/* Copyright 2013-2019 MultiMC Contributors
 *
 * 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 "StatusChecker.h"

#include <net/URLConstants.h>

#include <QByteArray>

#include <QDebug>

StatusChecker::StatusChecker()
{

}

void StatusChecker::timerEvent(QTimerEvent *e)
{
    QObject::timerEvent(e);
    reloadStatus();
}

void StatusChecker::reloadStatus()
{
    if (isLoadingStatus())
    {
        // qDebug() << "Ignored request to reload status. Currently reloading already.";
        return;
    }

    // qDebug() << "Reloading status.";

    NetJob* job = new NetJob("Status JSON");
    job->addNetAction(Net::Download::makeByteArray(URLConstants::MOJANG_STATUS_URL, &dataSink));
    QObject::connect(job, &NetJob::succeeded, this, &StatusChecker::statusDownloadFinished);
    QObject::connect(job, &NetJob::failed, this, &StatusChecker::statusDownloadFailed);
    m_statusNetJob.reset(job);
    emit statusLoading(true);
    job->start();
}

void StatusChecker::statusDownloadFinished()
{
    qDebug() << "Finished loading status JSON.";
    m_statusEntries.clear();
    m_statusNetJob.reset();

    QJsonParseError jsonError;
    QJsonDocument jsonDoc = QJsonDocument::fromJson(dataSink, &jsonError);

    if (jsonError.error != QJsonParseError::NoError)
    {
        fail("Error parsing status JSON:" + jsonError.errorString());
        return;
    }

    if (!jsonDoc.isArray())
    {
        fail("Error parsing status JSON: JSON root is not an array");
        return;
    }

    QJsonArray root = jsonDoc.array();

    for(auto status = root.begin(); status != root.end(); ++status)
    {
        QVariantMap map = (*status).toObject().toVariantMap();

        for (QVariantMap::const_iterator iter = map.begin(); iter != map.end(); ++iter)
        {
            QString key = iter.key();
            QVariant value = iter.value();

            if(value.type() == QVariant::Type::String)
            {
                m_statusEntries.insert(key, value.toString());
                //qDebug() << "Status JSON object: " << key << m_statusEntries[key];
            }
            else
            {
                fail("Malformed status JSON: expected status type to be a string.");
                return;
            }
        }
    }

    succeed();
}

void StatusChecker::statusDownloadFailed(QString reason)
{
    fail(tr("Failed to load status JSON:\n%1").arg(reason));
}


QMap<QString, QString> StatusChecker::getStatusEntries() const
{
    return m_statusEntries;
}

bool StatusChecker::isLoadingStatus() const
{
    return m_statusNetJob.get() != nullptr;
}

QString StatusChecker::getLastLoadErrorMsg() const
{
    return m_lastLoadError;
}

void StatusChecker::succeed()
{
    if(m_prevEntries != m_statusEntries)
    {
        emit statusChanged(m_statusEntries);
        m_prevEntries = m_statusEntries;
    }
    m_lastLoadError = "";
    qDebug() << "Status loading succeeded.";
    m_statusNetJob.reset();
    emit statusLoading(false);
}

void StatusChecker::fail(const QString& errorMsg)
{
    if(m_prevEntries != m_statusEntries)
    {
        emit statusChanged(m_statusEntries);
        m_prevEntries = m_statusEntries;
    }
    m_lastLoadError = errorMsg;
    qDebug() << "Failed to load status:" << errorMsg;
    m_statusNetJob.reset();
    emit statusLoading(false);
}