$WGET = "wget";
$SCRIPT_NAME = $ENV{'SCRIPT_NAME'} || $0;
$CGI = "file://$SCRIPT_NAME";
$_ = $QUERY_STRING = $ENV{"QUERY_STRING"};
$UserAgent = "Monazilla/1.00 (w3m/2ch.cgi)";

if (/subback.html$/) {
    &subback();
    exit;
}

s@/(\d+)(/([^/]*))?$@/$1@ || exit;
my $datnum = $1;
$label = $3;
$cgi = "$CGI?$_";

s@^http://([^/]+)/test/read.cgi/([^/]+)/@$1/$2/dat/@ || exit;
$subback = "$CGI?http://$1/$2/subback.html";
$bbs = $2;
if ($ENV{REQUEST_METHOD} eq "POST") {
    &post();
    exit;
}

$_ .= ".dat";
$dat = "http://$_";
$tmp = $ENV{"HOME"} . "/.w3m2ch/$_";
$dat =~ s/([^\w\/.\:\-])/\\$1/g;
$tmp =~ s/([^\w\/.\:\-])/\\$1/g;
($dir = $tmp) =~ s@/[^/]+$@@;
$cmd = "mkdir -p $dir; $WGET -c -U \"$UserAgent\" -O $tmp $dat >/dev/null 2>&1";
system $cmd;
$lines = (split(" ", `wc $tmp`))[0];
$lines || exit;

@ARGV = ($tmp);
if ($label =~ /^l(\d+)/) {
    $start = $lines - $1 + 1;
    if ($start < 1) {
        $start = 1;
    }
    $end = $lines;
} elsif ($label =~ /^(\d+)-(\d+)/) {
    $start = $1;
    $end = $2;
} elsif ($label =~ /^(\d+)-/) {
    $start = $1;
    $end = $start + 100 - 1;
} elsif ($label =~ /^(\d+)/) {
    $start = $1;
    $end = $1;
} else {
    $start = 1;
    $end = $lines;
}
$head = "<a href=\"$subback\">���f���‚ɖ߂遡</a>\n";
$head .= "<a href=\"$cgi/\">�S��</a>\n";
for (0 .. ($lines - 1) / 100) {
    $n = $_ * 100 + 1;
    $head .= "<a href=\"$cgi/$n-\">$n-</a>\n";
}
$head .= "<a href=\"$cgi/l50\">�ŐV50</a>\n";
print <<EOF;
Content-Type: text/html; charset=Shift_JIS

EOF
$i = 1;
while (<>) {
    s/\r?\n$//;
    ($name, $mail, $date, $_, $title) = split(/\<\>/);
    if ($i == 1) {
        if (!$title) {
            print <<EOF;
���̃X���b�h�͉ߋ����O�q�ɂɊi�[����Ă��܂��B
<p>
<a href="$QUERY_STRING">$QUERY_STRING</a>
EOF
            unlink($tmp);
            exit
        }
        print <<EOF;
<title>$title</title>
$head
<p>$title</p>
<dl>
EOF
    }
    if ($mail) {
        $name = "<a href=\"mailto:$mail\">$name</a>";
    }
    s@http://ime.nu/@http://@g;
    s@(h?ttp:)([#-~]+)@"<a href=\"" . &link("http:$2") .  "\">$1$2</a>"@ge;
    s@(ftp:[#-~]+)@<a href="$1">$1</a>@g;
    s@<a href="../test/read.cgi/\w+/\d+/@<a href="$cgi/@g;
    if ($i == 1 || ($i >= $start && $i <= $end)) {
        print <<EOF;
<dt><a name="$i">$i</a> �F$name�F$date
<dd>
$_
<p>
EOF
    }
    $i++;
}
print <<EOF;
</dl>
<hr>
<form method=POST action="$cgi"><input type=submit value="��������" name=submit> ���O�F <input name=FROM size=19> E-mail<font size=1> (�ȗ���) </font>: <input name=mail size=19><br><textarea rows=5 cols=70 wrap=off name=MESSAGE></textarea><input type=hidden name=bbs value=$bbs><input type=hidden name=key value=$datnum><input type=hidden name=time value=@{[time]}></form></body></html>
EOF

sub link {
    local($_) = @_;
    if (m@/test/read.cgi/@) {
        return "$CGI?$_";
    }
    return $_;
}

sub subback {
    $dat = $_;
    s@http://@@ || exit;
    $tmp = $ENV{"HOME"} . "/.w3m2ch/$_";
    $dat =~ s/([^\w\/.\:\-])/\\$1/g;
    $tmp =~ s/([^\w\/.\:\-])/\\$1/g;
    ($dir = $tmp) =~ s@/[^/]+$@@;
    $cmd = "mkdir -p $dir; $WGET -O $tmp $dat >/dev/null 2>&1";
    system $cmd;
print <<EOF;
Content-Type: text/html; charset=Shift_JIS

EOF
    @ARGV = ($tmp);
    while (<>) {
        if (/<base href="([^"]+)"/) {
            $base = $1;
        } elsif ($base) {
            s@^<a href="@<a href="$CGI?$base@;
        }
        print;
    }
    unlink($tmp);
}

sub post {
    my $debug = 0;

    $| = 1;
    use IO::Socket;
    my @POST = <>;
    $QUERY_STRING =~ m@^http://([^/]+)@;
    my $host = $1;
    my $sock = IO::Socket::INET->new("$host:80") or die;
    # retrieve posting cookie; this may not work
    print "Content-Type: text/html; charset=Shift_JIS\n\n";
    print $sock
        "HEAD /test/bbs.cgi HTTP/1.1\n",
        "Host: $host\n",
        "Connection: keep-alive\n",
        "\n";
    my $posting_cookie = undef;
    while (<$sock>) {
        print if ($debug);
        s/[\n\r]+$//;
        last if (/^$/);
        if (/^set-cookie:.*(PON=[^;]+)/i) {
            $posting_cookie = $1;
        }
    }
    #$sock = IO::Socket::INET->new("$host:80") or die;
    my $submit =
        "POST /test/bbs.cgi HTTP/1.1\n" .
        "Host: $host\n" .
        "Accept-Language: ja\n" .
        "User-Agent: $UserAgent\n" .
        "Referer: $QUERY_STRING\n" .
        "Cookie: $posting_cookie; NAME=nobody; MAIL=sage\n" .
        "Content-Length: " . length(join("", @POST)) . "\n" .
        "\n@POST";
    print $sock $submit or die;
    print "\n-- POSTed contents --\n${submit}\n-- POSTed contents --\n"
        if ($debug);
    my $chunked = 0;
    while (<$sock>) {
        s/[\n\r]*$//;
        last if (/^$/);
        $chunked = 1 if (/^transfer-encoding:\s*chunked/i);
    }
    my $post_response = "";
    while (<$sock>) {
        if ($chunked) {
            s/[ \r\n]*$//;
            my $len = hex($_);
            $len > 0 or last;
            read($sock, $_, $len);
            <$sock>;    #skip empty line at the end of chunk.
        }
        $post_response .= $_;
    }
    $post_response =~ s/<META content=(\d+);URL=(\S+) http-equiv=refresh>/<META content=$1;URL=$cgi http-equiv=refresh>/im;
    print $post_response;
    exit;
}