/*Copyright ©2017 TommyLemon(https://github.com/TommyLemon/APIAuto)

 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.*/


/**wrapper for request
 * @author Lemon
 * @use JSONRequest.request(...)
 */

const TAG_REQUEST_UTIL = 'RequestUtil';

var URL_BASE = "http://localhost:8080"; // 基地址
var URL_GET = URL_BASE + "/get"; // 常规获取数据方式
var URL_HEAD = URL_BASE + "/head"; // 检查，默认是非空检查，返回数据总数
var URL_GETS = URL_BASE + "/gets"; // 通过POST来GET数据，不显示请求内容和返回结果，一般用于对安全要求比较高的请求
var URL_HEADS = URL_BASE + "/heads"; // 通过POST来HEAD数据，不显示请求内容和返回结果，一般用于对安全要求比较高的请求
var URL_POST = URL_BASE + "/post"; // 新增(或者说插入)数据
var URL_PUT = URL_BASE + "/put"; // 修改数据，只修改传入字段对应的值
var URL_DELETE = URL_BASE + "/delete"; // 删除数据
var APIJSON_METHODS = ["get", "head", "gets", "heads", "post", "put", "delete"]


/**请求，全走HTTP POST
 * @param url
 * @param rq
 */
function request(url, json, notAlertRequest, onreadystatechange) {
  if (json == null || json instanceof Array || (json instanceof Object) == false) {
    alertOfDebug("request  json == null || json instanceof Array || (json instanceof Object) == false !!! >> return null;");
    return null;
  }

  if (url == null || (typeof url != "string")) {
    alertOfDebug("request  url == null || typeof url != string !!! >> return null;");
    return null;
  }
  if (url.length < 3 || url.indexOf(".") < 0) {
    alertOfDebug("request  url.length < 3 || url.indexOf(.) < 0 !!! >> return null;");
    return null;
  }


  var rqf = format(JSON.stringify(json));

  var branch = url.substring(URL_BASE.length + 1, url.length);
  var end = branch.indexOf("/");
  var method = branch.substring(0, end < 0 ? branch.length : end);

  var METHOD = method.toUpperCase();

  if (! notAlertRequest) {
    alert("Request(" + METHOD + "):\n" + rqf);
  }

  var request = new XMLHttpRequest();
  request.open("POST", url, true);
  request.setRequestHeader("Content-type", "application/json");

  request.onreadystatechange = onreadystatechange != null ? onreadystatechange : function () {
    if (request.readyState !== 4) {
      return;
    }

    if (request.status === 200) {
      alert("Response(" + METHOD + "):\n" + format(request.responseText));
    } else {
      alert("Response(" + METHOD + "):\nstatus" + request.status + "\nerror:" + request.error);
    }
  }

  request.send(rqf);
  //原生请求>>>>>>>>>>>>>>>>>>>>>>>>>>


  //JQuery ajax请求<<<<<<<<<<<<<<<<<<<<<<<<<<
  // $.ajax({
  //     type: isGet ? "GET" : "POST",
  //     url: isGet ? url + "/" + rq : url,
  //     contentType: "application/json", //必须
  //     dataType: "json", //返回值类型，非必须
  //     data: isGet ? null : rq,
  //     success: function (response) {
  //         alertOfDebug(response);
  //     }
  // });
  //JQuery ajax请求>>>>>>>>>>>>>>>>>>>>>>>>>>


  //VUE axios请求<<<<<<<<<<<<<<<<<<<<<<<<<<
  // if (isGet) {
  //     axios.get(url + "/" + rq, null)
  //         .then(function (response)    {
  //             console.log(response);
  //         })
  //         .catch(function (error) {
  //             console.log(error);
  //         });
  // } else {
  //     axios({
  //         method: 'post',
  //         url: url + "/",
  //         data: json
  //     }).then(function (response) {
  //         alertOfDebug(response);
  //     }).catch(function (error) {
  //         alertOfDebug(error);
  //     });
  // }
  //VUE axios请求>>>>>>>>>>>>>>>>>>>>>>>>>>

  return request;
}

/**编码JSON，转义所有String
 * @param json 任意类型
 */
function encode(json) {
  // alertOfDebug("encode  before:\n" + format(JSON.stringify(json)));

  if (typeof json == "string") { //json instanceof String) {
    json = encodeURIComponent(json);
  }
  else if (json instanceof Array) {
    // alertOfDebug("encode  json instanceof Array");

    for (var i = 0; i < json.length; i ++) {
      // alertOfDebug("json[" + i + "] = " + format(JSON.stringify(json[i])));
      json[i] = encode(json[i]);
    }
  }
  else if (json instanceof Object) {
    // alertOfDebug("encode  json instanceof Object");
    for (var key in json) {
      // alertOfDebug("encode  json[" + key + "] = " + format(JSON.stringify(json[key])));
      json[key] = encode(json[key]);
    }
  }
  // alertOfDebug("encode  after:\n" + format(JSON.stringify(json)));

  return json;
}

/**解码JSON，反转义所有String
 * @param json 任意类型
 */
function decode(json) {
  // alertOfDebug("decode  before:\n" + format(JSON.stringify(json)));

  if (typeof json == "string") { //json instanceof String) {
    json = decodeURIComponent(json);
  }
  else if (json instanceof Array) {
    // alertOfDebug("decode  json instanceof Array");

    for (var i = 0; i < json.length; i ++) {
      // alertOfDebug("json[" + i + "] = " + format(JSON.stringify(json[i])));
      json[i] = decode(json[i]);
    }
  }
  else if (json instanceof Object) {
    // alertOfDebug("decode  json instanceof Object");
    for (var key in json) {
      // alertOfDebug("decode  json[" + key + "] = " + format(JSON.stringify(json[key])));
      json[key] = decode(json[key]);
    }
  }
  // alertOfDebug("decode  after:\n" + format(JSON.stringify(json)));

  return json;
}

/**编码JSON，转义所有String
 * @param data 任意类型
 */
function toFormData(data) {
  if (data == null) {
    return null
  }
  if (data instanceof Object == false || data instanceof Array) {
    alert('toFormData  data instanceof Object == false || data instanceof Array ! >> return')
    return
  }

  var first = true
  var ret = ''
  for (var key in data) {
    var val = data[key]
    if (typeof val != 'string') {
      val = JSON.stringify(val)
    }
    ret += (first ? '' : '&') + encodeURIComponent(key) + '=' + encodeURIComponent(val)
    first = false
  }
  return ret;
}


/**格式化JSON串
 * @param json
 */
function format(json) {
  try {
    return JSON.stringify(JSON.parse(json), null, "\t");
  } catch(e) {
    log(TAG_REQUEST_UTIL, 'format  try { ... } catch (err) { \n ' + e);
    return json;
  }

  // 导致格式化后代码很难看，像没格式化一样
  // if (json == null || json == '') {
  //   console.log('format  json == null || json == "" >>  return json;');
  //   return json;
  // }
  //
  // if (json instanceof Object) { //避免赋值影响传进来的json
  //   return JSON.stringify(json, null, "\t");
  // }
  //
  // var jsonObj;
  // if (typeof json == 'string'){
  //   try {
  //     jsonObj = JSON.parse(json);
  //   } catch (err) {
  //     console.log('format  try { jsonObj = JSON.parse(json); } catch (err) { \n ' + err);
  //     return json;
  //   }
  // }
  // else {
  //   console.log('format  json type error !');
  //   return json;
  // }
  // return JSON.stringify(jsonObj, null, "\t");
}

function log(tag, msg) {
  //console.log(tag + '.' + msg);
}

/**将json字符串转为JSON对象
 * @param s
 */
function parseJSON(s) {
  if (s instanceof Object) {
    alertOfDebug("parseJSON  s instanceof JSON >> return s;");
    return s;
  }

  if (typeof s != "string") {
    alertOfDebug("parseJSON  typeof json != string >> s = \"\" + s;");
    s = "" + s;
  }
  // alertOfDebug("parseJSON  s = \n" + s);

  return JSON.parse(s);
}

/**测试用的提示
 * @param s
 */
function alertOfDebug(s) {
  // alert(s); //注释掉就都不会弹窗了
}

/**是否为空
 * @param s
 * @returns {boolean}
 */
function isEmpty(s) {
  return s == null || s.trim() == '';
}





//常用请求<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<



/**获取单个对象
 * @param table    String, 对象名，如 "User"
 * @param id       Long, 对象id，如 1
 * @param notAlert 不弹窗显示
 * @param callBack 请求成功回调
 */
function getObject(table, id, notAlert, callBack) {
  alertOfDebug("getObject  table = " + table + "; id = " + id);

  return request(URL_GET, newSingleJSON(table, { "id": id }, null), notAlert, callBack);
}

/**获取数组
 * @param table    String, 对象名，如 "User"
 * @param json     {}, 对象内容，如 {"sex":1}
 * @param count    int, 每页数量
 * @param page     int, 页码
 * @param notAlert 不弹窗显示
 * @param callBack 请求成功回调
 */
function getArray(table, json, count, page, notAlert, callBack) {
  alertOfDebug("getArray  table = " + table + "; count = " + count + "; page = " + page
    + "; json = \n" + format(json));

  return request(URL_GET, newArrayJSON(table, json, count, page), notAlert, callBack);
}

/**新增单个对象
 * @param table    String, 对象名，如 "User"
 * @param json     {}, 对象内容，如 {"sex":1}
 * @param notAlert 不弹窗显示
 * @param callBack 请求成功回调
 */
function postObject(table, json, notAlert, callBack) {
  alertOfDebug("postObject  table = " + table
    + "; json = \n" + format(json));
  var id = json == null ? null : json['id'];
  if (id != null) {
    alertOfDebug('postObject  POST 请求不能设置 id ！');
    return;
  }

  return request(URL_POST, newSingleJSON(table, json, table), notAlert, callBack);
}
/**修改单个对象
 * @param table    String, 对象名，如 "User"
 * @param json     {}, 对象内容，如 {"sex":1}
 * @param notAlert 不弹窗显示
 * @param callBack 请求成功回调
 */
function putObject(table, json, notAlert, callBack) {
  alertOfDebug("putObject  table = " + table
    + "; json = \n" + format(json));
  if (json == null) {
    alertOfDebug('putObject  PUT 请求必须设置 table对象 ！');
    return;
  }
  if (json["id"] == null || json["id"] <= 0) {
    alertOfDebug('putObject  PUT 请求必须设置 id 且 id > 0 ！');
    return;
  }

  return request(URL_PUT, newSingleJSON(table, json, table), notAlert, callBack);
}
/**删除单个对象
 * @param table    String, 对象名，如 "User"
 * @param id       Long, 对象id，如 1
 * @param notAlert 不弹窗显示
 * @param callBack 请求成功回调
 */
function deleteObject(table, id, notAlert, callBack) {
  alertOfDebug("deleteObject  table = " + table + "; id = " + id);
  if (id == null || id <= 0) {
    alertOfDebug('deleteObject  DELETE 请求必须设置 id 且 id > 0 ！');
    return;
  }

  return request(URL_DELETE, newSingleJSON(table, { "id": id }, table), notAlert, callBack);
}

/**修改多个对象
 * @param table    String, 对象名，如 "User"
 * @param json     {}, 对象内容，如 {"sex":1}
 * @param notAlert 不弹窗显示
 * @param callBack 请求成功回调
 */
function putArray(table, json, notAlert, callBack) {
  alertOfDebug("putArray  table = " + table
    + "; json = \n" + format(json));
  var idArray = json == null ? null : json["id{}"];
  if (idArray == null || (idArray instanceof Array) == false) {
    alertOfDebug('putArray  idArray == null || (idArray instanceof Array) == false' +
      '  >>  return;  PUT 请求必须设置 id{}:[] ！');
    return;
  }

  return request(URL_PUT, newSingleJSON(table, json, table + "[]"), notAlert, callBack);
}
/**删除多个对象
 * @param table    String, 对象名，如 "User"
 * @param idArray  [], 对象id数组，如 [1, 2, 3]
 * @param notAlert 不弹窗显示
 * @param callBack 请求成功回调
 */
function deleteArray(table, idArray, notAlert, callBack) {
  alertOfDebug("deleteArray  table = " + table
    + "; idArray = \n" + format(idArray));
  if (idArray == null || (idArray instanceof Array) == false) {
    alertOfDebug('deleteArray  idArray == null ! DELETE 请求必须设置 id{}:[] ！');
    return;
  }

  return request(URL_DELETE, newSingleJSON(table, { "id{}": idArray }, table + "[]"), notAlert, callBack);
}



/**新建单个对象请求
 * @param table    String, 对象名，如 "User"
 * @param json     {}, 对象内容，如 {"sex":1}
 * @param tag      String, 写操作标识，一般来说，操作单个对象时和table相同，操作多个对象时是 table[]
 */
function newSingleJSON(table, json, tag) {
  // alertOfDebug("newSingleJSON  table = " + table + "; tag = " + tag
  //     + "; json = \n" + format(json));

  return parseJSON(newSingleString(table, json, tag));
}
/**新建数组请求
 * @param table    String, 对象名，如 "User"
 * @param json     {}, 对象内容，如 {"sex":1}
 * @param count    int, 每页数量
 * @param page     int, 页码
 */
function newArrayJSON(table, json, count, page) {
  // alertOfDebug("newArrayJSON  table = " + table + "; count = " + count + "; page = " + page
  //     + "; json = \n" + format(json));

  return parseJSON(newArrayString(table, json, count, page));
}


/**新建单个对象请求
 * @param table    String, 对象名，如 "User"
 * @param json     {}, 对象内容，如 {"sex":1}
 * @param tag      String, 写操作标识，一般来说，操作单个对象时和table相同，操作多个对象时是 table[]
 */
function newSingleString(table, json, tag) {
  if (json == null) {
    alertOfDebug('newSingleString  json == null >> return;');
    return;
  }
  // alertOfDebug("newSingleString  table = " + table + "; tag = " + tag
  //     + "; json = \n" + format(json));

  return "{\""
    + table + "\":"
    + JSON.stringify(json)
    + (isEmpty(tag) ? "" : ",\"tag\":\"" + tag + "\"")
    + "}";
}
/**新建数组请求
 * @param table    String, 对象名，如 "User"
 * @param json     {}, 对象内容，如 {"sex":1}
 * @param count    int, 每页数量
 * @param page     int, 页码
 */
function newArrayString(table, json, count, page) {
  if (json == null) {
    alertOfDebug('newArrayString  json == null >> return;');
    return;
  }
  // alertOfDebug("newArrayString  table = " + table + "; count = " + count + "; page = " + page
  //     + "; json = \n" + format(json));

  return "{\"" + table + "[]\":{" + "\"count\":" + count + "," + "\"page\":" + page + ",\""
    + table + "\":" + JSON.stringify(json) + "}}";
}


//常用请求>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
