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

      # 1. Determine Registry and Image Name dynamically
      - name: Prepare Registry Environment
        id: prep
        run: |
          # Check if running on GitHub or Gitea
          if [[ "${{ github.server_url }}" == *"github.com"* ]]; then
            echo "Running on GitHub"
            echo "REGISTRY=ghcr.io" >> $GITHUB_ENV
          else
            echo "Running on Gitea"
            # Strip 'https://' and trailing slashes from the server URL to get the hostname
            # e.g., https://gitea.my-server.com/ -> gitea.my-server.com
            CLEAN_HOST=$(echo "${{ github.server_url }}" | sed -e 's|^[^/]*//||' -e 's|/.*$||')
            echo "REGISTRY=$CLEAN_HOST" >> $GITHUB_ENV
          fi

          # Docker images must be lowercase. GitHub/Gitea repos might contain uppercase.
          IMAGE_NAME=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
          echo "IMAGE_NAME=$IMAGE_NAME" >> $GITHUB_ENV

      # 2. Login using the dynamic REGISTRY variable
      - 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

      # 3. Push using dynamic tags
      - 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