# 脚本功能：批量给现有 Markdown 文章添加 pid 字段，按发布时间升序排列（1, 2, 3...）

$postsPath = "content/post"
$files = Get-ChildItem -Path $postsPath -Filter "*.md"

Write-Host "正在扫描文章..."
$postData = @()

foreach ($file in $files) {
    $content = Get-Content $file.FullName -Raw -Encoding UTF8
    
    # 提取日期
    if ($content -match "(?m)^date:\s*([0-9T:-\s]+)") {
        $dateStr = $matches[1].Trim()
        try {
            $date = [DateTime]::Parse($dateStr)
        } catch {
            $date = $file.CreationTime
        }
    } else {
        $date = $file.CreationTime
    }
    
    $postData += [PSCustomObject]@{
        Path = $file.FullName
        Date = $date
        Content = $content
    }
}

# 按时间排序
$sortedPosts = $postData | Sort-Object Date

$id = 1
foreach ($post in $sortedPosts) {
    $content = $post.Content
    
    # 检查是否已有 pid
    if ($content -match "(?m)^pid:\s*\d+") {
        # 更新 pid
        $newContent = $content -replace "(?m)^pid:\s*\d+", "pid: $id"
    } else {
        # 插入 pid (在第二个 --- 之前，或者在 layout/title 之后)
        # 简单策略：在第一个 --- 后面插入
        # 注意：Raw string start with ---
        
        if ($content -match "^---\s*\r?\n") {
            $newContent = $content -replace "^---\s*\r?\n", "--`npid: $id`n"
        } else {
            # 异常情况，直接追加
            Write-Host "Skipping $($post.Path) (No front matter found)"
            continue
        }
    }
    
    # 保持 UTF8 编码 (无 BOM 或带 BOM 取决于原文件，这里统一用 UTF8)
    [System.IO.File]::WriteAllText($post.Path, $newContent, [System.Text.Encoding]::UTF8)
    
    Write-Host "Updated $($post.Path) with pid: $id"
    $id++
}

Write-Host "处理完成！共更新 $($id - 1) 篇文章。"