# Install test agent on server and cut over Nginx wecom callback to 8910
$ErrorActionPreference = "Stop"
$ReleaseId = "scaffold-agent-" + (Get-Date -Format "yyyyMMdd-HHmmss")
$Root = "E:\wwwroot"
$Release = Join-Path $Root "agent\releases\$ReleaseId"
$AgentCurrent = Join-Path $Root "agent\current"
$Python = "C:\yutongda\tools\Python312\python.exe"
$Nginx = "C:\nginx-1.18.0"
$Zip = "C:\Users\ytd_extdev_0903\incoming\agent-release.zip"
$EnvSrc = "C:\Users\ytd_extdev_0903\incoming\env.file"
$AiConfNew = "C:\Users\ytd_extdev_0903\incoming\ai.conf.cutover-8910"

Write-Output "=== create dirs ==="
New-Item -ItemType Directory -Force -Path $Release, "$Root\logs", "$Root\ops", "$Root\admin\releases", "$Root\agent\releases", "C:\Users\ytd_extdev_0903\incoming" | Out-Null
if (-not (Test-Path $Zip)) { throw "missing $Zip" }
if (-not (Test-Path $Python)) { throw "missing $Python" }

Write-Output "=== expand release ==="
Expand-Archive -Path $Zip -DestinationPath $Release -Force
$AgentHome = Join-Path $Release "agent"
if (-not (Test-Path (Join-Path $AgentHome "agent\http_app.py"))) {
  throw "http_app.py not found under $AgentHome"
}
Write-Output "AgentHome=$AgentHome"

Write-Output "=== env ==="
Copy-Item $EnvSrc (Join-Path $Root ".env") -Force
Copy-Item $EnvSrc (Join-Path $Release ".env") -Force
Copy-Item $EnvSrc (Join-Path $AgentHome ".env") -Force

Write-Output "=== venv + pip ==="
$venvDir = Join-Path $AgentHome ".venv"
$venvPy = Join-Path $venvDir "Scripts\python.exe"
$venvPip = Join-Path $venvDir "Scripts\pip.exe"
if (-not (Test-Path $venvPy)) {
  & $Python -m venv $venvDir
  if ($LASTEXITCODE -ne 0) { throw "venv failed" }
}
& $venvPip install --default-timeout=180 -i https://pypi.tuna.tsinghua.edu.cn/simple -r (Join-Path $AgentHome "requirements.txt")
if ($LASTEXITCODE -ne 0) { throw "pip install failed" }

Write-Output "=== switch agent\\current junction ==="
if (Test-Path $AgentCurrent) {
  cmd /c "rmdir `"$AgentCurrent`"" | Out-Null
  if (Test-Path $AgentCurrent) { Remove-Item $AgentCurrent -Recurse -Force }
}
cmd /c "mklink /J `"$AgentCurrent`" `"$AgentHome`""
if (-not (Test-Path (Join-Path $AgentCurrent "agent\http_app.py"))) { throw "agent current missing http_app" }

Write-Output "=== stop old listener 8910 ==="
Get-NetTCPConnection -LocalPort 8910 -ErrorAction SilentlyContinue |
  Select-Object -ExpandProperty OwningProcess -Unique |
  ForEach-Object { Stop-Process -Id $_ -Force -ErrorAction SilentlyContinue }
Start-Sleep -Seconds 1

Write-Output "=== write run-agent-http.cmd ==="
$runCmd = @"
@echo off
cd /d "$AgentCurrent"
set YTD_ENV=test
set AGENT_HTTP_PORT=8910
:loop
"$AgentCurrent\.venv\Scripts\python.exe" -m agent.http_app >> "$Root\logs\agent-http.out.log" 2>> "$Root\logs\agent-http.err.log"
echo agent exited, restart in 3s >> "$Root\logs\agent-http.err.log"
timeout /t 3 /nobreak >nul
goto loop
"@
Set-Content -Path (Join-Path $Root "ops\run-agent-http.cmd") -Value $runCmd -Encoding ASCII

Write-Output "=== start agent via WMI ==="
$wmi = Invoke-CimMethod -ClassName Win32_Process -MethodName Create -Arguments @{
  CommandLine = "cmd.exe /c `"$(Join-Path $Root 'ops\run-agent-http.cmd')`""
}
Write-Output "WMI_Return=$($wmi.ReturnValue) ProcessId=$($wmi.ProcessId)"
Start-Sleep -Seconds 6
try {
  $h = Invoke-WebRequest -Uri "http://127.0.0.1:8910/health" -UseBasicParsing -TimeoutSec 8
  Write-Output "HEALTH=$($h.StatusCode) $($h.Content)"
} catch {
  Get-Content (Join-Path $Root "logs\agent-http.err.log") -Tail 50 -ErrorAction SilentlyContinue
  throw "agent health failed: $_"
}

$listenPid = 0
$listen = Get-NetTCPConnection -LocalPort 8910 -State Listen -ErrorAction SilentlyContinue | Select-Object -First 1
if ($listen) { $listenPid = $listen.OwningProcess }

Write-Output "=== pointer ==="
@{
  root = $Root
  releaseId = $ReleaseId
  releaseRoot = $Release
  agentHome = $AgentHome
  agentCurrent = $AgentCurrent
  adminCurrent = (Join-Path $Root "admin\current")
  pid = $listenPid
  updatedAt = (Get-Date).ToString("o")
} | ConvertTo-Json | Set-Content (Join-Path $Root "ops\active-release.json") -Encoding UTF8

Write-Output "=== nginx cutover (no BOM, hard restart) ==="
$ai = Join-Path $Nginx "myconf\ai.conf"
$bak = Join-Path $Nginx ("myconf\ai.conf.bak-before-cutover-" + (Get-Date -Format "yyyyMMdd-HHmmss"))
Copy-Item $ai $bak -Force
$bytes = [System.IO.File]::ReadAllBytes($AiConfNew)
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 = $list.ToArray()
}
[System.IO.File]::WriteAllBytes($ai, $bytes)
$old = Get-Location
Set-Location $Nginx
& .\nginx.exe -t
if ($LASTEXITCODE -ne 0) {
  Copy-Item $bak $ai -Force
  Set-Location $old
  throw "nginx -t failed, restored"
}
Get-Process nginx -ErrorAction SilentlyContinue | Stop-Process -Force -ErrorAction SilentlyContinue
Start-Sleep -Seconds 1
try { Start-Service Nginx1.18 -ErrorAction Stop } catch {
  Start-Process -FilePath (Join-Path $Nginx "nginx.exe") -WorkingDirectory $Nginx -WindowStyle Hidden
}
Set-Location $old
Write-Output "NGINX_RESTARTED bak=$bak"
Write-Output "DONE release=$ReleaseId"