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package com.browseengine.bobo.facets.impl;

import it.unimi.dsi.fastutil.floats.FloatArrayList;
import it.unimi.dsi.fastutil.floats.FloatList;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import org.apache.lucene.index.Term;
import org.apache.lucene.search.Explanation;

import com.browseengine.bobo.api.BoboSegmentReader;
import com.browseengine.bobo.api.BoboSegmentReader.WorkArea;
import com.browseengine.bobo.api.BrowseSelection;
import com.browseengine.bobo.api.FacetSpec;
import com.browseengine.bobo.facets.FacetCountCollector;
import com.browseengine.bobo.facets.FacetCountCollectorSource;
import com.browseengine.bobo.facets.FacetHandler;
import com.browseengine.bobo.facets.data.MultiValueFacetDataCache;
import com.browseengine.bobo.facets.data.TermListFactory;
import com.browseengine.bobo.facets.filter.AdaptiveFacetFilter;
import com.browseengine.bobo.facets.filter.EmptyFilter;
import com.browseengine.bobo.facets.filter.MultiValueFacetFilter;
import com.browseengine.bobo.facets.filter.MultiValueORFacetFilter;
import com.browseengine.bobo.facets.filter.RandomAccessAndFilter;
import com.browseengine.bobo.facets.filter.RandomAccessFilter;
import com.browseengine.bobo.facets.filter.RandomAccessNotFilter;
import com.browseengine.bobo.facets.range.MultiDataCacheBuilder;
import com.browseengine.bobo.facets.range.SimpleDataCacheBuilder;
import com.browseengine.bobo.query.scoring.BoboDocScorer;
import com.browseengine.bobo.query.scoring.FacetScoreable;
import com.browseengine.bobo.query.scoring.FacetTermScoringFunctionFactory;
import com.browseengine.bobo.sort.DocComparatorSource;
import com.browseengine.bobo.util.BigIntArray;
import com.browseengine.bobo.util.BigNestedIntArray;

public class MultiValueFacetHandler extends FacetHandler> implements
    FacetScoreable {
  @SuppressWarnings("rawtypes")
  protected final TermListFactory _termListFactory;
  protected final String _indexFieldName;

  protected int _maxItems = BigNestedIntArray.MAX_ITEMS;
  protected Term _sizePayloadTerm;
  protected Set _depends;

  public MultiValueFacetHandler(String name, String indexFieldName,
      TermListFactory termListFactory, Term sizePayloadTerm, Set depends) {
    super(name, depends);
    _depends = depends;
    _indexFieldName = (indexFieldName != null ? indexFieldName : name);
    _termListFactory = termListFactory;
    _sizePayloadTerm = sizePayloadTerm;
  }

  @Override
  public int getNumItems(BoboSegmentReader reader, int id) {
    MultiValueFacetDataCache data = getFacetData(reader);
    if (data == null) return 0;
    return data.getNumItems(id);
  }

  public MultiValueFacetHandler(String name, String indexFieldName,
      TermListFactory termListFactory, Term sizePayloadTerm) {
    this(name, indexFieldName, termListFactory, sizePayloadTerm, null);
  }

  public MultiValueFacetHandler(String name, TermListFactory termListFactory,
      Term sizePayloadTerm) {
    this(name, name, termListFactory, sizePayloadTerm, null);
  }

  public MultiValueFacetHandler(String name, String indexFieldName,
      TermListFactory termListFactory) {
    this(name, indexFieldName, termListFactory, null, null);
  }

  public MultiValueFacetHandler(String name, TermListFactory termListFactory) {
    this(name, name, termListFactory);
  }

  public MultiValueFacetHandler(String name, String indexFieldName) {
    this(name, indexFieldName, null);
  }

  public MultiValueFacetHandler(String name) {
    this(name, name, null);
  }

  public MultiValueFacetHandler(String name, Set depends) {
    this(name, name, null, null, depends);
  }

  @Override
  public DocComparatorSource getDocComparatorSource() {
    return new MultiValueFacetDataCache.MultiFacetDocComparatorSource(new MultiDataCacheBuilder(
        getName(), _indexFieldName));
  }

  public void setMaxItems(int maxItems) {
    _maxItems = Math.min(maxItems, BigNestedIntArray.MAX_ITEMS);
  }

  @Override
  public String[] getFieldValues(BoboSegmentReader reader, int id) {
    MultiValueFacetDataCache dataCache = getFacetData(reader);
    if (dataCache != null) {
      return dataCache._nestedArray.getTranslatedData(id, dataCache.valArray);
    }
    return new String[0];
  }

  @Override
  public Object[] getRawFieldValues(BoboSegmentReader reader, int id) {

    MultiValueFacetDataCache dataCache = getFacetData(reader);
    if (dataCache != null) {
      return dataCache._nestedArray.getRawData(id, dataCache.valArray);
    }
    return new String[0];
  }

  @Override
  public FacetCountCollectorSource getFacetCountCollectorSource(final BrowseSelection sel,
      final FacetSpec ospec) {
    return new FacetCountCollectorSource() {

      @Override
      public FacetCountCollector getFacetCountCollector(BoboSegmentReader reader, int docBase) {
        MultiValueFacetDataCache dataCache = MultiValueFacetHandler.this.getFacetData(reader);
        return new MultiValueFacetCountCollector(_name, dataCache, docBase, sel, ospec);
      }
    };

  }

  @Override
  public MultiValueFacetDataCache load(BoboSegmentReader reader) throws IOException {
    return load(reader, new WorkArea());
  }

  @SuppressWarnings("unchecked")
  @Override
  public MultiValueFacetDataCache load(BoboSegmentReader reader, WorkArea workArea)
      throws IOException {
    @SuppressWarnings("rawtypes")
    MultiValueFacetDataCache dataCache = new MultiValueFacetDataCache();

    dataCache.setMaxItems(_maxItems);

    if (_sizePayloadTerm == null) {
      dataCache.load(_indexFieldName, reader, _termListFactory, workArea);
    } else {
      dataCache.load(_indexFieldName, reader, _termListFactory, _sizePayloadTerm);
    }
    return dataCache;
  }

  @Override
  public RandomAccessFilter buildRandomAccessFilter(String value, Properties prop)
      throws IOException {
    MultiValueFacetFilter f = new MultiValueFacetFilter(new MultiDataCacheBuilder(getName(),
        _indexFieldName), value);
    AdaptiveFacetFilter af = new AdaptiveFacetFilter(new SimpleDataCacheBuilder(getName(),
        _indexFieldName), f, new String[] { value }, false);
    return af;
  }

  @Override
  public RandomAccessFilter buildRandomAccessAndFilter(String[] vals, Properties prop)
      throws IOException {

    ArrayList filterList = new ArrayList(vals.length);

    for (String val : vals) {
      RandomAccessFilter f = buildRandomAccessFilter(val, prop);
      if (f != null) {
        filterList.add(f);
      } else {
        return EmptyFilter.getInstance();
      }
    }
    if (filterList.size() == 1) return filterList.get(0);
    return new RandomAccessAndFilter(filterList);
  }

  @Override
  public RandomAccessFilter buildRandomAccessOrFilter(String[] vals, Properties prop, boolean isNot)
      throws IOException {
    RandomAccessFilter filter = null;
    if (vals.length > 1) {
      MultiValueORFacetFilter f = new MultiValueORFacetFilter(this, vals, false); // catch the "not"
                                                                                  // case later
      if (!isNot) {
        AdaptiveFacetFilter af = new AdaptiveFacetFilter(new SimpleDataCacheBuilder(getName(),
            _indexFieldName), f, vals, false);
        return af;
      } else {
        filter = f;
      }
    } else if (vals.length == 1) {
      filter = buildRandomAccessFilter(vals[0], prop);
    } else {
      filter = EmptyFilter.getInstance();
    }

    if (isNot) {
      filter = new RandomAccessNotFilter(filter);
    }
    return filter;
  }

  @Override
  public BoboDocScorer getDocScorer(BoboSegmentReader reader,
      FacetTermScoringFunctionFactory scoringFunctionFactory, Map boostMap) {
    MultiValueFacetDataCache dataCache = getFacetData(reader);
    float[] boostList = BoboDocScorer.buildBoostList(dataCache.valArray, boostMap);
    return new MultiValueDocScorer(dataCache, scoringFunctionFactory, boostList);
  }

  public static final class MultiValueDocScorer extends BoboDocScorer {
    private final MultiValueFacetDataCache _dataCache;
    private final BigNestedIntArray _array;

    public MultiValueDocScorer(MultiValueFacetDataCache dataCache,
        FacetTermScoringFunctionFactory scoreFunctionFactory, float[] boostList) {
      super(scoreFunctionFactory.getFacetTermScoringFunction(dataCache.valArray.size(),
        dataCache._nestedArray.size()), boostList);
      _dataCache = dataCache;
      _array = _dataCache._nestedArray;
    }

    @Override
    public Explanation explain(int doc) {
      String[] vals = _array.getTranslatedData(doc, _dataCache.valArray);

      FloatList scoreList = new FloatArrayList(_dataCache.valArray.size());
      ArrayList explList = new ArrayList(scoreList.size());
      for (String val : vals) {
        int idx = _dataCache.valArray.indexOf(val);
        if (idx >= 0) {
          scoreList.add(_function.score(_dataCache.freqs[idx], _boostList[idx]));
          explList.add(_function.explain(_dataCache.freqs[idx], _boostList[idx]));
        }
      }
      Explanation topLevel = _function.explain(scoreList.toFloatArray());
      for (Explanation sub : explList) {
        topLevel.addDetail(sub);
      }
      return topLevel;
    }

    @Override
    public final float score(int docid) {
      return _array.getScores(docid, _dataCache.freqs, _boostList, _function);
    }

  }

  public static final class MultiValueFacetCountCollector extends DefaultFacetCountCollector {
    public final BigNestedIntArray _array;

    MultiValueFacetCountCollector(String name, MultiValueFacetDataCache dataCache, int docBase,
        BrowseSelection sel, FacetSpec ospec) {
      super(name, dataCache, docBase, sel, ospec);
      _array = dataCache._nestedArray;
    }

    @Override
    public final void collect(int docid) {
      _array.countNoReturn(docid, _count);
    }

    @Override
    public final void collectAll() {
      _count = BigIntArray.fromArray(_dataCache.freqs);
    }
  }
}