name: Build and Push Docker Images

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

env:
  REGISTRY_GHCR: ghcr.io

jobs:
  # 预处理: 转换镜像名为小写
  prepare:
    runs-on: ubuntu-22.04
    outputs:
      image_base: ${{ steps.lowercase.outputs.image_base }}
    steps:
      - name: Convert repository name to lowercase
        id: lowercase
        run: |
          REPO_LOWER=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
          echo "image_base=${REPO_LOWER}" >> $GITHUB_OUTPUT
          echo "Lowercase repository: ${REPO_LOWER}"

  # 并行构建策略: 使用原生架构 runner 提升速度
  # GitHub Actions 现在支持原生 ARM64 runner (ubuntu-22.04-arm)
  build-and-push:
    needs: prepare
    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write

    strategy:
      # 并行运行所有构建任务
      fail-fast: false
      matrix:
        include:
          # Backend builds
          - name: backend
            dockerfile: ./docker/Dockerfile.backend
            image_suffix: backend
            platform: linux/amd64
            arch_tag: amd64
            runner: ubuntu-22.04
          - name: backend
            dockerfile: ./docker/Dockerfile.backend
            image_suffix: backend
            platform: linux/arm64
            arch_tag: arm64
            runner: ubuntu-22.04-arm  # 原生 ARM64 runner
          # Frontend builds
          - name: frontend
            dockerfile: ./docker/Dockerfile.frontend
            image_suffix: frontend
            platform: linux/amd64
            arch_tag: amd64
            runner: ubuntu-22.04
          - name: frontend
            dockerfile: ./docker/Dockerfile.frontend
            image_suffix: frontend
            platform: linux/arm64
            arch_tag: arm64
            runner: ubuntu-22.04-arm  # 原生 ARM64 runner
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      # 原生 ARM64 runner 不需要 QEMU 模拟
      # 只在需要时设置 QEMU (理论上不需要,因为是原生构建)

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      
      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY_GHCR }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Log in to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
        continue-on-error: true
      
      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.REGISTRY_GHCR }}/${{ needs.prepare.outputs.image_base }}/nofx-${{ matrix.image_suffix }}
            ${{ secrets.DOCKERHUB_USERNAME && format('{0}/nofx-{1}', secrets.DOCKERHUB_USERNAME, matrix.image_suffix) || '' }}
          tags: |
            type=ref,event=branch,suffix=-${{ matrix.arch_tag }}
            type=semver,pattern={{version}},suffix=-${{ matrix.arch_tag }}
            type=semver,pattern={{major}}.{{minor}},suffix=-${{ matrix.arch_tag }}
            type=sha,prefix={{branch}}-,suffix=-${{ matrix.arch_tag }}

      - name: Build and push ${{ matrix.name }}-${{ matrix.arch_tag }} image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ${{ matrix.dockerfile }}
          # 单独构建每个架构,4 个任务并行运行
          platforms: ${{ matrix.platform }}
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          # 使用架构特定的缓存
          cache-from: type=gha,scope=${{ matrix.name }}-${{ matrix.arch_tag }}
          cache-to: type=gha,mode=max,scope=${{ matrix.name }}-${{ matrix.arch_tag }}
          build-args: |
            BUILD_DATE=${{ github.event.head_commit.timestamp }}
            VCS_REF=${{ github.sha }}
            VERSION=${{ github.ref_name }}

      - name: Image digest
        run: |
          echo "✅ Built: ${{ matrix.name }}-${{ matrix.arch_tag }}"
          echo "Platform: ${{ matrix.platform }}"
          echo "Tags: ${{ steps.meta.outputs.tags }}"

  # 合并多架构镜像为统一 manifest
  create-manifest:
    needs: [prepare, build-and-push]
    runs-on: ubuntu-22.04
    permissions:
      contents: read
      packages: write

    strategy:
      matrix:
        image_suffix: [backend, frontend]

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

      - name: Log in to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
        continue-on-error: true

      - name: Create and push multi-arch manifest
        run: |
          # 提取分支/标签名
          REF_NAME="${{ github.ref_name }}"

          # GHCR manifest (使用小写仓库名)
          REPO_LOWER="${{ needs.prepare.outputs.image_base }}"
          GHCR_IMAGE="${{ env.REGISTRY_GHCR }}/${REPO_LOWER}/nofx-${{ matrix.image_suffix }}"

          echo "📦 Creating manifest for ${{ matrix.image_suffix }}..."
          echo "Repository: ${REPO_LOWER}"
          echo "Image: ${GHCR_IMAGE}"

          # 创建并推送 manifest (合并 amd64 和 arm64)
          docker buildx imagetools create -t "${GHCR_IMAGE}:${REF_NAME}" \
            "${GHCR_IMAGE}:${REF_NAME}-amd64" \
            "${GHCR_IMAGE}:${REF_NAME}-arm64"

          # 如果是主分支,也创建 latest 标签
          if [[ "${{ github.ref }}" == "refs/heads/main" ]] || [[ "${{ github.ref }}" == "refs/heads/dev" ]]; then
            docker buildx imagetools create -t "${GHCR_IMAGE}:latest" \
              "${GHCR_IMAGE}:${REF_NAME}-amd64" \
              "${GHCR_IMAGE}:${REF_NAME}-arm64"
            echo "✅ Created latest tag"
          fi

          # Docker Hub manifest (如果配置了)
          if [[ -n "${{ secrets.DOCKERHUB_USERNAME }}" ]]; then
            DOCKERHUB_IMAGE="${{ secrets.DOCKERHUB_USERNAME }}/nofx-${{ matrix.image_suffix }}"
            docker buildx imagetools create -t "${DOCKERHUB_IMAGE}:${REF_NAME}" \
              "${DOCKERHUB_IMAGE}:${REF_NAME}-amd64" \
              "${DOCKERHUB_IMAGE}:${REF_NAME}-arm64" || true
            echo "✅ Created Docker Hub manifest"
          fi

          echo "🎉 Multi-arch manifest created successfully!"