#
    # AWS PowerOn/Off Schedular
    # Tag Name: Power_Options
    # Tag values: PowerOn,Mon:5,Tue:5,Wed:6,Thu:6,Fri:6,Sat:6,Sun:6;PowerOff,Mon:18,Tue:18,Wed:22,Thu:18,Fri:18,Sat:19,Sun:19;Notify,user_example@example.com,user_example2@example.com
    #
    # Requires AWS plugin: https://aws.amazon.com/powershell/
    # Set-AWSCredentials -AccessKey <access key> -SecretKey <secret key> -Storeas <profile name>
    # Full instructions found http://i-script-stuff.electric-horizons.com/
    #
    #


    #profiles to check
    $profile_list = ("Example_1")



    $from = "helpdesk@example.com"
    #SMTP server to use
    $smtp = "mail.example.com"
    $smtp_port = "25"

    #Just a quick check for powershell 3.0 and older changes the method of plugin loading.
    if($PSVersionTable.PSVersion.Major -ge 4) {
    Import-Module AWSPowerShell
    } else {
    Import-Module "C:\Program Files (x86)\AWS Tools\PowerShell\AWSPowerShell\AWSPowerShell.psd1"
    }

    #converts AWS tag into an object and notes if an action should happen or not.
    function action_object($power_options) {
    $power_procedure = $power_options -split(";")
    $Notify = $Null
    $PowerOn = $False
    $PowerOff = $False

        foreach($procedure in $power_procedure) {
        $action_queue = $procedure -split ","
            switch -case ($action_queue[0]) {
                "PowerOn" {
                    for($i=1;$i -le ($action_queue.count); $i++) {
                        if(time_action $action_queue[$i]) {
                        $PowerOn = $True
                        }
                    }
                }

                "PowerOff" {
                    for($i=1;$i -le ($action_queue.count); $i++) {
                        if(time_action $action_queue[$i]) {
                        $PowerOff = $True
                        }
                    }
                }

                "Notify" {
                    for($i=1;$i -le ($action_queue.count); $i++) {
                        if($action_queue[$i]) {

                        $Notify += $action_queue[$i] + ","
                        }
                    }
                $Notify = $Notify.Substring(0,$Notify.Length-1)
                }

            }
        }

    $Object = @{
    PowerOn = $PowerOn
    PowerOff =  $PowerOff
    Notify = $Notify
    }

    return $Object
    }

    #Parses the time segment of the AWS tag and returns true or false normally only called in action_object
    function time_action($action_options) {
    $action_timing = $action_options -split ":"
    $day = Get-date -format ddd
    $hour = get-date -format HH

        if(($action_timing[0] -like $day) -and ($action_timing[1] -like $hour)){
        return $true
        } elseif (($action_timing[0] -like "weekday") -and ($action_timing[1] -like $hour) -and (($day -notlike "Sat") -and ($day -notlike "Sun"))) {
        return $true
        } elseif (($action_timing[0] -like "allweek") -and ($action_timing[1] -like $hour)) {
        return $true
        } elseif (($action_timing[0] -like "weekend") -and ($action_timing[1] -like $hour) -and (($day -like "Sat") -and ($day -like "Sun"))) {
        return $true
        } else {
        return $false
        }
    }


    #Actual Engine.
    #Parses through profiles and regions.
    foreach($profile in $profile_list) {
    Set-AWSCredentials -ProfileName $profile
    $region_list = Get-AWSRegion | select -expandproperty Region

        foreach($region in $region_list) {
        $Instance_list = Get-EC2Instance -region $region |select -expandproperty instances

        $VPC_list = Get-EC2Vpc -Region $region
            foreach ($VPC in $VPC_list) {
                $Instance_list | Where-Object {$_.VpcId -eq $VPC.VpcId} | foreach-object {
                $Instance_name = ($_.Tags | Where-Object {$_.Key -eq 'Name'}).Value
                $power_Action = $NULL
                    if($Power_Options = ($_.Tags | Where-Object {$_.Key -eq 'Power_Options'}).Value) {
                    $power_action = action_object $Power_Options
                    }

                    if(($power_action.PowerOff)) {
                        $subject_power_off = "Scheduled PowerOff of $instance_name has begun"
                        $body_power_off = "The EC2 instance $instance_name has started"
                        if($power_action.Notify) {
                        Stop-EC2Instance -InstanceId $_.InstanceId -Region $region
                        Send-MailMessage -from $from -To $power_action.Notify -Subject $subject_power_off -bodyashtml($body_power_off) -smtpServer "$smtp" -port "$smtp_port"
                        } else {
                        Stop-EC2Instance -InstanceId $_.InstanceId -Region $region
                        }
                    }

                    if(($power_action.PowerON)) {
                    #Email Messages to send
                    $subject_power_on = "Scheduled PowerOn of $instance_name has started"
                    $body_power_on = "The EC2 instance $instance_name has started"
                        if($power_action.Notify) {
                        Start-EC2Instance -InstanceId $_.InstanceId -Region $region
                        Send-MailMessage -from $from -To $power_action.Notify -Subject $subject_power_on -bodyashtml($body_power_on) -smtpServer "$smtp" -port "$smtp_port"
                        } else {
                        Start-EC2Instance -InstanceId $_.InstanceId -Region $region
                        }
                    }
                }
            }
        }
    }