name: Build and Deploy to k3s

on:
  push:
    branches: [main]
  workflow_dispatch:

env:
  NAMESPACE: student-enrollment
  API_IMAGE: student-api
  FRONTEND_IMAGE: student-frontend

jobs:
  # Build jobs run in parallel for speed
  build-api:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

      - name: Build API with cache
        uses: docker/build-push-action@v5
        with:
          context: .
          file: deploy/docker/Dockerfile.api
          push: false
          load: true
          tags: ${{ env.API_IMAGE }}:${{ github.sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Save API image
        run: docker save ${{ env.API_IMAGE }}:${{ github.sha }} | gzip > /tmp/api-image.tar.gz

      - name: Upload API artifact
        uses: actions/upload-artifact@v4
        with:
          name: api-image
          path: /tmp/api-image.tar.gz
          retention-days: 1

  build-frontend:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

      - name: Build Frontend with cache
        uses: docker/build-push-action@v5
        with:
          context: .
          file: deploy/docker/Dockerfile.frontend
          push: false
          load: true
          tags: ${{ env.FRONTEND_IMAGE }}:${{ github.sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Save Frontend image
        run: docker save ${{ env.FRONTEND_IMAGE }}:${{ github.sha }} | gzip > /tmp/frontend-image.tar.gz

      - name: Upload Frontend artifact
        uses: actions/upload-artifact@v4
        with:
          name: frontend-image
          path: /tmp/frontend-image.tar.gz
          retention-days: 1

  deploy:
    runs-on: ubuntu-latest
    needs: [build-api, build-frontend]
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Download API image
        uses: actions/download-artifact@v4
        with:
          name: api-image
          path: /tmp

      - name: Download Frontend image
        uses: actions/download-artifact@v4
        with:
          name: frontend-image
          path: /tmp

      - name: Import images to k3s
        run: |
          gunzip -c /tmp/api-image.tar.gz | sudo k3s ctr images import -
          gunzip -c /tmp/frontend-image.tar.gz | sudo k3s ctr images import -

      - name: Update deployments with new tag
        run: |
          kubectl -n ${{ env.NAMESPACE }} set image deployment/student-api \
            api=${{ env.API_IMAGE }}:${{ github.sha }}
          kubectl -n ${{ env.NAMESPACE }} set image deployment/student-frontend \
            frontend=${{ env.FRONTEND_IMAGE }}:${{ github.sha }}

      - name: Wait for rollout
        run: |
          kubectl -n ${{ env.NAMESPACE }} rollout status deployment/student-api --timeout=120s
          kubectl -n ${{ env.NAMESPACE }} rollout status deployment/student-frontend --timeout=60s

      - name: Health check
        run: |
          sleep 10
          API_POD=$(kubectl -n ${{ env.NAMESPACE }} get pods -l app=student-api -o jsonpath='{.items[0].metadata.name}')
          kubectl -n ${{ env.NAMESPACE }} exec $API_POD -- wget -q --spider http://localhost:5000/health || exit 1
          echo "Deployment healthy!"