/*
* Copyright (c) 2021-2024 Huawei Device Co., Ltd.
* 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 "notification_clone_manager.h"

#include <fcntl.h>
#include <unistd.h>
#include <fstream>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sendfile.h>

#include "ans_log_wrapper.h"
#include "nlohmann/json.hpp"
#include "notification_clone_disturb_service.h"
#include "notification_clone_bundle_service.h"

namespace OHOS {
namespace Notification {

const int ANS_CLONE_ERROR = -1;
constexpr const char *CLONE_ITEM_BUNDLE_INFO = "notificationBundle";
constexpr const char *CLONE_ITEM_DISTURB = "notificationDisturb";
constexpr const char *BACKUP_CONFIG_FILE_PATH = "/data/service/el1/public/notification/backup_config.conf";

NotificationCloneManager& NotificationCloneManager::GetInstance()
{
    static NotificationCloneManager notificationCloneManager;
    return notificationCloneManager;
}

int32_t NotificationCloneManager::OnBackup(MessageParcel& data, MessageParcel& reply)
{
    if (cloneTemplates.empty()) {
        ANS_LOGI("Notification no need Backup.");
        return ERR_OK;
    }

    nlohmann::json jsonObject;
    for (auto iter = cloneTemplates.begin(); iter != cloneTemplates.end(); ++iter) {
        nlohmann::json jsonItem;
        auto cloneTemplate = iter->second;
        if (cloneTemplate == nullptr) {
            ANS_LOGW("Notification OnBackup %{public}s funtion is null.", iter->first.c_str());
            continue;
        }
        if (iter->second->OnBackup(jsonItem) != ERR_OK) {
            ANS_LOGW("Notification OnBackup %{public}s failed.", iter->first.c_str());
            continue;
        }
        jsonObject[iter->first] = jsonItem;
    }

    if (SaveConfig(jsonObject.dump()) != ERR_OK) {
        return ANS_CLONE_ERROR;
    }

    UniqueFd fd = UniqueFd(open(BACKUP_CONFIG_FILE_PATH, O_RDONLY));
    if (fd.Get() < 0) {
        ANS_LOGW("Notification open file failed.");
        return ANS_CLONE_ERROR;
    }

    if (reply.WriteFileDescriptor(fd) == false) {
        close(fd.Release());
        ANS_LOGW("Notification write file descriptor failed!");
        return ANS_CLONE_ERROR;
    }

    ANS_LOGI("Notification OnBackup end fd: %{public}d.", fd.Get());
    close(fd.Release());
    return ERR_OK;
}

int32_t NotificationCloneManager::OnRestore(MessageParcel& data, MessageParcel& reply)
{
    std::string storeMessage;
    UniqueFd fd(data.ReadFileDescriptor());
    if (LoadConfig(fd, storeMessage) != ERR_OK) {
        close(fd.Release());
        RemoveBackUpFile();
        return ANS_CLONE_ERROR;
    }

    RemoveBackUpFile();
    nlohmann::json jsonObject = nlohmann::json::parse(storeMessage, nullptr, false);
    if (jsonObject.is_null() || !jsonObject.is_object()) {
        ANS_LOGE("Invalid JSON object");
        return ANS_CLONE_ERROR;
    }
    for (auto iter = cloneTemplates.begin(); iter != cloneTemplates.end(); ++iter) {
        if (jsonObject.contains(iter->first) && iter->second != nullptr) {
            iter->second->OnRestore(jsonObject.at(iter->first));
        }
    }
    return ERR_OK;
}

NotificationCloneManager::NotificationCloneManager()
{
    ANS_LOGI("Notification clone manager init.");
    cloneTemplates.insert_or_assign(CLONE_ITEM_BUNDLE_INFO, NotificationCloneBundle::GetInstance());
    cloneTemplates.insert_or_assign(CLONE_ITEM_DISTURB, NotificationCloneDisturb::GetInstance());
}

NotificationCloneManager::~NotificationCloneManager()
{
    ANS_LOGI("Notification clone manager destory.");
}

ErrCode NotificationCloneManager::LoadConfig(UniqueFd &fd, std::string& config)
{
    ANS_LOGI("Load notification config.");
    struct stat statBuf;
    if (fstat(fd.Get(), &statBuf) < 0) {
        ANS_LOGW("LoadConfig fstat fd fail %{public}d.", fd.Get());
        return ANS_CLONE_ERROR;
    }
    int destFd = open(BACKUP_CONFIG_FILE_PATH, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
    if (destFd < 0) {
        ANS_LOGW("LoadConfig open file fail.");
        return ANS_CLONE_ERROR;
    }
    if (sendfile(destFd, fd.Get(), nullptr, statBuf.st_size) < 0) {
        ANS_LOGW("LoadConfig fd sendfile(size: %{public}d) to destFd fail.", static_cast<int>(statBuf.st_size));
        close(destFd);
        return ANS_CLONE_ERROR;
    }
    close(destFd);
    std::ifstream fs(BACKUP_CONFIG_FILE_PATH);
    if (!fs.is_open()) {
        ANS_LOGW("Loading config file%{public}s is_open() failed!", BACKUP_CONFIG_FILE_PATH);
        return ANS_CLONE_ERROR;
    }
    config.clear();
    std::string line;
    while (std::getline(fs, line)) {
        config.append(line);
    }
    fs.close();
    return ERR_OK;
}

ErrCode NotificationCloneManager::SaveConfig(const std::string& config)
{
    ANS_LOGD("Save config file %{public}s", config.c_str());
    RemoveBackUpFile();
    FILE* fp = fopen(BACKUP_CONFIG_FILE_PATH, "w");
    if (!fp) {
        ANS_LOGW("Save config file: %{public}s, fopen() failed!", BACKUP_CONFIG_FILE_PATH);
        return ANS_CLONE_ERROR;
    }

    int ret = fwrite(config.c_str(), 1, config.length(), fp);
    if (ret != (int)config.length()) {
        ANS_LOGW("Save config file: %{public}s, fwrite %{public}d failed!", BACKUP_CONFIG_FILE_PATH, ret);
    }
    (void)fflush(fp);
    (void)fsync(fileno(fp));
    (void)fclose(fp);
    ANS_LOGI("Save config file %{public}zu", config.size());
    return ERR_OK;
}

void NotificationCloneManager::RemoveBackUpFile()
{
    remove(BACKUP_CONFIG_FILE_PATH);
}

void NotificationCloneManager::OnUserSwitch(int32_t userId)
{
    for (auto iter = cloneTemplates.begin(); iter != cloneTemplates.end(); ++iter) {
        iter->second->OnUserSwitch(userId);
    }
}
}
}