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package io.circe

import scala.collection.mutable.Builder

private[circe] abstract class NonEmptySeqDecoder[A, C[_], S](decodeA: Decoder[A]) extends Decoder[S] { self =>
  protected def createBuilder(): Builder[A, C[A]]
  protected def create: (A, C[A]) => S
  private[this] final val decodeCA: Decoder[C[A]] = new SeqDecoder[A, C](decodeA) {
    protected final def createBuilder(): Builder[A, C[A]] = self.createBuilder()
  }

  final def apply(c: HCursor): Decoder.Result[S] = {
    val arr = c.downArray

    decodeA.tryDecode(arr) match {
      case Right(head) =>
        decodeCA.tryDecode(arr.delete) match {
          case Right(tail) => Right(create(head, tail))
          case l @ Left(_) => l.asInstanceOf[Decoder.Result[S]]
        }
      case l @ Left(_) => l.asInstanceOf[Decoder.Result[S]]
    }
  }

  final override def decodeAccumulating(c: HCursor): Decoder.AccumulatingResult[S] = {
    val arr = c.downArray

    Decoder.accumulatingResultInstance.map2(
      decodeA.tryDecodeAccumulating(arr),
      decodeCA.tryDecodeAccumulating(arr.delete)
    )(create)
  }
}