/*
 * 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.taobao.weex.utils;

import android.content.Context;
import android.text.TextUtils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class WXFileUtils {

  /**
   * Load file in device directory, if not exist, load from asset directory.
   * @param path FilePath
   * @param context Weex Context
   * @return the Content of the file
   */
  public static String loadFileOrAsset(String path, Context context) {
    if (!TextUtils.isEmpty(path)) {
      File file = new File(path);
      if (file.exists()) {
        try {
          FileInputStream fis = new FileInputStream(file);
          return readStreamToString(fis);
        } catch (FileNotFoundException e) {
          e.printStackTrace();
        }
      } else {
        return loadAsset(path, context);
      }
    }
    return "";
  }

  /**
   * Load file in asset directory.
   * @param path FilePath
   * @param context Weex Context
   * @return the Content of the file
   */
  public static String loadAsset(String path, Context context) {
    if (context == null || TextUtils.isEmpty(path)) {
      return null;
    }
    InputStream inputStream = null;
    try {
      inputStream = context.getAssets().open(path);
      return readStreamToString(inputStream);
    } catch (IOException e) {
      e.printStackTrace();
    }
    return "";
  }

  private static String readStreamToString(InputStream inputStream) {
    BufferedReader bufferedReader = null;
    try {
      StringBuilder builder = new StringBuilder(inputStream.available() + 10);
      bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
      char[] data = new char[4096];
      int len = -1;
      while ((len = bufferedReader.read(data)) > 0) {
        builder.append(data, 0, len);
      }

      return builder.toString();
    } catch (IOException e) {
      e.printStackTrace();
      WXLogUtils.e("", e);
    } finally {
      try {
        if (bufferedReader != null)
          bufferedReader.close();
      } catch (IOException e) {
        WXLogUtils.e("WXFileUtils loadAsset: ", e);
      }
      try {
        if (inputStream != null)
          inputStream.close();
      } catch (IOException e) {
        WXLogUtils.e("WXFileUtils loadAsset: ", e);
      }
    }

    return "";
  }

  public static boolean saveFile(String path, byte[] content, Context context) {
    if (TextUtils.isEmpty(path) || content == null || context == null) {
      return false;
    }
    FileOutputStream outStream = null;
    try {
      outStream = new FileOutputStream(path);
      outStream.write(content);
      return true;
    } catch (Exception e) {
      WXLogUtils.e("WXFileUtils saveFile: " + WXLogUtils.getStackTrace(e));
    } finally {
      if (outStream != null) {
        try {
          outStream.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
    return false;
  }

  public static String md5(String  template){
    try {
      if(template == null){
        return  "";
      }
      return  md5(template.getBytes("UTF-8"));
    } catch (UnsupportedEncodingException e) {
      return  "";
    }
  }

  public static String md5(byte[] bts){
    try {
      MessageDigest digest = MessageDigest.getInstance("MD5");
      digest.update(bts);
      BigInteger bigInt = new BigInteger(1, digest.digest());
      return  bigInt.toString(16);
    } catch (NoSuchAlgorithmException e) {;
      return  "";
    }
  }
}