// SPDX-License-Identifier: GPL-3.0-or-later

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* Copyright (C) 2013 - 2024, nymea GmbH
* Copyright (C) 2024 - 2025, chargebyte austria GmbH
*
* This file is part of nymea-experience-plugin-energy.
*
* nymea-experience-plugin-energy 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 3 of the License, or
* (at your option) any later version.
*
* nymea-experience-plugin-energy 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 nymea-experience-plugin-energy. If not, see <https://www.gnu.org/licenses/>.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef ENERGYMANAGERIMPL_H
#define ENERGYMANAGERIMPL_H

#include <QObject>
#include <QHash>
#include <QTimer>

#include <integrations/thingmanager.h>

#include "energymanager.h"

class EnergyLogger;

class EnergyManagerImpl : public EnergyManager
{
    Q_OBJECT
public:
    explicit EnergyManagerImpl(ThingManager *thingManager, QObject *parent = nullptr);

    Thing *rootMeter() const override;
    EnergyError setRootMeter(const ThingId &rootMeterId) override;

    double currentPowerConsumption() const override;
    double currentPowerProduction() const override;
    double currentPowerAcquisition() const override;
    double currentPowerStorage() const override;
    double totalConsumption() const override;
    double totalProduction() const override;
    double totalAcquisition() const override;
    double totalReturn() const override;

    EnergyLogs *logs() const override;

private:
    void watchThing(Thing *thing);
    void unwatchThing(const ThingId &thingId);

    void updatePowerBalance();
    void updateThingPower(Thing *thing);

private slots:
    void logDumpConsumers();

private:
    ThingManager *m_thingManager = nullptr;

    Thing *m_rootMeter = nullptr;

    QTimer m_balanceUpdateTimer;
    double m_currentPowerConsumption = 0;
    double m_currentPowerProduction = 0;
    double m_currentPowerAcquisition = 0;
    double m_currentPowerStorage = 0;
    double m_totalConsumption = 0;
    double m_totalProduction = 0;
    double m_totalAcquisition = 0;
    double m_totalReturn = 0;

    EnergyLogger *m_logger = nullptr;

    // Caching some values so we don't have to look them up on the DB all the time:
    // We use different caches for power balance and thing logs because they are calculated independently
    // and one must not update the others cache for the diffs to be correct

    // For things totals we need to cache 2 values:
    // The last thing state values we've processed
    QHash<Thing *, double> m_powerBalanceTotalEnergyConsumedCache;
    QHash<Thing *, double> m_powerBalanceTotalEnergyProducedCache;

    // - The last thing state value we've read and processed
    // - The last entry in our internal counters we've processed and logged
    // QHash<Thing *, Pair<thingStateValue, internalValue>>
    QHash<Thing *, QPair<double, double>> m_thingsTotalEnergyConsumedCache;
    QHash<Thing *, QPair<double, double>> m_thingsTotalEnergyProducedCache;
};

#endif // ENERGYMANAGERIMPL_H