// SPDX-FileCopyrightText: 2023 Filipe Azevedo <pasnox@gmail.com>
//
// SPDX-License-Identifier: GPL-3.0-or-later

// Qt
#include <QFile>
#include <QImage>
#include <QMimeDatabase>
#include <QMimeType>
#include <QSignalSpy>
#include <QTemporaryDir>
#include <QTest>
// Kaidan
#include "FileModel.h"
#include "FileProxyModel.h"
#include "Test.h"

class FileModelTest : public Test
{
    Q_OBJECT

private Q_SLOTS:
    void initTestCase() override
    {
        Test::initTestCase();

        qRegisterMetaType<QPersistentModelIndex>();
        qRegisterMetaType<QList<QPersistentModelIndex>>();
        qRegisterMetaType<QAbstractItemModel::LayoutChangeHint>();

        QVERIFY(m_dir.isValid());
    }

    void cleanupTestCase()
    {
        const QFileInfo fileInfo(m_dir.path());

        m_dir.remove();

        QVERIFY(!fileInfo.exists());
    }

    void testFileProxyModel()
    {
        FileModel model;
        FileProxyModel proxy;

        proxy.setSourceModel(&model);

        // Everything is empty.

        QCOMPARE(model.rowCount(), 0);
        QCOMPARE(proxy.rowCount(), 0);
        QCOMPARE(proxy.mode(), FileProxyModel::Mode::All);

        // Create files backed by local or only remote files.

        const auto localImage1 = createFile(QColor(Qt::red), true);
        const auto localImage2 = createFile(QColor(Qt::green), true);
        const auto localImage3 = createFile(QColor(Qt::blue), true);
        const auto image4 = createFile(QColor(Qt::blue), false);

        const auto localText1 = createFile(QStringLiteral("text1"), true);
        const auto localText2 = createFile(QStringLiteral("text2"), true);
        const auto localText3 = createFile(QStringLiteral("text3"), true);
        const auto text4 = createFile(QStringLiteral("text4"), false);

        QVERIFY(QFile::exists(localImage1.localFilePath));
        QVERIFY(QFile::exists(localImage2.localFilePath));
        QVERIFY(QFile::exists(localImage3.localFilePath));
        QVERIFY(!QFile::exists(image4.localFilePath));

        QVERIFY(QFile::exists(localText1.localFilePath));
        QVERIFY(QFile::exists(localText2.localFilePath));
        QVERIFY(QFile::exists(localText3.localFilePath));
        QVERIFY(!QFile::exists(text4.localFilePath));

        // Set up spies.

        QSignalSpy modelAboutToBeReset(&model, &FileModel::modelAboutToBeReset);
        QSignalSpy modelReset(&model, &FileModel::modelReset);

        QSignalSpy proxyAboutToBeReset(&proxy, &FileProxyModel::modelAboutToBeReset);
        QSignalSpy proxyReset(&proxy, &FileProxyModel::modelReset);
        QSignalSpy proxyLayoutAboutToBeChanged(&proxy, &FileProxyModel::layoutAboutToBeChanged);
        QSignalSpy proxyLayoutChanged(&proxy, &FileProxyModel::layoutChanged);
        QSignalSpy proxyCheckedCountChanged(&proxy, &FileProxyModel::checkedCountChanged);
        QSignalSpy proxyFilesDeleted(&proxy, &FileProxyModel::filesDeleted);

        const auto clearSpies = [&]() {
            modelAboutToBeReset.clear();
            modelReset.clear();
            proxyAboutToBeReset.clear();
            proxyReset.clear();
            proxyLayoutAboutToBeChanged.clear();
            proxyLayoutChanged.clear();
            proxyCheckedCountChanged.clear();
            proxyFilesDeleted.clear();
        };

        // Set files.

        model.setFiles({localImage1, localImage2, image4, localImage3, localText1, localText2, text4, localText3});

        // Check emitted signals and counts.

        QVERIFY(modelAboutToBeReset.count() == 1 || modelAboutToBeReset.wait());
        QVERIFY(modelReset.count() == 1 || modelReset.wait());

        QVERIFY(proxyAboutToBeReset.count() == 1 || proxyAboutToBeReset.wait());
        QVERIFY(proxyReset.count() == 1 || proxyReset.wait());

        QCOMPARE(model.rowCount(), 8);
        // Not downloaded or manually deleted files are not counted.
        QCOMPARE(proxy.rowCount(), 6);

        clearSpies();

        // Check "Images" count.

        proxy.setMode(FileProxyModel::Mode::Images);

        QCOMPARE(proxy.rowCount(), 3);

        clearSpies();

        // Check "Videos" count.

        proxy.setMode(FileProxyModel::Mode::Videos);

        QCOMPARE(proxy.rowCount(), 0);

        clearSpies();

        // Check "Other" count.

        proxy.setMode(FileProxyModel::Mode::Other);

        QCOMPARE(proxy.rowCount(), 3);

        clearSpies();

        // Check "All" count.

        proxy.setMode(FileProxyModel::Mode::All);

        QCOMPARE(proxy.rowCount(), 6);

        clearSpies();

        const QModelIndex localImage1Index = proxy.index(0, 0);
        const QModelIndex localText2Index = proxy.index(5, 0);

        // Check some files for deletion.

        QVERIFY(proxy.setData(localImage1Index, Qt::Checked, Qt::CheckStateRole));
        QVERIFY(proxy.setData(localText2Index, Qt::Checked, Qt::CheckStateRole));

        QVERIFY(proxyCheckedCountChanged.count() == 2 || proxyCheckedCountChanged.wait());
        QVERIFY(proxyCheckedCountChanged.count() == 2);
        QCOMPARE(proxy.checkedCount(), 2);

        clearSpies();

        // Delete checked files.

        proxy.deleteChecked();

        QVERIFY(proxyCheckedCountChanged.count() == 1 || proxyCheckedCountChanged.wait());
        QVERIFY(proxyFilesDeleted.count() == 1 || proxyFilesDeleted.wait());

        QCOMPARE(proxy.checkedCount(), 0);
        // Not downloaded or manually deleted files are not counted.
        QCOMPARE(proxy.rowCount(), 4);

        clearSpies();
    }

private:
    QString filePath(const QColor &color) const
    {
        return m_dir.filePath(QStringLiteral("%1.png").arg(color.name().remove(QStringLiteral("#"))));
    }

    QString filePath(const QString &content) const
    {
        return m_dir.filePath(QStringLiteral("%1.txt").arg(qChecksum(QByteArrayView(content.toUtf8().constData(), content.length()))));
    }

    QImage createImage(const QColor &color) const
    {
        const QFileInfo fileInfo(filePath(color));

        if (fileInfo.exists()) {
            return QImage(fileInfo.filePath());
        }

        QImage img(100, 100, QImage::Format_ARGB32_Premultiplied);
        img.fill(Qt::red);

        Q_ASSERT(img.save(fileInfo.filePath()));

        return img;
    }

    QByteArray createText(const QString &content) const
    {
        QFile file(filePath(content));

        if (file.exists()) {
            if (file.open(QIODevice::ReadOnly)) {
                return file.readAll();
            }

            Q_UNREACHABLE();
        }

        if (file.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
            if (file.write(content.toUtf8()) == -1) {
                file.remove();
                Q_UNREACHABLE();
            }
        }

        return content.toUtf8();
    }

    File createFile(const QColor &color, bool local) const
    {
        if (local) {
            createImage(color);
        }

        const QFileInfo fileInfo(filePath(color));
        File file;

        file.id = qChecksum(QByteArrayView(fileInfo.fileName().toUtf8().constData(), fileInfo.fileName().length()));
        file.fileGroupId = file.id - 10;
        file.name = fileInfo.baseName();
        file.mimeType = m_db.mimeTypeForFile(fileInfo);
        file.size = fileInfo.size();
        file.lastModified = fileInfo.lastModified();
        file.localFilePath = local ? fileInfo.filePath() : QString();
        file.httpSources.append({file.id, QUrl(QStringLiteral("http://kaidan.im/colors/%1").arg(fileInfo.fileName()))});

        return file;
    }

    File createFile(const QString &content, bool local) const
    {
        if (local) {
            createText(content);
        }

        const QFileInfo fileInfo(filePath(content));
        File file;

        file.id = qChecksum(QByteArrayView(fileInfo.fileName().toUtf8().constData(), fileInfo.fileName().length()));
        file.fileGroupId = file.id - 10;
        file.name = fileInfo.baseName();
        file.mimeType = m_db.mimeTypeForFile(fileInfo);
        file.size = fileInfo.size();
        file.lastModified = fileInfo.lastModified();
        file.localFilePath = local ? fileInfo.filePath() : QString();
        file.httpSources.append({file.id, QUrl(QStringLiteral("http://kaidan.im/texts/%1").arg(fileInfo.fileName()))});

        return file;
    }

private:
    QMimeDatabase m_db;
    QTemporaryDir m_dir;
};

QTEST_GUILESS_MAIN(FileModelTest)
#include "FileModelTest.moc"