import axiosRetry from 'axios-retry';

import { configManager } from '~/server/service/config-manager';
import CronService from '~/server/service/cron';
import { getRandomIntInRange } from '~/utils/rand';

import { StatusType } from '../../interfaces/questionnaire-answer-status';
import type { IQuestionnaireOrder } from '../../interfaces/questionnaire-order';
import ProactiveQuestionnaireAnswer from '../models/proactive-questionnaire-answer';
import QuestionnaireAnswer from '../models/questionnaire-answer';
import QuestionnaireAnswerStatus from '../models/questionnaire-answer-status';
import QuestionnaireOrder from '../models/questionnaire-order';

const axios = require('axios').default;

axiosRetry(axios, { retries: 3 });

/**
 * Manages cronjob which
 *  1. fetches QuestionnaireOrders from questionnaire server
 *  2. updates QuestionnaireOrder collection to contain only the ones that exist in the fetched list and is not finished (doesn't have to be started)
 *  3. changes QuestionnaireAnswerStatuses which are 'skipped' to 'not_answered'
 *  4. resend QuestionnaireAnswers & ProactiveQuestionnaireAnswers which failed to reach questionnaire server
 */
class QuestionnaireCronService extends CronService {

  sleep = (msec: number): Promise<void> => new Promise(resolve => setTimeout(resolve, msec));

  override getCronSchedule(): string {
    return configManager.getConfig('crowi', 'app:questionnaireCronSchedule');
  }

  override async executeJob(): Promise<void> {
    // sleep for a random amount to scatter request time from GROWI apps to questionnaire server
    await this.sleepBeforeJob();

    const questionnaireServerOrigin = configManager.getConfig('crowi', 'app:questionnaireServerOrigin');

    const fetchQuestionnaireOrders = async(): Promise<IQuestionnaireOrder[]> => {
      const response = await axios.get(`${questionnaireServerOrigin}/questionnaire-order/index`);
      return response.data.questionnaireOrders;
    };

    const saveUnfinishedOrders = async(questionnaireOrders: IQuestionnaireOrder[]) => {
      const currentDate = new Date(Date.now());
      const unfinishedOrders = questionnaireOrders.filter(order => new Date(order.showUntil) > currentDate);
      await QuestionnaireOrder.insertMany(unfinishedOrders);
    };

    const changeSkippedAnswerStatusToNotAnswered = async() => {
      await QuestionnaireAnswerStatus.updateMany(
        { status: StatusType.skipped },
        { status: StatusType.not_answered },
      );
    };

    const resendQuestionnaireAnswers = async() => {
      const questionnaireAnswers = await QuestionnaireAnswer.find()
        .select('-_id -answers._id  -growiInfo._id -userInfo._id');
      const proactiveQuestionnaireAnswers = await ProactiveQuestionnaireAnswer.find()
        .select('-_id -growiInfo._id -userInfo._id');

      axios.post(`${questionnaireServerOrigin}/questionnaire-answer/batch`, { questionnaireAnswers })
        .then(async() => {
          await QuestionnaireAnswer.deleteMany();
        });
      axios.post(`${questionnaireServerOrigin}/questionnaire-answer/proactive/batch`, { proactiveQuestionnaireAnswers })
        .then(async() => {
          await ProactiveQuestionnaireAnswer.deleteMany();
        });
    };

    const questionnaireOrders: IQuestionnaireOrder[] = await fetchQuestionnaireOrders();

    resendQuestionnaireAnswers();

    // reset QuestionnaireOrder collection and save unfinished ones that exist on questionnaire server
    await QuestionnaireOrder.deleteMany();
    await saveUnfinishedOrders(questionnaireOrders);

    await changeSkippedAnswerStatusToNotAnswered();
  }

  private async sleepBeforeJob() {
    const maxHoursUntilRequest = configManager.getConfig('crowi', 'app:questionnaireCronMaxHoursUntilRequest');
    const maxSecondsUntilRequest = maxHoursUntilRequest * 60 * 60;

    const secToSleep = getRandomIntInRange(0, maxSecondsUntilRequest);
    await this.sleep(secToSleep * 1000);
  }

}

const questionnaireCronService = new QuestionnaireCronService();

export default questionnaireCronService;