name: Build and Push Docker Image

on:
  workflow_dispatch:
  push:
    branches:
      - main
    paths:
      - 'app.py'
      - 'dockerfile'
      - 'requirements.txt'
      - 'docker-compose.yml'

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Prepare Registry Environment
        id: prep
        run: |
          # 1. Dynamic Registry Detection
          # This reads the Gitea ROOT_URL automatically.
          if [[ "${{ github.server_url }}" == *"github.com"* ]]; then
            echo "REGISTRY=ghcr.io" >> $GITHUB_ENV
          else
            # Strips 'https://' and path to get 'gitea.service.dc1.fbleagh.duckdns.org'
            CLEAN_HOST=$(echo "${{ github.server_url }}" | sed -e 's|^[^/]*//||' -e 's|/.*$||')
            echo "REGISTRY=$CLEAN_HOST" >> $GITHUB_ENV
          fi

          # 2. Lowercase Image Name
          IMAGE_NAME=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
          echo "IMAGE_NAME=$IMAGE_NAME" >> $GITHUB_ENV

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        # NOTE: "http = true" block removed because you are now on SSL.
        # If your certificate is valid, you don't need any config here.

      - name: Build and push multi-arch Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          platforms: linux/amd64,linux/arm64
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max