name: Publish Opik Helm Chart
run-name: "Publish Opik Helm Chart ${{ github.ref_name }} by @${{ github.actor }}"

on:
  workflow_dispatch:
    inputs:
      version:
        type: string
        required: true
        description: Version
        default: ""
  workflow_call:
    inputs:
      version:
        type: string
        required: true
        description: Version


jobs:

  publish-helm-chart:
    # TODO(OPIK-6617): Add a preflight check that verifies the runner can push to the
    # `gh-pages` branch (e.g. `git ls-remote --exit-code` with the same credentials)
    # so a missing/expired GH token fails fast instead of after `helm package`.
    # See .github/actions/npm-token-preflight for the pattern.

    runs-on: ubuntu-latest
    timeout-minutes: 15
    env:
      VERSION: ${{inputs.version}}
    steps:

        - name: Install Helm
          # azure/setup-helm v4.3.1 pinned to commit SHA 1a275c3b69536ee54be43f2070a358922e12c8d4
          # Source: https://github.com/Azure/setup-helm/releases/tag/v4.3.1
          uses: azure/setup-helm@1a275c3b69536ee54be43f2070a358922e12c8d4
          with:
            version: v3.19.4

        - name: Validate version input
          shell: bash
          run: |
            set -e
            # Validate version input to prevent command injection
            if ! echo "$VERSION" | grep -qE '^v?[0-9]+\.[0-9]+\.[0-9]+(-[A-Za-z0-9.-]+)?(\+[A-Za-z0-9.-]+)?$'; then
              echo "ERROR: Invalid version format: $VERSION"
              echo "Expected SemVer format (e.g., v1.2.3, 1.2.3-alpha, 1.2.3+build)"
              exit 1
            fi
            echo "Version validated: $VERSION"

        - name: Checkout
          uses: actions/checkout@v6
          with:
            ref: ${{inputs.version}}
            fetch-tags: true
            path: 'src'
            fetch-depth: 0

        - name: Checkout GH Pages branch
          uses: actions/checkout@v6
          with:
            path: 'dest'
            ref: 'gh-pages'
            fetch-depth: 0

        - name: Run lint on Helm chart
          shell: bash
          working-directory: src
          run: |
            set -e
            cd deployment/helm_chart/opik
            helm repo add mysql https://comet-ml.github.io/comet-mysql-helm/
            helm repo add clickhouse-operator https://docs.altinity.com/clickhouse-operator
            helm dependency build
            helm lint --values values.yaml .
            cd -

        - name: Package helm chart
          shell: bash
          working-directory: src
          run: |
            set -e
            cd deployment/helm_chart
            helm package --version "$VERSION" --app-version "$VERSION" opik/ -u -d ../../../dest
            cd -
            echo "Copy updated README"
            cp deployment/helm_chart/opik/README.md ../dest/.

        - name: Restore file timestamps from git history
          shell: bash
          working-directory: dest
          run: |
            set -e
            # Set file modification times based on git commit history
            # This is important because helm repo index uses file mtime to set the 'created' field
            
            # 1. Set timestamp for the newly packaged chart from source repo tag
            NEW_CHART_FILE="opik-${VERSION}.tgz"
            if [ -f "$NEW_CHART_FILE" ]; then
              NEW_CHART_TIME=$(cd ../src && git log -1 --format="%cI" "$VERSION") || NEW_CHART_TIME=""
              if [ -n "$NEW_CHART_TIME" ]; then
                touch -d "$NEW_CHART_TIME" "$NEW_CHART_FILE"
                echo "Set $NEW_CHART_FILE mtime to $NEW_CHART_TIME (from source tag)"
              fi
            fi
            
            # 2. Restore timestamps for existing files from gh-pages git history
            echo "Restoring file timestamps from git history..."
            git ls-files -z | while read -r -d $'\0' file; do
              if [ -f "$file" ]; then
                TIME=$(git log -1 --format="%cI" -- "$file")
                if [ -n "$TIME" ]; then
                  touch -d "$TIME" "$file"
                  echo "Set $file mtime to $TIME"
                fi
              fi
            done
            echo "File timestamps restored."

        - name: Push New Files
          shell: bash
          working-directory: dest
          env:
            INDEX_FILE: index.yaml
          run: |
            set -e
            # Run helm repo index which will overwrite created timestamps
            helm repo index . --url https://raw.githubusercontent.com/comet-ml/opik/gh-pages/ --merge "${INDEX_FILE}"
            
            # Fix timestamps again - helm repo index overwrites them based on file mtime
            echo "=== Fixing timestamps based on file modification times ==="
            CHARTS=$(yq eval '.entries[] | .[] | .urls[0]' "${INDEX_FILE}")
            
            for CHART_URL in $CHARTS; do
                FILENAME=$(basename "$CHART_URL")
                
                if [ -f "$FILENAME" ]; then
                    MTIME=$(date -u -r "$FILENAME" +"%Y-%m-%dT%H:%M:%SZ")
                    echo "Setting $FILENAME timestamp to $MTIME"
                    yq eval "(.entries[][] | select(.urls[0] == \"$CHART_URL\") | .created) = \"$MTIME\"" -i --indent 2 "${INDEX_FILE}"
                fi
            done
            
            git config user.name "Helm Updater"
            git config user.email "actions@users.noreply.github.com"
            git ls-files -o --exclude-standard -z | xargs -0 -r git add
            git add "${INDEX_FILE}" README.md
            if git diff --staged --quiet; then
              echo "::warning title=helm publish::No changes to commit; chart ${VERSION} is already up to date in gh-pages."
            else
              git commit -m "Release Opik helm chart $VERSION"
              git push
            fi

        - name: Summary
          run: |
            echo "Helm chart is published, version is : $VERSION" >> "$GITHUB_STEP_SUMMARY"