name: Docker Build & Push

on:
  push:
    branches: [main]
    tags: ["v*"]
  pull_request:
    branches: [main]

env:
  REGISTRY: gitea.alterminal.com
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    runs-on: ubuntu-latest

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

      # The Gitea runner runs this job in a `node` container which has no
      # Docker CLI. The docker daemon socket is mounted, so we only need the
      # client (`docker login` / `docker` CLI) to authenticate and build.
      - name: Install Docker CLI
        run: |
          apt-get update
          apt-get install -y --no-install-recommends docker.io

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        with:
          driver: docker

      # Gitea Actions' automatic GITEA_TOKEN/GITHUB_TOKEN cannot publish to the
      # container registry. A Personal Access Token is required instead:
      #   - secrets.PUSH_PACKAGE_USERNAME: a user that can push to this org's packages
      #   - secrets.PUSH_PACKAGE_PASSWORD: that user's PAT with write:package scope
      # (Same arrangement as alterminal/bear .github/workflows/docker-publish.yml.)
      - name: Log in to Gitea Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.PUSH_PACKAGE_USERNAME }}
          password: ${{ secrets.PUSH_PACKAGE_PASSWORD }}

      # 本專案版本以 git tag（v0.0.1 …）為準：推送 v* tag 時產生
      # X.Y.Z / X.Y / X 版本標籤；推送 main 另帶 branch 與 sha 標籤。
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=ref,event=branch
            type=ref,event=pr
            type=sha,format=long

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}