name: Deploy to Google Cloud

on:
  workflow_dispatch:
  push:
    branches:
      - main

jobs:
  deploy:
    runs-on: ubuntu-latest
    permissions:
      contents: "read"
      id-token: "write" # To authenticate to GCP
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set image name
        id: set-image-name
        run: echo "image_name=${{ vars.DOCKER_REPO_REGION }}-docker.pkg.dev/${{ vars.PROJECT_ID }}/${{ vars.DOCKER_REPO_NAME }}/kimina-lean-server:$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"

      - name: Build Docker image
        run: |
          docker build . -t "${{ steps.set-image-name.outputs.image_name }}"
        # --build-arg truc=${{ vars.TRUC}} 

      - name: "GCP auth"
        id: "auth"
        uses: "google-github-actions/auth@v2"
        with:
          workload_identity_provider: "${{ vars.WORKLOAD_IDENTITY_PROVIDER_LOCATION }}"
          service_account: "${{ vars.SERVICE_ACCOUNT }}@${{ vars.PROJECT_ID }}.iam.gserviceaccount.com"

      - name: "Set up Cloud SDK"
        uses: "google-github-actions/setup-gcloud@v2"
      - name: Configure Docker
        run: gcloud auth configure-docker ${{ vars.DOCKER_REPO_REGION }}-docker.pkg.dev

      - name: Push Docker image
        run: docker push "${{ steps.set-image-name.outputs.image_name }}"

      - name: Create new instance template
        run: |
          TEMPLATE="kimina-tpl-${{ github.sha }}"
          IMAGE="${{ steps.set-image-name.outputs.image_name }}"
          REGION="${{ vars.DOCKER_REPO_REGION }}"
          gcloud compute instance-templates create-with-container $TEMPLATE \
            --container-image=$IMAGE \
            --container-restart-policy=on-failure \
            --container-env LEAN_SERVER_HOST=0.0.0.0,LEAN_SERVER_PORT=80,LEAN_SERVER_LOG_LEVEL=INFO,LEAN_SERVER_ENVIRONMENT=prod,LEAN_SERVER_LEAN_VERSION=v4.15.0,LEAN_SERVER_MAX_REPLS=,LEAN_SERVER_MAX_REPL_USES=1000,LEAN_SERVER_MAX_REPL_MEM=8G,LEAN_SERVER_MAX_WAIT=120,LEAN_SERVER_API_KEY=${{ secrets.LEAN_SERVER_API_KEY }}, \
            --metadata=instance_group_name=ig-1 \
            --container-stdin \
            --container-tty \
            --machine-type=n2-standard-16 \
            --region=$REGION \
            --boot-disk-size=50GB --boot-disk-type=pd-ssd \
            --tags=http-server,https-server,lb-health-check

      - name: Roll out rolling‑update to MIG
        run: |
          TEMPLATE="kimina-tpl-${{ github.sha }}"
          REGION="${{ vars.DOCKER_REPO_REGION }}"
          gcloud compute instance-groups managed rolling-action start-update ig-1 \
            --version=template=$TEMPLATE \
            --max-unavailable=0 \
            --region=$REGION

      - name: Clean up old instance‑templates
        run: |
          # list all kimina‑tpl‑* templates, newest first, skip the first 5, delete the rest
          old=$(gcloud compute instance-templates list \
            --filter="name~^kimina-tpl-" \
            --sort-by="~creationTimestamp" \
            --format="value(name)" \
            | tail -n +6)
          if [ -n "$old" ]; then
            gcloud compute instance-templates delete $old -q
          fi