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package CPANPLUS::Backend;

use strict;

use CPANPLUS::Error;
use CPANPLUS::Configure;
use CPANPLUS::Internals;
use CPANPLUS::Internals::Constants;
use CPANPLUS::Module;
use CPANPLUS::Module::Author;
use CPANPLUS::Backend::RV;

use FileHandle;
use File::Spec                  ();
use File::Spec::Unix            ();
use File::Basename              ();
use Params::Check               qw[check];
use Locale::Maketext::Simple    Class => 'CPANPLUS', Style => 'gettext';

$Params::Check::VERBOSE = 1;

use vars qw[@ISA $VERSION];

@ISA     = qw[CPANPLUS::Internals];
$VERSION = "0.9138";

### mark that we're running under CPANPLUS to spawned processes
$ENV{'PERL5_CPANPLUS_IS_RUNNING'} = $$;

### XXX version.pm MAY format this version, if it's in use... :(
### so for consistency, just call ->VERSION ourselves as well.
$ENV{'PERL5_CPANPLUS_IS_VERSION'} = __PACKAGE__->VERSION;

=pod

=head1 NAME

CPANPLUS::Backend - programmer's interface to CPANPLUS

=head1 SYNOPSIS

my $cb      = CPANPLUS::Backend->new;
    my $conf    = $cb->configure_object;

my $author  = $cb->author_tree('KANE');
    my $mod     = $cb->module_tree('Some::Module');
    my $mod     = $cb->parse_module( module => 'Some::Module' );

my @objs    = $cb->search(  type    => TYPE,
                                allow   => [...] );

$cb->flush('all');
    $cb->reload_indices;
    $cb->local_mirror;

=head1 DESCRIPTION

This module provides the programmer's interface to the C<CPANPLUS>
libraries.

=head1 ENVIRONMENT

When C<CPANPLUS::Backend> is loaded, which is necessary for just
about every <CPANPLUS> operation, the environment variable
C<PERL5_CPANPLUS_IS_RUNNING> is set to the current process id.

Additionally, the environment variable C<PERL5_CPANPLUS_IS_VERSION>
will be set to the version of C<CPANPLUS::Backend>.

This information might be useful somehow to spawned processes.

=head1 METHODS

=head2 $cb = CPANPLUS::Backend->new( [CONFIGURE_OBJ] )

This method returns a new C<CPANPLUS::Backend> object.
This also initialises the config corresponding to this object.
You have two choices in this:

=over 4

=item Provide a valid C<CPANPLUS::Configure> object

This will be used verbatim.

=item No arguments

Your default config will be loaded and used.

=back

New will return a C<CPANPLUS::Backend> object on success and die on
failure.

=cut

sub new {
    my $class   = shift;
    my $conf;

if( $_[0] && IS_CONFOBJ->( conf => $_[0] ) ) {
        $conf = shift;
    } else {
        $conf = CPANPLUS::Configure->new() or return;
    }

my $self = $class->SUPER::_init( _conf => $conf );

return $self;
}

=pod

=head2 $href = $cb->module_tree( [@modules_names_list] )

Returns a reference to the CPANPLUS module tree.

If you give it any arguments, they will be treated as module names
and C<module_tree> will try to look up these module names and
return the corresponding module objects instead.

See L<CPANPLUS::Module> for the operations you can perform on a
module object.

=cut

sub module_tree {
    my $self    = shift;
    my $modtree = $self->_module_tree;

if( @_ ) {
        my @rv;
        for my $name ( grep { defined } @_) {

### From John Malmberg: This is failing on VMS
            ### because ODS-2 does not retain the case of
            ### filenames that are created.
            ### The problem is the filename is being converted
            ### to a module name and then looked up in the
            ### %$modtree hash.
            ###
            ### As a fix, we do a search on VMS instead --
            ### more cpu cycles, but it gets around the case
            ### problem --kane
            my ($modobj) = do {
                ON_VMS
                    ? $self->search(
                          type    => 'module',
                          allow   => [qr/^$name$/i],
                      )
                    : $modtree->{$name}
            };

push @rv, $modobj || '';
        }
        return @rv == 1 ? $rv[0] : @rv;
    } else {
        return $modtree;
    }
}

=pod

=head2 $href = $cb->author_tree( [@author_names_list] )

Returns a reference to the CPANPLUS author tree.

If you give it any arguments, they will be treated as author names
and C<author_tree> will try to look up these author names and
return the corresponding author objects instead.

See L<CPANPLUS::Module::Author> for the operations you can perform on
an author object.

=cut

sub author_tree {
    my $self        = shift;
    my $authtree    = $self->_author_tree;

if( @_ ) {
        my @rv;
        for my $name (@_) {
            push @rv, $authtree->{$name} || '';
        }
        return @rv == 1 ? $rv[0] : @rv;
    } else {
        return $authtree;
    }
}

=pod

=head2 $conf = $cb->configure_object;

Returns a copy of the C<CPANPLUS::Configure> object.

See L<CPANPLUS::Configure> for operations you can perform on a
configure object.

=cut

sub configure_object { return shift->_conf() };

=head2 $su = $cb->selfupdate_object;

Returns a copy of the C<CPANPLUS::Selfupdate> object.

See the L<CPANPLUS::Selfupdate> manpage for the operations
you can perform on the selfupdate object.

=cut

sub selfupdate_object { return shift->_selfupdate() };

=pod

=head2 @mods = $cb->search( type => TYPE, allow => AREF, [data => AREF, verbose => BOOL] )

C<search> enables you to search for either module or author objects,
based on their data. The C<type> you can specify is any of the
accessors specified in C<CPANPLUS::Module::Author> or
C<CPANPLUS::Module>. C<search> will determine by the C<type> you
specified whether to search by author object or module object.

You have to specify an array reference of regular expressions or
strings to match against. The rules used for this array ref are the
same as in C<Params::Check>, so read that manpage for details.

The search is an C<or> search, meaning that if C<any> of the criteria
match, the search is considered to be successful.

You can specify the result of a previous search as C<data> to limit
the new search to these module or author objects, rather than the
entire module or author tree.  This is how you do C<and> searches.

Returns a list of module or author objects on success and false
on failure.

See L<CPANPLUS::Module> for the operations you can perform on a
module object.
See L<CPANPLUS::Module::Author> for the operations you can perform on
an author object.

=cut

sub search {
    my $self = shift;
    my $conf = $self->configure_object;
    my %hash = @_;

my ($type);
    my $args = do {
        local $Params::Check::NO_DUPLICATES = 0;
        local $Params::Check::ALLOW_UNKNOWN = 1;

my $tmpl = {
            type    => { required => 1, allow => [CPANPLUS::Module->accessors(),
                            CPANPLUS::Module::Author->accessors()], store => \$type },
            allow   => { required => 1, default => [ ], strict_type => 1 },
        };

check( $tmpl, \%hash )
    } or return;

### figure out whether it was an author or a module search
    ### when ambiguous, it'll be an author search.
    my $aref;
    if( grep { $type eq $_ } CPANPLUS::Module::Author->accessors() ) {
        $aref = $self->_search_author_tree( %$args );
    } else {
        $aref = $self->_search_module_tree( %$args );
    }

return @$aref if $aref;
    return;
}

=pod

=head2 $backend_rv = $cb->fetch( modules => \@mods )

Fetches a list of modules. C<@mods> can be a list of distribution
names, module names or module objects--basically anything that
L<parse_module> can understand.

See the equivalent method in C<CPANPLUS::Module> for details on
other options you can pass.