name: Deploy to Production

# Manual production deploy — pulls pre-built images from the registry
on:
  workflow_dispatch:
    inputs:
      image_tag:
        description: "Docker image tag to deploy (commit SHA or version tag, e.g. v1.0.0)"
        required: true
        default: "latest"
        type: string

env:
  BACKEND_IMAGE: git.koppkb.com/kopkb/my-kopkb-be

jobs:
  deploy:
    runs-on: mykopkb-production

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          ref: ${{ inputs.image_tag }}

      - name: Verify image exists in registry
        run: |
          set -e
          echo "${{ secrets.REGISTRY_PASSWORD }}" | \
            docker login git.koppkb.com \
              -u "${{ secrets.REGISTRY_USERNAME }}" \
              --password-stdin

          IMAGE="${BACKEND_IMAGE}:${{ inputs.image_tag }}"
          echo "Checking if image exists: ${IMAGE}"
          docker manifest inspect "${IMAGE}" > /dev/null
          echo "✓ ${IMAGE} found"

      - name: Deploy over SSH
        env:
          PROD_HOST: ${{ secrets.PROD_HOST }}
          PROD_USER: ${{ secrets.PROD_USER }}
          PROD_SSH_KEY: ${{ secrets.PROD_SSH_KEY }}
          PROD_DEPLOY_DIR: ${{ secrets.PROD_DEPLOY_DIR }}
          REGISTRY_USERNAME: ${{ secrets.REGISTRY_USERNAME }}
          REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
          IMAGE_TAG: ${{ inputs.image_tag }}
        run: |
          set -euo pipefail

          if [ ! -f .env.production ]; then
            echo "ERROR: .env.production is missing from the repository checkout"
            exit 1
          fi
          if [ ! -f docker/production/nginx/nginx.conf ]; then
            echo "ERROR: docker/production/nginx/nginx.conf is missing from the repository checkout"
            exit 1
          fi

          if ! command -v ssh >/dev/null 2>&1; then
            apt-get update && apt-get install -y openssh-client
          fi

          mkdir -p ~/.ssh
          umask 077
          # Gitea often stores a multiline key as one line. Prefer a base64
          # secret (one line). A raw key that still contains BEGIN is accepted too.
          if printf '%s' "$PROD_SSH_KEY" | grep -q -- '-----BEGIN'; then
            printf '%b\n' "$PROD_SSH_KEY" | tr -d '\r' > ~/.ssh/id_ed25519
          else
            printf '%s' "$PROD_SSH_KEY" | tr -d '[:space:]' | base64 -d > ~/.ssh/id_ed25519
          fi
          chmod 600 ~/.ssh/id_ed25519
          if ! ssh-keygen -y -f ~/.ssh/id_ed25519 >/dev/null; then
            echo "ERROR: PROD_SSH_KEY is not a readable private key."
            echo "On the runner, run: base64 -w0 ~/.ssh/mykopkb_prod"
            echo "Put that single line in the PROD_SSH_KEY secret."
            exit 1
          fi
          ssh-keyscan -H "$PROD_HOST" >> ~/.ssh/known_hosts

          SSH=(ssh -i ~/.ssh/id_ed25519 -o IdentitiesOnly=yes "${PROD_USER}@${PROD_HOST}")
          IMAGE="${BACKEND_IMAGE}:${IMAGE_TAG}"
          NGINX_CONF="${PROD_DEPLOY_DIR}/nginx/nginx.conf"

          "${SSH[@]}" "mkdir -p '${PROD_DEPLOY_DIR}/nginx'"
          scp -i ~/.ssh/id_ed25519 -o IdentitiesOnly=yes \
            docker/production/docker-compose.production.yml \
            "${PROD_USER}@${PROD_HOST}:${PROD_DEPLOY_DIR}/docker-compose.yml"
          scp -i ~/.ssh/id_ed25519 -o IdentitiesOnly=yes \
            .env.production \
            "${PROD_USER}@${PROD_HOST}:${PROD_DEPLOY_DIR}/.env"
          scp -i ~/.ssh/id_ed25519 -o IdentitiesOnly=yes \
            docker/production/nginx/nginx.conf \
            "${PROD_USER}@${PROD_HOST}:${NGINX_CONF}"

          "${SSH[@]}" "bash -s" << EOF
          set -euo pipefail
          echo "${REGISTRY_PASSWORD}" | docker login git.koppkb.com \
            -u "${REGISTRY_USERNAME}" --password-stdin

          echo "Checking if image exists: ${IMAGE}"
          docker manifest inspect "${IMAGE}" > /dev/null
          echo "✓ ${IMAGE} found"

          echo "Deploying backend IMAGE=${IMAGE}"
          chmod 600 "${PROD_DEPLOY_DIR}/.env"

          docker network inspect mykopkb-production-network >/dev/null 2>&1 \
            || docker network create mykopkb-production-network

          cd "${PROD_DEPLOY_DIR}"
          export IMAGE_TAG="${IMAGE_TAG}"
          export NGINX_CONF="${NGINX_CONF}"

          docker rm -f mykopkb-be-production || true
          docker compose -f docker-compose.yml pull backend
          docker compose -f docker-compose.yml up -d backend

          echo "Waiting for the backend to start..."
          sleep 10

          STATUS=\$(docker compose -f docker-compose.yml ps --status running --format '{{.Name}}' backend || true)
          if [ -z "\$STATUS" ]; then
            echo "ERROR: backend is not running"
            docker compose -f docker-compose.yml ps
            docker compose -f docker-compose.yml logs --tail=50 backend || true
            exit 1
          fi
          echo "✓ backend is running (\$STATUS)"

          BE_CONTAINER=\$(docker compose -f docker-compose.yml ps -q backend)
          if docker exec "\$BE_CONTAINER" test -f /var/www/.env; then
            echo "✓ Backend .env file exists"
          else
            echo "WARNING: Backend .env file not found"
          fi

          API_PORT=\$(grep -E '^API_PORT=' .env 2>/dev/null | cut -d= -f2- | tr -d '"' || true)
          API_PORT=\${API_PORT:-8080}

          for i in 1 2 3 4 5 6; do
            if curl -sf "http://127.0.0.1:\${API_PORT}/health" > /dev/null; then
              echo "✓ backend health check passed (http://127.0.0.1:\${API_PORT}/health)"
              echo "✓ Deployed backend IMAGE_TAG=${IMAGE_TAG}"
              exit 0
            fi
            echo "Waiting for backend... attempt \${i}/6"
            sleep 5
          done

          echo "ERROR: backend health check failed (http://127.0.0.1:\${API_PORT}/health)"
          docker compose -f docker-compose.yml logs --tail=50 backend || true
          exit 1
          EOF