#include "NetworkService.h"

#include <QUrlQuery>
#include <QHttpPart>
#include <QNetworkReply>
#include <QJsonObject>
#include <QJsonArray>
#include <QThread>
#include <QSettings>
#include <QTimer>
#include <QTimeZone>

#include "dao/AccountDAO.h"
#include "dao/ApplicationDAO.h"
#include "dao/DeviceDAO.h"
#include "dao/EventDAO.h"
#include "dao/TransactionDAO.h"
#include "db/EventInfo.h"

NetworkService::NetworkService(QObject *parent) : QObject(parent) {
    const QSettings settings("config.ini", QSettings::IniFormat);
    m_urlAccountUpdate = settings.value("net/accountUpdate").toString();
    m_urlPaymentsGet = settings.value("net/paymentsGet").toString();
    m_urlTransactionUpdate = settings.value("net/transactionUpdate").toString();
    m_urlAppStatusUpdate = settings.value("net/appStatusUpdate").toString();
    m_urlTransactionInsert = settings.value("net/transactionInsert").toString();
    m_urlEventStatusUpdate = settings.value("net/eventStatusUpdate").toString();
    m_apiBase = settings.value("net/apiBase").toString();
    m_pathAuthLogin       = settings.value("net/pathAuthLogin",       "/api/v1/auth/login").toString();
    m_pathAuthRefresh     = settings.value("net/pathAuthRefresh",     "/api/v1/auth/refresh_token").toString();
    m_pathDesktopCreate   = settings.value("net/pathDesktopCreate",   "/api/v1/desktop/").toString();
    m_pathDevice          = settings.value("net/pathDevice",          "/api/v1/device/").toString();
    m_pathDeviceScreenshot= settings.value("net/pathDeviceScreenshot","/api/v1/device/add_screenshot/").toString();
    m_pathBankProfile     = settings.value("net/pathBankProfile",     "/api/v1/profile/bank_profile").toString();
    m_pathMaterial        = settings.value("net/pathMaterial",        "/api/v1/profile/material").toString();
    m_manager = new QNetworkAccessManager(this);
    m_token = settings.value("common/token").toString();
    m_accessToken = settings.value("common/access_token").toString();
}

NetworkService::~NetworkService() = default;

// FIXME доделать работу с экстра
void NetworkService::addExtra(const QString &key, const QVariant &value) {
    m_extraData[key] = value;
}

void addFormField(QHttpMultiPart *multiPart, const QString &fieldName, const QString &fieldValue) {
    QHttpPart formField;
    formField.setHeader(
        QNetworkRequest::ContentDispositionHeader,QStringLiteral("form-data; name=\"%1\"").arg(fieldName)
    );
    formField.setBody(fieldValue.toUtf8());
    multiPart->append(formField);
}

void addFormMetadata(QHttpMultiPart *multiPart, const QByteArray &fieldValue) {
    QHttpPart jsonPart;
    jsonPart.setHeader(QNetworkRequest::ContentTypeHeader, "application/json; charset=UTF-8");
    jsonPart.setHeader(QNetworkRequest::ContentDispositionHeader, R"(form-data; name="metadata")");
    jsonPart.setBody(fieldValue);
    multiPart->append(jsonPart);
}

QJsonValue NetworkService::post(QHttpMultiPart *multiPart, const QString &path) {
    const QUrl url(path);
    const QNetworkRequest request(url);

    QNetworkReply *reply = m_manager->post(request, multiPart);
    multiPart->setParent(reply);

    QEventLoop loop;
    connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    connect(reply, &QNetworkReply::errorOccurred, [&loop](QNetworkReply::NetworkError) {
        loop.quit();
    });
    loop.exec(); // <- здесь и запускается event-loop потока

    QJsonValue result;
    if (reply->error() == QNetworkReply::NoError) {
        const QByteArray raw = reply->readAll();
        QJsonParseError err;
        const QJsonDocument doc = QJsonDocument::fromJson(raw, &err);
        if (err.error == QJsonParseError::NoError && doc.isObject()) {
            const QJsonObject root = doc.object();
            if (root.value("success").toBool()) {
                result = root.value("data");
            } else {
                qCritical() << "Ошибка:" << root;
            }
        }
    } else {
        qCritical() << "Ошибка:" << reply->errorString() << path;
    }
    reply->deleteLater();
    return result;
}

QJsonArray NetworkService::get(const QString &path, const QMap<QString, QString> &params) {
    QUrl url(path);
    QUrlQuery query;
    for (auto it = params.constBegin(); it != params.constEnd(); ++it) {
        query.addQueryItem(it.key(), it.value());
    }
    url.setQuery(query);

    const QNetworkRequest request(url);
    QNetworkReply *reply = m_manager->get(request);
    QScopedPointer<QNetworkReply, QScopedPointerDeleteLater> guard(reply);

    QEventLoop loop;
    connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    connect(reply, &QNetworkReply::errorOccurred, [&loop](QNetworkReply::NetworkError) {
        loop.quit();
    });
    loop.exec(); // <- здесь и запускается event-loop потока

    QJsonArray result;
    if (reply->error() == QNetworkReply::NoError) {
        const QByteArray raw = reply->readAll();
        QJsonParseError err;
        const QJsonDocument doc = QJsonDocument::fromJson(raw, &err);
        if (err.error == QJsonParseError::NoError && doc.isObject()) {
            const QJsonObject root = doc.object();
            if (root.value("success").toBool()) {
                result = root.value("data").toArray();
            } else {
                qWarning() << "Ошибка:" << root;
            }
        }
    } else {
        qWarning() << "Ошибка:" << reply->errorString();
    }
    reply->deleteLater();
    return result;
}

void NetworkService::postAccountsData() {
    // TODO: заменить на новый API
    emit finished();
}

void NetworkService::getPayments() {
    QMap<QString, QString> params;
    params["token"] = m_token;
    const QJsonArray data = get(m_urlPaymentsGet, params);

    for (QJsonValue item: data) {
        QJsonObject obj = item.toObject();
        EventInfo eventInfo;
        eventInfo.status = EventStatus::Wait;
        eventInfo.type = eventTypeFromString(obj["type"].toString());
        eventInfo.externalId = obj["id"].toInt();
        eventInfo.timestamp = QDateTime::fromMSecsSinceEpoch(obj["timestamp"].toDouble(), QTimeZone::utc());
        eventInfo.amount = obj["amount"].toDouble();
        eventInfo.bankName = obj["bankName"].toString();
        eventInfo.phone = obj["phone"].toString();

        QString deviceId = obj["deviceId"].toString();
        QString appName = obj["appName"].toString();
        QString lastNumbers = obj["lastNumbers"].toString();
        AccountInfo account = AccountDAO::findAppAccount(deviceId, appName, lastNumbers);

        eventInfo.accountId = account.id;
        eventInfo.deviceId = account.deviceId;

        if (int id = EventDAO::insertEvent(eventInfo); id == -1) {
            qCritical() << "Cant insert event: " << eventInfo.externalId;
        }
    }

    if (!m_running) {
        emit finished();
    }
}

void NetworkService::postAppStatus() {
    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);

    addFormMetadata(multiPart, m_json);
    addFormField(multiPart, "token", m_token);
    addFormField(multiPart, "androidUniqueName", m_deviceId);

    const bool isSuccess = post(multiPart, m_urlAppStatusUpdate).toBool();
    if (!isSuccess) {
        qCritical() << "Cant post data: postAppStatus";
    }

    emit finished();
}

QJsonValue NetworkService::postJson(const QString &path, const QJsonObject &body, bool withAuth) {
    const QUrl url(path);
    QNetworkRequest request(url);
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
    if (withAuth && !m_accessToken.isEmpty()) {
        request.setRawHeader("Authorization", ("Bearer " + m_accessToken).toUtf8());
    }

    QNetworkReply *reply = m_manager->post(request, QJsonDocument(body).toJson());
    QEventLoop loop;
    connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    connect(reply, &QNetworkReply::errorOccurred, [&loop](QNetworkReply::NetworkError) {
        loop.quit();
    });
    loop.exec();

    QJsonValue result;
    if (reply->error() != QNetworkReply::NoError) {
        const QByteArray responseBody = reply->readAll();
        qCritical() << "Network error (POST):" << reply->errorString() << path
                     << "\n  response body:" << responseBody;
        result = QJsonValue::Undefined;
    } else {
        const QByteArray raw = reply->readAll();
        QJsonParseError err;
        const QJsonDocument doc = QJsonDocument::fromJson(raw, &err);
        if (err.error == QJsonParseError::NoError && doc.isObject()) {
            const QJsonObject root = doc.object();
            if (root["success"].toBool()) {
                result = root["data"];
            } else {
                qCritical() << "API error:" << root;
                result = QJsonValue::Null;
            }
        }
    }
    reply->deleteLater();
    return result;
}

void NetworkService::loginAndSetup() {
    QSettings settings("config.ini", QSettings::IniFormat);
    const QString apiKey = settings.value("common/api_key").toString();

    // Шаг 1: логин
    QJsonObject loginBody;
    loginBody["api_key"] = apiKey;
    const QJsonValue loginResult = postJson(m_apiBase + m_pathAuthLogin, loginBody);

    if (loginResult.isUndefined()) {
        emit finishedWithResult(-1); // ошибка сети
        emit finished();
        return;
    }
    if (loginResult.isNull()) {
        emit finishedWithResult(0); // неверный api_key
        emit finished();
        return;
    }

    const QJsonObject loginData = loginResult.toObject();
    m_accessToken = loginData["access_token"].toString();
    settings.setValue("common/access_token", m_accessToken);
    settings.setValue("common/refresh_token", loginData["refresh_token"].toString());
    const qint64 expiresIn = static_cast<qint64>(loginData["expires_in"].toDouble());
    settings.setValue("common/token_expires_at", QDateTime::currentSecsSinceEpoch() + expiresIn);

    // Шаг 2: проверяем есть ли desktop_id
    const QString desktopId = settings.value("common/desktop_id").toString();
    if (!desktopId.isEmpty()) {
        emit finishedWithResult(1);
        emit finished();
        return;
    }

    // Шаг 3: создаём desktop
    QJsonObject desktopBody;
    desktopBody["blue_token"] = QJsonValue::Null;
    desktopBody["name"] = QJsonValue::Null;
    desktopBody["contact"] = QJsonValue::Null;
    desktopBody["app_version"] = settings.value("common/version").toString();
    const QJsonValue desktopResult = postJson(m_apiBase + m_pathDesktopCreate, desktopBody, true);

    if (desktopResult.isUndefined() || desktopResult.isNull()) {
        emit finishedWithResult(-1);
        emit finished();
        return;
    }

    const QJsonObject desktopData = desktopResult.toObject();
    settings.setValue("common/desktop_id", desktopData["id"].toString());
    settings.setValue("common/profile_id", desktopData["profile_id"].toString());

    emit finishedWithResult(1);
    emit finished();
}


void NetworkService::postEventStatus() {
    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);

    addFormMetadata(multiPart, m_json);

    const bool isSuccess = post(multiPart, m_urlEventStatusUpdate).toBool();
    if (!isSuccess) {
        qCritical() << "Cant post data: postEventStatus";
    }

    emit finished();
}

void NetworkService::updateTransactionData() {
    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);

    addFormMetadata(multiPart, m_json);
    addFormField(multiPart, "token", m_token);
    addFormField(multiPart, "androidUniqueName", m_deviceId);
    addFormField(multiPart, "lastNumbers", m_extraData["lastNumbers"].toString());

    const bool isSuccess = post(multiPart, m_urlTransactionUpdate).toBool();
    if (!isSuccess) {
        qCritical() << "Cant update transaction: updateTransactionData";
    }

    emit finished();
}

void NetworkService::insertTransactionData() {
    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);

    addFormMetadata(multiPart, m_json);
    addFormField(multiPart, "token", m_token);
    addFormField(multiPart, "androidUniqueName", m_deviceId);
    addFormField(multiPart, "lastNumbers", m_extraData["lastNumbers"].toString());

    const int id = post(multiPart, m_urlTransactionInsert).toInt();
    if (id > 0) {
        const int transactionId = m_extraData["transactionId"].toInt();
        if (!TransactionDAO::updateExternalTransactionId(transactionId, id)) {
            qCritical() << "Cant update transaction id: " << id;
        }
    }
    emit finished();
}

QJsonValue NetworkService::patchJson(const QString &path, const QJsonObject &body, bool withAuth) {
    const QUrl url(path);
    QNetworkRequest request(url);
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
    if (withAuth && !m_accessToken.isEmpty()) {
        request.setRawHeader("Authorization", ("Bearer " + m_accessToken).toUtf8());
    }

    QNetworkReply *reply = m_manager->sendCustomRequest(request, "PATCH", QJsonDocument(body).toJson());
    QEventLoop loop;
    connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    connect(reply, &QNetworkReply::errorOccurred, [&loop](QNetworkReply::NetworkError) { loop.quit(); });
    loop.exec();

    QJsonValue result;
    if (reply->error() != QNetworkReply::NoError) {
        const QByteArray responseBody = reply->readAll();
        qCritical() << "Network error (PATCH):" << reply->errorString() << path
                     << "\n  response body:" << responseBody;
    } else {
        const QByteArray raw = reply->readAll();
        QJsonParseError err;
        const QJsonDocument doc = QJsonDocument::fromJson(raw, &err);
        if (err.error == QJsonParseError::NoError && doc.isObject()) {
            const QJsonObject root = doc.object();
            if (root["success"].toBool()) {
                result = root["data"];
            } else {
                qCritical() << "API error (PATCH):" << root;
            }
        }
    }
    reply->deleteLater();
    return result;
}

void NetworkService::postBankProfile() {
    if (!ensureValidToken()) { emit finished(); return; }

    const QJsonObject body = QJsonDocument::fromJson(m_json).object();
    qDebug() << "[NetworkService] postBankProfile payload:" << QJsonDocument(body).toJson(QJsonDocument::Compact);
    const QJsonValue result = postJson(m_apiBase + m_pathBankProfile, body, true);
    if (result.isNull() || result.isUndefined()) {
        qWarning() << "[NetworkService] postBankProfile failed";
    } else {
        const QJsonObject data = result.toObject();
        const QString bankProfileId = data["id"].toString();
        const int appId = m_extraData.value("app_id").toInt();
        if (!bankProfileId.isEmpty() && appId > 0) {
            ApplicationDAO::updateBankProfileId(appId, bankProfileId);
            qDebug() << "[NetworkService] postBankProfile saved bank_profile_id:" << bankProfileId;
        }
    }

    emit finished();
}

void NetworkService::patchBankProfile() {
    if (!ensureValidToken()) { emit finished(); return; }

    const QString bankProfileId = m_extraData.value("bank_profile_id").toString();
    if (bankProfileId.isEmpty()) {
        qWarning() << "[NetworkService] patchBankProfile: bank_profile_id is empty";
        emit finished();
        return;
    }

    const QJsonObject body = QJsonDocument::fromJson(m_json).object();
    patchJson(m_apiBase + m_pathBankProfile + "/" + bankProfileId, body, true);
    qDebug() << "[NetworkService] patchBankProfile done for id:" << bankProfileId;

    emit finished();
}

void NetworkService::postMaterial() {
    if (!ensureValidToken()) { emit finished(); return; }

    const QJsonObject body = QJsonDocument::fromJson(m_json).object();
    qDebug() << "[NetworkService] postMaterial body:" << QJsonDocument(body).toJson(QJsonDocument::Compact);
    const QJsonValue result = postJson(m_apiBase + m_pathMaterial, body, true);
    if (result.isNull() || result.isUndefined()) {
        qWarning() << "[NetworkService] postMaterial failed, card:" << body["card_number"].toString();
    } else {
        const QString materialId = result.toObject()["id"].toString();
        const int accountId = m_extraData.value("account_id").toInt();
        if (!materialId.isEmpty() && accountId > 0) {
            AccountDAO::updateMaterialId(accountId, materialId);
        }
        qDebug() << "[NetworkService] postMaterial ok, card:" << body["card_number"].toString() << "material_id:" << materialId;
    }

    emit finished();
}

void NetworkService::postDeviceScreenshot() {
    if (!ensureValidToken()) { emit finished(); return; }

    const DeviceInfo device = DeviceDAO::getDeviceById(m_deviceId);
    if (device.apiId.isEmpty()) {
        qWarning() << "[NetworkService] postDeviceScreenshot: no api_id for" << m_deviceId;
        emit finished();
        return;
    }
    if (m_json.isEmpty()) {
        qWarning() << "[NetworkService] postDeviceScreenshot: no image data";
        emit finished();
        return;
    }

    auto *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
    QHttpPart filePart;
    filePart.setHeader(QNetworkRequest::ContentTypeHeader, "image/jpeg");
    filePart.setHeader(
        QNetworkRequest::ContentDispositionHeader,
        QStringLiteral("form-data; name=\"file\"; filename=\"%1.jpg\"").arg(m_deviceId)
    );
    filePart.setBody(m_json);
    multiPart->append(filePart);

    const QUrl url(m_apiBase + m_pathDeviceScreenshot + device.apiId);
    QNetworkRequest request(url);
    request.setRawHeader("Authorization", ("Bearer " + m_accessToken).toUtf8());

    QNetworkReply *reply = m_manager->post(request, multiPart);
    multiPart->setParent(reply);

    QEventLoop loop;
    connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    connect(reply, &QNetworkReply::errorOccurred, [&loop](QNetworkReply::NetworkError) {
        loop.quit();
    });
    loop.exec();

    if (reply->error() != QNetworkReply::NoError) {
        qWarning() << "[NetworkService] postDeviceScreenshot failed:" << reply->errorString();
    } else {
        qDebug() << "[NetworkService] postDeviceScreenshot ok for device" << device.apiId;
    }
    reply->deleteLater();
    emit finished();
}

void NetworkService::createDevice() {
    const QSettings settings("config.ini", QSettings::IniFormat);
    const QString desktopId = settings.value("common/desktop_id").toString();
    if (desktopId.isEmpty()) {
        qWarning() << "createDevice: desktop_id not set";
        emit finished();
        return;
    }

    const QJsonObject body = QJsonDocument::fromJson(m_json).object();
    const QJsonValue result = postJson(m_apiBase + m_pathDevice, body, true);

    if (!result.isNull() && !result.isUndefined()) {
        const QString apiId = result.toObject()["id"].toString();
        if (!apiId.isEmpty() && !m_deviceId.isEmpty()) {
            DeviceDAO::updateApiId(m_deviceId, apiId);
            qDebug() << "createDevice: saved api_id" << apiId << "for" << m_deviceId;
        }
    }

    emit finished();
}

void NetworkService::updateDevice() {
    const DeviceInfo device = DeviceDAO::getDeviceById(m_deviceId);
    if (device.apiId.isEmpty()) {
        qWarning() << "updateDevice: api_id not set for" << m_deviceId;
        emit finished();
        return;
    }

    const QJsonObject body = QJsonDocument::fromJson(m_json).object();
    patchJson(m_apiBase + m_pathDevice + device.apiId, body, true);

    emit finished();
}

bool NetworkService::refreshToken() {
    QSettings settings("config.ini", QSettings::IniFormat);
    const QString storedRefreshToken = settings.value("common/refresh_token").toString();
    if (storedRefreshToken.isEmpty()) {
        qWarning() << "refreshToken: refresh_token отсутствует";
        return false;
    }

    QJsonObject body;
    body["refresh_token"] = storedRefreshToken;
    const QJsonValue result = postJson(m_apiBase + m_pathAuthRefresh, body);

    if (result.isNull() || result.isUndefined()) {
        qCritical() << "refreshToken: не удалось обновить токен";
        if (!m_tokenErrorShown) {
            m_tokenErrorShown = true;
            emit tokenRefreshFailed();
        }
        return false;
    }

    const QJsonObject data = result.toObject();
    m_accessToken = data["access_token"].toString();
    settings.setValue("common/access_token", m_accessToken);
    settings.setValue("common/refresh_token", data["refresh_token"].toString());
    const qint64 expiresIn = static_cast<qint64>(data["expires_in"].toDouble());
    settings.setValue("common/token_expires_at", QDateTime::currentSecsSinceEpoch() + expiresIn);

    m_tokenErrorShown = false; // сбрасываем если снова заработало
    qDebug() << "refreshToken: токен обновлён, истекает через" << expiresIn << "сек";
    return true;
}

bool NetworkService::ensureValidToken() {
    const QSettings settings("config.ini", QSettings::IniFormat);
    const qint64 expiresAt = settings.value("common/token_expires_at", 0).toLongLong();
    const qint64 now = QDateTime::currentSecsSinceEpoch();

    // Обновляем заранее — за 30 минут до истечения
    if (expiresAt - now < 30 * 60) {
        qDebug() << "ensureValidToken: токен истекает через" << (expiresAt - now) << "сек, обновляем";
        return refreshToken();
    }
    return true;
}

void NetworkService::scheduleNextRefresh() {
    if (!m_running) return;

    const QSettings settings("config.ini", QSettings::IniFormat);
    const qint64 expiresAt = settings.value("common/token_expires_at", 0).toLongLong();
    const qint64 now = QDateTime::currentSecsSinceEpoch();

    // Обновляем за 30 минут до истечения; если уже пора — сразу
    const qint64 secsUntilRefresh = qMax<qint64>(0, expiresAt - now - 30 * 60);
    qDebug() << "scheduleNextRefresh: следующий рефреш через" << secsUntilRefresh << "сек"
             << "(" << secsUntilRefresh / 3600 << "ч" << (secsUntilRefresh % 3600) / 60 << "мин)";

    QTimer::singleShot(secsUntilRefresh * 1000, this, [this]() {
        if (!m_running) return;

        if (refreshToken()) {
            scheduleNextRefresh(); // успех — планируем следующий
        } else {
            // Ошибка — повторяем через 60 секунд
            qWarning() << "scheduleNextRefresh: повтор через 60 сек";
            QTimer::singleShot(60 * 1000, this, [this]() {
                scheduleNextRefresh();
            });
        }
    });
}

void NetworkService::start() {
    m_running = true;

    // Проверяем токен при старте и планируем рефреш по времени жизни
    ensureValidToken();
    scheduleNextRefresh();

    // TODO: GET /api/v1/task/get_tasks (polling)
}

void NetworkService::stop() {
    m_running = false;
    // Эмитируем finished() в потоке NetworkService, чтобы корректно завершить QThread
    QMetaObject::invokeMethod(this, [this]() { emit finished(); }, Qt::QueuedConnection);
}