/**
 * UGENE - Integrated Bioinformatics Tools.
 * Copyright (C) 2008-2023 UniPro <ugene@unipro.ru>
 * http://ugene.net
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#pragma once

#include <QAbstractItemModel>

#include <U2Core/Folder.h>
#include <U2Core/ProjectTreeControllerModeSettings.h>

#include "DocumentFolders.h"

namespace U2 {

class Document;
class GObject;
class Project;

class U2GUI_EXPORT ProjectViewModel : public QAbstractItemModel {
    Q_OBJECT
public:
    enum Type {
        DOCUMENT,
        FOLDER,
        OBJECT
    };

    ProjectViewModel(const ProjectTreeControllerModeSettings& settings, QObject* parent);

    void updateSettings(const ProjectTreeControllerModeSettings& settings);
    void updateData(const QModelIndex& index);

    // QAbstractItemModel
    int columnCount(const QModelIndex& parent) const;
    QVariant data(const QModelIndex& index, int role) const;
    QModelIndex index(int row, int column, const QModelIndex& parent) const;
    QModelIndex parent(const QModelIndex& index) const;
    int rowCount(const QModelIndex& parent) const;
    Qt::ItemFlags flags(const QModelIndex& index) const;
    QMimeData* mimeData(const QModelIndexList& indexes) const;
    QStringList mimeTypes() const;
    bool dropMimeData(const QMimeData* data, Qt::DropAction action, int row, int column, const QModelIndex& parent);
    Qt::DropActions supportedDropActions() const;
    bool setData(const QModelIndex& index, const QVariant& value, int role);

    void addDocument(Document* doc);
    void removeDocument(Document* doc);
    bool hasDocument(Document* doc) const;
    bool hasObject(Document* doc, GObject* obj) const;

    void moveObject(Document* doc, GObject* obj, const QString& newFolder);
    QList<GObject*> getFolderObjects(Document* doc, const QString& path) const;
    QList<Folder*> getSubfolders(Document* doc, const QString& path) const;
    void removeFolder(Document* doc, const QString& path);

    QString getObjectFolder(Document* doc, GObject* obj) const;

    void createFolder(Document* doc, QString& path);
    bool renameFolder(Document* doc, const QString& oldPath, const QString& newPath);

    QModelIndex getIndexForDoc(Document* doc) const;
    QModelIndex getIndexForPath(Document* doc, const QString& path) const;
    QModelIndex getIndexForObject(GObject* obj) const;

    static Type itemType(const QModelIndex& index);
    static Document* toDocument(const QModelIndex& index);
    static Folder* toFolder(const QModelIndex& index);
    static GObject* toObject(const QModelIndex& index);

    void addToIgnoreObjFilter(Document* doc, const U2DataId& objId);
    void addToIgnoreFolderFilter(Document* doc, const QString& folderPath);

    void excludeFromObjIgnoreFilter(Document* doc, const QSet<U2DataId>& ids);
    void excludeFromFolderIgnoreFilter(Document* doc, const QSet<QString>& paths);

signals:
    void si_modelChanged();
    void si_documentContentChanged(Document* doc);
    void si_projectItemRenamed(const QModelIndex& index);

private slots:
    void sl_objectAdded(GObject* obj);
    void sl_objectRemoved(GObject* obj);

    void sl_documentModifiedStateChanged();
    void sl_documentLoadedStateChanged();
    void sl_lockedStateChanged();
    void sl_documentURLorNameChanged();
    void sl_objectModifiedStateChanged();
    void sl_objectImported();
    void sl_documentImported();

private:
    static QObject* toQObject(const QModelIndex& index);
    static bool isActive(Document* doc);
    static bool isActive(GObject* obj);
    static QIcon getIcon(const QIcon& icon, bool enabled);
    static bool isWritableDoc(const Document* doc);
    static bool isDropEnabled(const Document* doc);
    static bool isAcceptableFolder(Document* targetDoc, const QString& targetFolderPath, const Folder& folder);
    /** NOTE: the method supposes that @oldFolders and @newFolders are sorted */
    static void findFoldersDiff(QStringList oldFolders, QStringList newFolders, QStringList& added, QStringList& deleted);

    Document* getObjectDocument(GObject* obj) const;

    int getTopLevelItemsCount() const;
    QModelIndex getTopLevelItemIndex(int row, int column) const;
    int getChildrenCount(Document* doc, const QString& path) const;
    int docRow(Document* doc) const;
    int folderRow(Folder* folder) const;
    int objectRow(GObject* obj) const;
    QVariant data(Document* doc, int role) const;
    QVariant data(Folder* folder, int role) const;
    QVariant data(GObject* obj, int role) const;

    Document* findDocument(const U2DbiRef& dbiRef) const;

    QVariant getDocumentTextColorData(Document* doc) const;
    QVariant getDocumentFontData(Document* doc) const;
    QVariant getDocumentDisplayData(Document* doc) const;
    QVariant getDocumentDecorationData(Document* doc) const;
    QVariant getDocumentToolTipData(Document* doc) const;

    QVariant getFolderDecorationData() const;

    QVariant getObjectDisplayData(GObject* obj, Document* parentDoc) const;
    QVariant getObjectFontData(GObject* obj, bool itemIsEnabled) const;
    QVariant getObjectToolTipData(GObject* obj, Document* parentDoc) const;
    QVariant getObjectDecorationData(GObject* obj, bool itemIsEnabled) const;
    QVariant getObjectTextColorData(GObject* obj) const;

    QModelIndex setFolderData(Folder* folder, const QString& newName);
    QModelIndex setObjectData(GObject* obj, const QString& newName);

    void insertFolder(Document* doc, const QString& path);

    void insertObject(Document* doc, GObject* obj, const QString& path);
    void removeObject(Document* doc, GObject* obj);
    void moveObjectsBetweenFolderTrees(Document* doc, const QStringList& srcTree, const QStringList& dstTree);

    void connectDocument(Document* doc);
    void disconnectDocument(Document* doc);
    void connectGObject(GObject* obj);

    Folder getDropFolder(const QModelIndex& index) const;
    void dropObject(GObject* obj, Document* targetDoc, const QString& targetFolderPath);
    void dropFolder(const Folder& folder, Document* targetDoc, const QString& targetFolderPath);
    void dropDocument(Document* doc, Document* targetDoc, const QString& targetFolderPath);

    bool renameFolderInDb(Document* doc, const QString& oldPath, QString& newPath) const;
    bool isFolderVisible(Document* doc) const;

    int beforeInsertDocument(Document* doc);
    int beforeInsertPath(Document* doc, const QString& path);
    int beforeInsertObject(Document* doc, GObject* obj, const QString& path);
    void afterInsert(int newRow);

    int beforeRemoveDocument(Document* doc);
    int beforeRemovePath(Document* doc, const QString& path);
    int beforeRemoveObject(Document* doc, GObject* obj);
    void afterRemove(int row);

    QList<Document*> docs;
    QSet<Document*> justAddedDocs;  // documents that have been added to a project but not loaded yet
    mutable QHash<Document*, DocumentFolders*> folders;
    ProjectTreeControllerModeSettings settings;

    static const QString MODIFIED_ITEM_COLOR;
};

}  // namespace U2
