package btools.mapcreator;

import java.io.DataOutputStream;
import java.io.File;

import btools.util.DenseLongMap;
import btools.util.TinyDenseLongMap;

/**
 * WayCutter5 does 2 step in map-processing:
 *
 * - cut the 45*30 way files into 5*5 pieces
 * - create a file containing all border node ids
 *
 * @author ab
 */
public class WayCutter5 extends MapCreatorBase
{
  private DataOutputStream borderNidsOutStream;
  private DenseLongMap tileIndexMap;
  private File nodeTilesIn;
  private int lonoffset;
  private int latoffset;

  public static void main(String[] args) throws Exception
  {
    System.out.println("*** WayCutter5: Soft-Cut way-data into tiles");
    if (args.length != 4)
    {
      System.out.println("usage: java WayCutter5 <node-tiles-in> <way-tiles-in> <way-tiles-out> <border-nids-out>" );
      return;
    }
    new WayCutter5().process( new File( args[0] ), new File( args[1] ), new File( args[2] ), new File( args[3] ) );
  }

  public void process( File nodeTilesIn, File wayTilesIn, File wayTilesOut, File borderNidsOut ) throws Exception
  {
    this.nodeTilesIn = nodeTilesIn;
    this.outTileDir = wayTilesOut;

    borderNidsOutStream = createOutStream( borderNidsOut );

    new WayIterator( this, true ).processDir( wayTilesIn, ".wtl" );

    borderNidsOutStream.close();
  }

  @Override
  public boolean wayFileStart( File wayfile ) throws Exception
  {
    // read corresponding node-file into tileIndexMap
    String name = wayfile.getName();
    String nodefilename = name.substring( 0, name.length()-3 ) + "tlf";
    File nodefile = new File( nodeTilesIn, nodefilename );

    tileIndexMap = Boolean.getBoolean( "useDenseMaps" ) ? new DenseLongMap() : new TinyDenseLongMap();
    lonoffset = -1;
    latoffset = -1;
    new NodeIterator( this, false ).processFile( nodefile );
    return true;
  }

  @Override
  public void nextNode( NodeData n ) throws Exception
  {
    tileIndexMap.put( n.nid, getTileIndex( n.ilon, n.ilat ) );
  }

  @Override
  public void nextWay( WayData data ) throws Exception
  {
    long waytileset = 0;
    int nnodes = data.nodes.size();
    int[] tiForNode = new int[nnodes];

    // determine the tile-index for each node
    for (int i=0; i<nnodes; i++ )
    {
      int tileIndex = tileIndexMap.getInt( data.nodes.get(i) );
      if ( tileIndex != -1 )
      {
        waytileset |= ( 1L << tileIndex );
      }
      tiForNode[i] = tileIndex;
    }

    // now write way to all tiles hit
    for( int tileIndex=0; tileIndex<54; tileIndex++ )
    {
      if ( ( waytileset & ( 1L << tileIndex ) ) == 0 )
      {
        continue;
      }
      data.writeTo( getOutStreamForTile( tileIndex ) );
    }

    // and write edge nodes to the border-nid file
    for( int i=0; i < nnodes; i++ )
    {
      int ti = tiForNode[i];
      if ( ti != -1 )
      {
        if ( ( i > 0 && tiForNode[i-1] != ti ) || (i+1 < nnodes && tiForNode[i+1] != ti ) )
        {
          writeId( borderNidsOutStream, data.nodes.get(i) );
        }
      }
    }
  }

  @Override
  public void wayFileEnd( File wayFile ) throws Exception
  {
    closeTileOutStreams();
  }

  private int getTileIndex( int ilon, int ilat )
  {
     int lonoff = (ilon / 45000000 ) * 45;
     int latoff = (ilat / 30000000 ) * 30;
     if ( lonoffset == -1 ) lonoffset = lonoff;
     if ( latoffset == -1 ) latoffset = latoff;
     if ( lonoff != lonoffset || latoff != latoffset )
       throw new IllegalArgumentException( "inconsistent node: " + ilon + " " + ilat );

     int lon = (ilon / 5000000) % 9;
     int lat = (ilat / 5000000) % 6;
     if ( lon < 0 || lon > 8 || lat < 0 || lat > 5 ) throw new IllegalArgumentException( "illegal pos: " + ilon + "," + ilat );
     return lon*6 + lat;
  }


  protected String getNameForTile( int tileIndex )
  {
    int lon = (tileIndex / 6 ) * 5 + lonoffset - 180;
    int lat = (tileIndex % 6 ) * 5 + latoffset - 90;
    String slon = lon < 0 ? "W" + (-lon) : "E" + lon;
    String slat = lat < 0 ? "S" + (-lat) : "N" + lat;
    return slon + "_" + slat + ".wt5";
  }
}