DogHouse.java

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class DogHouse {
  public List<Dog> dogs = new ArrayList<>();

  public String deposit(String userName, Dog dog) {
    String validationMessage = "";

    if (dog.getAge() < 1) {
      validationMessage = "The dog its to small to be deposit. Come back when the dog were older than 1 year.";
    } else if (dog.getAge() > 30) {
      validationMessage = "WTF this not suppouse to be alive???. I will call the Zoo";
    } else if (dog.getAge() > 10) {
      validationMessage = "The dog its to older to be deposit. Dont come back.";
    } else if (dog.getName().contains("People eater")) {
      validationMessage = "The dog its to danguerous to be deposit. Dont come back.";
    } else if (this.dogs.size() >= 100) {
      validationMessage = "We are full :(. Why dont you adopt one";
    } else {
      //All ok! the dog its fine
    }

    if (!validationMessage.equals("")) {
      //something went wrong with this dog
      return validationMessage;
    }

    double price = this.calculate(dog);
    this.setIdToDog(dog);

    //Put the dog into its cage
    this.dogs.add(dog);

    String ticket = "------------------------------------------------------------------------------------" + "\n";
    ticket += String.format("Dear %s this is the ticket conforming you are Depositing a dog to us.", userName) + "\n";
    ticket += String.format("The dog its %s", dog.desc()) + "\n";
    ticket += String.format("You must pay: %f on the cash register", price) + "\n";
    ticket += "------------------------------------------------------------------------------------" + "\n";

    return ticket;
  }

  public String adopt(String userName, DogBreed raceEnum) {
    String validationMessage = "";

    if (null == dogs.stream().filter(d -> d.getBreed().equals(raceEnum)).findFirst().orElse(null))
    {
      validationMessage = "We dont have the dog you want";
    }
    else if (userName.contains("Dog killer")) {
      validationMessage = "I will call Police";
    }

    if (!validationMessage.equals("")) {
      //something went wrong with this dog
      return validationMessage;
    }

    Dog dog = dogs.stream().filter(d -> d.getBreed().equals(raceEnum)).findFirst().orElse(null);

    double price = this.calculate2(dog);

    String ticket = "------------------------------------------------------------------------------------" + "\n";
    ticket += String.format("Dear %s this is the ticket conforming you are Adopting a dog to us.", userName) + "\n";
    ticket += String.format("The dog its %s", dog.desc()) + "\n";
    ticket += String.format("You must pay: %f on the cash register", price) + "\n";
    ticket += "------------------------------------------------------------------------------------" + "\n";

    return ticket;
  }

  //calculate the cost of deposit a Dog
  private double calculate(Dog dog) {
    double depositPriceDouble;

    switch (dog.getBreed()) {
      //Big dogs are expensive to mantain
      case Boxer:
      case Bulldog:
      case Rotweiler:
      case GermanShepherd:
        double bigDogPrice = (10 * dog.getAge()) * 2.0; //2.0 its the IVA
        depositPriceDouble = bigDogPrice;
        break;
      case Chihuahua:
        double smallDogPrice = (10 * dog.getAge()) * 2.0;
        depositPriceDouble = smallDogPrice;
        break;
      default:
        double normalDogPrice = (10 * dog.getAge()) * 2.0;
        depositPriceDouble = normalDogPrice;
        break;
    }

    //return the price
    return depositPriceDouble;
  }

  //calculate the cost of adopt a Dog
  private double calculate2(Dog dog) {
    double depositPriceDouble;

    switch (dog.getBreed()) {
      //Its ugly and noisy its free
      case Chihuahua:
        depositPriceDouble = 0;
        break;
      default:
        double normalDogPrice = dog.howLongInDogHouse() * 2.0; //2.0 its the IVA
        depositPriceDouble = normalDogPrice;
        break;
    }

    //return the price
    return depositPriceDouble;
  }

  private void setIdToDog(Dog dog) {
    dog.setDogHouseId(randomString());
    //if we are setting Id its because we are going to deposit so we set flag to true.
    dog.setInDogHouse(true);
    dog.setDepositAt(LocalDate.now());

    //this.renameDog(dog);
  }

  private void renameDog(Dog dog) {
    dog.setName(dog.getName() + " is on deposit now :(") ;
  }

  private String randomString() {
    int leftLimit = 48; // numeral '0'
    int rightLimit = 122; // letter 'z'
    int targetStringLength = 10;
    Random random = new Random();

    return random.ints(leftLimit, rightLimit + 1)
      .filter(i -> (i <= 57 || i >= 65) && (i <= 90 || i >= 97))
      .limit(targetStringLength)
      .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
      .toString();
  }
}