#!/usr/bin/env perl

# Hacked by Thomas Orgis, use at your leisure.

use strict;
use locale;

use File::Basename qw(basename dirname);

my @mpg123_command = qw(mpg123 --continue -Cv --rva-album);
my $listfile = "conplay.m3u";
my $glob = '*.mp[123]';

my $dir = shift;

unless(defined $dir)
{
	print STDERR "\nThis little wrapper runs $mpg123_command[0] on a given directory (hand in '.' for the current one), playing all $glob files therein in terminal control mode. The extra trick is that a playlist file ($listfile by default) is read and updated (created) with the position you left playback at (via 'q' key), to return on next invokation.\n";
	print STDERR "\nIf you give an existing file instead of a directory, or some non-existing path, as first and only paramter, it is used as playlist name and the directory part is used as the base directory for playback.\n";
	print STDERR "\nThe name stands for CONtinued PLAYback. What did you think?;-)\n\n";
	exit;
}

if(-f $dir or (not -e $dir))
{
	$listfile = basename($dir);
	$dir = dirname($dir);
}


chdir($dir) or die "Cannot enter $dir ($!)!\n";

print STDERR "Playing things in: $dir\n";

my @files;
my $entry = 1;
my $frame = 0;

if(-e $listfile)
{
	open(LIST, '<', $listfile) or die "Cannot read playlist ($!)!\n";
	while(<LIST>)
	{
		chomp;
		unless(/^#/)
		{
			push(@files, $_);
		}
		elsif(/^#\s*current entry:\s*(\d+)$/)
		{
			$entry = $1;
		}
		elsif(/^#\s*current frame:\s*(\d+)$/)
		{
			$frame = $1;
		}
	}
	close(LIST);
}
else
{
	@files = get_files($glob);
	write_list();
}

unless(@files)
{
	print STDERR "There are no files to play.\n";
	exit;
}

if($entry < 0 or $entry > @files or $frame < 0)
{
	die "You got bad data in your playlist file (mismatch between current entry and total count, bad frame index). Clean that up.\n";
}

push(@mpg123_command, '-k', $frame, '--listentry', $entry, '-@', $listfile);
print STDERR "running player:\n\t@mpg123_command\n\n";

open(MPG123, '-|', @mpg123_command) or die "Cannot run mpg123!";
while(<MPG123>)
{
	print STDOUT $_;
	if(/^\[CONTINUE\]\s+track\s+(\d+)\s+frame\s+(\d+)/)
	{
		$entry = $1;
		$frame = $2;
	}
	if(/^\[BOOKMARK\]\s+track\s+(\d+)\s+frame\s+(\d+)/)
	{
		print STDERR "\nGot bookmark at track $1, frame $2; not yet doing anything with that, besides storing.\n";
		$entry = $1;
		$frame = $2;
	}
}
close(MPG123);

if($entry > @files)
{
	$entry = 0;
	$frame = 0;
}
print STDERR "Continue point is in track $entry, frame $frame.\n";
write_list();

sub write_list
{
	unless(@files)
	{
		print STDERR "Refusing to write empty playlist.\n";
		return;
	}
	open(LIST, '>', $listfile) or die "Cannot write Playlist";
	print LIST "#M3U\n";
	print LIST "#current entry: $entry\n";
	print LIST "#current frame: $frame\n";
	for my $f (@files)
	{
		print LIST "$f\n";
	}
	close(LIST);
}

sub get_files
{
	my $glob = shift;
	my @files;
	open(FIND, '-|', 'find', '.', '-type', 'f', '-name', $glob) or die "Cannot exec find to find files: ($!)\n";
	@files = <FIND>;
	close(FIND);
	chomp(@files);
	return sort @files;
}