TimeZoneManager.h

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/**--------------------------------------------------------------------------------------------
Copyright (c) 2019, NDEVR LLC
tyler.parke@ndevr.org
  __    __   ____     _____ __     __  _______
 |  \  |  | |  __ \  |  ___|\ \   / / |   __  \
 |   \ |  | | |  \ \ | |___  \ \ / /  |  |__)  |
 |  . \|  | | |__/ / | |___   \ V /   |   _   /
 |  |\    |_|_____/__|_____|___\_/____|  | \  \
 |__| \__________________________________|  \__\
 
Subject to the terms of the Enterprise+ Agreement, NDEVR hereby grants 
Licensee a limited, non-exclusive, non-transferable, royalty-free license 
(without the right to sublicense) to use the API solely for the purpose of 
Licensee's internal development efforts to develop applications for which 
the API was provided.
 
The above copyright notice and this permission notice shall be included in all 
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
 
Library: Widgets
File: TimeZoneManager
Included in API: True
Author(s): Tyler Parke
 *-----------------------------------------------------------------------------------------**/
#pragma once
#include <NDEVR/Time.h>
#include <NDEVR/String.h>
#include <NDEVR/UUID.h>
#include <QTimeZone>
namespace NDEVR
{
    struct TimeZone
    {
        String name;
        String comment;
        UUID id;
    };
    class TimeZoneManager
    {
 
        static TimeZone convert(const QTimeZone& zone)
        {
            TimeZone time_zone;
            time_zone.name = String(zone.id().toStdString());
            time_zone.comment = String(zone.comment());
            time_zone.id = UUID::CreateUUID(time_zone.name);
            return time_zone;
        }
        static QTimeZone convert(const TimeZone& zone)
        {
            QTimeZone time_zone = QTimeZone(zone.name.getAs<QString>().toLocal8Bit());
            return time_zone;
        }
        static QDateTime convert(const Time& time, const QTimeZone& zone)
        {
            QDateTime date_time;
            date_time.setTimeZone(zone);
            date_time.setTime_t(time.getMilliseconds());
            return date_time;
        }
 
        static Buffer<TimeZone> Zones()
        {
            auto ids = QTimeZone::availableTimeZoneIds();
            Buffer<TimeZone> zones;
            for (auto id : ids)
            {
                zones.add(convert(QTimeZone(id)));
            }
            return zones;
        }
        static TimeZone SystemTimeZone()
        {
            return convert(QTimeZone::systemTimeZone());
        }
        static TimeZoneManager& defaultManager()
        {
            static TimeZoneManager s_time_zone_manager;
            return s_time_zone_manager;
        }
    protected:
        TimeZone m_current_timezone;
        QTimeZone m_q_current_timezone;
    };
}