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package com.browseengine.bobo.facets.data;

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

import java.text.DecimalFormat;
import java.util.Arrays;
import java.util.List;

public class TermFloatList extends TermNumberList {

  private float[] _elements = null;
  public static final float VALUE_MISSING = Float.MIN_VALUE;

  private static float parse(String s) {
    if (s == null || s.length() == 0) {
      return 0.0f;
    } else {
      return Float.parseFloat(s);
    }
  }

  public TermFloatList() {
    super();
  }

  public TermFloatList(String formatString) {
    super(formatString);
  }

  public TermFloatList(int capacity, String formatString) {
    super(capacity, formatString);
  }

  @Override
  public boolean add(String o) {
    return ((FloatArrayList) _innerList).add(parse(o));
  }

  @Override
  protected List buildPrimitiveList(int capacity) {
    _type = Float.class;
    return capacity > 0 ? new FloatArrayList(capacity) : new FloatArrayList();
  }

  @Override
  public String get(int index) {
    DecimalFormat formatter = _formatter.get();
    if (formatter == null) return String.valueOf(_elements[index]);
    return formatter.format(_elements[index]);
  }

  public float getPrimitiveValue(int index) {
    if (index < _elements.length) return _elements[index];
    else return VALUE_MISSING;
  }

  @Override
  public int indexOf(Object o) {
    float val;
    if (o instanceof String) val = parse((String) o);
    else val = (Float) o;
    float[] elements = ((FloatArrayList) _innerList).elements();
    return Arrays.binarySearch(elements, val);
  }

  public int indexOf(float o) {
    return Arrays.binarySearch(_elements, o);
  }

  @Override
  public void seal() {
    ((FloatArrayList) _innerList).trim();
    _elements = ((FloatArrayList) _innerList).elements();
    int negativeIndexCheck = 1;
    // reverse negative elements, because string order and numeric orders are completely opposite
    if (_elements.length > negativeIndexCheck && _elements[negativeIndexCheck] < 0) {
      int endPosition = indexOfWithType((short) 0);
      if (endPosition < 0) {
        endPosition = -1 * endPosition - 1;
      }
      float tmp;
      for (int i = 0; i < (endPosition - negativeIndexCheck) / 2; i++) {
        tmp = _elements[i + negativeIndexCheck];
        _elements[i + negativeIndexCheck] = _elements[endPosition - i - 1];
        _elements[endPosition - i - 1] = tmp;
      }
    }
  }

  @Override
  protected Object parseString(String o) {
    return parse(o);
  }

  public boolean contains(float val) {
    return Arrays.binarySearch(_elements, val) >= 0;
  }

  @Override
  public boolean containsWithType(Float val) {
    return Arrays.binarySearch(_elements, val) >= 0;
  }

  public boolean containsWithType(float val) {
    return Arrays.binarySearch(_elements, val) >= 0;
  }

  @Override
  public int indexOfWithType(Float o) {
    return Arrays.binarySearch(_elements, o);
  }

  public int indexOfWithType(float o) {
    return Arrays.binarySearch(_elements, o);
  }

  @Override
  public double getDoubleValue(int index) {
    return _elements[index];
  }
}