void tryAddKnownHost(String hostUrl){
    // ssh-keygen -F ${hostUrl} will fail (in bash that means status code != 0) if ${hostUrl} is not yet a known host
    def statusCode = sh script:"ssh-keygen -F ${hostUrl}", returnStatus:true
    if(statusCode != 0){
        sh "mkdir -p ~/.ssh"
        sh "ssh-keyscan ${hostUrl} >> ~/.ssh/known_hosts"
    }
}

pipeline {
    agent {
        docker { image 'pegasyseng/pantheon-build-jdk8:0.0.4' }
    }
    parameters {
        string(name: 'BRANCH_NAME', defaultValue: 'master', description: '[MANDATORY] The name of the branch to create the release from')
        string(name: 'RELEASE_VERSION', defaultValue: '', description: '[OPTIONAL] When empty: defaults to the current project version')
        string(name: 'NEXT_VERSION', defaultValue: '', description: '[OPTIONAL] When empty: defaults to next patch version after current project version')
    }

    stages {
        stage('Release') {
            steps {
                sshagent(
                    credentials: ['pegasys-admin-github-ssh-private-key']
                ) {
                    withCredentials([
                        usernamePassword(
                            credentialsId: 'pegasys-bintray',
                            usernameVariable: 'BINTRAY_USER',
                            passwordVariable: 'BINTRAY_KEY'
                        )
                    ]) {
                        withEnv([
                            'GIT_COMMITTER_NAME="PegaSys Admin"',
                            'GIT_COMMITTER_EMAIL="pegasys.manager@gmail.com"',
                            'GIT_AUTHOR_NAME="PegaSys Admin"',
                            'GIT_AUTHOR_EMAIL="pegasys.manager@gmail.com"'
                        ]) {
                            tryAddKnownHost('github.com')

                             script{
                                  releaseVersion = ''
                                  if( params.RELEASE_VERSION?.trim() ){
                                      releaseVersion = "-Prelease.releaseVersion=${params.RELEASE_VERSION}"
                                 }

                                  nextVersion = ''
                                  if( params.NEXT_VERSION?.trim() ){
                                      nextVersion = "-Prelease.newVersion=${params.NEXT_VERSION}"
                                  }
                              }


                            sh "./gradlew release -Prelease.useAutomaticVersion=true -Prelease.branch=${params.BRANCH_NAME} ${releaseVersion} ${nextVersion}"
                        }
                    }
                }
            }
        }
    }
}