# 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.

package Bugzilla::Version;

use 5.10.1;
use strict;
use warnings;

use parent qw(Bugzilla::Object Exporter);

@Bugzilla::Version::EXPORT = qw(vers_cmp);

use Bugzilla::Util;
use Bugzilla::Error;

use Scalar::Util qw(blessed);

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

use constant DEFAULT_VERSION => 'unspecified';

use constant DB_TABLE => 'versions';
use constant NAME_FIELD => 'value';
# This is "id" because it has to be filled in and id is probably the fastest.
# We do a custom sort in new_from_list below.
use constant LIST_ORDER => 'id';

use constant DB_COLUMNS => qw(
    id
    value
    product_id
    isactive
);

use constant REQUIRED_FIELD_MAP => {
    product_id => 'product',
};

use constant UPDATE_COLUMNS => qw(
    value
    isactive
);

use constant VALIDATORS => {
    product  => \&_check_product,
    value    => \&_check_value,
    isactive => \&Bugzilla::Object::check_boolean,
};

use constant VALIDATOR_DEPENDENCIES => {
    value => ['product'],
};

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

sub new {
    my $class = shift;
    my $param = shift;
    my $dbh = Bugzilla->dbh;

    my $product;
    if (ref $param and !defined $param->{id}) {
        $product = $param->{product};
        my $name = $param->{name};
        if (!defined $product) {
            ThrowCodeError('bad_arg',
                {argument => 'product',
                 function => "${class}::new"});
        }
        if (!defined $name) {
            ThrowCodeError('bad_arg',
                {argument => 'name',
                 function => "${class}::new"});
        }

        my $condition = 'product_id = ? AND value = ?';
        my @values = ($product->id, $name);
        $param = { condition => $condition, values => \@values };
    }

    unshift @_, $param;
    return $class->SUPER::new(@_);
}

sub new_from_list {
    my $self = shift;
    my $list = $self->SUPER::new_from_list(@_);
    return [sort { vers_cmp(lc($a->name), lc($b->name)) } @$list];
}

sub run_create_validators {
    my $class  = shift;
    my $params = $class->SUPER::run_create_validators(@_);
    my $product = delete $params->{product};
    $params->{product_id} = $product->id;
    return $params;
}

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

    if (!defined $self->{'bug_count'}) {
        $self->{'bug_count'} = $dbh->selectrow_array(qq{
            SELECT COUNT(*) FROM bugs
            WHERE product_id = ? AND version = ?}, undef,
            ($self->product_id, $self->name)) || 0;
    }
    return $self->{'bug_count'};
}

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

    $dbh->bz_start_transaction();
    my ($changes, $old_self) = $self->SUPER::update(@_);

    if (exists $changes->{value}) {
        $dbh->do('UPDATE bugs SET version = ?
                  WHERE version = ? AND product_id = ?',
                  undef, ($self->name, $old_self->name, $self->product_id));
    }
    $dbh->bz_commit_transaction();

    return $changes;
}

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

    $dbh->bz_start_transaction();

    # Products must have at least one version.
    if (scalar(@{$self->product->versions}) == 1) {
        ThrowUserError('version_is_last', { version => $self });
    }

    # The version cannot be removed if there are bugs
    # associated with it.
    if ($self->bug_count) {
        ThrowUserError("version_has_bugs", { nb => $self->bug_count });
    }
    $self->SUPER::remove_from_db();

    $dbh->bz_commit_transaction();
}

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

sub product_id { return $_[0]->{'product_id'}; }
sub is_active  { return $_[0]->{'isactive'};   }

sub product {
    my $self = shift;

    require Bugzilla::Product;
    $self->{'product'} ||= new Bugzilla::Product($self->product_id);
    return $self->{'product'};
}

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

sub set_value    { $_[0]->set('value', $_[1]);    }
sub set_isactive { $_[0]->set('isactive', $_[1]); }

sub _check_value {
    my ($invocant, $name, undef, $params) = @_;
    my $product = blessed($invocant) ? $invocant->product : $params->{product};

    $name = trim($name);
    $name || ThrowUserError('version_blank_name');
    # Remove unprintable characters
    $name = clean_text($name);

    my $version = new Bugzilla::Version({ product => $product, name => $name });
    if ($version && (!ref $invocant || $version->id != $invocant->id)) {
        ThrowUserError('version_already_exists', { name    => $version->name,
                                                   product => $product->name });
    }
    return $name;
}

sub _check_product {
    my ($invocant, $product) = @_;
    $product || ThrowCodeError('param_required',
                    { function => "$invocant->create", param => 'product' });
    return Bugzilla->user->check_can_admin_product($product->name);
}

###############################
#####     Functions        ####
###############################

# This is taken straight from Sort::Versions 1.5, which is not included
# with perl by default.
sub vers_cmp {
    my ($a, $b) = @_;

    # Remove leading zeroes - Bug 344661
    $a =~ s/^0*(\d.+)/$1/;
    $b =~ s/^0*(\d.+)/$1/;

    my @A = ($a =~ /([-.]|\d+|[^-.\d]+)/g);
    my @B = ($b =~ /([-.]|\d+|[^-.\d]+)/g);

    my ($A, $B);
    while (@A and @B) {
        $A = shift @A;
        $B = shift @B;
        if ($A eq '-' and $B eq '-') {
            next;
        } elsif ( $A eq '-' ) {
            return -1;
        } elsif ( $B eq '-') {
            return 1;
        } elsif ($A eq '.' and $B eq '.') {
            next;
        } elsif ( $A eq '.' ) {
            return -1;
        } elsif ( $B eq '.' ) {
            return 1;
        } elsif ($A =~ /^\d+$/ and $B =~ /^\d+$/) {
            if ($A =~ /^0/ || $B =~ /^0/) {
                return $A cmp $B if $A cmp $B;
            } else {
                return $A <=> $B if $A <=> $B;
            }
        } else {
            $A = uc $A;
            $B = uc $B;
            return $A cmp $B if $A cmp $B;
        }
    }
    return @A <=> @B;
}

1;

__END__

=head1 NAME

Bugzilla::Version - Bugzilla product version class.

=head1 SYNOPSIS

    use Bugzilla::Version;

    my $version = new Bugzilla::Version({ name => $name, product => $product_obj });
    my $version = Bugzilla::Version->check({ name => $name, product => $product_obj });
    my $version = Bugzilla::Version->check({ id => $id });

    my $value = $version->name;
    my $product_id = $version->product_id;
    my $product = $version->product;

    my $version = Bugzilla::Version->create(
        { value => $name, product => $product_obj });

    $version->set_value($new_name);
    $version->update();

    $version->remove_from_db;

=head1 DESCRIPTION

Version.pm represents a Product Version 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::Version> are listed
below.

=head1 METHODS

=over

=item C<bug_count()>

=over

=item B<Description>

Returns the total of bugs that belong to the version.

=item B<Params>

none

=item B<Returns>

Integer with the number of bugs.

=back

=back

=head1 FUNCTIONS

=over

=item C<vers_cmp($a, $b)>

=over

=item B<Description>

This is a comparison function, like you would use in C<sort>, except that
it compares two version numbers. So, for example, 2.10 would be greater
than 2.2.

It's based on versioncmp from L<Sort::Versions>, with some Bugzilla-specific
fixes.

=item B<Params>

C<$a> and C<$b> - The versions you want to compare.

=item B<Returns>

C<-1> if C<$a> is less than C<$b>, C<0> if they are equal, or C<1> if C<$a>
is greater than C<$b>.

=back

=back

=cut

=head1 B<Methods in need of POD>

=over

=item DEFAULT_VERSION

=item set_isactive

=item set_value

=item product_id

=item is_active

=item remove_from_db

=item product

=item update

=back