#include "FlameModel.h"
#include <Json.h>
#include "Application.h"

#include <MMCStrings.h>
#include <Version.h>

#include <QtMath>

namespace Flame {

ListModel::ListModel(QObject* parent) : QAbstractListModel(parent) {}

ListModel::~ListModel() {}

int ListModel::rowCount(const QModelIndex& parent) const
{
    return modpacks.size();
}

int ListModel::columnCount(const QModelIndex& parent) const
{
    return 1;
}

QVariant ListModel::data(const QModelIndex& index, int role) const
{
    int pos = index.row();
    if (pos >= modpacks.size() || pos < 0 || !index.isValid()) {
        return QString("INVALID INDEX %1").arg(pos);
    }

    IndexedPack pack = modpacks.at(pos);
    if (role == Qt::DisplayRole) {
        return pack.name;
    } else if (role == Qt::ToolTipRole) {
        if (pack.description.length() > 100) {
            // some magic to prevent to long tooltips and replace html linebreaks
            QString edit = pack.description.left(97);
            edit = edit.left(edit.lastIndexOf("<br>")).left(edit.lastIndexOf(" ")).append("...");
            return edit;
        }
        return pack.description;
    } else if (role == Qt::DecorationRole) {
        if (m_logoMap.contains(pack.logoName)) {
            return (m_logoMap.value(pack.logoName));
        }
        QIcon icon = APPLICATION->getThemedIcon("screenshot-placeholder");
        ((ListModel*)this)->requestLogo(pack.logoName, pack.logoUrl);
        return icon;
    } else if (role == Qt::UserRole) {
        QVariant v;
        v.setValue(pack);
        return v;
    }

    return QVariant();
}

bool ListModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    int pos = index.row();
    if (pos >= modpacks.size() || pos < 0 || !index.isValid())
        return false;

    modpacks[pos] = value.value<Flame::IndexedPack>();

    return true;
}

void ListModel::logoLoaded(QString logo, QIcon out)
{
    m_loadingLogos.removeAll(logo);
    m_logoMap.insert(logo, out);
    for (int i = 0; i < modpacks.size(); i++) {
        if (modpacks[i].logoName == logo) {
            emit dataChanged(createIndex(i, 0), createIndex(i, 0), { Qt::DecorationRole });
        }
    }
}

void ListModel::logoFailed(QString logo)
{
    m_failedLogos.append(logo);
    m_loadingLogos.removeAll(logo);
}

void ListModel::requestLogo(QString logo, QString url)
{
    if (m_loadingLogos.contains(logo) || m_failedLogos.contains(logo)) {
        return;
    }

    MetaEntryPtr entry = APPLICATION->metacache()->resolveEntry("FlamePacks", QString("logos/%1").arg(logo.section(".", 0, 0)));
    auto job = new NetJob(QString("Flame Icon Download %1").arg(logo), APPLICATION->network());
    job->addNetAction(Net::Download::makeCached(QUrl(url), entry));

    auto fullPath = entry->getFullPath();
    QObject::connect(job, &NetJob::succeeded, this, [this, logo, fullPath, job] {
        job->deleteLater();
        emit logoLoaded(logo, QIcon(fullPath));
        if (waitingCallbacks.contains(logo)) {
            waitingCallbacks.value(logo)(fullPath);
        }
    });

    QObject::connect(job, &NetJob::failed, this, [this, logo, job] {
        job->deleteLater();
        emit logoFailed(logo);
    });

    job->start();

    m_loadingLogos.append(logo);
}

void ListModel::getLogo(const QString& logo, const QString& logoUrl, LogoCallback callback)
{
    if (m_logoMap.contains(logo)) {
        callback(APPLICATION->metacache()->resolveEntry("FlamePacks", QString("logos/%1").arg(logo.section(".", 0, 0)))->getFullPath());
    } else {
        requestLogo(logo, logoUrl);
    }
}

Qt::ItemFlags ListModel::flags(const QModelIndex& index) const
{
    return QAbstractListModel::flags(index);
}

bool ListModel::canFetchMore(const QModelIndex& parent) const
{
    return searchState == CanPossiblyFetchMore;
}

void ListModel::fetchMore(const QModelIndex& parent)
{
    if (parent.isValid())
        return;
    if (nextSearchOffset == 0) {
        qWarning() << "fetchMore with 0 offset is wrong...";
        return;
    }
    performPaginatedSearch();
}

void ListModel::performPaginatedSearch()
{
    NetJob* netJob = new NetJob("Flame::Search", APPLICATION->network());
    auto searchUrl = QString(
                         "https://api.curseforge.com/v1/mods/search?"
                         "gameId=432&"
                         "classId=4471&"
                         "index=%1&"
                         "pageSize=25&"
                         "searchFilter=%2&"
                         "sortField=%3&"
                         "sortOrder=desc")
                         .arg(nextSearchOffset)
                         .arg(currentSearchTerm)
                         .arg(currentSort + 1);

    netJob->addNetAction(Net::Download::makeByteArray(QUrl(searchUrl), &response));
    jobPtr = netJob;
    jobPtr->start();
    QObject::connect(netJob, &NetJob::succeeded, this, &ListModel::searchRequestFinished);
    QObject::connect(netJob, &NetJob::failed, this, &ListModel::searchRequestFailed);
}

void ListModel::searchWithTerm(const QString& term, int sort)
{
    if (currentSearchTerm == term && currentSearchTerm.isNull() == term.isNull() && currentSort == sort) {
        return;
    }
    currentSearchTerm = term;
    currentSort = sort;
    if (jobPtr) {
        jobPtr->abort();
        searchState = ResetRequested;
        return;
    } else {
        beginResetModel();
        modpacks.clear();
        endResetModel();
        searchState = None;
    }
    nextSearchOffset = 0;
    performPaginatedSearch();
}

void Flame::ListModel::searchRequestFinished()
{
    jobPtr.reset();

    QJsonParseError parse_error;
    QJsonDocument doc = QJsonDocument::fromJson(response, &parse_error);
    if (parse_error.error != QJsonParseError::NoError) {
        qWarning() << "Error while parsing JSON response from CurseForge at " << parse_error.offset
                   << " reason: " << parse_error.errorString();
        qWarning() << response;
        return;
    }

    QList<Flame::IndexedPack> newList;
    auto packs = Json::ensureArray(doc.object(), "data");
    for (auto packRaw : packs) {
        auto packObj = packRaw.toObject();

        Flame::IndexedPack pack;
        try {
            Flame::loadIndexedPack(pack, packObj);
            newList.append(pack);
        } catch (const JSONValidationError& e) {
            qWarning() << "Error while loading pack from CurseForge: " << e.cause();
            continue;
        }
    }
    if (packs.size() < 25) {
        searchState = Finished;
    } else {
        nextSearchOffset += 25;
        searchState = CanPossiblyFetchMore;
    }

    // When you have a Qt build with assertions turned on, proceeding here will abort the application
    if (newList.size() == 0)
        return;

    beginInsertRows(QModelIndex(), modpacks.size(), modpacks.size() + newList.size() - 1);
    modpacks.append(newList);
    endInsertRows();
}

void Flame::ListModel::searchRequestFailed(QString reason)
{
    jobPtr.reset();

    if (searchState == ResetRequested) {
        beginResetModel();
        modpacks.clear();
        endResetModel();

        nextSearchOffset = 0;
        performPaginatedSearch();
    } else {
        searchState = Finished;
    }
}

}  // namespace Flame
