name: Sync Nextcloud and Build Docker

# 触发条件
on:
  schedule:
    # 每天 18:00(UTC)执行一次（相当于北京时间 02:00），周日强制全量构建
    - cron: '0 18 * * *'
  push:
    branches:
      - main
    paths:
      - 'Dockerfile'
  workflow_dispatch:          # 支持手动触发

# 环境变量（可根据需要自行修改）
env:
  NEXTCLOUD_ZIP: latest.zip
  NEXTCLOUD_DIR: nextcloud

jobs:
  sync-and-build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write   # 推送镜像需要
    steps:

      # ==================== 1. 基础准备 ====================
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0   # 需要完整历史来比较变更

      - name: Free disk space (optional)
        run: sudo df -h && sudo rm -rf /usr/share/dotnet /usr/local/lib/android /opt/ghc

      # ==================== 2. 同步 Nextcloud ====================
      - name: Create nextcloud directory
        run: mkdir -p ${{ env.NEXTCLOUD_DIR }}

      - name: Download latest.zip
        id: download
        run: |
          curl -fsSL -o ${{ env.NEXTCLOUD_ZIP }} \
            https://download.nextcloud.com/server/releases/latest.zip || exit 1

      - name: Unzip Nextcloud
        run: |
          unzip -qo ${{ env.NEXTCLOUD_ZIP }} -d ${{ env.NEXTCLOUD_DIR }}
          rm -f ${{ env.NEXTCLOUD_ZIP }}

      # ==================== 3. 检测是否有文件变更 ====================
      - name: Check for changes
        id: check_changes
        run: |
          # 如果是 push 事件且路径匹配，已在触发器里过滤，这里再做一次细粒度检查
          if [ "${{ github.event_name }}" = "push" ]; then
            echo "Push 事件，文件已匹配，直接标记为需要构建"
            echo "has_changes=true" >> $GITHUB_OUTPUT
            exit 0
          fi

          # 比较本地 nextcloud 目录与仓库中已有的差异
          git config --global --add safe.directory "$GITHUB_WORKSPACE"
          git fetch --depth=1 origin ${{ github.ref_name }} || true

          # 统计差异文件数
          CHANGES=$(git diff --name-only HEAD ${{ env.NEXTCLOUD_DIR }} | wc -l)
          if [ "$CHANGES" -gt 0 ]; then
            echo "检测到 ${{ env.NEXTCLOUD_DIR }} 目录有 $CHANGES 处变更"
            echo "has_changes=true" >> $GITHUB_OUTPUT
          else
            echo "无文件变更"
            echo "has_changes=false" >> $GITHUB_OUTPUT
          fi

      # ==================== 4. 判断是否需要构建 Docker ====================
      - name: Decide whether to build
        id: should_build
        run: |
          # 1. 周日定时任务强制构建
          if [ "${{ github.event_name }}" = "schedule" ] && [ "$(date +%w)" = "0" ]; then
            echo "周日定时任务 → 强制构建"
            echo "build=true" >> $GITHUB_OUTPUT

          # 2. push 触发且路径匹配（已在 trigger 中过滤，这里直接 true）
          elif [ "${{ github.event_name }}" = "push" ]; then
            echo "push 触发(Dockerfile)→ 构建"
            echo "build=true" >> $GITHUB_OUTPUT

          # 3. 手动触发
          elif [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "手动触发 → 构建"
            echo "build=true" >> $GITHUB_OUTPUT

          # 4. 有新的 Nextcloud 文件变更
          elif [ "${{ steps.check_changes.outputs.has_changes }}" = "true" ]; then
            echo "Nextcloud 同步有变更 → 构建"
            echo "build=true" >> $GITHUB_OUTPUT

          # 5. 其它情况（包括非周日 schedule 且无变更）
          else
            echo "无变更且非强制构建时间 → 跳过构建"
            echo "build=false" >> $GITHUB_OUTPUT
          fi

      # ==================== 5. 仅在需要时执行 Docker 构建 ====================
      - name: Set up Docker Buildx
        if: steps.should_build.outputs.build == 'true'
        uses: docker/setup-buildx-action@v3

      - name: Login to Custom Registry
        if: steps.should_build.outputs.build == 'true'
        uses: docker/login-action@v3
        with:
          registry: ${{ secrets.REGISTRY_SERVER }}/${{ gitea.repository_owner }}/nextcloud-docker
          username: ${{ gitea.actor }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Generate Beijing time version tag
        if: steps.should_build.outputs.build == 'true'
        id: version
        run: |
          echo "tag=$(TZ='Asia/Shanghai' date '+%Y%m%d-%H%M%S')" >> $GITHUB_OUTPUT

      - name: Build & Push Docker image
        if: steps.should_build.outputs.build == 'true'
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64   # 可按需调整
          push: true
          tags: |
            ${{ secrets.REGISTRY_SERVER }}/${{ gitea.repository_owner }}/nextcloud-docker:latest
            ${{ secrets.REGISTRY_SERVER }}/${{ gitea.repository_owner }}/nextcloud-docker:${{ steps.version.outputs.tag }}
          cache-from: type=registry,ref=${{ secrets.REGISTRY_SERVER }}/${{ gitea.repository_owner }}/nextcloud-docker:latest
          cache-to: type=inline,mode=max

      # ==================== 6. 提交同步的 Nextcloud 文件（可选）================
      # 如果你希望把下载的 nextcloud 目录也提交回仓库（保持同步记录），打开下面这段
      # - name: Commit synced Nextcloud files
      #   if: steps.check_changes.outputs.has_changes == 'true'
      #   run: |
      #     git config user.name "github-actions[bot]"
      #     git config user.email "github-actions@users.noreply.github.com"
      #     git add ${{ env.NEXTCLOUD_DIR }}
      #     git commit -m "chore: sync nextcloud $(date '+%Y-%m-%d %H:%M:%S')" || echo "Nothing to commit"
      #     git push origin HEAD:${{ github.ref_name }}

      # ==================== 7. 结束提示 ====================
      - name: Build summary
        if: always()
        run: |
          echo "=== 工作流执行摘要 ==="
          echo "触发方式: ${{ github.event_name }}"
          echo "是否构建: ${{ steps.should_build.outputs.build }}"
          echo "Nextcloud 变更: ${{ steps.check_changes.outputs.has_changes }}"
          [ "${{ steps.should_build.outputs.build }}" = "true" ] && echo "镜像标签: ${{ steps.version.outputs.tag }}" || true