import { NextFetchEvent, NextMiddleware } from 'next/server';
import settings from 'settings';
import { PzNextRequest } from '.';
import logger from '../utils/log';
import { basket } from '../data/urls';
import { urlLocaleMatcherRegex } from '../utils';

const resetBasket = async (req: PzNextRequest) => {
  await fetch(`${settings.commerceUrl}${basket.getBasket}`, {
    method: 'DELETE',
    headers: {
      Cookie: req.headers.get('cookie') || '',
      'Content-Type': 'application/json',
      'X-CSRFToken': req.cookies.get('csrftoken')?.value ?? '',
      Referer: settings.commerceUrl
    }
  });
};

const withCurrency =
  (middleware: NextMiddleware) =>
  async (req: PzNextRequest, event: NextFetchEvent) => {
    const ip = req.headers.get('x-forwarded-for') ?? '';

    try {
      const { currencies, defaultCurrencyCode, defaultLocaleValue } =
        settings.localization;
      const locale = req.middlewareParams.rewrites.locale ?? defaultLocaleValue;
      const url = req.nextUrl.clone();

      if (!defaultCurrencyCode) {
        logger.error('Default currency code is not defined in settings.', {
          ip
        });
        throw new Error(
          'Default currency code is not defined. Use `defaultCurrencyCode` property in `localization` object in `settings.js` file.'
        );
      }

      const getActiveCurrencyCode =
        settings.localization.getActiveCurrencyCode ??
        (({ req }) => {
          return (
            req.cookies.get('pz-currency')?.value ??
            settings.localization.defaultCurrencyCode
          );
        });

      let activeCurrency = getActiveCurrencyCode({
        req,
        locale,
        defaultCurrencyCode
      });

      if (req.cookies.get('pz-set-currency')) {
        activeCurrency = req.cookies.get('pz-set-currency')?.value;
      }

      if (
        !activeCurrency ||
        !currencies.find((c) => c.code === activeCurrency)
      ) {
        logger.warn(
          `Currency ${activeCurrency} is not defined in settings. Using default currency ${defaultCurrencyCode} instead.`,
          {
            ip
          }
        );
        activeCurrency = defaultCurrencyCode;
      }

      if (
        req.cookies.get('pz-currency') &&
        req.cookies.get('pz-currency')?.value !== activeCurrency &&
        url.pathname.match(urlLocaleMatcherRegex) &&
        !url.search.includes('mobile_app=true') &&
        !url.search.includes('page=CreditCardThreeDSecurePage') &&
        !url.search.includes('page=RedirectionPageCompletePage') &&
        settings.resetBasketOnCurrencyChange !== false
      ) {
        logger.info('Currency changed. Resetting basket...', {
          sessionid: req.cookies.get('osessionid')?.value ?? '',
          oldCurrency: req.cookies.get('pz-currency')?.value,
          newCurrency: activeCurrency,
          ip
        });

        resetBasket(req);
      }

      req.middlewareParams.rewrites.currency = activeCurrency;
    } catch (error) {
      logger.error('withCurrency error', {
        error,
        ip
      });
    }

    return middleware(req, event);
  };

export default withCurrency;