/*
    SPDX-FileCopyrightText: 2009 Grégory Oestreicher <greg@kamago.net>

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

#pragma once

#include <memory>

#include "settings.h"
#include <Akonadi/AccountBase>
#include <Akonadi/FreeBusyProviderBase>
#include <Akonadi/ResourceBase>

class DavItemCache;
class DavFreeBusyHandler;

#include <QSet>

#include <QDBusObjectPath>

namespace KDAV
{
class DavItem;
}

class DavGroupwareResource : public Akonadi::ResourceBase,
                             public Akonadi::AgentBase::Observer,
                             public Akonadi::FreeBusyProviderBase,
                             public Akonadi::AgentBase::TagObserver,
                             public Akonadi::AccountBase
{
    Q_OBJECT

public:
    explicit DavGroupwareResource(const QString &id);
    ~DavGroupwareResource() override;

    void collectionAdded(const Akonadi::Collection &collection, const Akonadi::Collection &parent) override;
    void collectionRemoved(const Akonadi::Collection &collection) override;
    void cleanup() override;

    QDateTime lastCacheUpdate() const override;
    void canHandleFreeBusy(const QString &email) const override;
    void retrieveFreeBusy(const QString &email, const QDateTime &start, const QDateTime &end) override;

    void initAccount() override;

    Settings *settings() const;

private Q_SLOTS:
    void createInitialCache();
    void initialRetrieveCollections();
    void onCreateInitialCacheReady(KJob *);

protected:
    using ResourceBase::retrieveItems; // Suppress -Woverload-virtual

protected Q_SLOTS:
    void retrieveCollections() override;
    void retrieveItems(const Akonadi::Collection &collection) override;
    bool retrieveItem(const Akonadi::Item &item, const QSet<QByteArray> &parts) override;

protected:
    void itemAdded(const Akonadi::Item &item, const Akonadi::Collection &collection) override;
    void itemChanged(const Akonadi::Item &item, const QSet<QByteArray> &parts) override;
    void itemRemoved(const Akonadi::Item &item) override;
    void itemsTagsChanged(const Akonadi::Item::List &items, const QSet<Akonadi::Tag> &addedTags, const QSet<Akonadi::Tag> &removedTags) override;
    void collectionChanged(const Akonadi::Collection &collection) override;
    void doSetOnline(bool online) override;

private:
    enum ItemFetchUpdateType {
        ItemUpdateNone,
        ItemUpdateAdd,
        ItemUpdateChange,
        ItemUpdateCreated,
    };

    KJob *createRetrieveCollectionsJob();
    void onReloadConfig();
    void onCollectionAddedFinished(KJob *job);
    void onCollectionRemovedFinished(KJob *);
    void onCollectionChangedFinished(KJob *job, const Akonadi::Collection &collection);

    void onHandlesFreeBusy(const QString &email, bool handles);
    void onFreeBusyRetrieved(const QString &email, const QString &freeBusy, bool success, const QString &errorText);

    void onRetrieveCollectionsFinished(KJob *);
    void onRetrieveItemsFinished(KJob *);
    void onMultigetFinished(KJob *);
    void startMultigetChunks(const KDAV::DavUrl &davUrl,
                             const Akonadi::Collection &collection,
                             const QStringList &allRids,
                             const Akonadi::Item::List &allItems,
                             int offset,
                             const Akonadi::Item::List &accumulated);
    void onRetrieveItemFinished(KJob *);

    /**
     * Called when a new item has been fetched from the backend.
     *
     * @param job The job that fetched the item
     * @param updateType The type of update that triggered this call. The task notification sent
     *        sent to Akonadi will depend on this flag.
     */
    void onItemFetched(KJob *job, ItemFetchUpdateType updateType);
    void onItemRefreshed(KJob *job);

    void onItemAddedPrepared(KJob *);
    void onItemAddedFinished(KJob *);
    void onItemChangePrepared(KJob *);
    void onItemChangedFinished(KJob *);
    void onItemRemovalPrepared(KJob *);
    void onItemRemovedFinished(KJob *);
    void onItemExceptionsDeleteFinished(KJob *job);

    void onCollectionDiscovered(KDAV::Protocol protocol, const QString &collectionUrl, const QString &configuredUrl);
    void onConflictModifyJobFinished(KJob *job);
    void onDeletedItemRecreated(KJob *job);

    void doItemAdd(const Akonadi::Item &item, const Akonadi::Collection &collection);
    void doItemChange(const Akonadi::Item &item, const Akonadi::Item::List &dependentItems = Akonadi::Item::List());
    void doItemRemoval(const Akonadi::Item &item);
    void handleConflict(const Akonadi::Item &localItem,
                        const Akonadi::Item::List &localDependentItems,
                        const KDAV::DavItem &remoteItem,
                        bool isLocalRemoval,
                        int responseCode);

    bool configurationIsValid();
    void retryAfterFailure(const QString &errorMessage);

    /**
     * Collections which only support one mime type have an icon indicating what they support.
     */
    static void setCollectionIcon(Akonadi::Collection &collection);
    QString iconForDavUrl(const KDAV::DavUrl &davUrl);

    Akonadi::Collection mDavCollectionRoot;
    QMap<QString, std::shared_ptr<DavItemCache>> mDavItemCache;
    QMap<QString, QString> mCTagCache;
    DavFreeBusyHandler *const mFreeBusyHandler;
    bool mSyncErrorNotified = false;
    mutable Settings *mSettings = nullptr;
};
