import { useEffect, useMemo, useRef, useState, type CSSProperties, type ReactNode } from 'react';
import { Card, Select, Spin, Tag, theme } from 'antd';
import { DownOutlined, UpOutlined } from '@ant-design/icons';
import type { RealtimeLog } from '../hooks/useWebSocketLogs';

/** 日志等级定义：value 越小越严格（只显示该等级及以上） */
const LOG_LEVELS = [
  { value: 0, label: '错误', key: 'error' },
  { value: 1, label: '警告+', key: 'warning' },
  { value: 2, label: '成功+', key: 'success' },
  { value: 3, label: '全部', key: 'info' },
] as const;

/** 等级权重映射 */
const LEVEL_WEIGHT: Record<string, number> = {
  error: 0,
  warning: 1,
  success: 2,
  info: 3,
  debug: 4,
};

interface RealtimeLogPanelProps {
  logs: RealtimeLog[];
  connected?: boolean;
  title?: string;
  emptyText?: ReactNode;
  height?: number | string;
  mode?: 'inline' | 'card';
  collapsible?: boolean;
  defaultVisible?: boolean;
  spinWhenEmpty?: boolean;
  style?: CSSProperties;
  bodyStyle?: CSSProperties;
}

export default function RealtimeLogPanel({
  logs,
  connected = false,
  title = '实时日志',
  emptyText = '暂无日志',
  height = '20vh',
  mode = 'inline',
  collapsible = false,
  defaultVisible = true,
  spinWhenEmpty = false,
  style,
  bodyStyle,
}: RealtimeLogPanelProps) {
  const { token } = theme.useToken();
  const [visible, setVisible] = useState(defaultVisible);
  const [levelFilter, setLevelFilter] = useState<number>(3); // 默认：全部
  const endRef = useRef<HTMLDivElement | null>(null);

  // 按等级过滤日志
  const filteredLogs = useMemo(() => {
    if (levelFilter >= 3) return logs;
    return logs.filter((log) => (LEVEL_WEIGHT[log.level] ?? 3) <= levelFilter);
  }, [logs, levelFilter]);

  useEffect(() => {
    if (visible) {
      endRef.current?.scrollIntoView({ behavior: 'smooth' });
    }
  }, [filteredLogs, visible]);

  const logColors: Record<string, string> = {
    error: token.colorError,
    success: token.colorSuccess,
    warning: token.colorWarning,
    info: token.colorText,
  };

  const logBody = (
    <div
      style={{
        height,
        overflow: 'auto',
        fontFamily: 'monospace',
        fontSize: 12,
        padding: mode === 'card' ? '8px 16px' : 4,
        backgroundColor: mode === 'card' ? undefined : token.colorBgLayout,
        borderRadius: mode === 'card' ? undefined : 4,
        ...bodyStyle,
      }}
    >
      {filteredLogs.length === 0 ? (
        spinWhenEmpty && connected ? (
          <Spin spinning size="small" />
        ) : (
          <span style={{ color: token.colorTextTertiary }}>{emptyText}</span>
        )
      ) : (
        filteredLogs.map((log, index) => (
          <div
            key={`${index}-${log.message}`}
            style={{ color: logColors[log.level] || token.colorText, lineHeight: '20px' }}
          >
            {log.message}
          </div>
        ))
      )}
      <div ref={endRef} />
    </div>
  );

  if (mode === 'card') {
    return (
      <Card
        title={title}
        size="small"
        extra={
          <Select
            size="small"
            value={levelFilter}
            onChange={setLevelFilter}
            options={LOG_LEVELS.map((l) => ({ value: l.value, label: l.label }))}
            style={{ width: 80 }}
            popupMatchSelectWidth={false}
          />
        }
        style={{ flex: 1, overflow: 'hidden', ...style }}
        styles={{ body: { height: '100%', overflow: 'hidden', padding: 0 } }}
      >
        {logBody}
      </Card>
    );
  }

  return (
    <div style={{ flexShrink: 0, borderTop: `1px solid ${token.colorBorderSecondary}`, ...style }}>
      <div
        style={{ display: 'flex', alignItems: 'center', padding: '4px 0', userSelect: 'none' }}
      >
        <span
          style={{ fontWeight: 500, fontSize: 13, cursor: collapsible ? 'pointer' : 'default' }}
          onClick={() => collapsible && setVisible((value) => !value)}
        >
          {title}
        </span>
        <Select
          size="small"
          value={levelFilter}
          onChange={setLevelFilter}
          options={LOG_LEVELS.map((l) => ({ value: l.value, label: l.label }))}
          style={{ marginLeft: 8, width: 80 }}
          popupMatchSelectWidth={false}
        />
        {collapsible && (
          visible ? <UpOutlined style={{ marginLeft: 6, fontSize: 10 }} /> : <DownOutlined style={{ marginLeft: 6, fontSize: 10 }} />
        )}
        {logs.length > 0 && <span style={{ marginLeft: 8, fontSize: 12, color: token.colorTextTertiary }}>{logs.length} 条</span>}
        {connected && <Tag color="processing" style={{ marginLeft: 8 }}>连接中</Tag>}
      </div>
      {visible && logBody}
    </div>
  );
}