#!/usr/bin/perl
use strict;
use warnings;

use Tk;
use Tk::FileSelect;
use MP3::ID3v1Tag;

my $file;
my $select;
my %info;
my @info  = qw/title artist album year genre genre_num comment/;
my %mp3;


#Frames deklarieren
my %config;
$config{main} = MainWindow->new();
$config{up}   = $config{main}->Frame()->pack(-side => 'top');
$config{bottom} = $config{main}->Frame()->pack(-side => 'bottom');
$config{bottom_left} = $config{bottom}->Frame()->pack(-side => 'left');
$config{bottom_right} = $config{bottom}->Frame()->pack(-side => 'right');
$config{middle} = $config{main}->Frame()->pack(-side => 'bottom');
$config{middle_left} = $config{middle}->Frame()->pack(-side => 'left');
$config{middle_right} = $config{middle}->Frame()->pack(-side => 'right');
$config{top} = $config{main}->Frame()->pack(-side => 'top');
$config{top_left} = $config{top}->Frame()->pack(-side => 'left');
$config{top_right} = $config{top}->Frame()->pack(-side => 'right');

#Titel erzeugen
$config{main}->configure(-title => "MP3 Tag Editor");


#Überschrift erzeugen
$config{header} = $config{up}->Label(-text => 'MP3 Tag Editor', -font => '{Arial} 15 {underline}')->pack();

#Buttons erzeugen
$config{button_save} = $config{bottom_left}->Button(-text => 'Save', -command => \&save)->pack(-side => 'left');

$config{button_exit} = $config{bottom_right}->Button(-text => 'Quit', -command => sub { $config{main}->destroy(); })->pack(-side => 'right');

$config{button_clear} = $config{bottom_right}->Button(-text => 'Clear', -command => \&clear)->pack();

#MP3 Selektion
$config{top_left}->Entry(-textvariable => \$file)->pack(-side => 'top');
$config{top_right}->Button(-text => 'MP3', -command => \&mp3_select)->pack(-side => 'top');

#Hauptinhalt erzeugen
foreach (@info) {
$config{middle_left}->Label(-text => "$_")->pack();
$mp3{$_} = $config{middle_right}->Entry(-textvariable => \$info{$_})->pack();
}

MainLoop();


sub mp3_select {
        $select = $config{main}->FileSelect(-directory => './');
        $file= "";
        $file = $select->Show;
    unless($file =~ /.*\.mp3/i) {
        $file = "";
        $config{error} = $config{main}->Toplevel();
        $config{error}->Label(-text => 'Kann nur MP3 Dateien öffnen !')->pack();
        $config{error}->Button(-text => 'Schließen', -command => sub { $config{error}->destroy(); })->pack(-side => 'bottom');
    } else {
        &mp3_info();
    }
}

sub mp3_info {
    my $mp3_file = new MP3::ID3v1Tag($file);
    foreach my $info (@info) {
        my $tmp = "get_$info";
        $info{$info} = $mp3_file->$tmp();
    }
}

sub clear {
    foreach (@info) {
        $mp3{$_}->delete('0.0','end');
    }
}

sub save {
    my $mp3_file = new MP3::ID3v1Tag($file);
    foreach (@info) {
        my $tmp = "set_$_";
        my $new = $mp3{$_}->get();
        $mp3_file->$tmp($new);
        my $save_status = $mp3_file->save();
        unless($save_status) {
            $config{popup} = $config{main}->Toplevel();
            $config{popup}->Label(-text => "Fehler beim sichern von $_")->pack();
            $config{popup}->Button(-text => 'Schließen', -command => sub { $config{popup}->destroy(); })->pack(-side => 'bottom');
        }
    }
}