/****************************************************************************

** 

**

** Definition of QMap class

**

** Created : 990406

**

** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.

**

** This file is part of the tools module of the Qt GUI Toolkit.

**

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

**

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

**

** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition

** licenses may use this file in accordance with the Qt Commercial License

** Agreement provided with the Software.

**

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

**

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

**   information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing information.

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**********************************************************************/

#ifndef QMAP_H

#define QMAP_H

#ifndef QT_H

#include "qshared.h"

#include "qdatastream.h"

#endif // QT_H

struct QMapNodeBase

{

    enum Color { Red, Black };

    QMapNodeBase* left;

    QMapNodeBase* right;

    QMapNodeBase* parent;

    Color color;

    QMapNodeBase* minimum() {

	QMapNodeBase* x = this;

	while ( x->left )

	    x = x->left;

	return x;

    }

    QMapNodeBase* maximum() {

	QMapNodeBase* x = this;

	while ( x->right )

	    x = x->right;

	return x;

    }

};

template <class K, class T>

struct QMapNode : public QMapNodeBase

{

    QMapNode( const K& _key, const T& _data ) { data = _data; key = _key; }

    QMapNode( const K& _key )	   { key = _key; }

    QMapNode( const QMapNode<K,T>& _n ) { key = _n.key; data = _n.data; }

    QMapNode() { }

    T data;

    K key;

};

template<class K, class T>

class Q_EXPORT QMapIterator

{

 public:

    /**

     * Typedefs

     */

    typedef QMapNode< K, T >* NodePtr;

    /**

     * Variables

     */

    QMapNode<K,T>* node;

    /**

     * Functions

     */

    QMapIterator() : node( 0 ) {}

    QMapIterator( QMapNode<K,T>* p ) : node( p ) {}

    QMapIterator( const QMapIterator<K,T>& it ) : node( it.node ) {}

    bool operator==( const QMapIterator<K,T>& it ) const { return node == it.node; }

    bool operator!=( const QMapIterator<K,T>& it ) const { return node != it.node; }

    T& operator*() { return node->data; }

    const T& operator*() const { return node->data; }

    // Cannot have this - some compilers are too stupid

    //T* operator->() const { return &(node->data); }

    const K& key() const { return node->key; }

    T& data() { return node->data; }

    const T& data() const { return node->data; }

private:

    int inc() {

	QMapNodeBase* tmp = node;

	if ( tmp->right ) {

	    tmp = tmp->right;

	    while ( tmp->left )

		tmp = tmp->left;

	} else {

	    QMapNodeBase* y = tmp->parent;

	    while (tmp == y->right) {

		tmp = y;

		y = y->parent;

	    }

	    if (tmp->right != y)

		tmp = y;

	}

	node = (NodePtr)tmp;

	return 0;

    }

    int dec() {

	QMapNodeBase* tmp = node;

	if (tmp->color == QMapNodeBase::Red &&

	    tmp->parent->parent == tmp ) {

	    tmp = tmp->right;

	} else if (tmp->left != 0) {

	    QMapNodeBase* y = tmp->left;

	    while ( y->right )

		y = y->right;

	    tmp = y;

	} else {

	    QMapNodeBase* y = tmp->parent;

	    while (tmp == y->left) {

		tmp = y;

		y = y->parent;

	    }

	    tmp = y;

	}

	node = (NodePtr)tmp;

	return 0;

    }

public:

    QMapIterator<K,T>& operator++() {

	inc();

	return *this;

    }

    QMapIterator<K,T> operator++(int) {

	QMapIterator<K,T> tmp = *this;

	inc();

	return tmp;

    }

    QMapIterator<K,T>& operator--() {

	dec();

	return *this;

    }

    QMapIterator<K,T> operator--(int) {

	QMapIterator<K,T> tmp = *this;

	dec();

	return tmp;

    }

};

template<class K, class T>

class Q_EXPORT QMapConstIterator

{

 public:

    /**

     * Typedefs

     */

    typedef QMapNode< K, T >* NodePtr;

    /**

     * Variables

     */

    QMapNode<K,T>* node;

    /**

     * Functions

     */

    QMapConstIterator() : node( 0 ) {}

    QMapConstIterator( QMapNode<K,T>* p ) : node( p ) {}

    QMapConstIterator( const QMapConstIterator<K,T>& it ) : node( it.node ) {}

    QMapConstIterator( const QMapIterator<K,T>& it ) : node( it.node ) {}

    bool operator==( const QMapConstIterator<K,T>& it ) const { return node == it.node; }

    bool operator!=( const QMapConstIterator<K,T>& it ) const { return node != it.node; }

    const T& operator*()  const { return node->data; }

    // Cannot have this - some compilers are too stupid

    //const T* operator->() const { return &(node->data); }

    const K& key() const { return node->key; }

    const T& data() const { return node->data; }

private:

    int inc() {

        QMapNodeBase* tmp = node;

	if ( tmp->right ) {

	    tmp = tmp->right;

	    while ( tmp->left )

		tmp = tmp->left;

	} else {

	    QMapNodeBase* y = tmp->parent;

	    while (tmp == y->right) {

		tmp = y;

		y = y->parent;

	    }

	    if (tmp->right != y)

		tmp = y;

	}

	node = (NodePtr)tmp;

	return 0;

    }

    int dec() {

	QMapNodeBase* tmp = node;

	if (tmp->color == QMapNodeBase::Red &&

	    tmp->parent->parent == tmp ) {

	    tmp = tmp->right;

	} else if (tmp->left != 0) {

	    QMapNodeBase* y = tmp->left;

	    while ( y->right )

		y = y->right;

	    tmp = y;

	} else {

	    QMapNodeBase* y = tmp->parent;

	    while (tmp == y->left) {

		tmp = y;

		y = y->parent;

	    }

	    tmp = y;

	}

	node = (NodePtr)tmp;

	return 0;

    }

public:

    QMapConstIterator<K,T>& operator++() {

	inc();

	return *this;

    }

    QMapConstIterator<K,T> operator++(int) {

	QMapConstIterator<K,T> tmp = *this;

	inc();

	return tmp;

    }

    QMapConstIterator<K,T>& operator--() {

	dec();

	return *this;

    }

    QMapConstIterator<K,T> operator--(int) {

	QMapConstIterator<K,T> tmp = *this;

	dec();

	return tmp;

    }

};

class Q_EXPORT QMapPrivateBase : public QShared

{

public:

    QMapPrivateBase() {

	node_count = 0;

    }

    QMapPrivateBase( const QMapPrivateBase* _map) {

	node_count = _map->node_count;

    }

    /**

     * Implementations of basic tree algorithms

     */

    void rotateLeft( QMapNodeBase* x, QMapNodeBase*& root);

    void rotateRight( QMapNodeBase* x, QMapNodeBase*& root );

    void rebalance( QMapNodeBase* x, QMapNodeBase*& root );

    QMapNodeBase* removeAndRebalance( QMapNodeBase* z, QMapNodeBase*& root,

				      QMapNodeBase*& leftmost,

				      QMapNodeBase*& rightmost );

    /**

     * Variables

     */

    int node_count;

};

template <class Key, class T>

class QMapPrivate : public QMapPrivateBase

{

public:

    /**

     * Typedefs

     */

    typedef QMapIterator< Key, T > Iterator;

    typedef QMapConstIterator< Key, T > ConstIterator;

    typedef QMapNode< Key, T > Node;

    typedef QMapNode< Key, T >* NodePtr;

    /**

     * Functions

     */

    QMapPrivate() {

	header = new Node;

	header->color = QMapNodeBase::Red; // Mark the header

	header->parent = 0;

	header->left = header->right = header;

    }

    QMapPrivate( const QMapPrivate< Key, T >* _map ) : QMapPrivateBase( _map ) {

	header = new Node;

	header->color = QMapNodeBase::Red; // Mark the header

	if ( _map->header->parent == 0 ) {

	    header->parent = 0;

	    header->left = header->right = header;

	} else {

	    header->parent = copy( (NodePtr)(_map->header->parent) );

	    header->parent->parent = header;

	    header->left = header->parent->minimum();

	    header->right = header->parent->maximum();

	}

    }

    ~QMapPrivate() { clear(); delete header; }

    NodePtr copy( NodePtr p ) {

	if ( !p )

	    return 0;

	NodePtr n = new Node( *p );

	n->color = p->color;

	if ( p->left ) {

	    n->left = copy( (NodePtr)(p->left) );

	    n->left->parent = n;

	} else {

	    n->left = 0;

	}

	if ( p->right ) {

	    n->right = copy( (NodePtr)(p->right) );

	    n->right->parent = n;

	} else {

	    n->right = 0;

	}

	return n;

    }

    void clear() {

	clear( (NodePtr)(header->parent) );

	header->color = QMapNodeBase::Red;

	header->parent = 0;

	header->left = header->right = header;

	node_count = 0;

    }

    void clear( NodePtr p ) {

	while ( p != 0 ) {

	    clear( (NodePtr)p->right );

	    NodePtr y = (NodePtr)p->left;

	    delete p;

	    p = y;

	}

    }

    Iterator begin()	{ return Iterator( (NodePtr)(header->left ) ); }

    Iterator end()	{ return Iterator( header ); }

    ConstIterator begin() const { return ConstIterator( (NodePtr)(header->left ) ); }

    ConstIterator end() const { return ConstIterator( header ); }

    ConstIterator find(const Key& k) const {

	QMapNodeBase* y = header;        // Last node

	QMapNodeBase* x = header->parent; // Root node.

	while ( x != 0 ) {

	    // If as k <= key(x) go left

	    if ( !( key(x) < k ) ) {

		y = x;

		x = x->left;

	    } else {

		x = x->right;

	    }

	}

	// Was k bigger/smaller then the biggest/smallest

	// element of the tree ? Return end()

	if ( y == header || k < key(y) )

	    return ConstIterator( header );

	return ConstIterator( (NodePtr)y );

    }

    void remove( Iterator it ) {

	NodePtr del = (NodePtr) removeAndRebalance( it.node, header->parent, header->left, header->right );

	delete del;

	--node_count;

    }

#ifdef QT_QMAP_DEBUG

    void inorder( QMapNodeBase* x = 0, int level = 0 ){

	if ( !x )

	    x = header->parent;

	if ( x->left )

	    inorder( x->left, level + 1 );

    //cout << level << " Key=" << key(x) << " Value=" << ((NodePtr)x)->data << endl;

	if ( x->right )

	    inorder( x->right, level + 1 );

    }

#endif

    Iterator insertMulti(const Key& v){

	QMapNodeBase* y = header;

	QMapNodeBase* x = header->parent;

	while (x != 0){

	    y = x;

	    x = ( v < key(x) ) ? x->left : x->right;

	}

	return insert(x, y, v);

    }

    Iterator insertSingle( const Key& k ) {

	// Search correct position in the tree

	QMapNodeBase* y = header;

	QMapNodeBase* x = header->parent;

	bool result = TRUE;

	while ( x != 0 ) {

	    result = ( k < key(x) );

	    y = x;

	    x = result ? x->left : x->right;

	}

	// Get iterator on the last not empty one

	Iterator j( (NodePtr)y );

	if ( result ) {

	    // Smaller then the leftmost one ?

	    if ( j == begin() ) {

		return insert(x, y, k );

	    } else {

		// Perhaps daddy is the right one ?

		--j;

	    }

	}

	// Really bigger ?

	if ( (j.node->key) < k )

	    return insert(x, y, k );

	// We are going to replace a node

	return j;

    }

    Iterator insert( QMapNodeBase* x, QMapNodeBase* y, const Key& k ) {

	NodePtr z = new Node( k );

	if (y == header || x != 0 || k < key(y) ) {

	    y->left = z;                // also makes leftmost = z when y == header

	    if ( y == header ) {

		header->parent = z;

		header->right = z;

	    } else if ( y == header->left )

		header->left = z;           // maintain leftmost pointing to min node

	} else {

	    y->right = z;

	    if ( y == header->right )

		header->right = z;          // maintain rightmost pointing to max node

	}

	z->parent = y;

	z->left = 0;

	z->right = 0;

	rebalance( z, header->parent );

	++node_count;

	return Iterator(z);

    }

protected:

    /**

     * Helpers

     */

    const Key& key( QMapNodeBase* b ) const { return ((NodePtr)b)->key; }

    /**

     * Variables

     */

    NodePtr header;

};

template<class Key, class T>

class Q_EXPORT QMap

{

public:

    /**

     * Typedefs

     */

    typedef QMapIterator< Key, T > Iterator;

    typedef QMapConstIterator< Key, T > ConstIterator;

    typedef T ValueType;

    typedef QMapPrivate< Key, T > Priv;

    /**

     * API

     */

    QMap() { sh = new QMapPrivate< Key, T >; }

    QMap( const QMap<Key,T>& m ) { sh = m.sh; sh->ref(); }

    ~QMap() { if ( sh->deref() ) delete sh; }

    QMap<Key,T>& operator= ( const QMap<Key,T>& m )

      { m.sh->ref(); if ( sh->deref() ) delete sh; sh = m.sh; return *this; }

    Iterator begin() { detach(); return sh->begin(); }

    Iterator end() { detach(); return sh->end(); }

    ConstIterator begin() const { return ((const Priv*)sh)->begin(); }

    ConstIterator end() const { return ((const Priv*)sh)->end(); }

    Iterator find ( const Key& k )

	{ detach(); return Iterator( sh->find( k ).node ); }