#include "colnodapi.h"

#include <utility>

Q_LOGGING_CATEGORY(colnod, "colnod.api");


ColnodAPI::ColnodAPI(serversdk::RequestManager* reqMan, const bool &dryMode, QString userName, QString password)
    :mReqMan(reqMan), mUserName(std::move(userName)), mPassword(std::move(password)), mDryMode(dryMode)
{
    // -----------------------------------
    mReqMan->setIgnoreSsl(true);
    // -----------------------------------
}

/**
 * @brief Downloads new data from Colnod -> emits downloadDataFinished signal
 * @param time
 *
 * @return signal with nullptr when something went wrong
 * @return signal with data when valid data returned
 */
void ColnodAPI::downloadData(const qint64 &time)
{
    // Have to get Login
    auto login = requestLogin();
    Q_ASSERT(login);
    connect(login.get(), &serversdk::Request::finished, this, [=](){
        // Get login token
        if (login->status() != 200) {
            emit downloadDataFinished(nullptr);
            return;
        }
        AuthToken token;
        auto responseData = login->responseData();
        if (responseData.isEmpty()) {
            qCWarning(colnod) << "empty response data when logging in";
            emit downloadDataFinished(nullptr);
            return;
        }

        token.fromJson(responseData);
        authToken = token.id();
        if (authToken.isEmpty()) {
            qCCritical(colnod) << "Token uuid is empty";
            emit downloadDataFinished(nullptr);
            return;
        }



        // NOTE: why?
//        auto errorHandler = [=](const std::shared_ptr<serversdk::Request>& request){
//            if (!checkRequest(request)) {
//                qWarning(colnod) << "ERROR during calling" << request->url() << ", request unsuccessful";
//                mValid = false;
//                emit downloadDataFinished(nullptr);  // TODO: think about it, will the other if passed?
//            }
//            else if (!checkResponse(request->responseData())) {
//                qWarning(colnod) << "Data from" << request->url() << "are invalid";
//                mValid = false;
//            }
//        };


        // if I have all data emit downloadDataFinished
        connect(this, &ColnodAPI::partOfDataReady, this, &ColnodAPI::areDataReady);

        Timestamp timestamp;
        timestamp.setTimestamp(time);

        auto data = std::make_shared<Data>();
        int dataCount = 0;

        auto checkData = [&dataCount, &data, this]() {
            qDebug() << "check data" << dataCount;
            if (dataCount > 5) {
                qCCritical(colnod) << "check data cannnot be higher then 4";
            }
            Q_ASSERT(dataCount < 5);
            if (dataCount == 4)
                emit downloadDataFinished(data);
        };

        auto tokensRequest = getTokensUpdated(timestamp);
//        connect(tokensRequest.get(), &serversdk::Request::finished, errorHandler);
        connect(tokensRequest.get(), &serversdk::Request::finished, [=, &dataCount](){
            qDebug(colnod) << "tokens finished";
            if (!saveUpdatedTokens(data, tokensRequest->responseData())) {
                emit downloadDataFinished(nullptr);
                return;
            }
            ++dataCount;
            checkData();
            //saveUpdatedTokens(data, tokensRequest->responseData());
            //emit partOfDataReady(data);
        });

        auto deletedTokensRequest = getTokensDeleted(timestamp);
//        connect(deletedTokensRequest.get(), &serversdk::Request::finished, errorHandler);
        connect(deletedTokensRequest.get(), &serversdk::Request::finished, [=, &dataCount](){
            qDebug(colnod) << "tokens finished";
            if (!saveDeletedTokens(data, deletedTokensRequest->responseData())) {
                emit downloadDataFinished(nullptr);
                return;
            }
            ++dataCount;
            checkData();

            //emit partOfDataReady(data);
        });

        auto subjectsRequest = getSubjectsUpdated(timestamp);
//        connect(subjectsRequest.get(), &serversdk::Request::finished, errorHandler);
        connect(subjectsRequest.get(), &serversdk::Request::finished, [=, &dataCount](){
            qDebug(colnod) << "tokens finished";
            if (!saveUpdatedSubjects(data, subjectsRequest->responseData())) {
                emit downloadDataFinished(nullptr);
                return;
            }
            ++dataCount;
            checkData();
        });

        auto deletedSubjectsRequest = getSubjectsDeleted(timestamp);
//        connect(deletedSubjectsRequest.get(), &serversdk::Request::finished, errorHandler);
        connect(deletedSubjectsRequest.get(), &serversdk::Request::finished, [=, &dataCount](){
            qDebug(colnod) << "tokens finished";
            saveDeletedSubjects(data, deletedSubjectsRequest->responseData());
            ++dataCount;
            checkData();
//            emit partOfDataReady(data);
        });
    });
}

void ColnodAPI::processData(const std::shared_ptr<Data> &data)
{
    for (const auto &token : data->updatedTokens) {
        qInfo(colnod).noquote() << Message::massageTemplate("Updating", "token", "colnod", token->name());
    }
    for (const auto &id : data->deletedTokens) {
        qInfo(colnod).noquote() << Message::massageTemplate("Deleting", "token", "colnod", id);
    }
    if (!data->updatedTokens.isEmpty() || !data->deletedTokens.isEmpty()) {
        qInfo(colnod) << dash;
    }
    qInfo(colnod) << tab << "-> DATA PROCESSED TO COLNOD:";
    qInfo(colnod) << tab << tab << data->updatedTokens.size() << "TOKENS UPDATED";
    qInfo(colnod) << tab << tab << data->deletedTokens.size() << "TOKENS DELETED";
    qInfo(colnod) << dash;


    connect(this, &ColnodAPI::partOfDataProcessFinished, this, &ColnodAPI::isDataProcessFinished);
    if ( !data->updatedTokens.isEmpty() && !mDryMode) {
        setTokens(data->updatedTokens);
    } else {
        emit partOfDataProcessFinished();
    }
    if ( !data->deletedTokens.isEmpty() && !mDryMode) {
        deleteTokens(data->deletedTokens);
    } else {
        emit partOfDataProcessFinished();
    }
}

std::shared_ptr<serversdk::Request> ColnodAPI::requestLogin()
{
    Q_ASSERT(mReqMan);
    LoginResp login;
    login.setUsername(userName());

    // password
    QString encodedPassword = QCryptographicHash::hash(
                password().toLocal8Bit(), // -> bytearray
                QCryptographicHash::Sha512 // SHA 512
                ).toHex().toUpper();
    login.setPassword(encodedPassword);

    auto loginRequest = composeRequest("/AaaManager/authSession", login.jsonData());
    loginRequest->setUserName(login.username());
    loginRequest->setPassword(login.password());
    mReqMan->processRequest(loginRequest);

    return loginRequest;
}

std::shared_ptr<serversdk::Request> ColnodAPI::getTokensUpdated(const Timestamp &time)
{
    auto request = composeRequest("/TokenManager/getTokensUpdated", time.jsonData());
    request->setUserName(authToken);
    mReqMan->processRequest(request);
    return request;
}

std::shared_ptr<serversdk::Request> ColnodAPI::getTokensDeleted(const Timestamp &time)
{
    auto request = composeRequest("/TokenManager/getTokensDeleted", time.jsonData());
    request->setUserName(authToken);
    mReqMan->processRequest(request);
    return request;
}

std::shared_ptr<serversdk::Request> ColnodAPI::getSubjectsUpdated(const Timestamp &time)
{
    auto request = composeRequest("/SubjectManager/getSubjectsUpdated", time.jsonData());
    request->setUserName(authToken);
    mReqMan->processRequest(request);
    return request;
}

std::shared_ptr<serversdk::Request> ColnodAPI::getSubjectsDeleted(const Timestamp &time)
{
    auto request = composeRequest("/SubjectManager/getSubjectsDeleted", time.jsonData());
    request->setUserName(authToken);
    mReqMan->processRequest(request);
    return request;
}

std::shared_ptr<serversdk::Request> ColnodAPI::setTokens(const QHash<QString, std::shared_ptr<Token>> &tokens)
{
    auto request = composeRequest("/TokenManager/setTokens", Token::tokensToColnodJson(tokens));
    request->setUserName(authToken);
    mReqMan->processRequest(request);
    connect(request.get(),  &serversdk::Request::finished, [=](){
        if (!checkRequest(request)) {
            qCritical(colnod) << "ERROR during calling /TokenManager/setTokens, request unsuccessful. EXIT";
            emit error();
        }
        if (checkResponse(request->responseData())) {
            emit partOfDataProcessFinished();
        }
        else {
            qWarning(colnod) << "Tokens wasn't updated";
            mValid = false;
            emit partOfDataProcessFinished();
        }
    });
    return request;
}

std::shared_ptr<serversdk::Request> ColnodAPI::deleteTokens(const QList<QString> &ids)
{
    auto request = composeRequest("/TokenManager/deleteTokens", Token::idsToJSON(ids));
    request->setUserName(authToken);
    mReqMan->processRequest(request);
    connect(request.get(),  &serversdk::Request::finished, [=](){
        if (!checkRequest(request)) {
            qCritical(colnod) << "ERROR during calling /TokenManager/deleteTokens, request unsuccessful. EXIT";
            emit error();
        }
        if (checkResponse(request->responseData())) {
            emit partOfDataProcessFinished();
        }
        else {
            qWarning(colnod) << "Tokens wasn't deleted";
            mValid = false;
            emit partOfDataProcessFinished();
        }
    });
    return request;
}

std::shared_ptr<serversdk::Request> ColnodAPI::composeRequest(const QString &endpoint, const QByteArray &data)
{
    QString url = mHost + endpoint;
    return std::make_shared<serversdk::Request>("POST", url, data);
}

bool ColnodAPI::checkRequest(const std::shared_ptr<serversdk::Request> &request)
{
    return request->status() == 200;
}

bool ColnodAPI::isValid()
{
    return mValid;
}

QString ColnodAPI::password() const
{
    return mPassword;
}

void ColnodAPI::setPassword(const QString &password)
{
    mPassword = password;
}

qint64 ColnodAPI::lastSync() const
{
    return mLastSync.timestamp();
}

void ColnodAPI::setlastSync(const qint64 &lastSync)
{
    mLastSync.setTimestamp(lastSync);
}


QString ColnodAPI::userName() const
{
    return mUserName;
}

void ColnodAPI::setUserName(const QString &userName)
{
    mUserName = userName;
}

void ColnodAPI::areDataReady(const std::shared_ptr<Data> &data)
{
    if (++amountData == 4) {

        qInfo(colnod) << tab << "-> COLNOD DATA:";
        qInfo(colnod) << tab << tab << data->updatedTokens.size() << "TOKENS WERE ADDED/UPDATED";
        qInfo(colnod) << tab << tab << data->deletedTokens.size() << "TOKENS DELETED";
        qInfo(colnod) << tab << tab << data->updatedSubjects.size() << "SUBJECTS WERE ADDED/UPDATED";
        qInfo(colnod) << tab << tab << data->deletedSubjects.size() << "SUBJECTS DELETED";
        qInfo(colnod) << dash;

        amountData = 0;
        emit downloadDataFinished(data);
    }
}

void ColnodAPI::isDataProcessFinished()
{
    if (++amountProccessesFinished == 2) {
        emit dataProcessFinished();
    }
}

bool ColnodAPI::saveUpdatedTokens(const std::shared_ptr<Data>& data, const QByteArray &responseData)
{
    Q_ASSERT(data);
    return data->loadTokensFromJson(responseData);
}

bool ColnodAPI::saveDeletedTokens(const std::shared_ptr<Data>& data, const QByteArray &responseData)
{
    Q_ASSERT(data);
    if (responseData.isEmpty())
        return false;
    QJsonDocument doc = QJsonDocument::fromJson(responseData);
    QJsonArray items = doc.object()["items"].toArray();
    for (QJsonValueRef item : items) {
        data->deletedTokens.append(item.toString());
    }
    return true;
}

bool ColnodAPI::saveUpdatedSubjects(const std::shared_ptr<Data>& data, const QByteArray &responseData)
{
    Q_ASSERT(data);
    return data->loadSubjectsFormJson(responseData);
}

bool ColnodAPI::saveDeletedSubjects(const std::shared_ptr<Data>& data, const QByteArray &responseData)
{
    Q_ASSERT(data);
    if (responseData.isEmpty())
        return false;
    QJsonDocument doc = QJsonDocument::fromJson(responseData);
    QJsonArray items = doc.object()["items"].toArray();
    for (QJsonValueRef item : items) {
        data->deletedSubjects.append(item.toString());
    }
    return true;
}

void ColnodAPI::newData()
{
    mData = std::make_shared<Data>();
}

bool ColnodAPI::checkResponse(const QByteArray &responseData)
{
    QJsonDocument doc = QJsonDocument::fromJson(responseData);
    return doc.object().contains("items");
}