package cli

import (
	"context"
	"errors"
	"io"

	openai "github.com/sashabaranov/go-openai"
)

func CreateChatCompletionRequest(messages []Message, maxTokens int) openai.ChatCompletionRequest {
	chatCompletionMessages := []openai.ChatCompletionMessage{}
	for _, m := range messages {
		chatCompletionMessages = append(chatCompletionMessages, openai.ChatCompletionMessage{
			Role:    m.Role,
			Content: m.OriginalContent,
		})
	}

	return openai.ChatCompletionRequest{
		Model:     openai.GPT3Dot5Turbo,
		Messages:  chatCompletionMessages,
		MaxTokens: maxTokens,
	}
}

// CreateChatCompletion submits a Chat Completion API request and returns the
// response.
func CreateChatCompletion(messages []Message, maxTokens int) (string, error) {
	client := openai.NewClient(config.OpenAI.APIKey)
	req := CreateChatCompletionRequest(messages, maxTokens)
	resp, err := client.CreateChatCompletion(context.Background(), req)
	if err != nil {
		return "", err
	}

	return resp.Choices[0].Message.Content, nil
}

// CreateChatCompletionStream submits a streaming Chat Completion API request
// and streams the response to the provided output channel.
func CreateChatCompletionStream(messages []Message, maxTokens int, output chan string) error {
	client := openai.NewClient(config.OpenAI.APIKey)
	req := CreateChatCompletionRequest(messages, maxTokens)

	defer close(output)

	stream, err := client.CreateChatCompletionStream(context.Background(), req)
	if err != nil {
		return err
	}

	defer stream.Close()

	for {
		response, err := stream.Recv()
		if errors.Is(err, io.EOF) {
			return nil
		}

		if err != nil {
			return err
		}
		output <- response.Choices[0].Delta.Content
	}
}