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

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

#ifndef RULEENGINE_H
#define RULEENGINE_H

#include "rule.h"
#include "stateevaluator.h"
#include "types/event.h"

#include "integrations/thingmanager.h"

#include <QObject>
#include <QList>
#include <QUuid>
#include <QSettings>

Q_DECLARE_LOGGING_CATEGORY(dcRuleEngine)
Q_DECLARE_LOGGING_CATEGORY(dcRuleEngineDebug)

class ThingManager;
class LogEngine;
class Logger;

namespace nymeaserver {

class TimeManager;

class RuleEngine : public QObject
{
    Q_OBJECT
public:
    enum RuleError {
        RuleErrorNoError,
        RuleErrorInvalidRuleId,
        RuleErrorRuleNotFound,
        RuleErrorThingNotFound,
        RuleErrorEventTypeNotFound,
        RuleErrorStateTypeNotFound,
        RuleErrorActionTypeNotFound,
        RuleErrorInvalidParameter,
        RuleErrorInvalidRuleFormat,
        RuleErrorMissingParameter,
        RuleErrorInvalidRuleActionParameter,
        RuleErrorInvalidStateEvaluatorValue,
        RuleErrorTypesNotMatching,
        RuleErrorNotExecutable,
        RuleErrorInvalidTimeDescriptor,
        RuleErrorInvalidRepeatingOption,
        RuleErrorInvalidCalendarItem,
        RuleErrorInvalidTimeEventItem,
        RuleErrorContainsEventBasesAction,
        RuleErrorNoExitActions,
        RuleErrorInterfaceNotFound
    };
    Q_ENUM(RuleError)

    explicit RuleEngine(ThingManager *thingManager, TimeManager *timeManager, LogEngine *logEngine, QObject *parent = nullptr);
    ~RuleEngine();

    RuleError addRule(const Rule &rule, bool fromEdit = false);
    RuleError editRule(const Rule &rule);

    QList<Rule> rules() const;
    QList<RuleId> ruleIds() const;

    RuleError removeRule(const RuleId &ruleId, bool fromEdit = false);

    RuleError enableRule(const RuleId &ruleId);
    RuleError disableRule(const RuleId &ruleId);

    RuleError executeActions(const RuleId &ruleId);
    RuleError executeExitActions(const RuleId &ruleId);

    Rule findRule(const RuleId &ruleId);
    QList<RuleId> findRules(const ThingId &thingId) const;
    QList<ThingId> thingsInRules() const;

    void removeThingFromRule(const RuleId &id, const ThingId &thingId);

signals:
    void ruleAdded(const Rule &rule);
    void ruleRemoved(const RuleId &ruleId);
    void ruleConfigurationChanged(const Rule &rule);
    void ruleActiveChanged(const Rule &rule);

private slots:
    void init();
    void onEventTriggered(const Event &event);
    void onDateTimeChanged(const QDateTime &dateTime);
    void onThingRemoved(const ThingId &thingId);

private:    
    QList<Rule> evaluateEvent(const Event &event);
    QList<Rule> evaluateTime(const QDateTime &dateTime);

    bool containsEvent(const Rule &rule, const Event &event, const ThingClassId &thingClassId);
    bool containsState(const StateEvaluator &stateEvaluator, const Event &stateChangeEvent);

    RuleError checkRuleAction(const RuleAction &ruleAction, const Rule &rule);
    RuleError checkRuleActionParam(const RuleActionParam &ruleActionParam, const ActionType &actionType, const Rule &rule);

    QMetaType::Type getActionParamType(const ActionTypeId &actionTypeId, const ParamTypeId &paramTypeId);
    QMetaType::Type getEventParamType(const EventTypeId &eventTypeId, const ParamTypeId &paramTypeId);

    void appendRule(const Rule &rule);
    void saveRule(const Rule &rule);
    void saveRuleActions(NymeaSettings *settings, const QList<RuleAction> &ruleActions);
    QList<RuleAction> loadRuleActions(NymeaSettings *settings);

    void executeRuleActions(const RuleId &ruleId, const QList<RuleAction> &ruleActions);


private:
    ThingManager *m_thingManager = nullptr;
    TimeManager *m_timeManager = nullptr;
    Logger *m_logger = nullptr;

    QList<RuleId> m_ruleIds; // Keeping a list of RuleIds to keep sorting order...
    QHash<RuleId, Rule> m_rules; // ...but use a Hash for faster finding
    QList<RuleId> m_activeRules;

    QDateTime m_lastEvaluationTime;

    QList<RuleId> m_executingRules;

};

}

Q_DECLARE_METATYPE(nymeaserver::RuleEngine::RuleError)


#endif // RULEENGINE_H