SecretSanta

SecretSantaSelection.java

public class SecretSantaSelection {

    private final long phoneNumber;
    private final String message;

    public SecretSantaSelection(final long phoneNumber, final String message) {
        this.phoneNumber = phoneNumber;
        this.message = message;
    }

    public long getPhoneNumber() {
        return phoneNumber;
    }

    public String getMessage() {
        return message;
    }
}

SecretSantaUtil.java

public static List<SecretSantaSelection> generateSecretSantaList() {

        final List<String> allFolks = Arrays.asList("phil", "melissa", "lacey", "meredith");

        final Map<String, Boolean> people = new HashMap<>();
        people.put("phil", false);
        people.put("melissa", false);
        people.put("lacey", false);
        people.put("meredith", false);

        final Map<String, Long> phoneNumbers = new HashMap<>();
        phoneNumbers.put("phil", 7137037691L);
        phoneNumbers.put("melissa", 4128418334L);
        phoneNumbers.put("meredith", 6177946733L);
        phoneNumbers.put("lacey", 4088230751L);

        final Set<String> secretSantaSelections = new HashSet<>();
        final Map<String, String> selections = new HashMap<>();

        boolean filled = false;

        while (!filled) {

            final Optional<String> nextSelection = people.entrySet().parallelStream()
                    .filter(entry -> !people.get(entry.getKey())) // ensure this person hasn't received a secret santa yet
                    .map(Map.Entry::getKey)
                    .findAny();

            if (nextSelection.isPresent()) {
                final String selection = nextSelection.get();

                boolean foundSelection = false;
                while (!foundSelection) {
                    Collections.shuffle(allFolks);

                    final Optional<String> secretSantaSelection = allFolks.stream()
                            .filter(secretSanta -> !secretSanta.equals(selection))
                            .filter(secretSanta -> !secretSantaSelections.contains(secretSanta))
                            //.filter(secretSanta -> !couples.get(selection).equals(secretSanta))
                            .findAny();

                    if (secretSantaSelection.isPresent()) {
                        secretSantaSelections.add(secretSantaSelection.get()); // selected a match
                        selections.put(selection, secretSantaSelection.get());
                        people.put(selection, true);
                        foundSelection = true;
                    }
                }
            } else {
                filled = true;
            }
        }

        final Map<String, String> couplesNames = new HashMap<>();
        couplesNames.put("phil", "Roxanne and Phil");
        couplesNames.put("melissa", "Matt and Melissa");
        couplesNames.put("lacey", "Scott and Lacey");
        couplesNames.put("meredith", "Meredith");

        final String secretSantaMessage = "Dear %s. Your secret santa selection for this christmas is %s. The total budget is $100";

        return selections.entrySet().stream().map(entry -> {
            final String coupleSending = couplesNames.get(entry.getKey());
            final String coupleReceiving = couplesNames.get(entry.getValue());
            final String message = String.format(secretSantaMessage, coupleSending, coupleReceiving);
            final long phoneNumber = phoneNumbers.get(entry.getKey());
            return new SecretSantaSelection(phoneNumber, message);
        }).collect(Collectors.toList());
    }

SecretSantaWebUtil.java

@GET
    @Timed
    @Path("/sms/test")
    @Produces(MediaType.APPLICATION_JSON)
    public Response runSecretSanta(final @QueryParam("to") String toNumber, final @QueryParam("message") String message) {
        final String to = "+1" + toNumber;
        final String from = "+14087676479";
        final Message sms = Message
                .creator(new PhoneNumber(to), new PhoneNumber(from), message)
                .setMediaUrl("https://farm8.staticflickr.com/7402/11570925325_fdbe0b3f78_z_d.jpg")
                .create();
        logger.info("smsSent: sid={}", sms.getSid());
        return Response.ok().entity("{\"id\": " + sms.getSid() + "}").build();
    }

    @GET
    @Timed
    @Path("/secretsanta")
    @Produces(MediaType.APPLICATION_JSON)
    public Response secretSanta() {
        final List<SecretSantaSelection> selections = generateSecretSantaList();
        selections.forEach(selection -> runSecretSanta(String.valueOf(selection.getPhoneNumber()), selection.getMessage()));
        return Response.ok().entity("{\"status\": \"complete\"}").build();
    }