#!/usr/bin/perl
# UCW Gallery: Generate published photos
# (c) 2004--2012 Martin Mares <mj@ucw.cz>

use strict;
use warnings;

use UCW::Gallery;
use Image::Magick;
use IO::Handle;
use File::Spec;
use File::Path;

STDOUT->autoflush(1);

my $gal = UCW::Gallery->load_config;

my $orig_list = $gal->read_list('gallery.list') or die "Cannot read gallery.list: $!\n";

my $photo_dir = $gal->get('PhotoDir');
if (-d $photo_dir) {
	print "Using existing output directory: $photo_dir\n";
} else {
	print "Creating output directory: $photo_dir\n";
	File::Path::mkpath($photo_dir) or die "Unable to create $photo_dir: $!\n";
}

my $photo_meta = $photo_dir . "/gallery.meta";
my $old_meta = {};
if (-f $photo_meta) {
	print "Reading old meta-data\n";
	$old_meta = $gal->read_meta($photo_meta);
	# use Data::Dumper; print "Read old meta: ", Dumper($old_meta), "\n";
}
my $meta = { 'photo' => {} };

for my $f (@$orig_list) {
	my $id = $f->{id};
	my $rotate = $f->{orientation};
	my $xfrm = $f->{xfrm};
	print "$id: ";

	my $p = new Image::Magick;
	my $orig = File::Spec->rel2abs($f->{file}, $gal->get('OrigDir'));
	my ($orig_w, $orig_h, $orig_size, $orig_format) = $p->PingImage($orig) or die "Error reading $orig\n";
	print "${orig_w}x${orig_h} ";

	my ($w0, $h0) = ($rotate eq "l" || $rotate eq "r") ? ($orig_h, $orig_w) : ($orig_w, $orig_h);
	my ($w, $h) = ($w0, $h0);
	if ($w > $gal->get('PhotoMaxWidth')) {
		my $s = $gal->get('PhotoMaxWidth') / $w;
		$w = $w * $s;
		$h = $h * $s;
	}
	if ($h > $gal->get('PhotoMaxHeight')) {
		my $s = $gal->get('PhotoMaxHeight') / $h;
		$w = $w * $s;
		$h = $h * $s;
	}
	$w = int($w);
	$h = int($h);
	
	my $m = {
		'o' => $rotate,
		'xf' => $xfrm,
		'w' => $w,
		'h' => $h,
	};
	$meta->{photo}->{$id} = $m;

	my $om = $old_meta->{photo}->{$id};
	if ($om &&
	    $om->{o} eq $m->{o} &&
	    $om->{xf} eq $m->{xf} &&
	    $om->{w} eq $m->{w} &&
	    $om->{h} eq $m->{h}) {
		# FIXME: Remove old images?
		print "... uptodate\n";
		next;
	}

	my $e;
	$e = $p->Read($orig) and die "Error reading $orig: $e";
	$p->Strip;
	$p->SetAttribute(quality=>90);

	if ($xfrm =~ /s/) {
		print "-> sharpen ";
		$p->Sharpen(1);
	}
	if ($xfrm =~ /h/) {
		print "-> equalize ";
		$p->Equalize();
	}
	if ($xfrm =~ /n/) {
		print "-> normalize ";
		$p->Normalize();
	}

	my $rot = 0;
	if ($rotate eq "l") { $rot = 270; }
	elsif ($rotate eq "r") { $rot = 90; }
	elsif ($rotate eq "u") { $rot = 180; }
	if ($rot) {
		print "-> rotate $rot ";
		$p->Rotate(degrees=>$rot);
	}

	if ($w != $w0 || $h != $h0) {
		print "-> ${w}x${h} ";
		$p->Resize(width=>$w, height=>$h);
	}

	my $photo = File::Spec->catfile($photo_dir, $id . ".jpg");
	my $tmp = "$photo.new";
	$e = $p->Write($tmp) and die "Unable to write $tmp: $e";
	rename $tmp, $photo or die "Cannot rename $tmp to $photo: $!\n";

	print "... OK\n";
}

print "Cleaning up stale files\n";
for my $f (<$photo_dir/*.jpg>) {
	my ($vv, $dd, $id) = File::Spec->splitpath($f);
	$id =~ s{\..*$}{};
	unless (defined $meta->{photo}->{$id}) {
		print "$id: removing\n";
		unlink $f;
	}
}

print "Writing meta-data\n";
$gal->write_meta($photo_meta, $meta);