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/*
 * Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
 *
 *   Portions of this software were developed by the Unidata Program at the
 *   University Corporation for Atmospheric Research.
 *
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 *   any fee or cost, to use, copy, modify, alter, enhance and distribute
 *   this software, and any derivative works thereof, and its supporting
 *   documentation for any purpose whatsoever, provided that this entire
 *   notice appears in all copies of the software, derivative works and
 *   supporting documentation.  Further, UCAR requests that the user credit
 *   UCAR/Unidata in any publications that result from the use of this
 *   software or in any product that includes this software. The names UCAR
 *   and/or Unidata, however, may not be used in any advertising or publicity
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 */

package ucar.nc2.ft.point.standard;

import ucar.nc2.ft.point.SectionCollectionImpl;
import ucar.nc2.ft.point.ProfileFeatureImpl;
import ucar.nc2.ft.point.SectionFeatureImpl;
import ucar.nc2.ft.*;
import ucar.nc2.units.DateUnit;
import ucar.ma2.StructureData;
import ucar.ma2.StructureDataIterator;
import ucar.unidata.geoloc.LatLonRect;

import java.io.IOException;
import java.util.Date;

/**
 * Nested Table implementation of SectionCollection.
 * a collection of section features
 *
 * @author caron
 * @since Oct 22, 2009
 */


public class StandardSectionCollectionImpl extends SectionCollectionImpl {
  private NestedTable ft;

  StandardSectionCollectionImpl(NestedTable ft, DateUnit timeUnit, String altUnits) throws IOException {
    super(ft.getName(), timeUnit, altUnits);
    this.ft = ft;
    this.extras = ft.getExtras();
  }

  @Override
  public NestedPointFeatureCollectionIterator getNestedPointFeatureCollectionIterator(int bufferSize) throws IOException {
    return new NestedPointFeatureCollectionIterator() {
      private StructureDataIterator sdataIter = ft.getRootFeatureDataIterator(-1);
      private StructureData nextSection;

      public SectionFeature next() throws IOException {
        Cursor cursor = new Cursor(ft.getNumberOfLevels());
        cursor.recnum[2] = sdataIter.getCurrentRecno();
        cursor.tableData[2] = nextSection; // obs(leaf) = 0, profile=1, section(root)=2
        cursor.currentIndex = 2;
        ft.addParentJoin(cursor); // there may be parent joins

        return new StandardSectionFeature(cursor, nextSection);
      }

      public boolean hasNext() throws IOException {
        while (true) {
          if (!sdataIter.hasNext()) return false;
          nextSection = sdataIter.next();
          if (!ft.isFeatureMissing(nextSection)) break;
        }
        return true;
      }

      public void setBufferSize(int bytes) {
      }

      @Override
      public void finish() {
        sdataIter.finish();
      }
    };
  }

  // a single section: a collection of profiles along a trajectory
  private class StandardSectionFeature extends SectionFeatureImpl {
    Cursor cursor;
    StructureData sectionData;

    StandardSectionFeature(Cursor cursor, StructureData sectionData) {
      super(ft.getFeatureName(cursor), StandardSectionCollectionImpl.this.getTimeUnit(), StandardSectionCollectionImpl.this.getAltUnits());
      this.cursor = cursor;
      this.sectionData = sectionData;
    }

    @Override
    public PointFeatureCollectionIterator getPointFeatureCollectionIterator(int bufferSize) throws IOException {
      return new StandardSectionFeatureIterator(cursor.copy());
    }

    @Override
    public NestedPointFeatureCollection subset(LatLonRect boundingBox) throws IOException {
      return null;  //To change body of implemented methods use File | Settings | File Templates.
    }

    public StructureData getFeatureData() throws IOException {
      return sectionData;
    }
  }

  private class StandardSectionFeatureIterator implements PointFeatureCollectionIterator {
    Cursor cursor;
    private ucar.ma2.StructureDataIterator iter;
    StructureData profileData;

    StandardSectionFeatureIterator(Cursor cursor) throws IOException {
      this.cursor = cursor;
      iter = ft.getMiddleFeatureDataIterator(cursor, -1);
    }

    public boolean hasNext() throws IOException {
      return iter.hasNext();
    }

    public PointFeatureCollection next() throws IOException {
      Cursor cursorIter = cursor.copy();
      profileData = iter.next();
      cursorIter.tableData[1] = profileData;
      cursorIter.recnum[1] = iter.getCurrentRecno();
      cursorIter.currentIndex = 1;
      ft.addParentJoin(cursor); // there may be parent joins

      // double time = ft.getObsTime(cursorIter);
      return new StandardSectionProfileFeature(cursorIter, ft.getObsTime(cursor), profileData);
    }

    public void setBufferSize(int bytes) {
      iter.setBufferSize(bytes);
    }

    @Override
    public void finish() {
      iter.finish();
    }

  }

  // LOOK duplicate from StandardProfileCollection - also check StationProfile
  private class StandardSectionProfileFeature extends ProfileFeatureImpl {
    Cursor cursor;
    StructureData profileData;

    StandardSectionProfileFeature( Cursor cursor, double time, StructureData profileData) {
      super( ft.getFeatureName(cursor), StandardSectionCollectionImpl.this.getTimeUnit(), StandardSectionCollectionImpl.this.getAltUnits(),
              ft.getLatitude(cursor), ft.getLongitude(cursor), time, -1);


   /* StandardSectionProfileFeature(Cursor cursor, double time, StructureData profileData) {
      super( StandardSectionCollectionImpl.this.getTimeUnit().makeStandardDateString(time),
              StandardSectionCollectionImpl.this.getTimeUnit(), StandardSectionCollectionImpl.this.getAltUnits(),
              ft.getLatitude(cursor), ft.getLongitude(cursor), time, -1);  */

      this.cursor = cursor;
      this.profileData = profileData;

      if (Double.isNaN(time)) { // gotta read an obs to get the time
        try {
          PointFeatureIterator iter = getPointFeatureIterator(-1);
          if (iter.hasNext()) {
            PointFeature pf = iter.next();
            this.time = pf.getObservationTime();
            this.name = timeUnit.makeStandardDateString(this.time);
          } else {
            this.name = "empty";
          }
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }

    public PointFeatureIterator getPointFeatureIterator(int bufferSize) throws IOException {
      Cursor cursorIter = cursor.copy();
      StructureDataIterator siter = ft.getLeafFeatureDataIterator(cursorIter, bufferSize);
      StandardPointFeatureIterator iter = new StandardSectionProfileFeatureIterator(ft, timeUnit, siter, cursorIter);
      if ((boundingBox == null) || (dateRange == null) || (npts < 0))
        iter.setCalculateBounds(this);
      return iter;
    }

    @Override
    public Date getTime() {
      return timeUnit.makeDate(time);
    }

    @Override
    public StructureData getFeatureData() throws IOException {
      return profileData;
    }
  }

  private static class StandardSectionProfileFeatureIterator extends StandardPointFeatureIterator {

    StandardSectionProfileFeatureIterator(NestedTable ft, DateUnit timeUnit, StructureDataIterator structIter, Cursor cursor) throws IOException {
      super(ft, timeUnit, structIter, cursor);
    }

    @Override
    protected boolean isMissing() throws IOException {
      if (super.isMissing()) return true;
      // must also check for missing z values
      return ft.isAltMissing(this.cursor);
    }
  }

}




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