/*
 * Copyright 2023-2024 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.springframework.ai.chat.model;

import java.util.Objects;

import org.springframework.ai.chat.messages.AssistantMessage;
import org.springframework.ai.chat.metadata.ChatGenerationMetadata;
import org.springframework.ai.model.ModelResult;

/**
 * Represents a response returned by the AI.
 */
public class Generation implements ModelResult<AssistantMessage> {

	private final AssistantMessage assistantMessage;

	private ChatGenerationMetadata chatGenerationMetadata;

	public Generation(AssistantMessage assistantMessage) {
		this(assistantMessage, ChatGenerationMetadata.NULL);
	}

	public Generation(AssistantMessage assistantMessage, ChatGenerationMetadata chatGenerationMetadata) {
		this.assistantMessage = assistantMessage;
		this.chatGenerationMetadata = chatGenerationMetadata;
	}

	@Override
	public AssistantMessage getOutput() {
		return this.assistantMessage;
	}

	@Override
	public ChatGenerationMetadata getMetadata() {
		ChatGenerationMetadata chatGenerationMetadata = this.chatGenerationMetadata;
		return chatGenerationMetadata != null ? chatGenerationMetadata : ChatGenerationMetadata.NULL;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (!(o instanceof Generation that)) {
			return false;
		}
		return Objects.equals(this.assistantMessage, that.assistantMessage)
				&& Objects.equals(this.chatGenerationMetadata, that.chatGenerationMetadata);
	}

	@Override
	public int hashCode() {
		return Objects.hash(this.assistantMessage, this.chatGenerationMetadata);
	}

	@Override
	public String toString() {
		return "Generation[" + "assistantMessage=" + this.assistantMessage + ", chatGenerationMetadata="
				+ this.chatGenerationMetadata + ']';
	}

}
