// v1的时候就连统计信息也5秒获取一次，不妥，所以改成逻辑触发刷新
import React, { useState, useEffect, useCallback } from 'react';
import {
  makeStyles,
  tokens,
  Card,
  CardHeader,
  Text,
  Spinner,
  Badge,
  Button,
  useToastController,
  Toast,
  ToastTitle,
} from '@fluentui/react-components';
import { 
  CheckmarkCircle20Filled, 
  DismissCircle20Filled,
  ArrowClockwise20Regular
} from '@fluentui/react-icons';
import { useLayout } from '../context/LayoutContext';
import { testApiStatus, getStatics } from '../api';
import type { StaticsData } from '../api';

const useStyles = makeStyles({
  container: {
    display: 'flex',
    flexDirection: 'column',
    gap: tokens.spacingVerticalS,
    width: '100%',
  },
  card: {
    width: '100%',
  },
  statusContainer: {
    padding: `${tokens.spacingVerticalS} ${tokens.spacingHorizontalM}`,
    paddingBottom: tokens.spacingVerticalM,
  },
  statusText: {
    display: 'flex',
    alignItems: 'center',
    gap: tokens.spacingHorizontalSNudge,
  },
  online: {
    color: tokens.colorStatusSuccessForeground1,
    fontSize: tokens.fontSizeBase200,
  },
  offline: {
    color: tokens.colorStatusDangerForeground1,
    fontSize: tokens.fontSizeBase200,
  },
  statsContainer: {
    padding: `${tokens.spacingVerticalS} ${tokens.spacingHorizontalM}`,
    paddingBottom: tokens.spacingVerticalM,
    display: 'flex',
    flexDirection: 'column',
    gap: '4px',
  },
  statRow: {
    display: 'flex',
    justifyContent: 'space-between',
    alignItems: 'center',
  },
  refreshButton: {
    minWidth: 'auto',
    padding: '2px',
  },
  labelText: {
    fontSize: tokens.fontSizeBase200,
  },
  headerText: {
    fontSize: tokens.fontSizeBase300,
    fontWeight: tokens.fontWeightSemibold,
  }
});

const StatusDisplay: React.FC = () => {
  const styles = useStyles();
  const { toasterId, refreshTrigger } = useLayout();
  const { dispatchToast } = useToastController(toasterId);
  const [isApiOnline, setIsApiOnline] = useState<boolean | null>(null);
  const [statics, setStatics] = useState<StaticsData | null>(null);
  const [isTestLoading, setIsTestLoading] = useState<boolean>(true);
  const [isStaticsLoading, setIsStaticsLoading] = useState<boolean>(true);
  const checkStatus = useCallback(async () => {
    const online = await testApiStatus();
    setIsApiOnline(online);
    setIsTestLoading(false);
  }, []);
  const refreshStatics = useCallback(async (isManual: boolean = false) => {
    setIsStaticsLoading(true);
    try {
      const data = await getStatics();
      setStatics(data);
      if (isManual) {
        dispatchToast(
          <Toast>
            <ToastTitle>统计数据已刷新</ToastTitle>
          </Toast>,
          { intent: 'success' }
        );
      }
    } catch (error) {
      console.error('Failed to refresh statics:', error);
      setStatics(null); // 失败时重置数据
    } finally {
      setIsStaticsLoading(false);
    }
  }, [dispatchToast]);

  useEffect(() => {
    // 初始加载
    checkStatus();
    refreshStatics(false);

    // 每 10 秒测试一次后端 API 状态
    const testInterval = setInterval(checkStatus, 10000);
    
    return () => {
      clearInterval(testInterval);
    };
  }, [checkStatus, refreshStatics]);

  // Listen for global refresh trigger
  useEffect(() => {
    if (refreshTrigger > 0) {
      refreshStatics(false);
    }
  }, [refreshTrigger, refreshStatics]);

  return (
    <div className={styles.container}>
      <Card className={styles.card}>
        <CardHeader
          header={<Text className={styles.headerText}>系统状态</Text>}
        />
        <div className={styles.statusContainer}>
          {isTestLoading && isApiOnline === null ? (
            <Spinner size="tiny" label="检查中..." />
          ) : (
            <div className={styles.statusText}>
              {isApiOnline ? (
                <>
                  <CheckmarkCircle20Filled fontSize={16} className={styles.online} />
                  <Text className={styles.online}>在线</Text>
                </>
              ) : (
                <>
                  <DismissCircle20Filled fontSize={16} className={styles.offline} />
                  <Text className={styles.offline}>离线</Text>
                </>
              )}
            </div>
          )}
        </div>
      </Card>

      <Card className={styles.card}>
        <CardHeader
          header={<Text className={styles.headerText}>统计数据</Text>}
          action={
            <Button
              className={styles.refreshButton}
              appearance="subtle"
              icon={<ArrowClockwise20Regular fontSize={16} />}
              onClick={() => refreshStatics(true)}
              disabled={isStaticsLoading}
              title="刷新统计数据"
            />
          }
        />
        <div className={styles.statsContainer}>
          {isStaticsLoading && !statics ? (
            <Spinner size="tiny" label="加载中..." />
          ) : statics ? (
            <>
              <div className={styles.statRow}>
                <Text className={styles.labelText}>投稿数量:</Text>
                <Badge size="small" appearance="outline" color="brand">{statics.posts}</Badge>
              </div>
              <div className={styles.statRow}>
                <Text className={styles.labelText}>评论数量:</Text>
                <Badge size="small" appearance="outline" color="brand">{statics.comments}</Badge>
              </div>
              <div className={styles.statRow}>
                <Text className={styles.labelText}>图片数量:</Text>
                <Badge size="small" appearance="outline" color="brand">{statics.images}</Badge>
              </div>
            </>
          ) : (
            <Text className={styles.labelText} italic>统计数据获取失败。</Text>
          )}
        </div>
      </Card>
    </div>
  );
};

export default StatusDisplay;