#!/usr/bin/perl

use File::Copy;
use File::Basename;
use Getopt::Std;
use File::stat;
use Time::localtime;

# Configuration parameters
my $srcpathname = "/naspool/pictures/New Photos"; # Path to look for photos to move from
my $dstpathname = "/naspool/videos/HomeVideos"; # Path to move the photos to
my $merge_videos_by_day = "/naspool/videos/bin/merge_videos_by_day";
my $minage = "+10"; # Files must be older than X minutes to move
my $owner = "ajp"; # The owner of the files after they are moved
my $group = "pip"; # The group of the files after they are moved
my $mode = "664"; # The mode to set on each file after they are moved
my $find_cmd = "find \"$srcpathname/\" -cmin $minage -a \\( -iregex \".*\.mov\" -o -iregex \".*\.3gp\" -o -iregex \".*\.mp4\" -o -iregex \".*\.mts\" -o -iregex \".*\.mkv\" \\)";

# Sanity check
if(! -d $srcpathname) { print "-E- Can't find srcpath: $srcpathname\n"; exit 1; }
if(! -d $dstpathname) { print "-E- Can't find dstpath: $dstpathname\n"; exit 1; }
if(! -x $merge_videos_by_day) { print "-E- Can't find required script: $merge_videos_by_day\n"; exit 1; }

my %monthname2month = (
		       "Jan" => "01",
		       "Feb" => "02",
		       "Mar" => "03",
		       "Apr" => "04",
		       "May" => "05",
		       "Jun" => "06",
		       "Jul" => "07",
		       "Aug" => "08",
		       "Sep" => "09",
		       "Oct" => "10",
		       "Nov" => "11",
		       "Dec" => "12"
		       );

my %month2monthname = (
		       "01" => "Jan",
		       "02" => "Feb",
		       "03" => "Mar",
		       "04" => "Apr",
		       "05" => "May",
		       "06" => "Jun",
		       "07" => "Jul",
		       "08" => "Aug",
		       "09" => "Sep",
		       "10" => "Oct",
		       "11" => "Nov",
		       "12" => "Dec"
		       );

getopts("htv");

sub usage {
    print "usage: $0 [-v] [-t]\n";
    print "   -v = verbose; print file being moved (to)\n";
    print "   -t = test; print what will happen, but don't do anything\n";
    return 1;
}

sub is_folder_empty {
    my $dirname = shift;
    opendir(my $dh, $dirname) or die "Not a directory";
    return scalar(grep { $_ ne "." && $_ ne ".." } readdir($dh)) == 0;
}

if(defined $opt_h) { usage(); exit 1; }

# Only proceed if there are video files to organize
$video_files_found=`$find_cmd`;
if(!$video_files_found) { exit 0; }

# Only one instance of this script running at a time
use File::Pid;
my $pidfile = File::Pid->new({file => "/tmp/organize_videos.pid"});
exit if $pidfile->running();
$pidfile->write();

# Print the date
system("date");

# Merge videos prior to copying them over to the destination path
my $errno = 0;
if(defined $opt_t) { 
    $errno=system("$merge_videos_by_day -s \"$srcpathname\" -t");
} else {
    $errno=system("$merge_videos_by_day -s \"$srcpathname\"");
}
if($errno > 0) { $errno = $errno - 255; }
if($errno) { die "-E- $merge_videos_by_day encountered some errors with exit code $errno\n"; }

# Copy the videos over to the destination path
chdir "$srcpathname";
print "$find_cmd\n" if($opt_v);
foreach $file (`$find_cmd`) {

    chomp($file);
    $srcdir = dirname($file);
    $file = basename($file);
    $srcfile = $file;
    $ext = $file; $ext =~ s/.*\.(\S+)$/$1/; $ext = lc($ext);
    
    print "Found movie: srcdir: $srcdir srcfile: $srcfile ext: $ext\n" if($opt_v);

    # Throw out files not in the current srcpath
    if((! -f "$srcfile") && (! -f "$srcdir/$srcfile")) { next; }
    
    # Change all spaces to underscores in the filename
    #$srcfile =~ s/ /_/g;
        
    # Make a note of the month, year, and day this video was taken (from the modification time of the file)
    $date_taken = ctime(stat("$srcdir/$srcfile")->mtime);

    # Get the date taken from the filename
    if($srcfile =~ /^(\d+)-(\d+)-(\d+)/) {
	$year = $1;
	$month = $2;
	$day = sprintf("%02d",$3);
	$monthnum = $month;
	$monthname = lc($month2monthname{$month});
    }
    # Get the date taken from the modification time
    elsif($date_taken =~ /\S+\s+(\S+)\s+(\d+)\s+\S+\s+(\d+)/) {
	$year = $3;
	$month = $1;
	$day = sprintf("%02d",$2);
	$monthnum = $monthname2month{$month};
	$monthname = lc($month2monthname{$month});
    } else {
	print "-E- Unable to parse year and month from this file: $srcdir/$srcfile\n";
	next;
    }

    # We are ready to pick a destination folder to put the picture in
    $dstdir = $dstpathname . "/" . $year;
    $dstfile = $dstdir . "/" . $year . "-" . $monthnum . "-" . $day;

    # Check for duplicate filenames at the destination
    $newfile = $dstfile . "." . "000";
    if(-e "$newfile.$ext") {
	foreach $i ('001' .. '999') {
	    $newfile = $dstfile . "." . $i;
	    if(! -e "$newfile.$ext") { last; }
	}
	$dstfile = $newfile;
    }
    $dstfile = "$newfile.$ext";

    if(defined $opt_t) {
	print "-> Moving \"$srcdir/$srcfile\" to \"$dstfile\"\n";
    } else {
	# Make sure the destination directories exist
	$errno=system("mkdir -p \"$dstdir\"");
	if($errno) { print "-E- Error creating dstdir: $dstdir\n"; next; }
	# Perform the move operation from $srcdir/$srcfile -> $dstfile
	if($opt_v) { print "-> Moving \"$srcdir/$srcfile\" to \"$dstfile\"\n"; }
	# Make sure the dstfile doesn't exist, if it does, don't do the move
	if(! -f "$dstfile") {
	    $errno=system("mv \"$srcdir/$srcfile\" \"$dstfile\" 2>/dev/null");
	    if($errno) { print "-E- Error moving srcfile to dstfile: $srcdir/$srcfile -> $dstfile\n"; next; }
	} else {
	    if($opt_v) { print "-> Skipping \"$srcdir/$srcfile\". Destfile \"$dstfile\" already exists.\n"; }
	}
	# Fix the permissions
	system("chown $owner \"$dstfile\"");
	system("chgrp $group \"$dstfile\"");
	system("chmod $mode \"$dstfile\"");
    }

    # Check to see if there is an empty sub directory to remove
    if(($srcdir ne $srcpathname) && ($srcpathname ne ".")) { 
      if(is_folder_empty($srcdir)) { 
	  print "-> Subdir detected for videos ($srcdir != $srcpathname)\n" if($opt_v);
	  if(! defined $opt_t) { 
	      $tmpdir=`tempfile`;
	      system("rm $tmpdir");
	      system("mv \"$srcdir\" $tmpdir > /dev/null 2>/dev/null");
	      print "-> Moved empty subdir $srcdir to $tmpdir\n" if($opt_v);
	  }
      }
    }
}

$pidfile->remove();

print "\n\n";