package utils

class LinkedIssueTransitions {

  static String findSingleLinkedTargetKey(Map issueJson,
                                         String linkTypeName,
                                         String targetProjectKey) {
    def links = (issueJson?.fields?.issuelinks ?: []) as List
    if (!links) return null

    String prefix = "${targetProjectKey}-"
    def targets = [] as List<String>

    links.each { l ->
      def inwardName  = l?.type?.inward?.toString()
      def outwardName = l?.type?.outward?.toString()

      if (inwardName == linkTypeName && l?.inwardIssue?.key) {
        def k = l.inwardIssue.key.toString()
        if (k.startsWith(prefix)) targets << k
      }
      if (outwardName == linkTypeName && l?.outwardIssue?.key) {
        def k = l.outwardIssue.key.toString()
        if (k.startsWith(prefix)) targets << k
      }
    }

    targets = targets.unique()
    if (targets.size() != 1) return null

    return targets[0]
  }
}