#!groovy

/**
 * Checkouts and executes actions over a list of repositories.
 *
 * Manuele Simi (ISTI-CNR)
 */

def agent_root_folder = '/var/lib/jenkins/.m2'

//locate the action file
String actionURL = "https://code-repo.d4science.org/manuele.simi/gCubeActions/raw/branch/main/actions/${action_file}"
println "Querying ${actionURL}"

//save the action code
def action_code = actionURL.toURL().getText()

//TODO: get the list of repos from Jenkins?
//locate the repos file
String repoURL = "https://code-repo.d4science.org/manuele.simi/gCubeActions/raw/branch/main/repos/${repo_list}"
println "Querying ${repoURL}"

//save the action code
def repo_content = repoURL.toURL().getText()
def projects = parseProjectList(repo_content)


pipeline {

    agent {
        label 'CD'
    }

    environment {
        AGENT_ROOT_FOLDER = "${agent_root_folder}"
        PIPELINE_BUILD_NUMBER = "${env.BUILD_NUMBER}"
        ACTION_REPORT = "${agent_root_folder}/actions.${env.BUILD_NUMBER}.csv"
        BASH_FRAGMENT="${action_code}"
        REPO_ROOT="${repo_root}"

    }

    parameters {

        string(name: 'repo_root',
                defaultValue: 'https://code-repo.d4science.org/gCubeSystem/',
                description: 'The root URL of the repositories')
        string(name: 'repo_list',
                defaultValue: 'default_list.txt',
                description: 'The file with the list of repositories to update')
        string(name: 'action_file',
                defaultValue: '',
                description: 'The file with the Bash fragment to execute.')


    }

    stages {
        stage('initialize report') {
            steps {
                sh '''
                   date=`date`
                   echo "#Build ${PIPELINE_BUILD_NUMBER},," > $ACTION_REPORT
                   echo "#StartTime ${date},," >> $ACTION_REPORT
                   echo "Project,Repo,Result" >> $ACTION_REPORT
                   '''
            }
        }
        stage('clone and exec') {
            steps {
                script {
                    for (int i = 0; i < projects.size(); i++) {
                        stage(projects[i]) {
                            echo "About to execute over ${projects[i]}"
                            checkout_and_exec(projects[i], action_code)
                            sh "echo -e  ${projects[i]},'',Completed >> $ACTION_REPORT"
                        }
                    }
                }
            }
        }
    }

    // post-build actions
    post {
        always {
            script {
                sh '''
                  cp $ACTION_REPORT ./actions.${PIPELINE_BUILD_NUMBER}.csv
                  cat ./actions.${PIPELINE_BUILD_NUMBER}.csv
                  '''
            }
        }
        success {
            echo 'The actions pipeline worked!'

            emailext attachmentsPattern: "**/actions.${env.BUILD_NUMBER}.csv",
                    to: 'manuele.simi@isti.cnr.it',
                    subject: "Actions report(build #${PIPELINE_BUILD_NUMBER})",
                    body: "${currentBuild.fullDisplayName}. Build time: ${currentBuild.durationString}. See ${env.BUILD_URL}"
        }
        failure {
            echo 'The actions pipeline has failed'
            emailext attachLog: true,
                    to: 'manuele.simi@isti.cnr.it',
                    subject: "[Jenkins build D4S] build ${currentBuild.fullDisplayName} failed",
                    body: "Something is wrong with ${env.BUILD_URL}"
        }

    }
}


/**
 * Clones the repository and executes the fragment
 * NOTE:  'credentialsId' be manually configured in Jenkins to access all the repos
 */
def checkout_and_exec(repo_name, actions) {
    def repo_url = "${repo_root}/${repo_name}"
    sh(script: "rm -r ${repo_name} || true", returnStdout: true)?.trim()
    checkout([
            $class                           : 'GitSCM',
            branches                         : [[name: '*/master']],
            doGenerateSubmoduleConfigurations: false,
            extensions                       : [
                    [$class: 'RelativeTargetDirectory', relativeTargetDir: repo_name],
                    [$class: 'CloneOption', noTags: false, reference: '']
            ],
            submoduleCfg                     : [],
            userRemoteConfigs                : [
                    [credentialsId: '88b54962-1c0e-49cb-8155-22276860f346', url: repo_url] //git.gcube credentials on jenkins
            ]
    ])
    // just to show we can access the cloned repository
    get_last_commit(repo_name)

    //exec the action
    exec(actions, repo_url, repo_name)

}


String get_last_commit(repo_name) {
    String msg;
    dir(repo_name) {
        msg = sh(script: 'git rev-parse HEAD', returnStdout: true)?.trim()
    }
    return msg;
}
/**
  Execs the bash fragment
 */
def exec(actions, repo_url, repo_name) {

    dir(repo_name) {
        withCredentials([usernamePassword(credentialsId: '88b54962-1c0e-49cb-8155-22276860f346', passwordVariable: 'GIT_PASSWORD', usernameVariable: 'GIT_USERNAME')]) {
            def complete_url = "${repo_url}.git"
            def repository = complete_url.replaceFirst(".+://", "https://${GIT_USERNAME}:${GIT_PASSWORD}@")
            sh("""
            git remote set-url origin $repository
            git remote -v
            git config user.email "git.gcube@localhost"
            git config user.name "git.gcube"
            echo "${actions}" > actions.sh
            chmod a+x actions.sh
            source actions.sh
            rm actions.sh
            git push --force origin
            """)
        }
    }
}

//a non CPS method is necessary for the usage of splitEachLine()
@NonCPS
def parseProjectList(def text) {
    def projects = []
    text.readLines().each { project ->
        if (!project)
            return
        projects.add(project)
    }
    return projects
}