#! /usr/bin/perl -w
# Woman's Voice
# last_update.cgi: The last-update date of the whole web site.

#  Copyright (c) 2003-2021 imacat.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

# Author: imacat <imacat@mail.imacat.idv.tw>
# First written: 2003-04-09

use 5.008;
use strict;
use warnings;
use lib $ENV{"DOCUMENT_ROOT"} . qw(/magicat/lib/perl5);
use Selima::wov;
local $SIG{"__DIE__"} = \&http_500;
my $d = new Selima::Destroy;
# Prototype declaration
sub main();
sub find_files_in(\@\@);
sub fmttime_local($);
sub html_image($);

use File::Spec;
use GD;
use IO::NestedCapture qw(CAPTURE_STDOUT);

use vars qw(@DIREXCS %RDIREXCS @FGCOLOR @BGCOLOR $FONT);
# Directories to be excluded (no leading and trailing slashes)
@DIREXCS = qw(magicat);
@FGCOLOR = (0, 0, 0);           # #000000 Black
@BGCOLOR = (255, 255, 255);     # #FFFFFF White
$FONT = gdLargeFont;
use constant TRANSPARENT => 1;
initenv(    -allowed    => [qw(GET HEAD)],
            -session    => 0,
            -dbi        => DBI_NONE,
            -lastmod    => 0,
            -multilang  => 0);
%RDIREXCS = map { File::Spec->catfile($DOC_ROOT, $_) => 1 } @DIREXCS;

main;
exit 0;

sub main() {
    local ($_, %_);
    my (@tables, @files);
    
    @tables = qw();
    @files = qw();
    @_ = ($DOC_ROOT);
    find_files_in(@files, @_);
    http_304 if not_modified @tables, @files;
    
    html_image($LAST_MODIFIED);
    
    return;
}

# find_files_in: an easy file finder
sub find_files_in(\@\@) {
    local ($_, %_);
    my ($files, $dirs, @subdirs, $DH, $ent);
    ($files, $dirs) = @_;
    
    # Bounce for nothing
    return if scalar(@$dirs) == 0;
    # Look in these directories
    @subdirs = qw();
    foreach my $dir (@$dirs) {
        $dir =~ s/\/$//;
        opendir $DH, $dir   or die "$dir: $!";
        while (defined($_ = readdir $DH)) {
            next if /^\./;
            # Using catfile() is better, but a lot slower
            $ent = File::Spec->catfile($dir, $_);
            #$ent = "$dir/$_";
            if (-f $ent) {
                push @$files, $ent;
            } elsif (-d $ent) {
                push @subdirs, $ent
                    if !exists $RDIREXCS{$ent};
            }
        }
        closedir $DH        or die "$dir: $!";
    }
    # Look in the subdirectories
    find_files_in @$files, @subdirs;
    return;
}

# fmttime_local: Format the time using my own format
sub fmttime_local($) {
    @_ = localtime $_[0];
    return sprintf "%04d.%02d.%02d", $_[5]+1900, $_[4]+1, $_[3];
}

# html_image: Make the image from the last-update value 
sub html_image($) {
    local $_;
    my ($last_update, $image, $width, $height, $fgcolor, $bgcolor);
    $last_update = $_[0];
    
    # Format the date to my preferred format
    $last_update = fmttime_local($last_update);
    
    # Initialize the image object
    # Get the width and height
    $width = $FONT->width * (length $last_update);
    $height = $FONT->height;
    # Create an image object
    $image = GD::Image->new($width, $height);
    # Create the forground/background color objects
    $fgcolor = $image->colorAllocate(@FGCOLOR);
    $bgcolor = $image->colorAllocate(@BGCOLOR);
    
    # Draw the image
    # Set the transparent background
    $image->transparent($bgcolor) if TRANSPARENT;
    # Paint the background
    $image->filledRectangle(0, 0, $width, $height, $bgcolor);
    # Write the text
    $image->string($FONT, 0, 0, $last_update, $fgcolor);
    
    # Output
    $CONTENT_TYPE = "image/png";
    binmode IO::NestedCapture->instance->{"STDOUT_current"}[-1], ":raw";
    print $image->png;
    
    return;
}