/* eslint-disable @typescript-eslint/no-explicit-any */
// 面板内容渲染 — 执行 PromQL 查询并渲染真实数据 // Logan.Li
import { useState, useEffect, useCallback } from 'react';
import { TrendingUp, Loader2, AlertCircle } from 'lucide-react';
import { LineChart, Line, ResponsiveContainer, XAxis, YAxis, Tooltip, CartesianGrid } from 'recharts';
import type { Panel } from './GrafanaDashboard';
import { prometheusProxyApi, promDatasourceApi } from '@/api';

// 默认 Prometheus URL 缓存
let _defaultPromURL: string | null = null;

async function getDefaultPromURL(dashboardURL?: string): Promise<string> {
  // 1. 优先使用仪表盘指定的 URL
  if (dashboardURL) return dashboardURL;
  // 2. 缓存命中
  if (_defaultPromURL) return _defaultPromURL;
  // 3. 查询默认 Prometheus 数据源
  try {
    const res = await promDatasourceApi.list();
    const list = (res as any[]) ?? [];
    const def = list.find((d: any) => d.is_default) || list[0];
    if (def?.url) {
      _defaultPromURL = def.url;
      return def.url;
    }
  } catch {
    // ignore
  }
  return '';
}

// 解析 Prometheus range query 结果
function parseRangeResult(promResult: any): { time: string; value: number }[] {
  try {
    const result = promResult?.data?.result;
    if (!Array.isArray(result) || result.length === 0) return [];

    // 取第一条时间序列（多序列时合并取均值）
    const series = result[0];
    const values = series?.values;
    if (!Array.isArray(values)) return [];

    return values.map((v: any) => {
      const ts = v[0] as number;
      const val = parseFloat(v[1] as string) || 0;
      const d = new Date(ts * 1000);
      return {
        time: `${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}`,
        value: Math.round(val * 100) / 100,
      };
    });
  } catch {
    return [];
  }
}

// 解析 Prometheus instant query 结果
function parseInstantResult(promResult: any): { labels: Record<string, string>; value: number }[] {
  try {
    const result = promResult?.data?.result;
    if (!Array.isArray(result)) return [];
    return result.map((r: any) => ({
      labels: r.metric ?? {},
      value: parseFloat(Array.isArray(r.value) ? r.value[1] : '0') || 0,
    }));
  } catch {
    return [];
  }
}

/** 渲染面板内容 */
export function GrafanaPanelContent({ panel, datasourceUrl }: { panel: Panel; datasourceUrl?: string }) {
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');
  const [chartData, setChartData] = useState<{ time: string; value: number }[]>([]);
  const [instantData, setInstantData] = useState<{ labels: Record<string, string>; value: number }[]>([]);

  const fetchData = useCallback(async () => {
    if (!panel.query) return;
    setLoading(true);
    setError('');
    try {
      const url = await getDefaultPromURL(datasourceUrl);
      if (!url) {
        setError('未配置 Prometheus 数据源');
        setLoading(false);
        return;
      }

      if (panel.type === 'graph') {
        // 范围查询：最近 1 小时，1 分钟步长
        const now = Math.floor(Date.now() / 1000);
        const start = now - 3600;
        const res = await prometheusProxyApi.queryRange({
          url,
          query: panel.query,
          start: String(start),
          end: String(now),
          step: '1m',
        });
        const parsed = parseRangeResult(res);
        setChartData(parsed.length > 0 ? parsed : []);
        if (parsed.length === 0) setError('无数据');
      } else {
        // stat / gauge / table 用即时查询
        const res = await prometheusProxyApi.query(url, panel.query);
        const parsed = parseInstantResult(res);
        setInstantData(parsed);
        if (parsed.length === 0) setError('无数据');
      }
    } catch (e: any) {
      setError(e?.message ? String(e.message).slice(0, 80) : '查询失败');
    } finally {
      setLoading(false);
    }
  }, [panel.query, panel.type, datasourceUrl]);

  useEffect(() => {
    fetchData();
    // 自动刷新（每 30s）
    const id = setInterval(fetchData, 30000);
    return () => clearInterval(id);
  }, [fetchData]);

  // Loading 状态
  if (loading && chartData.length === 0 && instantData.length === 0) {
    return (
      <div className="flex items-center justify-center h-full min-h-[120px]">
        <Loader2 className="w-5 h-5 animate-spin text-[var(--dg-text-muted)]" />
      </div>
    );
  }

  // Error 状态
  if (error && chartData.length === 0 && instantData.length === 0) {
    return (
      <div className="flex flex-col items-center justify-center h-full min-h-[120px] text-[var(--dg-text-muted)]">
        <AlertCircle className="w-5 h-5 mb-1 opacity-50" />
        <span className="text-[11px]">{error}</span>
      </div>
    );
  }

  switch (panel.type) {
    case 'stat': {
      const val = instantData[0]?.value ?? 0;
      const unit = (panel.options as any)?.unit ?? '';
      return (
        <div className="flex flex-col items-center justify-center h-full min-h-[120px]">
          <span className="text-4xl font-bold dg-text-blue">
            {val > 1000 ? (val / 1000).toFixed(1) + 'K' : val.toFixed(2)}
          </span>
          {unit && <span className="text-sm text-[var(--dg-text-muted)] mt-2">{unit}</span>}
          <div className="flex items-center gap-1 mt-2 dg-text-green text-sm">
            <TrendingUp className="w-4 h-4" />
            <span>实时</span>
          </div>
        </div>
      );
    }
    case 'gauge': {
      const val = instantData[0]?.value ?? 0;
      const pct = Math.min(val, 100);
      return (
        <div className="flex flex-col items-center justify-center h-full min-h-[120px]">
          <div className="relative w-24 h-24">
            <svg className="w-full h-full" viewBox="0 0 100 100">
              <circle cx="50" cy="50" r="40" fill="none" stroke="var(--dg-border)" strokeWidth="10" />
              <circle
                cx="50"
                cy="50"
                r="40"
                fill="none"
                stroke={pct > 80 ? '#ef4444' : pct > 60 ? '#f59e0b' : '#3b82f6'}
                strokeWidth="10"
                strokeDasharray={`${(pct / 100) * 251} 251`}
                transform="rotate(-90 50 50)"
                style={{ transition: 'stroke-dasharray 0.5s ease' }}
              />
            </svg>
            <div className="absolute inset-0 flex items-center justify-center">
              <span className="text-xl font-bold">{pct.toFixed(1)}%</span>
            </div>
          </div>
          <span className="text-sm text-[var(--dg-text-muted)] mt-2">{panel.title}</span>
        </div>
      );
    }
    case 'table': {
      if (instantData.length === 0) return <div className="text-center py-4 text-xs text-[var(--dg-text-muted)]">无数据</div>;
      return (
        <div className="overflow-auto max-h-[200px]">
          <table className="w-full text-[11px]">
            <thead>
              <tr className="border-b border-[var(--dg-border)]">
                {Object.keys(instantData[0]?.labels ?? {}).slice(0, 3).map((k) => (
                  <th key={k} className="text-left py-1 px-2 font-medium text-[var(--dg-text-secondary)]">{k}</th>
                ))}
                <th className="text-right py-1 px-2 font-medium text-[var(--dg-text-secondary)]">value</th>
              </tr>
            </thead>
            <tbody>
              {instantData.slice(0, 20).map((row, i) => (
                <tr key={i} className="border-b border-[var(--dg-border)]/50">
                  {Object.entries(row.labels).slice(0, 3).map(([k, v]) => (
                    <td key={k} className="py-1 px-2 text-[var(--dg-text-secondary)]">{v}</td>
                  ))}
                  <td className="py-1 px-2 text-right font-mono dg-text-blue">{row.value.toFixed(2)}</td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      );
    }
    case 'graph':
    default: {
      if (chartData.length === 0) {
        return <div className="text-center py-4 text-xs text-[var(--dg-text-muted)]">无数据</div>;
      }
      return (
        <div className="h-full min-h-[120px]">
          <ResponsiveContainer width="100%" height="100%">
            <LineChart data={chartData} margin={{ top: 5, right: 10, bottom: 5, left: -20 }}>
              <CartesianGrid strokeDasharray="3 3" stroke="var(--dg-border)" opacity={0.3} />
              <XAxis dataKey="time" tick={{ fontSize: 10, fill: 'var(--dg-text-muted)' }} interval="preserveStartEnd" />
              <YAxis tick={{ fontSize: 10, fill: 'var(--dg-text-muted)' }} width={45} />
              <Tooltip
                contentStyle={{
                  background: 'var(--dg-bg-secondary)',
                  border: '1px solid var(--dg-border)',
                  borderRadius: '6px',
                  fontSize: '12px',
                }}
                labelStyle={{ color: 'var(--dg-text-primary)' }}
              />
              <Line
                type="monotone"
                dataKey="value"
                stroke="#3b82f6"
                strokeWidth={2}
                dot={false}
                animationDuration={300}
              />
            </LineChart>
          </ResponsiveContainer>
        </div>
      );
    }
  }
}