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use strict;
use warnings;

# fix lib paths, some may be relative
BEGIN {
    require File::Spec;
    my @libs = ("@RT_LIB_PATH@", "@LOCAL_LIB_PATH@");
    my $bin_path;

    for my $lib (@libs) {
        unless ( File::Spec->file_name_is_absolute($lib) ) {
            unless ($bin_path) {
                if ( File::Spec->file_name_is_absolute(__FILE__) ) {
                    $bin_path = ( File::Spec->splitpath(__FILE__) )[1];
                }
                else {
                    require FindBin;
                    no warnings "once";
                    $bin_path = $FindBin::Bin;
                }
            }
            $lib = File::Spec->catfile( $bin_path, File::Spec->updir, $lib );
        }
        unshift @INC, $lib;
    }

}

use RT;
RT::LoadConfig();
RT::Init();

@RT::Record::ISA = qw( DBIx::SearchBuilder::Record RT::Base );

use RT::Migrate;
use RT::Migrate::Serializer::JSON;
use Getopt::Long;
use Pod::Usage qw//;
use Time::HiRes qw//;

my %OPT;
GetOptions(
    \%OPT,
    "help|?",
    "verbose|v!",
    "quiet|q!",

    "directory|d=s",
    "force|f!",
    "size|s=i",

    "users!",
    "groups!",
    "deleted!",
    "disabled!",

    "scrips!",
    "acls!",
    "assets!",

    "sync",

    "gc=i",
    "page=i",

    "base=s",
) or Pod::Usage::pod2usage();

Pod::Usage::pod2usage(-verbose => 1) if $OPT{help};

my %args;
$args{Directory}   = $OPT{directory};
$args{Force}       = $OPT{force};
$args{MaxFileSize} = $OPT{size} if $OPT{size};

$args{AllUsers}       = $OPT{users}    if defined $OPT{users};
$args{AllGroups}      = $OPT{groups}   if defined $OPT{groups};
$args{FollowDeleted}  = $OPT{deleted}  if defined $OPT{deleted};
$args{FollowDisabled} = $OPT{disabled} if defined $OPT{disabled};

$args{FollowScrips}  = $OPT{scrips}   if defined $OPT{scrips};
$args{FollowACL}     = $OPT{acls}     if defined $OPT{acls};

$args{FollowAssets} = $OPT{assets} if defined $OPT{assets};

$args{Sync} = 1 if $OPT{sync} || $OPT{base};

$args{GC}   = defined $OPT{gc}   ? $OPT{gc}   : 5000;
$args{Page} = defined $OPT{page} ? $OPT{page} : 100;

my $walker;

my $gnuplot = `which gnuplot`;
my $msg = "";
if (-t STDOUT and not $OPT{verbose} and not $OPT{quiet}) {
    $args{Progress} = RT::Migrate::progress(
        top    => \&gnuplot,
        bottom => sub { print "\n$msg"; $msg = ""; },
        counts => sub { $walker->ObjectCount },
        bars   => [
            qw/Queue User Group GroupMember Attribute CustomField CustomFieldValue
              ObjectCustomField ObjectCustomFieldValue Catalog Asset ACE CustomRole
              Class Article ScripAction ScripCondition Template Scrip/
        ],
        max => { estimate() },
    );
    $args{MessageHandler} = sub {
        print "\r", " "x60, "\r", $_[-1]; $msg = $_[-1];
    };
    $args{Verbose}  = 0;
}
$args{Verbose} = 0 if $OPT{quiet};


$walker = RT::Migrate::Serializer::JSON->new( FollowTickets => 0, FollowTransactions => 0, %args );

my $log = RT::Migrate::setup_logging( $walker->{Directory} => 'initialdata.log' );
print "Logging warnings and errors to $log\n" if $log;

print "Beginning dumping initialdata...";
my %counts = $walker->Export;

my @files = $walker->Files;
print "Wrote @{[scalar @files]} files:\n";
print "    $_\n" for @files;
print "\n";

print "Total object counts:\n";
for (sort {$counts{$b} <=> $counts{$a}} keys %counts) {
    printf "%8d %s\n", $counts{$_}, $_;
}

if ($log and -s $log) {
    print STDERR "\n! Some warnings or errors occurred during initialdata dumping."
                ."\n! Please see $log for details.\n\n";
} else {
    unlink $log;
}

sub estimate {
    $| = 1;
    my %e;

    # Expected types we'll serialize
    my @types = map { "RT::$_" } qw/
      Queue User Group GroupMember Attribute CustomField CustomFieldValue
      ObjectCustomField ObjectCustomFieldValue Catalog Asset ACE CustomRole
      Class Article ScripAction ScripCondition Template Scrip/;

    for my $class (@types) {
        print "Estimating $class count...";
        my $collection;
        if ( $class eq 'RT::ACE' ) {
            $collection = 'RT::ACL';
        }
        else {
            $collection = $class . ( UNIVERSAL::can( $class . 'es', 'new' ) ? 'es' : 's' );
        }

        if ($collection->require) {
            my $objs = $collection->new( RT->SystemUser );
            $objs->FindAllRows;
            $objs->UnLimit;
            $objs->{allow_deleted_search} = 1 if $class eq "RT::Asset";
            $e{$class} = $objs->DBIx::SearchBuilder::Count;
        }
        print "\r", " "x60, "\r";
    }

    return %e;
}


sub gnuplot {
    my ($elapsed, $rows, $cols) = @_;
    my $length = $walker->StackSize;
    my $file = $walker->Directory . "/progress.plot";
    open(my $dat, ">>", $file);
    printf $dat "%10.3f\t%8d\n", $elapsed, $length;
    close $dat;

    if ($rows <= 24 or not $gnuplot) {
        print "\n\n";
    } elsif ($elapsed) {
        my $gnuplot = qx|
            gnuplot -e '
                set term dumb $cols @{[$rows - 12]};
                set xlabel "Seconds";
                unset key;
                set xrange [0:*];
                set yrange [0:*];
                set title "Queue length";
                plot "$file" using 1:2 with lines
            '
        |;
        if ($? == 0 and $gnuplot) {
            $gnuplot =~ s/^(\s*\n)//;
            print $gnuplot;
            unlink $file;
        } else {
            warn "Couldn't run gnuplot (\$? == $?): $!\n";
        }
    } else {
        print "\n" for 1..($rows - 13);
    }
}

use JSON;
my $JSON = JSON->new->pretty->canonical;

sub find_differences {
    my $type           = shift;
    my $base_records   = shift || [];
    my $edited_records = shift || [];

    my ( %base_by_id, %edited_by_id );

    for my $base_record ( @$base_records ) {
        my $id = $base_record->{id};

        if ( !$id ) {
            die "Missing id for this record in base file: " . encode_json( $base_record );
        }
        $base_by_id{$id} = $base_record;
    }

    for my $record ( @$base_records, @$edited_records ) {
        if ( $type eq 'CustomFields' && $record->{Values} ) {
            delete $_->{id} for @{$record->{Values}};
        }

        if ( $record->{CustomFields} ) {
            @{$record->{CustomFields}} = grep { !$_->{Disabled} } @{$record->{CustomFields}};
            delete $_->{id} for @{$record->{CustomFields}};
        }

        if ( $record->{Topics} ) {
            delete $_->{id} for @{$record->{Topics}};
        }
    }

    my @changes;
    for my $edited_record ( @$edited_records ) {
        my $id = delete $edited_record->{id};

        if ( my $base_record = delete $base_by_id{$id} ) {
            delete $base_record->{id};
            next if $JSON->encode( $base_record ) eq $JSON->encode( $edited_record );

            for my $field ( keys %$edited_record ) {

                if ( $field eq 'CustomFields' ) {
                    my ( %cf_base, %cf_edited );
                    for my $ocfv ( @{$base_record->{$field} }) {
                        push @{$cf_base{$ocfv->{CustomField}}}, $ocfv;
                    }

                    for my $ocfv ( @{$edited_record->{$field} }) {
                        push @{$cf_edited{$ocfv->{CustomField}}}, $ocfv;
                    }

                    for my $cf ( keys %cf_edited ) {
                        if ( $JSON->encode( [ $cf_base{$cf} ] ) eq $JSON->encode( [ $cf_edited{$cf} ] ) ) {
                            delete $cf_edited{$cf};
                            delete $cf_base{$cf};
                        }
                    }
                    @{ $base_record->{$field} }   = map { @{ $cf_base{$_} } } sort keys %cf_base;
                    @{ $edited_record->{$field} } = map { @{ $cf_edited{$_} } } sort keys %cf_edited;
                }

                if ( $JSON->encode( [ $base_record->{$field} ] ) eq $JSON->encode( [ $edited_record->{$field} ] ) ) {
                    delete $edited_record->{$field};
                }
            }
            $edited_record->{_Updated} = 1;
            $edited_record->{_Original} = $base_record;
        }
        push @changes, $edited_record;
    }

    for my $base_record ( values %base_by_id ) {
        delete $base_record->{id};
        push @changes, { _Deleted => 1, _Original => $base_record };
    }
    return @changes;
}

if ( $OPT{base} ) {
    my $slurp_json = sub {
        my $file = shift;
        local $/;
        open( my $f, '<encoding(UTF-8)', $file )
          or die "Cannot open initialdata file '$file' for read: $@";
        return JSON->new->decode( scalar <$f> );
    };

    my $base_records = $slurp_json->( $OPT{base} );
    my $edited_records = $slurp_json->( File::Spec->catfile( $walker->{Directory}, 'initialdata.json' ) );

    my %changes;
    for my $type ( keys %$base_records ) {
        my @changes = find_differences( $type, $base_records->{$type}, $edited_records->{$type} );
        $changes{$type} = \@changes if @changes;
    }

    for my $type ( keys %$edited_records ) {
        if ( !$base_records->{$type} ) {
            my @changes = find_differences( $type, [], $edited_records->{$type} );
            $changes{$type} = \@changes if @changes;
        }
    }

    print "\n";
    if ( %changes ) {
        my $file = File::Spec->catfile( $walker->{Directory}, 'changes.json' );
        open my $fh, '>encoding(UTF-8)', $file or die "Can't open $file to write: $!";
        print $fh $JSON->encode(\%changes);

        print "Changes are saved to changes.json\n";
        print "Changes summary:\n";

        for my $name ( sort { @{$changes{$b}} <=> @{$changes{$a}} || $a cmp $b } keys %changes ) {
            my $collection = "RT::$name";
            $collection = 'RT::GroupMembers' if $collection eq 'RT::Members';
            my $class;
            if ( $collection->can( '_SingularClass' ) ) {
                $class = $collection->_SingularClass;
            }
            else {
                $class = $collection;
                $class =~ s!s$!!;
            }
            printf "%8d %s\n", scalar @{$changes{$name}}, $class;
        }
    }
    else {
        print "There are no changes found compared to $OPT{base}\n";
    }
}


=head1 NAME

rt-dump-initialdata - Serialize an RT database to disk

=head1 SYNOPSIS

    rt-validator --check && rt-dump-initialdata

This script is used to write out the objects initialdata supports from
RT database to disk, for later import into a different RT instance.  It
requires that the data in the database be self-consistent, in order to
do so; please make sure that the database being exported passes
validation by L<rt-validator> before attempting to use
C<rt-dump-initialdata>.

While running, it will attempt to estimate the number of remaining
objects to be dumped; these estimates are pessimistic, and will be
incorrect if C<--no-users> or C<--no-groups> is used.

If the controlling terminal is large enough (more than 25 columns high)
and the C<gnuplot> program is installed, it will also show a textual
graph of the queue size over time.

=head2 OPTIONS

=over

=item B<--directory> I<name>

The name of the output directory to write data files to, which should
not exist yet; it is a fatal error if it does.  Defaults to
C<< ./I<$Organization>:I<Date>/ >>, where I<$Organization> is as set in
F<RT_SiteConfig.pm>, and I<Date> is today's date.

=item B<--force>

Remove the output directory before starting.

=item B<--no-users>

By default, all privileged users are dumped; passing C<--no-users>
limits it to only those users which are referenced by dumped tickets
and history, and are thus necessary for internal consistency.

=item B<--no-groups>

By default, all groups are dumped; passing C<--no-groups> limits it
to only system-internal groups, which are needed for internal
consistency.

=item B<--no-assets>

By default, all assets are dumped; passing C<--no-assets> skips
assets during serialization.

=item B<--no-disabled>

By default, all queues, custom fields, etc, including disabled ones, are
dumped; passing C<--no-disabled> skips such disabled records during
serialization.

=item B<--no-deleted>

By default, all assets, including deleted ones, are dumped; passing
C<--no-deleted> skips deleted assets.

=item B<--no-scrips>

By default, all scrips and templates are dumped; passing C<--no-scrips>
skips them.

=item B<--no-acls>

By default, all ACLs are dumped; passing C<--no-acls> skips them.

=item B<--sync>

By default, record ids are ordinarily excluded. Pass C<--sync> to
include record ids if you intend to use this for sync rather than
creating a generic initialdata.

=item B<--base> I<file>

The file path which the to be generated I<initialdata.json> will compare to.
If there are any changes, they will be saved to I<changes.json>.

This option implies C<--sync>.

=item B<--gc> I<n>

Adjust how often the garbage collection sweep is done; lower numbers are
more frequent.  It shares the same code with C<rt-serializer>, See
L<rt-serializer/GARBAGE COLLECTION>.

=item B<--page> I<n>

Adjust how many rows are pulled from the database in a single query.  Disable
paging by setting this to 0.  Defaults to 100.

=item B<--quiet>

Do not show graphical progress UI.

=item B<--verbose>

Do not show graphical progress UI, but rather log was each row is
written out.

=back

=cut