import { COMETAPI } from '../../globals';
import { parseJson } from '../../utils/parseJson';
import { OpenAIChatCompleteConfig } from '../openai/chatComplete';
import { ParameterConfig, ProviderConfig } from '../types';

const cometAPIModelConfig = OpenAIChatCompleteConfig.model as ParameterConfig;

export const CometAPIChatCompleteConfig: ProviderConfig = {
  ...OpenAIChatCompleteConfig,
  model: {
    ...cometAPIModelConfig,
    default: 'gpt-3.5-turbo',
  },
};

interface CometAPIStreamChunk {
  id: string;
  object: string;
  created: number;
  model: string;
  choices: {
    delta?: Record<string, unknown>;
    message?: Record<string, unknown>;
    index: number;
    finish_reason: string | null;
    logprobs?: unknown;
  }[];
  usage?: Record<string, unknown>;
  system_fingerprint?: string | null;
}

export const CometAPIChatCompleteStreamChunkTransform: (responseChunk: string) => string = (
  responseChunk,
) => {
  let chunk = responseChunk.trim();

  if (!chunk) {
    return '';
  }

  if (chunk.startsWith('data:')) {
    chunk = chunk.slice(5).trim();
  }

  if (!chunk) {
    return '';
  }

  if (chunk === '[DONE]') {
    return `data: ${chunk}\n\n`;
  }

  try {
    const parsedChunk: CometAPIStreamChunk = parseJson(chunk);

    if (!parsedChunk?.choices?.length) {
      return `data: ${chunk}\n\n`;
    }

    return (
      `data: ${JSON.stringify({
        ...parsedChunk,
        provider: COMETAPI,
      })}` + '\n\n'
    );
  } catch (error) {
    const globalConsole = (globalThis as Record<string, any>).console;
    if (typeof globalConsole?.error === 'function') {
      globalConsole.error('Error parsing CometAPI stream chunk:', error);
    }
    return `data: ${chunk}\n\n`;
  }
};