import BaseModel from "../Models/DatabaseModels/DatabaseBaseModel/DatabaseBaseModel";
import DatabaseProperty from "./Database/DatabaseProperty";
import OneUptimeDate from "./Date";
import DiskSize from "./DiskSize";
import GenericObject from "./GenericObject";
import { JSONArray, JSONObject, JSONValue, ObjectType } from "./JSON";
import SerializableObject from "./SerializableObject";
import SerializableObjectDictionary from "./SerializableObjectDictionary";
import Typeof from "./Typeof";
import JSON5 from "json5";

export default class JSONFunctions {
  public static getSizeOfJSONinGB(obj: JSONObject): number {
    const sizeInBytes: number = Buffer.byteLength(JSON.stringify(obj));
    const sizeToGb: number = DiskSize.byteSizeToGB(sizeInBytes);
    return sizeToGb;
  }

  public static isJSONObjectDifferent(
    obj1: GenericObject,
    obj2: GenericObject,
  ): boolean {
    return JSON.stringify(obj1) !== JSON.stringify(obj2);
  }

  public static nestJson(obj: JSONObject): JSONObject {
    // obj could be in this format:

    /**
     * {
     *"http.url.protocol": "http",
     *"http.url.hostname": "localhost",
     *"http.host": "localhost",
     */

    // we want to convert it to this format:

    /**
     * {
     *
     * "http": {
     *     "url": {
     *        "protocol": "http",
     *       "hostname": "localhost"
     *   },
     *    "host": "localhost",
     *   "method": "POST",
     *  "scheme": "http",
     * "client_ip": "
     * ...
     *
     * },
     */

    const result: JSONObject = {};

    for (const key in obj) {
      const keys: Array<string> = key.split(".");

      let currentObj: JSONObject = result;

      for (let i: number = 0; i < keys.length; i++) {
        const k: string | undefined = keys[i];

        if (!k) {
          continue;
        }

        if (i === keys.length - 1) {
          currentObj[k] = obj[key];
        } else {
          if (!currentObj[k]) {
            currentObj[k] = {};
          }

          currentObj = currentObj[k] as JSONObject;
        }
      }
    }

    return result;
  }

  public static isEmptyObject(
    obj: JSONObject | BaseModel | null | undefined,
  ): boolean {
    if (!obj) {
      return true;
    }

    return Object.keys(obj).length === 0;
  }

  public static removeCircularReferences(obj: JSONObject): JSONObject {
    const cache: any[] = [];
    const returnValue: string = JSON.stringify(
      obj,
      (_key: string, value: any) => {
        if (typeof value === "object" && value !== null) {
          if (cache.includes(value)) {
            return;
          }

          cache.push(value);
        }

        return value;
      },
    );

    return JSON.parse(returnValue);
  }

  public static isEqualObject(
    obj1: JSONObject | undefined,
    obj2: JSONObject | undefined,
  ): boolean {
    // check if all the keys are the same

    if (!obj1 && !obj2) {
      return true;
    }

    if (!obj1 || !obj2) {
      return false;
    }

    const keys1: Array<string> = Object.keys(obj1);
    const keys2: Array<string> = Object.keys(obj2);

    if (keys1.length !== keys2.length) {
      return false;
    }

    for (const key of keys1) {
      if (!keys2.includes(key)) {
        return false;
      }
    }

    // check if all the values are the same

    for (const key of keys1) {
      if (obj1[key] !== obj2[key]) {
        return false;
      }
    }

    return true;
  }

  public static toCompressedString(val: JSONValue): string {
    return JSON.stringify(val, null, 2);
  }

  public static toString(val: JSONValue): string {
    if (typeof val === Typeof.String) {
      return val as string;
    }

    return JSON.stringify(val);
  }

  public static getJSONValueInPath(
    obj: JSONObject,
    path: string,
  ): JSONValue | null {
    const paths: Array<string> = path.split(".");
    let returnValue: JSONObject = obj as JSONObject;
    for (const p of paths) {
      if (!p) {
        continue;
      }

      if (returnValue && returnValue[p as string]!) {
        returnValue = returnValue[p] as JSONObject;
      } else {
        return null;
      }
    }

    return returnValue as JSONValue;
  }

  // this function serializes JSON with Common Objects to JSON that can be stringified.
  public static serialize(val: JSONObject): JSONObject {
    const newVal: JSONObject = {};

    for (const key in val) {
      if (val[key] === undefined) {
        continue;
      }

      if (val[key] === null) {
        newVal[key] = val[key];
      }

      if (Array.isArray(val[key])) {
        const arraySerialize: Array<JSONValue> = [];
        for (const arrVal of val[key] as Array<JSONValue>) {
          arraySerialize.push(this.serializeValue(arrVal));
        }

        newVal[key] = arraySerialize;
      } else {
        newVal[key] = this.serializeValue(val[key] as JSONValue);
      }
    }

    return newVal;
  }

  public static serializeValue(val: JSONValue): JSONValue {
    if (val === null || val === undefined) {
      return val;
    } else if (typeof val === Typeof.String && val.toString().trim() === "") {
      return val;
    } else if (val instanceof BaseModel) {
      return BaseModel.toJSON(val, BaseModel);
    } else if (typeof val === Typeof.Number) {
      return val;
    } else if (ArrayBuffer.isView(val)) {
      return {
        _type: ObjectType.Buffer,
        value: val as Uint8Array,
      };
    } else if (val && val instanceof SerializableObject) {
      return val.toJSON();
    } else if (val && val instanceof Date) {
      return {
        _type: ObjectType.DateTime,
        value: OneUptimeDate.toString(val as Date).toString(),
      };
    } else if (
      typeof val === Typeof.Object &&
      (val as JSONObject)["_type"] &&
      Object.keys(ObjectType).includes((val as JSONObject)["_type"] as string)
    ) {
      return val;
    } else if (typeof val === Typeof.Object) {
      return this.serialize(val as JSONObject);
    }

    return val;
  }

  public static deserializeValue(val: JSONValue): JSONValue {
    if (val === null || val === undefined) {
      return val;
    } else if (typeof val === Typeof.String && val.toString().trim() === "") {
      return val;
    } else if (
      val &&
      typeof val === Typeof.Object &&
      (val as JSONObject)["_type"] &&
      (val as JSONObject)["value"] &&
      ((val as JSONObject)["value"] as JSONObject)["data"] &&
      ((val as JSONObject)["value"] as JSONObject)["type"] &&
      ((val as JSONObject)["value"] as JSONObject)["type"] ===
        ObjectType.Buffer &&
      ((val as JSONObject)["_type"] as string) === ObjectType.Buffer
    ) {
      return Buffer.from(
        ((val as JSONObject)["value"] as JSONObject)["data"] as Uint8Array,
      );
    } else if (val && ArrayBuffer.isView(val)) {
      return Buffer.from(val as Uint8Array);
    } else if (typeof val === Typeof.Number) {
      return val;
    } else if (val instanceof DatabaseProperty) {
      return val;
    } else if (val instanceof SerializableObject) {
      return val;
    } else if (
      val &&
      typeof val === Typeof.Object &&
      (val as JSONObject)["_type"] &&
      SerializableObjectDictionary[(val as JSONObject)["_type"] as string]
    ) {
      return SerializableObjectDictionary[
        (val as JSONObject)["_type"] as string
      ].fromJSON(val);
    } else if (val instanceof Date) {
      return val;
    } else if (typeof val === Typeof.Object) {
      return this.deserialize(val as JSONObject);
    } else if (Array.isArray(val)) {
      const arr: Array<JSONValue> = [];

      for (const v of val) {
        arr.push(this.deserializeValue(v));
      }

      return arr;
    }

    return val;
  }

  public static deserializeArray(array: JSONArray): JSONArray {
    const returnArr: JSONArray = [];

    for (const obj of array) {
      returnArr.push(this.deserialize(obj));
    }

    return returnArr;
  }

  public static serializeArray(array: JSONArray): JSONArray {
    const returnArr: JSONArray = [];

    for (const obj of array) {
      returnArr.push(this.serialize(obj));
    }

    return returnArr;
  }

  public static parse(val: string): JSONObject | JSONArray {
    return JSON5.parse(val);
  }

  public static parseJSONObject(val: string): JSONObject {
    const result: JSONObject | JSONArray = this.parse(val);

    if (Array.isArray(result)) {
      throw new Error("Expected JSONObject, but got JSONArray");
    }

    return result;
  }

  public static parseJSONArray(val: string): JSONArray {
    const result: JSONObject | JSONArray = this.parse(val);

    if (!Array.isArray(result)) {
      throw new Error("Expected JSONArray, but got JSONObject");
    }

    return result;
  }

  public static deserialize(val: JSONObject): JSONObject {
    const newVal: JSONObject = {};
    for (const key in val) {
      if (val[key] === null || val[key] === undefined) {
        newVal[key] = val[key];
      }

      if (Array.isArray(val[key])) {
        const arraySerialize: Array<JSONValue> = [];
        for (const arrVal of val[key] as Array<JSONValue>) {
          arraySerialize.push(this.deserializeValue(arrVal));
        }

        newVal[key] = arraySerialize;
      } else {
        newVal[key] = this.deserializeValue(val[key] as JSONValue);
      }
    }

    return newVal;
  }

  public static toFormattedString(val: JSONValue): string {
    return JSON.stringify(val, null, 4);
  }

  public static anyObjectToJSONObject(val: any): JSONObject {
    return JSON.parse(JSON.stringify(val));
  }

  public static unflattenArray(val: JSONArray): JSONArray {
    const returnArr: JSONArray = [];

    for (const obj of val) {
      returnArr.push(this.unflattenObject(obj as JSONObject));
    }

    return returnArr;
  }

  public static unflattenObject(val: JSONObject): JSONObject {
    const returnObj: JSONObject = {};

    for (const key in val) {
      const keys: Array<string> = key.split(".");
      let currentObj: JSONObject = returnObj;

      for (let i: number = 0; i < keys.length; i++) {
        const k: string | undefined = keys[i];

        if (!k) {
          continue;
        }

        if (i === keys.length - 1) {
          currentObj[k] = val[key];
        } else {
          if (!currentObj[k]) {
            currentObj[k] = {};
          }

          currentObj = currentObj[k] as JSONObject;
        }
      }
    }

    return returnObj;
  }

  public static flattenObject(val: JSONObject): JSONObject {
    const returnObj: JSONObject = {};

    type FlattenFunction = (obj: JSONObject, prefix: string) => void;

    const flatten: FlattenFunction = (
      obj: JSONObject,
      prefix: string,
    ): void => {
      for (const key in obj) {
        if (typeof obj[key] === Typeof.Object) {
          flatten(obj[key] as JSONObject, `${prefix}${key}.`);
        } else {
          returnObj[`${prefix}${key}`] = obj[key];
        }
      }
    };

    flatten(val, "");

    return returnObj;
  }

  public static flattenArray(val: JSONArray): JSONArray {
    const returnArr: JSONArray = [];

    for (const obj of val) {
      returnArr.push(this.flattenObject(obj as JSONObject));
    }

    return returnArr;
  }
}