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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "twittertimelinemodel.h"

#include <QtGui>
#include <QtCore>
#include <QtWidgets>

TwitterTimelineModel::TwitterTimelineModel(QObject *parent)
    : QAbstractTableModel(parent)
{
    connect(&twitter, &Twitter::authenticated, this, &TwitterTimelineModel::authenticated);
    connect(&twitter, &Twitter::authenticated, this, &TwitterTimelineModel::updateTimeline);
}

int TwitterTimelineModel::rowCount(const QModelIndex &parent) const
{
    Q_ASSERT(!parent.isValid());
    return tweets.size();
}

QVariant TwitterTimelineModel::data(const QModelIndex &index, int role) const
{
    if (role != Qt::DisplayRole)
        return QVariant();

    auto it = tweets.begin();
    std::advance(it, index.row());
    switch (index.column())
    {
    case 0:
        return QString::number(it->id);
    case 1:
        return it->createdAt.toString(Qt::SystemLocaleShortDate);
    case 2:
        return it->user;
    case 3:
        return it->text;
    }
    return QVariant();
}

int TwitterTimelineModel::columnCount(const QModelIndex &) const
{
    return 4;
}

QVariant TwitterTimelineModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (role != Qt::DisplayRole)
        return QVariant();
    if (orientation == Qt::Horizontal)
        switch (section) {
        case 0:
            return QStringLiteral("Id");
        case 1:
            return QStringLiteral("Created at");
        case 2:
            return QStringLiteral("User");
        case 3:
            return QStringLiteral("Text");
        }
    return section;
}

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void TwitterTimelineModel::authenticate(const QPair<QString, QString> &clientCredentials)
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{
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    twitter.setClientCredentials(clientCredentials);
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    twitter.grant();
}

QAbstractOAuth::Status TwitterTimelineModel::status() const
{
    return twitter.status();
}

void TwitterTimelineModel::updateTimeline()
{
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    if (twitter.status() != Twitter::Status::Granted)
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        QMessageBox::warning(nullptr, qApp->applicationName(), "Not authenticated");

    QUrl url("https://api.twitter.com/1.1/statuses/home_timeline.json");
    QUrlQuery query;
    if (tweets.size()) {
        query.addQueryItem("since_id", QString::number(tweets.first().id + 1)); // To exclude the
        // last tweet:
        // Returns results with an ID greater than (that is, more recent than) the specified ID.
        // There are limits to the number of Tweets which can be accessed through the API. If the
        // limit of Tweets has occurred since the since_id, the since_id will be forced to the
        // oldest ID available.
    }
    url.setQuery(query);
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    QNetworkReply *reply = twitter.get(url);
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    connect(reply, &QNetworkReply::finished, this, &TwitterTimelineModel::parseJson);
}

void TwitterTimelineModel::parseJson()
{
    QJsonParseError parseError;
    auto reply = qobject_cast<QNetworkReply*>(sender());
    Q_ASSERT(reply);
    const auto data = reply->readAll();
    const auto document = QJsonDocument::fromJson(data, &parseError);
    if (parseError.error) {
        qCritical() << "TwitterTimelineModel::parseJson. Error at:" << parseError.offset
                    << parseError.errorString();
        return;
    }

    if (document.isObject()) {
        // Error received :(
        const auto object = document.object();
        const auto errorArray = object.value("errors").toArray();
        Q_ASSERT_X(errorArray.size(), "parse", data);
        QStringList errors;
        for (const auto error : errorArray) {
            Q_ASSERT(error.isObject());
            errors.append(error.toObject().value("message").toString());
        }
        QMessageBox::warning(nullptr, qApp->applicationName(), errors.join("<br />"));
        return;
    }

    Q_ASSERT_X(document.isArray(), "parse", data);
    const auto array = document.array();
    if (array.size()) {
        beginInsertRows(QModelIndex(), 0, array.size() - 1);
        auto before = tweets.begin();
        for (const auto &value : array) {
            Q_ASSERT(value.isObject());
            const auto object = value.toObject();
            const auto createdAt = QDateTime::fromString(object.value("created_at").toString(),
                                                         "ddd MMM dd HH:mm:ss +0000 yyyy");
            before = tweets.insert(before, Tweet{
                                       object.value("id").toVariant().toULongLong(),
                                       createdAt,
                                       object.value("user").toObject().value("name").toString(),
                                       object.value("text").toString()
                                   });
            std::advance(before, 1);
        }
        endInsertRows();
    }
}