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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.lucene.queries.function.valuesource;

import java.io.IOException;
import java.util.Map;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.docvalues.FloatDocValues;
import org.apache.lucene.search.IndexSearcher;

/**
 * RangeMapFloatFunction implements a map function over another {@link ValueSource}
 * whose values fall within min and max inclusive to target. 

 * Normally Used as an argument to a {@link org.apache.lucene.queries.function.FunctionQuery}
 */
public class RangeMapFloatFunction extends ValueSource {
  protected final ValueSource source;
  protected final float min;
  protected final float max;
  protected final ValueSource target;
  protected final ValueSource defaultVal;

  public RangeMapFloatFunction(ValueSource source, float min, float max, float target, Float def) {
    this(
        source,
        min,
        max,
        new ConstValueSource(target),
        def == null ? null : new ConstValueSource(def));
  }

  public RangeMapFloatFunction(
      ValueSource source, float min, float max, ValueSource target, ValueSource def) {
    this.source = source;
    this.min = min;
    this.max = max;
    this.target = target;
    this.defaultVal = def;
  }

  @Override
  public String description() {
    return "map("
        + source.description()
        + ","
        + min
        + ","
        + max
        + ","
        + target.description()
        + ","
        + (defaultVal == null ? "null" : defaultVal.description())
        + ")";
  }

  @Override
  public FunctionValues getValues(Map context, LeafReaderContext readerContext)
      throws IOException {
    final FunctionValues vals = source.getValues(context, readerContext);
    final FunctionValues targets = target.getValues(context, readerContext);
    final FunctionValues defaults =
        (this.defaultVal == null) ? null : defaultVal.getValues(context, readerContext);
    return new FloatDocValues(this) {
      @Override
      public float floatVal(int doc) throws IOException {
        float val = vals.floatVal(doc);
        return (val >= min && val <= max)
            ? targets.floatVal(doc)
            : (defaultVal == null ? val : defaults.floatVal(doc));
      }

      @Override
      public String toString(int doc) throws IOException {
        return "map("
            + vals.toString(doc)
            + ",min="
            + min
            + ",max="
            + max
            + ",target="
            + targets.toString(doc)
            + ",defaultVal="
            + (defaults == null ? "null" : (defaults.toString(doc)))
            + ")";
      }
    };
  }

  @Override
  public void createWeight(Map context, IndexSearcher searcher) throws IOException {
    source.createWeight(context, searcher);
  }

  @Override
  public int hashCode() {
    int h = source.hashCode();
    h ^= (h << 10) | (h >>> 23);
    h += Float.floatToIntBits(min);
    h ^= (h << 14) | (h >>> 19);
    h += Float.floatToIntBits(max);
    h += target.hashCode();
    if (defaultVal != null) {
      h += defaultVal.hashCode();
    }
    return h;
  }

  @Override
  public boolean equals(Object o) {
    if (RangeMapFloatFunction.class != o.getClass()) return false;
    RangeMapFloatFunction other = (RangeMapFloatFunction) o;
    return this.min == other.min
        && this.max == other.max
        && this.target.equals(other.target)
        && this.source.equals(other.source)
        && (this.defaultVal == other.defaultVal
            || (this.defaultVal != null && this.defaultVal.equals(other.defaultVal)));
  }
}