05. Breakfast Robot

function solution() {
  const stock = {
    protein: 0,
    carbohydrate: 0,
    fat: 0,
    flavour: 0,
  };

  const receipts = {
    apple: {
      carbohydrate: 1,
      flavour: 2,
    },
    lemonade: {
      carbohydrate: 10,
      flavour: 20,
    },
    burger: {
      carbohydrate: 5,
      fat: 7,
      flavour: 3,
    },
    eggs: {
      protein: 5,
      fat: 1,
      flavour: 1,
    },
    turkey: {
      protein: 10,
      carbohydrate: 10,
      fat: 10,
      flavour: 10,
    },
  };

  function report() {
    const result = Object.keys(stock).reduce((acc, element) => {
      acc.push(`${element}=${stock[element]}`);
      return acc;
    }, []);

    return result.join(' ');
  }

  function restock(args) {
    const [, product, qtty] = args;
    stock[product] += +qtty;
    return 'Success';
  }

  function prepare(args) {
    const [, food, qtty] = args;
    let canPrepare = true;
    const currentReceipt = Object.entries(receipts[food]);

    for (const element of currentReceipt) {
      const [ingredient, qt] = element;

      if (stock[ingredient] < +qt * +qtty) {
        canPrepare = false;
        return `Error: not enough ${ingredient} in stock`;
      }
    }

    if (canPrepare) {
      currentReceipt.forEach((element) => {
        const [ingredient, qt] = element;

        stock[ingredient] -= +qt * +qtty;
      });

      return 'Success';
    }
  }

  function finalResult(input) {
    const args = input.split(' ');

    if (args[0] === 'report') {
      return report();
    }
    if (args[0] === 'restock') {
      return restock(args);
    }
    if (args[0] === 'prepare') {
      return prepare(args);
    }
  }

  return finalResult;
}