import java.io.File
import scala.xml.XML
import java.nio.file.Path
import java.nio.charset.Charset
import scala.xml.Node
import scala.xml.Attribute
import scala.xml.Elem
import scala.xml.Text
import scala.xml.PrettyPrinter
import scala.xml.TopScope

def matchy[A] = new Matchy[A] //hack for partial type application
class Matchy[A] { def apply[B](f: A => B) = f} //identity, but the parameter type is now specified

val pom = scala.xml.XML.loadFile("pom.xml")

var newExecution = pom\\"project"\\"build"\\"plugins"\\"plugin(1)"

/*

val original = {"V1_0"}
val replacaement = {"V1_3"}

def updateXML = matchy[Node] {
    case elem @ Elem(_, "plugin", _ , _, child @ _*)  if (elem \ "groupId").text == "org.jvnet.jaxb2.maven2" => addExecution(elem)
    case elem @ Elem(_, _, _, _, child @ _*) => elem.asInstanceOf[Elem].copy(child = child map updateXML)
    case other => other
}

def addExecution(node: Node): Node = node match {
    case elem @ Elem(_, "executions", _ , _, child @ _*) => elem.asInstanceOf[Elem].copy(child = (child ++ child(0)) ++ xml.XML.loadString( (child(1).toString).replaceAll("V1_0","V1_3").replaceAll("v1_0","v1_3") ))
    case elem @ Elem(_, _, _, _, child @ _*) => elem.asInstanceOf[Elem].copy(child = child map addExecution)
    case other => other
}

*/

def updateXML (node: Node): Node = node match {
    case elem @ Elem(_, "plugin", _ , _, child @ _*)  if (elem \ "groupId").text == "org.jvnet.jaxb2.maven2" => addExecution(elem)
    case elem @ Elem(_, _, _, _, child @ _*) => elem.asInstanceOf[Elem].copy(child = child map updateXML)
    case other => other
}

def addExecution(node: Node): Node = node match {
    case elem @ Elem(_, "executions", _ , _, child @ _*) => elem.asInstanceOf[Elem].copy(child = child ++ child(0) ++ replaceVersions(child(1)) ++ child(child.length - 1) )
    case elem @ Elem(_, _, _, _, child @ _*) => elem.asInstanceOf[Elem].copy(child = child map addExecution)
    case other => other
}

def replaceVersions = matchy[Node] {
    case elem @ Elem => xml.XML.loadString( (node.toString).replaceAll( original, replacement).replaceAll(original.toLowerCase,replacement.toLowerCase) )
    case other => other
}


println ( updateXML(pom) )