# Movable Type (r) Open Source (C) 2001-2011 Six Apart, Ltd.
# This program is distributed under the terms of the
# GNU General Public License, version 2.
#
# $Id$

package MT::ObjectDriver::Driver::DBD::SQLite;

use strict;
use warnings;

use Fcntl;
use File::Basename;
use DBI qw(:sql_types);

BEGIN {
    eval "use DBD::SQLite 1.11;";
    if ($@) {
        *bind_param_attributes = sub {
            my ($dbd, $data_type) = @_;
            if ($data_type && $data_type->{type} eq 'blob') {
                return SQL_BLOB;
            }
            return;
        };
    }
};

use base qw(
    MT::ObjectDriver::Driver::DBD::Legacy
    Data::ObjectDriver::Driver::DBD::SQLite
    MT::ErrorHandler
);

sub sql_class {
    require MT::ObjectDriver::SQL::SQLite;
    return 'MT::ObjectDriver::SQL::SQLite';
}

sub ddl_class {
    require MT::ObjectDriver::DDL::SQLite;
    return 'MT::ObjectDriver::DDL::SQLite';
}

sub ts2db {
    sprintf '%04d-%02d-%02d %02d:%02d:%02d', unpack 'A4A2A2A2A2A2', $_[1];
}

sub db2ts {
    my $ts = $_[1];
    $ts =~ s/(?:\+|-)\d{2}$//;
    $ts =~ tr/\- ://d;
    $ts;
}

sub dsn_from_config {
    my $dbd = shift;
    my ($cfg) = @_;

    my $db_file = $cfg->Database;
    require File::Spec;
    if (!File::Spec->file_name_is_absolute($db_file)) {
        $db_file = File::Spec->catfile(MT->instance->config_dir, $db_file);
        $cfg->Database($db_file);
    }
    ## This is ugly but necessary. SQLite only creates files with 0644
    ## permissions, so we can't use umask settings to modify those. So
    ## instead, we have to create the file if it doesn't exist in order
    ## to give it the proper permissions.
    unless (-e $db_file) {
        my $umask = oct $cfg->DBUmask;
        my $old = umask($umask);
        local *JUNK;
        sysopen JUNK, $db_file, O_RDWR|O_CREAT, 0666
            or return undef;
            #or return $driver->error(MT->translate("Can't open '[_1]': [_2]", $db_file, $!));
        close JUNK;
        umask($old);
    }
    unless (-w $db_file) {
        return undef;
        #return $driver->error(MT->translate(
        #    "Your database file ('[_1]') is not writable.", $db_file));
    }
    my $dir = dirname($db_file);
    unless (-w $dir) {
        return undef;
        #return $driver->error(MT->translate(
        #    "Your database directory ('[_1]') is not writable.", $dir));
    }
    my $dsn = 'dbi:';
    $dsn .= $cfg->UseSQLite2 ? 'SQLite2' : 'SQLite';
    $dsn .= ':dbname=' . $cfg->Database;
    $dsn;
}

sub init_dbh {
    my $dbd = shift;
    my($dbh) = @_;
    $dbd->SUPER::init_dbh($dbh);
    $dbh->{sqlite_handle_binary_nulls} = 1;
    return $dbh;
}

my $orig_load_iter;

sub configure {
    my $dbd = shift;
    my ($driver) = @_;
    no warnings 'redefine';
    *MT::ObjectDriver::Driver::DBI::count = \&count;
    eval "use DBD::SQLite 1.14;";
    if ($@) {
        $orig_load_iter        = \&MT::Object::load_iter;
        *MT::Object::load_iter = \&_load_iter;
    }
    $dbd;
}

sub count {
    my $driver = shift;
    my($class, $terms, $args) = @_;

    my $join = $args->{join};
    my $select = 'COUNT(*)';
    if ($join && $join->[3]->{unique}) {
        my $col;
        if ($join->[3]{unique} =~ m/\D/) {
            $col = $args->{join}[3]{unique};
        } else {
            $col = $class->properties->{primary_key};
        }
        my $dbcol = $driver->dbd->db_column_name($class->datasource, $col);
        ## the line below is the only difference from the DBI::count method.
        $args->{count_distinct} = { $col => 1 };
    }

    my $result = $driver->_select_aggregate(
        select   => $select,
        class    => $class,
        terms    => $terms,
        args     => $args,
        override => {
                     order  => '',
                     limit  => undef,
                     offset => undef,
                    },
    );
    delete $args->{count_distinct};
    $result;
}

sub _load_iter {
    my $class = shift;
    my ( $terms, $args ) = @_;
    my $result = $orig_load_iter->( $class, @_ );
    return $result
        if 'CODE' ne ref($result)
            && 'Data::ObjectDriver::Iterator' ne ref($result);

    my @ids;
    while ( my $o = $result->() ) {
        push @ids, $o->id;
    }
    if (@ids) {
        my $iter = sub {
            return if !@ids;
            my $id  = shift @ids;
            my $obj = $class->load($id);
            $obj;
        };

        return $iter if 'CODE' eq ref($result);
        return Data::ObjectDriver::Iterator->new($iter);
    }
    return $result;
}

1;
__END__

=head1 NAME

MT::ObjectDriver::Driver::DBD::SQLite

=head1 METHODS

TODO

=head1 AUTHOR & COPYRIGHT

Please see L<MT/AUTHOR & COPYRIGHT>.

=cut
