// 中间件实例可观测面板 — 批量拉取 + 健康度 + 仪表盘 // Logan.Li
import { useCallback, useEffect, useMemo, 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 { middlewareMonitorApi } from '@/api';
import type { MwChartDef, MwTarget, MwTimeRange } from './helpers';
import {
  MW_TIME_RANGE_HOURS, fmtMetricDisplay, fmtMemory, fmtHitRate, fmtVal, fmtLastSeen,
  mysqlConnPct, redisMemoryPct, redisModeLabel, groupHistoryByMetric, counterToDelta,
  evalMwHealth, gaugeTone, gaugeToneLow, REDIS_PRIMARY_KEYS, MYSQL_PRIMARY_KEYS,
} from './helpers';
import { MwTrendChart } from './MwTrendChart';
import { MwGaugeBar } from './MwGaugeBar';
import { MwHealthStrip } from './MwHealthStrip';
import { ChartExpandShell } from '../shared/ChartExpandShell';
import i18n from '@/i18n';

interface Props {
  target: MwTarget | null;
  chartDefs: MwChartDef[];
  accent: 'redis' | 'mysql';
}

export function MwTargetChartsPanel({ target, chartDefs, accent }: Props) {
  const [timeRange, setTimeRange] = useState<MwTimeRange>('6h');
  const [historyMap, setHistoryMap] = useState<Record<string, Array<{ timestamp: number; value: number }>>>({});
  const [loading, setLoading] = useState(false);
  const [showAll, setShowAll] = useState(false);

  const primaryKeys = accent === 'redis' ? REDIS_PRIMARY_KEYS : MYSQL_PRIMARY_KEYS;
  const visibleDefs = useMemo(
    () => (showAll ? chartDefs : chartDefs.filter((d) => primaryKeys.includes(d.key))),
    [showAll, chartDefs, primaryKeys],
  );

  const loadCharts = useCallback(async () => {
    if (!target) return;
    setLoading(true);
    try {
      const res = await middlewareMonitorApi.getMetrics(target.id, {
        hours: MW_TIME_RANGE_HOURS[timeRange],
      }) as { list?: Array<{ metric_name: string; timestamp: number; value: number }> };
      setHistoryMap(groupHistoryByMetric(res?.list || []));
    } catch {
      setHistoryMap({});
    } finally {
      setLoading(false);
    }
  }, [target, timeRange]);

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

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

  if (!target) {
    return (
      <Card className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)] h-full">
        <CardContent className="p-8 text-center text-sm text-[var(--dg-text-muted)]">
          选择左侧实例查看趋势与健康度
        </CardContent>
      </Card>
    );
  }

  const m = target.latest_metrics || {};
  const memPct = redisMemoryPct(m);
  const connPct = mysqlConnPct(m);
  const healthIssues = evalMwHealth(target);

  return (
    <Card className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)] h-full">
      <CardContent className="p-4">
        <div className="flex items-center justify-between gap-2 mb-3 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 truncate">可观测 · {target.name}</h3>
            <Badge variant="outline" className="text-[10px] shrink-0">{target.ip}:{target.port}</Badge>
            {accent === 'redis' && (
              <Badge variant="outline" className="text-[10px] shrink-0">{redisModeLabel(target.config_public?.redis_mode)}</Badge>
            )}
            <span className="text-[10px] text-[var(--dg-text-muted)] shrink-0">更新 {fmtLastSeen(target.last_seen_at)}</span>
          </div>
          <div className="flex items-center gap-1.5">
            <Button variant="ghost" size="sm" className="h-7 text-xs" onClick={() => setShowAll((v) => !v)}>
              {showAll ? i18n.t('monitor.mwtargetchartsp.s9e75621e') : i18n.t('monitor.mwtargetchartsp.s9dea79ec')}
            </Button>
            <Select value={timeRange} onValueChange={(v) => setTimeRange(v as MwTimeRange)}>
              <SelectTrigger className="h-7 w-[92px] text-xs"><SelectValue /></SelectTrigger>
              <SelectContent>
                <SelectItem value="1h"> {i18n.t('monitor.helpersts.sf972b7b1')} </SelectItem>
                <SelectItem value="6h"> {i18n.t('monitor.siteProtocol.rangeDefault')} </SelectItem>
                <SelectItem value="24h"> {i18n.t('monitor.helpersts.s6e99b786')} </SelectItem>
                <SelectItem value="7d"> {i18n.t('monitor.helpersts.sd765efc4')} </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="mb-4"><MwHealthStrip issues={healthIssues} /></div>

        {/* 仪表盘 */}
        <div className="grid grid-cols-1 md:grid-cols-3 gap-3 mb-4">
          {accent === 'redis' && (
            <>
              <MwGaugeBar
                label={i18n.t('monitor.mwtargetchartsp.s6787355b')}
                value={(m.redis_hit_rate || 0) * 100}
                display={fmtHitRate(m.redis_hit_rate)}
                level={m.redis_hit_rate > 0 ? gaugeToneLow((m.redis_hit_rate || 0) * 100, 90, 80) : 'ok'}
              />
              <MwGaugeBar
                label={i18n.t('monitor.mwtargetchartsp.s44cdb3f7')}
                value={memPct ?? (m.redis_used_memory > 0 ? 50 : 0)}
                display={fmtMemory(m.redis_used_memory)}
                level={memPct != null ? gaugeTone(memPct, 80, 90) : 'ok'}
                hint={memPct != null ? `已用 ${memPct.toFixed(0)}%` : i18n.t('monitor.mwtargetchartsp.s1c1ce805')}
              />
              <MwGaugeBar
                label={i18n.t('kubernetes.topology.connections')}
                value={Math.min(100, (m.redis_connected_clients || 0) / 2)}
                display={fmtVal(m.redis_connected_clients)}
                level={(m.redis_blocked_clients || 0) > 0 ? 'warn' : 'ok'}
                hint={m.redis_cluster_known_nodes ? `集群 ${fmtVal(m.redis_cluster_known_nodes)} 节点` : undefined}
              />
            </>
          )}
          {accent === 'mysql' && (
            <>
              <MwGaugeBar
                label={i18n.t('monitor.mwtargetchartsp.sa2d02e56')}
                value={(m.mysql_buffer_hit_rate || 0) * 100}
                display={fmtHitRate(m.mysql_buffer_hit_rate)}
                level={m.mysql_buffer_hit_rate > 0 ? gaugeToneLow((m.mysql_buffer_hit_rate || 0) * 100, 95, 90) : 'ok'}
              />
              <MwGaugeBar
                label={i18n.t('monitor.mwtargetchartsp.se84e4bc5')}
                value={connPct ?? 0}
                display={`${fmtVal(m.mysql_connections)} / ${fmtVal(m.mysql_max_connections)}`}
                level={connPct != null ? gaugeTone(connPct, 80, 90) : 'ok'}
              />
              <MwGaugeBar
                label={i18n.t('monitor.mwtargetchartsp.se0f6abb7')}
                value={Math.min(100, (m.mysql_threads_running || 0) * 5)}
                display={fmtVal(m.mysql_threads_running)}
                level={(m.mysql_threads_running || 0) > 20 ? 'warn' : 'ok'}
                hint={`慢查询 ${fmtVal(m.mysql_slow_queries)}`}
              />
            </>
          )}
        </div>

        {/* 核心摘要 */}
        <div className="grid grid-cols-2 md:grid-cols-4 gap-2 mb-4">
          {accent === 'redis' ? (
            <>
              <SummaryTile label="QPS" value={fmtVal(m.redis_qps, 1)} />
              <SummaryTile label={i18n.t('monitor.mwtargetchartsp.s196eef1f')} value={fmtVal(m.redis_db_size)} />
              <SummaryTile label={i18n.t('monitor.mwtargetchartsp.s0a5e7a61')} value={fmtVal(m.redis_evicted_keys)} warn={(m.redis_evicted_keys || 0) > 0} />
              <SummaryTile label={i18n.t('monitor.mwtargetchartsp.s3bc8dd1f')} value={m.redis_mem_fragmentation_ratio ? fmtVal(m.redis_mem_fragmentation_ratio, 2) : '--'} />
            </>
          ) : (
            <>
              <SummaryTile label="QPS" value={fmtVal(m.mysql_qps, 1)} />
              <SummaryTile label={i18n.t('monitor.mwtargetchartsp.s3e54c81c')} value={fmtMemory(m.mysql_bytes_received)} />
              <SummaryTile label={i18n.t('monitor.mwtargetchartsp.s90d6afb7')} value={fmtMemory(m.mysql_bytes_sent)} />
              <SummaryTile label={i18n.t('agent.agentUptime')} value={m.mysql_uptime ? `${Math.floor(m.mysql_uptime / 3600)}h` : '--'} />
            </>
          )}
        </div>

        {loading ? (
          <div className="py-10 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>
        ) : (
          <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
            {visibleDefs.map((def) => {
              const series = def.counterDelta ? counterToDelta(historyMap[def.key] || []) : (historyMap[def.key] || []);
              return (
                <ChartExpandShell
                  key={def.key}
                  className="rounded-lg border border-[var(--dg-border)] bg-[var(--dg-bg-tertiary)] p-3"
                  title={`${def.label} · ${fmtMetricDisplay(def, m[def.key] ?? 0)}`}
                  icon={<LineChart className="h-3.5 w-3.5 text-[var(--dg-text-muted)] shrink-0" />}
                  compactHeight={150}
                  expandedHeight={400}
                  empty={series.length === 0}
                >
                  {(h) => (
                    <MwTrendChart
                      data={series}
                      color={def.color}
                      unit={def.unit}
                      percent={def.percent}
                      formatter={def.formatter}
                      height={h}
                    />
                  )}
                </ChartExpandShell>
              );
            })}
          </div>
        )}
      </CardContent>
    </Card>
  );
}

function SummaryTile({ label, value, warn }: { label: string; value: string; warn?: boolean }) {
  return (
    <div className={`rounded-lg p-3 text-center ${warn ? 'bg-amber-500/10' : 'bg-[var(--dg-bg-tertiary)]'}`}>
      <p className="text-[10px] text-[var(--dg-text-muted)]">{label}</p>
      <p className={`text-sm font-mono font-semibold mt-0.5 ${warn ? 'dg-text-yellow' : ''}`}>{value}</p>
    </div>
  );
}