#!/usr/bin/perl
# 
# This takes a URL (ftp, http or https) and downloads the file. If it is called without --url, it shows the 
# progress of any other instances currently downloading files.
# 
# Return codes:
# 0 = Normal exit.
# 1 = URL not found.
# 2 = The requested URL was not found on the remote server.
# 3 = The requested URL does not resolve to a known domain.
# 4 = The requested URL failed because the remote host refused the connection.
# 5 = The requested URL failed because there is no route to that host.
# 6 = Abort requested, but UUID or PID not passed
# 7 = The requested URL failed because the network is unreachable.
# 
# 
# TODO: 
# - 
# 
# NOTE:
# - 
# 

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

# 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();
$anvil->Log->level({set => 2});
$anvil->Log->secure({set => 1});


$anvil->data->{switches}{abort}      = "";
$anvil->data->{switches}{'job-uuid'} = "";
$anvil->data->{switches}{'save-to'}  = ""; 	# /mnt/shared/files by default
$anvil->data->{switches}{url}        = ""; 
$anvil->Get->switches;
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
	'switches::abort'    => $anvil->data->{switches}{abort},
	'switches::job-uuid' => $anvil->data->{switches}{'job-uuid'},
	'switches::save-to'  => $anvil->data->{switches}{'save-to'},
	'switches::url'      => $anvil->data->{switches}{url},
}});


if ($anvil->data->{switches}{abort})
{
	# Kill the other download
	abort_download($anvil);
}
elsif ($anvil->data->{switches}{url})
{
	# Try to download the file
	download_file($anvil);
}
else
{
	# Show the status of any downloading, finished, failed or aborted downloads.
	show_status($anvil);
}


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


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

sub abort_download
{
	my ($anvil) = @_;
	
	my $failed    =  0;
	my $url       =  $anvil->data->{switches}{url};
	my $file_name =  ($url =~ /^.*\/(.*)$/)[0];
	my $temp_file =  $anvil->data->{path}{directories}{shared}{temp}."/".$file;
	my $save_to   =  $anvil->data->{switches}{'save-to'} ? $anvil->data->{switches}{'save-to'} : $anvil->data->{path}{directories}{shared}{files};
	my $out_file  =  $save_to."/".$file;
	   $save_to   =~ s/\/\///g;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		url       => $url,
		file_name => $file_name, 
		temp_file => $temp_file, 
		save_to   => $save_to, 
	}});
	
	# Is this a supported protocol?
	if (($url !~ /^ftp\:\/\//) && ($url !~ /^http\:\/\//) && ($url !~ /^https\:\/\//))
	{
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 1, key => "log_0286", variables => { url => $url }});
		$anvil->nice_exit({exit_code => 1});
	}
	
	### NOTE: We don't use System->call because we need to track the output in real time.
	# Try to download it.
	my $bytes_downloaded = 0;
	my $downloaded       = 0;	# Bytes
	my $percent          = 0;
	my $rate             = 0;	# Bytes/sec
	my $time_left        = 0;	# Seconds
	my $running_time     = 0;
	my $shell_call       = $anvil->data->{path}{exe}{wget}." --continue --progress=dot:binary ".$url." --output-document ".$temp_file;
	open (my $file_handle, $shell_call." 2>&1 |") or $anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, secure => $secure, priority => "err", key => "log_0014", variables => { shell_call => $shell_call, error => $! }});
	while(<$file_handle>)
	{
		chomp;
		my $line = $anvil->Words->clean_spaces({ string => $_ });;
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 3, key => "log_0017", variables => { line => $line }});
		
		# Check for problems
		if (($line =~ /404/) && ($line =~ /Not Found/i))
		{
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 1, key => "log_0287", variables => { url => $url }});
			$failed = 2;
		}
		elsif ($line =~ /Name or service not known/i)
		{
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 1, key => "log_0288", variables => { url => $url }});
			$failed = 3;
		}
		elsif ($line =~ /Connection refused/i)
		{
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 1, key => "log_0289", variables => { url => $url }});
			$failed = 4;
		}
		elsif ($line =~ /route to host/i)
		{
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 1, key => "log_0290", variables => { url => $url }});
			$failed = 5;
		}
		elsif ($line =~ /Network is unreachable/i)
		{
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 1, key => "log_0291", variables => { url => $url }});
			$failed = 7;
		}
		elsif ($line =~ /^(\d+)K .*? (\d+)% (.*?) (\d+.*)$/)
		{
			$downloaded = $1;
			$percent    = $2;
			$rate       = $3;
			$time_left  = $4;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				downloaded => $url,
				percent    => $percent, 
				rate       => $rate, 
				time_left  => $time_left, 
			}});
			
			### NOTE: According to: http://savannah.gnu.org/bugs/index.php?22765, wget uses base-2.
			# Convert
			   $bytes_downloaded = $downloaded * 1024;
			my $say_downloaded   = $anvil->Convert->bytes_to_human_readable({'bytes' => $bytes_downloaded});
			my $say_percent      = $percent."%";
			my $byte_rate        = $anvil->Convert->human_readable_to_bytes({size => $rate, base2 => 1});
			my $say_rate         = $anvil->Convert->bytes_to_human_readable({'bytes' => $byte_rate})."/s";
			   $running_time     = time - $unix_start;
			my $say_running_time = $an->Readable->time({'time' => $running_time, process => 1});
			# Time left is a bit more complicated
			my $days    = 0;
			my $hours   = 0;
			my $minutes = 0;
			my $seconds = 0;
			if ($time_left =~ /(\d+)d/)
			{
				$days = $1;
				#print "$THIS_FILE ".__LINE__."; == days: [$days]\n";
			}
			if ($time_left =~ /(\d+)h/)
			{
				$hours = $1;
				#print "$THIS_FILE ".__LINE__."; == hours: [$hours]\n";
			}
			if ($time_left =~ /(\d+)m/)
			{
				$minutes = $1;
				#print "$THIS_FILE ".__LINE__."; == minutes: [$minutes]\n";
			}
			if ($time_left =~ /(\d+)s/)
			{
				$seconds = $1;
				#print "$THIS_FILE ".__LINE__."; == seconds: [$seconds]\n";
			}
			my $seconds_left     = (($days * 86400) + ($hours * 3600) + ($minutes * 60) + $seconds);
			my $say_time_left    = $an->Readable->time({'time' => $seconds_left, suffix => "long", process => 1});
			   $running_time     = 1 if not $running_time;
			   $average_rate     = int($bytes_downloaded / $running_time);
			my $say_average_rate = $anvil->Convert->bytes_to_human_readable({'bytes' => $average_rate})."/s";
			
			#print "$THIS_FILE ".__LINE__."; downloaded: [$downloaded], bytes_downloaded: [$bytes_downloaded], say_downloaded: [$say_downloaded], percent: [$percent], rate: [$rate], byte_rate: [$byte_rate], say_rate: [$say_rate], time_left: [$time_left]\n";
			if (time > $next_report)
			{
				#print "$THIS_FILE ".__LINE__."; say_downloaded: [$say_downloaded], percent: [$percent], say_rate: [$say_rate], running_time: [$running_time], say_running_time: [$say_running_time], seconds_left: [$seconds_left], say_time_left: [$say_time_left]\n";
				#print "$file; Downloaded: [$say_downloaded]/[$say_percent], Rate/Avg: [$say_rate]/[$say_average_rate], Running: [$say_running_time], Left: [$say_time_left]\n";
				#print "$THIS_FILE ".__LINE__."; bytes_downloaded=$bytes_downloaded, percent=$percent, current_rate=$byte_rate, average_rate=$average_rate, seconds_running=$running_time, seconds_left=$seconds_left, out_file=$out_file\n";
				$next_report += $report_interval;
				
				my $shell_call = $progress_file;
				$an->Log->entry({log_level => 3, message_key => "an_variables_0001", message_variables => {
					name1 => "shell_call", value1 => $shell_call, 
				}, file => $THIS_FILE, line => __LINE__});
				open (my $file_handle, ">$shell_call") or $an->Alert->error({title_key => "an_0003", message_key => "error_title_0015", message_variables => { shell_call => $shell_call, error => $! }, code => 2, file => $THIS_FILE, line => __LINE__});
				print $file_handle "uuid=$uuid bytes_downloaded=$bytes_downloaded percent=$percent current_rate=$byte_rate average_rate=$average_rate seconds_running=$running_time seconds_left=$seconds_left url=$url out_file=$out_file\n";
				close $file_handle;
			}
		}
	}
	close $file_handle;
	
	
	
	return(0);
}

sub download_file
{
	my ($anvil) = @_;
	

	
	return(0);
}

# Show the status of any downloading, finished, failed or aborted downloads.
sub show_status
{
	my ($anvil) = @_;
	

	
	return(0);
}