/*
 * Copyright (C) 2016 AriaLyy(https://github.com/AriaLyy/Aria)
 *
 * Licensed 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.arialyy.aria.util;

import android.text.TextUtils;
import com.arialyy.aria.core.download.DownloadEntity;
import com.arialyy.aria.core.download.DownloadGroupEntity;
import com.arialyy.aria.core.loader.IRecordHandler;
import com.arialyy.aria.core.upload.UploadEntity;
import com.arialyy.aria.orm.DbEntity;
import java.lang.reflect.Modifier;
import java.net.HttpURLConnection;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by Lyy on 2016/9/23.
 * 检查帮助类
 */
public class CheckUtil {
  private static final String TAG = "CheckUtil";

  /**
   * 检查ip是否正确
   *
   * @param ip ipv4 地址
   * @return {@code true} ip 正确，{@code false} ip 错误
   */
  public static boolean checkIp(String ip) {
    if (TextUtils.isEmpty(ip) || ip.length() < 7 || ip.length() > 15) {
      return false;
    }
    Pattern p = Pattern.compile(Regular.REG_IP_V4);
    Matcher m = p.matcher(ip);
    return m.find() && m.groupCount() > 0;
  }

  /**
   * 判断http请求是否有效
   * {@link HttpURLConnection#HTTP_BAD_GATEWAY} or {@link HttpURLConnection#HTTP_BAD_METHOD}
   * or {@link HttpURLConnection#HTTP_BAD_REQUEST} 无法重试
   *
   * @param errorCode http 返回码
   * @return {@code true} 无效请求；{@code false} 有效请求
   */
  public static boolean httpIsBadRequest(int errorCode) {
    return errorCode == HttpURLConnection.HTTP_BAD_GATEWAY
        || errorCode == HttpURLConnection.HTTP_BAD_METHOD
        || errorCode == HttpURLConnection.HTTP_BAD_REQUEST;
  }

  /**
   * 判断ftp请求是否有效
   *
   * @return {@code true} 无效请求；{@code false} 有效请求
   */
  public static boolean ftpIsBadRequest(int errorCode) {
    return errorCode >= 400 && errorCode < 600;
  }

  /**
   * 检查和处理下载任务的路径冲突
   *
   * @param isForceDownload true，如果路径冲突，将删除其它任务的记录的
   * @param filePath 文件保存路径
   * @return false 任务不再执行，true 任务继续执行
   */
  public static boolean checkDPathConflicts(boolean isForceDownload, String filePath) {
    if (DbEntity.checkDataExist(DownloadEntity.class, "downloadPath=?", filePath)) {
      if (!isForceDownload) {
        ALog.e(TAG, String.format("下载失败，保存路径【%s】已经被其它任务占用，请设置其它保存路径", filePath));
        return false;
      } else {
        ALog.w(TAG, String.format("保存路径【%s】已经被其它任务占用，当前任务将覆盖该路径的文件", filePath));
        RecordUtil.delTaskRecord(filePath, IRecordHandler.TYPE_DOWNLOAD);
        return true;
      }
    }
    return true;
  }

  /**
   * 检查和处理上传任务的路径冲突
   *
   * @param isForceUpload true，如果路径冲突，将删除其它任务的记录的
   * @param filePath 文件保存路径
   * @return false 任务不再执行，true 任务继续执行
   */
  public static boolean checkUPathConflicts(boolean isForceUpload, String filePath) {
    if (DbEntity.checkDataExist(UploadEntity.class, "filePath=?", filePath)) {
      if (!isForceUpload) {
        ALog.e(TAG, String.format("上传失败，文件路径【%s】已经被其它任务占用，请设置其它文件路径", filePath));
        return false;
      } else {
        ALog.w(TAG, String.format("文件路径【%s】已经被其它任务占用，当前任务将覆盖该路径的文件", filePath));
        RecordUtil.delTaskRecord(filePath, IRecordHandler.TYPE_UPLOAD);
        return true;
      }
    }
    return true;
  }

  /**
   * 检查和处理组合任务的路径冲突
   *
   * @param isForceDownload true，如果路径冲突，将删除其它任务的记录的
   * @param dirPath 文件保存路径
   * @return false 任务不再执行，true 任务继续执行
   */
  public static boolean checkDGPathConflicts(boolean isForceDownload, String dirPath) {
    if (DbEntity.checkDataExist(DownloadGroupEntity.class, "dirPath=?", dirPath)) {
      if (!isForceDownload) {
        ALog.e(TAG, String.format("下载失败，文件夹路径【%s】已经被其它任务占用，请设置其它文件路径", dirPath));
        return false;
      } else {
        ALog.w(TAG, String.format("文件夹路径【%s】已经被其它任务占用，当前任务将覆盖该路径", dirPath));
        RecordUtil.delGroupTaskRecordByPath(dirPath, false);
        return true;
      }
    }
    return true;
  }

  /**
   * 检查成员类是否是静态和public
   */
  public static void checkMemberClass(Class clazz) {
    int modifiers = clazz.getModifiers();
    //ALog.d(TAG, "isMemberClass = "
    //    + clazz.isMemberClass()
    //    + "; isStatic = "
    //    + Modifier.isStatic(modifiers)
    //    + "; isPrivate = "
    //    + Modifier.isPrivate(modifiers));
    if (!clazz.isMemberClass() || !Modifier.isStatic(modifiers)) {
      ALog.e(TAG, String.format("为了防止内存泄漏，请使用静态的成员类(public static class %s)或文件类(%s.java)",
          clazz.getSimpleName(), clazz.getSimpleName()));
    }
  }

  /**
   * 检查分页数据，需要查询的页数，从1开始，如果page小于1 或 num 小于1，则抛出{@link NullPointerException}
   *
   * @param page 从1 开始
   * @param num 每页数量
   */
  public static void checkPageParams(int page, int num) {
    if (page < 1 || num < 1) throw new NullPointerException("page和num不能小于1");
  }

  /**
   * 检测url是否合法
   *
   * @return {@code true} 合法，{@code false} 非法
   */
  public static boolean checkUrl(String url) {
    if (TextUtils.isEmpty(url)) {
      ALog.e(TAG, "url不能为null");
      return false;
    } else if (!url.startsWith("http") && !url.startsWith("ftp") && !url.startsWith("sftp")) {
      ALog.e(TAG, "url【" + url + "】错误");
      return false;
    }
    int index = url.indexOf("://");
    if (index == -1) {
      ALog.e(TAG, "url【" + url + "】不合法");
    }
    return true;
  }

  /**
   * 检测下载链接组是否为null
   *
   * @return true 组合任务url为空
   */
  public static boolean checkDownloadUrlsIsEmpty(List<String> urls) {
    if (urls == null || urls.isEmpty()) {
      ALog.e(TAG, "链接组不能为null");
      return true;
    }
    return false;
  }

  /**
   * 检测上传地址是否为null
   */
  public static void checkUploadPathIsEmpty(String uploadPath) {
    if (TextUtils.isEmpty(uploadPath)) {
      throw new IllegalArgumentException("上传地址不能为null");
    }
  }
}