pipeline {
  agent any

  options {
    timestamps()
    disableConcurrentBuilds()
  }

  environment {
    // ===== Registry =====
    REGISTRY_HOST     = "registry.pjt.kr"
    IMAGE_REPO        = "alist/api"
    DOCKER_CRED       = "registry-pjt"

    // ===== api ssh =====
    SSH_HOST          = "121.160.234.222"
    SSH_PORT          = "2001"
    SSH_USER          = "bigfuntnp"
    SSH_COMPOSE_DIR   = "/srv/project/alist/compose"
    SSH_COMPOSE_FILE  = "api-compose.pjt.yml"

    // ===== jenkins workspace path =====
    WORK_COMPOSE_DIR  = "deploy/pjt/compose"
    WORK_COMPOSE_FILE = "api-compose.pjt.yml"
  }

  stages {
    stage('1) Git check out') {
      steps {
        echo "[1/1] Git check out"

        checkout scm
      }
    }

    stage('2) Build (Gradle)') {
      steps {
        sh '''
          set -e

          echo "[1/1] Gradle build"

          chmod +x ./gradlew
          ./gradlew clean build -x test
        '''
      }
    }

    stage('3) ImageTag create') {
      steps {
        script {

          echo "[1/1] ImageTag create"

          env.SHORT_SHA = sh(script: "git rev-parse --short HEAD", returnStdout: true).trim()
          echo "SHORT_SHA = ${env.SHORT_SHA}"
          env.IMAGE_TAG = "${env.BUILD_NUMBER}-${env.SHORT_SHA}"
          echo "IMAGE_TAG = ${env.IMAGE_TAG}"
        }
      }
    }

    stage('4) Docker Build') {
      steps {
        sh '''
          set -e

          echo "[1/1] docker build"

          docker build -t ${REGISTRY_HOST}/${IMAGE_REPO}:${IMAGE_TAG} .
         '''
      }
    }

    stage('5) Docker registry Login & Push') {
      steps {
        withCredentials([usernamePassword(
          credentialsId: DOCKER_CRED,
          usernameVariable: 'DOCKER_USER',
          passwordVariable: 'DOCKER_PASS'
        )]) {
          sh '''
            set -e

            echo "[1/2] docker registry login"
            echo "$DOCKER_PASS" | docker login ${REGISTRY_HOST} \
              -u "$DOCKER_USER" --password-stdin

            echo "[2/2] docker image push"
            docker push ${REGISTRY_HOST}/${IMAGE_REPO}:${IMAGE_TAG}

            docker logout ${REGISTRY_HOST}
          '''
        }
      }
    }

    stage('6) Jenkins cleanup') {
      steps {
        sh '''
          set -e

          echo "[1/3] Remove pushed image from Jenkins"
          docker rmi ${REGISTRY_HOST}/${IMAGE_REPO}:${IMAGE_TAG} 2>/dev/null || true

          echo "[2/3] Remove dangling images"
          docker image prune -f

          echo "[3/3] Remove old build cache (safe-ish)"
          docker builder prune -f || true
        '''
      }
    }

    stage('7) Copy compose') {
      steps {
        sshagent(['ssh-pjt']) {
          sh '''
            set -e

            echo "[1/2] ssh login"

            SRC="${WORK_COMPOSE_DIR}/${WORK_COMPOSE_FILE}"
            DST="${SSH_USER}@${SSH_HOST}:${SSH_COMPOSE_DIR}/${SSH_COMPOSE_FILE}"

            echo "[2/2] Copy compose $SRC -> $DST"
            scp -P ${SSH_PORT} -o StrictHostKeyChecking=no "$SRC" "$DST"
          '''
        }
      }
    }

    stage('8) Remote docker registry login') {
      steps {
        sshagent(['ssh-pjt']) {
          withCredentials([usernamePassword(
            credentialsId: DOCKER_CRED,
            usernameVariable: 'DOCKER_USER',
            passwordVariable: 'DOCKER_PASS'
          )]) {
            sh '''
              set -e

              echo "[1/1] docker registry login"

              ssh -p ${SSH_PORT} \
                -o StrictHostKeyChecking=no \
                -o UserKnownHostsFile=/dev/null \
                ${SSH_USER}@${SSH_HOST} \
                'set -e
                 REGISTRY_HOST='"${REGISTRY_HOST}"'
                 DOCKER_USER='"${DOCKER_USER}"'
                 DOCKER_PASS='"${DOCKER_PASS}"'

                 echo "$DOCKER_PASS" | docker login "$REGISTRY_HOST" -u "$DOCKER_USER" --password-stdin
                '
            '''
          }
        }
      }
    }

    stage('9) Remote docker pull') {
      steps {
        sshagent(['ssh-pjt']) {
          sh '''
            set -e
            ssh -p ${SSH_PORT} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
              ${SSH_USER}@${SSH_HOST} \
              'set -e
               cd '"${SSH_COMPOSE_DIR}"'
               export IMAGE_TAG='"${IMAGE_TAG}"'

               echo "[1/1] docker pull"
               docker compose -p alist-api --env-file /srv/project/alist/env/api/.env -f '"${SSH_COMPOSE_FILE}"' pull
              '
          '''
        }
      }
    }

    stage('10) Remote docker down & up') {
      steps {
        sshagent(['ssh-pjt']) {
          sh '''
            set -e
            ssh -p ${SSH_PORT} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
              ${SSH_USER}@${SSH_HOST} \
              'set -e
               cd '"${SSH_COMPOSE_DIR}"'
               export IMAGE_TAG='"${IMAGE_TAG}"'

               echo "[1/3] docker down (remove orphans)"
               docker compose -p alist-api --env-file /srv/project/alist/env/api/.env -f "'"${SSH_COMPOSE_FILE}"'" down --remove-orphans

               echo "[2/3] docker up"
               docker compose -p alist-api --env-file /srv/project/alist/env/api/.env -f '"${SSH_COMPOSE_FILE}"' up -d

               echo "[3/3] docker ps"
               docker compose -p alist-api --env-file /srv/project/alist/env/api/.env -f '"${SSH_COMPOSE_FILE}"' ps
              '
          '''
        }
      }
    }

    stage('11) Remote cleanup') {
      steps {
        sshagent(['ssh-pjt']) {
          sh '''
            set -e
            ssh -p ${SSH_PORT} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
              ${SSH_USER}@${SSH_HOST} \
              'set -e

               echo "[0] Collect images used by running containers"
               RUNNING_IMAGES=$(docker ps -q | xargs -r docker inspect --format="{{.Image}}" | sort -u)

               echo "[1/3] Remove old registry images (except running ones)"
               docker images '"${REGISTRY_HOST}/${IMAGE_REPO}"' --format "{{.ID}} {{.CreatedAt}}" | \
                 sort -k2 -r | \
                 awk "{print \$1}" | \
                 while read IMAGE_ID; do
                   echo "$RUNNING_IMAGES" | grep -q "$IMAGE_ID" && continue
                   docker rmi -f "$IMAGE_ID" 2>/dev/null || true
                 done

               echo "[2/3] Remove dangling images (safe)"
               docker image prune -f

               echo "[3/3] Remove unused volumes (safe)"
               docker volume prune -f
              '
          '''
        }
      }
    }

    stage('12) Registry cleanup (keep last 5 + protect running)') {
      steps {
        withCredentials([usernamePassword(
          credentialsId: DOCKER_CRED,
          usernameVariable: 'DOCKER_USER',
          passwordVariable: 'DOCKER_PASS'
        )]) {
          sshagent(['ssh-pjt']) {
            sh '''
              set -e

              ssh -p ${SSH_PORT} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
                ${SSH_USER}@${SSH_HOST} \
                "REGISTRY_HOST='${REGISTRY_HOST}' IMAGE_REPO='${IMAGE_REPO}' DOCKER_USER='${DOCKER_USER}' DOCKER_PASS='${DOCKER_PASS}' bash -se" <<'EOF'
                  set -e

                  REGISTRY_URL="https://${REGISTRY_HOST}"
                  REPO="${IMAGE_REPO}"
                  KEEP=5
                  AUTH="${DOCKER_USER}:${DOCKER_PASS}"

                  command -v jq >/dev/null 2>&1 || (sudo apt-get update -y && sudo apt-get install -y jq)

                  echo "[1/6] Debug URL"
                  echo "REGISTRY_URL=${REGISTRY_URL}"
                  echo "TAGS_URL=${REGISTRY_URL}/v2/${REPO}/tags/list"

                  echo "[2/6] Collect running tags to protect"
                  RUNNING_TAGS=$(docker ps --format '{{.Image}}' | \
                    grep -E "^${REGISTRY_HOST}/${REPO}:" | \
                    awk -F: '{print $2}' | sort -u || true)

                  echo "[3/6] Fetch tags from registry"
                  TAGS=$(curl -fsS -u "${AUTH}" "${REGISTRY_URL}/v2/${REPO}/tags/list" | jq -r '.tags[]?' || true)

                  if [ -z "$TAGS" ]; then
                    echo "No tags found in registry. Skip."
                    exit 0
                  fi

                  echo "[4/6] Sort tags desc"
                  SORTED=$(echo "$TAGS" | sort -r)
                  KEEP_TAGS=$(echo "$SORTED" | head -n $KEEP)
                  DEL_CANDIDATES=$(echo "$SORTED" | tail -n +$((KEEP+1)))

                  echo "Keep tags:"
                  echo "$KEEP_TAGS" | sed 's/^/  - /'

                  echo "[5/6] Delete old tags except running tags"
                  for TAG in $DEL_CANDIDATES; do
                    if [ -n "$RUNNING_TAGS" ] && echo "$RUNNING_TAGS" | grep -qx "$TAG"; then
                      echo "Skip running tag: ${REPO}:${TAG}"
                      continue
                    fi

                    echo "Deleting ${REPO}:${TAG}"

                    DIGEST=$(curl -fsSI -u "${AUTH}" \
                      -H "Accept: application/vnd.docker.distribution.manifest.v2+json" \
                      "${REGISTRY_URL}/v2/${REPO}/manifests/${TAG}" \
                      | awk -F': ' '/Docker-Content-Digest/ {print $2}' | tr -d '\r')

                    if [ -z "$DIGEST" ]; then
                      echo "  digest not found. skip ${TAG}"
                      continue
                    fi

                    curl -fsS -u "${AUTH}" -X DELETE "${REGISTRY_URL}/v2/${REPO}/manifests/${DIGEST}" || true
                  done

                  echo "[6/6] Garbage collect (reclaim disk)"
                  docker exec registry registry garbage-collect /etc/docker/registry/config.yml

                  echo "Registry cleanup done."
    EOF
            '''
          }
        }
      }
    }


  }
}