name: Build & Deploy to Azure Container Apps

# Deploys the app to the existing Azure Container App on every push to main.
# Can also be run manually from the Actions tab (workflow_dispatch).
on:
  push:
    branches: [ main ]
  workflow_dispatch:

env:
  ACR_NAME: pathoragacr                 # Azure Container Registry (name only)
  IMAGE_NAME: pathorag                  # repository/image name
  RESOURCE_GROUP: patho-rag             # resource group of the Container App
  CONTAINERAPP_NAME: pathorag           # Container App name

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest
    steps:
      # LFS is REQUIRED: the FAISS index (output/biomedbert_vector_db/faiss.index)
      # is a git-LFS object. Without lfs:true the build context would receive a
      # pointer stub and faiss would fail with the "vers" magic-number error.
      - name: Checkout (with LFS)
        uses: actions/checkout@v4
        with:
          lfs: true

      - name: Azure login
        uses: azure/login@v2
        with:
          creds: ${{ secrets.AZURE_CREDENTIALS }}

      # Container Apps CLI extension, non-interactive install on the runner.
      - name: Enable containerapp CLI extension
        run: az config set extension.use_dynamic_install=yes_without_prompt

      # Build the image in ACR (cloud build — no local Docker needed).
      # Tag with the commit SHA (for a unique, traceable revision) and latest.
      - name: Build image in ACR
        run: |
          az acr build \
            --registry "$ACR_NAME" \
            --image "$IMAGE_NAME:${{ github.sha }}" \
            --image "$IMAGE_NAME:latest" \
            .

      # Deploy the SHA-tagged image so Container Apps always creates a new
      # revision (deploying :latest to the same tag may not roll a revision).
      - name: Deploy to Container App
        run: |
          az containerapp update \
            --resource-group "$RESOURCE_GROUP" \
            --name "$CONTAINERAPP_NAME" \
            --image "$ACR_NAME.azurecr.io/$IMAGE_NAME:${{ github.sha }}"

      - name: Show app URL
        run: |
          FQDN=$(az containerapp show -g "$RESOURCE_GROUP" -n "$CONTAINERAPP_NAME" \
                   --query properties.configuration.ingress.fqdn -o tsv)
          echo "Deployed: https://$FQDN"
          echo "### ✅ Deployed to https://$FQDN" >> "$GITHUB_STEP_SUMMARY"