03. Christmas Dinner-Exam - 10 December 2019

class ChristmasDinner {
  constructor(budget) {
    this.budget = budget;
    this.dishes = [];
    this.products = [];
    this.guests = {};
  }

  get budget() {
    return this._budget;
  }

  set budget(value) {
    if (typeof value !== 'number' || value < 0) {
      throw new TypeError('The budget cannot be a negative number');
    }

    this._budget = value;
  }

  shopping(product) {
    const type = product[0];
    const price = +product[1];

    if (price > this.budget) {
      throw new Error('Not enough money to buy this product');
    }

    if (!this.products.includes(type)) {
      this.products.push(type);
    }

    this.budget -= price;

    return `You have successfully bought ${type}!`;
  }

  recipes(recipe) {
    const { recipeName } = recipe;
    const { productsList } = recipe;

    if (productsList.length < 1) {
      return;
    }

    for (const product of productsList) {
      if (!this.products.includes(product)) {
        throw new Error('We do not have this product');
      }
    }

    this.dishes.push({ recipeName, productsList });

    return `${recipeName} has been successfully cooked!`;
  }

  inviteGuests(name, dish) {
    if (!this.dishes.map((d) => d.recipeName).includes(dish)) {
      throw new Error('We do not have this dish');
    }

    if (this.guests[name]) {
      throw new Error('This guest has already been invited');
    }

    this.guests[name] = dish;

    return `You have successfully invited ${name}!`;
  }

  showAttendance() {
    let result = '';
    const guestsNames = Object.keys(this.guests);

    guestsNames.forEach((name) => {
      const dish = this.dishes.filter((d) => d.recipeName === this.guests[name]);
      result += `${name} will eat ${this.guests[name]}, which consists of ${dish[0].productsList.join(', ')}\n`;
    });

    return result.trim();
  }
}