use strict;
use warnings;

package Net::Trac::TicketHistoryEntry;

use Any::Moose;
use Net::Trac::TicketPropChange;
use DateTime;
use HTTP::Date;
use URI::Escape qw(uri_escape);

=head1 NAME

Net::Trac::TicketHistoryEntry - A single history entry for a Trac ticket

=head1 DESCRIPTION

This class represents a single item in a Trac ticket history.

=head1 ACCESSORS

=head2 connection

Returns a L<Net::Trac::Connection>.

=head2 author

=head2 date

Returns a L<DateTime> object.

=head2 category

=head2 content

=head2 prop_changes

Returns a hashref (property names as the keys) of
L<Net::Trac::TicketPropChange>s associated with this history entry.

=head2 attachment

if there's attachment, return it, else, return undef

=head2 ticket

A weak reference to the ticket object for this ticket history entry

=head2 is_create

A boolean. Returns true if this is the transaction which created the ticket

=cut

has connection => (
    isa => 'Net::Trac::Connection',
    is  => 'ro'
);

has prop_changes => ( isa => 'HashRef', is => 'rw' );

has is_create => ( isa => 'Bool', is => 'rw', default => 0 );
has author => ( isa => 'Str', is => 'rw' );
has date       => ( isa => 'DateTime',                    is => 'rw' );
has category   => ( isa => 'Str',                         is => 'rw' );
has content    => ( isa => 'Str',                         is => 'rw' );
has attachment => ( isa => 'Net::Trac::TicketAttachment', is => 'rw' );
has ticket     => ( isa => 'Net::Trac::Ticket',           is => 'rw', weak_ref => 1 );

=head1 METHODS

=head2 parse_feed_entry

Takes a feed entry from a ticket history feed and parses it to fill
out the fields of this class.

=cut

sub parse_feed_entry {
    my $self = shift;
    my $e    = shift;

    # We use a reference to a copy of ticket state as it was after this feed
    # entry to interpret what "x added, y removed" meant for absolute values
    # of keywords

    my $ticket_state = shift;

    if ( $e =~ m|<dc:creator>(.*?)</dc:creator>|is ) {
        my $author = $1;
        $self->author($author);
    }

    if ( $e =~ m|<pubDate>(.*?)</pubDate>|is ) {
        my $date = $1;
        $self->date( DateTime->from_epoch( epoch => str2time($date) ) );
    }

    if ( $e =~ m|<category>(.*?)</category>|is ) {
        my $c = $1;
        $self->category($c);
    }

    if ( $e =~ m|<description>\s*(.*?)\s*</description>|is ) {
        my $desc = $1;

        if ( $desc =~ s|^\s*?&lt;ul&gt;(.*?)&lt;/ul&gt;||is ) {
            my $props = $1;
            $self->prop_changes( $self->_parse_props( $props, $ticket_state ) );
        }

        $desc =~ s/&gt;/>/gi;
        $desc =~ s/&lt;/</gi;
        $desc =~ s/&amp;/&/gi;
        $self->content($desc);
    }
}

sub _parse_props {
    my $self         = shift;
    my $raw          = shift || '';
    my $ticket_state = shift;
    $raw =~ s/&gt;/>/gi;
    $raw =~ s/&lt;/</gi;
    $raw =~ s/&amp;/&/gi;

    # throw out the wrapping <li>
    $raw =~ s|^\s*?<li>(.*)</li>\s*?$|$1|is;
    my @prop_lines = split( m#</li>\s*<li>#s, $raw );
    my $props = {};

    foreach my $line (@prop_lines) {
        my ( $prop, $old, $new );
        if ( $line =~ m{<strong>attachment</strong>} ) {
            my ($name) = $line =~ m!<em>(.*?)</em>!;
            my $content =
              $self->connection->_fetch( "/attachment/ticket/"
                  . $self->ticket->id . '/'
                  . uri_escape($name) )
              or next;

            if ( $content =~ m{<div id="content" class="attachment">(.+?)</div>}is ) {
                my $frag = $1;
                my $att  = Net::Trac::TicketAttachment->new(
                    connection => $self->connection,
                    ticket     => $self->ticket->id,
                    filename   => $name,
                );
                $att->_parse_html_chunk($frag);
                $self->attachment($att);
            }

            next;
        }
        if ( $line =~ m{<strong>description</strong>} ) {

            # We can't parse trac's crazy "go read a diff on a webpage handling
            # of descriptions
            next;
        }
        if ( $line =~ m{<strong>(keywords|cc)</strong>(.*)$}is ) {
            my $value_changes = $2;
            $prop = $1;
            my ( @added, @removed );
            if ( $value_changes =~ m{^\s*<em>(.*?)</em> added}is ) {
                my $added = $1;
                @added = split( m{</em>\s*<em>}is, $added );
            }

            if ( $value_changes =~ m{(?:^|added;)\s*<em>(.*)</em> removed}is ) {
                my $removed = $1;
                @removed = split( m{</em>\s*?<em>}is, $removed );

            }

            my @before = ();
            my @after = grep defined && length, split( /\s+/, $ticket_state->{keywords} );
            for my $value (@after) {
                next if grep { $_ eq $value } @added;
                push @before, $value;
            }

            $old = join( ' ', sort ( @before, @removed ) );
            $new = join( ' ', sort (@after) );
            $ticket_state->{$prop} = $old;
        } elsif ( $line =~ m{<strong>(.*?)</strong>\s+changed\s+from\s+<em>(.*?)</em>\s+to\s+<em>(.*?)</em>}is ) {
            $prop = $1;
            $old  = $2;
            $new  = $3;
        } elsif ( $line =~ m{<strong>(.*?)</strong>\s+set\s+to\s+<em>(.*?)</em>}is ) {
            $prop = $1;
            $old  = '';
            $new  = $2;
        } elsif ( $line =~ m{<strong>(.*?)</strong>\s+<em>(.*?)</em>\s+deleted}is ) {
            $prop = $1;
            $old  = $2;
            $new  = '';
        } elsif ( $line =~ m{<strong>(.*?)</strong>\s+deleted}is ) {
            $prop = $1;
            $new  = '';
        } else {
            warn "could not  parse " . $line;
        }

        if ($prop) {
            my $pc = Net::Trac::TicketPropChange->new(
                property  => $prop,
                new_value => $new,
                old_value => $old
            );
            $props->{$prop} = $pc;
        } else {
            warn "I found no prop in $line";
        }
    }
    return $props;
}

=head1 LICENSE

Copyright 2008-2009 Best Practical Solutions.

This package is licensed under the same terms as Perl 5.8.8.

=cut

__PACKAGE__->meta->make_immutable;
no Any::Moose;

1;