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package com.xlrit.gears.plugin.chatgpt;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import com.cjcrafter.openai.OpenAI;
import com.cjcrafter.openai.chat.ChatMessage;
import com.cjcrafter.openai.chat.ChatRequest;
import com.cjcrafter.openai.chat.ChatResponse;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.xlrit.gears.engine.task.TaskHandler;
import lombok.RequiredArgsConstructor;
import org.flowable.task.service.impl.persistence.entity.TaskEntity;
import org.jetbrains.annotations.VisibleForTesting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
@ConditionalOnExpression("${gears.chatgpt.enabled:true}")
@RequiredArgsConstructor
public class ChatGptTaskHandler implements TaskHandler {
    private static final Logger LOG = LoggerFactory.getLogger(ChatGptTaskHandler.class);

    private final ChatGptProperties properties;
    private final ObjectMapper objectMapper;

    @Override
    public boolean canHandle(String roleId, TaskEntity task) {
        return Objects.equals(roleId, properties.getRole());
    }

    @Override
    public TaskHandler.Action handle(String roleId, TaskEntity task, JsonNode form) {
        JsonNode basedOnJson = form.at("/values/__basedOn");
        LOG.info("basedOnJson={}", basedOnJson);
        ChatGptBasedOn basedOn = objectMapper.convertValue(basedOnJson, ChatGptBasedOn.class);
        LOG.info("basedOn={}", basedOn);

        String content = handle(basedOn);

        ObjectNode values = objectMapper.createObjectNode();
        values.put("content", content);
        return new SubmitAction(values);
    }

    @VisibleForTesting
    public String handle(ChatGptBasedOn basedOn) {
        OpenAI openai = OpenAI.builder()
            .apiKey(properties.getKey())
            .build();

        List messages = new ArrayList<>();
        messages.add(ChatMessage.toSystemMessage("Help the user with questions regarding " + basedOn.subject()));
        for (ChatMessage message : basedOn.history()) {
            if (message.getRole() != null && message.getContent() != null)
                messages.add(message);
        }

        // Here you can change the model's settings, add tools, and more.
        ChatRequest request = ChatRequest.builder()
                .model(properties.getModel())
                .messages(messages)
                .build();

        ChatResponse response = openai.createChatCompletion(request);
        return response.getChoices().isEmpty() ? "" : response.getChoices().get(0).getMessage().getContent();
    }
}