import fs from 'fs';
import path from 'path';

export default class History {
  constructor() {
    this.filePath = path.resolve('data', 'history.json');
    try {
      const data = fs.readFileSync(this.filePath);
      this.db = data.length === 0 ? [] : JSON.parse(data);
    } catch (e) {
      this.db = [];
    }
  }

  get(id) {
    return this.db.find(doc => parseInt(doc.id, 10) === parseInt(id, 10));
  }

  add(doc) {
    // prevent duplicate entries
    if (this.get(doc.id)) return;

    // add doc to history, truncate as needed
    this.db.push(doc);
    if (this.db.length > 1000) this.db.splice(0, 1000);

    // write the updated content to the file
    fs.writeFileSync(this.filePath, JSON.stringify(this.db), { encoding: 'utf8' });
  }
}