/*
   Copyright (C) 2013-2019 Montel Laurent <montel@kde.org>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This program 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
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "sendlaterutil.h"
#include "sendlaterutil_p.h"
#include "sendlaterinfo.h"
#include "sendlateragentsettings.h"
#include "libsendlater_debug.h"
#include <KConfigGroup>
#include <AkonadiCore/ServerManager>

#include <QDBusInterface>
#include <QStringList>

namespace {
QString serviceName()
{
    return Akonadi::ServerManager::agentServiceName(Akonadi::ServerManager::Agent,
                                                    QStringLiteral("akonadi_sendlater_agent"));
}

QString dbusPath()
{
    return QStringLiteral("/SendLaterAgent");
}
}

bool SendLater::SendLaterUtil::compareSendLaterInfo(SendLater::SendLaterInfo *left, SendLater::SendLaterInfo *right)
{
    if (left->dateTime() == right->dateTime()) {
        //Set no recursive first.
        if (left->isRecurrence()) {
            return false;
        }
    }
    return left->dateTime() < right->dateTime();
}

void SendLater::SendLaterUtil::changeRecurrentDate(SendLater::SendLaterInfo *info)
{
    if (info && info->isRecurrence()) {
        qCDebug(LIBSENDLATER_LOG) << "BEFORE SendLater::SendLaterUtil::changeRecurrentDate " << info->dateTime().toString();
        QDateTime newInfoDateTime = info->dateTime();
        newInfoDateTime = updateRecurence(info, newInfoDateTime);
        qCDebug(LIBSENDLATER_LOG) << " QDateTime::currentDateTime()" << QDateTime::currentDateTime().toString();
        while (newInfoDateTime <= QDateTime::currentDateTime()) {
            newInfoDateTime = updateRecurence(info, newInfoDateTime);
        }
        info->setDateTime(newInfoDateTime);
        qCDebug(LIBSENDLATER_LOG) << "AFTER SendLater::SendLaterUtil::changeRecurrentDate " << info->dateTime().toString() << " info" << info << "New date" << newInfoDateTime;
        writeSendLaterInfo(defaultConfig(), info, true);
    }
}

QDateTime SendLater::SendLaterUtil::updateRecurence(SendLater::SendLaterInfo *info, QDateTime dateTime)
{
    switch (info->recurrenceUnit()) {
    case SendLater::SendLaterInfo::Days:
        dateTime = dateTime.addDays(info->recurrenceEachValue());
        break;
    case SendLater::SendLaterInfo::Weeks:
        dateTime = dateTime.addDays(info->recurrenceEachValue() * 7);
        break;
    case SendLater::SendLaterInfo::Months:
        dateTime = dateTime.addMonths(info->recurrenceEachValue());
        break;
    case SendLater::SendLaterInfo::Years:
        dateTime = dateTime.addYears(info->recurrenceEachValue());
        break;
    }
    return dateTime;
}

KSharedConfig::Ptr SendLater::SendLaterUtil::defaultConfig()
{
    return KSharedConfig::openConfig(QStringLiteral("akonadi_sendlater_agentrc"), KConfig::SimpleConfig);
}

void SendLater::SendLaterUtil::writeSendLaterInfo(KSharedConfig::Ptr config, SendLater::SendLaterInfo *info, bool forceReload)
{
    if (!info || !info->isValid()) {
        return;
    }

    const QString groupName = SendLater::SendLaterUtil::sendLaterPattern().arg(info->itemId());
    // first, delete all filter groups:
    const QStringList filterGroups = config->groupList();
    for (const QString &group : filterGroups) {
        if (group == groupName) {
            config->deleteGroup(group);
        }
    }
    KConfigGroup group = config->group(groupName);
    info->writeConfig(group);
    config->sync();
    config->reparseConfiguration();
    qCDebug(LIBSENDLATER_LOG) << " reparse config";
    if (forceReload) {
        reload();
    }
}

bool SendLater::SendLaterUtil::sentLaterAgentWasRegistered()
{
    QDBusInterface interface(serviceName(), dbusPath());
    return interface.isValid();
}

void SendLater::SendLaterUtil::forceReparseConfiguration()
{
    SendLaterAgentSettings::self()->save();
    SendLaterAgentSettings::self()->config()->reparseConfiguration();
}

bool SendLater::SendLaterUtil::sentLaterAgentEnabled()
{
    return SendLaterAgentSettings::self()->enabled();
}

void SendLater::SendLaterUtil::reload()
{
    qCDebug(LIBSENDLATER_LOG) << " void SendLater::SendLaterUtil::reload()";

    QDBusInterface interface(serviceName(), dbusPath());
    if (interface.isValid()) {
        interface.call(QStringLiteral("reload"));
    } else {
        qCDebug(LIBSENDLATER_LOG) << " Can not reload list";
    }
}

QString SendLater::SendLaterUtil::sendLaterPattern()
{
    return QStringLiteral("SendLaterItem %1");
}
