import { isMainThread, parentPort, workerData } from 'worker_threads'
import { QuestionDb } from '../types/basicTypes'
import { SearchResultQuestion, countOfQdbs } from '../utils/qdbUtils'
import logger from '../utils/logger'
import { TaskObject } from './workerPool'
import { tesseractLoaded } from '../utils/tesseract'
import { handleSearch } from './handlers/handleSearch'
import { handleMerge } from './handlers/handleMerge'
import { handleDbEdit } from './handlers/handleDbEdit'
import { handleNewQuestions } from './handlers/handleNewQuestion'
import { handleNewDb } from './handlers/handleNewDb'
import { handleDbClean } from './handlers/handleDbClean'
import { handleQuestionsToPeers } from './handlers/handleQuestionsToPeers'
import { handleRmQuestions } from './handlers/handleRmQuestions'
import { handleUsersToPeers } from './handlers/handleUsersToPeers'
import { handleUserFilesToPeers } from './handlers/handleUserFilesToPeers'

export interface WorkerResult {
    msg: string
    workerIndex: number
    result?: SearchResultQuestion[] | number[][]
    error?: boolean
}

if (!isMainThread) {
    handleWorkerData()
}

async function handleWorkerData() {
    const {
        workerIndex,
        initData,
    }: { workerIndex: number; initData: Array<QuestionDb> } = workerData
    let qdbs: Array<QuestionDb> = initData
    const setQdbs = (newVal: Array<QuestionDb>) => {
        qdbs = newVal
    }

    const qdbCount = initData.length
    const { subjCount, questionCount } = countOfQdbs(initData)

    logger.Log(
        `[THREAD #${workerIndex}]: Worker ${workerIndex} reporting for duty! qdbs: ${qdbCount}, subjects: ${subjCount.toLocaleString()}, questions: ${questionCount.toLocaleString()}`
    )

    parentPort.on('message', async (msg: TaskObject) => {
        try {
            await tesseractLoaded

            await handleMessage(qdbs, msg, workerIndex, setQdbs)
        } catch (e) {
            console.error(e)
            parentPort.postMessage({
                msg: `From thread #${workerIndex}: unhandled error occured! (${
                    (msg as any)?.type
                })`,
                workerIndex: workerIndex,
                e: e,
            })
        }
    })
}

function handleMessage(
    qdbs: QuestionDb[],
    msg: TaskObject,
    workerIndex: number,
    setQdbs: (newVal: QuestionDb[]) => void
) {
    switch (msg.type) {
        case 'search':
            return handleSearch(qdbs, msg, workerIndex)
        case 'merge':
            return handleMerge(qdbs, msg, workerIndex)
        case 'dbEdit':
            return handleDbEdit(qdbs, msg, workerIndex, setQdbs)
        case 'newQuestions':
            return handleNewQuestions(qdbs, msg, workerIndex, setQdbs)
        case 'newdb':
            return handleNewDb(qdbs, msg, workerIndex, setQdbs)
        case 'dbClean':
            return handleDbClean(qdbs, msg, workerIndex)
        case 'rmQuestions':
            return handleRmQuestions(qdbs, msg, workerIndex, setQdbs)
        case 'sendQuestionsToPeers':
            return handleQuestionsToPeers(qdbs, msg, workerIndex)
        case 'sendUsersToPeers':
            return handleUsersToPeers(qdbs, msg, workerIndex)
        case 'sendUserFilesToPeers':
            return handleUserFilesToPeers(qdbs, msg, workerIndex)
        default:
            logger.Log(`Invalid msg type!`, logger.GetColor('redbg'))
            console.error(msg)

            parentPort.postMessage({
                msg: `From thread #${workerIndex}: Invalid message type (${
                    (msg as any)?.type
                })!`,
                workerIndex: workerIndex,
            })
            return null
            break
    }
}