$user = "xx"
$pass = "xx"
$uri  = "https://xx.yy.zz.com/otrs/nph-genericinterface.pl/Webservice"

$headers = @{}
$headers.Add("Accept", "application/json")
$headers.Add("Content-Type", "application/json")

# Get Session
$LoginDetails = @{
	UserLogin = $user
	Password  = $pass
}
$json = $LoginDetails | ConvertTo-Json
$response = Invoke-RestMethod -Method Post -Headers $Headers -ContentType 'application/json' -Uri "$uri/CMDB/Session" -Body $json
if ( $response.Error ) {
	$code = $response.Error.ErrorCode
	$message = $response.Error.ErrorMessage
	Write-Host "Creating session failed (${code}: $message)"
	exit 1
	
}
$SessionID = $response.SessionID

$Today = Get-Date -Format "yyyy-MM-dd"

# Which classes to check
$Classes = @("Computer")
foreach ( $Class in $Classes ) {
	Write-Host Search for ConfigItems of class $Class

	# Search ConfigItems
	# Parameter see https://github.com/OTRS/ITSMConfigurationManagement/blob/rel-6_0/Kernel/GenericInterface/Operation/ConfigItem/ConfigItemSearch.pm#L125
	$SearchParameter = @{
		SessionID = $SessionID
		ConfigItem = @{
			Class = $Class
			Limit = 10000
			DeplStates = @(
				"Production"
			)
		}
	}
	$json = $SearchParameter | ConvertTo-Json -Depth 3
	$response = Invoke-RestMethod -Method Post -Headers $Headers -Uri "$uri/CMDB/ConfigItem" -Body $json
	if ( $response.Error ) {
		$code = $response.Error.ErrorCode
		$message = $response.Error.ErrorMessage
		Write-Host "Search for ConfigItems failed (${code}: $message)"
		exit 1	
	}
	
	# next iteration of no CIs found
	if ( !$response.ConfigItemIDs ) {
		continue
	}

	$ConfigItemIDs = $response.ConfigItemIDs
	foreach ( $ConfigItemID in $ConfigItemIDs) {
		Write-Host Fetching ConfigItem with ID $ConfigItemID
		$response = Invoke-RestMethod -Method Get -Headers $Headers -Uri "$uri/CMDB/ConfigItem/${ConfigItemID}?SessionID=${SessionID}" 
		if ( $response.Error ) {
			$code = $response.Error.ErrorCode
			$message = $response.Error.ErrorMessage
			Write-Host "Get ConfigItems with id $ConfigItemID failed (${code}: $message)"
			continue
		}
		$ConfigItem = $response.ConfigItem
		Write-Host -NoNewLine CI $ConfigItem.Number ($ConfigItem.Name) "is "
		if ( $ConfigItem.CIXMLData.WarrantyExpirationDate -le $Today ) {
			Write-Host expired
			$UpdatedCI = @{
				SessionID    = $SessionID
				ConfigItemID = $ConfigItemID
				ConfigItem = @{
					Class     = $Class
					Name      = $ConfigItem.Name
					DeplState = "Expired"
					InciState = $ConfigItem.InciState
					CIXMLData = $ConfigItem.CIXMLData
				}
			}
			$json = $UpdatedCI | ConvertTo-Json -Depth 5
			$response = Invoke-RestMethod -Method Post -Headers $Headers -Uri "$uri/CMDB/ConfigItem/${ConfigItemID}" -Body $json
			if ( $response.Error ) {
				$code = $response.Error.ErrorCode
				$message = $response.Error.ErrorMessage
				Write-Host "Seettig ConfigItems with id $ConfigItemID to eexpired failed (${code}: $message)"
				continue
			}
		} else {
			Write-Host not expired
		}
	}
}