core/src/main/scala/com/rockymadden/stringmetric/phonetic/RefinedSoundexMetric.scala


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package com.rockymadden.stringmetric.phonetic

import com.rockymadden.stringmetric.Metric.StringMetric

case object RefinedSoundexMetric extends StringMetric[Boolean] {
	import com.rockymadden.stringmetric.Alphabet.Alpha

	override def compare(a: Array[Char], b: Array[Char]): Option[Boolean] =
		if (a.length == 0 || !(Alpha isSuperset a.head) || b.length == 0 || !(Alpha isSuperset b.head)) None
		else if (a.head.toLower != b.head.toLower) Some(false)
		else RefinedSoundexAlgorithm.compute(a).filter(_.length > 0).flatMap { rse1 =>
			RefinedSoundexAlgorithm.compute(b).filter(_.length > 0).map(rse1.sameElements(_))
		}

	override def compare(a: String, b: String): Option[Boolean] = compare(a.toCharArray, b.toCharArray)
}