// See LICENSE for license details.

package firrtl
package annotations

import net.jcazevedo.moultingyaml._
import firrtl.annotations.AnnotationYamlProtocol._

case class AnnotationException(message: String) extends Exception(message)

final case class Annotation(target: Named, transform: Class[_ <: Transform], value: String) {
  val targetString: String = target.serialize
  val transformClass: String = transform.getName

  /**
    * This serialize is basically a pretty printer, actual serialization is handled by
    * AnnotationYamlProtocol
    * @return a nicer string than the raw case class default
    */
  def serialize: String = {
    s"Annotation(${target.serialize},${transform.getCanonicalName},$value)"
  }

  def update(tos: Seq[Named]): Seq[Annotation] = {
    check(target, tos, this)
    propagate(target, tos, duplicate)
  }
  def propagate(from: Named, tos: Seq[Named], dup: Named=>Annotation): Seq[Annotation] = tos.map(dup(_))
  def check(from: Named, tos: Seq[Named], which: Annotation): Unit = {}
  def duplicate(n: Named) = Annotation(n, transform, value)
}

object DeletedAnnotation {
  def apply(xFormName: String, anno: Annotation): Annotation =
    Annotation(anno.target, classOf[Transform], s"""DELETED by $xFormName\n${AnnotationUtils.toYaml(anno)}""")

  private val deletedRegex = """(?s)DELETED by ([^\n]*)\n(.*)""".r
  def unapply(a: Annotation): Option[(String, Annotation)] = a match {
    case Annotation(named, t, deletedRegex(xFormName, annoString)) if t == classOf[Transform] =>
      Some((xFormName, AnnotationUtils.fromYaml(annoString)))
    case _ => None
  }
}