.gitlab-ci.yml

stages:
  - build
  - index
  - deploy

variables:
  GIT_SUBMODULE_STRATEGY: recursive
  GIT_SUBMODULE_UPDATE_FLAGS: --remote --merge
  LIBRARY_BRANCH: library

# Build the hydrogen-index tool from the submodule
build-indexer:
  stage: build
  image: golang:1.26
  script:
    - cd hydrogen-index
    - go build -o ../hydrogen-index-cli .
    - cd ..
  artifacts:
    paths:
      - hydrogen-index-cli
    expire_in: 1 hour

# Generate the index.json file with all artifact metadata
generate-index:
  stage: index
  image: golang:1.26
  needs:
    - build-indexer
  before_script:
    - apt update && apt install -y jq
  script:
    # Get the repository path in GitLab format (namespace/project)
    - REPO_PATH="${CI_PROJECT_PATH}"
    - echo "Repository path [${REPO_PATH}]"

    # Run hydrogen-index to scan artifacts and generate index.json
    # The tool will auto-detect the git root and scan for .h2drumkit, .h2pattern, .h2song files
    - ./hydrogen-index-cli scan \
        --provider gitlab \
        --repo "${REPO_PATH}" \
        --branch "${LIBRARY_BRANCH}" \
        --output index.json \
        --exclude hydrogen-index

    # Validate the generated index
    - ./hydrogen-index-cli validate index.json

    # Display summary
    - echo "Index generation complete. Summary:"
    - cat index.json | jq '{version, patternCount, songCount, drumkitCount, generatedAt}'
  artifacts:
    paths:
      - index.json
    expire_in: 1 hour

# Deploy the index.json to the library branch
deploy-index:
  stage: deploy
  image: alpine:latest
  needs:
    - generate-index
  before_script:
    # Install git and configure
    - apk add --no-cache git
    - git config --global user.email "$GITLAB_USER_EMAIL"
    - git config --global user.name "$GITLAB_USER_NAME"
  script:
    # Clone the repository with the library branch
    - git clone --depth 1 --branch "${LIBRARY_BRANCH}" "${CI_REPOSITORY_URL}" deploy-repo || git clone --depth 1 "${CI_REPOSITORY_URL}" deploy-repo
    - cd deploy-repo
    - git remote set-url origin "https://gitlab-ci-token:${CI_JOB_TOKEN}@${CI_SERVER_HOST}/${CI_PROJECT_PATH}.git"

    # If library branch doesn't exist, create it
    - git checkout "${LIBRARY_BRANCH}" 2>/dev/null || git checkout -b "${LIBRARY_BRANCH}"

    # Copy the generated index.json
    - cp ../index.json .

    # Commit and push the changes
    - git add index.json
    - git commit -m "Update index.json [skip ci]" || echo "No changes to commit"
    - git push origin "HEAD:${LIBRARY_BRANCH}"

    - echo "Index deployed to ${LIBRARY_BRANCH} branch"
    - echo "Permalink [${CI_PROJECT_URL}/-/raw/${LIBRARY_BRANCH}/index.json]"
  only:
    - main
    - master