#
# The master SQL module
#
#
#
# Copyright (c) 2006 Dirk Koopman G1TLH
#

package DXSql;

use strict;

use DXDebug;

use vars qw($active);
$active = 0;

sub init
{
	my $dsn = shift;
	return unless $dsn;
	return $active if $active;
	
	eval { 
		require DBI;
	};
	unless ($@) {
		import DBI;
		$active++;
	}
	undef $@;
	return $active;
} 

sub new
{
	my $class = shift;
	my $dsn = shift;
	my $self;
	
	return undef unless $active;
	my $dbh;
	my ($style) = $dsn =~ /^dbi:(\w+):/;
	my $newclass = "DXSql::$style";
	eval "require $newclass";
	if ($@) {
		$active = 0;
		return undef;
	}
	return bless {}, $newclass;
}

sub connect
{
	my $self = shift; 
	my $dsn = shift;
	my $user = shift;
	my $passwd = shift;
	
	my $dbh;
	eval {
		no strict 'refs';
		$dbh = DBI->connect($dsn, $user, $passwd); 
	};
	unless ($dbh) {
		$active = 0;
		return undef;
	}
	$self->{dbh} = $dbh;
	return $self;
}

sub finish
{
	my $self = shift;
	$self->{dbh}->disconnect;
} 

sub do
{
	my $self = shift;
	my $s = shift;
	
	eval { $self->{dbh}->do($s); }; 
}

sub begin_work
{
	$_[0]->{dbh}->begin_work;
}

sub commit
{
	$_[0]->{dbh}->commit;
}

sub rollback
{
	$_[0]->{dbh}->rollback;
}

sub quote
{
	return $_[0]->{dbh}->quote($_[1]);
}

sub prepare
{
	return $_[0]->{dbh}->prepare($_[1]);
}

sub spot_insert_prepare
{
	my $self = shift;
	return $self->prepare('insert into spot values(?' . ',?' x 15 . ')');
}

sub spot_insert
{
	my $self = shift;
	my $spot = shift;
	my $sth = shift;
	
	if ($sth) {
		push @$spot, undef while  @$spot < 15;
		pop @$spot while @$spot > 15;
		eval {$sth->execute(undef, @$spot)};
	} else {
		my $s = "insert into spot values(NULL,";
		$s .= sprintf("%.1f,", $spot->[0]);
		$s .= $self->quote($spot->[1]) . "," ;
		$s .= $spot->[2] . ',';
		$s .= (length $spot->[3] ? $self->quote($spot->[3]) : 'NULL') . ',';
		$s .= $self->quote($spot->[4]) . ',';
		$s .= $spot->[5] . ',';
		$s .= $spot->[6] . ',';
		$s .= (length $spot->[7] ? $self->quote($spot->[7]) : 'NULL') . ',';
		$s .= $spot->[8] . ',';
		$s .= $spot->[9] . ',';
		$s .= $spot->[10] . ',';
		$s .= $spot->[11] . ',';
		$s .= (length $spot->[12] ? $self->quote($spot->[12]) : 'NULL') . ',';
		$s .= (length $spot->[13] ? $self->quote($spot->[13]) : 'NULL') . ',';
		$s .= (length $spot->[14] ? $self->quote($spot->[14]) : 'NULL') . ')';
		eval {$self->do($s)};
	}
}

sub spot_search
{
	my $self = shift;
	my $expr = shift;
	my $dayfrom = shift;
	my $dayto = shift;
	my $n = shift;
	my $dxchan = shift;
	
	dbg("expr: $expr") if isdbg('search');
	if ($expr =~ /\$f/) {
		$expr =~ s/(?:==|eq)/ = /g;
		$expr =~ s/\$f10/spotteritu/g;
		$expr =~ s/\$f11/spottercq/g;
		$expr =~ s/\$f12/spotstate/g;
		$expr =~ s/\$f13/spotterstate/g;
		$expr =~ s/\$f0/freq/g;
		$expr =~ s/\$f1/spotcall/g;
		$expr =~ s/\$f2/time/g;
		$expr =~ s/\$f3/comment/g;
		$expr =~ s/\$f4/spotter/g;
		$expr =~ s/\$f5/spotdxcc/g;
		$expr =~ s/\$f6/spotterdxcc/g;
		$expr =~ s/\$f7/origin/g;
		$expr =~ s/\$f8/spotitu/g;
		$expr =~ s/\$f9/spotcq/g;
		$expr =~ s/\|\|/ or /g;
		$expr =~ s/\&\&/ and /g;
		$expr =~ s/=~\s+m\{\^([%\w]+)[^\}]*\}/ like '$1'/g;
	} else {
		$expr = '';
	}  
	my $fdays = $dayfrom ? "time <= " . ($main::systime - ($dayfrom * 86400)) : "";
	my $days = "time >= " . ($main::systime - ($dayto * 86400));
	my $trange = $fdays ? "($fdays and $days)" : $days;
	$expr .= $expr ? " and $trange" : $trange;
    my $s = qq{select freq,spotcall,time,comment,spotter,spotdxcc,spotterdxcc,
origin,spotitu,spotcq,spotteritu,spottercq,spotstate,spotterstate from spot
where $expr order by time desc limit $n};
    dbg("sql expr: $s") if isdbg('search');
	my $ref = $self->{dbh}->selectall_arrayref($s);
	return @$ref;
}

1;