/* -*- C++ -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2003-2006

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 ///\ingroup io_group

 ///\file

 ///\brief Lemon Graph Format writer.

 ///

 #ifndef LEMON_GRAPH_WRITER_H

 #define LEMON_GRAPH_WRITER_H

 #include <iostream>

 #include <lemon/error.h>

 #include <lemon/lemon_writer.h>

 namespace lemon {

   /// \addtogroup io_group

   /// @{

   /// \brief The graph writer class.

   ///

   /// The \c GraphWriter class provides the graph output. 

   /// Before you read this documentation it might be useful to read the general

   /// description of  \ref graph-io-page "Graph Input-Output".

   ///

   /// If you don't need very sophisticated

   /// behaviour then you can use the versions of the public function

   /// \ref writeGraph() to output a graph (or a max flow instance etc).

   ///

   /// To write a graph

   /// you should first give writing commands to the writer. You can declare

   /// write commands as \c NodeMap or \c EdgeMap writing and labeled Node and

   /// Edge writing.

   ///

   ///\code

   /// GraphWriter<ListGraph> writer(std::cout, graph);

   ///\endcode

   ///

   /// The \c writeNodeMap() function declares a \c NodeMap writing 

   /// command in the \c GraphWriter. You should give as parameter 

   /// the name of the map and the map object. The NodeMap writing 

   /// command with name "label" should write a unique map because it 

   /// is regarded as label map (such a map is essential if the graph has edges).

   ///

   ///\code

   /// IdMap<ListGraph, Node> nodeLabelMap;

   /// writer.writeNodeMap("label", nodeLabelMap);

   ///

   /// writer.writeNodeMap("coords", coords);

   /// writer.writeNodeMap("color", colorMap);

   ///\endcode

   ///

   /// With the \c writeEdgeMap() member function you can give an edge map

   /// writing command similar to the NodeMaps.

   ///

   ///\code

   /// DescriptorMap<ListGraph, Edge, ListGraph::EdgeMap<int> > 

   ///   edgeDescMap(graph);

   /// writer.writeEdgeMap("descriptor", edgeDescMap);

   ///

   /// writer.writeEdgeMap("weight", weightMap);

   /// writer.writeEdgeMap("label", labelMap);

   ///\endcode

   ///

   /// With \c writeNode() and \c writeEdge() functions you can 

   /// point out Nodes and Edges in the graph. For example, you can 

   /// write out the source and target of a maximum flow instance.

   ///

   ///\code

   /// writer.writeNode("source", sourceNode);

   /// writer.writeNode("target", targetNode);

   ///

   /// writer.writeEdge("observed", edge);

   ///\endcode

   ///

   /// After you give all write commands you must call the \c run() member

   /// function, which executes all the writing commands.

   ///

   ///\code

   /// writer.run();

   ///\endcode

   ///

   /// \see DefaultWriterTraits

   /// \see QuotedStringWriter

   /// \see IdMap

   /// \see DescriptorMap

   /// \see \ref GraphReader

   /// \see \ref graph-io-page

   /// \author Balazs Dezso

   template <typename _Graph, typename _WriterTraits = DefaultWriterTraits> 

   class GraphWriter {

   public:

     typedef _Graph Graph;

     typedef typename Graph::Node Node;

     typedef typename Graph::Edge Edge;

     typedef _WriterTraits WriterTraits;

     /// \brief Construct a new GraphWriter.

     ///

     /// This function constructs a new GraphWriter to write the given graph

     /// to the given stream.

     GraphWriter(std::ostream& _os, const Graph& _graph) 

       : writer(new LemonWriter(_os)), own_writer(true), 

 	nodeset_writer(*writer, _graph, std::string()),

 	edgeset_writer(*writer, _graph, nodeset_writer, std::string()),

 	node_writer(*writer, nodeset_writer, std::string()),

 	edge_writer(*writer, edgeset_writer, std::string()),

 	attribute_writer(*writer, std::string()) {}

     /// \brief Construct a new GraphWriter.

     ///

     /// This function constructs a new GraphWriter to write the given graph

     /// to the given file.

     GraphWriter(const std::string& _filename, const Graph& _graph) 

       : writer(new LemonWriter(_filename)), own_writer(true), 

 	nodeset_writer(*writer, _graph, std::string()),

 	edgeset_writer(*writer, _graph, nodeset_writer, std::string()),

 	node_writer(*writer, nodeset_writer, std::string()),

 	edge_writer(*writer, edgeset_writer, std::string()),

 	attribute_writer(*writer, std::string()) {}

     /// \brief Construct a new GraphWriter.

     ///

     /// This function constructs a new GraphWriter to write the given graph

     /// to the given LemonReader.

     GraphWriter(LemonWriter& _writer, const Graph& _graph)

       : writer(_writer), own_writer(false), 

 	nodeset_writer(*writer, _graph, std::string()),

 	edgeset_writer(*writer, _graph, nodeset_writer, std::string()),

 	node_writer(*writer, nodeset_writer, std::string()),

 	edge_writer(*writer, edgeset_writer, std::string()),

 	attribute_writer(*writer, std::string()) {}

     /// \brief Destruct the graph writer.

     ///

     /// This function destructs the graph writer.

     ~GraphWriter() {

       if (own_writer) 

 	delete writer;

     }

     /// \brief Issue a new node map writing command for the writer.

     ///

    /// This function issues a new <i> node map writing command</i> to the writer.

     template <typename Map>

     GraphWriter& writeNodeMap(std::string name, const Map& map) {

       nodeset_writer.writeNodeMap(name, map);

       return *this;

     }

     /// \brief Issue a new node map writing command for the writer.

     ///

    /// This function issues a new <i> node map writing command</i> to the writer.

     template <typename Writer, typename Map>

     GraphWriter& writeNodeMap(std::string name, const Map& map, 

 			      const Writer& writer = Writer()) {

       nodeset_writer.writeNodeMap(name, map, writer);

       return *this;

     }

     /// \brief Issue a new edge map writing command for the writer.

     ///

    /// This function issues a new <i> edge map writing command</i> to the writer.

     template <typename Map>

     GraphWriter& writeEdgeMap(std::string name, const Map& map) { 

       edgeset_writer.writeEdgeMap(name, map);

       return *this;

     }

     /// \brief Issue a new edge map writing command for the writer.

     ///

    /// This function issues a new <i> edge map writing command</i> to the writer.

     template <typename Writer, typename Map>

     GraphWriter& writeEdgeMap(std::string name, const Map& map,

 			      const Writer& writer = Writer()) {

       edgeset_writer.writeEdgeMap(name, map, writer);

       return *this;

     }

     /// \brief Issue a new labeled node writing command to the writer.

     ///

     /// This function issues a new <i> labeled node writing command</i> 

     /// to the writer.

     GraphWriter& writeNode(std::string name, const Node& node) {

       node_writer.writeNode(name, node);

       return *this;

     }

     /// \brief Issue a new labeled edge writing command to the writer.

     ///

     /// This function issues a new <i> labeled edge writing command</i> 

     /// to the writer.

     GraphWriter& writeEdge(std::string name, const Edge& edge) {

       edge_writer.writeEdge(name, edge);

     }

     /// \brief Issue a new attribute writing command.

     ///

     /// This function issues a new <i> attribute writing command</i> 

     /// to the writer.

     template <typename Value>

     GraphWriter& writeAttribute(std::string name, const Value& value) {

       attribute_writer.writeAttribute(name, value);

       return *this;

     }

     /// \brief Issue a new attribute writing command.

     ///

     /// This function issues a new <i> attribute writing command</i> 

     /// to the writer.

     template <typename Writer, typename Value>

     GraphWriter& writeAttribute(std::string name, const Value& value, 

 			       const Writer& writer) {

       attribute_writer.writeAttribute<Writer>(name, value, writer);

       return *this;

     }

     /// \brief Conversion operator to LemonWriter.

     ///

     /// Conversion operator to LemonWriter. It makes possible

     /// to access the encapsulated \e LemonWriter, this way

     /// you can attach to this writer new instances of 

     /// \e LemonWriter::SectionWriter. For more details see

     /// the \ref rwbackground "Background of Reading and Writing".

     operator LemonWriter&() {

       return *writer;

     }

     /// \brief Executes the writing commands.

     ///

     /// Executes the writing commands.

     void run() {

       writer->run();

     }

     /// \brief Write the label of the given node.

     ///

     /// It writes the label of the given node. If there was written an "label"

     /// named node map then it will write the map value belonging to the node.

     void writeLabel(std::ostream& os, const Node& item) const {

       nodeset_writer.writeLabel(os, item);

     } 

     /// \brief Write the label of the given edge.

     ///

     /// It writes the label of the given edge. If there was written an "label"

     /// named edge map then it will write the map value belonging to the edge.

     void writeLabel(std::ostream& os, const Edge& item) const {

       edgeset_writer.writeLabel(os, item);

     } 

   private:

     LemonWriter* writer;

     bool own_writer;

     NodeSetWriter<Graph, WriterTraits> nodeset_writer;

     EdgeSetWriter<Graph, WriterTraits> edgeset_writer;

     NodeWriter<Graph> node_writer;

     EdgeWriter<Graph> edge_writer;

     AttributeWriter<WriterTraits> attribute_writer;

   };

   /// \brief Write a graph to the output.

   ///

   /// It is a helper function to write a graph to the given output

   /// stream. It gives back a GraphWriter object and this object

   /// can write more maps, labeled nodes and edges and attributes.

   /// \warning Do not forget to call the \c run() function.

   ///

   /// \param os The output stream.

   /// \param g The graph.

   template <typename Graph>

   GraphWriter<Graph> graphWriter(std::ostream& os, const Graph &g) {

     return GraphWriter<Graph>(os, g);

   }

   /// \brief Write a graph to the output.

   ///

   /// It is a helper function to write a graph to the given output

   /// file. It gives back a GraphWriter object and this object

   /// can write more maps, labeled nodes and edges and attributes.

   /// \warning Do not forget to call the \c run() function.

   ///

   /// \param fn The filename.

   /// \param g The graph.

   template <typename Graph>

   GraphWriter<Graph> graphWriter(const std::string& fn, const Graph &g) {

     return GraphWriter<Graph>(fn, g);

   }

   /// \brief The undirected graph writer class.

   ///

   /// The \c UGraphWriter class provides the ugraph output. To write 

   /// a graph you should first give writing commands to the writer. You can 

   /// declare write command as \c NodeMap, \c EdgeMap or \c UEdgeMap 

   /// writing and labeled Node, Edge or UEdge writing.

   ///

   ///\code

   /// UGraphWriter<ListUGraph> writer(std::cout, graph);

   ///\endcode

   ///

   /// The \c writeNodeMap() function declares a \c NodeMap writing 

   /// command in the \c UGraphWriter. You should give as parameter 

   /// the name of the map and the map object. The NodeMap writing 

   /// command with name "label" should write a unique map because it 

   /// is regarded as label map.

   ///

   ///\code

   /// IdMap<ListUGraph, Node> nodeLabelMap;

   /// writer.writeNodeMap("label", nodeLabelMap);

   ///

   /// writer.writeNodeMap("coords", coords);

   /// writer.writeNodeMap("color", colorMap);

   ///\endcode

   ///

   /// With the \c writeUEdgeMap() member function you can give an 

   /// undirected edge map writing command similar to the NodeMaps.

   ///

   ///\code

   /// DescriptorMap<ListGraph, Edge, ListGraph::EdgeMap<int> > 

   ///   edgeDescMap(graph);

   /// writer.writeUEdgeMap("descriptor", edgeDescMap);

   ///

   /// writer.writeUEdgeMap("weight", weightMap);

   /// writer.writeUEdgeMap("label", labelMap);

   ///\endcode

   /// 

   /// The EdgeMap handling is just a syntactical sugar. It writes

   /// two undirected edge map with '+' and '-' prefix in the name.

   ///

   ///\code

   /// writer.writeEdgeMap("capacity", capacityMap);

   ///\endcode

   ///

   ///

   /// With \c writeNode() and \c writeUEdge() functions you can 

   /// designate nodes and undirected edges in the graph. For example, you can 

   /// write out the source and target of the graph.

   ///

   ///\code

   /// writer.writeNode("source", sourceNode);

   /// writer.writeNode("target", targetNode);

   ///

   /// writer.writeUEdge("observed", uEdge);

   ///\endcode

   ///

   /// After you give all write commands you must call the \c run() member

   /// function, which executes all the writing commands.

   ///

   ///\code

   /// writer.run();

   ///\endcode

   ///

   /// \see DefaultWriterTraits

   /// \see QuotedStringWriter

   /// \see IdMap

   /// \see DescriptorMap

   /// \see \ref GraphWriter

   /// \see \ref graph-io-page

   /// \author Balazs Dezso

   template <typename _Graph, typename _WriterTraits = DefaultWriterTraits> 

   class UGraphWriter {

   public:

     typedef _Graph Graph;

     typedef typename Graph::Node Node;

     typedef typename Graph::Edge Edge;

     typedef typename Graph::UEdge UEdge;

     typedef _WriterTraits WriterTraits;

     /// \brief Construct a new UGraphWriter.

     ///

     /// Construct a new UGraphWriter. It writes the given graph

     /// to the given stream.

     UGraphWriter(std::ostream& _os, const Graph& _graph) 

       : writer(new LemonWriter(_os)), own_writer(true), 

 	nodeset_writer(*writer, _graph, std::string()),

 	u_edgeset_writer(*writer, _graph, nodeset_writer, std::string()),

 	node_writer(*writer, nodeset_writer, std::string()),

 	u_edge_writer(*writer, u_edgeset_writer, std::string()),

 	attribute_writer(*writer, std::string()) {}

     /// \brief Construct a new UGraphWriter.

     ///

     /// Construct a new UGraphWriter. It writes the given graph

     /// to the given file.

     UGraphWriter(const std::string& _filename, const Graph& _graph) 

       : writer(new LemonWriter(_filename)), own_writer(true), 

 	nodeset_writer(*writer, _graph, std::string()),

 	u_edgeset_writer(*writer, _graph, nodeset_writer, std::string()),

 	node_writer(*writer, nodeset_writer, std::string()),

 	u_edge_writer(*writer, u_edgeset_writer, std::string()),

 	attribute_writer(*writer, std::string()) {}

     /// \brief Construct a new UGraphWriter.

     ///

     /// Construct a new UGraphWriter. It writes the given graph

     /// to given LemonReader.

     UGraphWriter(LemonWriter& _writer, const Graph& _graph)

       : writer(_writer), own_writer(false), 

 	nodeset_writer(*writer, _graph, std::string()),

 	u_edgeset_writer(*writer, _graph, nodeset_writer, std::string()),

 	node_writer(*writer, nodeset_writer, std::string()),

 	u_edge_writer(*writer, u_edgeset_writer, std::string()),

 	attribute_writer(*writer, std::string()) {}

     /// \brief Destruct the graph writer.

     ///

     /// Destruct the graph writer.

     ~UGraphWriter() {

       if (own_writer) 

 	delete writer;

     }

     /// \brief Issue a new node map writing command to the writer.

     ///

    /// This function issues a new <i> node map writing command</i> to the writer.

     template <typename Map>

     UGraphWriter& writeNodeMap(std::string name, const Map& map) {

       nodeset_writer.writeNodeMap(name, map);

       return *this;

     }

     /// \brief Issue a new node map writing command to the writer.

     ///

    /// This function issues a new <i> node map writing command</i> to the writer.

     template <typename Writer, typename Map>

     UGraphWriter& writeNodeMap(std::string name, const Map& map, 

 			      const Writer& writer = Writer()) {

       nodeset_writer.writeNodeMap(name, map, writer);

       return *this;

     }

     /// \brief Issue a new edge map writing command to the writer.

     ///

    /// This function issues a new <i> edge map writing command</i> to the writer.

     template <typename Map>

     UGraphWriter& writeEdgeMap(std::string name, const Map& map) { 

       u_edgeset_writer.writeEdgeMap(name, map);

       return *this;

     }

     /// \brief Issue a new edge map writing command to the writer.

     ///

    /// This function issues a new <i> edge map writing command</i> to the writer.

     template <typename Writer, typename Map>

     UGraphWriter& writeEdgeMap(std::string name, const Map& map,

 				   const Writer& writer = Writer()) {

       u_edgeset_writer.writeEdgeMap(name, map, writer);

       return *this;

     }

     /// \brief Issue a new undirected edge map writing command to the writer.

     ///

     /// This function issues a new <i> undirected edge map writing

     /// command</i> to the writer.

     template <typename Map>

     UGraphWriter& writeUEdgeMap(std::string name, const Map& map) { 

       u_edgeset_writer.writeUEdgeMap(name, map);

       return *this;

     }

     /// \brief Issue a new undirected edge map writing command to the writer.

     ///

     /// This function issues a new <i> undirected edge map writing

     /// command</i> to the writer.

    template <typename Writer, typename Map>

     UGraphWriter& writeUEdgeMap(std::string name, const Map& map,

 					const Writer& writer = Writer()) {

       u_edgeset_writer.writeUEdgeMap(name, map, writer);

       return *this;

     }

     /// \brief Issue a new labeled node writer to the writer.

     ///

     /// This function issues a new <i> labeled node writing

     /// command</i> to the writer.

     UGraphWriter& writeNode(std::string name, const Node& node) {

       node_writer.writeNode(name, node);

       return *this;

     }

     /// \brief Issue a new labeled edge writer to the writer.

     ///

     /// This function issues a new <i> labeled edge writing

     /// command</i> to the writer.

     UGraphWriter& writeEdge(std::string name, const Edge& edge) {

       u_edge_writer.writeEdge(name, edge);

     }

     /// \brief Issue a new labeled undirected edge writing command to

     /// the writer.

     ///

     /// Issue a new <i>labeled undirected edge writing command</i> to

     /// the writer.

     UGraphWriter& writeUEdge(std::string name, const UEdge& edge) {

       u_edge_writer.writeUEdge(name, edge);

     }

     /// \brief Issue a new attribute writing command.

     ///

     /// This function issues a new <i> attribute writing

     /// command</i> to the writer.

     template <typename Value>

     UGraphWriter& writeAttribute(std::string name, const Value& value) {

       attribute_writer.writeAttribute(name, value);

       return *this;

     }

     /// \brief Issue a new attribute writing command.

     ///

     /// This function issues a new <i> attribute writing

     /// command</i> to the writer.

     template <typename Writer, typename Value>

     UGraphWriter& writeAttribute(std::string name, const Value& value, 

 			       const Writer& writer) {

       attribute_writer.writeAttribute<Writer>(name, value, writer);

       return *this;

     }

     /// \brief Conversion operator to LemonWriter.

     ///

     /// Conversion operator to LemonWriter. It makes possible

     /// to access the encapsulated \e LemonWriter, this way

     /// you can attach to this writer new instances of 

     /// \e LemonWriter::SectionWriter.

     operator LemonWriter&() {

       return *writer;

     }

     /// \brief Executes the writing commands.

     ///

     /// Executes the writing commands.

     void run() {

       writer->run();

     }

     /// \brief Write the label of the given node.

     ///

     /// It writes the label of the given node. If there was written an "label"

     /// named node map then it will write the map value belonging to the node.

     void writeLabel(std::ostream& os, const Node& item) const {

       nodeset_writer.writeLabel(os, item);

     } 

     /// \brief Write the label of the given edge.

     ///

     /// It writes the label of the given edge. If there was written an "label"

     /// named edge map then it will write the map value belonging to the edge.

     void writeLabel(std::ostream& os, const Edge& item) const {

       u_edgeset_writer.writeLabel(os, item);

     } 

     /// \brief Write the label of the given undirected edge.

     ///

     /// It writes the label of the given undirected edge. If there was written 

     /// an "label" named edge map then it will write the map value belonging to 

     /// the edge.

     void writeLabel(std::ostream& os, const UEdge& item) const {

       u_edgeset_writer.writeLabel(os, item);

     } 

   private:

     LemonWriter* writer;

     bool own_writer;

     NodeSetWriter<Graph, WriterTraits> nodeset_writer;

     UEdgeSetWriter<Graph, WriterTraits> u_edgeset_writer;

     NodeWriter<Graph> node_writer;

     UEdgeWriter<Graph> u_edge_writer;

     AttributeWriter<WriterTraits> attribute_writer;

   };

   /// \brief Write an undirected graph to the output.

   ///

   /// It is a helper function to write an undirected graph to the given output

   /// stream. It gives back an UGraphWriter object and this object

   /// can write more maps, labeled nodes and edges and attributes.

   /// \warning Do not forget to call the \c run() function.

   ///

   /// \param os The output stream.

   /// \param g The graph.

   template <typename Graph>

   UGraphWriter<Graph> uGraphWriter(std::ostream& os, const Graph &g) {

     return UGraphWriter<Graph>(os, g);

   }

   /// \brief Write an undirected graph to the output.

   ///

   /// It is a helper function to write an undirected graph to the given output

   /// file. It gives back an UGraphWriter object and this object

   /// can write more maps, labeled nodes, edges, undirected edges and 

   /// attributes.

   ///

   /// \warning Do not forget to call the \c run() function.

   ///

   /// \param fn The output file.

   /// \param g The graph.

   template <typename Graph>

   UGraphWriter<Graph> uGraphWriter(const std::string& fn, 

 					   const Graph &g) {

     return UGraphWriter<Graph>(fn, g);

   }

   /// @}

 }

 #endif