#ifndef SETTINGSBASE_HPP
#define SETTINGSBASE_HPP

#include <QTextStream>
#include <QString>
#include <QRegExp>
#include <QMap>

#include <QDebug>

template <class Map>
class SettingsBase
{

public:
    SettingsBase() {}
    ~SettingsBase() {}

    inline QString value(const QString &key, const QString &defaultValue = QString())
    {
        return mSettings.value(key).isEmpty() ? defaultValue : mSettings.value(key);
    }

    inline void setValue(const QString &key, const QString &value)
    {
        mSettings.insert(key, value);
    }

    Map getSettings() {return mSettings;}

    bool readFile(QTextStream &stream)
    {
        mCache.clear();

        QString sectionPrefix;
        QRegExp sectionRe("^\\[([^]]+)\\]");
        QRegExp keyRe("^([^=]+)\\s*=\\s*(.+)$");

        while (!stream.atEnd()) {
            QString line = stream.readLine().simplified();

            if (line.isEmpty() || line.startsWith("#"))
                continue;

            if (sectionRe.exactMatch(line)) {
                sectionPrefix = sectionRe.cap(1);
                sectionPrefix.append("/");
                continue;
            }

            if (keyRe.indexIn(line) != -1) {

                QString key = keyRe.cap(1).simplified();
                QString value = keyRe.cap(2).simplified();

                if (!sectionPrefix.isEmpty())
                    key.prepend(sectionPrefix);

                // QMap will replace the value if key exists, QMultiMap creates a new one
                mCache.insert(key, value);
            }
        }

        if (mSettings.isEmpty()) {
            mSettings = mCache; // This is the first time we read a file
            return true;
        }

        // Replace values from previous settings
        QMapIterator<QString, QString> i(mCache);
        while (i.hasNext()) {
            i.next();
            if (mSettings.contains(i.key()))
                mSettings.remove(i.key());
        }

        // Merge the changed keys with those which didn't
        mSettings.unite(mCache);
        qDebug() << mSettings;
        return true;
    }

private:
    Map mSettings;
    Map mCache;
};

#endif // SETTINGSBASE_HPP