kasts/src/datamanager.h

/**
 * SPDX-FileCopyrightText: 2021 Bart De Vries <bart@mogwai.be>
 *
 * SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */

#pragma once

#include "feed.h"
#include "entry.h"

class DataManager : public QObject
{
    Q_OBJECT

public:
    static DataManager &instance()
    {
        static DataManager _instance;
        return _instance;
    }

    Feed* getFeed(int const index) const;
    Feed* getFeed(QString const feedurl) const;
    Entry* getEntry(int const feed_index, int const entry_index) const;
    Entry* getEntry(const Feed* feed, int const entry_index) const;
    Q_INVOKABLE Entry* getEntry(const QString id) const;
    int feedCount() const;
    int entryCount(const int feed_index) const;
    int entryCount(const Feed* feed) const;
    int unreadEntryCount(const Feed* feed) const;
    int newEntryCount(const Feed* feed) const;
    Q_INVOKABLE void addFeed(const QString &url);
    Q_INVOKABLE void removeFeed(const Feed* feed);
    Q_INVOKABLE void removeFeed(const int &index);

    //Q_INVOKABLE void addEntry(const QString &url);  // TODO: implement these methods
    //Q_INVOKABLE void removeEntry(const QString &url);
    //Q_INVOKABLE void removeEntry(const Feed* feed, const int &index);

    Entry* getQueueEntry(int const &index) const;
    int queueCount() const;
    QStringList getQueue() const;
    Q_INVOKABLE bool entryInQueue(const Entry* entry);
    Q_INVOKABLE bool entryInQueue(const QString &feedurl, const QString &id) const;
    Q_INVOKABLE void addToQueue(const Entry* entry);
    Q_INVOKABLE void addToQueue(const QString &feedurl, const QString &id);
    Q_INVOKABLE void moveQueueItem(const int &from, const int &to);
    Q_INVOKABLE void removeQueueItem(const int &index);
    Q_INVOKABLE void removeQueueItem(const QString id);
    Q_INVOKABLE void removeQueueItem(Entry* entry);

    Q_INVOKABLE void importFeeds(const QString &path);
    Q_INVOKABLE void exportFeeds(const QString &path);

Q_SIGNALS:
    void feedAdded(const QString &url);
    void feedRemoved(const int &index);
    void entryAdded(const QString &feedurl, const QString &id);
    //void entryRemoved(const Feed*, const int &index); // TODO: implement this signal
    void feedEntriesUpdated(const QString &url);
    void queueEntryAdded(const int &index, const QString &id);
    void queueEntryRemoved(const int &index, const QString &id);
    void queueEntryMoved(const int &from, const int &to);

private:
    DataManager();
    void loadFeed(QString feedurl) const;
    void loadEntry(QString id) const;
    bool feedExists(const QString &url);
    void updateQueueListnrs() const;

    mutable QHash<QString, Feed*> m_feeds; // hash of pointers to all feeds in db, key = url (lazy loading)
    mutable QHash<QString, Entry*> m_entries; // hash of pointers to all entries in db, key = id (lazy loading)

    QStringList m_feedmap; // list of feedurls in the order that they should appear in feedlist
    QHash<QString, QStringList> m_entrymap; // list of entries (per feed; key = url) in the order that they should appear in entrylist
    QStringList m_queuemap; // list of entries/enclosures in the order that they should show up in queuelist
};