name: Publish Helm Chart

# Publishes the DeerFlow Helm chart as an OCI artifact to GHCR alongside the
# container images (see container.yaml). Triggers on the same `v*` tags.
#
# On pull requests touching the chart or config.example.yaml, `validate-chart`
# runs lint + template render + a config_version drift check (the chart's
# embedded config_version must not lag config.example.yaml) so a broken or
# stale chart fails the PR, not the release.
#
# Users then install with:
#   helm install deer-flow oci://ghcr.io/${{ owner }}/deer-flow --version <ver>

on:
  push:
    tags:
      - "v*"
  pull_request:
    paths:
      - "deploy/helm/deer-flow/**"
      - "config.example.yaml"
      - ".github/workflows/chart.yaml"

jobs:
  validate-chart:
    # Runs on PRs and release tags: catch a broken render or a stale
    # config_version before merge / publish. A broken chart published under a
    # vX.Y.Z tag is an immutable OCI artifact (GHCR won't let you overwrite
    # --version), so a regression must fail here, not on install.
    if: github.event_name == 'pull_request' || startsWith(github.ref, 'refs/tags/v')
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - name: Checkout repository
        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 #v6.0.3

      # ubuntu-latest ships with helm 3 preinstalled - no setup-helm action needed.
      - name: Lint chart
        run: helm lint deploy/helm/deer-flow
      - name: Validate templates render
        run: helm template deer-flow deploy/helm/deer-flow --include-crds >/dev/null

      # The chart's `config:` block embeds a config_version that must not fall
      # behind config.example.yaml. A stale version is silent in-cluster (the
      # image ships no example to compare against, so _check_config_version
      # never warns) but means the chart's config is authored against an older
      # schema. Bump it in values.yaml and the README example. config_version
      # gates no runtime behavior - it only drives the outdated-warning - so a
      # bare version bump needs no field changes.
      - name: config_version drift check
        run: |
          set -eu
          example=$(grep -E '^config_version:[[:space:]]+[0-9]+' config.example.yaml | head -1 | awk '{print $2}')
          chart=$(awk '/^config:[[:space:]]*\|/{f=1; next} f && /^[[:space:]]+config_version:[[:space:]]+[0-9]+/ {print $2; exit}' deploy/helm/deer-flow/values.yaml)
          echo "config.example.yaml config_version=$example"
          echo "chart values.yaml     config_version=$chart"
          if [ -z "$example" ] || [ -z "$chart" ]; then
            echo "::error::could not parse config_version from one of the files"
            exit 1
          fi
          if [ "$chart" -lt "$example" ]; then
            echo "::error::chart config_version ($chart) is behind config.example.yaml ($example). Bump 'config_version' in deploy/helm/deer-flow/values.yaml (and the README example) to $example."
            exit 1
          fi

  verify-versions:
    # Gate the release: every version source must match the v* tag. A forgotten
    # bump in Chart.yaml, pyproject.toml, or package.json fails here and skips
    # the publish. See scripts/verify_versions.sh.
    if: startsWith(github.ref, 'refs/tags/v')
    uses: ./.github/workflows/verify-versions.yml

  publish-chart:
    if: startsWith(github.ref, 'refs/tags/v')
    needs: [verify-versions, validate-chart]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 #v6.0.3

      - name: Log in to GHCR
        run: |
          echo "${{ secrets.GITHUB_TOKEN }}" | \
            helm registry login ghcr.io -u ${{ github.actor }} --password-stdin

      - name: Package chart
        run: helm package deploy/helm/deer-flow --destination ./packages

      - name: Push chart to GHCR
        run: |
          for pkg in ./packages/*.tgz; do
            echo "--- pushing $pkg"
            helm push "$pkg" oci://ghcr.io/${{ github.repository_owner }}
          done