backend/src/services/lab8/lab8.service.js - main - Coderdev/web-nodejs-labs

backend/src/services/lab8/lab8.service.js
80 строк3 KB
Coderdev
13 апр 2026, 21:35
13 апр 2026, 21:35d23c89a
import fs from 'fs/promises';
import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const task1Path = path.join(__dirname, '..', '..', '..', 'data', 'task1.txt');
const task2GroupsPath = path.join(__dirname, '..', '..', '..', 'data', 'task2', 'groups.json');
const task2StadiumPath = path.join(__dirname, '..', '..', '..', 'data', 'task2', 'stadium.json');
const task3ResultsPath = path.join(__dirname, '..', '..', '..', 'data', 'task3', 'resultsQatar22.json');

class Lab8Service {
  async readJson(filePath, fallback = []) {
    try {
      const data = await fs.readFile(filePath, 'utf8');
      return JSON.parse(data);
    } catch (error) {
      if (error.code === 'ENOENT') return fallback;
      throw error;
    }
  }

  async writeJson(filePath, data) {
    await fs.writeFile(filePath, JSON.stringify(data, null, 2), 'utf8');
  }

  makeInitials(data) {
    return {
      lastname: String(data.lastname).trim(),
      firstnameLetter: String(data.firstname).trim().charAt(0).toUpperCase(),
      surnameLetter: String(data.surname).trim().charAt(0).toUpperCase()
    };
  }

  makeProjectStatus(data) {
    const normalized = String(data.project ?? '').toLowerCase();
    const isParticipant = normalized === 'true' || normalized === '1' || normalized === 'yes' || normalized === 'on';
    return {
      ...this.makeInitials(data),
      projectParticipant: isParticipant ? 'Участвует' : 'Не участвует'
    };
  }

  async saveTask1(data) {
    const rows = await this.readJson(task1Path, []);
    const nextId = rows.length > 0 ? Math.max(...rows.map(item => item.id)) + 1 : 1;
    const record = {
      id: nextId,
      lastname: String(data.lastname).trim(),
      firstname: String(data.firstname).trim(),
      surname: String(data.surname).trim(),
      gender: String(data.gender).trim(),
      faculty: String(data.faculty).trim(),
      project: String(data.project ?? '').toLowerCase() === 'true' || String(data.project ?? '').toLowerCase() === 'on',
      projectName: String(data.projectName ?? '').trim()
    };
    rows.push(record);
    await this.writeJson(task1Path, rows);
    return record;
  }

  async getTask1Records() {
    return await this.readJson(task1Path, []);
  }

  async getGroups() {
    return await this.readJson(task2GroupsPath, {});
  }

  async getStadiums() {
    return await this.readJson(task2StadiumPath, {});
  }

  async getResults() {
    return await this.readJson(task3ResultsPath, []);
  }
}

export default new Lab8Service();