# Get header setup to connect and make requests.  This leverages credential assets already in Azure
[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType] 'Tls12'
$cred = Get-AutomationPSCredential -Name 'Skytap-cred'
$content = 'application/json'
$baseAuth = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $cred.UserName, $cred.GetNetworkCredential().Password)))
$header =  @{"Accept" = $content; Authorization=("Basic {0}" -f $baseAuth); "Content_type" = $content}
$uri = 'https://cloud.skytap.com/'

# Connect to Skytap
Invoke-RestMethod -uri $uri -Headers $header -Method GET -sessionvariable session

# Get environment ID from variables
$env_to_backup = Get-AutomationVariable -Name 'env_to_backup'
$target_region = Get-AutomationVariable -Name 'target_region'
$delay = Get-AutomationVariable -Name 'Sleeptime'
$today = get-date -format o
$project_name = "DR plan for environment " + $env_to_backup

#Simplifies get requests to system.  
Function get_skytap ($r) {
    $path = if($r -match $uri){$r} else { $uri + $r}
	$result = Invoke-RestMethod -uri $path -WebSession $session 
	return, $result
}
#Simplifies setting things like environment runstate, adding vm, etc.
Function set_skytap ($pth, $jsn, $method) {
    $path = if($pth -match $uri){$pth} else {$uri + $pth}
    $json = $jsn | convertto-json
    $action = if($method -ne $null){$method} else {'POST'}
   	Invoke-RestMethod -uri $path -WebSession $session -Method $action -body $json -ContentType $content
}

#check for runstate
Function busyness ($b){
	$i = 0
	$check = get_skytap $b
	while($i -ne 3 -and $check.busy -ne $null){
		write-output 'inside while'
		$i++
		$check = get_skytap $b
		sleep $delay
	}
	return, $check
}

$environment_source = get_skytap "configurations/$($env_to_backup)"

# Get or create a project for organization and identifying templates that are a part of the backup process.
$project_check = (get_skytap 'projects?scope=company' | % {$_}) | ? {$_.name -like $project_name}
$project = if($null -eq $project_check){
	set_skytap  'projects.json' @{"name"= $project_name}
} else {$project_check}
$project_templates = $project.url + '/templates/'
write-output $project_templates

# Write json to request template creation
$create_template_json = @{
    "configuration_id"= $environment_source.id;
	"name"= "$($environment_source.name) $($today)";
    "publish_sets"= 'true';
    "live_copy" = 'true'
}

# Create template 
$create_template = set_skytap 'templates.json' $create_template_json

# If template in a busy state, it won't copy
if((get_skytap $create_template.url).busy -ne $null ){ 
	busyness $create_template.url
}

# Write json to request copy template override notice about suspend state of vm
$copytoregion_json = @{
    "template_id"= $create_template.id;
    "target_region"= $target_region;
	"name"= $create_template.name;
	"copy_to_region_vm_status_override" = 'true'
}

# Copy template
$template_copy = set_skytap 'templates.json' $copytoregion_json

# Delete target region older templates.  But only the ones in the DR project
if($null -ne $template_copy.id){
	$target_site_templates = get_skytap $project_templates 
	
	# Write json to delete older versions of template
	$multiselect_json = @{"multiselect"= @($target_site_templates.id)}
	write-output $multiselect_json
	# Destroy template(s)
	set_skytap 'templates/destroy_multiple.json' $multiselect_json DELETE

	# Add the new templates to project
	set_skytap ($project_templates + $template_copy.id)
	set_skytap ($project_templates + $create_template.id)
}