// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2018, Knut Reinert, FU Berlin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of Knut Reinert or the FU Berlin nor the names of
//       its contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL KNUT REINERT OR THE FU BERLIN BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
//
// ==========================================================================


#ifndef SEQAN_HEADER_GRAPH_DRAWING_H
#define SEQAN_HEADER_GRAPH_DRAWING_H

namespace seqan
{

//////////////////////////////////////////////////////////////////////////////
// Graph - Drawing
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////


//////////////////////////////////////////////////////////////////////////////
// WRITING
//////////////////////////////////////////////////////////////////////////////



//////////////////////////////////////////////////////////////////////////////
// INTERNAL FUNCTIONS
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////


//////////////////////////////////////////////////////////////////////////////

template <typename TAlphabet, typename TCargo, typename TSpec, typename TVertexDescriptor, typename TAttributes>
inline void
_markRootVertex(Graph<Automaton<TAlphabet, TCargo, TSpec> > const& g,
                TVertexDescriptor const& v,
                TAttributes& str)
{
    if (isRoot(g,v)) {
        append(str, ", shape = doublecircle");
    }
}

//////////////////////////////////////////////////////////////////////////////

template <typename TCargo, typename TSpec, typename TVertexDescriptor, typename TAttributes>
inline void
_markRootVertex(Graph<Directed<TCargo, TSpec> > const&,
                TVertexDescriptor const&,
                TAttributes&)
{
}

//////////////////////////////////////////////////////////////////////////////

template <typename TCargo, typename TSpec, typename TVertexDescriptor, typename TAttributes>
inline void
_markRootVertex(Graph<Undirected<TCargo, TSpec> > const&,
                TVertexDescriptor const&,
                TAttributes&)
{
}


//////////////////////////////////////////////////////////////////////////////

template <typename TCargo, typename TSpec, typename TVertexDescriptor, typename TAttributes>
inline void
_markRootVertex(Graph<Tree<TCargo, TSpec> > const& g,
                TVertexDescriptor const& v,
                TAttributes& str)
{
    if (isRoot(g,v)) {
        append(str, ", shape = doublecircle");
    }
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TSpec, typename TPosition, typename TNodeMap>
inline void
_createTrieNodeAttributes(Graph<Automaton<TAlphabet, TCargo, TSpec> > const& g,
                          String<String<TPosition> > pos,
                          TNodeMap& nodeMap)
{
    typedef Graph<Automaton<TAlphabet, TCargo, TSpec> > TGraph;
    resizeVertexMap(nodeMap, g);
    typedef typename Iterator<TGraph, VertexIterator>::Type TConstIter;
    TConstIter it(g);
    for(;!atEnd(it);++it) {
        String<char> tmp;
        std::stringstream s;
        s << *it;
        String<TPosition> endPositions = getProperty(pos,*it);
        if (!empty(endPositions)) {
            s <<  " {";
            append(tmp, "shape = box, ");
            typename Iterator<String<TPosition>, Rooted>::Type itP = begin(endPositions);
            typename Iterator<String<TPosition>, Rooted>::Type beginP = itP;
            for(;!atEnd(itP);goNext(itP)) {
                if (beginP != itP) s << ", ";
                s << *itP;
            }
            s << "}";
        }

        append(tmp, "label = \"");
        append(tmp, s.str().c_str());
        append(tmp, "\"");
        _markRootVertex(g, *it, tmp);
        assignProperty(nodeMap, *it, tmp);
    }
}

//////////////////////////////////////////////////////////////////////////////

template<typename TSpec, typename TNodeAttributes>
inline void
_createNodeAttributes(Graph<TSpec> const& g,
                      TNodeAttributes& nodeMap)
{
    typedef Graph<TSpec> TGraph;
    resizeVertexMap(nodeMap, g);

    typedef typename Iterator<TGraph, VertexIterator>::Type TConstIter;
    TConstIter it(g);
    for(;!atEnd(it);++it) {
        std::ostringstream outs;
        outs << "label = \"";
        outs << *it;
        outs << "\"";
        String<char> tmp;
        append(tmp, outs.str().c_str());
        _markRootVertex(g, *it, tmp);
        assignProperty(nodeMap, *it, tmp);
    }
}

//////////////////////////////////////////////////////////////////////////////

template<typename TSpec, typename TNodeAttributes, typename TNameMap>
inline void
_createNodeAttributes(Graph<TSpec> const& g,
                      TNodeAttributes& nodeMap,
                      TNameMap const& nameMap)
{
    typedef Graph<TSpec> TGraph;
    resizeVertexMap(nodeMap, g);

    typedef typename Iterator<TGraph, VertexIterator>::Type TConstIter;
    TConstIter it(g);
    for(;!atEnd(it);++it) {
        std::ostringstream outs;
        outs << "label = \"";
        outs << getProperty(nameMap,*it);
        outs << "\"";
        String<char> tmp;
        append(tmp, outs.str().c_str());
        _markRootVertex(g, *it, tmp);
        assignProperty(nodeMap, *it, tmp);
    }
}

//////////////////////////////////////////////////////////////////////////////
template<typename TSpec, typename TEdgeAttributes>
inline void
_createEmptyEdgeAttributes(Graph<TSpec> const& g,
                           TEdgeAttributes& edgeMap)
{
    typedef Graph<TSpec> TGraph;
    resizeEdgeMap(edgeMap, g);

    typedef typename Iterator<TGraph, EdgeIterator>::Type TConstEdIter;
    TConstEdIter itEd(g);
    for(;!atEnd(itEd);++itEd) {
        assignProperty(edgeMap, *itEd, String<char>(""));
    }
}

//////////////////////////////////////////////////////////////////////////////

template <typename TCargo, typename TSpec, typename TEdgeAttributes>
inline void
_createEdgeAttributes(Graph<Directed<TCargo, TSpec> > const& g,
                      TEdgeAttributes& edgeMap)
{
    _createEmptyEdgeAttributes(g,edgeMap);
}

//////////////////////////////////////////////////////////////////////////////

template <typename TCargo, typename TSpec, typename TEdgeAttributes>
inline void
_createEdgeAttributes(Graph<Undirected<TCargo, TSpec> > const& g,
                      TEdgeAttributes& edgeMap)
{
    _createEmptyEdgeAttributes(g,edgeMap);
}

//////////////////////////////////////////////////////////////////////////////

template <typename TSpec, typename TEdgeAttributes>
inline void
_createEdgeAttributes(Graph<Tree<void, TSpec> > const& g,
                      TEdgeAttributes& edgeMap)
{
    _createEmptyEdgeAttributes(g,edgeMap);
}

//////////////////////////////////////////////////////////////////////////////

template <typename TCargo, typename TSpec, typename TEdgeAttributes>
inline void
_createEdgeAttributes(Graph<Tree<TCargo, TSpec> > const& g,
                      TEdgeAttributes& edgeMap)
{
    typedef Graph<Tree<TCargo, TSpec> > TGraph;
    resizeEdgeMap(edgeMap, g);

    typedef typename Iterator<TGraph, EdgeIterator>::Type TConstEdIter;
    TConstEdIter itEd(g);
    for(;!atEnd(itEd);++itEd) {
        std::ostringstream outs;
        outs << "label = \"";
        outs << (TCargo) getCargo(*itEd);
        outs << "\"";
        append(property(edgeMap, *itEd), outs.str().c_str());
    }
}

//////////////////////////////////////////////////////////////////////////////

template <typename TAlphabet, typename TCargo, typename TSpec, typename TEdgeAttributes>
inline void
_createEdgeAttributes(Graph<Automaton<TAlphabet, TCargo, TSpec> > const& g,
                      TEdgeAttributes& edgeMap)
{
    typedef Graph<Automaton<TAlphabet, TCargo, TSpec> > TGraph;
    resizeEdgeMap(edgeMap, g);

    typedef typename Iterator<TGraph, EdgeIterator>::Type TConstEdIter;
    TConstEdIter itEd(g);
    for(;!atEnd(itEd);++itEd) {
        String<char> tmp("label = \"");
        append(tmp, label(itEd));
        append(tmp, "\"");
        assignProperty(edgeMap, *itEd, tmp);
    }
}


//////////////////////////////////////////////////////////////////////////////

template <typename TAlphabet, typename TCargo, typename TSpec, typename TEdgeAttributes>
inline void
_createEdgeAttributes(Graph<Automaton<TAlphabet, TCargo, WordGraph<TSpec> > > const& g,
                      TEdgeAttributes& edgeMap)
{
    typedef Graph<Automaton<TAlphabet, TCargo, WordGraph<TSpec> > > TGraph;
    resizeEdgeMap(edgeMap, g);

    typedef typename Iterator<TGraph, EdgeIterator>::Type TConstEdIter;
    TConstEdIter itEd(g);
    for(;!atEnd(itEd);++itEd) {
        String<TAlphabet> labelTmp = getCargo(*itEd);
        String<char> str;
        resize(str,length(labelTmp)+1);
        value(str,0) = label(itEd);
        typename Iterator<String<TAlphabet>, Rooted>::Type it = begin(labelTmp);
        for(;!atEnd(it);++it) {
            char c = convert<char>(getValue(it));
            value(str,position(it) + 1) = c;
        }
        String<char> tmp("label = \"");
        append(tmp, str);
        append(tmp, "\"");
        assignProperty(edgeMap, *itEd, tmp);
    }
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeGraphFooter(TFile &,
                  Graph<Directed<TCargo, TSpec> > const&,
                  DotDrawing)
{
//IOREV
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeGraphFooter(TFile &,
                  Graph<Undirected<TCargo, TSpec> > const&,
                  DotDrawing)
{
//IOREV
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeGraphFooter(TFile &,
                  Graph<Tree<TCargo, TSpec> > const&,
                  DotDrawing)
{
//IOREV
}


//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TAlphabet, typename TCargo, typename TSpec>
inline void
_writeGraphFooter(TFile &,
                  Graph<Automaton<TAlphabet, TCargo, TSpec> > const&,
                  DotDrawing)
{
//IOREV
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TAlphabet, typename TCargo, typename TSpec>
inline void
_writeGraphType(TFile & file,
                Graph<Automaton<TAlphabet, TCargo, TSpec> > const&,
                DotDrawing)
{
//IOREV
    write(file, "digraph");
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeGraphType(TFile & file,
                Graph<Directed<TCargo, TSpec> > const&,
                DotDrawing)
{
//IOREV
    write(file, "digraph");
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeGraphType(TFile & file,
                Graph<Undirected<TCargo, TSpec> > const&,
                DotDrawing)
{
//IOREV
    write(file, "graph");
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeGraphType(TFile & file,
                Graph<Tree<TCargo, TSpec> > const&,
                DotDrawing)
{
//IOREV
    write(file, "digraph");
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TAlphabet, typename TCargo, typename TSpec>
inline void
_writeEdgeType(TFile & file,
               Graph<Automaton<TAlphabet, TCargo, TSpec> > const&,
               DotDrawing)
{
//IOREV
    write(file, " -> ");
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeEdgeType(TFile & file,
               Graph<Directed<TCargo, TSpec> > const&,
               DotDrawing)
{
//IOREV
    write(file, " -> ");
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeEdgeType(TFile & file,
               Graph<Undirected<TCargo, TSpec> > const&,
               DotDrawing)
{
//IOREV
    write(file, " -- ");
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TCargo, typename TSpec>
inline void
_writeEdgeType(TFile & file,
               Graph<Tree<TCargo, TSpec> > const&,
               DotDrawing)
{
//IOREV
    write(file, " -> ");
}

//////////////////////////////////////////////////////////////////////////////
// FUNCTIONS
//////////////////////////////////////////////////////////////////////////////


//////////////////////////////////////////////////////////////////////////////

/*!
 * @fn Graph#write
 * @brief The graph to write out.
 *
 * @signature void write(file, graph[, nodeMap[, edgeMap]], tag);
 *
 * @param[in,out] file    The @link StreamConcept @endlink to write to.
 * @param[in]     graph   The @link Graph @endlink to write out.
 * @param[in]     nodeMap Vertex labels for each vertex; optional.
 * @param[in]     edgeMap Edge label for each edge; optional.
 * @param[in]     tag     Format tag to use for writing.  Types: DotDrawing.
 */

template <typename TTarget, typename TSpec, typename TNodeAttributes, typename TEdgeAttributes>
void
writeRecords(
    TTarget & target,
    Graph<TSpec> const& g,
    TNodeAttributes const& nodeMap,
    TEdgeAttributes const& edgeMap,
    DotDrawing)
{
    typedef Graph<TSpec> TGraph;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;
    typename DirectionIterator<TTarget, Output>::Type iter = directionIterator(target, Output());

    _writeGraphType(iter,g,DotDrawing());
    write(iter, " G {\n");
    writeValue(iter, '\n');
    write(iter, "/* Graph Attributes */\n");
    write(iter, "graph [rankdir = LR];\n");
    writeValue(iter, '\n');
    write(iter, "/* Node Attributes */\n");
    write(iter, "node [shape = rectangle, fillcolor = white, style = filled, fontname = \"Times-Italic\"];\n");
    writeValue(iter, '\n');
    write(iter, "/* Edge Attributes */\n");
    write(iter, "edge [fontname = \"Times-Italic\", arrowsize = 0.75, fontsize = 16];\n");
    writeValue(iter, '\n');

    write(iter, "/* Nodes */\n");
    typedef typename Iterator<TGraph, VertexIterator>::Type TConstIter;
    TConstIter it(g);
    for(;!atEnd(it);++it) {
        appendNumber(iter, (int)*it);
        write(iter, " [");
        write(iter, getProperty(nodeMap, *it));
        write(iter, "];\n");
    }
    writeValue(iter, '\n');

    write(iter, "/* Edges */\n");
    typedef typename Iterator<TGraph, EdgeIterator>::Type TConstEdIter;
    TConstEdIter itEd(g);
    for(;!atEnd(itEd);++itEd) {
        TVertexDescriptor sc = sourceVertex(itEd);
        TVertexDescriptor tr = targetVertex(itEd);
        appendNumber(iter, sc);
        _writeEdgeType(iter, g, DotDrawing());
        appendNumber(iter, tr);
        write(iter, " [");
        write(iter, getProperty(edgeMap, *itEd));
        write(iter, "];\n");
    }
    writeValue(iter, '\n');

    _writeGraphFooter(iter,g,DotDrawing());

    write(iter, "}\n");
}

//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TSpec, typename TNodeAttributes>
inline void
writeRecords(
    TFile & file,
    Graph<TSpec> const& g,
    TNodeAttributes const& nodeMap,
    DotDrawing)
{
//IOREV _doc_ _batchreading_
    String<String<char> > edgeMap;
    _createEdgeAttributes(g,edgeMap);
    writeRecords(file,g,nodeMap,edgeMap,DotDrawing());
}


//////////////////////////////////////////////////////////////////////////////

template <typename TFile, typename TSpec>
inline void
writeRecords(
    TFile & file,
    Graph<TSpec> const& g,
    DotDrawing)
{
//IOREV _doc_ _batchreading_
    String<String<char> > nodeMap;
    _createNodeAttributes(g,nodeMap);
    String<String<char> > edgeMap;
    _createEdgeAttributes(g,edgeMap);
    writeRecords(file,g,nodeMap,edgeMap,DotDrawing());
}





//////////////////////////////////////////////////////////////////////////////
// READING
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TSpec, typename TStatement, typename TNodeAttributes, typename TEdgeAttributes, typename TNodeIdMap>
inline void
_addNode(Graph<TSpec>& g,
         TStatement& node_id,
         TStatement& attr_list,
         TNodeAttributes& nodeMap,
         TEdgeAttributes&,
         TNodeIdMap& nodeIdMap)
{
    typedef Graph<TSpec> TGraph;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;

    if (nodeIdMap.find(node_id) == nodeIdMap.end()) {
        TVertexDescriptor _id = addVertex(g);
        nodeIdMap.insert(std::make_pair(node_id, _id));
        resizeVertexMap(nodeMap, g);
        assignProperty(nodeMap, _id, attr_list);
    }
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TSpec, typename TVertexDescriptor, typename TNodeAttributes, typename TEdgeAttributes, typename TStatement>
inline void
_addEdge(Graph<Directed<TCargo, TSpec> >& g,
         TVertexDescriptor sourceV,
         TVertexDescriptor targetV,
         TNodeAttributes&,
         TEdgeAttributes& edgeMap,
         TStatement& attr_list)
{
    typedef Graph<Directed<TCargo, TSpec> > TGraph;
    typedef typename EdgeDescriptor<TGraph>::Type TEdgeDescriptor;
    TEdgeDescriptor e = addEdge(g, sourceV, targetV);
    resizeEdgeMap(edgeMap, g);
    assignProperty(edgeMap, e, attr_list);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TSpec, typename TVertexDescriptor, typename TNodeAttributes, typename TEdgeAttributes, typename TStatement>
inline void
_addEdge(Graph<Undirected<TCargo, TSpec> >& g,
         TVertexDescriptor sourceV,
         TVertexDescriptor targetV,
         TNodeAttributes&,
         TEdgeAttributes& edgeMap,
         TStatement& attr_list)
{
    typedef Graph<Undirected<TCargo, TSpec> > TGraph;
    typedef typename EdgeDescriptor<TGraph>::Type TEdgeDescriptor;
    TEdgeDescriptor e = addEdge(g, sourceV, targetV);
    resizeEdgeMap(edgeMap, g);
    assignProperty(edgeMap, e, attr_list);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TCargo, typename TSpec, typename TVertexDescriptor, typename TNodeAttributes, typename TEdgeAttributes, typename TStatement>
inline void
_addEdge(Graph<Tree<TCargo, TSpec> >& g,
         TVertexDescriptor sourceV,
         TVertexDescriptor targetV,
         TNodeAttributes&,
         TEdgeAttributes& edgeMap,
         TStatement& attr_list)
{
    typedef Graph<Tree<TCargo, TSpec> > TGraph;
    typedef typename EdgeDescriptor<TGraph>::Type TEdgeDescriptor;
    TEdgeDescriptor e = addEdge(g, sourceV, targetV);
    resizeEdgeMap(edgeMap, g);
    assignProperty(edgeMap, e, attr_list);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TSpec, typename TString>
inline typename Alphabet<Graph<Automaton<TAlphabet, TCargo, TSpec> > >::Type
_getInternalLabel(Graph<Automaton<TAlphabet, TCargo, TSpec> >&,
                  TString& str)
{
    return str[0];
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TSpec, typename TString>
inline String<TAlphabet>
_getInternalLabel(Graph<Automaton<TAlphabet, TCargo, WordGraph<TSpec> > >&,
                  TString& str)
{
    return str;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TAlphabet, typename TCargo, typename TSpec, typename TVertexDescriptor, typename TNodeAttributes, typename TEdgeAttributes, typename TStatement>
inline void
_addEdge(Graph<Automaton<TAlphabet, TCargo, TSpec> >& g,
         TVertexDescriptor sourceV,
         TVertexDescriptor targetV,
         TNodeAttributes&,
         TEdgeAttributes& edgeMap,
         TStatement& attr_list)
{
    typedef Graph<Automaton<TAlphabet, TCargo, TSpec> > TGraph;
    typedef typename EdgeDescriptor<TGraph>::Type TEdgeDescriptor;

    // We need the label
    typedef typename Value<TStatement>::Type TValue;
    typedef typename Iterator<TStatement>::Type TIter;
    typedef typename Position<TIter>::Type TPos;

    String<TValue> label;
    TIter it = begin(attr_list);
    bool found = false;
    for(;!atEnd(it);goNext(it)) {
        TPos pos = position(it);
        if (*it == ',') {
            found = false;
        } else if (found) {
            append(label, *it);
        } else if ((pos + 5 < length(attr_list)) &&
            (infix(attr_list, it, it + 5) == "label"))
        {
                found = true;
                it += 5;
        }
    }
    TEdgeDescriptor e = addEdge(g, sourceV, targetV, _getInternalLabel(g, label));
    resizeEdgeMap(edgeMap, g);
    assignProperty(edgeMap, e, attr_list);
}


//////////////////////////////////////////////////////////////////////////////

template<typename TSpec, typename TStatement, typename TNodeAttributes, typename TEdgeAttributes, typename TNodeIdMap>
inline void
_addEdge(Graph<TSpec>& g,
         TStatement& left_node_id,
         TStatement& right_node_id,
         TStatement& attr_list,
         TNodeAttributes& nodeMap,
         TEdgeAttributes& edgeMap,
         TNodeIdMap& nodeIdMap)
{
    typedef Graph<TSpec> TGraph;
    typedef typename Value<TStatement>::Type TValue;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;
    typedef std::map<String<TValue>, TVertexDescriptor> TMap;

    TVertexDescriptor sourceV;
    TVertexDescriptor targetV;

    typename TMap::iterator pos;
    pos = nodeIdMap.find(left_node_id);
    if (pos == nodeIdMap.end()) return;
    else sourceV = pos->second;

    pos = nodeIdMap.find(right_node_id);
    if (pos == nodeIdMap.end()) return;
    else targetV = pos->second;

    _addEdge(g, sourceV, targetV, nodeMap, edgeMap, attr_list);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TSpec, typename TStatement, typename TNodeAttributes, typename TEdgeAttributes, typename TNodeIdMap>
inline void
_processNodeStatement(Graph<TSpec>& g,
                      TStatement& stmt,
                      TNodeAttributes& nodeMap,
                      TEdgeAttributes& edgeMap,
                      TNodeIdMap& nodeIdMap)
{
    typedef typename Value<TStatement>::Type TValue;
    typedef typename Iterator<TStatement>::Type TIter;

    String<TValue> node_id;
    String<TValue> attr_list;  // Multiple attribute lists are ignored
    bool inAttr = false;
    TIter it = begin(stmt);
    for(;!atEnd(it);goNext(it)) {
        if (*it == '[') {
            inAttr = true;
            continue;
        } else if (*it == ']') {
            // Finished
            break;
        } else if ((*it == ' ') ||
            (*it == '"')) {
            continue;
        }
        if (inAttr) {
            append(attr_list, *it);
        } else {
            append(node_id, *it);
        }
    }
    _addNode(g, node_id, attr_list, nodeMap, edgeMap, nodeIdMap);
}


//////////////////////////////////////////////////////////////////////////////

template<typename TSpec, typename TStatement, typename TNodeAttributes, typename TEdgeAttributes, typename TPosition, typename TNodeIdMap>
inline void
_processEdgeStatement(Graph<TSpec>& g,
                      TStatement& stmt,
                      TNodeAttributes& nodeMap,
                      TEdgeAttributes& edgeMap,
                      TPosition pos,
                      TNodeIdMap& nodeIdMap)
{
    typedef typename Value<TStatement>::Type TValue;
    typedef typename Iterator<TStatement>::Type TIter;

    String<TValue> left_node_id;
    String<TValue> right_node_id;
    String<TValue> attr_list;  // Multiple attribute lists are ignored
    bool inAttr = false;
    TIter it = begin(stmt);
    unsigned int localPos = 0;
    for(;!atEnd(it);goNext(it), ++localPos) {
        if (*it == '[') {
            inAttr = true;
            continue;
        } else if (*it == ']') {
            // Finished
            break;
        } else if ((*it == ' ') ||
            (*it == '"')) {
            continue;
        }
        if (inAttr) {
            append(attr_list, *it);
        } else if (localPos < pos) {
            append(left_node_id, *it);
        } else if (localPos > pos+1) {
            append(right_node_id, *it);
        }
    }
    //std::cout << left_node_id << "," << right_node_id << "," << std::endl;
    _addEdge(g, left_node_id, right_node_id, attr_list, nodeMap, edgeMap, nodeIdMap);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TSpec, typename TStatement, typename TNodeAttributes, typename TEdgeAttributes, typename TNodeIdMap>
inline void
_processStatement(Graph<TSpec>& g,
                  TStatement& stmt,
                  TNodeAttributes& nodeMap,
                  TEdgeAttributes& edgeMap,
                  TNodeIdMap& nodeIdMap)
{
    // Clear everything up to the last line
    typedef typename Value<TStatement>::Type TValue;
    typedef typename Iterator<TStatement>::Type TIter;

    // Exclude header and empty lines
    TIter it = begin(stmt);
    String<TValue> _id;
    for(;!atEnd(it);goNext(it)) {
      if ((*it != '\t') && (*it != ' ') && (*it != '\n') && (*it != '\r')) {
        append(_id, *it);
      } else {
        // Exclude any graph, subgraph, node and edge processing attributes
        if ((_id == "graph") || (_id == "node") || (_id == "edge") || (_id == "subgraph") || (length(_id)<1)) {
          clear(stmt);
          return;
        } else break;
      }
    }

    // Process Edges
    it = begin(stmt);
    clear(_id);
    _id = "00";
    unsigned int pos = 0;
    for(;!atEnd(it);goNext(it), ++pos) {
      _id[pos % 2] = *it;
      if ((_id == "--") || (_id == "->")) {
        //std::cout << stmt << std::endl;
        _processEdgeStatement(g, stmt, nodeMap, edgeMap, pos - 1, nodeIdMap);
        clear(stmt);
        return;
      }
    }

    // Process nodes
    //std::cout << stmt << std::endl;
    _processNodeStatement(g, stmt, nodeMap, edgeMap, nodeIdMap);
    clear(stmt);
}


//////////////////////////////////////////////////////////////////////////////

template <typename TSpec, typename TNodeAttributes, typename TEdgeAttributes, typename TInStream>
void readRecords(
    Graph<TSpec>& g,
    TNodeAttributes& nodeMap,
    TEdgeAttributes& edgeMap,
    TInStream & stream,
    DotDrawing)
{
    typename DirectionIterator<TInStream, Input>::Type reader = directionIterator(stream, Input());

    typedef Graph<TSpec> TGraph;
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor;
    typedef std::map<CharString, TVertexDescriptor> TMap;
    TMap nodeIdMap;

    CharString stmt;
    while (!atEnd(reader))
    {
        clear(stmt);
        readUntil(stmt, reader, EqualsChar<';'>());
        _processStatement(g, stmt, nodeMap, edgeMap, nodeIdMap);
        skipLine(reader);
    }
}

//////////////////////////////////////////////////////////////////////////////

template <typename TSpec, typename TInStream>
void readRecords(
    Graph<TSpec>& g,
    TInStream & stream,
    DotDrawing)
{
    String<CharString> nodeMap;
    String<CharString> edgeMap;
    readRecords(g, nodeMap, edgeMap, stream, DotDrawing());
}


}// namespace seqan

#endif //#ifndef SEQAN_HEADER_...
