#!/usr/bin/perl
# 
# This manages power on the host. It can set that a reboot is or is no longer required. It can also reboot or
# power off the machine. 
# 
# Examples;
# - Mark that a reboot is required           - anvil-manage-power --reboot-needed 1
# - Clear that a reboot is needed            - anvil-manage-power --reboot-needed 0
# - Report whether a reboot is needed or not - anvil-manage-power
# - Reboot the system                        - anvil-manage-power --reboot [-y]
# - Power the system off                     - anvil-manage-power --poweroff [-y]
# 
# Exit codes;
# 0 = Normal exit.
# 1 = No database connections available.
# 
# TODO: Don't reboot or power off until all external users are done with the database on this system (if 
#       applicable)
# 

use strict;
use warnings;
use Anvil::Tools;

# Disable buffering
$| = 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({log_level => 2, log_secure => 1});

$anvil->Storage->read_config({file => "/etc/anvil/anvil.conf"});

# Read switches
$anvil->data->{switches}{'poweroff'}      = "";
$anvil->data->{switches}{'power-off'}     = "";
$anvil->data->{switches}{'reboot'}        = "";
$anvil->data->{switches}{'y'}             = "";
$anvil->data->{switches}{'yes'}           = "";
$anvil->data->{switches}{'reboot-needed'} = "";
$anvil->data->{switches}{'job-uuid'}      = "";
$anvil->Get->switches;

if ($anvil->data->{switches}{'power-off'})
{
	$anvil->data->{switches}{'poweroff'} = 1;
}
if ($anvil->data->{switches}{'yes'})
{
	$anvil->data->{switches}{'y'} = 1;
}

# Connect to DBs.
$anvil->Database->connect;
$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 3, secure => 0, key => "log_0132"});
if (not $anvil->data->{sys}{database}{connections})
{
	# No databases, exit.
	print $anvil->Words->string({key => "error_0003"})."\n";
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, secure => 0, key => "error_0003"});
	$anvil->nice_exit({exit_code => 1});
}

# Are we being asked to reboot or power off?
if ($anvil->data->{switches}{'reboot'})
{
	# Did the user confirm?
	if ($anvil->data->{switches}{'reboot'} =~ /^y/i)
	{
		do_poweroff($anvil, "reboot");
	}
	else
	{
		# Not yet, ask to confirm.
		print $anvil->Words->string({key => "message_0059"})." ";
		my $answer = <STDIN>;
		chomp($answer);
		if ($answer =~ /^y/i)
		{
			do_poweroff($anvil, "reboot");
		}
		else
		{
			# Abort and exit.
			print $anvil->Words->string({key => "message_0061"})."\n";
			$anvil->nice_exit({exit_code => 0});
		}
	}
}
if ($anvil->data->{switches}{'poweroff'})
{
	# Did the user confirm?
	if ($anvil->data->{switches}{'poweroff'} =~ /^y/i)
	{
		do_poweroff($anvil, "poweroff");
	}
	else
	{
		# Not yet, ask to confirm.
		print $anvil->Words->string({key => "message_0060"})." ";
		my $answer = <STDIN>;
		chomp($answer);
		if ($answer =~ /^y/i)
		{
			do_poweroff($anvil, "poweroff");
		}
		else
		{
			# Abort and exit.
			print $anvil->Words->string({key => "message_0061"})."\n";
			$anvil->nice_exit({exit_code => 0});
		}
	}
}

my $reboot_needed = $anvil->System->reboot_needed({debug => 2});
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { reboot_needed => $reboot_needed }});

$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { "switches::reboot-needed" => $anvil->data->{switches}{'reboot-needed'} }});
if ($anvil->data->{switches}{'reboot-needed'} eq "1")
{
	# Enable
	if (not $reboot_needed)
	{
		$reboot_needed = $anvil->System->reboot_needed({set => 1});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { reboot_needed => $reboot_needed }});
		print $anvil->Words->string({key => "message_0048"})."\n";
	}
	else
	{
		# Was already set, do nothing
		print $anvil->Words->string({key => "message_0049"})."\n";
	}
}
elsif ($anvil->data->{switches}{'reboot-needed'} eq "0")
{
	# Disabled
	if ($reboot_needed)
	{
		$reboot_needed = $anvil->System->reboot_needed({set => 0});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { reboot_needed => $reboot_needed }});
		print $anvil->Words->string({key => "message_0050"})."\n";
	}
	else
	{
		# Was already disabled, do nothing
		print $anvil->Words->string({key => "message_0051"})."\n";
	}
}
elsif ($anvil->data->{switches}{'reboot-needed'})
{
	# Bad call
	print $anvil->Words->string({key => "message_0052", variables => { program => $THIS_FILE }})."\n";
}

# Get the current state
if ($reboot_needed)
{
	# Report that we're in mainteance mode
	print $anvil->Words->string({key => "message_0053"})."\n";
}
else
{
	# Report that we're not.
	print $anvil->Words->string({key => "message_0054"})."\n";
}

# We're done
$anvil->nice_exit({exit_code => 0});


#############################################################################################################
# Private functions.                                                                                        #
#############################################################################################################

# This does a reboot, clearing the flag indicating a reboot is required in the process.
sub do_poweroff
{
	my ($anvil, $task) = @_;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { task => $task }});
	
	my $say_task = $task eq "poweroff" ? "message_0062" : "message_0063";
	print $anvil->Words->string({key => $say_task})."\n";
	
	# Clear the "reboot needed" flag.
	$reboot_needed = $anvil->System->reboot_needed({set => 0});
	
	# Set the progress to '50%' (anvil-daemon will set it to 100% when it starts post-boot).
	
	$anvil->nice_exit({exit_code => 0});
}