#!/usr/bin/perl
# 
# This handles moving around and managing files on Anvil! nodes, DR hosts and Striker dashboards.
# 
# When this is called (periodically by the daemon of after an upload / ISO generation);
# - 1. Check 'incoming/' for files. For any found, generate an md5sum and see if the file name and sum match 
#      anything in the database from any host;
#      - If so, update/add an entry in 'file_locations'
#      - If not, create a new entry in 'files' and then add the first entry in 'file_locations'
# - 2. Check 'file_locations' for any files on this system, and verify they exist still. 
#      - If not, check the other files for one with a matching md5sum. If found, handle as a rename.
#      - If not found at all, search for the file according to the search rules and copy to here if found.
#      - If not found anywhere, remove it from 'file_locations' and send an alert.
#      - If found, check the size. If it differs, recalculate the md5sum.
# - 3. If called with '--rename --file <filename> --to <newname>', rename the file and update 'files'.
# - 4. If called with '--delete', remove from 'file_locations' and then remove from the local storage. If 
#      also used with '--everywhere', then all copies on all systems we know about will be deleted. This is 
#      done by registering a job against all known hosts. As such, if this is called and the target file 
#      doesn't exist, it just clears the job and then exits.
# - 5. If called with '--is-script=[0|1]', mark as 'script' in the 'files' table and set/remove the executable bit.
#
# Exit codes;
# 0 = Normal exit or md5sum of this program changed and it exited to reload.
# 1 = No databases available.
# 2 = Another process that is still running has picked up this job.
# 3 = No filename specified when needed by another switch.
# 4 = Request to change the file name but the new name wasn't given.
# 5 = The file specified was not found.
# 6 = The file to delete is not under '/mnt/shared/'.
# 
# 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->data->{switches}{'job-uuid'}  = "";
$anvil->data->{switches}{'rename'}    = "";
$anvil->data->{switches}{'is-script'} = "";
$anvil->data->{switches}{file}        = "";
$anvil->data->{switches}{to}          = "";
$anvil->data->{switches}{'delete'}    = "";
$anvil->data->{switches}{everywhere}  = "";
$anvil->Get->switches;
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
	"switches::job-uuid"   => $anvil->data->{switches}{'job-uuid'},
	"switches::rename"     => $anvil->data->{switches}{'rename'},
	"switches::is-script"  => $anvil->data->{switches}{'is-script'},
	"switches::file"       => $anvil->data->{switches}{file},
	"switches::to"         => $anvil->data->{switches}{to},
	"switches::delete"     => $anvil->data->{switches}{'delete'},
	"switches::everywhere" => $anvil->data->{switches}{everywhere},
}});

# Connect or die
$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__, 'print' => 1, level => 0, key => "error_0003"});
	$anvil->nice_exit({exit_code => 1});
}

# If we have a job_uuid, pick it up.
if ($anvil->data->{switches}{'job-uuid'})
{
	my $return = $anvil->Job->get_job_details({check => 1, job_uuid => $anvil->data->{switches}{'job-uuid'}});
	if ($return == 1)
	{
		# It's not a UUID.
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { 'return' => $return }});
		$anvil->nice_exit({code => 2});
	}
	if ($return == 2)
	{
		# This job is being handled by another process that is still alive.
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { 'return' => $return }});
		$anvil->nice_exit({code => 3});
	}
	
	# If there's a progress, clear it.
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { 'job::job_progress' => $anvil->data->{job}{job_progress} }});
	if ($anvil->data->{job}{job_progress})
	{
		$anvil->Job->update_progress({
			progress => 1, 
			message  => "clear", 
			job_uuid => $anvil->data->{jobs}{'job-uuid'},
		});
	}
}

# What are we doing?
if ($anvil->data->{switches}{'rename'})
{
	handle_rename($anvil);
}
elsif ($anvil->data->{switches}{'delete'}))
{
	handle_delete($anvil);
}

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


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

# This handles deleting a file. If the requested deletion target doesn't exist, we'll just clear the 
# database. If that doesn't exist either, we still don't error. This is to handle broad requests to delete a
# file everywhere. If we're asked to delete it everywhere, then we'll register a job against all hosts.
sub handle_delete
{
	my ($anvil) = @_;
	
	if (not $anvil->data->{switches}{file})
	{
		# Um...
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, key => "error_0052"});
		$anvil->nice_exit({exit_code => 3});
	}
	elsif ($anvil->data->{switches}{file} !~ /^\/mnt\/shared\//)
	{
		# We don't do that here...
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, key => "error_0053", variables => { file => $anvil->data->{switches}{file} }});
		$anvil->nice_exit({exit_code => 6});
	}
	
	# Does the file exist?
	if (-e $anvil->data->{switches}{file})
	{
		# Delete it.
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 1, key => "log_0263", variables => { file => $anvil->data->{switches}{file} }});
		
		unlink $anvil->data->{switches}{file};
		
		# Sleep and verify
		sleep 1;
		if (-e $anvil->data->{switches}{file})
		{
			# Failed to delete...
			# TODO:
		}
		else
		{
			# Deleted successfully. Remove from 'file_locations'
			### TODO: Find the file_uuid, then if found, see if we have and entry in file_location and then delete it.
		}
	}
	
	return(0);
}

# This handles renaming files.
sub handle_rename
{
	my ($anvil) = @_;
	
	# Do we have the current file name and the new one?
	if (not $anvil->data->{switches}{file})
	{
		# Um...
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, key => "error_0049"});
		$anvil->nice_exit({exit_code => 3});
	}
	elsif (not $anvil->data->{switches}{to})
	{
		# We need a target
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, key => "error_0050", variables => { file => $anvil->data->{switches}{file} }});
		$anvil->nice_exit({exit_code => 4});
	}
	elsif (not -f $anvil->data->{switches}{file})
	{
		# The file to rename doesn't exist.
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, key => "error_0051", variables => { file => $anvil->data->{switches}{file} }});
		$anvil->nice_exit({exit_code => 5});
	}
	elsif (-e $anvil->data->{switches}{to})
	{
		# There's already a file (or directory or something) with that name.
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, key => "error_0052", variables => { file => $anvil->data->{switches}{file}, to => $anvil->data->{switches}{to} }});
		$anvil->nice_exit({exit_code => 6});
	}
	
	### TODO: Left off here
	
	return(0);
}