name: Promote to Production (manual)

# Second approval gate of the deploy model: run this workflow from the
# Actions UI after testing the feature on staging. It refuses commits
# whose staging E2E gate is not green. See docs/DEPLOY.md.

on:
  workflow_dispatch:
    inputs:
      sha:
        description: >-
          Commit SHA on main to promote (full or >=7 chars).
          Leave empty to promote the latest main commit.
        required: false
        default: ""

# Only one promotion at a time; never cancel an in-flight promotion.
concurrency:
  group: prod-promotion
  cancel-in-progress: false

env:
  REGISTRY: privaterepo.sitaru.org
  BACKEND_IMAGE_NAME: ${{ gitea.repository }}-backend
  FRONTEND_IMAGE_NAME: ${{ gitea.repository }}-frontend
  PIPELINE_IMAGE_NAME: ${{ gitea.repository }}-pipeline

jobs:
  promote-prod:
    name: Promote approved commit to Production
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository (full history for ancestry check)
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Resolve and validate target SHA
        id: resolve
        # SECURITY: the dispatch input is untrusted — it reaches the shell
        # only via env (never spliced into `run:` with ${{ }}) and is only
        # used as a quoted argument. The resolved value is validated as a
        # 40-hex sha and required to be an ancestor of main before any
        # later step interpolates it.
        env:
          SHA_INPUT: ${{ gitea.event.inputs.sha }}
        run: |
          set -euo pipefail
          case "$SHA_INPUT" in
            -*) echo "REFUSED: SHA input may not start with '-'." >&2; exit 1 ;;
          esac
          if [ -z "$SHA_INPUT" ]; then
            SHA_INPUT="$(git rev-parse origin/main)"
          fi
          FULL_SHA=$(git rev-parse --verify --quiet "${SHA_INPUT}^{commit}") || {
            echo "REFUSED: not a commit in this repository." >&2
            exit 1
          }
          echo "$FULL_SHA" | grep -Eq '^[0-9a-f]{40}$'
          if ! git merge-base --is-ancestor "$FULL_SHA" origin/main; then
            echo "REFUSED: $FULL_SHA is not on main — only main commits are promotable." >&2
            exit 1
          fi
          SHORT_SHA="sha-$(echo "$FULL_SHA" | cut -c1-7)"
          echo "full=$FULL_SHA" >> "$GITHUB_OUTPUT"
          echo "short=$SHORT_SHA" >> "$GITHUB_OUTPUT"
          echo "Promoting $FULL_SHA (images tagged $SHORT_SHA)"

      - name: Verify the staging E2E gate passed for this commit
        run: |
          STATUS_JSON=$(curl -fsS \
            -H "Authorization: token ${{ secrets.REGISTRY_TOKEN }}" \
            "https://${REGISTRY}/api/v1/repos/${{ gitea.repository }}/commits/${{ steps.resolve.outputs.full }}/status")
          echo "$STATUS_JSON" | python3 -c "
          import json, sys
          d = json.load(sys.stdin)
          ok = [s for s in d.get('statuses', [])
                if 'E2E Journeys against Staging' in s.get('context', '')
                and s.get('status') == 'success']
          if not ok:
              print('REFUSED: no successful \"E2E Journeys against Staging\" status on this commit.')
              print('Contexts found:', [s.get('context') for s in d.get('statuses', [])])
              sys.exit(1)
          print('E2E gate verified green for this commit.')
          "

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ gitea.actor }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Retag approved images as prod (keeping rollback pointer)
        run: |
          SHORT_SHA="${{ steps.resolve.outputs.short }}"
          for IMAGE in \
            "${REGISTRY}/${BACKEND_IMAGE_NAME}" \
            "${REGISTRY}/${FRONTEND_IMAGE_NAME}" \
            "${REGISTRY}/${PIPELINE_IMAGE_NAME}"; do
            # Keep a rollback pointer before moving :prod
            docker buildx imagetools create -t "${IMAGE}:prod-previous" "${IMAGE}:prod" || true
            docker buildx imagetools create -t "${IMAGE}:prod" "${IMAGE}:${SHORT_SHA}"
            echo "Promoted ${IMAGE}:${SHORT_SHA} -> :prod"
          done

      - name: Trigger production stack update
        run: curl -fsSk -X POST "${{ secrets.PORTAINER_PROD_WEBHOOK }}"

      - name: Wait for production to become healthy
        run: |
          echo "Polling ${PROD_BASE_URL} for up to 5 minutes..."
          for i in $(seq 1 60); do
            if curl -fsS -o /dev/null --max-time 10 "${PROD_BASE_URL}/"; then
              echo "Production is up (attempt $i)"
              exit 0
            fi
            sleep 5
          done
          echo "Production did not become healthy in time" >&2
          exit 1
        env:
          PROD_BASE_URL: ${{ secrets.PROD_BASE_URL }}