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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
 *
 * https://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;

import io.micronaut.context.env.Environment;
import io.micronaut.context.exceptions.BeanInstantiationException;
import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.reflect.ReflectionUtils;
import io.micronaut.core.type.Argument;
import io.micronaut.inject.BeanDefinition;
import io.micronaut.inject.ConstructorInjectionPoint;
import io.micronaut.inject.annotation.AbstractEnvironmentAnnotationMetadata;
import io.micronaut.inject.annotation.DefaultAnnotationMetadata;

import io.micronaut.core.annotation.Nullable;
import java.lang.reflect.Constructor;
import java.util.Arrays;
import java.util.Objects;
import java.util.Optional;

/**
 * A constructor injection point for the non-reflection case.
 *
 * @param  The type
 * @author graemerocher
 * @since 1.0
 */
@Internal
class DefaultConstructorInjectionPoint implements ConstructorInjectionPoint, EnvironmentConfigurable {

    private final BeanDefinition declaringBean;
    private final Class declaringType;
    private final Class[] argTypes;
    private final AnnotationMetadata annotationMetadata;
    private final Argument[] arguments;

    private Environment environment;

    /**
     * @param declaringBean      The declaring bean
     * @param declaringType      The declaring class type
     * @param annotationMetadata The annotation metadata
     * @param arguments          The arguments
     */
    DefaultConstructorInjectionPoint(
        BeanDefinition declaringBean,
        Class declaringType,
        AnnotationMetadata annotationMetadata,
        Argument[] arguments) {

        this.argTypes = Argument.toClassArray(arguments);
        this.declaringBean = declaringBean;
        this.declaringType = declaringType;
        if (!(annotationMetadata instanceof DefaultAnnotationMetadata)) {
            this.annotationMetadata = AnnotationMetadata.EMPTY_METADATA;
        } else {
            if (annotationMetadata.hasPropertyExpressions()) {
                this.annotationMetadata = new ConstructorAnnotationMetadata((DefaultAnnotationMetadata) annotationMetadata);
            } else {
                this.annotationMetadata = annotationMetadata;
            }
        }
        this.arguments = arguments == null ? Argument.ZERO_ARGUMENTS : arguments;
    }

    @Override
    public final boolean hasPropertyExpressions() {
        return annotationMetadata.hasPropertyExpressions();
    }

    @Override
    public void configure(Environment environment) {
        this.environment = environment;
    }

    @Override
    public T invoke(Object... args) {
        Optional> potentialConstructor = ReflectionUtils.findConstructor(declaringType, argTypes);
        if (potentialConstructor.isPresent()) {
            return ReflectionConstructorInjectionPoint.invokeConstructor(potentialConstructor.get(), arguments, args);
        }
        throw new BeanInstantiationException("Constructor not found for type: " + this);
    }

    @Override
    public AnnotationMetadata getAnnotationMetadata() {
        return annotationMetadata;
    }

    @Override
    public Argument[] getArguments() {
        return arguments;
    }

    @Override
    public BeanDefinition getDeclaringBean() {
        return declaringBean;
    }

    @Override
    public boolean requiresReflection() {
        return false;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        DefaultConstructorInjectionPoint that = (DefaultConstructorInjectionPoint) o;
        return Objects.equals(declaringType, that.declaringType) &&
            Arrays.equals(argTypes, that.argTypes);
    }

    @Override
    public int hashCode() {

        int result = Objects.hash(declaringType);
        result = 31 * result + Arrays.hashCode(argTypes);
        return result;
    }

    @Override
    public String toString() {
        return declaringType.getName() + "(" + Argument.toString(arguments) + ")";
    }

    /**
     * Internal environment aware annotation metadata delegate.
     */
    private final class ConstructorAnnotationMetadata extends AbstractEnvironmentAnnotationMetadata {

        ConstructorAnnotationMetadata(DefaultAnnotationMetadata targetMetadata) {
            super(targetMetadata);
        }

        @Nullable
        @Override
        protected Environment getEnvironment() {
            return environment;
        }
    }
}