = c.v2_0.cameraId;
                statusAndId.physicalCameraId = unavailablePhysicalId;
                onStatusChangedLocked(statusAndId);
            }
        }
    }
    return mCameraService;
}

void CameraManagerGlobal::DeathNotifier::serviceDied(uint64_t cookie, const wp<IBase> &who) {
    (void) cookie;
    (void) who;
    ALOGE("Camera service binderDied!");
    sp<CameraManagerGlobal> cm = mCameraManager.promote();
    if (cm != nullptr) {
        AutoMutex lock(cm->mLock);
        for (auto& pair : cm->mDeviceStatusMap) {
            CameraStatusAndId cameraStatusAndId;
            cameraStatusAndId.cameraId = pair.first;
            cameraStatusAndId.deviceStatus = pair.second.getStatus();
            cm->onStatusChangedLocked(cameraStatusAndId);
        }
        cm->mCameraService.clear();
        // TODO: consider adding re-connect call here?
    }
}

void CameraManagerGlobal::registerAvailabilityCallback(
        const ACameraManager_AvailabilityCallbacks *callback) {
    return registerAvailCallback<ACameraManager_AvailabilityCallbacks>(callback);
}

void CameraManagerGlobal::unregisterAvailabilityCallback(
        const ACameraManager_AvailabilityCallbacks *callback) {
    Mutex::Autolock _l(mLock);
    drainPendingCallbacksLocked();
    Callback cb(callback);
    mCallbacks.erase(cb);
}

void CameraManagerGlobal::registerExtendedAvailabilityCallback(
        const ACameraManager_ExtendedAvailabilityCallbacks *callback) {
    return registerAvailCallback<ACameraManager_ExtendedAvailabilityCallbacks>(callback);
}

void CameraManagerGlobal::unregisterExtendedAvailabilityCallback(
        const ACameraManager_ExtendedAvailabilityCallbacks *callback) {
    Mutex::Autolock _l(mLock);
    drainPendingCallbacksLocked();
    Callback cb(callback);
    mCallbacks.erase(cb);
}

void CameraManagerGlobal::onCallbackCalled() {
    Mutex::Autolock _l(mLock);
    if (mPendingCallbackCnt > 0) {
        mPendingCallbackCnt--;
    }
    mCallbacksCond.signal();
}

void CameraManagerGlobal::drainPendingCallbacksLocked() {
    while (mPendingCallbackCnt > 0) {
        auto res = mCallbacksCond.waitRelative(mLock, kCallbackDrainTimeout);
        if (res != NO_ERROR) {
            ALOGE("%s: Error waiting to drain callbacks: %s(%d)",
                    __FUNCTION__, strerror(-res), res);
            break;
        }
    }
}

template <class T>
void CameraManagerGlobal::registerAvailCallback(const T *callback) {
    Mutex::Autolock _l(mLock);
    Callback cb(callback);
    auto pair = mCallbacks.insert(cb);
    // Send initial callbacks if callback is newly registered
    if (pair.second) {
        for (auto& pair : mDeviceStatusMap) {
            const hidl_string& cameraId = pair.first;
            CameraDeviceStatus status = pair.second.getStatus();

            // Camera available/unavailable callback
            sp<AMessage> msg = new AMessage(kWhatSendSingleCallback, mHandler);
            ACameraManager_AvailabilityCallback cbFunc = isStatusAvailable(status) ?
                    cb.mAvailable : cb.mUnavailable;
            msg->setPointer(kCallbackFpKey, (void *) cbFunc);
            msg->setPointer(kContextKey, cb.mContext);
            msg->setString(kCameraIdKey, AString(cameraId.c_str()));
            mPendingCallbackCnt++;
            msg->post();

            // Physical camera unavailable callback
            std::set<hidl_string> unavailPhysicalIds = pair.second.getUnavailablePhysicalIds();
            for (const auto& physicalCameraId : unavailPhysicalIds) {
                sp<AMessage> msg = new AMessage(kWhatSendSinglePhysicalCameraCallback, mHandler);
                ACameraManager_PhysicalCameraAvailabilityCallback cbFunc =
                        cb.mPhysicalCamUnavailable;
                msg->setPointer(kCallbackFpKey, (void *) cbFunc);
                msg->setPointer(kContextKey, cb.mContext);
                msg->setString(kCameraIdKey, AString(cameraId.c_str()));
                msg->setString(kPhysicalCameraIdKey, AString(physicalCameraId.c_str()));
                mPendingCallbackCnt++;
                msg->post();
            }
        }
    }
}

void CameraManagerGlobal::getCameraIdList(std::vector<hidl_string>* cameraIds) {
    // Ensure that we have initialized/refreshed the list of available devices
    auto cs = getCameraService();
    Mutex::Autolock _l(mLock);

    for(auto& deviceStatus : mDeviceStatusMap) {
        CameraDeviceStatus status = deviceStatus.second.getStatus();
        if (status == CameraDeviceStatus::STATUS_NOT_PRESENT ||
                status == CameraDeviceStatus::STATUS_ENUMERATING) {
            continue;
        }
        cameraIds->push_back(deviceStatus.first);
    }
}

bool CameraManagerGlobal::validStatus(CameraDeviceStatus status) {
    switch (status) {
        case CameraDeviceStatus::STATUS_NOT_PRESENT:
        case CameraDeviceStatus::STATUS_PRESENT:
        case CameraDeviceStatus::STATUS_ENUMERATING:
        case CameraDeviceStatus::STATUS_NOT_AVAILABLE:
            return true;
        default:
            return false;
    }
}

bool CameraManagerGlobal::isStatusAvailable(CameraDeviceStatus status) {
    switch (status) {
        case CameraDeviceStatus::STATUS_PRESENT:
            return true;
        default:
            return false;
    }
}

void CameraManagerGlobal::CallbackHandler::onMessageReceived(
      const sp<AMessage> &msg) {
    onMessageReceivedInternal(msg);
    if (msg->what() == kWhatSendSingleCallback ||
            msg->what() == kWhatSendSinglePhysicalCameraCallback) {
        notifyParent();
    }
}

void CameraManagerGlobal::CallbackHandler::onMessageReceivedInternal(
        const sp<AMessage> &msg) {
    switch (msg->what()) {
        case kWhatSendSingleCallback:
        {
            ACameraManager_AvailabilityCallback cb;
            void* context;
            AString cameraId;
            bool found = msg->findPointer(kCallbackFpKey, (void**) &cb);
            if (!found) {
                ALOGE("%s: Cannot find camera callback fp!", __FUNCTION__);
                return;
            }
            found = msg->findPointer(kContextKey, &context);
            if (!found) {
                ALOGE("%s: Cannot find callback context!", __FUNCTION__);
                return;
            }
            found = msg->findString(kCameraIdKey, &cameraId);
            if (!found) {
                ALOGE("%s: Cannot find camera ID!", __FUNCTION__);
                return;
            }
            (*cb)(context, cameraId.c_str());
            break;
        }
        case kWhatSendSinglePhysicalCameraCallback:
        {
            ACameraManager_PhysicalCameraAvailabilityCallback cb;
            void* context;
            AString cameraId;
            AString physicalCameraId;
            bool found = msg->findPointer(kCallbackFpKey, (void**) &cb);
            if (!found) {
                ALOGE("%s: Cannot find camera callback fp!", __FUNCTION__);
                return;
            }
            found = msg->findPointer(kContextKey, &context);
            if (!found) {
                ALOGE("%s: Cannot find callback context!", __FUNCTION__);
                return;
            }
            found = msg->findString(kCameraIdKey, &cameraId);
            if (!found) {
                ALOGE("%s: Cannot find camera ID!", __FUNCTION__);
                return;
            }
            found = msg->findString(kPhysicalCameraIdKey, &physicalCameraId);
            if (!found) {
                ALOGE("%s: Cannot find physical camera ID!", __FUNCTION__);
                return;
            }
            (*cb)(context, cameraId.c_str(), physicalCameraId.c_str());
            break;
        }
        default:
            ALOGE("%s: unknown message type %d", __FUNCTION__, msg->what());
            break;
    }
}

void CameraManagerGlobal::CallbackHandler::notifyParent() {
    sp<CameraManagerGlobal> parent = mParent.promote();
    if (parent != nullptr) {
        parent->onCallbackCalled();
    }
}

hardware::Return<void> CameraManagerGlobal::CameraServiceListener::onStatusChanged(
        const CameraStatusAndId &statusAndId) {
    sp<CameraManagerGlobal> cm = mCameraManager.promote();
    if (cm != nullptr) {
        cm->onStatusChanged(statusAndId);
    } else {
        ALOGE("Cannot deliver status change. Global camera manager died");
    }
    return Void();
}

void CameraManagerGlobal::onStatusChanged(
        const CameraStatusAndId &statusAndId) {
    Mutex::Autolock _l(mLock);
    onStatusChangedLocked(statusAndId);
}

void CameraManagerGlobal::onStatusChangedLocked(
        const CameraStatusAndId &statusAndId) {
    hidl_string cameraId = statusAndId.cameraId;
    CameraDeviceStatus status = statusAndId.deviceStatus;
    if (!validStatus(status)) {
        ALOGE("%s: Invalid status %d", __FUNCTION__, status);
        return;
    }

    bool firstStatus = (mDeviceStatusMap.count(cameraId) == 0);
    CameraDeviceStatus oldStatus = firstStatus ?
            status : // first status
            mDeviceStatusMap[cameraId].getStatus();

    if (!firstStatus &&
            isStatusAvailable(status) == isStatusAvailable(oldStatus)) {
        // No status update. No need to send callback
        return;
    }

    // Iterate through all registered callbacks
    mDeviceStatusMap[cameraId].updateStatus(status);
    for (auto cb : mCallbacks) {
        sp<AMessage> msg = new AMessage(kWhatSendSingleCallback, mHandler);
        ACameraManager_AvailabilityCallback cbFp = isStatusAvailable(status) ?
                cb.mAvailable : cb.mUnavailable;
        msg->setPointer(kCallbackFpKey, (void *) cbFp);
        msg->setPointer(kContextKey, cb.mContext);
        msg->setString(kCameraIdKey, AString(cameraId.c_str()));
        mPendingCallbackCnt++;
        msg->post();
    }
    if (status == CameraDeviceStatus::STATUS_NOT_PRESENT) {
        mDeviceStatusMap.erase(cameraId);
    }
}

hardware::Return<void> CameraManagerGlobal::CameraServiceListener::onPhysicalCameraStatusChanged(
        const PhysicalCameraStatusAndId &statusAndId) {
    sp<CameraManagerGlobal> cm = mCameraManager.promote();
    if (cm != nullptr) {
        cm->onStatusChanged(statusAndId);
    } else {
        ALOGE("Cannot deliver status change. Global camera manager died");
    }
    return Void();
}

void CameraManagerGlobal::onStatusChanged(
        const PhysicalCameraStatusAndId &statusAndId) {
    Mutex::Autolock _l(mLock);
    onStatusChangedLocked(statusAndId);
}

void CameraManagerGlobal::onStatusChangedLocked(
        const PhysicalCameraStatusAndId &statusAndId) {
    hidl_string cameraId = statusAndId.cameraId;
    hidl_string physicalCameraId = statusAndId.physicalCameraId;
    CameraDeviceStatus status = statusAndId.deviceStatus;
    if (!validStatus(status)) {
        ALOGE("%s: Invalid status %d", __FUNCTION__, status);
        return;
    }

    auto logicalStatus = mDeviceStatusMap.find(cameraId);
    if (logicalStatus == mDeviceStatusMap.end()) {
        ALOGE("%s: Physical camera id %s status change on a non-present id %s",
                __FUNCTION__, physicalCameraId.c_str(), cameraId.c_str());
        return;
    }
    CameraDeviceStatus logicalCamStatus = mDeviceStatusMap[cameraId].getStatus();
    if (logicalCamStatus != CameraDeviceStatus::STATUS_PRESENT &&
            logicalCamStatus != CameraDeviceStatus::STATUS_NOT_AVAILABLE) {
        ALOGE("%s: Physical camera id %s status %d change for an invalid logical camera state %d",
                __FUNCTION__, physicalCameraId.c_str(), status, logicalCamStatus);
        return;
    }

    bool updated = false;
    if (status == CameraDeviceStatus::STATUS_PRESENT) {
        updated = mDeviceStatusMap[cameraId].removeUnavailablePhysicalId(physicalCameraId);
    } else {
        updated = mDeviceStatusMap[cameraId].addUnavailablePhysicalId(physicalCameraId);
    }

    // Iterate through all registered callbacks
    if (updated) {
        for (auto cb : mCallbacks) {
            sp<AMessage> msg = new AMessage(kWhatSendSinglePhysicalCameraCallback, mHandler);
            ACameraManager_PhysicalCameraAvailabilityCallback cbFp = isStatusAvailable(status) ?
                    cb.mPhysicalCamAvailable : cb.mPhysicalCamUnavailable;
            msg->setPointer(kCallbackFpKey, (void *) cbFp);
            msg->setPointer(kContextKey, cb.mContext);
            msg->setString(kCameraIdKey, AString(cameraId.c_str()));
            msg->setString(kPhysicalCameraIdKey, AString(physicalCameraId.c_str()));
            mPendingCallbackCnt++;
            msg->post();
        }
    }
}

CameraDeviceStatus CameraManagerGlobal::CameraStatus::getStatus() {
    std::lock_guard<std::mutex> lock(mLock);
    return status;
}

void CameraManagerGlobal::CameraStatus::updateStatus(CameraDeviceStatus newStatus) {
    std::lock_guard<std::mutex> lock(mLock);
    status = newStatus;
}

bool CameraManagerGlobal::CameraStatus::addUnavailablePhysicalId(
        const hidl_string& physicalCameraId) {
    std::lock_guard<std::mutex> lock(mLock);
    auto result = unavailablePhysicalIds.insert(physicalCameraId);
    return result.second;
}

bool CameraManagerGlobal::CameraStatus::removeUnavailablePhysicalId(
        const hidl_string& physicalCameraId) {
    std::lock_guard<std::mutex> lock(mLock);
    auto count = unavailablePhysicalIds.erase(physicalCameraId);
    return count > 0;
}

std::set<hidl_string> CameraManagerGlobal::CameraStatus::getUnavailablePhysicalIds() {
    std::lock_guard<std::mutex> lock(mLock);
    return unavailablePhysicalIds;
}

} // namespace acam
} // namespace android

/**
 * ACameraManger Implementation
 */
camera_status_t
ACameraManager::getCameraIdList(ACameraIdList** cameraIdList) {
    Mutex::Autolock _l(mLock);

    std::vector<hidl_string> idList;
    CameraManagerGlobal::getInstance().getCameraIdList(&idList);

    int numCameras = idList.size();
    ACameraIdList *out = new ACameraIdList;
    if (!out) {
        ALOGE("Allocate memory for ACameraIdList failed!");
        return ACAMERA_ERROR_NOT_ENOUGH_MEMORY;
    }
    out->numCameras = numCameras;
    out->cameraIds = new const char*[numCameras];
    if (!out->cameraIds) {
        ALOGE("Allocate memory for ACameraIdList failed!");
        deleteCameraIdList(out);
        return ACAMERA_ERROR_NOT_ENOUGH_MEMORY;
    }
    for (int i = 0; i < numCameras; i++) {
        const char* src = idList[i].c_str();
        size_t dstSize = strlen(src) + 1;
        char* dst = new char[dstSize];
        if (!dst) {
            ALOGE("Allocate memory for ACameraIdList failed!");
            deleteCameraIdList(out);
            return ACAMERA_ERROR_NOT_ENOUGH_MEMORY;
        }
        strlcpy(dst, src, dstSize);
        out->cameraIds[i] = dst;
    }
    *cameraIdList = out;
    return ACAMERA_OK;
}

void
ACameraManager::deleteCameraIdList(ACameraIdList* cameraIdList) {
    if (cameraIdList != nullptr) {
        if (cameraIdList->cameraIds != nullptr) {
            for (int i = 0; i < cameraIdList->numCameras; i ++) {
                if (cameraIdList->cameraIds[i] != nullptr) {
                    delete[] cameraIdList->cameraIds[i];
                }
            }
            delete[] cameraIdList->cameraIds;
        }
        delete cameraIdList;
    }
}

camera_status_t ACameraManager::getCameraCharacteristics(
        const char *cameraIdStr, sp<ACameraMetadata> *characteristics) {
    Mutex::Autolock _l(mLock);

    sp<ICameraService> cs = CameraManagerGlobal::getInstance().getCameraService();
    if (cs == nullptr) {
        ALOGE("%s: Cannot reach camera service!", __FUNCTION__);
        return ACAMERA_ERROR_CAMERA_DISCONNECTED;
    }
    CameraMetadata rawMetadata;
    Status status = Status::NO_ERROR;
    auto serviceRet =
        cs->getCameraCharacteristics(cameraIdStr,
                                     [&status, &rawMetadata] (auto s ,
                                                              const hidl_vec<uint8_t> &metadata) {
                                          status = s;
                                          if (status == Status::NO_ERROR) {
                                              utils::convertFromHidlCloned(metadata, &rawMetadata);
                                          }
                                     });
    if (!serviceRet.isOk() || status != Status::NO_ERROR) {
        ALOGE("Get camera characteristics from camera service failed");
        return ACAMERA_ERROR_UNKNOWN; // should not reach here
    }

    *characteristics = new ACameraMetadata(
            rawMetadata.release(), ACameraMetadata::ACM_CHARACTERISTICS);
    return ACAMERA_OK;
}

camera_status_t
ACameraManager::openCamera(
        const char* cameraId,
        ACameraDevice_StateCallbacks* callback,
        /*out*/ACameraDevice** outDevice) {
    sp<ACameraMetadata> rawChars;
    camera_status_t ret = getCameraCharacteristics(cameraId, &rawChars);
    Mutex::Autolock _l(mLock);
    if (ret != ACAMERA_OK) {
        ALOGE("%s: cannot get camera characteristics for camera %s. err %d",
                __FUNCTION__, cameraId, ret);
        return ACAMERA_ERROR_INVALID_PARAMETER;
    }

    ACameraDevice* device = new ACameraDevice(cameraId, callback, std::move(rawChars));

    sp<ICameraService> cs = CameraManagerGlobal::getInstance().getCameraService();
    if (cs == nullptr) {
        ALOGE("%s: Cannot reach camera service!", __FUNCTION__);
        delete device;
        return ACAMERA_ERROR_CAMERA_DISCONNECTED;
    }

    sp<ICameraDeviceCallback> callbacks = device->getServiceCallback();
    sp<ICameraDeviceUser> deviceRemote;

    // No way to get package name from native.
    // Send a zero length package name and let camera service figure it out from UID
    Status status = Status::NO_ERROR;
    auto serviceRet = cs->connectDevice(
            callbacks, cameraId, [&status, &deviceRemote](auto s, auto &device) {
                                     status = s;
                                     deviceRemote = device;
                                 });

    if (!serviceRet.isOk() || status != Status::NO_ERROR) {
        ALOGE("%s: connect camera device failed", __FUNCTION__);
        delete device;
        return utils::convertFromHidl(status);
    }
    if (deviceRemote == nullptr) {
        ALOGE("%s: connect camera device failed! remote device is null", __FUNCTION__);
        delete device;
        return ACAMERA_ERROR_CAMERA_DISCONNECTED;
    }
    device->setRemoteDevice(deviceRemote);
    device->setDeviceMetadataQueues();
    *outDevice = device;
    return ACAMERA_OK;
}

camera_status_t
ACameraManager::getTagFromName(const char *cameraId, const char *name, uint32_t *tag) {
    sp<ACameraMetadata> rawChars;
    camera_status_t ret = getCameraCharacteristics(cameraId, &rawChars);
    if (ret != ACAMERA_OK) {
        ALOGE("%s, Cannot retrieve camera characteristics for camera id %s", __FUNCTION__,
                cameraId);
        return ACAMERA_ERROR_METADATA_NOT_FOUND;
    }
    const CameraMetadata& metadata = rawChars->getInternalData();
    const camera_metadata_t *rawMetadata = metadata.getAndLock();
    metadata_vendor_id_t vendorTagId = get_camera_metadata_vendor_id(rawMetadata);
    metadata.unlock(rawMetadata);
    sp<VendorTagDescriptorCache> vtCache = VendorTagDescriptorCache::getGlobalVendorTagCache();
    sp<VendorTagDescriptor> vTags = nullptr;
    vtCache->getVendorTagDescriptor(vendorTagId, &vTags);
    status_t status= metadata.getTagFromName(name, vTags.get(), tag);
    return status == OK ? ACAMERA_OK : ACAMERA_ERROR_METADATA_NOT_FOUND;
}

ACameraManager::~ACameraManager() {

}