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package com.github.lwhite1.tablesaw.columns;

import com.github.lwhite1.tablesaw.api.LongColumn;
import com.github.lwhite1.tablesaw.filtering.LongBiPredicate;
import com.github.lwhite1.tablesaw.filtering.LongPredicate;
import it.unimi.dsi.fastutil.longs.LongIterable;

/**
 * Pre-made predicates for common integer use cases, and other helpful things
 */
public interface LongColumnUtils extends Column, LongIterable {

  LongPredicate isZero = i -> i == 0;

  LongPredicate isNegative = i -> i < 0;

  LongPredicate isPositive = i -> i > 0;

  LongPredicate isNonNegative = i -> i >= 0;

  LongPredicate isEven = i -> (i & 1) == 0;

  LongPredicate isOdd = i -> (i & 1) != 0;

  LongBiPredicate isGreaterThan = (valueToTest, valueToCompareAgainst) -> valueToTest > valueToCompareAgainst;

  LongBiPredicate isGreaterThanOrEqualTo = (valueToTest, valueToCompareAgainst) -> valueToTest >= valueToCompareAgainst;

  LongBiPredicate isLessThan = (valueToTest, valueToCompareAgainst) -> valueToTest < valueToCompareAgainst;

  LongBiPredicate isLessThanOrEqualTo = (valueToTest, valueToCompareAgainst) -> valueToTest <= valueToCompareAgainst;

  LongBiPredicate isEqualTo = (long valueToTest, long valueToCompareAgainst) -> valueToTest == valueToCompareAgainst;

  LongPredicate isMissing = i -> i == LongColumn.MISSING_VALUE;
  LongPredicate isNotMissing = i -> i != LongColumn.MISSING_VALUE;

}