# =============================================================================
# GitLab CI/CD Pipeline - PostgreSQL Container Factory
# =============================================================================
#
# Build de imagem PostgreSQL customizada em formato eStargz.
# Push para registry.kube.quest com lazy pulling habilitado.
#
# Requisitos:
#   - GitLab Runner com Docker-in-Docker (aula-11)
#   - BuildKit habilitado
#
# Uso:
#   1. Criar grupo 'factory' no GitLab
#   2. Criar projeto 'postgresql' dentro do grupo
#   3. Copiar Dockerfile, postgresql.conf e este .gitlab-ci.yml
#   4. Push para main - pipeline roda automaticamente
#
# =============================================================================

stages:
  - build
  - test
  - push

variables:
  # Registry do GitLab (aula-10)
  REGISTRY: ${CI_REGISTRY}
  IMAGE_NAME: ${CI_PROJECT_PATH}
  POSTGRES_VERSION: "17"

  # BuildKit para suporte a eStargz
  DOCKER_BUILDKIT: "1"
  BUILDKIT_PROGRESS: plain

  # Docker-in-Docker TLS connection
  DOCKER_HOST: tcp://docker:2376
  DOCKER_TLS_CERTDIR: "/certs"
  DOCKER_CERT_PATH: "/certs/client"
  DOCKER_TLS_VERIFY: "1"

# =============================================================================
# BUILD - Construir imagem em formato eStargz
# =============================================================================
build:
  stage: build
  image: docker:24
  services:
    - docker:24-dind
  before_script:
    # Aguardar Docker daemon estar pronto
    - until docker info; do sleep 1; done
    # Login no registry
    - docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD} ${CI_REGISTRY}
    # Configurar buildx com driver docker (usa daemon existente)
    - docker buildx create --name estargz-builder --driver docker --use || true
    - docker buildx inspect --bootstrap
  script:
    - echo "Building ${IMAGE_NAME}:${POSTGRES_VERSION}-${CI_COMMIT_SHA:0:8} with eStargz compression"
    # Build com formato eStargz
    - |
      docker buildx build \
        --output type=image,name=${REGISTRY}/${IMAGE_NAME}:${POSTGRES_VERSION}-${CI_COMMIT_SHA:0:8},push=true,compression=estargz,force-compression=true,oci-mediatypes=true \
        --label "org.opencontainers.image.revision=${CI_COMMIT_SHA}" \
        --label "org.opencontainers.image.created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
        --label "org.opencontainers.image.source=${CI_PROJECT_URL}" \
        --build-arg POSTGRES_VERSION=${POSTGRES_VERSION} \
        .
  rules:
    - if: $CI_COMMIT_BRANCH == "main"
    - if: $CI_COMMIT_TAG
  tags:
    - kubernetes
    - docker

# =============================================================================
# TEST - Testar imagem construída
# =============================================================================
test:
  stage: test
  image: docker:24
  services:
    - docker:24-dind
  before_script:
    - until docker info; do sleep 1; done
    - docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD} ${CI_REGISTRY}
  script:
    - echo "Testing PostgreSQL image..."

    # Iniciar container de teste
    - |
      docker run -d --name pg-test \
        -e POSTGRES_PASSWORD=testpassword \
        -e POSTGRES_DB=testdb \
        ${REGISTRY}/${IMAGE_NAME}:${POSTGRES_VERSION}-${CI_COMMIT_SHA:0:8}

    # Aguardar inicialização (30s max)
    - |
      for i in $(seq 1 30); do
        if docker exec pg-test pg_isready -U postgres -d testdb 2>/dev/null; then
          echo "PostgreSQL ready!"
          break
        fi
        echo "Waiting for PostgreSQL... ($i/30)"
        sleep 1
      done

    # Verificar healthcheck
    - docker exec pg-test pg_isready -U postgres -d testdb

    # Testar conexão e queries básicas
    - docker exec pg-test psql -U postgres -d testdb -c "SELECT version();"
    - docker exec pg-test psql -U postgres -d testdb -c "SHOW shared_buffers;"
    - docker exec pg-test psql -U postgres -d testdb -c "SHOW max_connections;"

    # Testar criação de tabela
    - docker exec pg-test psql -U postgres -d testdb -c "CREATE TABLE test (id serial PRIMARY KEY, name text);"
    - docker exec pg-test psql -U postgres -d testdb -c "INSERT INTO test (name) VALUES ('test');"
    - docker exec pg-test psql -U postgres -d testdb -c "SELECT * FROM test;"
    - docker exec pg-test psql -U postgres -d testdb -c "DROP TABLE test;"

    # Cleanup
    - docker stop pg-test && docker rm pg-test
    - echo "All tests passed!"
  needs:
    - build
  rules:
    - if: $CI_COMMIT_BRANCH == "main"
    - if: $CI_COMMIT_TAG
  tags:
    - kubernetes
    - docker

# =============================================================================
# PUSH - Tag como versão e latest
# =============================================================================
push:
  stage: push
  image: docker:24
  services:
    - docker:24-dind
  before_script:
    - until docker info; do sleep 1; done
    - docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD} ${CI_REGISTRY}
    - docker buildx create --name estargz-builder --driver docker --use || true
    - docker buildx inspect --bootstrap
  script:
    - echo "Tagging and pushing final images..."

    # Re-tag como versão (17)
    - |
      docker buildx build \
        --output type=image,name=${REGISTRY}/${IMAGE_NAME}:${POSTGRES_VERSION},push=true,compression=estargz,force-compression=true,oci-mediatypes=true \
        --label "org.opencontainers.image.revision=${CI_COMMIT_SHA}" \
        --label "org.opencontainers.image.created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
        .

    # Re-tag como latest
    - |
      docker buildx build \
        --output type=image,name=${REGISTRY}/${IMAGE_NAME}:latest,push=true,compression=estargz,force-compression=true,oci-mediatypes=true \
        --label "org.opencontainers.image.revision=${CI_COMMIT_SHA}" \
        --label "org.opencontainers.image.created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
        .

    # Build versão GZIP (para benchmark)
    - |
      docker buildx build \
        --output type=image,name=${REGISTRY}/${IMAGE_NAME}:${POSTGRES_VERSION}-gzip,push=true,compression=gzip,oci-mediatypes=true \
        --label "org.opencontainers.image.revision=${CI_COMMIT_SHA}" \
        --label "org.opencontainers.image.created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
        .

    - echo "Images pushed:"
    - echo "  - ${REGISTRY}/${IMAGE_NAME}:${POSTGRES_VERSION} (eStargz)"
    - echo "  - ${REGISTRY}/${IMAGE_NAME}:${POSTGRES_VERSION}-gzip (tradicional)"
    - echo "  - ${REGISTRY}/${IMAGE_NAME}:latest (eStargz)"
  needs:
    - test
  rules:
    - if: $CI_COMMIT_BRANCH == "main"
  tags:
    - kubernetes
    - docker