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package com.browseengine.bobo.facets.data;

import it.unimi.dsi.fastutil.doubles.DoubleArrayList;

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

public class TermDoubleList extends TermNumberList {

  private double[] _elements = null;
  public static final double VALUE_MISSING = Double.MIN_VALUE;

  private static double parse(String s) {
    if (s == null || s.length() == 0) {
      return 0.0;
    } else {
      return Double.parseDouble(s);
    }
  }

  public TermDoubleList() {
    super();
  }

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

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

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

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

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

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

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

  public int indexOf(double val) {
    return Arrays.binarySearch(_elements, val);
  }

  @Override
  public void seal() {
    ((DoubleArrayList) _innerList).trim();
    _elements = ((DoubleArrayList) _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;
      }
      double 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(double val) {
    return Arrays.binarySearch(_elements, val) >= 0;
  }

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

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

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

  public int indexOfWithType(double val) {
    return Arrays.binarySearch(_elements, val);
  }

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