001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2025-2026 The Enola <https://enola.dev> Authors
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *     https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package dev.enola.audio.voice.twilio.relay;
019
020import dev.enola.audio.voice.twilio.relay.ConversationRelayRequest.DTMF;
021import dev.enola.audio.voice.twilio.relay.ConversationRelayRequest.Error;
022import dev.enola.audio.voice.twilio.relay.ConversationRelayRequest.Interrupt;
023import dev.enola.audio.voice.twilio.relay.ConversationRelayRequest.Prompt;
024import dev.enola.audio.voice.twilio.relay.ConversationRelayRequest.Setup;
025
026import org.jspecify.annotations.Nullable;
027import org.slf4j.Logger;
028import org.slf4j.LoggerFactory;
029
030public interface ConversationHandler {
031
032    static final Logger logger = LoggerFactory.getLogger(ConversationHandler.class);
033
034    default @Nullable ConversationRelayResponse onSetup(Setup setup) {
035        return null;
036    }
037
038    default @Nullable ConversationRelayResponse onPrompt(Prompt prompt) {
039        return null;
040    }
041
042    default @Nullable ConversationRelayResponse onDTMF(DTMF dtmf) {
043        return null;
044    }
045
046    default @Nullable ConversationRelayResponse onInterrupt(Interrupt interrupt) {
047        return null;
048    }
049
050    default @Nullable ConversationRelayResponse onError(Error error) {
051        logger.error("Error: {}", error.description());
052        return null;
053    }
054}