/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.agents.api.event;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.flink.agents.api.Event;
import org.apache.flink.agents.api.chat.messages.ChatMessage;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

public class ChatResponseEvent extends Event {

    public static final String EVENT_TYPE = "_chat_response_event";

    private static final ObjectMapper MAPPER = new ObjectMapper();

    public ChatResponseEvent(UUID requestId, ChatMessage response) {
        this(requestId, response, 0, 0);
    }

    public ChatResponseEvent(
            UUID requestId, ChatMessage response, int retryCount, int totalRetryWaitSec) {
        super(EVENT_TYPE);
        setAttr("request_id", requestId);
        setAttr("response", response);
        setAttr("retry_count", retryCount);
        setAttr("total_retry_wait_sec", totalRetryWaitSec);
    }

    @JsonCreator
    public ChatResponseEvent(
            @JsonProperty("id") UUID id,
            @JsonProperty("attributes") Map<String, Object> attributes) {
        super(id, EVENT_TYPE, normalizeAttributes(attributes));
    }

    /** Converts nested attributes back to their typed forms. */
    private static Map<String, Object> normalizeAttributes(Map<String, Object> attributes) {
        Object rawId = attributes.get("request_id");
        if (rawId instanceof String) {
            attributes.put("request_id", UUID.fromString((String) rawId));
        }
        Object rawResponse = attributes.get("response");
        if (rawResponse instanceof Map) {
            attributes.put("response", MAPPER.convertValue(rawResponse, ChatMessage.class));
        }
        return attributes;
    }

    /**
     * Reconstructs a typed ChatResponseEvent from a base Event, deserializing nested types.
     *
     * @param event the base event containing chat response data in attributes
     * @return a typed ChatResponseEvent
     */
    public static ChatResponseEvent fromEvent(Event event) {
        ChatResponseEvent result =
                new ChatResponseEvent(event.getId(), new HashMap<>(event.getAttributes()));
        if (event.hasSourceTimestamp()) {
            result.setSourceTimestamp(event.getSourceTimestamp());
        }
        return result;
    }

    @JsonIgnore
    public UUID getRequestId() {
        Object val = getAttr("request_id");
        if (val instanceof String) {
            return UUID.fromString((String) val);
        }
        return (UUID) val;
    }

    @JsonIgnore
    public ChatMessage getResponse() {
        return (ChatMessage) getAttr("response");
    }

    @JsonIgnore
    public int getRetryCount() {
        return ((Number) getAttr("retry_count")).intValue();
    }

    @JsonIgnore
    public int getTotalRetryWaitSec() {
        return ((Number) getAttr("total_retry_wait_sec")).intValue();
    }
}
