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+/***************************************************************************
+                               undoredo.h
+                             -------------------
+ 
+    copyright            : (C) 2003, 2004 - Nicolas Deschildre
+    email                : ndeschildre@kdewebdev.org
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef UNDOREDO_H
+#define UNDOREDO_H
+
+#include <qvaluelist.h>
+#include <qptrlist.h>
+#include <qobject.h>
+#include "node.h"
+
+class Document;
+class NodeSelection;
+class NodeSelectionInd;
+
+/**
+ * The basic unit of the undo/redo system : a Node modification.
+ */
+class NodeModif
+{
+public:
+  NodeModif();
+  ~NodeModif();
+
+  /**
+   * For all NodeModifs : Type of the Node modification : Added, removed, modified, moved,...
+   * cf the NodeModification enumeration.
+   * WARNING The type MUST be set first!!
+   * @param type The type of the NodeModif, as described in the NodeModification enumeration.
+   */
+  void setType(int type){m_type = type;}
+
+  /**
+   * @return Returns the current type of the NodeModif.
+   */
+  int type() {return m_type;}
+
+  /**
+   * For all type : Location of the Node added/modified/removed/moved.
+   * @param location The location of the Node, cf kafkaCommon::getNodeLocation()
+   */
+  void setLocation(QValueList<int> location) {m_location = location;}
+
+  /**
+   * @return Returns the location of the Node which have been modified.
+   */
+  QValueList<int>& location() {return m_location;}
+
+  /**
+   * For Node move : Final location of the Node moved.
+   * @param location The final location of the Node moved, cf kafkaCommon::getNodeLocation()
+   */
+  void setFinalLocation(QValueList<int> location) {m_finalLocation = location;}
+
+  /**
+   * @return Returns the final location of the Node which was moved.
+   */
+  QValueList<int>& finalLocation() {return m_finalLocation;}
+
+  /**
+   * For Node deletion: Store the deleted Node.
+   * @param node The deleted node.
+   */
+  void setNode(Node *node);
+
+  /**
+   * @return Returns the deleted Node.
+   */
+  Node *node() {return m_node;}
+
+  /**
+   * For Node modification : Store the old tag
+   * @param tag The original tag.
+   */
+  void setTag(Tag *tag);
+
+  /**
+   * @return Returns the original Tag.
+   */
+  Tag *tag() {return m_tag;}
+
+  /**
+          * TODO:REMOVE
+   * For non-XmlEnd Node deletion without its children.
+   * @param childrenNumber The number of children which are moved up
+   * at the location where was the deleted Node.
+   */
+  void setChildrenMovedUp(int childrenNumber) {m_childrenMovedUp = childrenNumber;}
+
+  /**
+          * TODO:REMOVE
+   * @return Returns the number of childs which were moved up.
+   */
+  int childrenMovedUp() {return m_childrenMovedUp;}
+
+  /**
+          * TODO:REMOVE
+   * For XmlEnd Node deletion : number of  moved down
+   * @param number The number of right neighbours which are moved down.
+   */
+  void setNeighboursMovedDown(int number) {m_neighboursMovedDown = number;}
+
+  /**
+          * TODO:REMOVE
+   * @return Returns the number of right neighbours which were moved down.
+   */
+  int neighboursMovedDown() {return m_neighboursMovedDown;}
+
+  /** All the possible Node modifications */
+  enum NodeModification {
+    //A complete Node Tree is added. Implemented.
+    NodeTreeAdded = 0,
+    //A Node and its childs are added. Implemented.
+    NodeAndChildsAdded,
+    //A Node is added. Implemented.
+    NodeAdded,
+    //WARNING : do not use this if the node type or the node name change.
+    //A Node is modified. Implemented.
+    NodeModified,
+    //A Node is removed. Implemented.
+    NodeRemoved,
+    //A Node and its childs are removed. Implemented.
+    NodeAndChildsRemoved,
+    //The complete Node tree is removed. Implemented.
+    NodeTreeRemoved,
+    //Moving a Node from one location to another. Implemented.
+    NodeMoved,
+    //Moving a Node and its children from one location to another.
+    NodeAndChildsMoved
+  };
+
+private:
+  int m_type;
+  QValueList<int> m_location, m_finalLocation;
+  Node *m_node;
+  Tag *m_tag;
+  int m_childrenMovedUp;
+  int m_neighboursMovedDown;
+};
+
+/**
+ * A NodeModifsSet contains all the Node modifications made by one user input, and the 
+ * cursor and selection location before and after the user input.
+ */
+class NodeModifsSet
+{
+public:
+  NodeModifsSet();
+  ~NodeModifsSet();
+
+  /**
+   * Add a new NodeModif to the list of NodeModifs.
+   */
+  void addNodeModif(NodeModif *nodeModif) {m_nodeModifList.append(nodeModif);}
+
+  /**
+   * Returns the list of NodeModifs.
+   */
+  QPtrList<NodeModif> & nodeModifList() {return m_nodeModifList;}
+
+  /**
+   * Set the Modified flag BEFORE the user input.
+   */
+  void setIsModifiedBefore(bool isModifiedBefore) {m_isModifiedBefore = isModifiedBefore;}
+
+  /**
+   * @return Returns the Modified flag BEFORE the user input.
+   */
+  bool isModifiedBefore(){return m_isModifiedBefore;}
+
+  /**
+   * Set the Modified flag AFTER the user input.
+   */
+  void setIsModifiedAfter(bool isModifiedAfter) {m_isModifiedAfter = isModifiedAfter;}
+
+  /**
+   * @return Returns the Modified flag AFTER the user input.
+   */
+  bool isModifiedAfter(){return m_isModifiedAfter;}
+
+  /**
+   * Set a description to the user input.
+   */
+  void setDescription(const QString &description) {m_description = description;}
+
+  /**
+   * @return Returns the description of the user input.
+   */
+  QString description() {return m_description;}
+
+  /**
+   * Set the coordinates of the selection before the user input.
+   */
+  void setSelectionBefore(NodeSelectionInd* selectionBefore) {m_selectionBefore = selectionBefore;}
+    
+  /**
+   * @return Return the selection before the Node modifications.
+   */
+  NodeSelectionInd *selectionBefore() {return m_selectionBefore;}
+  
+  /**
+   * Set the coordinates of the selection after the user input.
+   */
+  void setSelectionAfter(NodeSelectionInd* selectionAfter) {m_selectionAfter = selectionAfter;}
+
+  /**
+   * @return Return the selection after the Node modifications.
+   */
+  NodeSelectionInd *selectionAfter() {return m_selectionAfter;}
+  
+  /**
+   * We can separate the NodeModif into two categories ; the Node modifs made by the user
+   * and then the indentation.
+   * Call this function when we have finished with the first category.
+   */
+  void startOfIndentation() {m_indentationStartOffset = m_nodeModifList.count();}
+  
+  /**
+   * @return Return the offset (starting from 0) where the indentation NodeModifs begin in the list of NodeModif.
+   * Return -1 if it hasn't begin to add the indentation NodeModifs.
+   */
+  int indentationStartOffset() {return m_indentationStartOffset;}
+  
+
+private:
+  QPtrList<NodeModif> m_nodeModifList;
+  bool m_isModifiedBefore, m_isModifiedAfter;
+  QString m_description;
+  NodeSelectionInd *m_selectionBefore, *m_selectionAfter;
+  int m_indentationStartOffset, m_type;
+};
+
+/**
+ * This class, basically a new undo/redo system, also helps KafkaDocument to synchronize the
+ * kafka and quanta view.
+ */
+class undoRedo : public QObject
+{
+public:
+  /**
+   * Creates a document specific undo/redo system.
+   * @param doc The Document the undo/redo system is linked to.
+   */
+  undoRedo(Document *doc);
+
+  ~undoRedo();
+
+  /** The enumeration of all possible location where modifications can occur */
+  enum modificationLocation {
+    // A modification was made in the source view (kate).
+    SourceModif = 0,
+    // A modification was made directly in the node Tree.
+    NodeTreeModif,
+    // A modification was made in the VPL view (kafka).
+    KafkaModif
+  };
+
+  /**
+   * Adds a new set of Node modification. This should be called whenever
+   * the kafka/quanta editor is modified.
+   * @param modifs The new modification set to add to the undo/redo stack.
+   * @param modifLocation Specifies where the modification was made
+   * @param selection If given, and if modifLocation == SourceModif, it will synchronize the cursor
+   * and the selection to 'selection'. Only work when the focus is in VPL for the moment.
+   * cf undoRedo::modificationLocation.
+   */
+  void addNewModifsSet(NodeModifsSet *modifs, int modifLocation, NodeSelection *selection = 0L, bool encodeText = true);
+
+  /**
+   * TEMPORARY function.
+   * First we will only enable undoRedo in VPL : this class will only log changes
+   * made in VPL.
+   * This function specify if we should log the changes submitted to addNewModifsSet or not.
+   * @param True => enable, false => disable
+   */
+  void turnOn(bool on);
+
+  /**
+   * TEMPORARY function.
+   * @return Returns true if the changes are logged.
+   */
+  bool turnedOn() {return m_loggingEnabled;}
+
+  /**
+          * TODO:REMOVE
+   * Ignores the ModifSet that will come in the number'th position. Useful when
+   * KTextEditor::EditInterface::insertText() is called before parser::rebuild() and
+   * thus parser::rebuild will be called two times.
+   * @param number Specifies the position of the ModifsSet to ignore.
+   */
+  void dontAddModifsSet(int number) {m_dontAddModifSet = number;}
+
+  /**
+          * TODO:REMOVE
+   * Merges the next ModifsSet with the previous one. Useful when autocompletion
+   * makes parser::rebuild() to be called again.
+   */
+  void mergeNextModifsSet() {m_mergeNext = true;}
+
+  /**
+   * Makes the undo operation.
+   * @param kafkaUndo Specifies if the undo operation is done in the kafka view.
+   * @return Returns true if a previous undo operation is available.
+   */
+  bool undo();
+
+  /**
+   * Makes the redo operation.
+   * @param kafkaUndo Specifies if the undo operation is done in the kafka view.
+   * @return Returns true if a next redo operation is available.
+   */
+  bool redo();
+
+  /**
+   * Synchronize the kafka view with the quanta view by applying the NodeModifs
+   * which have occured since the last synchronization.
+   * @return Returns if the synchronization was successful.
+   */
+  bool syncKafkaView();
+
+  /**
+   * Synchronize the quanta view with the kafka view by applying the NodeModifs
+   * which have occured since the last synchronization.
+   * @return Returns if the synchronization was successful.
+   */
+  bool syncQuantaView();
+
+  /**
+   * Synchronize the cursor position and the selection of the kafka view by translating
+   * the cursor position and selection of the quanta view.
+   * @param selection Synchronize the selection and the cursor position to "selection".
+   */
+  void syncKafkaCursorAndSelection(NodeSelection *selection);
+
+  /**
+   * Synchronize the cursor position and the selection of the quanta view by translating
+   * the cursor position and selection of the kafka view.
+   */
+  void syncQuantaCursorAndSelection();
+
+  /**
+  * Reload kafka from the current document.
+  * @param force If set to true, it will reload kafka even if it is already up to date.
+  * @param selection If given, it will synchronize the selection and the cursor position to 'selection'.
+  */
+  void reloadKafkaEditor(bool force = false, NodeSelection *selection = 0L);
+
+  /**
+   * Reload the quanta editor from kafka.
+   * @param force If set to true, it will reload quanta even if it is already up to date.
+   * @param syncQuantaCursor If set to true, it will try to sync the quanta cursor from
+   * the kafka one.
+   * @param encodeText Usually when a Text Node has the dirty flag (cleanStrBuilt), it means that
+   * it was modified in VPL and thus it contains some unencoded text : we have to encode it. (e.g.
+   * whitespace => &nbsp;) But some functions calling this function might not want that because
+   * the text is already encoded e.g. codeFormatting().
+   */
+  void reloadQuantaEditor(bool force = false, bool syncQuantaCursor = true, bool encodeText = true);
+
+  /**
+   * Format the code of the document. It simply call reloadQuantaEditor() after having
+   * set the dirty flag to every Node.
+   */
+  void codeFormatting();
+
+public slots:
+
+  /**
+   * Called by quantaApp whenever the current file is saved. The isModified
+   * flag of each NodeModisSet is updated.
+   */
+  void fileSaved();
+
+  /**
+   * Called when the kafkaPart is loaded.
+   */
+  void kafkaLoaded();
+
+private:
+
+  /**
+   * This is one of the main functions which apply the changes needed to undo a nodeModif
+   * in the text and in the Node tree.
+   * @param nodeModif The nodeModif to undo.
+   * @return Returns true if the undo has correctly worked.
+   */
+  bool undoNodeModif(NodeModif *nodeModif);
+
+  /**
+   * Convenient function which call undoNodeModif,
+   * while changing the type of the NodeModifs to make them redo.
+   */
+  bool redoNodeModif(NodeModif *nodeModif);
+
+  /**
+   * This is one of the main functions which apply the changes needed to undo a nodeModif
+   * in the kafka tree.
+   * @param _nodeModif The nodeModif to undo.
+   * @return Returns true if the undo has correctly worked.
+   */
+  bool undoNodeModifInKafka(NodeModif *nodeModif);
+
+  /**
+   * Convenient function which call undoNodeModifInKafka,
+   * while changing the type of the NodeModifs to make them redo.
+   */
+  bool redoNodeModifInKafka(NodeModif *nodeModif);
+
+  /**
+   * Prints in stdout a debugging flow.
+   */
+  void debugOutput();
+
+private:
+  /**
+   * The main undoRedo list which contains the NodeModifsSet.
+   */
+  QPtrList<NodeModifsSet> m_undoList;
+  /**
+   * The undoRedo list iterators which point the current location of each component in
+   * the undoRedo list.
+   * documentIterator point the current location of the Node Tree.
+   * sourceIterator point the current location of the source view (kate).
+   * kafkaIterator point the current location of the VPL view (kafka).
+   */
+  QPtrListIterator<NodeModifsSet> documentIterator;
+  QPtrListIterator<NodeModifsSet> sourceIterator;
+  QPtrListIterator<NodeModifsSet> kafkaIterator;
+  int m_listLimit;
+  bool m_merging;
+  bool addingText;
+  QValueList<int> m_currentLoc;
+  Document *m_doc;
+  bool m_mergeNext;
+  int m_dontAddModifSet;
+  bool m_loggingEnabled;
+};
+
+#endif