import { randomUUID } from "crypto";

import Logs from "./logs.js";

/**
 * 解析推送过来的消息
 * @param {*} data
 * @returns {object}
 */
const parseMessage = (data) => {
  let message;
  try {
    message = JSON.parse(data);
  }
  catch(e) {
    message = { text: data };
  }
  return message;
}

class WebSocketClient {
  #wsClient;
  constructor(wsClient) {
    this.#wsClient = wsClient;
  }
  on(type, callback) {
    if (type == 'message') {
      this.#wsClient.on('message', (event) => {
        const data = parseMessage(event.data);
        callback(data);
      });
    }
    else {
      this.#wsClient.on(type, callback);
    }
  }
  send(message) {
    this.#wsClient.send(JSON.stringify(message));
  }
  close() {
    this.#wsClient.close();
  }
}

class WsClientData {
  #wsClient;
  #name;
  #request = {
    callbacks: {},
    functions: {}
  };
  #response = {
    functions: {}
  };

  constructor(wsClient, name='wsClient') {
    this.#wsClient = wsClient.constructor.name === 'WebSocket' ? new WebSocketClient(wsClient) : wsClient;
    this.#name = name;
    this.#wsClient.on('message', (message) => {
      this.#handleMessage(message);
    });
    this.#wsClient.on('error', (error) => {
      Logs.err('wsClient error', error);
    });
    this.#wsClient.on('close', () => {
      Logs.outDev('wsClient closed');
    });
  }

  get(type, params) {
    return new Promise((resolve, reject) => {
      const id = randomUUID();
      try {
        this.#wsClient.send({ method: 'get', type, id, params });
        this.#request.callbacks[id] = resolve;
      }
      catch (error) {
        delete this.#request.callbacks[id];
        reject(error);
      }
    });
  }

  registerResponse(type, func) {
    this.#response.functions[type] = func;
  }

  #responseData(type, params, id) {
    const func = this.#response.functions[type];
    func?.(params).then(data => {
      this.#wsClient.send({ type: 'response', data, id });
    });
  }

  post(type, data) {
    this.#wsClient.send({ method: 'post', type, data });
  }

  registerRequest(type, func) {
    this.#request.functions[type] = func;
  }

  #requestData(type, data) {
    const func = this.#request.functions[type];
    func?.(data);
  }

  #handleMessage(message) {
    const { callbacks } = this.#request;
    const { method, type, data, error, id, params } = message;
    if (error) {
      console.error(error);
    }
    if (method == 'get' && id) {
      this.#responseData(type, params, id);
    }
    else if (type == 'response' && id && callbacks[id]) {
      callbacks[id](data);
      delete callbacks[id];
    }
    else if (method == 'post' && type) {
      this.#requestData(type, data);
    }
  }
}

export default WsClientData;