#!/usr/bin/perl

use strict;
$| = 1;

my $USAGE = <<__EOU;
Usage: dvdrip-thumb in-file out-file top right bottom left
       dvdrip-thumb in-file out-file width height
__EOU

main: {
    if ( @ARGV == 6 ) {
        cut(@ARGV);
    }
    elsif ( @ARGV == 4 ) {
        resize(@ARGV)
    }
    else {
        usage();
    }
}

sub usage {
    print $USAGE;
    exit 1;
}

sub cut {
    my ($in_file, $out_file, $top, $right, $bottom, $left) = @_;
    
    print "$in_file: cut $top $right $bottom $left\n";
    
    if ( !$top && !$right && !$bottom && !$left ) {
        require File::Copy;
        File::Copy::copy($in_file, $out_file);
        return;
    }
    
    my $identify = qx[ identify $in_file 2>&1 ];
    my ($width, $height);

    ($width, $height) = ( $identify =~ /\s+(\d+)x(\d+)([+-]\d+[+-]\d+)?\s+/ );

    die "Identify error: $identify" unless defined $width &&
                                           defined $height;

    my $new_width  = $width - $left - $right;
    my $new_height = $height - $top - $bottom;

    my $command =
        "convert $in_file -crop ".
        "${new_width}x${new_height}+$left+$top ".
        $out_file.
        " && CONVERT_OK";

    my $convert = qx[ ( $command ) 2>&1 ];
    
    die "Convert error: $convert" unless $convert =~ /CONVERT_OK/;
}

sub resize {
    my ($in_file, $out_file, $new_width, $new_height) = @_;

    print "$in_file: resize $new_width $new_height\n";

    my $command =
        "convert $in_file -geometry ".
        "'${new_width}!x${new_height}!' ".
        $out_file.
        " && CONVERT_OK";

    my $convert = qx[ ( $command ) 2>&1 ];
    
    die "Convert error: $convert" unless $convert =~ /CONVERT_OK/;
}