# Module of TWiki Enterprise Collaboration Platform, http://TWiki.org/
#
# Copyright (C) 1999-2006 Peter Thoeny, peter@thoeny.org
# and TWiki Contributors. All Rights Reserved. TWiki Contributors
# are listed in the AUTHORS file in the root of this distribution.
# NOTE: Please extend that file, not this notice.
#
# Additional copyrights apply to some or all of the code in this
# file as follows:
# Based on parts of Ward Cunninghams original Wiki and JosWiki.
# Copyright (C) 1998 Markus Peter - SPiN GmbH (warpi@spin.de)
# Some changes by Dave Harris (drh@bhresearch.co.uk) incorporated
#
# 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. For
# more details read LICENSE in the root of this distribution.
#
# 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.
#
# As per the GPL, removal of this notice is prohibited.

package TWiki::UI::Changes;

use strict;

use TWiki;
use TWiki::Prefs;
use TWiki::Store;
use TWiki::UI;
use TWiki::Merge;
use TWiki::Time;
use Assert;

# Command handler for changes command
sub changes {
    my $session = shift;

    $session->enterContext( 'changes' );

    my $query = $session->{cgiQuery};
    my $webName = $session->{webName};
    my $topic = $session->{topicName};

    TWiki::UI::checkWebExists( $session, $webName, $topic, 'find changes in' );

    my $skin = $session->getSkin();

    my $text = $session->{templates}->readTemplate( 'changes', $skin );

    my( $page, $eachChange, $after) = split( /%REPEAT%/, $text );

    my $changeData = $session->{store}->readMetaData( $webName, 'changes' );
    my @changes = split( /\r?\n/, $changeData );
    unless( $query->param( 'minor' )) {
        @changes = grep { !/\tminor$/ } @changes;
        my $comment = CGI::b( 'Note: ' ).
          'This page is showing major changes only. '.
            CGI::a( { href => $query->url()."/$webName?minor=1",
                      rel => 'nofollow' }, 'View all changes' );
        $comment = CGI::span( { class => 'twikiHelp' }, $comment );
        $page .= $comment;
    }
    my %done = ();
    foreach my $change ( reverse @changes ) {
        my( $changedTopic, $login, $time, $rev ) = split( /\t/, $change );
        unless( $done{$changedTopic} ) {
            next unless $session->{store}->topicExists( $webName, $changedTopic );
            my $thisChange = $eachChange;
            $thisChange =~ s/%TOPICNAME%/$changedTopic/go;
            my $wikiuser = '';
            my $u = $session->{users}->findUser( $login );
            $wikiuser = $u->webDotWikiName() if $u;
            $thisChange =~ s/%AUTHOR%/$wikiuser/go;
            $time = TWiki::Time::formatTime( $time );
            $rev = 1 unless $rev;
            my $srev = 'r' . $rev;
            if( $rev == 1 ) {
                $srev = CGI::span( { class => 'twikiNew' }, 'NEW' );
            }
            $thisChange =~ s/%TIME%/$time/g;
            $thisChange =~ s/%REVISION%/$srev/go;
            $thisChange = $session->{renderer}->getRenderedVersion
              ( $thisChange, $webName, $changedTopic );

            #had to remove the diff's as it was causing problems with unmatched html tags
            my $summary = 
              $session->{renderer}->summariseChanges( $query->{user},
                                                      $webName, $changedTopic,
                                                      $rev );
            $thisChange =~ s/%TEXTHEAD%/$summary/go;
            $page .= $thisChange;
            $done{$changedTopic} = 1;
        }
    }
    if( $TWiki::cfg{Log}{changes} ) {
        # write log entry
        $session->writeLog( 'changes', $webName, '' );
    }
    $page .= $after;

    $page = $session->handleCommonTags( $page, $webName, $topic );
    $page = $session->{renderer}->getRenderedVersion($page, $webName, $topic );

    $session->writeCompletePage( $page );
}

1;