#include "utils_internal.h"

#include <QFile>
#include <QDir>
#include <QTextStream>
#include <QSettings>
#include <QDebug>
#include <QCryptographicHash>
#include <QFileInfoList>

namespace internal {

int read1stLineOfFile(QString fileName) {
    QFile f(fileName);
    if (f.exists()) {
        if (f.open(QIODevice::ReadOnly | QIODevice::Text)) {
            QTextStream in(&f);
            in.setCodec("UTF-8");
            while(!in.atEnd()) {
                return in.readLine().toInt();
            }
        }
    }
    return -1;
}

QString customerRepoRoot() {
    return "/opt/app/tools/atbupdate/";
}

QString customerRepoDirName() {
    int const customerNr = read1stLineOfFile("/mnt/system_data/cust_nr");
    return (customerNr != -1) ? QString("customer_%1").arg(customerNr) : "";
}

QString customerRepoDir() {
    QString const &n = customerRepoDirName();
    QString const &r = customerRepoRoot();
    return !n.isEmpty() ? QDir::cleanPath(r + QDir::separator() + n) : "";
}

QString customerRepoDcDir() {
    QString const &r = customerRepoDir();
    return QDir::cleanPath(r + QDir::separator() + "etc/dc/");
}

bool customerRepoExists() {
    QString const repoDir{customerRepoDir()};
    return !repoDir.isEmpty() ? QDir(repoDir).exists() : false;
}

QString repositoryUrl() {
    return "gitea@ptu-config.atb-comm.de:ATB/";
}

QString branchName() {
    int const zoneNr = read1stLineOfFile("/mnt/system_data/zone_nr");
    if (zoneNr != -1) {
        return QString("zg1/zone%1").arg(zoneNr);
    }
    return "";
}

std::unique_ptr<QSettings> readSettings(QString const &optionalDirName) {
    std::unique_ptr<QSettings> settings{std::make_unique<QSettings>()};

    QString const fileName{settings->applicationName() + ".ini"};
    QDir d;

    if (!optionalDirName.isEmpty()) {
        d = QDir{optionalDirName};
        if (d.exists()) { // try to find ini-file under optionalDirname
            QFileInfo fi{d, optionalDirName};
            if (fi.exists()) {
                settings.reset(new QSettings(fi.absoluteFilePath(), QSettings::IniFormat));
                return settings;
            } else {
                qCritical() << fi.absoluteFilePath() << "not found."
                            << "Try" << internal::DEFAULT_INI_DIR;
            }
        } else {
            qCritical() << optionalDirName << "not found."
                        << "Try" << internal::DEFAULT_INSTALL_DIR;
        }
    }
    d = internal::DEFAULT_INI_DIR;
    if (d.exists()) { // try to find ini-file under /etc/tools/atbupdate
        QFileInfo fi{d, fileName};
        if (fi.exists()) {
            settings.reset(new QSettings(fi.absoluteFilePath(), QSettings::IniFormat));
            return settings;
        } else {
            qCritical() << fi.absoluteFilePath() << "not found."
                        << "Try" << internal::DEFAULT_INSTALL_DIR;
        }
    } else {
        qCritical() << internal::DEFAULT_INI_DIR << "not found."
                    << "Try" << internal::DEFAULT_INSTALL_DIR;
    }
    d = QDir{internal::DEFAULT_INSTALL_DIR};
    if (d.exists()) { // try to find ini-file under /opt/app/tools/atbupdate
        QFileInfo fi{d, fileName};
        if (fi.exists()) {
            settings.reset(new QSettings(fi.absoluteFilePath(), QSettings::IniFormat));
            return settings;
        } else {
            qCritical() << fi.absoluteFilePath() << "not found.";
        }
    } else {
        qCritical() << internal::DEFAULT_INSTALL_DIR << "not found.";
    }

    return settings;
}

std::unique_ptr<QString> dcCandidateToInstall(QString const &dcDirectory) {
    std::unique_ptr<QString> dcCandidate{nullptr};

    QDir dcDir{dcDirectory.isEmpty() ? customerRepoDcDir() : dcDirectory};
    if (dcDir.exists()) {

        QFileInfoList fileInfoList =
            dcDir.entryInfoList(QStringList("*.bin"),
                                QDir::Files | QDir::NoDotAndDotDot | QDir::NoSymLinks);

        QFileInfo dc2cbin{dcDir.absoluteFilePath("dc2c.bin")};


        if (dc2cbin.exists()) {

            QCryptographicHash md5gen(QCryptographicHash::Md5);
            QByteArray ba_dc2cbin{};
            {
                QFile f{dc2cbin.absoluteFilePath()};
                if (f.open(QIODevice::ReadOnly)) {
                    md5gen.addData(f.readAll());
                    ba_dc2cbin = md5gen.result();
                    md5gen.reset();
                }
            }

            if (ba_dc2cbin.size() > 0) {
                QFileInfoList::const_iterator it;
                for (it = fileInfoList.cbegin(); it != fileInfoList.cend(); ++it) {
                    if (it->absoluteFilePath() != dc2cbin.absoluteFilePath()) {
                        QFile f{it->absoluteFilePath()};
                        if (f.open(QIODevice::ReadOnly)) {
                            md5gen.addData(f.readAll());
                            if (ba_dc2cbin == md5gen.result()) {
                                dcCandidate.reset(new QString(f.fileName()));
                                break;
                            }
                            md5gen.reset();
                        }
                    }
                }
            }
        }
    }

    return dcCandidate;
}

} // namespace internal