#!/usr/bin/perl
# 
# Accepts a HTTP PUT request to power ON or OFF a specified host.
# 

use strict;
use warnings;
use Anvil::Tools;
use Data::Dumper;
use JSON;

$| = 1;

my $THIS_FILE           =  ($0 =~ /^.*\/(.*)$/)[0];
my $running_directory   =  ($0 =~ /^(.*?)\/$THIS_FILE$/)[0];
if (($running_directory =~ /^\./) && ($ENV{PWD}))
{
	$running_directory =~ s/^\./$ENV{PWD}/;
}

my $anvil = Anvil::Tools->new();

sub handle_invalid_uuid
{
	my $parameters = shift;
	my $name       = $parameters->{name};
	my $uuid       = $parameters->{uuid};

	$anvil->Log->entry({
		source    => $THIS_FILE,
		line      => __LINE__,
		level     => 0,
		'print'   => 1,
		priority  => "err",
		key       => "error_0160",
		variables => { name => $name, uuid => $uuid }
	});
	$anvil->nice_exit({ exit_code => 1 });
}

sub set_anvil_power
{
	# Expects the first element of @_ (argument array) to be a hash.
	my $parameters = shift;
	my $anvil_uuid = $parameters->{anvil_uuid};
	my $on         = $parameters->{on};

	# Get all mandatory hosts inside the anvil identified by the given UUID.
	my @host_uuids = (
		$anvil->data->{anvils}{anvil_uuid}{$anvil_uuid}{anvil_node1_host_uuid},
		$anvil->data->{anvils}{anvil_uuid}{$anvil_uuid}{anvil_node2_host_uuid}
	);

	# Check for DR host outside of the loop to avoid duplicating checks.
	if (length($anvil->data->{anvils}{anvil_uuid}{$anvil_uuid}{anvil_dr1_host_uuid}))
	{
		push(@host_uuids, $anvil->data->{anvils}{anvil_uuid}{$anvil_uuid}{anvil_dr1_host_uuid});
	}

	foreach (@host_uuids)
	{
		set_host_power({ host_uuid => $_, on => $on, stop_servers => 1 });
	}
}

sub set_host_power
{
	# Expects the first element of @_ (argument array) to be a hash.
	my $parameters   = shift;
	my $host_uuid    = $parameters->{host_uuid};
	my $on           = $parameters->{on};
	my $stop_servers = exists $parameters->{stop_servers} ? "--stop-servers" : "";

	# Check the host's status before trying to power it up/down.
	my $is_host_on = $anvil->data->{hosts}{host_uuid}{$host_uuid}{host_status} eq "online" ? 1 : 0;

	$anvil->Log->variables({
		source => $THIS_FILE,
		line   => __LINE__,
		level  => 2,
		list   => {
			host_uuid  => $host_uuid,
			is_host_on => $is_host_on,
			on         => $on
		}
	});

	# When host is ON and request is to power OFF.
	#
	# Power OFF should invoke anvil-safe-stop on a host.
	if ($is_host_on && not $on)
	{
		$anvil->Database->insert_or_update_jobs({
			job_command     => $anvil->data->{path}{exe}{'anvil-safe-stop'}." --power-off ".$stop_servers,
			job_host_uuid   => $host_uuid,
			job_description => "job_0333",
			job_name        => "cgi-bin::set_power::off",
			job_progress    => 0,
			job_title       => "job_0332"
		});
	}
	# When host is OFF and request is to power ON.
	#
	# Power ON should invoke striker-boot-machine on this striker.
	elsif (not $is_host_on && $on)
	{
		$anvil->Database->insert_or_update_jobs({
			job_command     => $anvil->data->{path}{directories}{tools}."/striker-boot-machine --host-uuid ".$host_uuid,
			job_description => "job_0335",
			job_name        => "cgi-bin::set_power::on",
			job_progress    => 0,
			job_title       => "job_0334"
		});
	}
}

$anvil->Get->switches;

$anvil->Database->connect;
$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, secure => 0, key => "log_0132"});
if (not $anvil->data->{sys}{database}{connections})
{
	# No databases, exit.
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, 'print' => 1, priority => "err", key => "error_0003"});
	$anvil->nice_exit({exit_code => 1});
}

# Read in any CGI variables, if needed.
$anvil->Get->cgi();

$anvil->Database->get_hosts();
$anvil->Database->get_anvils();

print $anvil->Template->get({file => "shared.html", name => "json_headers", show_name => 0})."\n";

my $response_body = {};

# Decode request body (JSON string) to a hash.
#
# Note: requests made with the PUT method won't have query params.
my $request_body;

my $is_decode_json_success = eval {
	$request_body = decode_json($anvil->data->{cgi}{PUTDATA}{value});
};

if (not $is_decode_json_success)
{
	$anvil->Log->entry({
		source    => $THIS_FILE,
		line      => __LINE__,
		level     => 0,
		'print'   => 1,
		priority  => "err",
		key       => "error_0304",
		variables => { request_body_string => $anvil->data->{cgi}{PUTDATA}{value}, json_decode_error => $_ }
	});
}

my $anvil_uuid               = exists $request_body->{anvil_uuid} ? $request_body->{anvil_uuid} : $anvil->data->{switches}{'anvil-uuid'};
my $host_uuid                = exists $request_body->{host_uuid}  ? $request_body->{host_uuid}  : $anvil->data->{switches}{'host-uuid'};
my $is_on                    = exists $request_body->{is_on}      ? $request_body->{is_on}      : $anvil->data->{switches}{'is-on'};
my $anvil_uuid_variable_name = "anvil UUID";
my $host_uuid_variable_name  = "host UUID";

$anvil->Log->variables({
	source => $THIS_FILE,
	line   => __LINE__,
	level  => 2,
	list   => {
		anvil_uuid => $anvil_uuid,
		host_uuid  => $host_uuid,
		is_on      => $is_on
	}
});

if ($anvil_uuid)
{
	if (exists $anvil->data->{anvils}{anvil_uuid}{$anvil_uuid})
	{
		set_anvil_power({ anvil_uuid => $anvil_uuid, on => $is_on });
	}
	else
	{
		handle_invalid_uuid({ name => $anvil_uuid_variable_name, uuid => $anvil_uuid });
	}
}
elsif ($host_uuid)
{
	if (exists $anvil->data->{hosts}{host_uuid}{$host_uuid})
	{
		set_host_power({ host_uuid => $host_uuid, on => $is_on });
	}
	else
	{
		handle_invalid_uuid({ name => $host_uuid_variable_name, uuid => $host_uuid });
	}
}

print JSON->new->utf8->encode($response_body)."\n";