FreelanceBot

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package telegramBot.command;
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import org.telegram.telegrambots.meta.api.objects.Update;
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import telegramBot.entity.Subscription;
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import telegramBot.service.MessageService;
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import telegramBot.service.UserService;
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import java.util.Comparator;
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import java.util.List;
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public class SubscriptionCommand implements Command {
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    private static final String[] SUBSCRIPTION_COMMANDS = {
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            "Ваши текущие подписки: ", "У Вас нет подписок"
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    };
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    private final MessageService messageService;
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    private UserService userService;
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    public SubscriptionCommand(MessageService service){
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        this.messageService = service;
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    }
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    public SubscriptionCommand setUserService(UserService userService) {
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        this.userService = userService;
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        return this;
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    }
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    @Override
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    public void execute(Update update) {
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        String chatId = update.getMessage().getChatId().toString();
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        List<Subscription> subscriptions = this.userService.
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                getByChatId(chatId).getSubscriptions();
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        String command = null;
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        if(!subscriptions.isEmpty()){
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            subscriptions.sort(Comparator.comparingInt(s -> s.getLanguage().length()));
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            StringBuilder subs = new StringBuilder();
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            for(int i = 0; i < subscriptions.size(); i ++){
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                if(i < subscriptions.size() - 1){
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                    subs.append(subscriptions.get(i).getLanguage()).append(", ");
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                }
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                else subs.append(subscriptions.get(i).getLanguage());
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            }
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            command = String.format("%s %s", SUBSCRIPTION_COMMANDS[0], subs.toString());
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        }
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        else {
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            command = SUBSCRIPTION_COMMANDS[1];
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        }
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        messageService.sendResponse(chatId, command);
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    }
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}
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