# Copyright (c) 2006, 2007 - OpenSLX GmbH
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your suggestions, praise, or complaints to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org/
# -----------------------------------------------------------------------------
# SQLite.pm
#    - provides SQLite-specific overrides of the OpenSLX MetaDB API.
# -----------------------------------------------------------------------------
package OpenSLX::MetaDB::SQLite;

use strict;
use warnings;

use base qw(OpenSLX::MetaDB::DBI);

################################################################################
### This class provides a MetaDB backend for SQLite databases.
### - by default the db will be created inside a 'openslxdata-sqlite' directory.
################################################################################
use DBD::SQLite;
use OpenSLX::Basics;

################################################################################
### implementation
################################################################################
sub new
{
    my $class = shift;
    my $self  = {};
    return bless $self, $class;
}

sub databaseExists
{
    my $self = shift;
    
    my $fullDBPath = $self->_getDBPath() . "/$openslxConfig{'db-name'}";
    return -e $fullDBPath;
}

sub dropDatabase
{
    my $self = shift;
    
    if ($self->{dbh}) {
        die "need to disconnect before you can drop the database!";
    }
    
    my $fullDBPath = $self->_getDBPath() . "/$openslxConfig{'db-name'}";
    system("rm -rf $fullDBPath") if -e $fullDBPath;
}

sub connect        ## no critic (ProhibitBuiltinHomonyms)
{
    my $self = shift;

    my $dbSpec = $openslxConfig{'db-spec'};
    if (!defined $dbSpec) {
        # build $dbSpec from individual parameters:
        my $dbPath = $self->_getDBPath;
        system("mkdir -p $dbPath") unless -e $dbPath;
        $dbSpec = "dbname=$dbPath/$openslxConfig{'db-name'}";
    }
    vlog(1, "trying to connect to SQLite-database <$dbSpec>");
    $self->{'dbh'} = DBI->connect(
        "dbi:SQLite:$dbSpec", undef, undef,    
        {PrintError => 0, AutoCommit => 1, sqlite_unicode => 1}
    ) or die _tr("Cannot connect to database <%s> (%s)", $dbSpec, $DBI::errstr);
    return 1;
}

sub schemaRenameTable
{
    my $self      = shift;
    my $oldTable  = shift;
    my $newTable  = shift;
    my $colDescrs = shift;
    my $isSubCmd  = shift;

    my $dbh = $self->{'dbh'};
    vlog(1, "renaming table <$oldTable> to <$newTable>...") unless $isSubCmd;
    my $sql = "ALTER TABLE $oldTable RENAME TO $newTable";
    vlog(3, $sql);
    $dbh->do($sql)
      or croak(_tr(q[Can't rename table <%s> (%s)], $oldTable, $dbh->errstr));
    return;
}

sub schemaAddColumns
{
    my $self              = shift;
    my $table             = shift;
    my $newColDescrs      = shift;
    my $newColDefaultVals = shift;
    my $colDescrs         = shift;
    my $isSubCmd          = shift;

    my $dbh         = $self->{'dbh'};
    my $newColNames = $self->_convertColDescrsToColNamesString($newColDescrs);
    vlog(1, "adding columns <$newColNames> to table <$table>")
      unless $isSubCmd;    
    foreach my $colDescr (@$newColDescrs) {
        my $colDescrString =
          $self->_convertColDescrsToDBNativeString([$colDescr]);
        my $sql = "ALTER TABLE $table ADD COLUMN $colDescrString";
        vlog(3, $sql);
        $dbh->do($sql)
          or croak(_tr(q[Can't add column to table <%s> (%s)], $table,
            $dbh->errstr));
    }
    # if default values have been provided, we apply them now:
    if (defined $newColDefaultVals) {
        $self->_doUpdate($table, undef, $newColDefaultVals);
    }
    return;
}

sub _getDBPath
{
    my $self = shift;

    return "$openslxConfig{'private-path'}/db/sqlite";
}

1;