#!/usr/bin/perl -w

use strict;
use warnings;
use JSON;
use Image::Magick;

my $images_path = "";
my $libraries_path = "";
my $json = JSON->new;


sub get_info {
#	foreach (%ENV) { print $_."<br />"; }
	my $clientIP = ($ENV{"REMOTE_ADDR"} or "0.0.0.0");
	my $proto = ($ENV{"REQUEST_SCHEME"} or "http");
	my $query = (split(/\?/,($ENV{"QUERY_STRING"} or "")))[0];
	my $referrer = ($ENV{"HTTP_REFERER"} or "");
	return ($proto,$clientIP,$query,$referrer);
}

sub http_status {
	my ($status,$content,$target) = @_;
	my $header = "";
	$header .= "status: ".$status."\r\n";
	$header .= "Location: ".$target."\r\n" if $target;
	$header .= "Content-Type: ".$content."\r\n" if $content;
	$header .= "\r\n";
	return $header;
}

sub html_element {
	return "<".($_[0] or "div").($_[2] or "").">".($_[1] or "")."</".($_[0] or "div").">\n";
}

sub style_links {
	return html_link("icon","image/gif","img/".$_[0].".png").html_link("stylesheet","text/css","css/css_".$_[0]);
}

sub page_content {
	return html_element("html", html_element("head", html_element("title",shift).shift ).html_element("body",shift) );
}

sub soft_die {
	print http_status(500,"text/html; charset=utf-8");
	print page_content("500",style_links("no"),shift);
	exit;
}

sub normalize_string {
	return join(" ",(map { ucfirst($_) } split("_",shift)));
}

sub list_galleries {
	opendir(GALLERY,$images_path);
	my @galleries = readdir(GALLERY);
	close GALLERY;
	my @filtered_galleries = ();
	foreach (@galleries) {
		next if ($_ =~ m/^\./);
		next unless (-d $images_path.$_ );
		push(@filtered_galleries,$_);
	}
	return $json->encode(\@filtered_galleries);
}

sub list_images {
	my $path = $images_path."/".$_[0];
	opendir(GALLERY,$path);
	my @images = readdir(GALLERY);
	close GALLERY;
	my @filtered_images = ();
	foreach (@images) {
		next if ($_ =~ m/^\./);
		next if (-d $path."/".$_ );
		push(@filtered_images, $_);
	}
	return $json->encode(\@filtered_images);
}

sub make_imagepath {
	my ($name, $gallery, $version) = @_;
	return $gallery."/".$version."/".$name;
}

sub thumb_gen {
        my ($image,$thumb)=@_;
        my $file = Image::Magick->new;
        $file->Read("$image");
        $file->Resize('200x200');
        print $file->Write("$thumb");
}

sub get_image {
	print http_status(200,"image/png;");
	my ($name,$gallery,$version) = @_;
        unless ($name) { $name = "test.jpg"; }
        unless ($gallery) { $gallery = "/"; }
        unless ($version) { $version = "/"; }
	my $full_path = $images_path.make_imagepath($name,$gallery,"");
	my $thumb_path = $images_path.make_imagepath($name,$gallery,$version);
	if ( "thumb" eq $version ) {
        	unless (-e $thumb_path ) {
                	thumb_gen($full_path,$thumb_path); #If the thumb doesn't exsist we make it.
        	}	
		open(FILE,"<",$thumb_path) or return print "0";
	} else {
		if ( "" eq $version ) { 
			open(FILE,"<",$full_path) or return print "0";
		} else {
			open(FILE,"<",$thumb_path) or return print "0";
		}
	}
	while(<FILE>) { print; }
	close FILE;
}

sub giveBook {
	my ($library, $book) = @_;
	open(THEBOOK, $libraries_path.$library."/".$book) or return print "0";
	while(<THEBOOK>) { print; }
	close THEBOOK;
}

sub clean_input {
	my $input = shift;
	if ($input =~ m!%2F!) { print "Location: /hax\r\n\r\n"; exit; }
	$input =~ s!%(..)!chr hex $1!ge;
	$input =~ s!\+! !g; 
	return $input;
}

# And now for our verbs
my @request = get_info();
my @get_params = split("!",clean_input($request[2]));
my $directive = shift(@get_params);
if ( "i" eq $directive ) {
	get_image(@get_params);
} elsif ( "lg" eq $directive ) {
	print http_status(200,"text/json");
	print '{"galeries":'.list_galleries().'}';
} elsif ( "gg" eq $directive ) { 
	print http_status(200,"text/json");
	print '{"images":'.list_images($get_params[0]).'}';
} elsif ( "l" eq $directive ) {
	print http_status(200,"text/plain");
	giveBook(@get_params);
} else {
	print http_status(200,"text/json");
	print '{"error":"No input or incorrect input"}';
}