Write-Host
Write-Host "［情報］Azure VM の状態" -ForeGroundColor Cyan
Write-Host

# アクセストークンの取得
$clientid = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
$clientsecret = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
$subscriptionid = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
$tenantid = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
$resource = "https://management.azure.com/"
$tokenendpoint = "https://login.microsoftonline.com/$tenantid/oauth2/token"
$body = @{
    grant_type    = "client_credentials"
    resource      = $resource
    client_id     = $clientid
    client_secret = $clientsecret
}
$tokenresponse = Invoke-RestMethod -Method Post -Uri $tokenendpoint -Body $body -ContentType "application/x-www-form-urlencoded"
$accesstoken = $tokenresponse.access_token

# Azure VMの一覧
# Azure REST API: Virtual Machines - List
# https://learn.microsoft.com/en-us/rest/api/compute/virtual-machines/list
# GET https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachines?api-version=2025-04-01

$headers = @{
    'Authorization' = "Bearer $accesstoken"
    'Content-Type'  = 'application/json'
}
$requesturi  = "https://management.azure.com/subscriptions/$subscriptionid/providers/Microsoft.Compute/virtualMachines?api-version=2024-07-01"
$ret = (Invoke-RestMethod -Uri $requesturi -Headers $headers -Method Get)
$vms = $ret.value | ForEach-Object {
    [pscustomobject]@{
        Name     = $_.name
        id = $_.id
    }
}

# VMの状態の取得
# Azure REST API: Virtual Machines - Instance View
# https://learn.microsoft.com/en-us/rest/api/compute/virtual-machines/instance-view
# GET https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachines/{vmName}/instanceView?api-version=2025-04-01

$results = foreach ($vm in $vms) {

  $requesturi = "https://management.azure.com$($vm.id)/instanceView?api-version=2025-04-01"
  $ret = Invoke-RestMethod -Uri $requesturi -Headers $headers -Method Get

  $ps = $ret.statuses | Where-Object { $_.code -like 'PowerState/*' } | Select-Object -First 1

  [pscustomobject]@{
    Name         = $vm.Name
    PowerState   = $ps.code
    DisplayStatus= $ps.displayStatus
  }
}

$results