#include <utility>

/******************************************************************************
 * Copyright (C) 2018 Kitsune Ral <kitsune-ral@users.sf.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#pragma once

#include "event.h"
#include "eventcontent.h"
#include "converters.h"

namespace QMatrixClient
{
    constexpr const char* FavouriteTag = "m.favourite";
    constexpr const char* LowPriorityTag = "m.lowpriority";

    struct TagRecord
    {
        using order_type = Omittable<float>;

        order_type order;

        TagRecord (order_type order = none) : order(order) { }

        bool operator<(const TagRecord& other) const
        {
            // Per The Spec, rooms with no order should be after those with order
            return !order.omitted() &&
                        (other.order.omitted() || order.value() < other.order.value());
        }
    };

    template <> struct JsonObjectConverter<TagRecord>
    {
        static void fillFrom(const QJsonObject& jo, TagRecord& rec)
        {
            // Parse a float both from JSON double and JSON string because
            // libqmatrixclient previously used to use strings to store order.
            const auto orderJv = jo.value("order"_ls);
            if (orderJv.isDouble())
                rec.order = fromJson<float>(orderJv);
            if (orderJv.isString())
            {
                bool ok;
                rec.order = orderJv.toString().toFloat(&ok);
                if (!ok)
                    rec.order = none;
            }
        }
        static void dumpTo(QJsonObject& jo, const TagRecord& rec)
        {
            addParam<IfNotEmpty>(jo, QStringLiteral("order"), rec.order);
        }
    };

    using TagsMap = QHash<QString, TagRecord>;

#define DEFINE_SIMPLE_EVENT(_Name, _TypeId, _ContentType, _ContentKey) \
    class _Name : public Event \
    { \
        public: \
            using content_type = _ContentType; \
            DEFINE_EVENT_TYPEID(_TypeId, _Name) \
            explicit _Name(QJsonObject obj) \
                : Event(typeId(), std::move(obj)) \
            { } \
            explicit _Name(_ContentType content) \
                : Event(typeId(), matrixTypeId(), \
                        QJsonObject { { QStringLiteral(#_ContentKey), \
                                        toJson(std::move(content)) } }) \
            { } \
            auto _ContentKey() const \
            { return content<content_type>(#_ContentKey##_ls); } \
    }; \
    REGISTER_EVENT_TYPE(_Name) \
    // End of macro

    DEFINE_SIMPLE_EVENT(TagEvent, "m.tag", TagsMap, tags)
    DEFINE_SIMPLE_EVENT(ReadMarkerEvent, "m.fully_read", QString, event_id)
    DEFINE_SIMPLE_EVENT(IgnoredUsersEvent, "m.ignored_user_list",
                        QSet<QString>, ignored_users)

    DEFINE_EVENTTYPE_ALIAS(Tag, TagEvent)
    DEFINE_EVENTTYPE_ALIAS(ReadMarker, ReadMarkerEvent)
}