import HttpClient from 'sosise-core/build/HttpClient/HttpClient';
import HttpClientRetryConfig from 'sosise-core/build/Types/HttpClientRetryConfig';
import ChatMessageType from '../../Types/LLM/ChatMessageType';
import CompletionResponseType from '../../Types/LLM/CompletionResponseType';
import LLMRepositoryInterface from './LLMRepositoryInterface';

/**
 * OpenAI Completion Repository
 * Handles communication with OpenAI API for chat completions
 */
export default class OpenAICompletionRepository implements LLMRepositoryInterface {
    private static readonly BASE_URL = process.env.OPENAI_BASE_URL || 'https://api.openai.com';
    private static readonly API_KEY = process.env.OPENAI_API_KEY || '';
    private httpClient: HttpClient;
    private retryConfig: HttpClientRetryConfig = {
        requestMaxRetries: 3,
        requestRetryInterval: 2000,
        requestRetryStrategy: 'linear',
        requestDoNotRetryForHttpCodes: [400, 401, 403],
    };

    /**
     * Constructor
     */
    constructor() {
        // Instantiate http client
        this.httpClient = new HttpClient({
            baseURL: OpenAICompletionRepository.BASE_URL,
            headers: {
                Accept: 'application/json',
                'Content-Type': 'application/json',
                Authorization: `Bearer ${OpenAICompletionRepository.API_KEY}`,
            },
            timeout: 600000,
        });
    }

    /**
     * Get completion from OpenAI
     * @param messages - Array of chat messages
     * @param model - Model name to use
     * @param temperature - Optional temperature parameter
     * @returns Promise resolving to the completion response
     */
    public async getCompletion(messages: ChatMessageType[], model: string, temperature?: number): Promise<CompletionResponseType> {
        // Prepare data
        const data: any = {
            model,
            messages,
        };

        // Set temperature if provided
        if (temperature !== undefined) {
            data.temperature = temperature;
        }

        // Make request with retry
        const response = await this.httpClient.requestWithRetry({ url: '/v1/chat/completions', method: 'POST', data }, this.retryConfig);

        // Return structured response
        return {
            responseText: response.data.choices[0].message.content,
            usedTokens: {
                input: response.data.usage.prompt_tokens - (response.data.usage.prompt_tokens_details?.cached_tokens ?? 0),
                cachedInput: response.data.usage.prompt_tokens_details?.cached_tokens ?? 0,
                output: response.data.usage.completion_tokens,
            },
        };
    }
}