// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef SEEN_SP_DOCUMENT_H
#define SEEN_SP_DOCUMENT_H

/** \file
 * SPDocument: Typed SVG document implementation
 */
/* Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   MenTaLguY <mental@rydia.net>
 *   Jon A. Cruz <jon@joncruz.org>
 *   Abhishek Sharma
 *
 * Copyright (C) 2004-2005 MenTaLguY
 * Copyright (C) 1999-2002 Lauris Kaplinski
 * Copyright (C) 2000-2001 Ximian, Inc.
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */


#include <cstddef>
#include <deque>
#include <map>
#include <vector>

#include <boost/ptr_container/ptr_list.hpp>

#include <glibmm/ustring.h>
#include <sigc++/sigc++.h>

#include <2geom/affine.h>
#include <2geom/forward.h>

#include "3rdparty/libcroco/cr-cascade.h"

#include "document-undo.h"
#include "event.h"
#include "gc-anchored.h"
#include "gc-finalized.h"

#include "inkgc/gc-managed.h"

#include "composite-undo-stack-observer.h"
// XXX only for testing!
#include "console-output-undo-observer.h"

// This variable is introduced with 0.92.1
// with the introduction of automatic fix 
// for files detected to have been created 
// with previous versions to have a similar
// look in 0.92+.
extern bool sp_no_convert_text_baseline_spacing;



// This variable is introduced with 0.92.1
// with the introduction of automatic fix 
// for files detected to have been created 
// with previous versions to have a similar
// look in 0.92+.
extern bool sp_do_not_fix_pre_92;



namespace Avoid {
class Router;
}

class SPItem;
class SPObject;
class SPGroup;
class SPRoot;

namespace Inkscape {
    class Selection; 
    class UndoStackObserver;
    class EventLog;
    class ProfileManager;
    namespace XML {
        struct Document;
        class Node;
    }
    namespace Util {
        class Unit;
        class Quantity;
    }
}

class SPDefs;
class SP3DBox;
class Persp3D;
class Persp3DImpl;
class SPItemCtx;

namespace Proj {
    class TransfMat3x4;
}

/// Typed SVG document implementation.
class SPDocument : public Inkscape::GC::Managed<>,
                   public Inkscape::GC::Finalized,
                   public Inkscape::GC::Anchored
{

public:

    /************ Functions *****************/

    // Fundamental ------------------------
    SPDocument();
    ~SPDocument() override;
    SPDocument(SPDocument const &) = delete; // no copy
    void operator=(SPDocument const &) = delete; // no assign


    // Document creation ------------------
    static SPDocument *createDoc(Inkscape::XML::Document *rdoc, char const *uri,
            char const *base, char const *name, bool keepalive,
            SPDocument *parent);
    static SPDocument *createNewDoc(char const*uri, bool keepalive,
            bool make_new = false, SPDocument *parent=nullptr );
    static SPDocument *createNewDocFromMem(char const*buffer, int length, bool keepalive);
           SPDocument *createChildDoc(std::string const &uri);


    // Document status --------------------
    void setVirgin(bool Virgin) { virgin = Virgin; }
    bool getVirgin() { return virgin; }

    SPDocument *doRef();
    SPDocument *doUnref();

    bool isModifiedSinceSave() const { return modified_since_save; }
    bool isModifiedSinceAutoSave() const { return modified_since_autosave; }
    void setModifiedSinceSave(bool const modified = true);
    void setModifiedSinceAutoSaveFalse() { modified_since_autosave = false; };

    bool idle_handler();
    bool rerouting_handler();

    void requestModified();
    bool _updateDocument(); // Used by stand-alone sp_document_idle_handler
    int ensureUpToDate();

    bool addResource(char const *key, SPObject *object);
    bool removeResource(char const *key, SPObject *object);
    std::vector<SPObject *> const getResourceList(char const *key);

    void do_change_uri(char const *const filename, bool const rebase);
    void changeUriAndHrefs(char const *uri);
    void setXMLDialogSelectedObject(SPObject *activexmltree) { _activexmltree = activexmltree; }
    SPObject *getXMLDialogSelectedObject() { return _activexmltree; }

  private:
    void _importDefsNode(SPDocument *source, Inkscape::XML::Node *defs, Inkscape::XML::Node *target_defs);
    SPObject *_activexmltree;

  public:
    void importDefs(SPDocument *source);

    unsigned int vacuumDocument();

    /******** Getters and Setters **********/

    // Document structure -----------------
    Inkscape::ProfileManager* getProfileManager() const { return profileManager; }
    Avoid::Router* getRouter() const { return router; }

    
    /** Returns our SPRoot */
    SPRoot *getRoot() { return root; }
    SPRoot const *getRoot() const { return root; }

    /** Return the main defs object for the document. */
    SPDefs *getDefs();

    Inkscape::XML::Node *getReprRoot() { return rroot; }
    Inkscape::XML::Node *getReprNamedView();

    /** Our Inkscape::XML::Document. */
    Inkscape::XML::Document *getReprDoc() { return rdoc; }
    Inkscape::XML::Document const *getReprDoc() const { return rdoc; }


    std::vector<Glib::ustring> getLanguages() const;

    // Styling
    CRCascade    *getStyleCascade() { return style_cascade; }
    CRStyleSheet *getStyleSheet()   { return style_sheet; }
    void const setStyleSheet(CRStyleSheet* sheet) { style_sheet = sheet; }

    // File information --------------------

    /** A filename (not a URI yet), or NULL */
    void setDocumentUri(char const *document_uri);
    char const *getDocumentURI() const { return document_uri; }

    /** To be used for resolving relative hrefs. */
    void setDocumentBase( char const* document_base );
    char const *getDocumentBase() const { return document_base; };

    /** basename(uri) or other human-readable label for the document. */
    char const* getDocumentName() const { return document_name; }


    // Document geometry ------------------------
    Inkscape::Util::Unit const* getDisplayUnit() const;

    void setDocumentScale( const double scaleX, const double scaleY );
    void setDocumentScale( const double scale );
    Geom::Scale getDocumentScale() const;

    void setWidthAndHeight(const Inkscape::Util::Quantity &width, const Inkscape::Util::Quantity &height, bool changeSize=true);
    Geom::Point getDimensions() const;

    void setWidth(const Inkscape::Util::Quantity &width, bool changeSize=true);
    void setHeight(const Inkscape::Util::Quantity &height, bool changeSize=true);
    Inkscape::Util::Quantity getWidth() const;
    Inkscape::Util::Quantity getHeight() const;

    void setViewBox();
    void setViewBox(const Geom::Rect &viewBox);
    Geom::Rect getViewBox() const;

    Geom::OptRect preferredBounds() const;
    void fitToRect(Geom::Rect const &rect, bool with_margins = false);
    void setupViewport(SPItemCtx *ctx);


    // Find items -----------------------------
    void bindObjectToId(char const *id, SPObject *object);
    SPObject *getObjectById(Glib::ustring const &id) const;
    SPObject *getObjectById(char const *id) const;

    void bindObjectToRepr(Inkscape::XML::Node *repr, SPObject *object);
    SPObject *getObjectByRepr(Inkscape::XML::Node *repr) const;

    std::vector<SPObject *> getObjectsByClass(Glib::ustring const &klass) const;
    std::vector<SPObject *> getObjectsByElement(Glib::ustring const &element) const;
    std::vector<SPObject *> getObjectsBySelector(Glib::ustring const &selector) const;


    // Find items by geometry --------------------
    void build_flat_item_list(unsigned int dkey, SPGroup *group, gboolean into_groups) const;

    std::vector<SPItem*> getItemsInBox         (unsigned int dkey, Geom::Rect const &box, bool take_hidden = false, bool take_insensitive = false, bool take_groups = true, bool enter_groups = false) const;
    std::vector<SPItem*> getItemsPartiallyInBox(unsigned int dkey, Geom::Rect const &box, bool take_hidden = false, bool take_insensitive = false, bool take_groups = true, bool enter_groups = false) const;
    SPItem *getItemAtPoint(unsigned int key, Geom::Point const &p, bool into_groups, SPItem *upto = nullptr) const;
    std::vector<SPItem*> getItemsAtPoints(unsigned const key, std::vector<Geom::Point> points, bool all_layers = true, size_t limit = 0) const ;
    SPItem *getGroupAtPoint(unsigned int key,  Geom::Point const &p) const;

    /**
     * Returns the bottommost item from the list which is at the point, or NULL if none.
     */
    static SPItem *getItemFromListAtPointBottom(unsigned int dkey, SPGroup *group, const std::vector<SPItem*> &list, Geom::Point const &p, bool take_insensitive = false);


    // Box tool -------------------------------
    void setCurrentPersp3D(Persp3D * const persp);
    /*
     * getCurrentPersp3D returns current_persp3d (if non-NULL) or the first
     * perspective in the defs. If no perspective exists, returns NULL.
     */
    Persp3D * getCurrentPersp3D();

    void setCurrentPersp3DImpl(Persp3DImpl * const persp_impl) { current_persp3d_impl = persp_impl; }
    Persp3DImpl * getCurrentPersp3DImpl() { return current_persp3d_impl; }

    void getPerspectivesInDefs(std::vector<Persp3D*> &list) const;
    unsigned int numPerspectivesInDefs() const {
        std::vector<Persp3D*> list;
        getPerspectivesInDefs(list);
        return list.size();
    }


    // Document undo/redo ----------------------
    unsigned long serial() const { return _serial; }  // Returns document's unique number.
    bool isSeeking() const {return seeking;} // In a transition between two "good" states of document?
    void reset_key(void *dummy) { actionkey.clear(); }
    bool isSensitive() const { return sensitive; }


    // Garbage collecting ----------------------
    void queueForOrphanCollection(SPObject *object);
    void collectOrphans();


    /************* Data ***************/
private:

    // Document ------------------------------
    Inkscape::ProfileManager* profileManager;   // Color profile.
    Avoid::Router *router; // Instance of the connector router

    // Document status -----------------------
    int ref_count;  // Temp to check refcounting

    bool keepalive; ///< false if temporary document (e.g. to generate a PNG for display in a dialog).
    bool virgin ;   ///< Has the document never been touched?
    bool modified_since_save = false;
    bool modified_since_autosave = false;
    sigc::connection modified_connection;
    sigc::connection rerouting_connection;

    // Document structure --------------------
    Inkscape::XML::Document *rdoc; ///< Our Inkscape::XML::Document
    Inkscape::XML::Node *rroot; ///< Root element of Inkscape::XML::Document

    SPRoot *root;             ///< Our SPRoot

    // A list of svg documents being used or shown within this document
    boost::ptr_list<SPDocument> _child_documents;
    // Conversely this is a parent document because this is a child.
    SPDocument *_parent_document;

    // Styling
    CRCascade *style_cascade;
    CRStyleSheet *style_sheet;

    // File information ----------------------
    char *document_uri;   ///< A filename (not a URI yet), or NULL
    char *document_base;  ///< To be used for resolving relative hrefs.
    char *document_name;  ///< basename(uri) or other human-readable label for the document.

    // Find items ----------------------------
    std::map<std::string, SPObject *> iddef;
    std::map<Inkscape::XML::Node *, SPObject *> reprdef;

    // Find items by geometry --------------------
    mutable std::deque<SPItem*> _node_cache; // Used to speed up search.
    mutable bool _node_cache_valid;

    // Box tool ----------------------------
    Persp3D *current_persp3d; /**< Currently 'active' perspective (to which, e.g., newly created boxes are attached) */
    Persp3DImpl *current_persp3d_impl;

    // Document undo/redo ----------------------
    friend Inkscape::DocumentUndo;

    /* Undo/Redo state */
    bool sensitive; /* If we save actions to undo stack */
    Inkscape::XML::Event * partial; /* partial undo log when interrupted */
    int history_size;
    std::vector<Inkscape::Event *> undo; /* Undo stack of reprs */
    std::vector<Inkscape::Event *> redo; /* Redo stack of reprs */

    /* Undo listener */
    Inkscape::CompositeUndoStackObserver undoStackObservers;

    // XXX only for testing!
    Inkscape::ConsoleOutputUndoObserver console_output_undo_observer;

    bool seeking; // Related to undo/redo/unique id
    unsigned long _serial; // Unique document number (used by undo/redo).
    Glib::ustring actionkey; // Last action key, used to combine actions in undo.

    // Garbage collecting ----------------------

    std::vector<SPObject *> _collection_queue; ///< Orphans


    /*********** Signals **************/

    typedef sigc::signal<void, SPObject *> IDChangedSignal;
    typedef sigc::signal<void> ResourcesChangedSignal;
    typedef sigc::signal<void, unsigned> ModifiedSignal;
    typedef sigc::signal<void, char const *> URISetSignal;
    typedef sigc::signal<void, double, double> ResizedSignal;
    typedef sigc::signal<void> ReconstructionStart;
    typedef sigc::signal<void> ReconstructionFinish;
    typedef sigc::signal<void> CommitSignal;

    typedef std::map<GQuark, SPDocument::IDChangedSignal> IDChangedSignalMap;
    typedef std::map<GQuark, SPDocument::ResourcesChangedSignal> ResourcesChangedSignalMap;

    /** Dictionary of signals for id changes */
    IDChangedSignalMap id_changed_signals;

    SPDocument::ModifiedSignal modified_signal;
    SPDocument::URISetSignal uri_set_signal;
    SPDocument::ResizedSignal resized_signal;
    SPDocument::ReconstructionStart _reconstruction_start_signal;
    SPDocument::ReconstructionFinish  _reconstruction_finish_signal;
    SPDocument::CommitSignal commit_signal; // Used by friend Inkscape::DocumentUndo

    bool oldSignalsConnected;

    sigc::connection _selection_changed_connection;
    sigc::connection _desktop_activated_connection;
    sigc::connection selChangeConnection;
    sigc::connection desktopActivatedConnection;

    sigc::signal<void> destroySignal;

    mutable Geom::Affine _doc2dt;

public:
    /// Document to desktop coordinate transformation.
    const Geom::Affine &doc2dt() const;
    /// Desktop to document coordinate transformation.
    const Geom::Affine &dt2doc() const
    {
        // Note: doc2dt().inverse() happens to be identical to doc2dt()
        return doc2dt();
    }
    /// True if the desktop Y-axis points down, false if it points up.
    bool is_yaxisdown() const { return yaxisdir() > 0; }
    /// "1" if the desktop Y-axis points down, "-1" if it points up.
    double yaxisdir() const { return _doc2dt[3]; }

    void addUndoObserver(Inkscape::UndoStackObserver& observer);
    void removeUndoObserver(Inkscape::UndoStackObserver& observer);

    sigc::connection connectDestroy(sigc::signal<void>::slot_type slot);
    sigc::connection connectModified(ModifiedSignal::slot_type slot);
    sigc::connection connectURISet(URISetSignal::slot_type slot);
    sigc::connection connectResized(ResizedSignal::slot_type slot);
    sigc::connection connectCommit(CommitSignal::slot_type slot);
    sigc::connection connectIdChanged(const char *id, IDChangedSignal::slot_type slot);
    sigc::connection connectResourcesChanged(char const *key, SPDocument::ResourcesChangedSignal::slot_type slot);
    sigc::connection connectReconstructionStart(ReconstructionStart::slot_type slot);
    sigc::connection connectReconstructionFinish(ReconstructionFinish::slot_type slot);

    /* Resources */
    std::map<std::string, std::vector<SPObject *> > resources;
    ResourcesChangedSignalMap resources_changed_signals; // Used by Extension::Internal::Filter

    void _emitModified();  // Used by SPItem
    void emitReconstructionStart();
    void emitReconstructionFinish();
    void emitResizedSignal(double width, double height);
};

/*
 * Ideas: How to overcome style invalidation nightmare
 *
 * 1. There is reference request dictionary, that contains
 * objects (styles) needing certain id. Object::build checks
 * final id against it, and invokes necessary methods
 *
 * 2. Removing referenced object is simply prohibited -
 * needs analyse, how we can deal with situations, where
 * we simply want to ungroup etc. - probably we need
 * Repr::reparent method :( [Or was it ;)]
 *
 */

#endif // SEEN_SP_DOCUMENT_H

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :