// SNMP 设备可观测面板 — 多指标趋势图 // Logan.Li
import { useCallback, useEffect, useState } from 'react';
import { Card, CardContent } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import {
  Select, SelectContent, SelectItem, SelectTrigger, SelectValue,
} from '@/components/ui/select';
import { Activity, LineChart, Loader2, RefreshCw } from 'lucide-react';
import { snmpApi } from '@/api';
import type {
  SnmpDevice, SnmpHistoryPoint, SnmpMetricSeries, SnmpTimeRange,
} from './helpers';
import {
  SNMP_TIME_RANGE_HOURS, fmtMetricValue, isSnmpCounterMetric, metricColor, pickSeriesByCategory,
} from './helpers';
import { SnmpMetricTrendChart } from './SnmpMetricTrendChart';
import { useTranslation } from 'react-i18next';

interface Props {
  device: SnmpDevice | null;
  templateName: string;
}

interface ChartBlock {
  series: SnmpMetricSeries;
  data: SnmpHistoryPoint[];
  unit?: string;
  loading: boolean;
}

export function SnmpDeviceChartsPanel({ device, templateName }: Props) {
  const { t } = useTranslation();
  const [timeRange, setTimeRange] = useState<SnmpTimeRange>('24h');
  const [series, setSeries] = useState<SnmpMetricSeries[]>([]);
  const [charts, setCharts] = useState<ChartBlock[]>([]);
  const [loading, setLoading] = useState(false);

  const loadCharts = useCallback(async () => {
    if (!device) return;
    setLoading(true);
    try {
      const seriesRes = await snmpApi.getDeviceMetricSeries(device.id) as { list?: SnmpMetricSeries[] };
      const allSeries = seriesRes?.list || [];
      setSeries(allSeries);
      const picked = pickSeriesByCategory(allSeries);
      const hours = SNMP_TIME_RANGE_HOURS[timeRange];

      const blocks = await Promise.all(
        picked.map(async (s) => {
          try {
            const histRes = await snmpApi.getDeviceMetricHistory(device.id, {
              metric_name: s.name,
              index: s.index || undefined,
              hours,
            }) as { list?: SnmpHistoryPoint[]; rate_unit?: string };
            const unit = histRes?.rate_unit || (isSnmpCounterMetric(s.name) ? 'bps' : s.unit);
            return {
              series: s,
              data: histRes?.list || [],
              unit,
              loading: false,
            };
          } catch {
            return { series: s, data: [], loading: false };
          }
        }),
      );
      setCharts(blocks);
    } catch {
      setSeries([]);
      setCharts([]);
    } finally {
      setLoading(false);
    }
  }, [device, timeRange]);

  useEffect(() => { loadCharts(); }, [loadCharts]);

  // 30s 静默刷新趋势 // Logan.Li
  useEffect(() => {
    if (!device) return;
    const timer = setInterval(loadCharts, 30_000);
    return () => clearInterval(timer);
  }, [device, loadCharts]);

  if (!device) {
    return (
      <Card className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)]">
        <CardContent className="p-8 text-center text-sm text-[var(--dg-text-muted)]">
          点击设备行查看 CPU / 内存 / 温度 / 风扇趋势图
        </CardContent>
      </Card>
    );
  }

  const latestCpu = series.find((s) => s.name.includes('cpu'));
  const latestMem = series.find((s) => s.name.includes('mem'));

  return (
    <Card className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)]">
      <CardContent className="p-4">
        <div className="flex items-center justify-between gap-2 mb-4 flex-wrap">
          <div className="flex items-center gap-2 min-w-0">
            <Activity className="h-4 w-4 text-[var(--dg-text-muted)] shrink-0" />
            <h3 className="text-sm font-medium text-[var(--dg-text-primary)] truncate">
              可观测 · {device.name}
            </h3>
            <Badge variant="outline" className="text-[10px] border-[var(--dg-border)] shrink-0">
              {templateName}
            </Badge>
          </div>
          <div className="flex items-center gap-1.5 shrink-0">
            <Select value={timeRange} onValueChange={(v) => setTimeRange(v as SnmpTimeRange)}>
              <SelectTrigger className="h-7 w-[88px] text-xs">
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="6h"> {t('monitor.siteProtocol.rangeDefault')} </SelectItem>
                <SelectItem value="24h"> {t('monitor.lbl.selectTemplate')} </SelectItem>
                <SelectItem value="7d"> {t('monitor.lbl.selectTemplate')} </SelectItem>
              </SelectContent>
            </Select>
            <Button variant="outline" size="sm" className="h-7 text-xs" onClick={loadCharts} disabled={loading}>
              <RefreshCw className={`h-3 w-3 mr-1 ${loading ? 'animate-spin' : ''}`} />
              刷新
            </Button>
          </div>
        </div>

        <div className="grid grid-cols-3 gap-3 mb-4">
          {[
            { label: t('monitor.lbl.totalDevices'), value: latestCpu ? fmtMetricValue(latestCpu.latest_value, latestCpu.unit || '%') : '--' },
            { label: t('monitor.lbl.totalDevices'), value: latestMem ? fmtMetricValue(latestMem.latest_value, latestMem.unit || '%') : '--' },
            { label: t('monitor.lbl.totalDevices'), value: t('monitor.lbl.totalDevices') },
          ].map((item) => (
            <div key={item.label} className="rounded-lg bg-[var(--dg-bg-tertiary)] p-3 text-center">
              <p className="text-[10px] text-[var(--dg-text-muted)]">{item.label}</p>
              <p className="text-sm font-mono font-medium text-[var(--dg-text-primary)] mt-0.5">{item.value}</p>
            </div>
          ))}
        </div>

        {loading ? (
          <div className="py-12 flex items-center justify-center text-sm text-[var(--dg-text-muted)]">
            <Loader2 className="h-4 w-4 animate-spin mr-2" />加载趋势...
          </div>
        ) : charts.length === 0 ? (
          <div className="py-12 text-center text-sm text-[var(--dg-text-muted)]">
            暂无可视化指标，请先完成至少一次采集
          </div>
        ) : (
          <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
            {charts.map((block) => (
              <div
                key={`${block.series.name}-${block.series.index || ''}`}
                className="rounded-lg border border-[var(--dg-border)] bg-[var(--dg-bg-tertiary)] p-3"
              >
                <div className="flex items-center gap-2 mb-2">
                  <LineChart className="h-3.5 w-3.5 text-[var(--dg-text-muted)]" />
                  <span className="text-xs font-medium text-[var(--dg-text-primary)]">{block.series.label}</span>
                  <span className="text-xs font-mono text-[var(--dg-text-muted)] ml-auto">
                    {block.data.length > 0
                      ? fmtMetricValue(block.data[block.data.length - 1].value, block.unit)
                      : fmtMetricValue(block.series.latest_value, block.series.unit)}
                  </span>
                </div>
                <SnmpMetricTrendChart
                  data={block.data}
                  color={metricColor(block.series.name)}
                  unit={block.unit}
                />
              </div>
            ))}
          </div>
        )}
      </CardContent>
    </Card>
  );
}