name: CI/CD Pipeline with Secure Ephemeral PiP

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

env:
  REGISTRY: ${{ secrets.REGISTRY_HOST }}
  APP_NAME: ${{ secrets.APP_NAME }}
  IMAGE_TAG: ${{ github.sha }}
  RUN_ID: ${{ github.run_id }}
  POSTGRES_USERNAME: ${{ secrets.PROD_DB_USERNAME }}
  POSTGRES_PASSWORD: ${{ secrets.PROD_DB_PASSWORD }}
  POSTGRES_HOST: ${{ secrets.PROD_DB_HOST }}
  POSTGRES_PORT: ${{ secrets.PROD_DB_PORT }}
  POSTGRES_DATABASE_NAME: ${{ secrets.PROD_DB_DATABASE_NAME }}
  PROD_BACKEND_HOST: ${{ secrets.PROD_BACKEND_HOST }}
  PROD_BACKEND_PORT: ${{ secrets.PROD_BACKEND_PORT }}
  PROD_FRONTEND_PORT: ${{ secrets.PROD_FRONTEND_PORT }}
  # Required pinned digests (fail if missing)
  RUST_IMG_DIGEST: ${{ secrets.RUST_IMG_DIGEST }}         # e.g., docker.io/library/rust@sha256:...
  NODE_IMG_DIGEST: ${{ secrets.NODE_IMG_DIGEST }}         # e.g., docker.io/library/node@sha256:...
  POSTGRES_IMG_DIGEST: ${{ secrets.POSTGRES_IMG_DIGEST }} # e.g., docker.io/library/postgres@sha256:...
  PODMAN_CLIENT_IMG_DIGEST: ${{ secrets.PODMAN_CLIENT_IMG_DIGEST }} # e.g., quay.io/podman/stable@sha256:...

jobs:
  test-backend:
    runs-on: [ci]
    steps:
      - uses: actions/checkout@v4

      - name: Verify pinned digests provided
        run: |
          for v in RUST_IMG_DIGEST NODE_IMG_DIGEST POSTGRES_IMG_DIGEST PODMAN_CLIENT_IMG_DIGEST; do
            [ -n "${!v}" ] || { echo "Missing $v"; exit 1; }
            echo "${!v}" | grep -Eq '^.+@sha256:[0-9a-f]{64}$' || { echo "$v must be a digest ref"; exit 1; }
          done

      - name: Setup ephemeral PiP container
        env:
          PODMAN_CLIENT_IMG_DIGEST: ${{ env.PODMAN_CLIENT_IMG_DIGEST }}
        run: |
          chmod +x ./secure_pip_setup.sh
          ./secure_pip_setup.sh

      - name: Wait for PiP readiness
        env:
          PIP_NAME: ci-pip-${{ env.RUN_ID }}
        run: |
          chmod +x ./pip_ready.sh
          ./pip_ready.sh

      - name: Configure Git for token-based authentication
        run: |
          git config --global url."https://${{ secrets.REGISTRY_USERNAME }}:${{ secrets.REGISTRY_TOKEN }}@${{ env.REGISTRY }}".insteadOf "https://${{ env.REGISTRY }}"

      - name: Create internal integration network
        run: podman exec ci-pip-${{ env.RUN_ID }} podman network create --internal integ-${{ env.RUN_ID }}

      - name: Start PostgreSQL on internal network (digest-pinned)
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} podman run -d \
            --name test-postgres \
            --network integ-${{ env.RUN_ID }} \
            -e POSTGRES_PASSWORD=password \
            -e POSTGRES_USER=postgres \
            -e POSTGRES_DB=sharenet_test \
            "${POSTGRES_IMG_DIGEST}"

      - name: Wait for PostgreSQL to be ready
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} sh -lc '
            i=0; until podman exec test-postgres pg_isready -h 127.0.0.1 -p 5432 -U postgres >/dev/null 2>&1; do
              i=$((i+1)); [ $i -gt 60 ] && { echo "pg not ready"; exit 1; }; sleep 1
            done'

      - name: Run backend unit tests
        env:
          WORKSPACE: ${{ github.workspace }}
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} sh -lc '
            podman run --rm \
              -v "$WORKSPACE":/workspace \
              -w /workspace \
              "'"${RUST_IMG_DIGEST}"'" \
              sh -c "cargo test --lib -- --test-threads=1"'

      - name: Run backend integration tests
        env:
          WORKSPACE: ${{ github.workspace }}
          RUN_ID: ${{ env.RUN_ID }}
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} sh -lc '
            podman run --rm \
              --network integ-'"$RUN_ID"' \
              -v "$WORKSPACE":/workspace \
              -w /workspace \
              -e DATABASE_URL=postgres://testuser:testpassword@test-postgres:5432/testdb \
              "'"${RUST_IMG_DIGEST}"'" \
              sh -c "cargo test --test '"'"'*'"'"' -- --test-threads=1"'

      - name: Cleanup test resources
        if: always()
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} podman rm -f test-postgres 2>/dev/null || true
          podman exec ci-pip-${{ env.RUN_ID }} podman network rm integ-${{ env.RUN_ID }} 2>/dev/null || true

      - name: Per-job cleanup (PiP container)
        if: always()
        run: podman rm -f ci-pip-${{ env.RUN_ID }} 2>/dev/null || true

  test-frontend:
    runs-on: [ci]
    needs: test-backend
    steps:
      - uses: actions/checkout@v4

      - name: Verify pinned digests provided
        run: |
          for v in NODE_IMG_DIGEST PODMAN_CLIENT_IMG_DIGEST; do
            [ -n "${!v}" ] || { echo "Missing $v"; exit 1; }
            echo "${!v}" | grep -Eq '^.+@sha256:[0-9a-f]{64}$' || { echo "$v must be a digest ref"; exit 1; }
          done

      - name: Setup ephemeral PiP container
        env:
          PODMAN_CLIENT_IMG_DIGEST: ${{ env.PODMAN_CLIENT_IMG_DIGEST }}
        run: |
          chmod +x ./secure_pip_setup.sh
          ./secure_pip_setup.sh

      - name: Wait for PiP readiness
        env:
          PIP_NAME: ci-pip-${{ env.RUN_ID }}
        run: |
          chmod +x ./pip_ready.sh
          ./pip_ready.sh

      - name: Run frontend tests (digest-pinned)
        env:
          WORKSPACE: ${{ github.workspace }}
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} sh -lc '
            podman run --rm \
              -v "$WORKSPACE":/workspace \
              -w /workspace \
              "'"${NODE_IMG_DIGEST}"'" \
              sh -c "npm ci && npm run test"'

      - name: Per-job cleanup (PiP container)
        if: always()
        run: podman rm -f ci-pip-${{ env.RUN_ID }} 2>/dev/null || true

  build-backend:
    runs-on: [ci]
    needs: test-frontend
    steps:
      - uses: actions/checkout@v4

      - name: Setup ephemeral PiP container
        env:
          PODMAN_CLIENT_IMG_DIGEST: ${{ env.PODMAN_CLIENT_IMG_DIGEST }}
        run: |
          chmod +x ./secure_pip_setup.sh
          ./secure_pip_setup.sh

      - name: Wait for PiP readiness
        env:
          PIP_NAME: ci-pip-${{ env.RUN_ID }}
        run: |
          chmod +x ./pip_ready.sh
          ./pip_ready.sh

      - name: Login to Forgejo Container Registry securely
        env:
          REGISTRY_HOST: ${{ env.REGISTRY }}
          REGISTRY_USERNAME: ${{ secrets.REGISTRY_USERNAME }}
          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
        run: |
          podman exec -i ci-pip-${{ env.RUN_ID }} sh -lc \
            'podman login "$REGISTRY_HOST" -u "$REGISTRY_USERNAME" --password-stdin' <<<"${REGISTRY_TOKEN}"

      - name: Build backend image
        env:
          REGISTRY: ${{ env.REGISTRY }}
          APP_NAME: ${{ env.APP_NAME }}
          IMAGE_TAG: ${{ env.IMAGE_TAG }}
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} sh -lc \
            'cd /workspace/backend && podman build -t "$REGISTRY/$APP_NAME/backend:$IMAGE_TAG" .'

      - name: Push backend image
        env:
          REGISTRY: ${{ env.REGISTRY }}
          APP_NAME: ${{ env.APP_NAME }}
          IMAGE_TAG: ${{ env.IMAGE_TAG }}
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} sh -lc \
            'podman push "$REGISTRY/$APP_NAME/backend:$IMAGE_TAG"'

      - name: Per-job cleanup (PiP container)
        if: always()
        run: podman rm -f ci-pip-${{ env.RUN_ID }} 2>/dev/null || true

  build-frontend:
    runs-on: [ci]
    needs: test-frontend
    steps:
      - uses: actions/checkout@v4

      - name: Setup ephemeral PiP container
        env:
          PODMAN_CLIENT_IMG_DIGEST: ${{ env.PODMAN_CLIENT_IMG_DIGEST }}
        run: |
          chmod +x ./secure_pip_setup.sh
          ./secure_pip_setup.sh

      - name: Wait for PiP readiness
        env:
          PIP_NAME: ci-pip-${{ env.RUN_ID }}
        run: |
          chmod +x ./pip_ready.sh
          ./pip_ready.sh

      - name: Login to Forgejo Container Registry securely
        env:
          REGISTRY_HOST: ${{ env.REGISTRY }}
          REGISTRY_USERNAME: ${{ secrets.REGISTRY_USERNAME }}
          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
        run: |
          podman exec -i ci-pip-${{ env.RUN_ID }} sh -lc \
            'podman login "$REGISTRY_HOST" -u "$REGISTRY_USERNAME" --password-stdin' <<<"${REGISTRY_TOKEN}"

      - name: Build frontend image
        env:
          REGISTRY: ${{ env.REGISTRY }}
          APP_NAME: ${{ env.APP_NAME }}
          IMAGE_TAG: ${{ env.IMAGE_TAG }}
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} sh -lc \
            'cd /workspace/frontend && podman build -t "$REGISTRY/$APP_NAME/frontend:$IMAGE_TAG" .'

      - name: Push frontend image
        env:
          REGISTRY: ${{ env.REGISTRY }}
          APP_NAME: ${{ env.APP_NAME }}
          IMAGE_TAG: ${{ env.IMAGE_TAG }}
        run: |
          podman exec ci-pip-${{ env.RUN_ID }} sh -lc \
            'podman push "$REGISTRY/$APP_NAME/frontend:$IMAGE_TAG"'

      - name: Per-job cleanup (PiP container)
        if: always()
        run: podman rm -f ci-pip-${{ env.RUN_ID }} 2>/dev/null || true

  deploy-prod:
    runs-on: [prod]
    needs: [build-backend, build-frontend]
    if: success()
    steps:
      - uses: actions/checkout@v4
      
      - name: Deploy to production
        env:
          REGISTRY_HOST: ${{ env.REGISTRY }}
          APP_NAME: ${{ env.APP_NAME }}
          IMAGE_TAG: ${{ env.IMAGE_TAG }}
          POSTGRES_USERNAME: ${{ env.POSTGRES_USERNAME }}
          POSTGRES_PASSWORD: ${{ env.POSTGRES_PASSWORD }}
          POSTGRES_HOST: ${{ env.POSTGRES_HOST }}
          POSTGRES_PORT: ${{ env.POSTGRES_PORT }}
          POSTGRES_DATABASE_NAME: ${{ env.POSTGRES_DATABASE_NAME }}
          PROD_BACKEND_HOST: ${{ env.PROD_BACKEND_HOST }}
          PROD_BACKEND_PORT: ${{ env.PROD_BACKEND_PORT }}
          PROD_FRONTEND_PORT: ${{ env.PROD_FRONTEND_PORT }}
        run: |
          # Install envsubst if not available (gettext package)
          command -v envsubst >/dev/null 2>&1 || { 
            if command -v apt-get >/dev/null 2>&1; then
              sudo apt-get update && sudo apt-get install -y gettext-base
            elif command -v yum >/dev/null 2>&1; then
              sudo yum install -y gettext
            elif command -v apk >/dev/null 2>&1; then
              sudo apk add gettext
            fi
          }
          
          # Substitute environment variables in prod-pod.yml
          envsubst < deploy/prod-pod.yml > prod-pod-deploy.yml
          
          # Deploy the pod (replace existing if it exists)
          podman play kube --replace prod-pod-deploy.yml
          
          # Clean up generated file
          rm -f prod-pod-deploy.yml