name: lint-test-helm

on:
  pull_request:
    branches:
      - main
    paths:
      - 'clusters/cl01tl/helm/**'

  push:
    branches:
      - main
    paths:
      - 'clusters/cl01tl/helm/**'

env:
  CLUSTER: cl01tl
  BASE_BRANCH: "origin/${{ github.base_ref }}"

jobs:
  lint-helm:
    runs-on: ubuntu-js
    steps:
      - name: Checkout
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Check Branch Exists
        id: check-branch-exists
        if: github.event_name == 'pull_request'
        uses: GuillaumeFalourd/branch-exists@v1.1
        with:
          branch: ${{ github.base_ref }}

      - name: Report Branch Exists
        id: branch-exists
        if: github.event_name == 'push' || steps.check-branch-exists.outputs.exists == 'true' && github.event_name == 'pull_request'
        run: |
          if [ "${{ github.event_name }}" == "push" ]; then
            echo ">> Action is from a push event, will continue with linting"

          else
            echo ">> Branch ${{ github.base_ref }} exists, will continue with linting"

          fi

          echo ""
          echo "----"

          echo "exists=true" >> $GITHUB_OUTPUT

      - name: Set Up Helm
        if: steps.branch-exists.outputs.exists == 'true'
        uses: azure/setup-helm@v4
        with:
          token: ${{ secrets.GITEA_TOKEN }}
          version: v3.19.2
          cache: true

      - name: Cache Helm Dependencies
        if: steps.branch-exists.outputs.exists == 'true'
        uses: actions/cache@v5
        with:
          path: |
            ~/.cache/helm
            ~/.config/helm
          key: helm-cache-${{ runner.os }}-${{ hashFiles('infrastructure/clusters/cl01tl/helm/**/Chart.yaml', 'infrastructure/clusters/cl01tl/helm/**/Chart.lock') }}
          restore-keys: |
            helm-cache-${{ runner.os }}-

      - name: Check Directories for Changes
        id: check-dir-changes
        if: steps.branch-exists.outputs.exists == 'true'
        run: |
          echo ">> Target branch for diff is: ${BASE_BRANCH}"

          if [ "${{ github.event_name }}" == "pull_request" ]; then
            DIFF_TARGET="${BASE_BRANCH}"
            echo ""
            echo ">> Checking for changes in a pull request ..."

          else
            DIFF_TARGET="${{ github.event.before }}..HEAD"
            echo ""
            echo ">> Checking for changes from a push ..."

          fi

          CHANGED_CHARTS=$(git diff --name-only "${DIFF_TARGET}" | grep -E "^clusters/${CLUSTER}/helm/" | awk -F '/' '{print $4}' | sort -u || true)

          if [ -n "${CHANGED_CHARTS}" ]; then
            echo ""
            echo ">> Chart to Lint:"
            echo ""
            echo "${CHANGED_CHARTS}"

            CHANGED_CHARTS_CSV=$(echo "$CHANGED_CHARTS" | paste -sd ',' -)

            echo ""
            echo "----"

            echo "changes-detected=true" >> $GITHUB_OUTPUT
            echo "chart-dir-csv=${CHANGED_CHARTS_CSV}" >> $GITHUB_OUTPUT
            echo "chart-dir<<EOF" >> $GITHUB_OUTPUT
            echo "${CHANGED_CHARTS}" >> $GITHUB_OUTPUT
            echo "EOF" >> $GITHUB_OUTPUT

          else
            echo ""
            echo ">> Did not find any helm charts files to lint"

            echo ""
            echo "----"

            echo "changes-detected=false" >> $GITHUB_OUTPUT

          fi

      - name: Add Repositories
        if: steps.check-dir-changes.outputs.changes-detected == 'true'
        env:
          CHANGED_CHARTS: ${{ steps.check-dir-changes.outputs.chart-dir }}
        run: |
          echo ">> Adding repositories for chart dependencies ..."
          echo ""

          for DIR in ${CHANGED_CHARTS}; do
            helm dependency list --max-col-width 120 clusters/${CLUSTER}/helm/${DIR} 2> /dev/null \
              | tail -n +2 \
              | awk 'NF > 0 { print $1, $3 }' \
              | while read -r REPO_NAME REPO_URL; do
                if [[ "${REPO_URL}" == oci://* ]]; then
                  echo ">> Ignoring OCI repo: ${REPO_URL}"

                elif [[ -n "${REPO_NAME}" && -n "${REPO_URL}" ]]; then
                  helm repo add "${REPO_NAME}" "${REPO_URL}"

                fi

              done || true
          done

          if helm repo list > /dev/null 2>&1; then
            echo ""
            echo ">> Update repository cache ..."
            helm repo update

          fi

          echo ""
          echo "----"

      - name: Lint Helm Chart
        if: steps.check-dir-changes.outputs.changes-detected == 'true'
        env:
          CHANGED_CHARTS: ${{ steps.check-dir-changes.outputs.chart-dir }}
        run: |
          EXIT_CODE=0

          echo ">> Running linting on changed charts ..."

          for DIR in ${CHANGED_CHARTS}; do
            CHART_PATH="clusters/${CLUSTER}/helm/${DIR}"
            CHART_NAME=$(basename "${CHART_PATH}")

            if [ -f "${CHART_PATH}/Chart.yaml" ]; then
              echo ""
              echo ">> Building helm dependency for ${CHART_NAME} ..."
              helm dependency build "${CHART_PATH}" --skip-refresh

              echo ""
              echo ">> Linting helm chart ${CHART_NAME} ..."
              helm lint "${CHART_PATH}" --namespace "default" || EXIT_CODE=1

            else
              echo ""
              echo ">> Directory ${CHART_PATH} does not contain a Chart.yaml. Skipping ..."

            fi

          done

          echo ""
          echo "----"

          exit $EXIT_CODE

      - name: ntfy Failed
        uses: niniyas/ntfy-action@master
        if: failure()
        with:
          url: '${{ secrets.NTFY_URL }}'
          topic: '${{ secrets.NTFY_TOPIC }}'
          title: 'Helm Test Failure'
          priority: 3
          headers: '{"Authorization": "Bearer ${{ secrets.NTFY_CRED }}"}'
          tags: action,failed
          details: "Helm linting for cluster '${CLUSTER}' with charts: ${{ steps.check-dir-changes.outputs.chart-dir-csv }}"
          icon: 'https://cdn.jsdelivr.net/gh/selfhst/icons/png/gitea.png'
          actions: '[{"action": "view", "label": "Open Gitea", "url": "https://gitea.alexlebens.dev/alexlebens/infrastructure/actions?workflow=lint-test-helm.yaml", "clear": true}]'
          image: true