param()

$ErrorActionPreference = 'Stop'
$principal = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
if (-not $principal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
    throw '请在“以管理员身份运行”的 PowerShell 中执行本脚本。'
}

$oldDataDirectory = 'C:\ProgramData\MySQL\MySQL Server 8.4\Data'
$newDataDirectory = 'D:\MySQL\MySQL Server 8.4\Data'
$configurationFile = 'C:\ProgramData\MySQL\MySQL Server 8.4\my.ini'

if (-not (Test-Path -LiteralPath $oldDataDirectory)) {
    Write-Host 'C 盘旧数据目录已不存在，无需清理。'
    exit 0
}

$resolvedOld = (Resolve-Path -LiteralPath $oldDataDirectory).Path.TrimEnd('\')
if ($resolvedOld -ne $oldDataDirectory) {
    throw "旧目录安全校验失败：$resolvedOld"
}
if (-not (Test-Path -LiteralPath $newDataDirectory)) {
    throw "D 盘活动数据目录不存在：$newDataDirectory"
}
$configuredDataDirectory = (Select-String -LiteralPath $configurationFile -Pattern '^datadir=').Line
if ($configuredDataDirectory -ne 'datadir=D:/MySQL/MySQL Server 8.4/Data') {
    throw "MySQL 配置未指向 D 盘，拒绝清理：$configuredDataDirectory"
}

Remove-Item -LiteralPath $oldDataDirectory -Recurse -Force
Write-Host 'C 盘旧 MySQL 数据目录已清理。D 盘活动目录和回退副本均未修改。'