def IMAGE_BASE_NAME
def RELEASE_TAG_PREFIX
def REGISTRY_HOST

def resolveImageTag(env) {
    return env.TAG_NAME?.replace(RELEASE_TAG_PREFIX, '') ?: 'latest'
}

def resolveImageName(env) {
    return "${REGISTRY_HOST}/docker-base-images/${IMAGE_BASE_NAME}:${resolveImageTag(env)}"
}

pipeline {
    agent {
        docker {
            image 'alpine:3.17.3'
            // Mount docker socket for docker-in-docker
            args '-v /var/run/docker.sock:/var/run/docker.sock'
        }
    }
    stages {
        stage('prepare') {
            steps {
                sh "apk update && apk add --no-cache git"
                // Try to get tag name from git repo if it empty. By default this env fills only at tag builds in Jenkins
                script {
                    IMAGE_BASE_NAME = "jdk14-alpine"
                    RELEASE_TAG_PREFIX = "release-"
                    REGISTRY_HOST = "git.tswf.io"
                    if (env.TAG_NAME == null) {
                        env.TAG_NAME = sh(returnStdout: true, script: "git tag --points-at HEAD").trim()
                    }
                }
            }
        }
        stage('build_docker') {
            steps {
                sh "docker build . --tag ${resolveImageName(env)}"
            }
        }
        stage('push_docker') {
            when {
                tag "${RELEASE_TAG_PREFIX}*"
            }
            steps {
                sh "docker login ${REGISTRY_HOST} -u ${env.GITEA_USER} -p ${env.GITEA_OAUTH_TOKEN}"
                sh "docker image push ${resolveImageName(env)}"
            }
        }
    }
}