name: Rollback

on:
  workflow_dispatch:
    inputs:
      version:
        description: "Version to move npm latest and Docker latest to (example: 1.4.2)"
        required: true
        type: string

permissions:
  contents: write

concurrency:
  group: rollback-latest-${{ github.event.inputs.version }}
  cancel-in-progress: false

jobs:
  rollback:
    name: Roll back npm, Docker, and GitHub release latest
    runs-on: ubuntu-latest
    steps:
      - name: Checkout tags
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 0

      - name: Fetch all tags
        run: git fetch --force --tags

      - name: Validate target version
        id: target
        shell: bash
        env:
          RAW_VERSION: ${{ inputs.version }}
        run: |
          set -euo pipefail

          VERSION="${RAW_VERSION#v}"

          case "$VERSION" in
            ''|*[!0-9.]*)
              echo "Invalid version: $VERSION"
              exit 1
              ;;
          esac

          if ! [[ "$VERSION" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "Version must be in semver format X.Y.Z"
            exit 1
          fi

          if ! git rev-parse "refs/tags/v$VERSION" >/dev/null 2>&1; then
            echo "Git tag v$VERSION does not exist"
            exit 1
          fi

          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

      - name: Setup Node.js
        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
        with:
          node-version: 24
          registry-url: https://registry.npmjs.org

      - name: Verify npm package version exists
        run: npm view "@keygraph/shannon@${{ steps.target.outputs.version }}" version

      - name: Show current npm dist-tags
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
        run: npm dist-tag ls @keygraph/shannon

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4.0.0

      - name: Log in to Docker Hub
        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2 # v4.0.0
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Verify Docker image tag exists
        run: docker buildx imagetools inspect "keygraph/shannon:${{ steps.target.outputs.version }}"

      - name: Install cosign
        uses: sigstore/cosign-installer@ba7bc0a3fef59531c69a25acd34668d6d3fe6f22 # v4.1.0

      - name: Verify Docker image signature before rollback
        run: |
          cosign verify \
            --certificate-oidc-issuer https://token.actions.githubusercontent.com \
            --certificate-identity "https://github.com/${{ github.repository }}/.github/workflows/release.yml@refs/heads/main" \
            "keygraph/shannon:${{ steps.target.outputs.version }}"

      - name: Move Docker latest
        run: |
          docker buildx imagetools create \
            --tag "keygraph/shannon:latest" \
            "keygraph/shannon:${{ steps.target.outputs.version }}"

      - name: Move npm latest
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
        run: npm dist-tag add "@keygraph/shannon@${{ steps.target.outputs.version }}" latest

      - name: Mark GitHub release as latest
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: gh release edit "v${{ steps.target.outputs.version }}" --latest

      - name: Show final npm dist-tags
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
        run: npm dist-tag ls @keygraph/shannon

      - name: Verify Docker latest now points to target
        run: docker buildx imagetools inspect "keygraph/shannon:latest"

      - name: Write summary
        run: |
          {
            echo "## Rollback latest"
            echo ""
            echo "- Target version: \`${{ steps.target.outputs.version }}\`"
            echo "- npm package: \`@keygraph/shannon\`"
            echo "- Docker image: \`keygraph/shannon\`"
            echo "- GitHub release: \`v${{ steps.target.outputs.version }}\` marked as latest"
          } >> "$GITHUB_STEP_SUMMARY"