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package com.github.ibole.infrastructure.web.servlet.utils;

import com.google.common.collect.Lists;

import org.apache.commons.lang3.StringEscapeUtils;

import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

/**
 * 字符串工具类, 继承org.apache.commons.lang3.StringUtils类
 */
public class StringUtils extends org.apache.commons.lang3.StringUtils {

  private static final char SEPARATOR = '_';
  private static final String CHARSET_NAME = "UTF-8";

  /**
   * 转换为字节数组
   * 
   * @param str String
   * @return byte array
   */
  public static byte[] getBytes(String str) {
    if (str != null) {
      try {
        return str.getBytes(CHARSET_NAME);
      } catch (UnsupportedEncodingException e) {
        return null;
      }
    } else {
      return null;
    }
  }

  /**
   * 转换为字节数组
   * 
   * @param bytes byte[]
   * @return string String
   */
  public static String toString(byte[] bytes) {
    try {
      return new String(bytes, CHARSET_NAME);
    } catch (UnsupportedEncodingException e) {
      return EMPTY;
    }
  }

  /**
   * 是否包含字符串
   * 
   * @param str 验证字符串
   * @param strs 字符串组
   * @return 包含返回true
   */
  public static boolean inString(String str, String... strs) {
    if (str != null) {
      for (String s : strs) {
        if (str.equals(trim(s))) {
          return true;
        }
      }
    }
    return false;
  }

  /**
   * 替换掉HTML标签方法
   * @param html String
   * @return replaced html string
   */
  public static String replaceHtml(String html) {
    if (isBlank(html)) {
      return "";
    }
    String regEx = "<.+?>";
    Pattern p = Pattern.compile(regEx);
    Matcher m = p.matcher(html);
    String s = m.replaceAll("");
    return s;
  }

  /**
   * 替换为手机识别的HTML，去掉样式及属性，保留回车。
   * 
   * @param html String
   * @return replaced html string
   */
  public static String replaceMobileHtml(String html) {
    if (html == null) {
      return "";
    }
    return html.replaceAll("<([a-z]+?)\\s+?.*?>", "<$1>");
  }

  /**
   * 替换为手机识别的HTML，去掉样式及属性，保留回车。
   * 
   * @param txt String
   * @return replaced html string
   */
  public static String toHtml(String txt) {
    if (txt == null) {
      return "";
    }
    return replace(replace(Encodes.escapeHtml(txt), "\n", "
"), "\t", "    ");
  }

  /**
   * 缩略字符串（不区分中英文字符）
   * 
   * @param str 目标字符串
   * @param length 截取长度
   * @return trimmed string
   */
  public static String abbr(String str, int length) {
    if (str == null) {
      return "";
    }
    try {
      StringBuilder sb = new StringBuilder();
      int currentLength = 0;
      for (char c : replaceHtml(StringEscapeUtils.unescapeHtml4(str)).toCharArray()) {
        currentLength += String.valueOf(c).getBytes("GBK").length;
        if (currentLength <= length - 3) {
          sb.append(c);
        } else {
          sb.append("...");
          break;
        }
      }
      return sb.toString();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    }
    return "";
  }

  public static String abbr2(String param, int length) {
    if (param == null) {
      return "";
    }
    StringBuffer result = new StringBuffer();
    int n = 0;
    char temp;
    boolean isCode = false; // 是不是HTML代码
    boolean isHTML = false; // 是不是HTML特殊字符,如 
    for (int i = 0; i < param.length(); i++) {
      temp = param.charAt(i);
      if (temp == '<') {
        isCode = true;
      } else if (temp == '&') {
        isHTML = true;
      } else if (temp == '>' && isCode) {
        n = n - 1;
        isCode = false;
      } else if (temp == ';' && isHTML) {
        isHTML = false;
      }
      try {
        if (!isCode && !isHTML) {
          n += String.valueOf(temp).getBytes("GBK").length;
        }
      } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
      }

      if (n <= length - 3) {
        result.append(temp);
      } else {
        result.append("...");
        break;
      }
    }
    // 取出截取字符串中的HTML标记
    String temp_result = result.toString().replaceAll("(>)[^<>]*(]*/?>",
                "");
    // 去掉成对的HTML标记
    temp_result = temp_result.replaceAll("<([a-zA-Z]+)[^<>]*>(.*?)", "$2");
    // 用正则表达式取出标记
    Pattern p = Pattern.compile("<([a-zA-Z]+)[^<>]*>");
    Matcher m = p.matcher(temp_result);
    List endHTML = Lists.newArrayList();
    while (m.find()) {
      endHTML.add(m.group(1));
    }
    // 补全不成对的HTML标记
    for (int i = endHTML.size() - 1; i >= 0; i--) {
      result.append("");
    }
    return result.toString();
  }

  /**
   * 转换为Double类型
   * @param val Object
   * @return double Double
   * 
   */
  public static Double toDouble(Object val) {
    if (val == null) {
      return 0D;
    }
    try {
      return Double.valueOf(trim(val.toString()));
    } catch (Exception e) {
      return 0D;
    }
  }

  public static Float toFloat(Object val) {
    return toDouble(val).floatValue();
  }

  public static Long toLong(Object val) {
    return toDouble(val).longValue();
  }

  public static Integer toInteger(Object val) {
    return toLong(val).intValue();
  }

  public static String getRemoteAddr(HttpServletRequest request) {
    String remoteAddr = request.getHeader("X-Real-IP");
    if (isNotBlank(remoteAddr)) {
      remoteAddr = request.getHeader("X-Forwarded-For");
    } else if (isNotBlank(remoteAddr)) {
      remoteAddr = request.getHeader("Proxy-Client-IP");
    } else if (isNotBlank(remoteAddr)) {
      remoteAddr = request.getHeader("WL-Proxy-Client-IP");
    }
    return remoteAddr != null ? remoteAddr : request.getRemoteAddr();
  }

  /**
   * 驼峰命名法工具
   * @param s String
   * @return toCamelCase("hello_world") == "helloWorld" toCapitalizeCamelCase("hello_world") ==
   *         "HelloWorld" toUnderScoreCase("helloWorld") = "hello_world"
   */
  public static String toCamelCase(String s) {
    if (s == null) {
      return null;
    }

    s = s.toLowerCase();

    StringBuilder sb = new StringBuilder(s.length());
    boolean upperCase = false;
    for (int i = 0; i < s.length(); i++) {
      char c = s.charAt(i);

      if (c == SEPARATOR) {
        upperCase = true;
      } else if (upperCase) {
        sb.append(Character.toUpperCase(c));
        upperCase = false;
      } else {
        sb.append(c);
      }
    }

    return sb.toString();
  }

  /**
   * 驼峰命名法工具
   * @param s String
   * @return toCamelCase("hello_world") == "helloWorld" toCapitalizeCamelCase("hello_world") ==
   *         "HelloWorld" toUnderScoreCase("helloWorld") = "hello_world"
   */
  public static String toCapitalizeCamelCase(String s) {
    if (s == null) {
      return null;
    }
    s = toCamelCase(s);
    return s.substring(0, 1).toUpperCase() + s.substring(1);
  }

  /**
   * 驼峰命名法工具
   * @param s String
   * @return toCamelCase("hello_world") == "helloWorld" toCapitalizeCamelCase("hello_world") ==
   *         "HelloWorld" toUnderScoreCase("helloWorld") = "hello_world"
   */
  public static String toUnderScoreCase(String s) {
    if (s == null) {
      return null;
    }

    StringBuilder sb = new StringBuilder();
    boolean upperCase = false;
    for (int i = 0; i < s.length(); i++) {
      char c = s.charAt(i);

      boolean nextUpperCase = true;

      if (i < (s.length() - 1)) {
        nextUpperCase = Character.isUpperCase(s.charAt(i + 1));
      }

      if ((i > 0) && Character.isUpperCase(c)) {
        if (!upperCase || !nextUpperCase) {
          sb.append(SEPARATOR);
        }
        upperCase = true;
      } else {
        upperCase = false;
      }

      sb.append(Character.toLowerCase(c));
    }

    return sb.toString();
  }

  /**
   * 转换为JS获取对象值，生成三目运算返回结果
   * 
   * @param objectString 对象串 例如：row.user.id 返回：!row?'':!row.user?'':!row.user.id?'':row.user.id
   * @return js value
   */
  public static String jsGetVal(String objectString) {
    StringBuilder result = new StringBuilder();
    StringBuilder val = new StringBuilder();
    String[] vals = split(objectString, ".");
    for (int i = 0; i < vals.length; i++) {
      val.append("." + vals[i]);
      result.append("!" + (val.substring(1)) + "?'':");
    }
    result.append(val.substring(1));
    return result.toString();
  }

}