import { _decorator, Component } from "cc";

export class ChatGPTService {
  private static _instance: ChatGPTService;

  public static getInstance() {
    if (!this._instance) {
      this._instance = new ChatGPTService();
    }
    return this._instance;
  }

  private apiurl: string = "https://cloud.fastgpt.cn/api/v1/chat/completions";
  private apikey: string =
    "fastgpt-gZSIl62Oznoqirj4zrs8tuvYH8Yk9C7GaOiOQtIh6UdLfup7QW2zSWS3";
  // 发送POST请求
  public async Post(data: GPTResquest): Promise<GPTResult> {
    const self = this;
    return new Promise(function (resolve, reject) {
      const xhr = new XMLHttpRequest();
      xhr.onreadystatechange = function () {
        if (xhr.readyState == 4 && xhr.status >= 200 && xhr.status < 400) {
          const response = xhr.responseText;
          if (response) {
            const d = JSON.parse(response);
            resolve(d);
          } else {
            resolve(null);
          }
        }
      };
      xhr.open("POST", self.apiurl, true);
      xhr.setRequestHeader("Content-Type", "application/json");
      xhr.setRequestHeader("Authorization", "Bearer " + self.apikey);
      xhr.send(JSON.stringify(data));
    });
  }
}

export type GPTResquest = {
  model: string; //gpt-3.5-turbo
  messages: { role: string; content: string }[];
  temperature: number;
};
export type GPTResult = {
  id: string;
  object: string;
  created: number;
  model: string;
  usage: {
    prompt_tokens: number;
    completion_tokens: number;
    total_tokens: number;
  };
  choices: {
    message: {
      role: string;
      content: string;
    };
    finish_reason: string;
    index: number;
  }[];
};