/*
 *    Copyright [2021] [wisemapping]
 *
 *   Licensed under WiseMapping Public License, Version 1.0 (the "License").
 *   It is basically the Apache License, Version 2.0 (the "License") plus the
 *   "powered by wisemapping" text requirement on every single page;
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the license at
 *
 *       http://www.wisemapping.org/license
 *
 *   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.
 */
import { Mindmap } from '../..';
import INodeModel from '../model/INodeModel';
import LinkModel from '../model/LinkModel';
import NoteModel from '../model/NoteModel';
import Exporter from './Exporter';

class TxtExporter extends Exporter {
  private mindmap: Mindmap;

  constructor(mindmap: Mindmap) {
    super('txt', 'text/pain');
    this.mindmap = mindmap;
  }

  export(): Promise<string> {
    const { mindmap } = this;

    const branches = mindmap.getBranches();
    const txtStr = this.traverseBranch('', '', branches);
    return Promise.resolve(txtStr);
  }

  private traverseBranch(indent: string, prefix: string, branches: INodeModel[]) {
    let result = '';
    branches
      .forEach((node, index) => {
        result = `${result}${indent}${prefix}${index + 1} ${node.getText() !== undefined ? node.getText() : ''}`;
        node.getFeatures().forEach((f) => {
          const type = f.getType();
          if (type === 'link') {
            result = `${result}\n ${indent}  [Link: ${(f as LinkModel).getUrl()}]`;
          }
          if (type === 'note') {
            result = `${result}\n${indent}  [Note: ${(f as NoteModel).getText()}]`;
          }
        });
        result = `${result}\n`;

        result += this.traverseBranch(`\t${indent}`, `${prefix}${index + 1}.`, node.getChildren());
      });
    return result;
  }
}
export default TxtExporter;