package com.example.managingtransactions;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;

@Component
class AppRunner implements CommandLineRunner {

  private final static Logger logger = LoggerFactory.getLogger(AppRunner.class);

  private final BookingService bookingService;

  public AppRunner(BookingService bookingService) {
    this.bookingService = bookingService;
  }

  @Override
  public void run(String... args) throws Exception {
    bookingService.book("Alice", "Bob", "Carol");
    Assert.isTrue(bookingService.findAllBookings().size() == 3,
        "First booking should work with no problem");
    logger.info("Alice, Bob and Carol have been booked");
    try {
      bookingService.book("Chris", "Samuel");
    } catch (RuntimeException e) {
      logger.info("v--- The following exception is expect because 'Samuel' is too " +
          "big for the DB ---v");
      logger.error(e.getMessage());
    }

    for (String person : bookingService.findAllBookings()) {
      logger.info("So far, " + person + " is booked.");
    }
    logger.info("You shouldn't see Chris or Samuel. Samuel violated DB constraints, " +
        "and Chris was rolled back in the same TX");
    Assert.isTrue(bookingService.findAllBookings().size() == 3,
        "'Samuel' should have triggered a rollback");

    try {
      bookingService.book("Buddy", null);
    } catch (RuntimeException e) {
      logger.info("v--- The following exception is expect because null is not " +
          "valid for the DB ---v");
      logger.error(e.getMessage());
    }

    for (String person : bookingService.findAllBookings()) {
      logger.info("So far, " + person + " is booked.");
    }
    logger.info("You shouldn't see Buddy or null. null violated DB constraints, and " +
        "Buddy was rolled back in the same TX");
    Assert.isTrue(bookingService.findAllBookings().size() == 3,
        "'null' should have triggered a rollback");
  }

}