#ifndef CONFIGBASE
#define CONFIGBASE

#include <QString>
#include <QStringList>
#include <QList>
#include <QMap>

#include <exception>
#include <type_traits>
#include <limits>

using CRSMConfigException = std::logic_error;

namespace CRSMConfigValueType {
enum Type {
    None,
    String,
    Integer,
    Boolean,
    List,
    Map
};
}

class CRSMConfigValueBase {
public:

    virtual void setValue(const QString&) {  }
    virtual QString value() { return ""; }
    virtual CRSMConfigValueType::Type type() { return CRSMConfigValueType::Type::None; }



    template<typename Type>
    static Type getValue(const QString& value);

    template<typename Type>
    static QString getStringValue(Type val);
};

template<typename Type, typename = void>
class CRSMConfigValue : public CRSMConfigValueBase {
public:
//    CRSMConfigValue(Type&) {  }

    virtual void setValue(const QString&) { throw CRSMConfigException("Cannot assign"); }
    virtual QString value() { throw CRSMConfigException("Cannot get the value"); }
};

using String = QString;
using Integer = int;
using Port = ushort;
using Boolean = bool;
#define List(Type) QList<Type>
#define Map(KeyType, ValueType) QMap<KeyType, ValueType>


#define ConfigValue(Value) {#Value, mkConfigValue(Value)}
#define ConfigValueEx(Value, ...) {#Value, mkConfigValue(Value, __VA_ARGS__)}

template<>
class CRSMConfigValue<String> : public CRSMConfigValueBase {
    String& config;
    bool trimmedQuotes = false;

public:
    CRSMConfigValue(String& config) : config(config) {  }

    virtual void setValue(const QString& value) { config = trimQuotes(QString(value), trimmedQuotes); }
    virtual QString value()
    {
        if(trimmedQuotes)
        {
            return "\"" + config + "\"";
        }
        else
        {
            return config;
        }
    }
    virtual CRSMConfigValueType::Type type() { return CRSMConfigValueType::Type::String; }

private:
    QString& trimQuotes(QString&& string, bool& trimmed)
    {
        trimmed = false;
        if(string.length() >= 2 && string.at(0) == '"' && string.at(string.length() - 1) == '"')
        {
            string.remove(0, 1);
            string.remove(string.length() - 1, 1);
            trimmed = true;
        }
        return string;
    }

};

template<typename Type>
class CRSMConfigValue<Type, typename std::enable_if<std::is_integral<Type>::value>::type> : public CRSMConfigValueBase {
    Type& config;

public:
    CRSMConfigValue(Type& config) : config(config) {  }

    virtual void setValue(const QString& value)
    {
        bool ok = true;
        long long longLongVal = value.toLongLong(&ok, 0);
        if(!ok) throw CRSMConfigException("\"" + value.toStdString() + "\" could not be parsed as an Integer");
        if(longLongVal < std::numeric_limits<Type>::min() || longLongVal > std::numeric_limits<Type>::max()) throw CRSMConfigException((QString::number(longLongVal) + " is out of range (" + QString::number(std::numeric_limits<Type>::min()) + " - " + QString::number(std::numeric_limits<Type>::max()) + ")").toStdString());
        config = static_cast<Type>(longLongVal);
    }
    virtual QString value() { return QString::number(config); }
    virtual CRSMConfigValueType::Type type() { return CRSMConfigValueType::Type::Integer; }
};

template<>
class CRSMConfigValue<Boolean> : public CRSMConfigValueBase {
    Boolean& config;

public:
    CRSMConfigValue(Boolean& config) : config(config) {  }

    virtual void setValue(const QString& value)
    {
        if(value == "true")
        {
            config = true;
        }
        else if(value == "false")
        {
            config = false;
        }
        else
        {
            throw CRSMConfigException("\"" + value.toStdString() + "\" could not be parsed as a Boolean");
        }
    }
    virtual QString value() { return config ? "true" : "false"; }
    virtual CRSMConfigValueType::Type type() { return CRSMConfigValueType::Type::Boolean; }
};

class CRSMConfigValueList : public CRSMConfigValueBase {
public:
    virtual void append(const QString& entry) = 0;
    virtual void remove(const QString& entry) = 0;
    virtual QStringList getValues() = 0;
};

class CRSMConfigValueMap : public CRSMConfigValueBase {
public:
    virtual void setKeyValue(const QString& key, const QString& value) = 0;
    virtual void remove(const QString& key) = 0;
    virtual QMap<QString, QString> getValues() = 0;
};

template<typename Type>
class CRSMConfigValue<QList<Type>> : public CRSMConfigValueList {
    using ListType = QList<Type>;

    ListType& config;
    const bool deduplicate;

public:
    CRSMConfigValue(ListType& config, bool deduplicate = true) : config(config), deduplicate(deduplicate) {}

    virtual ListType& list() { return config; }
    virtual CRSMConfigValueType::Type type() { return CRSMConfigValueType::Type::List; }

    virtual void append(const QString &entry)
    {
        Type val = CRSMConfigValueBase::getValue<Type>(entry);
        if(!deduplicate || !config.contains(val))
        {
            config.append(val);
        }
    }

    virtual void remove(const QString &entry) { config.removeAll(CRSMConfigValueBase::getValue<Type>(entry)); }

    virtual QStringList getValues()
    {
        QStringList ret;

        foreach(Type val, config)
        {
            ret.append(CRSMConfigValueBase::getStringValue(val));
        }

        return ret;
    }
};

template<typename KeyType, typename ValueType>
class CRSMConfigValue<QMap<KeyType, ValueType>> : public CRSMConfigValueMap {
    using MapType = QMap<KeyType, ValueType>;

    MapType& config;

public:
    CRSMConfigValue(MapType& config) : config(config) {}

    virtual MapType& map() { return config; }
    virtual CRSMConfigValueType::Type type() { return CRSMConfigValueType::Type::Map; }

    virtual void setKeyValue(const QString& key, const QString& value)
    {
        config[CRSMConfigValueBase::getValue<KeyType>(key)] = CRSMConfigValueBase::getValue<ValueType>(value);
    }

    virtual QMap<QString, QString> getValues()
    {
        QMap<QString, QString> ret;

        foreach(KeyType key, config.keys())
        {
            ret[CRSMConfigValueBase::getStringValue(key)] = CRSMConfigValueBase::getStringValue(config[key]);
        }

        return ret;
    }

    virtual void remove(const QString &key)
    {
        config.remove(CRSMConfigValueBase::getValue<KeyType>(key));
    }
};

template<typename Type>
class CRSMConfigValue<Type, typename std::enable_if<std::is_enum<Type>::value>::type> : public CRSMConfigValue<typename std::underlying_type<Type>::type> {
    using UndType = typename std::underlying_type<Type>::type;
public:
    CRSMConfigValue(Type& config) : CRSMConfigValue<UndType>::CRSMConfigValue((UndType&)config) {}
};

template<typename Type, typename... Types>
CRSMConfigValue<Type>* mkConfigValue(Type& Value, Types... values)
{
    return new CRSMConfigValue<Type>(Value, values...);
}

template<typename Type>
Type CRSMConfigValueBase::getValue(const QString& value)
{
    Type ret;
    CRSMConfigValue<Type> val(ret);
    val.setValue(value);
    return ret;
}

template<typename Type>
QString CRSMConfigValueBase::getStringValue(Type value)
{
    CRSMConfigValue<Type> val(value);
    return val.value();
}

class CRSMConfigBase
{
public:
    explicit CRSMConfigBase(QMap<QString, CRSMConfigValueBase*> configValues) : configValues(configValues) {}

    void setConfigValue(const QString& name, const QString& value);
    QString getConfigValueLine(const QString& name);
    void addConfigListEntry(const QString& name, const QString& value);
    void removeConfigMapListEntry(const QString &name, const QString &value);
    void setConfigMapValue(const QString& name, const QString& key, const QString& value);

    QString read(const QString& fileName, bool writeDefault = true);
    bool write(const QString& fileName);

    void setConfigLine(const QString& line);

protected:
    void addConfigValue(QString name, CRSMConfigValueBase *value);
    CRSMConfigValueBase& getConfigValue(const QString &name);

    QMap<QString, CRSMConfigValueBase*> configValues;
};

#endif // CONFIGBASE