package com.zt.core.dictionary;

import com.zt.common.annotation.Dictionary;
import com.zt.common.constant.Constant;
import com.zt.common.constant.IDictionary;
import com.zt.core.sys.dto.DictDto;
import com.zt.core.sys.dto.DictLeafDto;
import com.zt.modules.sys.dto.DictEnumItemDto;
import com.zt.core.sys.dto.DictItemDto;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
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.AnnotationMetadata;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Component("dictionaryParser")
public class DictionaryParser {

    @Autowired
    private ResourceLoader resourceLoader;

    /**
     * 获取指定包下所有添加了执行注解的方法信息
     *
     * @return
     * @throws Exception
     */
    @Cacheable(value = Constant.Cache.SYS, key = "'dict:code'")
    public List<DictDto> getConstantDicts() {
        List<DictDto> dicts = new ArrayList<>();
        try {
            ResourcePatternResolver resolver = ResourcePatternUtils.getResourcePatternResolver(resourceLoader);
            MetadataReaderFactory metaReader = new CachingMetadataReaderFactory(resourceLoader);
            Resource[] resources = resolver.getResources("classpath*:com/zt/**/*.class");

            for (Resource r : resources) {
                MetadataReader reader = metaReader.getMetadataReader(r);
                dicts.addAll(resolveClass(reader));
            }
        } catch (IOException e) {
        }

        return dicts;
    }

    private List<DictDto> resolveClass(MetadataReader reader) {
        List<DictDto> dicts = new ArrayList<>();
        // 获取注解元数据
        AnnotationMetadata metadata = reader.getAnnotationMetadata();
        // 获取类中Dictionary注解的value属性
        Map<String, Object> attributes = metadata.getAnnotationAttributes(Dictionary.class.getCanonicalName());
        if (attributes == null) {
            return dicts;
        }
        String dictType = (String) attributes.get("type"), dictName = (String) attributes.get("name");
        if (StringUtils.isBlank(dictType) || StringUtils.isBlank(dictName)) {
            return dicts;
        }
        DictLeafDto dictDto = new DictLeafDto(dictType, dictName);

        String className = reader.getClassMetadata().getClassName();
        try {
            List<DictItemDto> dataList = new ArrayList<>();

            Enum[] enums = (Enum[]) Class.forName(className).getEnumConstants();
            for (Enum anEnum : enums) {
                if (anEnum instanceof IDictionary) {
                    IDictionary dictionary = (IDictionary) anEnum;
                    dataList.add(new DictEnumItemDto(((Enum) dictionary).name(), dictionary.getName(), dictionary
                            .getValue()));
                }
            }
            dictDto.setDataList(dataList);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        dicts.add(dictDto);
        return dicts;
    }

}