# .gitea/workflows/reusable-docker-build.yml
name: Reusable Docker Build

on:
  workflow_call:
    inputs:
      dockerfile:
        description: 'Dockerfile 路径（相对于仓库根目录）'
        required: true
        type: string
      context:
        description: '构建上下文路径（相对于仓库根目录）'
        required: false
        type: string
        default: '.'
      image_name:
        description: 'Docker 镜像名称（不含标签）'
        required: true
        type: string
      image_tag:
        description: 'Docker 镜像标签/版本'
        required: true
        type: string
      checkout_ref:
        description: '要检出的分支或标签'
        required: false
        type: string
        default: ''
      enable_cache:
        description: '是否启用 Docker 构建缓存'
        required: false
        type: boolean
        default: true
      build_args:
        description: 'Docker 构建参数（每行一个，格式: KEY=VALUE）'
        required: false
        type: string
        default: ''

jobs:
  build:
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          ref: ${{ inputs.checkout_ref || github.ref }}
          fetch-depth: 0

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

      - name: Cache Docker layers
        if: ${{ inputs.enable_cache }}
        uses: actions/cache@v3
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ inputs.image_name }}-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-${{ inputs.image_name }}-
            ${{ runner.os }}-buildx-

      - name: Prepare build arguments
        id: prepare
        run: |
          echo "====== 准备构建参数 ======"
          
          DOCKERFILE="${{ inputs.dockerfile }}"
          CONTEXT="${{ inputs.context }}"
          IMAGE_NAME="${{ inputs.image_name }}"
          IMAGE_TAG="${{ inputs.image_tag }}"
          FULL_IMAGE="${IMAGE_NAME}:${IMAGE_TAG}"
          
          echo "Dockerfile: $DOCKERFILE"
          echo "Context: $CONTEXT"
          echo "Image: $FULL_IMAGE"
          
          # 验证 Dockerfile 存在
          if [ ! -f "$DOCKERFILE" ]; then
            echo "✗ Dockerfile 不存在: $DOCKERFILE"
            exit 1
          fi
          
          # 验证上下文目录存在
          if [ ! -d "$CONTEXT" ]; then
            echo "✗ 构建上下文目录不存在: $CONTEXT"
            exit 1
          fi
          
          echo "✓ 构建参数验证通过"
          echo ""
          
          # 设置输出变量
          echo "full_image=$FULL_IMAGE" >> $GITHUB_OUTPUT
          
          # 处理构建参数
          BUILD_ARGS=""
          if [ -n "${{ inputs.build_args }}" ]; then
            echo "====== 构建参数 ======"
            while IFS= read -r line; do
              if [ -n "$line" ]; then
                echo "  $line"
                BUILD_ARGS="$BUILD_ARGS --build-arg $line"
              fi
            done <<< "${{ inputs.build_args }}"
            echo ""
          fi
          
          echo "build_args=$BUILD_ARGS" >> $GITHUB_OUTPUT

      - name: Build Docker image
        run: |
          echo "====== 开始构建 Docker 镜像 ======"
          echo "构建时间: $(date '+%Y-%m-%d %H:%M:%S')"
          echo "分支: ${{ github.ref_name }}"
          echo ""

          echo "====== 构建配置 ======"
          echo "镜像: ${{ steps.prepare.outputs.full_image }}"
          echo "Dockerfile: ${{ inputs.dockerfile }}"
          echo "Context: ${{ inputs.context }}"
          echo ""
          
          # 构建命令
          BUILD_CMD="docker build \
            -t ${{ steps.prepare.outputs.full_image }} \
            -f ${{ inputs.dockerfile }} \
            ${{ steps.prepare.outputs.build_args }} \
            ${{ inputs.context }}"
          
          echo "执行命令:"
          echo "$BUILD_CMD"
          echo ""
          
          # 执行构建
          eval $BUILD_CMD
          
          echo ""
          echo "====== 镜像构建完成 ======"

      - name: Verify image
        run: |
          echo "====== 验证构建的镜像 ======"
          
          IMAGE="${{ steps.prepare.outputs.full_image }}"
          
          if docker image inspect "${IMAGE}" >/dev/null 2>&1; then
            SIZE=$(docker image inspect "${IMAGE}" --format='{{.Size}}' | awk '{printf "%.2f", $1/1024/1024}')
            CREATED=$(docker image inspect "${IMAGE}" --format='{{.Created}}')
            ID=$(docker image inspect "${IMAGE}" --format='{{.Id}}' | cut -d':' -f2 | cut -c1-12)
            
            echo "✓ ${IMAGE}"
            echo "  镜像 ID: ${ID}"
            echo "  大小: ${SIZE} MB"
            echo "  创建时间: ${CREATED}"
          else
            echo "✗ ${IMAGE} 验证失败"
            exit 1
          fi
          
          echo ""
          echo "✓ 镜像验证成功"

      - name: Cleanup
        if: always()
        run: |
          echo "====== 清理悬空镜像 ======"
          docker image prune -f
          echo "✓ 清理完成"