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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *     http://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 com.aliyuncs.utils;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.SimpleTimeZone;
import java.util.UUID;

public class ParameterHelper {

    private final static String TIME_ZONE = "GMT";
    private final static String FORMAT_ISO8601 = "yyyy-MM-dd'T'HH:mm:ss'Z'";
    private final static String FORMAT_RFC2616 = "EEE, dd MMM yyyy HH:mm:ss zzz";

    public ParameterHelper() {
    }

    public static String getUniqueNonce() {
        UUID uuid = UUID.randomUUID();
        return uuid.toString();
    }

    public static String getISO8601Time(Date date) {
        Date nowDate = date;
        if (null == date) {
            nowDate = new Date();
        }
        SimpleDateFormat df = new SimpleDateFormat(FORMAT_ISO8601);
        df.setTimeZone(new SimpleTimeZone(0, TIME_ZONE));

        return df.format(nowDate);
    }

    public static String getRFC2616Date(Date date) {
        Date nowDate = date;
        if (null == date) {
            nowDate = new Date();
        }
        SimpleDateFormat df = new SimpleDateFormat(FORMAT_RFC2616, Locale.ENGLISH);
        df.setTimeZone(new SimpleTimeZone(0, TIME_ZONE));
        return df.format(nowDate);
    }

    public static Date parse(String strDate) throws ParseException {
        if (null == strDate || "".equals(strDate)) {
            return null;
        }
        try {
            return parseISO8601(strDate);
        } catch (ParseException exp) {
            return parseRFC2616(strDate);
        }
    }

    public static Date parseISO8601(String strDate) throws ParseException {
        if (null == strDate || "".equals(strDate)) {
            return null;
        }
        SimpleDateFormat df = new SimpleDateFormat(FORMAT_ISO8601);
        df.setTimeZone(new SimpleTimeZone(0, TIME_ZONE));
        return df.parse(strDate);
    }

    public static Date parseRFC2616(String strDate) throws ParseException {
        if (null == strDate || "".equals(strDate) || strDate.length() != FORMAT_RFC2616.length()) {
            return null;
        }
        SimpleDateFormat df = new SimpleDateFormat(FORMAT_RFC2616, Locale.ENGLISH);
        df.setTimeZone(new SimpleTimeZone(0, TIME_ZONE));
        return df.parse(strDate);
    }

    public static String md5Sum(byte[] buff) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] messageDigest = md.digest(buff);
            return Base64Helper.encode(messageDigest);
        } catch (Exception e) {
        }
        return null;
    }

    public static byte[] getFormData(Map params) throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;
        for (Map.Entry entry : params.entrySet()) {
            if (first) {
                first = false;
            } else {
                result.append("&");
            }
            result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
        }
        return result.toString().getBytes("UTF-8");
    }
}