/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: https://neueland.iserlohn-fortress.net/gitea/aqua/smolbote
 *
 * SPDX-License-Identifier: GPL-3.0
 */

#ifndef SMOLBOTE_CONFIGURATION_H
#define SMOLBOTE_CONFIGURATION_H

#include <QAction>
#include <QString>
#include <QStringList>
#include <QVariant>
#include <boost/program_options.hpp>
#include <optional>
#include <string>
#include <vector>

class Configuration : public QObject
{
    Q_OBJECT

public:
    explicit Configuration(int argc, char** argv, const std::string &path, QObject *parent = nullptr);
    ~Configuration() = default;

    bool exists(const char *path)
    {
        return vm.count(path) ? true : false;
    }

    template <typename T>
    std::optional<T> value(const char *path) const
    {
        // if setting doesn't exist, we crash
        // in debug builds, check if setting exists

        if(vm.count(path) == 0) {
#ifdef QT_DEBUG
            qWarning("value(%s) does not exist", path);
#endif
            return std::nullopt;
        }

        // path is guaranteed to exist, so using vm[path] is safe

        if constexpr(std::is_same_v<T, QStringList>) {
            QStringList r;
            for(const std::string &item : vm[path].as<std::vector<std::string>>()) {
                r.append(QString::fromStdString(item));
            }
            return std::optional<QStringList>(r);

        } else if constexpr(std::is_same_v<T, std::string> || std::is_same_v<T, QString>) {

            if(vm[path].value().type() == typeid(int)) {
                if constexpr(std::is_same_v<T, std::string>)
                    return std::optional<std::string>(std::to_string(vm[path].as<int>()));
                else if constexpr(std::is_same_v<T, QString>)
                    return std::optional<QString>(QString::number(vm[path].as<int>()));
            }

            if(vm[path].value().type() == typeid(bool)) {
                return std::optional<T>(vm[path].as<bool>() ? "true" : "false");
            }

            std::string r = vm[path].as<std::string>();

            // check if it's a path
            if(r.front() == '~') {
                r.replace(0, 1, m_homePath);
            }

            if constexpr(std::is_same_v<T, std::string>)
                    return std::optional<std::string>(r);
            else if constexpr(std::is_same_v<T, QString>)
                    return std::optional<QString>(QString::fromStdString(r));

        } else
            return std::optional<T>(vm[path].as<T>());
    }

    template <typename T>
    void setValue(const char *path, const T &value)
    {
        if(vm.count(path) == 0) {
            qWarning("value(%s) does not exist", path);
        }

        vm.at(path).value() = value;

        emit settingChanged(path, value);
    }

    void setShortcut(QAction *action, const char *name) const
    {
        Q_CHECK_PTR(action);

        const auto shortcutText = this->value<QString>(name);
        if(shortcutText) {
            const QString tooltip = action->toolTip();
            action->setShortcut(QKeySequence::fromString(shortcutText.value()));
            action->setToolTip(QString("%1 (%2)").arg(tooltip, shortcutText.value()));

            connect(this, &Configuration::settingChanged, action, [=](const std::string &path, const QString &value) {
                if(path == name) {
                    action->setShortcut(QKeySequence::fromString(value));
                    action->setToolTip(QString("%1 (%2)").arg(tooltip, value));
                }
            });
        }
    }

    QHash<QString, QString> section(const std::string &prefix) const;
    const boost::program_options::options_description& description() const
    {
        return configuration_desc;
    }

signals:
    void settingChanged(const std::string &path, const QString &value);

private:
    boost::program_options::options_description configuration_desc;
    boost::program_options::variables_map vm;

    const std::string m_homePath;
};

#endif // SMOLBOTE_CONFIGURATION_H