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/*
 * Copyright 2017-2020 original authors
 *
 * 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 io.micronaut.context.exceptions;

import io.micronaut.context.BeanResolutionContext;
import io.micronaut.inject.BeanType;

import java.util.Optional;

/**
 * Thrown when no such beans exists.
 *
 * @author Graeme Rocher
 * @since 1.0
 */
public class BeanInstantiationException extends BeanContextException {

    private final BeanType rootBeanType;

    /**
     * @param message The message
     * @param cause   The throwable
     */
    public BeanInstantiationException(String message, Throwable cause) {
        super(message, cause);
        rootBeanType = null;
    }

    /**
     * @param message The message
     */
    public BeanInstantiationException(String message) {
        super(message);
        rootBeanType = null;
    }

    /**
     * @param resolutionContext The resolution context
     * @param cause             The throwable
     */
    public BeanInstantiationException(BeanResolutionContext resolutionContext, Throwable cause) {
        super(MessageUtils.buildMessage(resolutionContext, cause.getMessage()), cause);
        rootBeanType = resolveRootBeanDefinition(resolutionContext);
    }

    /**
     * @param resolutionContext The resolution context
     * @param message           The message
     */
    public BeanInstantiationException(BeanResolutionContext resolutionContext, String message) {
        super(MessageUtils.buildMessage(resolutionContext, message));
        rootBeanType = resolveRootBeanDefinition(resolutionContext);
    }

    /**
     * @param beanDefinition The bean definition
     * @param cause          The throwable
     * @param             The bean type
     */
    public  BeanInstantiationException(BeanType beanDefinition, Throwable cause) {
        super("Error instantiating bean of type [" + beanDefinition.getName() + "]: " + cause.getMessage(), cause);
        rootBeanType = beanDefinition;
    }

    /**
     * @param beanDefinition The bean definition
     * @param message        The message
     * @param             The bean type
     */
    public  BeanInstantiationException(BeanType beanDefinition, String message) {
        super("Error instantiating bean of type [" + beanDefinition.getName() + "]: " + message);
        rootBeanType = beanDefinition;
    }

    /**
     * @return The reference to the root bean.
     */
    public Optional getRootBeanType() {
        return Optional.ofNullable(rootBeanType);
    }

    /**
     * @param resolutionContext The resolution context
     * @return The reference of the root bean throwing the exception
     */
    private BeanType resolveRootBeanDefinition(BeanResolutionContext resolutionContext) {
        BeanType rootBeanType = null;
        if (resolutionContext != null) {
            BeanResolutionContext.Path path = resolutionContext.getPath();
            if (!path.isEmpty()) {
                BeanResolutionContext.Segment segment = path.peek();
                rootBeanType = segment.getDeclaringType();
            } else {
                rootBeanType = resolutionContext.getRootDefinition();
            }
        }
        return rootBeanType;
    }
}