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

import { HttpUtil, FileManager, PromiseUtil } from '@/utils';
import { useMediaQuery } from '@/hooks/useMediaQuery';
import './LogModal.css';

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

interface ParsedLog {
  date: string;
  time: string;
  stamp: string;
  levelText: string;
  levelClass: string;
  service: string;
  body: string;
}

const LEVELS = ['DEBUG', 'INFO', 'NOTICE', 'WARNING', 'ERROR'];
const LEVEL_CLASSES = ['level-debug', 'level-info', 'level-notice', 'level-warning', 'level-error'];

function parseLogLine(line: string): ParsedLog {
  const [head, ...rest] = (line || '').split(' - ');
  const message = rest.join(' - ');
  const parts = head.split(' ');

  let date = '';
  let time = '';
  let levelText: string;
  if (parts.length >= 3) {
    [date, time, levelText] = parts;
  } else {
    levelText = head;
  }

  const li = LEVELS.indexOf(levelText);
  const levelClass = li >= 0 ? LEVEL_CLASSES[li] : 'level-unknown';

  let service = '';
  let body = message || '';
  if (body.startsWith('XRAY:')) {
    service = 'XRAY:';
    body = body.slice('XRAY:'.length).trimStart();
  } else if (body) {
    service = 'X-UI:';
  }

  const stamp = [date, time].filter(Boolean).join(' ');

  return { date, time, stamp, levelText, levelClass, service, body };
}

export default function LogModal({ open, onClose }: LogModalProps) {
  const { t } = useTranslation();
  const { isMobile } = useMediaQuery();
  const [rows, setRows] = useState('20');
  const [level, setLevel] = useState('info');
  const [syslog, setSyslog] = useState(false);
  const [loading, setLoading] = useState(false);
  const [logs, setLogs] = useState<string[]>([]);
  const openRef = useRef(open);

  const refresh = useCallback(async () => {
    setLoading(true);
    try {
      const msg = await HttpUtil.post(`/panel/api/server/logs/${rows}`, {
        level,
        syslog,
      });
      if (msg?.success) {
        setLogs(msg.obj || []);
      }
      await PromiseUtil.sleep(300);
    } finally {
      setLoading(false);
    }
  }, [rows, level, syslog]);

  useEffect(() => {
    openRef.current = open;
    if (open) refresh();
  }, [open, refresh]);

  useEffect(() => {
    if (openRef.current) refresh();
  }, [rows, level, syslog, refresh]);

  const parsedLogs = useMemo(() => logs.map(parseLogLine), [logs]);

  function download() {
    FileManager.downloadTextFile(logs.join('\n'), 'x-ui.log');
  }

  const titleNode = (
    <>
      {t('pages.index.logs')}
      <SyncOutlined spin={loading} className="reload-icon" onClick={refresh} />
    </>
  );

  return (
    <Modal
      open={open}
      footer={null}
      width={isMobile ? '100vw' : 800}
      className={isMobile ? 'logmodal-mobile' : undefined}
      onCancel={onClose}
      title={titleNode}
    >
      <Form layout="inline" className="log-toolbar">
        <Form.Item>
          <Space.Compact>
            <Select value={rows} size="small" style={{ width: 70 }} onChange={setRows}>
              <Select.Option value="10">10</Select.Option>
              <Select.Option value="20">20</Select.Option>
              <Select.Option value="50">50</Select.Option>
              <Select.Option value="100">100</Select.Option>
              <Select.Option value="500">500</Select.Option>
            </Select>
            <Select value={level} size="small" style={{ width: 95 }} onChange={setLevel}>
              <Select.Option value="debug">Debug</Select.Option>
              <Select.Option value="info">Info</Select.Option>
              <Select.Option value="notice">Notice</Select.Option>
              <Select.Option value="warning">Warning</Select.Option>
              <Select.Option value="err">Error</Select.Option>
            </Select>
          </Space.Compact>
        </Form.Item>
        <Form.Item>
          <Checkbox checked={syslog} onChange={(e) => setSyslog(e.target.checked)}>
            SysLog
          </Checkbox>
        </Form.Item>
        <Form.Item className="download-item">
          <Button type="primary" onClick={download} icon={<DownloadOutlined />} />
        </Form.Item>
      </Form>

      <div className={`log-container ${isMobile ? 'log-container-mobile' : ''}`}>
        {parsedLogs.length === 0 ? (
          <div className="log-empty">No Record...</div>
        ) : isMobile ? (
          parsedLogs.map((log, idx) => (
            <div key={idx} className="log-card">
              <div className="log-card-head">
                {log.stamp && (
                  <span className="log-time">
                    {log.time && <span>{log.time}</span>}
                    {log.time && log.date ? ' ' : ''}
                    {log.date && <span className="log-date">{log.date}</span>}
                  </span>
                )}
                {log.levelText && (
                  <span className={`log-level-badge ${log.levelClass}`}>{log.levelText}</span>
                )}
              </div>
              {(log.body || log.service) && (
                <div className="log-body">
                  {log.service && <b>{log.service}</b>}
                  {log.service && log.body ? ' ' : ''}
                  {log.body && <span className="log-body-text">{log.body}</span>}
                </div>
              )}
            </div>
          ))
        ) : (
          parsedLogs.map((log, idx) => (
            <div key={idx} className="log-line">
              {log.stamp && <span className="log-stamp">{log.stamp}</span>}
              {log.stamp && log.levelText ? ' ' : ''}
              {log.levelText && <span className={`log-level ${log.levelClass}`}>{log.levelText}</span>}
              {(log.body || log.service) && (
                <>
                  <span> - </span>
                  {log.service && <b>{log.service}</b>}
                  {log.service && log.body ? ' ' : ''}
                  <span>{log.body}</span>
                </>
              )}
            </div>
          ))
        )}
      </div>
    </Modal>
  );
}