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package RequestForm::Validate;

use Moo;
use Data::FormValidator;
use Data::Dumper::Concise;
use Data::FormValidator::Constraints qw(:closures);

use LIMS::Local::Utils;

sub validate { # returns hashref containing errs (fail) or data (pass) keys
    my $self = shift;
    my $vars = shift;
    
    my $defaults = _dfv_defaults();
    my $dfv = Data::FormValidator->new({}, $defaults);
    
    my $dfv_profile = dfv_profile(); # DEBUG($dfv_profile);
    my $results = $dfv->check($vars, $dfv_profile); # DEBUG($results);

    my %h;
    if ( $results->has_invalid or $results->has_missing ) { # warn Dumper $results;
        $h{errs} = $results->msgs;
    }
    else {
        my $data = $results->valid; # warn Dumper $h{data};

        # create dob from day, month & year vals & delete original vals:
        my @date_fields = qw(year month day);
        $data->{dob} = sprintf '%s-%02d-%02d', @{$data}{@date_fields};
        delete $data->{$_} for @date_fields; # warn Dumper $data;

        $h{data} = $data;
    }
    return \%h;
}

sub dfv_profile {
    my @required = qw(
        last_name first_name nhs_number gender location referrer day month year
        specimen diagnosis report_to treatment clinical_details taken_by contact
        datetime doi tb previous hb wbc plt
    );
    my @optional = qw( patient_number sample_ref neut lymph other);
    return {
        required => \@required,
        optional => \@optional,
		field_filters => {
			last_name   => 'uc',
			first_name  => 'lc',
			location    => 'lc',
			referrer    => 'lc',
        },
        constraint_methods => {
            nhs_number => _check_nhs_number(),
            year => _check_date(), # or any required date field
        },
		msgs => {
			constraints => { },
        },
    }
}

sub _dfv_defaults {
    return {
		missing_optional_valid => 1,
		filters => 'trim', # trims white space either side of field param
		msgs => {
			any_errors => 'dfv_errors', # default err__
			format 	   => '<div class="dfv-err text-uppercase">%s</div>',
		},
	};
}

sub _check_nhs_number {
	return sub {
		my $dfv = shift; # warn Dumper $dfv;
		my $nhs_number = shift || return 0; # warn 'NHSNo:'.$nhs_number;
		
		# check_nhsno() return true if valid:
		my $is_valid = LIMS::Local::Utils::check_nhsno( $nhs_number ); # warn $is_valid;
		return $is_valid;
    };   
}

sub _check_date {
	return sub {
		my $dfv = shift; # warn Dumper $dfv;

		my $data = $dfv->get_filtered_data; # warn Dumper $data;
        my $date = join '/', @{$data}{qw/day month year/}; # warn $date;
        my $is_valid = LIMS::Local::Utils::check_date($date); # warn $is_valid;
		return $is_valid;
	};    
}

1;