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package io.hireproof

import cats.data.Chain
import cats.syntax.all._

package object structure {
  type |*|[+A, +B] = (A, B)

  object |*| {
    def unapply[A, B](value: A |*| B): Some[A |*| B] = Some(value)
  }

  type |+|[+A, +B] = Either[A, B]

  object |+| {
    def unapply[A, B](value: A |+| B): Some[A |+| B] = Some(value)
  }

  private[structure] def collectAndRemoveFirst[A, B](
      chain: Chain[A]
  )(pf: PartialFunction[A, B]): (Chain[A], Option[B]) = {
    var result: Option[B] = none

    val filtered = chain.filter { a =>
      if (result.isEmpty && pf.isDefinedAt(a)) {
        result = pf.apply(a).some
        false
      } else true
    }

    (filtered, result)
  }
}