import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
import type { TFunction } from 'i18next';
import { useTranslation } from 'react-i18next';
import { Button, Checkbox, Form, Input, Modal, Select, Tag } from 'antd';
import { DownloadOutlined, SyncOutlined } from '@ant-design/icons';

import { HttpUtil, FileManager, IntlUtil, PromiseUtil } from '@/utils';
import { activateOnKey } from '@/utils/a11y';
import { useDatepicker } from '@/hooks/useDatepicker';
import { useMediaQuery } from '@/hooks/useMediaQuery';
import './XrayLogModal.css';

interface XrayLogModalProps {
  open: boolean;
  onClose: () => void;
}

interface XrayLogEntry {
  DateTime?: string | number;
  FromAddress?: string;
  ToAddress?: string;
  Inbound?: string;
  Outbound?: string;
  Email?: string;
  Event?: number;
}

// The downloaded log is a data format people grep, so it keeps the stable
// tokens; only what is rendered on screen follows the panel language.
const EVENT_TOKENS: Record<number, string> = { 0: 'DIRECT', 1: 'BLOCKED', 2: 'PROXY' };

const EVENT_KEYS: Record<number, string> = {
  0: 'pages.index.accessDirect',
  1: 'pages.index.accessBlocked',
  2: 'pages.index.accessProxy',
};
const EVENT_COLORS: Record<number, string> = { 0: 'green', 1: 'red', 2: 'blue' };

function eventToken(ev?: number): string {
  return EVENT_TOKENS[ev ?? -1] ?? String(ev ?? '');
}

function eventLabel(t: TFunction, ev?: number): string {
  const key = EVENT_KEYS[ev ?? -1];
  return key ? t(key) : String(ev ?? '');
}

function eventColor(ev?: number): string {
  return EVENT_COLORS[ev ?? -1] ?? 'default';
}

function shortTime(value?: string | number): string {
  if (!value) return '';
  const d = new Date(value);
  if (isNaN(d.getTime())) return '';
  const hh = String(d.getHours()).padStart(2, '0');
  const mm = String(d.getMinutes()).padStart(2, '0');
  const ss = String(d.getSeconds()).padStart(2, '0');
  return `${hh}:${mm}:${ss}`;
}

const AUTO_UPDATE_INTERVAL = 5000;

export default function XrayLogModal({ open, onClose }: XrayLogModalProps) {
  const { t } = useTranslation();
  const { datepicker } = useDatepicker();
  const { isMobile } = useMediaQuery();
  const [rows, setRows] = useState('20');
  const [filter, setFilter] = useState('');
  const [showDirect, setShowDirect] = useState(true);
  const [showBlocked, setShowBlocked] = useState(true);
  const [showProxy, setShowProxy] = useState(true);
  const [autoUpdate, setAutoUpdate] = useState(false);
  const [loading, setLoading] = useState(false);
  const [logs, setLogs] = useState<XrayLogEntry[]>([]);

  const orderedLogs = useMemo(() => [...logs].reverse(), [logs]);

  const runRefresh = useCallback(async () => {
    try {
      const msg = await HttpUtil.post<XrayLogEntry[]>(`/panel/api/server/xraylogs/${rows}`, {
        filter,
        showDirect,
        showBlocked,
        showProxy,
      });
      if (msg?.success) setLogs(msg.obj || []);
      await PromiseUtil.sleep(300);
    } finally {
      setLoading(false);
    }
  }, [rows, filter, showDirect, showBlocked, showProxy]);

  const refresh = useCallback(() => {
    setLoading(true);
    void runRefresh();
  }, [runRefresh]);

  const refreshRef = useRef(refresh);
  useEffect(() => {
    refreshRef.current = refresh;
  });

  // The spinner is raised during render so the fetch effect stays side-effect
  // free until its response lands.
  const refreshKey = open
    ? `${rows}\u0000${showDirect}\u0000${showBlocked}\u0000${showProxy}`
    : null;
  const [loadingKey, setLoadingKey] = useState<string | null>(null);
  if (refreshKey !== loadingKey) {
    setLoadingKey(refreshKey);
    if (refreshKey) setLoading(true);
  }

  useEffect(() => {
    if (open) void runRefresh();
  }, [open, rows, showDirect, showBlocked, showProxy, runRefresh]);

  useEffect(() => {
    if (!open || !autoUpdate) return;
    const id = setInterval(() => refreshRef.current(), AUTO_UPDATE_INTERVAL);
    return () => clearInterval(id);
  }, [open, autoUpdate]);

  function fullDate(value?: string | number): string {
    return IntlUtil.formatDate(value, datepicker);
  }

  function download() {
    if (!Array.isArray(logs) || logs.length === 0) {
      FileManager.downloadTextFile('', 'x-ui.log');
      return;
    }
    const lines = logs
      .map((l) => {
        try {
          const dt = l.DateTime ? new Date(l.DateTime) : null;
          const dateStr = dt && !isNaN(dt.getTime()) ? dt.toISOString() : '';
          const eventText = eventToken(l.Event);
          const emailPart = l.Email ? ` Email=${l.Email}` : '';
          return `${dateStr} FROM=${l.FromAddress || ''} TO=${l.ToAddress || ''} INBOUND=${l.Inbound || ''} OUTBOUND=${l.Outbound || ''}${emailPart} EVENT=${eventText}`.trim();
        } catch {
          return JSON.stringify(l);
        }
      })
      .join('\n');
    FileManager.downloadTextFile(lines, 'x-ui.log');
  }

  return (
    <Modal
      open={open}
      footer={null}
      width={isMobile ? '100vw' : '80vw'}
      style={isMobile ? { top: 0, paddingBottom: 0, maxWidth: '100vw' } : undefined}
      className={isMobile ? 'xraylog-modal-mobile' : undefined}
      onCancel={onClose}
      title={
        <>
          {t('pages.index.accessLogs')}
          <SyncOutlined
            spin={loading}
            className="reload-icon"
            role="button"
            tabIndex={0}
            aria-label={t('refresh')}
            onClick={refresh}
            onKeyDown={activateOnKey(refresh)}
          />
        </>
      }
    >
      <Form layout="inline" className="log-toolbar">
        <Form.Item>
          <Select
            value={rows}
            size="small"
            style={{ width: 100 }}
            onChange={setRows}
            options={[
              { value: '20', label: '20' },
              { value: '50', label: '50' },
              { value: '100', label: '100' },
              { value: '500', label: '500' },
              { value: '1000', label: '1000' },
            ]}
          />
        </Form.Item>
        <Form.Item label={t('filter')} className="filter-item">
          <Input
            value={filter}
            size="small"
            onChange={(e) => setFilter(e.target.value)}
            onKeyUp={(e) => {
              if (e.key === 'Enter') refresh();
            }}
          />
        </Form.Item>
        <Form.Item>
          <Checkbox checked={showDirect} onChange={(e) => setShowDirect(e.target.checked)}>
            Direct
          </Checkbox>
          <Checkbox checked={showBlocked} onChange={(e) => setShowBlocked(e.target.checked)}>
            Blocked
          </Checkbox>
          <Checkbox checked={showProxy} onChange={(e) => setShowProxy(e.target.checked)}>
            Proxy
          </Checkbox>
          <Checkbox checked={autoUpdate} onChange={(e) => setAutoUpdate(e.target.checked)}>
            {t('pages.index.autoUpdate')}
          </Checkbox>
        </Form.Item>
        <Form.Item className="download-item">
          <Button
            type="primary"
            onClick={download}
            icon={<DownloadOutlined />}
            aria-label={t('download')}
          />
        </Form.Item>
      </Form>

      <div className={`log-container ${isMobile ? 'log-container-mobile' : ''}`}>
        {orderedLogs.length === 0 ? (
          <div className="log-empty">No Record...</div>
        ) : isMobile ? (
          orderedLogs.map((log, idx) => (
            <div key={idx} className="log-card">
              <div className="log-card-head">
                <span className="log-time" title={fullDate(log.DateTime)}>
                  {shortTime(log.DateTime)}
                </span>
                <Tag color={eventColor(log.Event)} className="log-event-tag">
                  {eventLabel(t, log.Event)}
                </Tag>
              </div>
              <div className="log-route">
                <span className="log-addr">{log.FromAddress}</span>
                <span className="log-arrow">→</span>
                <span className="log-addr">{log.ToAddress}</span>
              </div>
              <div className="log-meta">
                {log.Inbound && (
                  <span className="log-meta-pair">
                    <span className="log-meta-key">in</span>
                    <span className="log-meta-val">{log.Inbound}</span>
                  </span>
                )}
                {log.Outbound && (
                  <span className="log-meta-pair">
                    <span className="log-meta-key">out</span>
                    <span className="log-meta-val">{log.Outbound}</span>
                  </span>
                )}
                {log.Email && (
                  <span className="log-meta-pair">
                    <span className="log-meta-key">email</span>
                    <span className="log-meta-val">{log.Email}</span>
                  </span>
                )}
              </div>
            </div>
          ))
        ) : (
          <table className="xraylog-table">
            <thead>
              <tr>
                <th>Date</th>
                <th>From</th>
                <th>To</th>
                <th>Inbound</th>
                <th>Outbound</th>
                <th>Email</th>
              </tr>
            </thead>
            <tbody>
              {orderedLogs.map((log, idx) => (
                <tr key={idx} className={`log-row-${log.Event}`}>
                  <td>
                    <b>{fullDate(log.DateTime)}</b>
                  </td>
                  <td>{log.FromAddress}</td>
                  <td>{log.ToAddress}</td>
                  <td>{log.Inbound}</td>
                  <td>{log.Outbound}</td>
                  <td>{log.Email}</td>
                </tr>
              ))}
            </tbody>
          </table>
        )}
      </div>
    </Modal>
  );
}