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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package br.com.anteros.bean.validation;


import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import br.com.anteros.bean.validation.model.ValidationListener;
import br.com.anteros.bean.validation.util.NodeBuilderDefinedContextImpl;
import br.com.anteros.bean.validation.util.NodeImpl;
import br.com.anteros.bean.validation.util.PathImpl;
import br.com.anteros.validation.api.ConstraintValidator;
import br.com.anteros.validation.api.ConstraintValidatorContext;
import br.com.anteros.validation.api.Path;
import br.com.anteros.validation.api.ValidationException;

/**
 * Description: Short-lived {@link ConstraintValidatorContext} implementation passed by
 * a {@link ConstraintValidation} to its adapted {@link ConstraintValidator}. 

 */
public class ConstraintValidatorContextImpl implements ConstraintValidatorContext {
    private final List errorMessages =
          new LinkedList();

    private final ConstraintValidation constraintDescriptor;
    private final GroupValidationContext validationContext;

    private boolean defaultDisabled;

    /**
     * Create a new ConstraintValidatorContextImpl instance.
     * @param validationContext
     * @param aConstraintValidation
     */
    public ConstraintValidatorContextImpl(GroupValidationContext validationContext,
                                          ConstraintValidation aConstraintValidation) {
        this.validationContext = validationContext;
        this.constraintDescriptor = aConstraintValidation;
    }

    /**
     * {@inheritDoc}
     */
    public void disableDefaultConstraintViolation() {
        defaultDisabled = true;
    }

    /**
     * {@inheritDoc}
     */
    public String getDefaultConstraintMessageTemplate() {
        return constraintDescriptor.getMessageTemplate();
    }

    /**
     * {@inheritDoc}
     */
    public ConstraintViolationBuilder buildConstraintViolationWithTemplate(
          String messageTemplate) {
        return new ConstraintViolationBuilderImpl(this, messageTemplate,
              validationContext.getPropertyPath());
    }

    private static final class ConstraintViolationBuilderImpl
          implements ConstraintValidatorContext.ConstraintViolationBuilder {
        private final ConstraintValidatorContextImpl parent;
        private final String messageTemplate;
        private final PathImpl propertyPath;

        /**
         * Create a new ConstraintViolationBuilderImpl instance.
         * @param contextImpl
         * @param template
         * @param path
         */
        ConstraintViolationBuilderImpl(ConstraintValidatorContextImpl contextImpl,
                                       String template, PathImpl path) {
            parent = contextImpl;
            messageTemplate = template;
            propertyPath = path;
        }

        /**
         * {@inheritDoc}
         */
        public NodeBuilderDefinedContext addNode(String name) {
            PathImpl path;
            if (propertyPath.isRootPath()) {
                path = PathImpl.create(name);
            } else {
                path = PathImpl.copy(propertyPath);
                path.addNode(new NodeImpl(name));
            }
            return new NodeBuilderDefinedContextImpl(parent, messageTemplate, path);
        }

        /**
         * {@inheritDoc}
         */
        public ConstraintValidatorContext addConstraintViolation() {
            parent.addError(messageTemplate, propertyPath);
            return parent;
        }
    }

    /**
     * Get the queued error messages.
     * @return List
     */
    public List getErrorMessages() {
        if (defaultDisabled && errorMessages.isEmpty()) {
            throw new ValidationException(
                  "At least one custom message must be created if the default error message gets disabled.");
        }

        List returnedErrorMessages =
              new ArrayList(errorMessages);
        if (!defaultDisabled) {
            returnedErrorMessages.add(new ValidationListener.Error(
                  getDefaultConstraintMessageTemplate(), validationContext.getPropertyPath(),
                  null));
        }
        return returnedErrorMessages;
    }

    /**
     * Get this {@link ConstraintValidatorContext}'s {@link GroupValidationContext}.
     * @return {@link GroupValidationContext}
     */
    public GroupValidationContext getValidationContext() {
        return validationContext;
    }

    /**
     * Add an error message to this {@link ConstraintValidatorContext}.
     * @param messageTemplate
     * @param propertyPath
     */
    public void addError(String messageTemplate, Path propertyPath) {
        errorMessages.add(new ValidationListener.Error(messageTemplate, propertyPath, null));
    }
}