import PropTypes from 'prop-types';
import React, { useContext, useEffect, useMemo, useState } from 'react';
import { Box, Grid, Typography, Dialog, DialogContent, IconButton } from '@mui/material';
import CloseIcon from '@mui/icons-material/Close';
import Loadable from 'components/Loadable';
import { lazy } from 'react';
import { FormattedMessage, useIntl } from 'react-intl';
import { checkSysEnv } from "utils/Utils";
import backbroundImg from 'assets/images/bg_ml.jpg';
import lgceImg from 'assets/images/2025_lgce.jpg'; // <-- your popup image
import 'assets/style/loginStyles.css';
import { SysContext } from 'components/SysSettingProvider';

const AuthCard = Loadable(lazy(() => import('./AuthCardCustom')));

const BackgroundHead = {
  backgroundImage: `url(${backbroundImg})`,
  width: '100%',
  height: '100%',
  backgroundSize: 'cover'
};

const parseToDate = (v) => {
  if (v == null || v === "") return null;

  // timestamp: 10 digits (sec) or 13 digits (ms)
  const s = String(v).trim();
  if (/^\d{10,13}$/.test(s)) {
    const n = Number(s);
    return new Date(s.length === 10 ? n * 1000 : n);
  }

  // date-only: YYYY-MM-DD -> treat as LOCAL midnight
  const m = /^(\d{4})-(\d{2})-(\d{2})$/.exec(s);
  if (m) {
    const y = Number(m[1]);
    const mo = Number(m[2]) - 1; // 0-based
    const d = Number(m[3]);
    return new Date(y, mo, d, 0, 0, 0, 0);
  }

  // otherwise: ISO datetime or other formats
  const d = new Date(s);
  return Number.isNaN(d.getTime()) ? null : d;
};

const AuthWrapper = ({ children }) => {
  const intl = useIntl();
  const { sysSetting } = useContext(SysContext);

  // ===== Popup #1 (image popup) =====
  const today = new Date();
  const showUntil = new Date('2025-11-27T00:00:00');
  const [openImagePopup, setOpenImagePopup] = useState(today < showUntil);

  const handleCloseImagePopup = () => setOpenImagePopup(false);

  // ===== Popup #2 (system popup) =====
  const [openNoticePopup, setOpenNoticePopup] = useState(false);

  const popupStart = useMemo(() => parseToDate(sysSetting?.loginPopupStart), [sysSetting?.loginPopupStart]);
  const popupEnd = useMemo(() => parseToDate(sysSetting?.loginPopupEnd), [sysSetting?.loginPopupEnd]);

  const popupHtml = useMemo(() => {
    return intl.formatMessage({ id: 'loginPopupHtml', defaultMessage: '' }) || '';
  }, [intl]);

  useEffect(() => {
    const now = new Date();

    const inRange =
      (popupStart ? now >= popupStart : true) &&
      (popupEnd ? now <= popupEnd : true);

    const hasMessage = popupHtml && popupHtml.trim().length > 0;

    setOpenNoticePopup(Boolean(hasMessage && inRange));
  }, [popupHtml, popupStart, popupEnd]);

  const handleCloseNoticePopup = () => {
    setOpenNoticePopup(false);
  };

  return (
    <Box sx={{ minHeight: '87vh' }}>
      <Dialog
        open={openImagePopup}
        onClose={handleCloseImagePopup}
        aria-labelledby="election-promo-title"
        maxWidth="md"
        PaperProps={{
          sx: {
            borderRadius: 2,
            overflow: 'hidden',
            boxShadow: 6
          }
        }}
      >
        <Box sx={{ position: 'relative' }}>
          <IconButton
            aria-label="Close"
            onClick={handleCloseImagePopup}
            sx={{
              position: 'absolute',
              top: 6,
              right: 6,
              zIndex: 1,
              bgcolor: 'rgba(255,255,255,0.8)',
              '&:hover': { bgcolor: 'rgba(255,255,255,1)' }
            }}
          >
            <CloseIcon />
          </IconButton>

          <DialogContent sx={{ p: 0 }}>
            <Box
              component="img"
              src={lgceImg}
              alt={intl.formatMessage({ id: 'lgce_alt', defaultMessage: '2025 Legislative Council General Election' })}
              title={intl.formatMessage({ id: 'lgce_title', defaultMessage: '2025 Legislative Council General Election' })}
              sx={{ display: 'block', width: '100%', maxWidth: '720px', height: 'auto' }}
            />
          </DialogContent>
        </Box>
      </Dialog>

            {/* =========================
          Popup #2: system popup
         ========================= */}
      <Dialog
        open={openNoticePopup}
        onClose={handleCloseNoticePopup}
        maxWidth="md"
        PaperProps={{
          sx: {
            borderRadius: 1,
            overflow: 'hidden',
            width: { xs: '95vw', md: 900 },
            maxWidth: '95vw',
            boxShadow: 10,
            border: '1px solid #0c489e'
          }
        }}
      >
        <IconButton
          aria-label="Close"
          onClick={handleCloseNoticePopup}
          sx={{
            position: 'absolute',
            top: 8,
            right: 8,
            zIndex: 10,
            width: 34,
            height: 34,
            border: '1px solid rgba(0,0,0,0.5)',
            borderRadius: 0,
            bgcolor: '#fff'
          }}
        >
          <CloseIcon />
        </IconButton>

        <DialogContent
          sx={{
            bgcolor: '#d9ecff',
            p: 3,
            maxHeight: { xs: '70vh', md: '60vh' },
            overflowY: 'auto',
            '& h1, & h2, & h3': { marginTop: 0, marginBottom: '12px' },
            '& p': { marginBottom: '12px', lineHeight: 1.7 }
          }}
        >
          <Typography component="div" sx={{ fontSize: 18, lineHeight: 1.8 }}>
            <div dangerouslySetInnerHTML={{ __html: popupHtml }} />
          </Typography>
        </DialogContent>
      </Dialog>

      {/* =========================
          Page content
         ========================= */}
      <div style={BackgroundHead}>
        <Grid
          container
          direction="row"
          justifyContent="space-between"
          alignItems="center"
          sx={{ minHeight: '87vh' }}
        >
          <Grid item xs={12} md={8} lg={8} xl={8}>
            <Grid
              container
              direction="column"
              justifyContent="flex-start"
              alignItems="flex-start"
              sx={{ minHeight: { md: 'calc(87vh)' } }}
            >
              <Grid item xs={12} sx={{ ml: 4 }}>
                <Typography style={{ textAlign: "flex-start" }}>
                  <div
                    style={{ padding: 12 }}
                    dangerouslySetInnerHTML={{ __html: intl.formatMessage({ id: "homePageHeaderMessage" }) }}
                  />
                </Typography>
              </Grid>
              <Grid
                container
                direction="column"
                justifyContent="flex-start"
                alignItems="center"
                spacing={2}
                sx={{ minHeight: { md: 'calc(50vh)' } }}
              >
                <Grid item xs={12} sx={{ ml: 4, mt: 12, display: { xs: 'none', sm: 'block' } }}>
                  <Typography style={{ textAlign: 'center', fontSize: '1.8rem' }}>
                    <FormattedMessage id="HKSARGOV" />
                  </Typography>
                  <Typography style={{ textAlign: 'center', fontSize: '1.8rem' }}>
                    <FormattedMessage id="Gazette" />
                  </Typography>
                  <Typography style={{ textAlign: 'center', fontSize: '1.8rem' }}>
                    <FormattedMessage id="PNSPS_fullname" />
                  </Typography>
                  {checkSysEnv() !== '' ? (
                    <Typography style={{ color: 'red', textAlign: 'center', fontSize: '1.8rem' }}>
                      User Acceptance Test Environment
                    </Typography>
                  ) : (
                    ''
                  )}
                </Grid>
              </Grid>
            </Grid>
          </Grid>

          <Grid item xs={12} md={4} lg={4} xl={4}>
            <Grid
              container
              justifyContent="center"
              alignItems="center"
              sx={{ minHeight: { xs: 'calc(90vh - 134px)', md: 'calc(90vh - 112px)' } }}
            >
              <Grid item xs={12} md={11} lg={11} xl={11}>
                <AuthCard>{children}</AuthCard>
              </Grid>
            </Grid>
          </Grid>
        </Grid>
      </div>
    </Box>
  );
};

AuthWrapper.propTypes = {
  children: PropTypes.node
};

export default AuthWrapper;