<#
    Send Slack Notification in Disk gets below 20%
    Send Slack Notification in any of the  gets below 20%
#>


Function SlackDiskReport {
    param(
        [Parameter(Mandatory, ValueFromPipeLine)]
        $disk
    )

    process {
        $percentageFree = [Math]::round((($disk.freespace/$disk.size) * 100))
        $freeGB = [math]::round($disk.freespace /1Gb, 0)

        if ($percentageFree -lt 21) {

            $color= 'good'
            if ($percentageFree -lt 20) {
                $color = 'warning'
            }

            if ($percentageFree -lt 10) {
                $color = 'danger'
            }

            $msg = "{0} has {1}% free disk space ({2} GB)" -f $Env:COMPUTERNAME, $percentageFree, $freeGB

            $attachment = @{
                'title' =  'Disk space warning'
                'color' = $color
                'fallback' =  $msg
                'text' =  $msg
            }

            $report = @{'attachments' = @($attachment)}

            $body = ConvertTo-Json -Depth 10 -InputObject $report
            IWR -UseBasicParsing -Uri $url -Body $body -Method Post
        }
    }
}

Function FilterServicesByPrefix {
    param (
        [Parameter(Mandatory, ValueFromPipeLine)]
        [System.ServiceProcess.ServiceController] $service,

        [Parameter(Mandatory)]
        [ValidateCount(1, 1000000)]
        [string[]] $prefix
    )

    process {
        $prefix | % { if ( $service.name -match "^$_") { return $service }}
    }
}

Function SlackServiceReport {
    param(
        [Parameter(Mandatory, ValueFromPipeLine)]
        [System.ServiceProcess.ServiceController] $service
    )

    process {

        if (($service.Status -ne "Running") -and ($service.StartType -eq "Automatic" )) {

            $attachment = @{
                'title' =  $service.Name
                'color' = 'danger'
                'fallback' = $service.Name + " is " + $service.Status.ToString()
                'text' =  $service.Name + " is " + $service.Status.ToString()
            }

            $report = @{'attachments' = @($attachment)}

            $body = ConvertTo-Json -Depth 10 -InputObject $report
            IWR -UseBasicParsing -Uri $url -Body $body -Method Post
        }
    }
}

$url =  Get-Content -Path 'C:\Monitron\slackwebhookurl.txt'
Get-Service | FilterServicesByPrefix -prefix @("particular", "nservicebus", "website.backend") | SendServiceReport
Get-WmiObject -class Win32_logicalDisk -Filter "DeviceID='C:'" | SendDiskReport