import { Config } from './config.js'
import fetch from 'node-fetch'
import { v4 as uuidv4 } from 'uuid'
async function getKeyv () {
  let Keyv
  try {
    Keyv = (await import('keyv')).default
  } catch (error) {
    throw new Error('keyv依赖未安装，请使用pnpm install keyv安装')
  }
  return Keyv
}

export default class ChatGLMClient {
  constructor (opts) {
    // user: qq号
    this.opts = opts
  }

  async initCache () {
    if (!this.conversationsCache) {
      const cacheOptions = this.opts.cache || {}
      cacheOptions.namespace = cacheOptions.namespace || 'chatglm'
      let Keyv = await getKeyv()
      this.conversationsCache = new Keyv(cacheOptions)
    }
  }

  async sendMessage (prompt, opts) {
    const {
      conversationId = uuidv4(),
      messageId = uuidv4(),
      parentMessageId,
      temperature = Config.temperature
    } = opts
    await this.initCache()
    let url = Config.chatglmBaseUrl + '/api/chat'
    if (Config.debug) {
      logger.info('use chatglm api server endpoint: ' + url)
    }
    const conversationKey = `ChatGLMUser_${this.opts.user}`
    const conversation = (await this.conversationsCache.get(conversationKey)) || {
      messages: [],
      createdAt: Date.now()
    }
    let history = getMessagesForConversation(conversation.messages, parentMessageId)
    if (Config.debug) {
      logger.info(history)
    }
    console.log(history)
    let option = {
      method: 'POST',
      body: JSON.stringify({
        prompt,
        temperature,
        history
      }),
      headers: {
        'content-type': 'application/json',
        library: 'chatgpt-plugin'
      }
    }
    let response = await fetch(url, option)
    let result = await response.text()
    try {
      result = JSON.parse(result)
      conversation.messages.push({
        id: messageId,
        role: 'user',
        content: prompt,
        parentMessageId
      })
      let responseId = uuidv4()
      conversation.messages.push({
        id: responseId,
        role: 'AI',
        content: result.data,
        parentMessageId: messageId
      })
      await this.conversationsCache.set(conversationKey, conversation)
      return {
        conversationId,
        id: responseId,
        text: result.data
      }
    } catch (e) {
      console.error(result)
      throw new Error(result)
    }
  }
}

function getMessagesForConversation (messages, parentMessageId) {
  const orderedMessages = []
  let currentMessageId = parentMessageId
  while (currentMessageId) {
    const message = messages.find((m) => m.id === currentMessageId)
    if (!message) {
      break
    }
    orderedMessages.unshift(message)
    currentMessageId = message.parentMessageId
  }

  return orderedMessages
}