import { Score } from '../../db/models'
import { ScoreData } from '../../db/models/Score'
import { sleep } from '../../utils'
import difyService, {
  CompletionMessagesPayload,
  DifyRateLimitExceedError,
} from '../difyService'
import {
  makePaginate,
  PaginateOptions,
  PaginationConnection,
} from 'sequelize-cursor-pagination'

async function getCompletionMessages(
  payload: CompletionMessagesPayload
): Promise<Score> {
  const { query, onUpdate, signature } = payload
  const scoreId = Score.getScoreId(query)
  const exist = await Score.findOne({ where: { scoreId } })

  if (exist) {
    const { messageId } = exist

    const words = exist.answer.split(' ').map((word) => ` ${word}`)
    if (words[0]) {
      words[0] = words[0].trim()
    }

    for (const word of words) {
      const data = { event: 'message', messageId, signature, answer: word }

      const message = JSON.stringify(data)

      onUpdate(`data: ${message}\n\n`)
      await sleep(20)
    }

    const data = { event: 'message_end', messageId, signature }

    const message = JSON.stringify(data)

    onUpdate(`data: ${message}\n\n`)

    return exist
  }

  try {
    const { answer, messageId } =
      await difyService.getCompletionMessagesByFetchAPI(payload)

    const [scoreText, score] = Score.getScore(answer)
    const [row] = await Score.findOrCreate({
      where: { scoreId },
      defaults: {
        signature,
        scoreId,
        query,
        answer,
        messageId,
        score,
        scoreText,
      },
    })
    return row
  } catch (e) {
    if (e instanceof DifyRateLimitExceedError) {
      const { serveAt } = e

      const intime = Math.ceil((serveAt - Date.now()) / 1000)

      throw new Error(
        `Master is talking with other guys, please try after ${intime}s.`
      )
    }
    throw e
  }
}

// console.log(Tweet.rawAttributes)
let paginate: (
  this: unknown,
  queryOptions: PaginateOptions<Score>
) => Promise<PaginationConnection<Score>>

async function paginateScoreByOrder(
  after?: string,
  limit = 10
): Promise<PaginationConnection<ScoreData>> {
  if (!paginate) {
    paginate = makePaginate(Score)
  }

  const secondResult = await paginate({
    order: [['id', 'DESC']],
    limit,
    after,
  })

  const ret: PaginationConnection<ScoreData> = {
    ...secondResult,
    edges: secondResult.edges.map((edge) => ({
      cursor: edge.node.id,
      node: edge.node.getData(),
    })),
  }

  return ret
}

async function getScoreById(id: number): Promise<Score> {
  const row = await Score.findByPk(id)

  if (!row) {
    throw new Error('Score not found')
  }

  return row
}

const scoreService = {
  getCompletionMessages,
  paginateScoreByOrder,
  getScoreById,
}

export default scoreService