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#include <QtTest/QtTest>
#include <QtNetwork/QtNetwork>
#include <qnetworkdiskcache.h>
#include "../../shared/util.h"

#define EXAMPLE_URL "http://user:pass@www.example.com/#foo"
//cached objects are organized into these many subdirs
#define NUM_SUBDIRECTORIES 16

class tst_QNetworkDiskCache : public QObject
{
    Q_OBJECT

public slots:
    void initTestCase();
    void cleanupTestCase();
    void init();
    void cleanup();

private slots:
    void qnetworkdiskcache_data();
    void qnetworkdiskcache();

    void prepare();
    void cacheSize();
    void clear();
    void data_data();
    void data();
    void metaData();
    void remove();
    void setCacheDirectory_data();
    void setCacheDirectory();
    void updateMetaData();
    void fileMetaData();
    void expire();

    void oldCacheVersionFile_data();
    void oldCacheVersionFile();
    
    void sync();

    void crashWhenParentingCache();
};

// FIXME same as in tst_qnetworkreply.cpp .. could be unified
// Does not work for POST/PUT!
class MiniHttpServer: public QTcpServer
{
    Q_OBJECT
public:
    QTcpSocket *client; // always the last one that was received
    QByteArray dataToTransmit;
    QByteArray receivedData;
    bool doClose;
    bool multiple;
    int totalConnections;

    MiniHttpServer(const QByteArray &data) : client(0), dataToTransmit(data), doClose(true), multiple(false), totalConnections(0)
    {
        listen();
        connect(this, SIGNAL(newConnection()), this, SLOT(doAccept()));
    }

public slots:
    void doAccept()
    {
        client = nextPendingConnection();
        client->setParent(this);
        ++totalConnections;
        connect(client, SIGNAL(readyRead()), this, SLOT(readyReadSlot()));
    }

    void readyReadSlot()
    {
        receivedData += client->readAll();
        int doubleEndlPos = receivedData.indexOf("\r\n\r\n");

        if (doubleEndlPos != -1) {
            // multiple requests incoming. remove the bytes of the current one
            if (multiple)
                receivedData.remove(0, doubleEndlPos+4);

            client->write(dataToTransmit);
            if (doClose) {
                client->disconnectFromHost();
                disconnect(client, 0, this, 0);
                client = 0;
            }
        }
    }
};

// Subclass that exposes the protected functions.
class SubQNetworkDiskCache : public QNetworkDiskCache
{
public:
    ~SubQNetworkDiskCache()
    {
        if (!cacheDirectory().isEmpty())
            clear();
    }

    QNetworkCacheMetaData call_fileMetaData(QString const &fileName)
        { return SubQNetworkDiskCache::fileMetaData(fileName); }

    qint64 call_expire()
        { return SubQNetworkDiskCache::expire(); }

    void setupWithOne(const QUrl &url, const QNetworkCacheMetaData &metaData = QNetworkCacheMetaData())
    {
        setCacheDirectory(QDir::tempPath() + "/diskCache");

        QIODevice *d = 0;
        if (metaData.isValid()) {
            d = prepare(metaData);
        } else {
            QNetworkCacheMetaData m;
            m.setUrl(url);
            QNetworkCacheMetaData::RawHeader header("content-type", "text/html");
            QNetworkCacheMetaData::RawHeaderList list;
            list.append(header);
            m.setRawHeaders(list);
            d = prepare(m);
        }
        d->write("Hello World!");
        insert(d);
    }
};

// This will be called before the first test function is executed.
// It is only called once.
void tst_QNetworkDiskCache::initTestCase()
{
    SubQNetworkDiskCache cache;
    cache.setCacheDirectory(QDir::tempPath() + "/diskCache");
    cache.clear();
    QString s = QDir::tempPath() + "/diskCache/";
    QDir dir;
    dir.rmdir(s + "data7"); // the number is the internal cache version
    dir.rmdir(s + "prepared");
    dir.rmdir(s);
    dir.rmdir(s + "http"); // delete directory used by 4.7 and earlier (would make the tests fail)
}

// This will be called after the last test function is executed.
// It is only called once.
void tst_QNetworkDiskCache::cleanupTestCase()
{
}

// This will be called before each test function is executed.
void tst_QNetworkDiskCache::init()
{
}

// This will be called after every test function.
void tst_QNetworkDiskCache::cleanup()
{
}

void tst_QNetworkDiskCache::qnetworkdiskcache_data()
{
}

void tst_QNetworkDiskCache::qnetworkdiskcache()
{
    QUrl url(EXAMPLE_URL);
    SubQNetworkDiskCache cache;
    QCOMPARE(cache.cacheDirectory(), QString());
    QCOMPARE(cache.cacheSize(), qint64(0));
    cache.clear();
    QCOMPARE(cache.metaData(QUrl()), QNetworkCacheMetaData());
    QCOMPARE(cache.remove(QUrl()), false);
    QCOMPARE(cache.remove(url), false);
    cache.insert((QIODevice*)0);
    cache.setCacheDirectory(QString());
    cache.updateMetaData(QNetworkCacheMetaData());
    cache.prepare(QNetworkCacheMetaData());
    QCOMPARE(cache.call_fileMetaData(QString()), QNetworkCacheMetaData());

    // leave one hanging around...
    QNetworkDiskCache badCache;
    QNetworkCacheMetaData metaData;
    metaData.setUrl(url);
    badCache.prepare(metaData);
    badCache.setCacheDirectory(QDir::tempPath() + "/diskCache");
    badCache.prepare(metaData);
}

void tst_QNetworkDiskCache::prepare()
{
    SubQNetworkDiskCache cache;
    cache.setCacheDirectory(QDir::tempPath() + "/diskCache");

    QUrl url(EXAMPLE_URL);
    QNetworkCacheMetaData metaData;
    metaData.setUrl(url);

    cache.prepare(metaData);
    cache.remove(url);
}

// public qint64 cacheSize() const
void tst_QNetworkDiskCache::cacheSize()
{
    SubQNetworkDiskCache cache;
    cache.setCacheDirectory(QDir::tempPath() + "/diskCache");
    QCOMPARE(cache.cacheSize(), qint64(0));

    QUrl url(EXAMPLE_URL);
    QNetworkCacheMetaData metaData;
    metaData.setUrl(url);
    QIODevice *d = cache.prepare(metaData);
    cache.insert(d);
    QVERIFY(cache.cacheSize() > qint64(0));

    cache.clear();
    QCOMPARE(cache.cacheSize(), qint64(0));
}

static QStringList countFiles(const QString dir)
{
    QStringList list;
    QDir::Filters filter(QDir::AllEntries | QDir::NoDotAndDotDot);
    QDirIterator it(dir, filter, QDirIterator::Subdirectories);
    while (it.hasNext())
        list.append(it.next());
    return list;
}

// public void clear()
void tst_QNetworkDiskCache::clear()
{
    SubQNetworkDiskCache cache;
    QUrl url(EXAMPLE_URL);
    cache.setupWithOne(url);
    QVERIFY(cache.cacheSize() > qint64(0));

    QString cacheDirectory = cache.cacheDirectory();
    QCOMPARE(countFiles(cacheDirectory).count(), NUM_SUBDIRECTORIES + 3);
    cache.clear();
    QCOMPARE(countFiles(cacheDirectory).count(), NUM_SUBDIRECTORIES + 2);

    // don't delete files that it didn't create
    QTemporaryFile file(cacheDirectory + "/XXXXXX");
    if (file.open()) {
        QCOMPARE(countFiles(cacheDirectory).count(), NUM_SUBDIRECTORIES + 3);
        cache.clear();
        QCOMPARE(countFiles(cacheDirectory).count(), NUM_SUBDIRECTORIES + 3);
    }
}

Q_DECLARE_METATYPE(QNetworkCacheMetaData)
void tst_QNetworkDiskCache::data_data()
{
    QTest::addColumn<QNetworkCacheMetaData>("data");

    QTest::newRow("null") << QNetworkCacheMetaData();

    QUrl url(EXAMPLE_URL);
    QNetworkCacheMetaData metaData;
    metaData.setUrl(url);
    QNetworkCacheMetaData::RawHeaderList headers;
    headers.append(QNetworkCacheMetaData::RawHeader("type", "bin"));
    metaData.setRawHeaders(headers);
    QTest::newRow("null") << metaData;
}

// public QIODevice* data(QUrl const& url)
void tst_QNetworkDiskCache::data()
{
    QFETCH(QNetworkCacheMetaData, data);
    SubQNetworkDiskCache cache;
    QUrl url(EXAMPLE_URL);
    cache.setupWithOne(url, data);

    for (int i = 0; i < 3; ++i) {
        QIODevice *d = cache.data(url);
        QVERIFY(d);
        QCOMPARE(d->readAll(), QByteArray("Hello World!"));
        delete d;
    }
}

// public QNetworkCacheMetaData metaData(QUrl const& url)
void tst_QNetworkDiskCache::metaData()
{
    SubQNetworkDiskCache cache;

    QUrl url(EXAMPLE_URL);
    QNetworkCacheMetaData metaData;
    metaData.setUrl(url);
    QNetworkCacheMetaData::RawHeaderList headers;
    headers.append(QNetworkCacheMetaData::RawHeader("type", "bin"));
    metaData.setRawHeaders(headers);
    metaData.setLastModified(QDateTime::currentDateTime());
    metaData.setExpirationDate(QDateTime::currentDateTime());
    metaData.setSaveToDisk(true);

    cache.setupWithOne(url, metaData);

    for (int i = 0; i < 3; ++i) {
        QNetworkCacheMetaData cacheMetaData = cache.metaData(url);
        QVERIFY(cacheMetaData.isValid());
        QCOMPARE(metaData, cacheMetaData);
    }
}

// public bool remove(QUrl const& url)
void tst_QNetworkDiskCache::remove()
{
    SubQNetworkDiskCache cache;
    QUrl url(EXAMPLE_URL);
    cache.setupWithOne(url);
    QString cacheDirectory = cache.cacheDirectory();
    QCOMPARE(countFiles(cacheDirectory).count(), NUM_SUBDIRECTORIES + 3);
    cache.remove(url);
    QCOMPARE(countFiles(cacheDirectory).count(), NUM_SUBDIRECTORIES + 2);
}

void tst_QNetworkDiskCache::setCacheDirectory_data()
{
    QTest::addColumn<QString>("cacheDir");
    QTest::newRow("null") << QString();
    QDir dir("foo");
    QTest::newRow("foo") << dir.absolutePath() + QString("/");
}

// public void setCacheDirectory(QString const& cacheDir)
void tst_QNetworkDiskCache::setCacheDirectory()
{
    QFETCH(QString, cacheDir);

    SubQNetworkDiskCache cache;
    cache.setCacheDirectory(cacheDir);
    QCOMPARE(cache.cacheDirectory(), cacheDir);
}

// public void updateMetaData(QNetworkCacheMetaData const& metaData)
void tst_QNetworkDiskCache::updateMetaData()
{
    QUrl url(EXAMPLE_URL);
    SubQNetworkDiskCache cache;
    cache.setupWithOne(url);

    QNetworkCacheMetaData metaData = cache.metaData(url);
    metaData.setLastModified(QDateTime::currentDateTime());
    cache.updateMetaData(metaData);
    QNetworkCacheMetaData newMetaData = cache.metaData(url);
    QCOMPARE(newMetaData, metaData);
}

// protected QNetworkCacheMetaData fileMetaData(QString const& fileName)
void tst_QNetworkDiskCache::fileMetaData()
{
    SubQNetworkDiskCache cache;
    QUrl url(EXAMPLE_URL);
    cache.setupWithOne(url);

    url.setPassword(QString());
    url.setFragment(QString());

    QString cacheDirectory = cache.cacheDirectory();
    QStringList list = countFiles(cacheDirectory);
    QCOMPARE(list.count(), NUM_SUBDIRECTORIES + 3);
    foreach(QString fileName, list) {
        QFileInfo info(fileName);
        if (info.isFile()) {
            QNetworkCacheMetaData metaData = cache.call_fileMetaData(fileName);
            QCOMPARE(metaData.url(), url);
        }
    }

    QTemporaryFile file(cacheDirectory + "/qt_temp.XXXXXX");
    if (file.open()) {
        QNetworkCacheMetaData metaData = cache.call_fileMetaData(file.fileName());
        QVERIFY(!metaData.isValid());
    }
}

// protected qint64 expire()
void tst_QNetworkDiskCache::expire()
{
    SubQNetworkDiskCache cache;
    cache.setCacheDirectory(QDir::tempPath() + "/diskCache");
    QCOMPARE(cache.call_expire(), (qint64)0);
    QUrl url(EXAMPLE_URL);
    cache.setupWithOne(url);
    QVERIFY(cache.call_expire() > (qint64)0);
    qint64 limit = (1024 * 1024 / 4) * 5;
    cache.setMaximumCacheSize(limit);

    qint64 max = cache.maximumCacheSize();
    QCOMPARE(max, limit);
    for (int i = 0; i < 10; ++i) {
        if (i % 3 == 0)
            QTest::qWait(2000);
        QNetworkCacheMetaData m;
        m.setUrl(QUrl("http://www.foo.com/" + QString::number(i)));
        QIODevice *d = cache.prepare(m);
        QString bigString;
        bigString.fill(QLatin1Char('Z'), (1024 * 1024 / 4));
        d->write(bigString.toLatin1().data());
        cache.insert(d);
        QVERIFY(cache.call_expire() < max);
    }

    QString cacheDirectory = cache.cacheDirectory();
    QStringList list = countFiles(cacheDirectory);
    QStringList cacheList;
    foreach(QString fileName, list) {
        QFileInfo info(fileName);
        if (info.isFile()) {
            QNetworkCacheMetaData metaData = cache.call_fileMetaData(fileName);
            cacheList.append(metaData.url().toString());
        }
    }
    qSort(cacheList);
    for (int i = 0; i < cacheList.count(); ++i) {
        QString fileName = cacheList[i];
        QCOMPARE(fileName, QString("http://www.foo.com/%1").arg(i + 6));
    }
}

void tst_QNetworkDiskCache::oldCacheVersionFile_data()
{
    QTest::addColumn<int>("pass");
    QTest::newRow("0") << 0;
    QTest::newRow("1") << 1;
}

void tst_QNetworkDiskCache::oldCacheVersionFile()
{
    QFETCH(int, pass);
    SubQNetworkDiskCache cache;
    QUrl url(EXAMPLE_URL);
    cache.setupWithOne(url);

    if (pass == 0) {
        QString name;
        {
        QTemporaryFile file(cache.cacheDirectory() + "/XXXXXX.d");
        file.setAutoRemove(false);
        QVERIFY(file.open());
        QDataStream out(&file);
        out << qint32(0xe8);
        out << qint32(2);
        name = file.fileName();
        file.close();
        }

        QVERIFY(QFile::exists(name));
        QNetworkCacheMetaData metaData = cache.call_fileMetaData(name);
        QVERIFY(!metaData.isValid());
        QVERIFY(!QFile::exists(name));
    } else {
        QStringList files = countFiles(cache.cacheDirectory());
        QCOMPARE(files.count(), NUM_SUBDIRECTORIES + 3);
        // find the file
        QString cacheFile;
        foreach (QString file, files) {
            QFileInfo info(file);
            if (info.isFile())
                cacheFile = file;
        }
        QVERIFY(QFile::exists(cacheFile));

        QFile file(cacheFile);
        QVERIFY(file.open(QFile::ReadWrite));
        QDataStream out(&file);
        out << qint32(0xe8);
        out << qint32(2);
        file.close();

        QIODevice *device = cache.data(url);
        QVERIFY(!device);
        QVERIFY(!QFile::exists(cacheFile));
    }
}

class Runner : public QThread
{

public:
    Runner()
        : QThread()
        , other(0)
    {}

    void run()
    {
        QByteArray longString = "Hello World, this is some long string, well not really that long";
        for (int j = 0; j < 10; ++j)
            longString += longString;
        QByteArray longString2 = "Help, I am stuck in an autotest!";
        QUrl url(EXAMPLE_URL);

        QNetworkCacheMetaData metaData;
        metaData.setUrl(url);
        QNetworkCacheMetaData::RawHeaderList headers;
        headers.append(QNetworkCacheMetaData::RawHeader("type", "bin"));
        metaData.setRawHeaders(headers);
        metaData.setLastModified(dt);
        metaData.setSaveToDisk(true);

        QNetworkCacheMetaData metaData2 = metaData;
        metaData2.setExpirationDate(dt);

        QNetworkDiskCache cache;
        cache.setCacheDirectory(QDir::tempPath() + "/diskCache");

        int read = 0;

        int i = 0;
        for (; i < 5000; ++i) {
            if (other && other->isFinished())
                break;

            if (write) {
                QNetworkCacheMetaData m;
                if (qrand() % 2 == 0)
                    m = metaData;
                else
                    m = metaData2;

                if (qrand() % 20 == 1) {
                    //qDebug() << "write update";
                    cache.updateMetaData(m);
                    continue;
                }

                QIODevice *device = cache.prepare(m);
                if (qrand() % 20 == 1) {
                    //qDebug() << "write remove";
                    cache.remove(url);
                    continue;
                }
                QVERIFY(device);
                if (qrand() % 2 == 0)
                    device->write(longString);
                else
                    device->write(longString2);
                //qDebug() << "write write" << device->size();
                cache.insert(device);
                continue;
            }

            QNetworkCacheMetaData gotMetaData = cache.metaData(url);
            if (gotMetaData.isValid()) {
                QVERIFY(gotMetaData == metaData || gotMetaData == metaData2);
                QIODevice *d = cache.data(url);
                if (d) {
                    QByteArray x = d->readAll();
                    if (x != longString && x != longString2) {
                        qDebug() << x.length() << QString(x);
                        gotMetaData = cache.metaData(url);
                        qDebug() << (gotMetaData.url().toString())
                         << gotMetaData.lastModified()
                         << gotMetaData.expirationDate()
                         << gotMetaData.saveToDisk();
                    }
                    if (gotMetaData.isValid())
                        QVERIFY(x == longString || x == longString2);
                    read++;
                    delete d;
                }
            }
            if (qrand() % 5 == 1)
                cache.remove(url);
            if (qrand() % 5 == 1)
                cache.clear();
            sleep(0);
        }
        //qDebug() << "read!" << read << i;
    }

    QDateTime dt;
    bool write;
    Runner *other;
};

void tst_QNetworkDiskCache::crashWhenParentingCache()
{
    // the trick here is to not send the complete response
    // but some data. So we get a readyRead() and it gets tried
    // to be saved to the cache
    QByteArray data("HTTP/1.0 200 OK\r\nCache-Control: max-age=300\r\nAge: 1\r\nContent-Length: 5\r\n\r\n123");
    MiniHttpServer server(data);

    QNetworkAccessManager *manager = new QNetworkAccessManager();
    QNetworkDiskCache *diskCache = new QNetworkDiskCache(manager); // parent to qnam!
    // we expect the temp dir to be cleaned at some point anyway
    diskCache->setCacheDirectory(QString("%1/cacheDir_%2").arg(QDir::tempPath()).arg(QCoreApplication::applicationPid()));
    manager->setCache(diskCache);

    QUrl url("http://127.0.0.1:" + QString::number(server.serverPort()));
    QNetworkRequest request(url);
   // request.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::AlwaysNetwork);
    QNetworkReply *reply = manager->get(request); // new reply is parented to qnam

    // wait for readyRead of reply!
    connect(reply, SIGNAL(readyRead()), &QTestEventLoop::instance(), SLOT(exitLoop()));
    QTestEventLoop::instance().enterLoop(5);
    QVERIFY(!QTestEventLoop::instance().timeout());

    delete manager; // crashed before..
}

void tst_QNetworkDiskCache::sync()
{
    // This tests would be a nice to have, but is currently not supported.
    return;

    QTime midnight(0, 0, 0);
    qsrand(midnight.secsTo(QTime::currentTime()));
    Runner reader;
    reader.dt = QDateTime::currentDateTime();
    reader.write = false;

    Runner writer;
    writer.dt = reader.dt;
    writer.write = true;

    writer.other = &reader;
    reader.other = &writer;

    writer.start();
    reader.start();
    writer.wait();
    reader.wait();
}

QTEST_MAIN(tst_QNetworkDiskCache)
#include "tst_qnetworkdiskcache.moc"