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package org.glassfish.jersey.examples.flight.validation;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.Payload;
import javax.validation.ReportAsSingleViolation;

import org.glassfish.jersey.examples.flight.internal.DataStore;

import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotBlank;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;

/**
 * Check whether the validated value is a valid/existing flight identifier.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER})
@Constraint(validatedBy = ValidFlightId.StringValidator.class)
@NotBlank
@Length(min = 7, max = 7)
@ReportAsSingleViolation
public @interface ValidFlightId {

    String message() default "{not.valid.flight.id}";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};

    public class StringValidator implements ConstraintValidator<ValidFlightId, String> {

        @Override
        public void initialize(final ValidFlightId ann) {
        }

        @Override
        public boolean isValid(final String flightId, final ConstraintValidatorContext ctx) {
            return DataStore.selectFlight(flightId) != null;
        }
    }
}
