name: Publish Docker image

on:
  push:
    branches: [ "main" ]
    tags:
      - "v*"
  workflow_dispatch:

permissions:
  contents: read
  packages: write

env:
  REGISTRY: docker.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    name: Build and push image
    runs-on: ubuntu-latest
    concurrency:
      group: docker-${{ github.ref }}
      cancel-in-progress: false
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up QEMU (for multi-arch builds)
        uses: docker/setup-qemu-action@v3

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

      - name: Cache Docker layers
        uses: actions/cache@v4
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ hashFiles('Dockerfile', 'pubspec.lock') }}
          restore-keys: |
            ${{ runner.os }}-buildx-

      # Docker Hub login (active)
      - name: Log in to Docker Hub
        uses: docker/login-action@v3
        with:
          registry: docker.io
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      # GHCR login (commented out for future usage)
      # - name: Log in to GitHub Container Registry
      #   uses: docker/login-action@v3
      #   with:
      #     registry: ghcr.io
      #     username: ${{ github.actor }}
      #     password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
          flavor: |
            latest=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max

      - name: Move cache
        if: always()
        run: |
          if [ -d /tmp/.buildx-cache-new ]; then
            rm -rf /tmp/.buildx-cache
            mv /tmp/.buildx-cache-new /tmp/.buildx-cache
          else
            echo "No new cache to move"
          fi