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package com.yixan.base.web.utils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Pattern;

import org.springframework.context.ApplicationContext;
import org.springframework.context.MessageSource;
import org.springframework.context.NoSuchMessageException;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.web.context.ContextLoader;

import com.yixan.tools.common.util.KeyString;
import com.yixan.tools.common.util.VerifyUtil;

/**
 * 枚举工具类
 *
 * @author zhaohuihua
 * @version V1.0 2015年9月30日
 */
public abstract class EnumUtil {

    private static final Pattern SEPARATOR = Pattern.compile(",");

    /**
     * 解析枚举字符串
     *
     *      * EnumUtil.parse("MALE,FEMALE", Gender.class);
     * --> [ Gender.MALE, Gender.FEMALE ]
     * 
     *
     * @param enums 枚举字符串
     * @param type 枚举类
     * @return 枚举列表
     */
    public static > List parse(String enums, Class type) {
        if (VerifyUtil.isBlank(enums)) {
            return null;
        }
        String[] array = SEPARATOR.split(enums);
        List list = new ArrayList<>();
        for (String i : array) {
            list.add(Enum.valueOf(type, i));
        }
        return list;
    }

    /**
     * 获取枚举对应的描述

     *
     *      * EnumUtil.getEnumsResource(Gender.class, UserState.class);
     * --> { Gender:[{key:"MALE",value:"男"},{key:"FEMALE",value:"女"}], UserState:[...] }
     * 
     *
     * @param list
     * @return
     */
    @SafeVarargs
    public static Map> getEnumsResource(Class>... list) {
        Map> map = new HashMap<>();
        Locale locale = LocaleContextHolder.getLocale();
        ApplicationContext context = ContextLoader.getCurrentWebApplicationContext();

        for (Class> clazz : list) {
            map.put(clazz.getSimpleName(), getEnumResource(clazz, context, locale));
        }

        return map;
    }

    /**
     * 获取枚举对应的描述

     *
     *      * EnumUtil.getEnumResource(Gender.class);
     * --> [{key:"MALE",value:"男"},{key:"FEMALE",value:"女"}]
     * 
     *
     * @param list
     * @return
     */
    public static List getEnumResource(Class> clazz) {
        Locale locale = LocaleContextHolder.getLocale();
        MessageSource context = ContextLoader.getCurrentWebApplicationContext();

        try {
            return getEnumResource(clazz, context, locale);
        } catch (NoSuchMessageException e) {
            if (!locale.getLanguage().equals(Locale.CHINESE.getLanguage())) {
                return getEnumResource(clazz, context, Locale.CHINA);
            } else {
                throw e;
            }
        }
    }

    private static List getEnumResource(Class> clazz, MessageSource context,
            Locale locale) {

        List list = new ArrayList<>();
        Enum[] enums = clazz.getEnumConstants();
        for (Enum e : enums) {
            if (!"NULL".equals(e.name().toUpperCase())) {
                String key = clazz.getSimpleName() + "." + e.name();
                String txt = context.getMessage(key, null, locale);
                list.add(new KeyString(e.name(), txt));
            }
        }
        return list;
    }
}