02. Press House Exam may 2020

function pressHouse() {
  class Article {
    constructor(title, content) {
      this.title = title;
      this._content = content;
    }

    toString() {
      return `Title: ${this.title}` + '\n' + `Content: ${this._content}`;
    }
  }
  class ShortReports extends Article {
    constructor(title, content, originalResearch) {
      if (content.length > 150) {
        throw new Error('Short reports content should be less then 150 symbols.');
      }
      if (!originalResearch.author || !originalResearch.title) {
        throw new Error('The original research should have author and title.');
      }
      super(title, content);
      this.originalResearches = originalResearch,
      this.comments = [];
    }


    addComment(comment) {
      this.comments.push(comment);
      return 'The comment is added.';
    }

    toString() {
      if (this.comments.length != 0) {
        this.comments.unshift('\n' + 'Comments:');
      }
      return `${`${super.toString()}` + '\n'}${`Original Research: ${this.originalResearches.title} by
         ${this.originalResearches.author}`.trim()}${'\n'.trim()}${this.comments.join('\n')}`;
    }
  }
  class BookReview extends Article {
    constructor(title, content, book) {
      super(title, content);
      this.book = {
        name: book.name,
        author: book.author,
      };
      this.clients = [];
    }

    addClient(clientName, orderDescription) {
      let client = {};
      if (this.clients.find(((c) => c.clientName == clientName) && ((c) => c.orderDescription == orderDescription))) {
        throw new Error('This client has already ordered this review.');
      } else {
        this.clients.push(client = { clientName, orderDescription });
        return `${clientName} has ordered a review for ${this.book.name}`;
      }
    }

    toString() {
      let printOrders = '';
      if (this.clients.length != 0) {
        printOrders += 'Orders:' + '\n';
      }
      for (let i = 0; i < this.clients.length; i++) {
        printOrders += `${this.clients[i].clientName} - ${this.clients[i].orderDescription}` + '\n';
      }
      return `${`${super.toString()}` + '\n' + `Book: ${this.book.name}`}${'\n'.trim()}${`${printOrders}`.trim()}`;

    }
  }
  return {
    Article,
    ShortReports,
    BookReview,
  };
}