/*
    SPDX-FileCopyrightText: 2007-2009 Shawn Starr <shawn.starr@rogers.com>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#pragma once

#include <QHash>
#include <QNetworkInformation>
#include <QTimer>

#include <Plasma5Support/DataEngine>
#include <Plasma5Support/DataEngineConsumer>

#include "ions/ion.h"

/**
 * @author Shawn Starr
 * This class is DataEngine. It handles loading, unloading, updating any data the ions wish to send. It is a gateway for datasources (ions) to
 * communicate with the WeatherEngine.
 *
 * To search for a city:
 * ion|validate|name such as noaa|validate|washington it will return a | separated list of valid places
 *
 * To fetch the weather:
 * ion|weather|place name  where the place name is a name returned by the former validate
 * noaa|weather|Claxton Evans County Airport, GA
 *
 * Some ions may have a longer syntax, for instance wetter.com requires two extra params
 * for instance:
 *
 * wettercom|validate|turin may return a list with items on the form
 *    Turin, Piemont, IT|extra|IT0PI0397;Turin
 *
 * Thus the query for weather will be on the form:
 *
 * wettercom|weather|Turin, Piemont, IT|IT0PI0397;Turin
 *
 * with the extra strings appended after extra
 */

class WeatherEngine : public Plasma5Support::DataEngine, public Plasma5Support::DataEngineConsumer
{
    Q_OBJECT

public:
    /** Constructor
     * @param parent The parent object.
     * @param args Argument list, unused.
     */
    WeatherEngine(QObject *parent);

    ~WeatherEngine() override;

protected: // Plasma5Support::DataEngine API
    /**
     * We use it to communicate to the Ion plugins to set the data sources.
     * @param source The datasource name.
     */
    bool sourceRequestEvent(const QString &source) override;

    /**
     * @param source The datasource to update.
     */
    bool updateSourceEvent(const QString &source) override;

protected Q_SLOTS: // expected DataEngine class method
    /**
     * Slot method with this signature expected in a DataEngine class.
     * @param source The datasource to be updated.
     * @param data The new data updated.
     */
    void dataUpdated(const QString &source, const Plasma5Support::DataEngine::Data &data);

private Q_SLOTS:
    void forceUpdate(IonInterface *ion, const QString &source);

    /**
     * Notify WeatherEngine a datasource is being removed.
     * @arg source datasource name.
     */
    void removeIonSource(const QString &source);

    /**
     * Whenever networking changes, take action
     */
    void onOnlineStateChanged(QNetworkInformation::Reachability reachability);
    void startReconnect();

    /**
     * updates the list of ions whenever KSycoca changes (as well as on init
     */
    void updateIonList();

private:
    /**
     * Get instance of a loaded ion.
     * @returns a IonInterface instance of a loaded plugin.
     */
    IonInterface *ionForSource(const QString &source, QString *ionName = nullptr);

private:
    QHash<QString, int> m_ionUsage;
    QTimer m_reconnectTimer;
};