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/*
 * Copyright 2017-2022 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.core.annotation.AnnotationUtil;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.annotation.Nullable;
import io.micronaut.core.reflect.GenericTypeUtils;
import io.micronaut.core.type.Argument;
import io.micronaut.inject.BeanDefinition;
import io.micronaut.inject.BeanDefinitionReference;
import io.micronaut.inject.ConstructorInjectionPoint;
import io.micronaut.inject.ExecutableMethod;
import io.micronaut.inject.FieldInjectionPoint;
import io.micronaut.inject.MethodInjectionPoint;

import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Manual injection bean definition.
 *
 * @param  The bean type
 * @since 3.5.0
 */
@Internal
final class NoInjectionBeanDefinition implements BeanDefinition, BeanDefinitionReference {
    private final Class singletonClass;
    private final Map, List>> typeArguments = new HashMap<>();

    private final Qualifier qualifier;

    /**
     * @param singletonClass The singleton class
     * @param qualifier      The qualifier
     */
    NoInjectionBeanDefinition(Class singletonClass, Qualifier qualifier) {
        this.singletonClass = singletonClass;
        this.qualifier = qualifier;
    }

    @Nullable
    public Qualifier getQualifier() {
        return qualifier;
    }

    @Override
    public Qualifier getDeclaredQualifier() {
        return getQualifier();
    }

    @Override
    public Optional> getScope() {
        return Optional.of(javax.inject.Singleton.class);
    }

    @Override
    public Optional getScopeName() {
        return Optional.of(AnnotationUtil.SINGLETON);
    }

    @NonNull
    @Override
    public List> getTypeArguments(Class type) {
        List> result = typeArguments.get(type);
        if (result == null) {
            Class[] classes = type.isInterface() ? GenericTypeUtils.resolveInterfaceTypeArguments(singletonClass, type) : GenericTypeUtils.resolveSuperTypeGenericArguments(singletonClass, type);
            result = Arrays.stream(classes).map((Function>) Argument::of).collect(Collectors.toList());
            typeArguments.put(type, result);
        }

        return result;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

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

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

    @Override
    public boolean isPrimary() {
        return true;
    }

    @Override
    public Class getBeanType() {
        return singletonClass;
    }

    @Override
    public Optional> getDeclaringType() {
        return Optional.empty();
    }

    @Override
    public ConstructorInjectionPoint getConstructor() {
        throw new UnsupportedOperationException("Bean of type [" + getBeanType() + "] is a manually registered singleton that was registered with the context via BeanContext.registerBean(..) and cannot be created directly");
    }

    @Override
    public Collection> getRequiredComponents() {
        return Collections.emptyList();
    }

    @Override
    public Collection> getInjectedMethods() {
        return Collections.emptyList();
    }

    @Override
    public Collection> getInjectedFields() {
        return Collections.emptyList();
    }

    @Override
    public Collection> getPostConstructMethods() {
        return Collections.emptyList();
    }

    @Override
    public Collection> getPreDestroyMethods() {
        return Collections.emptyList();
    }

    @Override
    @NonNull
    public String getName() {
        return singletonClass.getName();
    }

    @Override
    public boolean isEnabled(BeanContext beanContext) {
        return true;
    }

    @Override
    public boolean isEnabled(@NonNull BeanContext context, @Nullable BeanResolutionContext resolutionContext) {
        return true;
    }

    @Override
    public  Optional> findMethod(String name, Class[] argumentTypes) {
        return Optional.empty();
    }

    @Override
    public T inject(BeanContext context, T bean) {
        return bean;
    }

    @Override
    public T inject(BeanResolutionContext resolutionContext, BeanContext context, T bean) {
        return bean;
    }

    @Override
    public Collection> getExecutableMethods() {
        return Collections.emptyList();
    }

    @Override
    public Stream> findPossibleMethods(String name) {
        return Stream.empty();
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        NoInjectionBeanDefinition that = (NoInjectionBeanDefinition) o;
        return singletonClass.equals(that.singletonClass) && Objects.equals(qualifier, that.qualifier);
    }

    @Override
    public int hashCode() {
        return singletonClass.hashCode();
    }

    @Override
    public String getBeanDefinitionName() {
        return singletonClass.getName();
    }

    @Override
    public BeanDefinition load() {
        return this;
    }

    @Override
    public BeanDefinition load(BeanContext context) {
        return this;
    }

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

    @Override
    public boolean isPresent() {
        return true;
    }
}