name: Deploy Next.js to Raspberry Pi

on:
  push:
    branches:
      - main
      - dev
      - preview

jobs:
  deploy:
    runs-on: self-hosted  # Der Runner sollte auf dem Raspberry Pi laufen

    steps:
      - name: Checkout Code
        uses: actions/checkout@v3

      - name: Set Environment Variables
        run: |
          if [[ "${{ github.ref_name }}" == "main" ]]; then
            echo "DEPLOY_ENV=main" >> $GITHUB_ENV
            echo "PORT=3000" >> $GITHUB_ENV
          elif [[ "${{ github.ref_name }}" == "dev" ]]; then
            echo "DEPLOY_ENV=dev" >> $GITHUB_ENV
            echo "PORT=3001" >> $GITHUB_ENV
          elif [[ "${{ github.ref_name }}" == "preview" ]]; then
            echo "DEPLOY_ENV=preview" >> $GITHUB_ENV
            echo "PORT=3002" >> $GITHUB_ENV
          fi

      - name: Build Docker Image
        run: |
          IMAGE_NAME="my-nextjs-app:$DEPLOY_ENV"
          docker build -t $IMAGE_NAME .

      - name: Deploy on Raspberry Pi (Zero-Downtime)
        run: |
          CONTAINER_NAME="nextjs-$DEPLOY_ENV"
          IMAGE_NAME="my-nextjs-app:$DEPLOY_ENV"
          NEW_CONTAINER_NAME="$CONTAINER_NAME-new"

          # Pull latest image version if exists
          docker pull $IMAGE_NAME || true

          # Run new container on a different port
          docker run -d --name "$NEW_CONTAINER_NAME" -p 30000:3000 $IMAGE_NAME

          # Wait to ensure the new container is up and running
          sleep 10

          # Check if new container is healthy and running
          if [ $(docker inspect --format='{{.State.Running}}' $NEW_CONTAINER_NAME) == "true" ]; then
            # Stop and remove the old container
            docker stop "$CONTAINER_NAME" || true
            docker rm "$CONTAINER_NAME" || true

            # Rename new container to the old container’s name
            docker rename "$NEW_CONTAINER_NAME" "$CONTAINER_NAME"

            # Reassign the desired port (e.g., 3000 for main branch) to the new container
            docker run -d --name "$CONTAINER_NAME" -p $PORT:3000 $IMAGE_NAME
          else
            echo "New container failed to start."
            docker logs $NEW_CONTAINER_NAME
            exit 1
          fi