#ifndef __SP_DOCUMENT_H__
#define __SP_DOCUMENT_H__

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

#include <glib-object.h>
#include <gtk/gtksignal.h>
#include <sigc++/sigc++.h>
#include <sigc++/class_slot.h>

#include "libcroco/cr-cascade.h"
#include "libnr/nr-forward.h"

#include "gc-managed.h"
#include "gc-finalized.h"
#include "gc-anchored.h"
#include <glibmm/ustring.h>
#include "verbs.h"
#include <vector>

namespace Avoid {
class Router;
}

struct NRRect;
struct SPDesktop;
struct SPItem;
struct SPObject;
struct SPGroup;

namespace Inkscape {
    struct Application;
    class Selection; 
    class UndoStackObserver;
    class EventLog;
    namespace XML {
        class Document;
        class Node;
    }
}

class SPDocumentPrivate;

/// Typed SVG document implementation.
struct SPDocument : public Inkscape::GC::Managed<>,
                    public Inkscape::GC::Finalized,
		    public Inkscape::GC::Anchored
{
	typedef sigc::signal<void, SPObject *> IDChangedSignal;
	typedef sigc::signal<void> ResourcesChangedSignal;
	typedef sigc::signal<void, guint> ModifiedSignal;
	typedef sigc::signal<void, gchar const *> URISetSignal;
	typedef sigc::signal<void, double, double> ResizedSignal;
	typedef sigc::signal<void> ReconstructionStart;
	typedef sigc::signal<void> ReconstructionFinish;
  typedef sigc::signal<void> CommitSignal;

	SPDocument();
	~SPDocument();

	unsigned int keepalive : 1;
	unsigned int virgin    : 1; ///< Has the document never been touched?

	Inkscape::XML::Document *rdoc; ///< Our Inkscape::XML::Document
	Inkscape::XML::Node *rroot; ///< Root element of Inkscape::XML::Document
	SPObject *root;             ///< Our SPRoot
	CRCascade *style_cascade;

	gchar *uri; ///< URI string or NULL
	gchar *base;
	gchar *name;

	SPDocumentPrivate *priv;

	/// Last action key
	const gchar *actionkey;
	/// Handler ID
	guint modified_id;

	// Instance of the connector router
	Avoid::Router *router;

	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);

	void bindObjectToId(gchar const *id, SPObject *object);
	SPObject *getObjectById(gchar const *id);
	sigc::connection connectIdChanged(const gchar *id, IDChangedSignal::slot_type slot);

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

    Glib::ustring getLanguage();

	void queueForOrphanCollection(SPObject *object);
	void collectOrphans();

	void _emitModified();

	GSList *_collection_queue;

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

        bool _updateDocument();

	/// Are we currently in a transition between two "known good" states of the document?
	bool isSeeking() const;

private:
	SPDocument(SPDocument const &); // no copy
	void operator=(SPDocument const &); // no assign

public:
	sigc::connection connectReconstructionStart(ReconstructionStart::slot_type slot);
	sigc::connection connectReconstructionFinish (ReconstructionFinish::slot_type  slot);
	void emitReconstructionStart (void);
	void emitReconstructionFinish  (void);

	unsigned long serial() const;
        void reset_key (void *dummy);
        sigc::connection _selection_changed_connection;
        sigc::connection _desktop_activated_connection;

	void fitToRect(NR::Rect const &rect);
};

SPDocument *sp_document_new (const gchar *uri, unsigned int keepalive, bool make_new = false);
SPDocument *sp_document_new_from_mem (const gchar *buffer, gint length, unsigned int keepalive);

SPDocument *sp_document_ref (SPDocument *doc);
SPDocument *sp_document_unref (SPDocument *doc);


SPDocument *sp_document_create(Inkscape::XML::Document *rdoc, gchar const *uri, gchar const *base, gchar const *name, unsigned int keepalive);

/*
 * Access methods
 */

#define sp_document_repr_doc(d) (d->rdoc)
#define sp_document_repr_root(d) (d->rroot)
#define sp_document_root(d) (d->root)
#define SP_DOCUMENT_ROOT(d)  (d->root)

gdouble sp_document_width (SPDocument * document);
gdouble sp_document_height (SPDocument * document);

struct SPUnit;

void sp_document_set_width (SPDocument * document, gdouble width, const SPUnit *unit);
void sp_document_set_height (SPDocument * document, gdouble height, const SPUnit *unit);

#define SP_DOCUMENT_URI(d) (d->uri)
#define SP_DOCUMENT_NAME(d) (d->name)
#define SP_DOCUMENT_BASE(d) (d->base)

/*
 * Dictionary
 */

/*
 * Undo & redo
 */

void sp_document_set_undo_sensitive (SPDocument * document, bool sensitive);
bool sp_document_get_undo_sensitive (SPDocument const * document);

void sp_document_clear_undo (SPDocument * document);
void sp_document_clear_redo (SPDocument * document);

void sp_document_child_added (SPDocument *doc, SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref);
void sp_document_child_removed (SPDocument *doc, SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref);
void sp_document_attr_changed (SPDocument *doc, SPObject *object, const gchar *key, const gchar *oldval, const gchar *newval);
void sp_document_content_changed (SPDocument *doc, SPObject *object, const gchar *oldcontent, const gchar *newcontent);
void sp_document_order_changed (SPDocument *doc, SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *oldref, Inkscape::XML::Node *newref);

/* Object modification root handler */
void sp_document_request_modified (SPDocument *doc);
gint sp_document_ensure_up_to_date (SPDocument *doc);

/* Save all previous actions to stack, as one undo step */
void sp_document_done (SPDocument *document, unsigned int event_type, Glib::ustring event_description);
void sp_document_maybe_done (SPDocument *document, const gchar *keyconst, unsigned int event_type, Glib::ustring event_description);
void sp_document_reset_key (Inkscape::Application *inkscape, SPDesktop *desktop, GtkObject *base);

/* Cancel (and revert) current unsaved actions */
void sp_document_cancel (SPDocument *document);

/* Undo and redo */
gboolean sp_document_undo (SPDocument * document);
gboolean sp_document_redo (SPDocument * document);

/* Resource management */
gboolean sp_document_add_resource (SPDocument *document, const gchar *key, SPObject *object);
gboolean sp_document_remove_resource (SPDocument *document, const gchar *key, SPObject *object);
const GSList *sp_document_get_resource_list (SPDocument *document, const gchar *key);
sigc::connection sp_document_resources_changed_connect(SPDocument *document, const gchar *key, SPDocument::ResourcesChangedSignal::slot_type slot);


/*
 * 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 necesary 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 ;)]
 *
 */

/*
 * Misc
 */

GSList * sp_document_items_in_box(SPDocument *document, unsigned int dkey, NR::Rect const &box);
GSList * sp_document_partial_items_in_box(SPDocument *document, unsigned int dkey, NR::Rect const &box);
SPItem* sp_document_item_from_list_at_point_bottom (unsigned int dkey, SPGroup *group, const GSList *list, NR::Point const p, bool take_insensitive = false);
SPItem * sp_document_item_at_point (SPDocument *document, unsigned int key, NR::Point const p, gboolean into_groups, SPItem *upto = NULL);
GSList *sp_document_items_at_points(SPDocument *document, unsigned const key, std::vector<NR::Point> points);
SPItem *sp_document_group_at_point (SPDocument *document, unsigned int key,  NR::Point const p);

void sp_document_set_uri (SPDocument *document, const gchar *uri);
void sp_document_resized_signal_emit (SPDocument *doc, gdouble width, gdouble height);

unsigned int vacuum_document (SPDocument *document);

#endif