# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.

use strict;

package Bugzilla::Classification;

use Bugzilla::Constants;
use Bugzilla::Field;
use Bugzilla::Util;
use Bugzilla::Error;
use Bugzilla::Product;

use base qw(Bugzilla::Field::ChoiceInterface Bugzilla::Object Exporter);
@Bugzilla::Classification::EXPORT = qw(sort_products_by_classification);

###############################
####    Initialization     ####
###############################

use constant DB_TABLE => 'classifications';
use constant LIST_ORDER => 'sortkey, name';

use constant DB_COLUMNS => qw(
    id
    name
    description
    sortkey
);

use constant UPDATE_COLUMNS => qw(
    name
    description
    sortkey
);

use constant VALIDATORS => {
    name        => \&_check_name,
    description => \&_check_description,
    sortkey     => \&_check_sortkey,
};

###############################
####     Constructors     #####
###############################
sub remove_from_db {
    my $self = shift;
    my $dbh = Bugzilla->dbh;

    ThrowUserError("classification_not_deletable") if ($self->id == 1);

    $dbh->bz_start_transaction();
    # Reclassify products to the default classification, if needed.
    $dbh->do("UPDATE products SET classification_id = 1
              WHERE classification_id = ?", undef, $self->id);

    $self->SUPER::remove_from_db();

    $dbh->bz_commit_transaction();

}

###############################
####      Validators       ####
###############################

sub _check_name {
    my ($invocant, $name) = @_;

    $name = trim($name);
    $name || ThrowUserError('classification_not_specified');

    if (length($name) > MAX_CLASSIFICATION_SIZE) {
        ThrowUserError('classification_name_too_long', {'name' => $name});
    }

    my $classification = new Bugzilla::Classification({name => $name});
    if ($classification && (!ref $invocant || $classification->id != $invocant->id)) {
        ThrowUserError("classification_already_exists", { name => $classification->name });
    }
    return $name;
}

sub _check_description {
    my ($invocant, $description) = @_;

    $description  = trim($description || '');
    return $description;
}

sub _check_sortkey {
    my ($invocant, $sortkey) = @_;

    $sortkey ||= 0;
    my $stored_sortkey = $sortkey;
    if (!detaint_natural($sortkey) || $sortkey > MAX_SMALLINT) {
        ThrowUserError('classification_invalid_sortkey', { 'sortkey' => $stored_sortkey });
    }
    return $sortkey;
}

#####################################
# Implement Bugzilla::Field::Choice #
#####################################

use constant FIELD_NAME => 'classification';
use constant is_default => 0;
use constant is_active => 1;

###############################
####       Methods         ####
###############################

sub set_name        { $_[0]->set('name', $_[1]); }
sub set_description { $_[0]->set('description', $_[1]); }
sub set_sortkey     { $_[0]->set('sortkey', $_[1]); }

sub product_count {
    my $self = shift;
    my $dbh = Bugzilla->dbh;

    if (!defined $self->{'product_count'}) {
        $self->{'product_count'} = $dbh->selectrow_array(q{
            SELECT COUNT(*) FROM products
            WHERE classification_id = ?}, undef, $self->id) || 0;
    }
    return $self->{'product_count'};
}

sub products {
    my $self = shift;
    my $dbh = Bugzilla->dbh;

    if (!$self->{'products'}) {
        my $product_ids = $dbh->selectcol_arrayref(q{
            SELECT id FROM products
            WHERE classification_id = ?
            ORDER BY name}, undef, $self->id);

        $self->{'products'} = Bugzilla::Product->new_from_list($product_ids);
    }
    return $self->{'products'};
}

###############################
####      Accessors        ####
###############################

sub description { return $_[0]->{'description'}; }
sub sortkey     { return $_[0]->{'sortkey'};     }


###############################
####       Helpers         ####
###############################

# This function is a helper to sort products to be listed
# in global/choose-product.html.tmpl.

sub sort_products_by_classification {
    my $products = shift;
    my $list;

    if (Bugzilla->params->{'useclassification'}) {
        my $class = {};
        # Get all classifications with at least one product.
        foreach my $product (@$products) {
            $class->{$product->classification_id}->{'object'} ||=
                new Bugzilla::Classification($product->classification_id);
            # Nice way to group products per classification, without querying
            # the DB again.
            push(@{$class->{$product->classification_id}->{'products'}}, $product);
        }
        $list = [sort {$a->{'object'}->sortkey <=> $b->{'object'}->sortkey
                       || lc($a->{'object'}->name) cmp lc($b->{'object'}->name)}
                      (values %$class)];
    }
    else {
        $list = [{object => undef, products => $products}];
    }
    return $list;
}

1;

__END__

=head1 NAME

Bugzilla::Classification - Bugzilla classification class.

=head1 SYNOPSIS

    use Bugzilla::Classification;

    my $classification = new Bugzilla::Classification(1);
    my $classification = new Bugzilla::Classification({name => 'Acme'});

    my $id = $classification->id;
    my $name = $classification->name;
    my $description = $classification->description;
    my $sortkey = $classification->sortkey;
    my $product_count = $classification->product_count;
    my $products = $classification->products;

=head1 DESCRIPTION

Classification.pm represents a classification object. It is an
implementation of L<Bugzilla::Object>, and thus provides all methods
that L<Bugzilla::Object> provides.

The methods that are specific to C<Bugzilla::Classification> are listed
below.

A Classification is a higher-level grouping of Products.

=head1 METHODS

=over

=item C<product_count()>

 Description: Returns the total number of products that belong to
              the classification.

 Params:      none.

 Returns:     Integer - The total of products inside the classification.

=item C<products>

 Description: Returns all products of the classification.

 Params:      none.

 Returns:     A reference to an array of Bugzilla::Product objects.

=back

=head1 SUBROUTINES

=over

=item C<sort_products_by_classification>

 Description: This is a helper which returns a list of products sorted
              by classification in a form suitable to be passed to the
              global/choose-product.html.tmpl template.

 Params:      An arrayref of product objects.

 Returns:     An arrayref of hashes suitable to be passed to
              global/choose-product.html.tmpl.

=back

=cut
