name: Chart Releases

on:
  workflow_dispatch:
  push:
    branches:
    - main
    paths:
    - 'charts/**'
    # tags:
    #   - "v*.*.*"

env:
  HELM_VERSION: 3.14.3

jobs:
  find-charts-to-release:
    runs-on: ubuntu-latest
    outputs:
      modified-charts-files: ${{ steps.list-changed-charts.outputs.all_modified_files }}
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Get list of changed charts
        id: list-changed-charts
        uses: tj-actions/changed-files@v44
        with:
          files: charts/*/Chart.yaml

  generate-charts-changelog:
    needs: find-charts-to-release
    if: needs.find-charts-to-release.outputs.modified-charts-files
    runs-on: ubuntu-latest
    container: quay.io/git-chglog/git-chglog:0.15.4
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Install main dependencies
        run: |
          apk add bash nodejs

      - name: Generate charts changelog files
        shell: bash
        run: |
          set -x
          apk add git grep yq

          # TODO: Bundle all of that logic in a Github Action to make it easy to share.
          for chart_file in ${{ needs.find-charts-to-release.outputs.modified-charts-files }}; do
              chart_name=$(grep -Po "(?<=^name: ).+" ${chart_file})
              chart_version=$(grep -Po "(?<=^version: ).+" ${chart_file})
              chart_tag="${chart_name}-${chart_version}"
              chart_path="charts/${chart_name}"

              #
              # Generate chart CHANGELOG.md file.
              git-chglog                                \
                  --output "${chart_path}/CHANGELOG.md" \
                  --tag-filter-pattern "${chart_name}"  \
                  --next-tag "${chart_tag}"             \
                  --path "${chart_path}"

              #
              # Generate RELEASE-NOTES.md file (used for Github release notes and ArtifactHub "changes" annotation).
              git-chglog                                    \
                  --output "${chart_path}/RELEASE-NOTES.md" \
                  --tag-filter-pattern "${chart_name}"      \
                  --next-tag "${chart_tag}"                 \
                  --path "${chart_path}" "${chart_tag}"

              #
              # Update ArtifactHub "changes" annotation in the Chart.yaml file.
              # https://artifacthub.io/docs/topics/annotations/helm/#supported-annotations
              change_types="Added Changed Deprecated Removed Fixed Security"

              # TODO: Rethink about this approach of using bash to generate YAML changes for ArtifactHub,
              # and find out if there is a better/cleaner way to make it.
              echo '|' > "${chart_path}/changes-for-artifacthub.yaml"
              for change_type in ${change_types}; do
                  change_type_section=$(sed -rn "/^\#+\s${change_type}/,/^(#|$)/p" "${chart_path}/RELEASE-NOTES.md")
                  if [[ -n "${change_type_section}" ]]; then
                      echo "${change_type_section}" | egrep '^-' | sed 's/^- //g' | while read commit_message; do
                          echo "  - kind: ${change_type,,}"
                          echo "    description: \"${commit_message}\""
                      done >> "${chart_path}/changes-for-artifacthub.yaml"
                  fi
              done

              cat "${chart_path}/changes-for-artifacthub.yaml"

              # Merge changes back to the Chart.yaml file.
              yq eval-all \
                  'select(fileIndex==0).annotations."artifacthub.io/changes" = select(fileIndex==1) | select(fileIndex==0)' \
                  ${chart_path}/Chart.yaml ${chart_path}/changes-for-artifacthub.yaml > \
                  ${chart_path}/Chart-with-artifacthub-changes.yaml

              mv ${chart_path}/Chart-with-artifacthub-changes.yaml ${chart_path}/Chart.yaml
          done

      - name: Stash generated charts changelog files
        uses: actions/upload-artifact@v3
        with:
          name: charts-generated-changelog
          path: |
            charts/*/RELEASE-NOTES.md
            charts/*/CHANGELOG.md
            charts/*/Chart.yaml

  release-charts:
    needs: generate-charts-changelog
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Unstash generated charts changelog files
        uses: actions/download-artifact@v3
        with:
          name: charts-generated-changelog
          path: charts

      - name: Configure Git
        run: |
          git config user.name "$GITHUB_ACTOR"
          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"

      - name: Install Helm
        uses: azure/setup-helm@v3
        with:
          version: "${{ env.HELM_VERSION }}"

      - name: Run Chart Releaser
        id: release_step
        uses: helm/chart-releaser-action@v1.6.0
        env:
          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
        with:
          config: .github/config/chart-releaser.yaml


  commit-charts-changelog:
    runs-on: ubuntu-latest
    needs:
      - find-charts-to-release
      - release-charts
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Unstash generated charts changelog files
        uses: actions/download-artifact@v3
        with:
          name: charts-generated-changelog
          path: charts

      - name: Commit charts CHANGELOG.md file
        run: |
          git config user.name "$GITHUB_ACTOR"
          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"

          released_charts_files="${{ needs.find-charts-to-release.outputs.modified-charts-files }}"
          echo "released_charts_files: ${released_charts_files}"

          # Commit changes locally.
          for chart_file in ${released_charts_files}; do
              chart_name=$(grep -Po "(?<=^name: ).+" ${chart_file})
              chart_version=$(grep -Po "(?<=^version: ).+" ${chart_file})
              chart_path="charts/${chart_name}"

              git add ${chart_path}/CHANGELOG.md
              git commit -m "Update CHANGELOG for chart ${chart_name} ${chart_version}"
          done

          # Push changes to the main branch.
          git push origin "${GITHUB_REF##*/}":main