#include "server_config_dialog.h"
#include <QCoreApplication>
#include <QGridLayout>
#include <QNetworkInterface>
#include <QHostInfo>
#include <QHostAddress>
#include <QSettings>
#include <QPalette>
#include <QIntValidator>
#include <QFormLayout>
#include <QBitmap>
#include <QPainter>

#include "startup.h"
#include "yacreader_global_gui.h"

#include "qnaturalsorting.h"

#include <algorithm>

// 192.168 (most comon local subnet for ips are always put first)
// IPs are sorted using natoral sorting
bool ipComparator(const QString &ip1, const QString &ip2)
{
    if (ip1.startsWith("192.168") && ip2.startsWith("192.168"))
        return naturalSortLessThanCI(ip1, ip2);

    if (ip1.startsWith("192.168"))
        return true;

    if (ip2.startsWith("192.168"))
        return false;

    return naturalSortLessThanCI(ip1, ip2);
}

#ifndef Q_OS_WIN32

#include <sys/types.h>
#include <ifaddrs.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>

QList<QString> addresses()
{
    struct ifaddrs *ifAddrStruct = NULL;
    struct ifaddrs *ifa = NULL;
    void *tmpAddrPtr = NULL;

    QList<QString> localAddreses;

    getifaddrs(&ifAddrStruct);

    for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) {
        if (ifa->ifa_addr) {
            if (ifa->ifa_addr->sa_family == AF_INET) { // check it is IP4
                // is a valid IP4 Address
                tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
                char addressBuffer[INET_ADDRSTRLEN];
                inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
                localAddreses.push_back(QString(addressBuffer));
                // printf("%s IP Address %s\n", ifa->ifa_name, addressBuffer);
            } else if (ifa->ifa_addr->sa_family == AF_INET6) { // check it is IP6
                // is a valid IP6 Address
                tmpAddrPtr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
                char addressBuffer[INET6_ADDRSTRLEN];
                inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
                // printf("%s IP Address %s\n", ifa->ifa_name, addressBuffer);
            }
        }
    }
    if (ifAddrStruct != NULL)
        freeifaddrs(ifAddrStruct);
    return localAddreses;
}

#endif

extern Startup *s;

ServerConfigDialog::ServerConfigDialog(QWidget *parent)
    : QDialog(parent)
{
    accept = new QPushButton(tr("set port"), this);
    qrCode = new QLabel(this);
    qrCode->move(64, 112);
    qrCode->setFixedSize(200, 200);
    qrCode->setScaledContents(true);

    QLabel *title1 = new QLabel(tr("Server connectivity information"), this);
    title1->move(332, 61);
    title1->setStyleSheet("QLabel {color:#474747; font-size:30px; font-family: Arial;}");

    QLabel *qrMessage = new QLabel(tr("Scan it!"), this);
    qrMessage->move(135, 388); // 373,627);
    qrMessage->setStyleSheet("QLabel {color:#A3A3A3; font-size:18px; font-family: Arial;}");
    qrMessage->setWordWrap(true);
    qrMessage->setFixedWidth(200);

    QLabel *propaganda = new QLabel(tr("YACReader is available for iOS devices. <a href='http://ios.yacreader.com' style='color:rgb(193, 148, 65)'> Discover it! </a>"), this);
    propaganda->move(332, 505);
    propaganda->setStyleSheet("QLabel {color:#4D4D4D; font-size:13px; font-family: Arial; font-style: italic;}");
    /*propaganda->setWordWrap(true);
    propaganda->setFixedWidth(590);*/
    propaganda->setOpenExternalLinks(true);

    // FORM---------------------------------------------------------------------

    QLabel *ipLabel = new QLabel(tr("Choose an IP address"), this);
    ipLabel->move(332, 117);
    ipLabel->setStyleSheet("QLabel {color:#575757; font-size:18px; font-family: Arial;}");

    QLabel *portLabel = new QLabel(tr("Port"), this);
    portLabel->move(332, 211);
    portLabel->setStyleSheet("QLabel {color:#575757; font-size:18px; font-family: Arial;}");

    ip = new QComboBox(this);
    connect(ip, QOverload<const QString &>::of(&QComboBox::activated), this, &ServerConfigDialog::regenerateQR);

    ip->setFixedWidth(200);
    ip->move(332, 153);

    port = new QLineEdit("8080", this);
    port->setReadOnly(false);
    // port->setFixedWidth(100);
    // port->move(332, 244);

    // port->move(520,110);
    QValidator *validator = new QIntValidator(1024, 65535, this);
    port->setValidator(validator);

    QWidget *portWidget = new QWidget(this);
    auto portWidgetLayout = new QHBoxLayout(this);
    portWidgetLayout->addWidget(port);
    portWidgetLayout->addWidget(accept);
    portWidgetLayout->setContentsMargins(0, 0, 0, 0);
    portWidget->setLayout(portWidgetLayout);
    portWidget->move(332, 244);
    // accept->move(514,149);
    connect(accept, &QAbstractButton::pressed, this, &ServerConfigDialog::updatePort);
    // END FORM-----------------------------------------------------------------

    check = new QCheckBox(this);
    check->move(332, 314);
    check->setText(tr("enable the server"));
    check->setStyleSheet("QCheckBox {color:#262626; font-size:13px; font-family: Arial;}");

    performanceWorkaroundCheck = new QCheckBox(this);
    performanceWorkaroundCheck->move(332, 354);
    performanceWorkaroundCheck->setText(tr("display less information about folders in the browser\nto improve the performance"));
    performanceWorkaroundCheck->setStyleSheet("QCheckBox {color:#262626; font-size:13px; font-family: Arial;}");

    // set black background
    QPalette palette;
    QImage image(":/images/serverConfigBackground.png");
    palette.setBrush(this->backgroundRole(), QBrush(image));

    setPalette(palette);

    this->setFixedSize(image.size());

    QSettings *settings = new QSettings(YACReader::getSettingsPath() + "/YACReaderLibrary.ini", QSettings::IniFormat); // TODO unificar la creación del fichero de config con el servidor
    settings->beginGroup("libraryConfig");

    if (settings->value(SERVER_ON, true).toBool()) {
        check->setChecked(true);
        generateQR();
    } else
        check->setChecked(false);

    performanceWorkaroundCheck->setChecked(settings->value(REMOTE_BROWSE_PERFORMANCE_WORKAROUND, false).toBool());

    settings->endGroup();

    connect(check, &QCheckBox::stateChanged, this, &ServerConfigDialog::enableServer);
    connect(performanceWorkaroundCheck, &QCheckBox::stateChanged, this, &ServerConfigDialog::enableperformanceWorkaround);
}

void ServerConfigDialog::enableServer(int status)
{
    QSettings *settings = new QSettings(YACReader::getSettingsPath() + "/YACReaderLibrary.ini", QSettings::IniFormat); // TODO unificar la creación del fichero de config con el servidor
    settings->beginGroup("libraryConfig");

    if (status == Qt::Checked) {
        s->start();
        this->generateQR();
        settings->setValue(SERVER_ON, true);
    } else {
        s->stop();
        qrCode->setPixmap(QPixmap());
        ip->clear();
        port->setText("");
        settings->setValue(SERVER_ON, false);
    }
    settings->endGroup();
}

void ServerConfigDialog::enableperformanceWorkaround(int status)
{
    QSettings *settings = new QSettings(YACReader::getSettingsPath() + "/YACReaderLibrary.ini", QSettings::IniFormat); // TODO unificar la creación del fichero de config con el servidor
    settings->beginGroup("libraryConfig");

    if (status == Qt::Checked) {
        settings->setValue(REMOTE_BROWSE_PERFORMANCE_WORKAROUND, true);
    } else {
        settings->setValue(REMOTE_BROWSE_PERFORMANCE_WORKAROUND, false);
    }
    settings->endGroup();
}

void ServerConfigDialog::generateQR()
{
    ip->clear();
    QString dir;

#ifdef Q_OS_WIN32
    QList<QHostAddress> list = QHostInfo::fromName(QHostInfo::localHostName()).addresses();

    QList<QString> otherAddresses;
    foreach (QHostAddress add, list) {
        QString tmp = add.toString();
        if (tmp.contains(".") && !tmp.startsWith("127")) {
            otherAddresses.push_back(tmp);
        }
    }

#else
    QList<QString> list = addresses();

    QList<QString> otherAddresses;
    foreach (QString add, list) {
        QString tmp = add;
        if (tmp.contains(".") && !tmp.startsWith("127")) {
            otherAddresses.push_back(tmp);
        }
    }
#endif

    std::sort(otherAddresses.begin(), otherAddresses.end(), ipComparator);

    if (!otherAddresses.isEmpty()) {
        dir = otherAddresses.first();
        otherAddresses.pop_front();
    }

    if (otherAddresses.length() > 0 || !dir.isEmpty()) {
        if (!dir.isEmpty()) {
            generateQR(dir + ":" + s->getPort());

            ip->addItem(dir);
        } else {
            generateQR(otherAddresses.first() + ":" + s->getPort());
        }
        ip->addItems(otherAddresses);
        port->setText(s->getPort());
    }
}

void ServerConfigDialog::generateQR(const QString &serverAddress)
{
    qrCode->clear();

    QrEncoder encoder;
    QBitmap image = encoder.encode(serverAddress);
    if (image.isNull()) {
        qrCode->setText(tr("Could not load libqrencode."));
    } else {
        image = image.scaled(qrCode->size() * devicePixelRatio());

        QPixmap pMask(image.size());
        pMask.fill(QColor(66, 66, 66));
        pMask.setMask(image.createMaskFromColor(Qt::white));
        pMask.setDevicePixelRatio(devicePixelRatio());

        qrCode->setPixmap(pMask);
    }
}

void ServerConfigDialog::regenerateQR(const QString &ip)
{
    generateQR(ip + ":" + s->getPort());
}

void ServerConfigDialog::updatePort()
{

    QSettings *settings = new QSettings(YACReader::getSettingsPath() + "/YACReaderLibrary.ini", QSettings::IniFormat); // TODO unificar la creación del fichero de config con el servidor
    settings->beginGroup("listener");
    settings->setValue("port", port->text().toInt());
    settings->endGroup();

    s->stop();
    s->start();

    generateQR(ip->currentText() + ":" + port->text());
}

QrEncoder::QrEncoder()
{
#ifdef Q_OS_MACOS
    QLibrary encoder(QCoreApplication::applicationDirPath() + "/utils/libqrencode.dylib");
#else
    QLibrary encoder("qrencode");
#endif
    QRcode_encodeString8bit = (_QRcode_encodeString8bit)encoder.resolve("QRcode_encodeString8bit");
    QRcode_free = (_QRcode_free)encoder.resolve("QRcode_free");
}

QBitmap QrEncoder::encode(const QString &string)
{
    if (!QRcode_encodeString8bit) {
        return QBitmap();
    }
    QRcode *code;
    code = QRcode_encodeString8bit(string.toUtf8().data(), 0, 0);
    QBitmap result(code->width, code->width);
    result.fill();
    /* convert to QBitmap */
    QPainter painter;
    painter.begin(&result);
    unsigned char *pointer = code->data;
    for (int x = 0; x < code->width; x++) {
        for (int y = 0; y < code->width; y++) {
            if ((*pointer++ & 0x1) == 1) {
                painter.drawPoint(x, y);
            }
        }
    }
    painter.end();
    QRcode_free(code);
    return result;
}