#!/usr/bin/perl
# --
# bin/otrs.CheckDB.pl - to check the db access
# Copyright (C) 2001-2015 OTRS AG, http://otrs.com/
# --
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU AFFERO General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
# or see http://www.gnu.org/licenses/agpl.txt.
# --

use strict;
use warnings;

use File::Basename;
use FindBin qw($RealBin);
use lib dirname($RealBin);
use lib dirname($RealBin) . '/Kernel/cpan-lib';
use lib dirname($RealBin) . '/Custom';

use Kernel::Config;
use Kernel::System::Encode;
use Kernel::System::Log;
use Kernel::System::Main;
use Kernel::System::DB;

# create common objects
my %CommonObject = ();
$CommonObject{ConfigObject} = Kernel::Config->new();
$CommonObject{EncodeObject} = Kernel::System::Encode->new(%CommonObject);
$CommonObject{LogObject}    = Kernel::System::Log->new(
    LogPrefix    => 'OTRS-otrs.CheckDB.pl',
    ConfigObject => $CommonObject{ConfigObject},
);
$CommonObject{MainObject} = Kernel::System::Main->new(%CommonObject);
$CommonObject{DBObject}   = Kernel::System::DB->new(%CommonObject);

# print database information
my $DatabaseDSN  = $CommonObject{ConfigObject}->{DatabaseDSN};
my $DatabaseUser = $CommonObject{ConfigObject}->{DatabaseUser};
print "Trying to connect to database\n";
print "DSN: $DatabaseDSN\n";
print "DatabaseUser: $DatabaseUser\n\n";

# check database state
if ( $CommonObject{DBObject} ) {
    $CommonObject{DBObject}->Prepare( SQL => "SELECT * FROM valid" );
    my $Check = 0;
    while ( my @Row = $CommonObject{DBObject}->FetchrowArray() ) {
        $Check++;
    }
    if ( !$Check ) {
        print "Connection successful, but no initial inserts are found!\n";
        exit(1);
    }
    else {
        print "Connected.\n";

        # check for common MySQL issue where default storage engine is different
        # from initial OTRS table; this can happen when MySQL is upgraded from
        # 5.1 > 5.5.
        if ( $CommonObject{DBObject}->{'DB::Type'} eq 'mysql' ) {
            $CommonObject{DBObject}->Prepare(
                SQL => "SHOW VARIABLES WHERE variable_name = 'storage_engine'",
            );
            my $StorageEngine;
            while ( my @Row = $CommonObject{DBObject}->FetchrowArray() ) {
                $StorageEngine = $Row[1];
            }
            $CommonObject{DBObject}->Prepare(
                SQL  => "SHOW TABLE STATUS WHERE engine != ?",
                Bind => [ \$StorageEngine ],
            );
            my @Tables;
            while ( my @Row = $CommonObject{DBObject}->FetchrowArray() ) {
                push @Tables, $Row[0];
            }
            if (@Tables) {
                print "Your storage engine is $StorageEngine.\n";
                print "These tables use a different storage engine:\n\n";
                print join( "\n", sort @Tables );
                print "\n\n *** Please correct these problems! *** \n\n";

                exit(1);
            }
        }

        exit(0);
    }
}
else {
    print "Connection failed.\n";
    exit(1);
}
