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/*********************************************************************************
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 * The MIT License (MIT)                                                         *
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 * Copyright (c) 2015-2020 aoju.org and other contributors.                      *
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 * all copies or substantial portions of the Software.                           *
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package org.aoju.bus.limiter.resource;

import org.aoju.bus.core.lang.Symbol;
import org.aoju.bus.core.lang.exception.InstrumentException;
import org.aoju.bus.core.toolkit.ClassKit;
import org.aoju.bus.core.toolkit.CollKit;
import org.aoju.bus.limiter.Parser;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternUtils;
import org.springframework.core.type.MethodMetadata;
import org.springframework.core.type.classreading.AnnotationMetadataReadingVisitor;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.*;

/**
 * @author Kimi Liu
 * @version 6.1.1
 * @since JDK 1.8+
 */
public class LimitedResourceScanner implements LimitedResourceSource {

    static final String DEFAULT_RESOURCE_PATTERN = "**/*.class";
    Map limitedResourceMap = new HashMap<>();
    Map> limitedResourceRegistry = new HashMap<>();
    private String resourcePattern = DEFAULT_RESOURCE_PATTERN;
    private ResourcePatternResolver resourcePatternResolver;
    private MetadataReaderFactory metadataReaderFactory;
    private String basePackage;
    private Collection limiterAnnotationParsers;


    public LimitedResourceScanner(String basePackage, Collection limiterAnnotationParsers, ResourceLoader resourceLoader) {
        this.basePackage = basePackage;
        this.limiterAnnotationParsers = limiterAnnotationParsers;
        this.resourcePatternResolver = ResourcePatternUtils.getResourcePatternResolver(resourceLoader);
        this.metadataReaderFactory = new CachingMetadataReaderFactory(resourceLoader);
    }

    public void scanLimitedResource() {
        try {
            String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +
                    ClassKit.convertClassNameToResourcePath(basePackage) + Symbol.C_SLASH + this.resourcePattern;
            Resource[] resources = this.resourcePatternResolver.getResources(packageSearchPath);
            for (Resource resource : resources) {
                if (resource.isReadable()) {
                    MetadataReader metadataReader = this.metadataReaderFactory.getMetadataReader(resource);
                    AnnotationMetadataReadingVisitor classVisitor = (AnnotationMetadataReadingVisitor) metadataReader.getClassMetadata();
                    if (classVisitor.isInterface() || classVisitor.isAbstract()) {
                        continue;
                    }
                    for (Parser parser : limiterAnnotationParsers) {
                        Set methodMetadata = classVisitor.getAnnotatedMethods(parser.getSupportAnnotation().getName());
                        if (CollKit.isEmpty(methodMetadata)) {
                            continue;
                        }
                        for (MethodMetadata metadata : methodMetadata) {
                            AnnotationAttributes attributes = (AnnotationAttributes) metadata.getAnnotationAttributes(parser.getSupportAnnotation().getName());
                            if (attributes != null) {
                                LimitedResource limitedResource = parser.parseLimiterAnnotation(attributes);
                                if (limitedResource != null) {
                                    String key = metadata.getDeclaringClassName() + Symbol.SHAPE +
                                            metadata.getMethodName() + Symbol.AT
                                            + parser.getSupportAnnotation().getSimpleName();
                                    limitedResourceMap.put(key, limitedResource);
                                    // add to registry
                                    String classMethod = metadata.getDeclaringClassName()
                                            + Symbol.SHAPE + metadata.getMethodName();
                                    if (!limitedResourceRegistry.containsKey(classMethod)) {
                                        List tempList = new ArrayList<>();
                                        tempList.add(limitedResource);
                                        limitedResourceRegistry.put(classMethod, tempList);
                                    } else {
                                        Collection tempList = limitedResourceRegistry.get(classMethod);
                                        tempList.add(limitedResource);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        } catch (IOException e) {
            throw new InstrumentException(e);
        }
    }

    @Override
    public Collection getLimitedResource(Class targetClass, Method method) {
        String key = targetClass.getName() + Symbol.SHAPE + method.getName();
        return limitedResourceRegistry.get(key);
    }

}