name: Build Sphinx Documentation

on:
  pull_request:
    types: [opened, synchronize, reopened, edited]
    branches: [master]

jobs:
  build-docs:
    name: Build Documentation from PR Branch
    runs-on: linux

    steps:
      # 第一步：获取PR分支最新代码
      - name: Fetch latest PR branch code
        run: |
          echo "=== Fetching latest code for PR branch: ${{ github.head_ref }} ==="
          
          # 如果目录不存在，克隆仓库
          if [ ! -d "/home/ly0kos/work/test_env" ]; then
            echo "Cloning repository..."
            git clone http://localhost:3000/yuysh/Manlink_Doc.git /home/ly0kos/work/test_env
          fi
          
          # 进入目录并获取最新代码
          cd /home/ly0kos/work/test_env
          
          # 清理任何未提交的更改
          git reset --hard
          git clean -fd
          
          # 获取所有远程分支和更新
          git fetch --all --prune
          
          # 切换到PR分支并获取最新代码
          git checkout ${{ github.head_ref }}
          git pull origin ${{ github.head_ref }} --force
          
          echo "✓ Latest code fetched for branch: ${{ github.head_ref }}"
          echo "Current commit: $(git log --oneline -1)"

      # 第二步：复用或创建Python虚拟环境
      - name: Reuse or update Python virtual environment
        run: |
          echo "Setting up Python environment for PR branch: ${{ github.head_ref }}"
          cd /home/ly0kos/work/test_env
          
          # 检查虚拟环境是否存在
          if [ ! -d ".venv-pr" ]; then
            echo "Creating new virtual environment..."
            python -m venv .venv-pr
            source .venv-pr/bin/activate
            pip install --upgrade pip
            # 安装基础依赖
            pip install sphinx sphinx-rtd-theme
          else
            echo "Reusing existing virtual environment..."
            source .venv-pr/bin/activate
          fi
          
          # 检查requirements.txt是否更新
          if [ -f "requirements.txt" ]; then
            echo "Checking for dependency updates..."
            # 获取requirements.txt的修改时间
            REQ_MOD_TIME=$(stat -c %Y requirements.txt 2>/dev/null || echo 0)
            # 获取虚拟环境中记录的最后更新时间
            VENV_MOD_TIME=$(cat .venv-pr/last_update.txt 2>/dev/null || echo 0)
            
            if [ $REQ_MOD_TIME -gt $VENV_MOD_TIME ]; then
              echo "Requirements updated, installing new dependencies..."
              pip install -r requirements.txt
              # 记录更新时间
              echo $REQ_MOD_TIME > .venv-pr/last_update.txt
            else
              echo "No changes in requirements, skipping dependency installation"
            fi
          else
            echo "No requirements.txt found, using existing packages"
          fi
          
          # 显示当前环境信息
          echo "Python: $(python --version)"
          echo "Pip: $(pip --version)"
          echo "Installed packages:"
          pip list | grep sphinx

      # 第三步：构建文档(从PR分支)
      - name: Build documentation from PR branch
        run: |
          echo "=== Building documentation from PR branch: ${{ github.head_ref }} ==="
          cd /home/ly0kos/work/test_env
          source .venv-pr/bin/activate
          
          # 确保源目录存在
          if [ ! -d "source" ]; then
            echo "Error: source directory not found!"
            exit 1
          fi
          
          # 清理旧构建
          rm -rf build/
          
          # 构建文档
          sphinx-build -b html source build -v -j 4
          
          # 将构建结果复制到预览位置
          mkdir -p /home/ly0kos/work/test_env/pr-builds/
          rm -rf /home/ly0kos/work/test_env/pr-builds/${{ github.head_ref }}
          cp -r build /home/ly0kos/work/test_env/pr-builds/${{ github.head_ref }}
          
          echo "✓ Build completed for PR branch: ${{ github.head_ref }}"

      # 第四步：验证构建结果
      - name: Verify build
        run: |
          echo "Build output for PR ${{ github.head_ref }}:"
          ls -la /home/ly0kos/work/test_env/pr-builds/${{ github.head_ref }}/ | head -10
          echo "Preview available at: /home/ly0kos/work/test_env/pr-builds/${{ github.head_ref }}/index.html"