// -*- c++ -*-

#ifndef VECTOR_MAP_H

#define VECTOR_MAP_H

#include <vector>

#include "extended_pair.h"

namespace lemon {

  /** The VectorMapFactory template class is a factory class

   *  to create maps for the edge and nodes. This map factory

   *  use the std::vector to implement the container function.

   *

   *  The template parameter is the MapRegistry that the maps

   *  will belong to.

   */

  template <typename MapRegistry>

  class VectorMapFactory {

  public:

    /// The graph type of the maps. 

    typedef typename MapRegistry::Graph Graph;

    /// The key type of the maps.

    typedef typename MapRegistry::Key Key;

    /// The iterator to iterate on the keys.

    typedef typename MapRegistry::KeyIt KeyIt;

    /// The MapBase of the Map which imlements the core regisitry function.

    typedef typename MapRegistry::MapBase MapBase;

    /** The template Map type.

     */

    template <typename V> 

    class Map : public MapBase {

    public:

      /// The value type of the map.

      typedef V Value;

      typedef std::vector<Value> Container;	

      /** Default constructor for the map.

       */

      Map() {}

      /** Graph and Registry initialized map constructor.

       */

      Map(const Graph& g, MapRegistry& r) : MapBase(g, r) {

	init();

      }

      /** Constructor to use default value to initialize the map. 

       */

      Map(const Graph& g, MapRegistry& r, const Value& v) : MapBase(g, r) {

	for (KeyIt it(*getGraph()); getGraph()->valid(it); getGraph()->next(it)) {

          int id = getGraph->id(it);

	  if (id >= container.size) {

	    container.resize(id + 1);

	  }

	  set(it, v);

        }

      }

      /** Constructor to copy a map of an other map type.

       */

      template <typename CMap> Map(const CMap& copy) : MapBase(copy) {

	if (getGraph()) {

	  for (KeyIt it(*getGraph()); getGraph()->valid(it); getGraph()->next(it)) {

	    int id = getGraph->id(it);

	    if (id >= container.size) {

	      container.resize(id + 1);

	    }

	    set(it, copy[it]);

	  }

	}

      }

      /** Assign operator to copy a map an other map type.

       */

      template <typename CMap> Map& operator=(const CMap& copy) {

	if (getGraph()) {

	  destroy();

	} 

	this->MapBase::operator=(copy);

	if (getGraph()) {

	  for (KeyIt it(*getGraph()); getGraph()->valid(it); getGraph()->next(it)) {

	    int id = getGraph->id(it);

	    if (id >= container.size) {

	      container.resize(id + 1);

	    }

	    set(it, copy[it]);

	  }

	}

      }

      /** The destructor of the map.

       */

      virtual ~Map() {

      }

      /**

       * The subscript operator. The map can be subscripted by the

       * actual keys of the graph. 

       */

      typename Container::reference operator[](const Key& key) {

	int id = getGraph()->id(key);

	return container[id];

      } 

      /**

       * The const subscript operator. The map can be subscripted by the

       * actual keys of the graph. 

       */

      typename Container::const_reference operator[](const Key& key) const {

	int id = getGraph()->id(key);

	return container[id];

      }

      /** Setter function of the map. Equivalent with map[key] = val.

       *  This is a compatibility feature with the not dereferable maps.

       */

      void set(const Key& key, const Value& val) {

	int id = getGraph()->id(key);

	container[id] = val;

      }

      /** Add a new key to the map. It called by the map registry.

       */

      void add(const Key& key) {

	int id = getGraph()->id(key);

	if (id >= container.size()) {

	  container.resize(id + 1);

	}

      }

      /** Erease a key from the map. It called by the map registry.

       */

      void erase(const Key& key) {}

      /** Compatible iterator with the stl maps' iterators.

       *  It iterates on pairs of a key and a value.

       */

      class iterator {

	friend class Map;

	friend class const_iterator;

      private:

	/** Private constructor to initalize the the iterators returned

	 *  by the begin() and end().

	 */

	iterator (Map& pmap, const KeyIt& pit) : map(&pmap), it(pit) {}

      public:

	/** Default constructor. 

	 */

	iterator() {}

	typedef extended_pair<const Key&, const Key&, 

			      Value&, Value&> Reference;

	/** Dereference operator for map.

	 */	 

	Reference operator*() {

	  return Reference(it, (*map)[it]);

	}

	class Pointer {

	  friend class iterator;

	private:

	  Reference data;

	  Pointer(const Key& key, Value& val) : data(key, val) {}

	public:

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

	};

	/** Arrow operator for map.

	 */	 

	Pointer operator->() {

	  return Pointer(it, ((*map)[it])); 

	}

	/** The pre increment operator of the map.

	 */

	iterator& operator++() { 

	  map->getGraph()->next(it); 

	  return *this; 

	}

	/** The post increment operator of the map.

	 */

	iterator operator++(int) { 

	  iterator tmp(it); 

	  map.getGraph()->next(it); 

	  return tmp; 

	}

	/** The equality operator of the map.

	 */

	bool operator==(const_iterator p_it) {

	  return p_it.it == it;

	}

	/** The not-equality operator of the map.

	 */

	bool operator!=(const_iterator p_it) {

	  return !(*this == p_it);

	}

      private:

	Map* map;

	KeyIt it;

      };

      /** Returns the begin iterator of the map.

       */

      iterator begin() {

	return iterator(*this, KeyIt(*getGraph()));

      }

      /** Returns the end iterator of the map.

       */

      iterator end() {

	return iterator(*this, INVALID);

      }

      class const_iterator {

	friend class Map;

	friend class iterator;

      private:

	/** Private constructor to initalize the the iterators returned

	 *  by the begin() and end().

	 */

	const_iterator (const Map& pmap, const KeyIt& pit) 

	  : map(&pmap), it(pit) {}

      public:

	/** Default constructor. 

	 */

	const_iterator() {}

	/** Constructor to convert iterator to const_iterator.

	 */

	const_iterator(iterator p_it) : map(p_it.map), it(p_it.it) {}

	typedef extended_pair<const Key&, const Key&, 

	  const Value&, const Value&> Reference;

	/** Dereference operator for map.

	 */	 

	Reference operator*() {

	  return Reference(it, (*map)[it]);

	}

	class Pointer {

	  friend class const_iterator;

	private:

	  Reference data;

	  Pointer(const Key& key, const Value& val) : data(key, val) {}

	public:

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

	};

	/** Arrow operator for map.

	 */	 

	Pointer operator->() {

	  return Pointer(it, ((*map)[it])); 

	}

	/** The pre increment operator of the map.

	 */

	const_iterator& operator++() { 

	  map->getGraph()->next(it); 

	  return *this; 

	}

	/** The post increment operator of the map.

	 */

	const_iterator operator++(int) { 

	  const_iterator tmp(it); 

	  map->getGraph()->next(it); 

	  return tmp; 

	}

	/** The equality operator of the map.

	 */

	bool operator==(const_iterator p_it) {

	  return p_it.it == it;

	}

	/** The not-equality operator of the map.

	 */

	bool operator!=(const_iterator p_it) {

	  return !(*this == p_it);

	}

      private:

	const Map* map;

	KeyIt it;

      };

      /** Returns the begin const_iterator of the map.

       */

      const_iterator begin() const {

	return const_iterator(*this, KeyIt(*getGraph()));

      }

      /** Returns the end const_iterator of the map.

       */

      const_iterator end() const {

	return const_iterator(*this, INVALID);

      }

      private:

      Container container;

    };

  };

}

#endif