package gs

import scala.util.matching.Regex

case class SemVer(
  major: Int,
  minor: Int,
  patch: Int
) {

  override def toString(): String =
    s"$major.$minor.$patch"

  def incrementPatch(): SemVer = copy(patch = this.patch + 1)
}

object SemVer {

  val SemVerPattern: Regex =
    "^(0|(?:[1-9][0-9]*))\\.(0|(?:[1-9][0-9]*))\\.(0|(?:[1-9][0-9]*))$".r

  def parse(candidate: String): Option[SemVer] =
    candidate match {
      case SemVerPattern(major, minor, patch) =>
        Some(SemVer(major.toInt, minor.toInt, patch.toInt))
      case _ =>
        None
    }

}