/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * 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.
 */

export class StringBuilder {
  private str: Array<string>;

  constructor(value?: string | number | boolean | string[] | StringBuilder) {
    if (typeof value === 'string') {
      this.str = [value];
    } else if (value instanceof Array) {
      this.str = value;
    } else if (value instanceof StringBuilder) {
      this.str = value.str;
    } else if (value) {
      this.str = [value.toString()];
    } else {
      this.str = [];
    }
  }

  get length() {
    return this.str.length;
  }

  append(value: string | number | boolean | string[] | StringBuilder): StringBuilder {
    if (typeof value === 'string') {
      this.str.push(value);
    } else if (value instanceof Array) {
      this.str.push(...value);
    } else if (value instanceof StringBuilder) {
      this.str.push(...value.str);
    } else {
      this.str.push(value.toString());
    }
    return this;
  }

  insert(index: number, value: string | number | boolean | string[] | StringBuilder): void {
    if (typeof value === 'string') {
      this.str.splice(index, 0, value);
    } else if (value instanceof Array) {
      this.str.splice(index, 0, ...value);
    } else if (value instanceof StringBuilder) {
      this.str.splice(index, 0, ...value.str);
    } else {
      this.str.splice(index, 0, value.toString());
    }
  }

  clear() {
    this.str = [];
  }

  remove(start: number, length: number) {
    this.str.splice(start, length);
  }

  replace(substr: string, replacement: string) {
    this.str = this.str.map(s => s === substr ? replacement : s);
  }

  toString(): string {
    return this.str.join('');
  }

  equals(value: StringBuilder) {
    return this.toString() === value.toString();
  }
}