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package com.alipay.api.internal.util;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayResponse;
import com.alipay.api.internal.parser.json.ObjectJsonParser;
import com.alipay.api.internal.util.json.JSONReader;
import com.alipay.api.internal.util.json.JSONValidatingReader;

/**
 * 系统工具类。
 * 
 * @author carver.gu
 * @since 1.0, Sep 12, 2009
 */
public abstract class AlipayUtils {
    private static String localIp;

    private AlipayUtils() {
    }

    /**
     * 获取文件的真实后缀名。目前只支持JPG, GIF, PNG, BMP四种图片文件。
     * 
     * @param bytes 文件字节流
     * @return JPG, GIF, PNG or null
     */
    public static String getFileSuffix(byte[] bytes) {
        if (bytes == null || bytes.length < 10) {
            return null;
        }

        if (bytes[0] == 'G' && bytes[1] == 'I' && bytes[2] == 'F') {
            return "GIF";
        } else if (bytes[1] == 'P' && bytes[2] == 'N' && bytes[3] == 'G') {
            return "PNG";
        } else if (bytes[6] == 'J' && bytes[7] == 'F' && bytes[8] == 'I' && bytes[9] == 'F') {
            return "JPG";
        } else if (bytes[0] == 'B' && bytes[1] == 'M') {
            return "BMP";
        } else {
            return null;
        }
    }

    /**
     * 获取文件的真实媒体类型。目前只支持JPG, GIF, PNG, BMP四种图片文件。
     * 
     * @param bytes 文件字节流
     * @return 媒体类型(MEME-TYPE)
     */
    public static String getMimeType(byte[] bytes) {
        String suffix = getFileSuffix(bytes);
        String mimeType;

        if ("JPG".equals(suffix)) {
            mimeType = "image/jpeg";
        } else if ("GIF".equals(suffix)) {
            mimeType = "image/gif";
        } else if ("PNG".equals(suffix)) {
            mimeType = "image/png";
        } else if ("BMP".equals(suffix)) {
            mimeType = "image/bmp";
        } else {
            mimeType = "application/octet-stream";
        }

        return mimeType;
    }

    /**
     * 清除字典中值为空的项。
     * 
     * @param  泛型
     * @param map 待清除的字典
     * @return 清除后的字典
     */
    public static  Map cleanupMap(Map map) {
        if (map == null || map.isEmpty()) {
            return null;
        }

        Map result = new HashMap(map.size());
        Set> entries = map.entrySet();

        for (Entry entry : entries) {
            if (entry.getValue() != null) {
                result.put(entry.getKey(), entry.getValue());
            }
        }

        return result;
    }

    /**
     * 把JSON字符串转化为Map结构。
     * 
     * @param body JSON字符串
     * @return Map结构
     */
    public static Map parseJson(String body) {
        JSONReader jr = new JSONValidatingReader();
        Object obj = jr.read(body);
        if (obj instanceof Map) {
            return (Map) obj;
        } else {
            return null;
        }
    }

//    /**
//     * 把JSON字符串解释为对象结构。
//     *
//     * @param  API响应类型
//     * @param json JSON字符串
//     * @param clazz API响应类
//     * @return API响应对象
//     */
    public static  T parseResponse(String json, Class clazz)
                                                                                         throws AlipayApiException {
        ObjectJsonParser parser = new ObjectJsonParser(clazz);
        return parser.parse(json);
    }

//    /**
//     * 获取本机的网络IP
//     */
    public static String getLocalNetWorkIp() {
        if (localIp != null) {
            return localIp;
        }
        try {
            Enumeration netInterfaces = NetworkInterface.getNetworkInterfaces();
            InetAddress ip = null;
            while (netInterfaces.hasMoreElements()) {// 遍历所有的网卡
                NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
                if (ni.isLoopback() || ni.isVirtual()) {// 如果是回环和虚拟网络地址的话继续
                    continue;
                }
                Enumeration addresss = ni.getInetAddresses();
                while (addresss.hasMoreElements()) {
                    InetAddress address = addresss.nextElement();
                    if (address instanceof Inet4Address) {// 这里暂时只获取ipv4地址
                        ip = address;
                        break;
                    }
                }
                if (ip != null) {
                    break;
                }
            }
            if (ip != null) {
                localIp = ip.getHostAddress();
            } else {
                localIp = "127.0.0.1";
            }
        } catch (Exception e) {
            localIp = "127.0.0.1";
        }
        return localIp;
    }

}