package RequestForm::Validate;

# hides DFV internals from caller - returns hashref with keys depending on pass/fail:
# success: pass => 1 + optional data hashref 
# failure: pass => 0 + error messages

use RequestForm::Class; # provides Moo, Local::MooX::Types & LIMS::Local::Debug::p
with 'RequestForm::Role::PDS';

has settings => ( is => 'ro', isa => HashReference, required => 1 );
has session  => ( is => 'ro', isa => Object, required => 1 );

use Data::FormValidator;
use Data::FormValidator::Constraints qw(:closures);

use LIMS::Local::Utils;

sub validate_form { # returns href, keys = pass (1 or 0) & data OR errs 
    my $self = shift;
    my $vars = shift; # p $vars;
    
    my $defaults = _dfv_defaults();
    my $dfv = Data::FormValidator->new({}, $defaults);
    
    my $dfv_profile = _dfv_profile($vars); # p $dfv_profile;
    my $results = $dfv->check($vars, $dfv_profile); # p $results;

    my %h = ( pass => $results->success ); # true if passed

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

        # create dob as DateTime from day, month & year vals & delete original vals:
        my @date_fields = qw(year month day);
        # send $data to_datetime() - method needs a day, month & year hashref entry
        $data->{dob} = LIMS::Local::Utils::to_datetime($data); # p $data->{dob};
        delete $data->{$_} for @date_fields; # p $data;
        $h{data} = $data;        

        # get result of PDS lookup (unless set to skip):
        unless ( $vars->{_skip_pds} ) {
            $h{pds_result} = $self->patient_demographic_service($data);
        }
    }
    return \%h;
}

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

    return ( $results->has_invalid or $results->has_missing )
        ? { pass => 0, errs => $results->msgs }
        : { pass => 1, data => scalar ($results->valid) }; # want valid() as hashref
}

sub _nhs_number_profile {
    return {
        required => 'nhs_number',
        constraint_methods => {
            nhs_number => _check_nhs_number(),
        },
		field_filters => {
            nhs_number => 'digit', # remove spaces & non-digits
        },
    }
}
sub _dfv_profile {
    my $vars = shift; # p $vars;
    
    my @required = qw(
        last_name first_name nhs_number gender location_name location_id
        referrer day month year specimen report_to treatment requested_by
        contact doi tb previous hb wbc plt 
    );
    
    push @required, $vars->{bcr_abl_req} # different required params:
        ? qw(diagnosis_date phase treatment_date line_num) : qw(clinical_details);
        
    my @optional = qw( middle_name patient_number sample_ref neut lymph other
        pds_code taken_by datetime );
    return {
        required => \@required,
        optional => \@optional,
		field_filters => {
			last_name   => 'uc',
			first_name  => 'lc',
			location    => 'lc',
			referrer    => 'lc',
            nhs_number  => 'digit', # remove spaces & non-digits
            month       => sub { # ensure zero-padded:
                my $var = shift;
                # check numeric or get fatal err if var = 'month' eg M$BDB
                return ($var =~ /\d+/)
                    ? sprintf '%02d', $var
                    : $var;
            },
        },
		dependencies => {
			reason_required => 'reason', # cml monitoring request < min duration
		},
        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-lowercase">%s</div>',
		},
	};
}

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

sub _check_date {
	return sub {
		my $dfv = shift; # p $dfv;

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

1;