name: Docker Image CI

on:
  push:
    branches:
      - main
    tags:
      - 'v*'
  workflow_dispatch:

env:
  REGISTRY_DOCKERHUB: docker.io
  REGISTRY_GHCR: ghcr.io
  IMAGE_NAME: isboyjc/goproxy

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3.2.0
      
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.7.1
      
      - name: Check for Docker Hub credentials
        id: dockerhub-check
        shell: bash
        run: |
          if [ "${{ secrets.DOCKERHUB_USERNAME }}" != '' ]; then
            echo "available=true" >> $GITHUB_OUTPUT
          else
            echo "available=false" >> $GITHUB_OUTPUT
          fi
      
      - name: Extract metadata for GHCR
        id: meta-ghcr
        uses: docker/metadata-action@v5.5.1
        with:
          images: ${{ env.REGISTRY_GHCR }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=raw,value=latest,enable={{is_default_branch}}
      
      - name: Extract metadata for Docker Hub
        id: meta-dockerhub
        if: steps.dockerhub-check.outputs.available == 'true'
        uses: docker/metadata-action@v5.5.1
        with:
          images: ${{ env.REGISTRY_DOCKERHUB }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=raw,value=latest,enable={{is_default_branch}}
      
      - name: Login to Docker Hub
        if: github.event_name != 'pull_request' && steps.dockerhub-check.outputs.available == 'true'
        uses: docker/login-action@v3.3.0
        with:
          registry: ${{ env.REGISTRY_DOCKERHUB }}
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      
      - name: Login to GitHub Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3.3.0
        with:
          registry: ${{ env.REGISTRY_GHCR }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Build and push to GHCR
        uses: docker/build-push-action@v6.9.0
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta-ghcr.outputs.tags }}
          labels: ${{ steps.meta-ghcr.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
      
      - name: Build and push to Docker Hub
        if: github.event_name != 'pull_request' && steps.dockerhub-check.outputs.available == 'true'
        uses: docker/build-push-action@v6.9.0
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta-dockerhub.outputs.tags }}
          labels: ${{ steps.meta-dockerhub.outputs.labels }}
          cache-from: type=gha
