#!/usr/bin/perl -wTI.
#
# TWiki WikiClone (see wiki.pm for $wikiversion and other info)
#
# Copyright (C) 1999-2000 Peter Thoeny, peter@thoeny.com
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details, published at 
# http://www.gnu.org/copyleft/gpl.html

use wiki;

my $debug = ! ( @ARGV && $ARGV[0] eq "-q" );

&main();

sub main
{
    $debug && print "TWiki mail notification\n";
    $debug && print "- to suppress all normal output: mailnotify -q\n";

    my $dataDir = &wiki::getDataDir();
    opendir( DIR, "$dataDir" ) or die "could not open $dataDir";
    @weblist = grep !/^\.\.?$/, readdir DIR;
    closedir DIR;
    foreach $web ( @weblist ) {
        if( -d "$dataDir/$web" ) {
             processWeb( $web );

             # remove obsolete .lock files
             &wiki::removeObsoleteTopicLocks( $web );
        }
    }
    $debug && print "End Twiki mail notification\n";
}

sub processWeb
{
    my( $web) = @_;

    my ( $topic, $webName, $dummy, $userName, $dataDir) = 
	&wiki::initialize( "/$web", "nobody" );
    $dummy = "";  # to suppress warning

    $debug && print "Checking TWiki.$webName\n";

    if( ! &wiki::webExists( $webName ) ) {
	print STDERR "* Error: TWiki mailnotify does not find web $webName\n";
	return;
    }

    my $notifylist = &wiki::getEmailNotifyList($webName);
    if( ! $notifylist ) {
	$debug && print "- Note: Notification list is empty\n";
	return;
    }

    my $emailbody = "";
    my $topiclist = "";

    my $text = &wiki::readTemplate( "changes" );
    my $changes= &wiki::readFile( "$dataDir/$webName/.changes" );

    my %exclude;

    $text = &wiki::handleCommonTags($text, $topic);
    $text =~ s/<img src=.*?[^>]>/[IMG]/goi;  # remove all images

    ( $before, $text, $after) = split( /%REPEAT%/, $text);
    $emailbody = "$before";

    my $prevLastmodify = &wiki::readFile( "$dataDir/$webName/.mailnotify" );
    my $currLastmodify = "";
    my $scriptSuffix = $wiki::scriptSuffix;
    my $scriptUrlPath = $wiki::scriptUrlPath;
    my $scriptUrl = "$wiki::urlHost$scriptUrlPath";

    foreach( reverse split( /\n/, $changes ) ) {
	@bar = split( /\t/);
	$foo = $text;
	if( ( !defined( %exclude) ) || ( !$exclude{ $bar[0] } ) ) {
	    if( !$currLastmodify ) {
	        # newest entry
	        $time = &wiki::formatGmTime( $prevLastmodify );
	        if( $prevLastmodify eq $bar[2] ) {
	            # newest entry is same as at time of previous notification
	            $debug && print "- Note: No topics changed since $time\n";
	            return;
	        }
	        $currLastmodify = $bar[2];
	        $debug && print "- Changed topics since $time: ";
	    }

	    if( $prevLastmodify >= $bar[2] ) {
	        #print "Date: found item of last notification\n";
	        # found item of last notification
	        last;
	    }

	    #create entry in HTML attachment
	    $foo = $text;
	    $foo =~ s/%TOPICNAME%/$bar[0]/go;
	    $wikiuser = &wiki::userToWikiName( $bar[1] );
	    $foo =~ s/%AUTHOR%/$wikiuser/go;
	    $time = &wiki::formatGmTime( $bar[2] );
	    $foo =~ s/%TIME%/$time/go;
	    $foo = &wiki::getRenderedVersion( $foo );

            $head = &wiki::readFileHead( "$dataDir\/$webName\/$bar[0].txt", 16 );
            $head = &wiki::makeTopicSummary( $head, $bar[0], $webName );
            $foo =~ s/%TEXTHEAD%/$head/go;

	    $emailbody = "$emailbody$foo";
	    $exclude{ $bar[0] } = "1";

	    $debug && print "$bar[0] ";

	    #add new item to topic list in email body
	    $foo = "- $bar[0]  ($wikiuser)\n  $scriptUrl/view$scriptSuffix/$webName/$bar[0]\n";
            $foo =~ s/Main\.//go;
	    $topiclist = "$topiclist$foo";
	}
    }

    if( $topiclist eq "" ) {
	$debug && print "- Note: Topic list is empty\n";
	return;
    }
    $debug && print "\n";

    &wiki::saveFile( "$dataDir/$webName/.mailnotify", $currLastmodify );

    $emailbody = "$emailbody$after";

    $text = &wiki::readTemplate( "mailnotify" );
    $text =~ s/%EMAILFROM%/%WIKIWEBMASTER%/go;
    $text =~ s/%EMAILTO%/$notifylist/go;
    $text =~ s/%EMAILBODY%/$emailbody/go;
    $text =~ s/%TOPICLIST%/$topiclist/go;
    $text =~ s/%LASTDATE%/&wiki::formatGmTime($prevLastmodify)/geo;
    $text = &wiki::handleCommonTags( $text, $topic );

    # change absolute addresses to relative ones
    $text =~ s/(href=\")$scriptUrlPath/$1..\/../goi;
    $text =~ s/(action=\")$scriptUrlPath/$1..\/../goi;

    $debug && print "- Sending mail notification to: $notifylist\n";

    if( ! &wiki::sendEmail( $text ) ) {
	print STDERR "- ERROR: TWiki mailnotify can't send mail\n";
        $debug && print "- End Twiki.$webName\n";
    } else {
	$debug && print "- End Twiki.$webName, mail notification sent\n";
    }
}
