# 服务器侧：发布新后台静态到 admin\releases\<id>\dist，并切换 admin\current 联接
# 根目录：E:\wwwroot。禁止动 C:\yutongda。Nginx conf 必须无 BOM。
$ErrorActionPreference = "Stop"
$IncomingZip = "C:\Users\ytd_extdev_0903\incoming\admin-dist.zip"
$IncomingConf = "C:\Users\ytd_extdev_0903\incoming\ai.conf.cutover-8910"
$Root = "E:\wwwroot"
$NginxConf = "C:\nginx-1.18.0\myconf\ai.conf"
$Stamp = Get-Date -Format "yyyyMMdd-HHmmss"
$RelId = "admin-$Stamp"
$RelDist = Join-Path $Root "admin\releases\$RelId\dist"
$Current = Join-Path $Root "admin\current"

if (-not (Test-Path $IncomingZip)) { throw "missing $IncomingZip" }
if (-not (Test-Path $IncomingConf)) { throw "missing $IncomingConf" }

Write-Output "=== backup nginx ==="
Copy-Item $NginxConf "$NginxConf.bak-before-admin-$Stamp" -Force

Write-Output "=== install release dist ==="
New-Item -ItemType Directory -Force -Path $RelDist | Out-Null
Expand-Archive -Path $IncomingZip -DestinationPath $RelDist -Force
if (-not (Test-Path (Join-Path $RelDist "index.html"))) { throw "index.html missing" }

Write-Output "=== switch admin\\current junction ==="
if (Test-Path $Current) {
  cmd /c "rmdir `"$Current`"" | Out-Null
  if (Test-Path $Current) { Remove-Item $Current -Recurse -Force }
}
cmd /c "mklink /J `"$Current`" `"$RelDist`""
if (-not (Test-Path (Join-Path $Current "index.html"))) { throw "current index missing" }
Write-Output "CURRENT_OK=$Current -> $RelDist"

Write-Output "=== nginx conf no BOM ==="
$bytes = [System.IO.File]::ReadAllBytes($IncomingConf)
if ($bytes.Length -ge 3 -and $bytes[0] -eq 239 -and $bytes[1] -eq 187 -and $bytes[2] -eq 191) {
  $list = New-Object System.Collections.Generic.List[byte]
  for ($i = 3; $i -lt $bytes.Length; $i++) { [void]$list.Add($bytes[$i]) }
  $bytes = $list.ToArray()
}
[System.IO.File]::WriteAllBytes($NginxConf, $bytes)

Set-Location "C:\nginx-1.18.0"
& .\nginx.exe -t
if ($LASTEXITCODE -ne 0) { throw "nginx -t failed" }

Get-Process nginx -ErrorAction SilentlyContinue | Stop-Process -Force -ErrorAction SilentlyContinue
Start-Sleep -Seconds 1
try {
  Start-Service Nginx1.18 -ErrorAction Stop
  Write-Output "SERVICE_STARTED"
} catch {
  Start-Process -FilePath "C:\nginx-1.18.0\nginx.exe" -WorkingDirectory "C:\nginx-1.18.0" -WindowStyle Hidden
  Write-Output "EXE_STARTED"
}
Start-Sleep -Seconds 2
Write-Output "DONE"