import { memo, useEffect, useState } from 'react'
import { useNavigate } from 'react-router'
import { useTranslation } from 'react-i18next'
import '@/i18n/domains'
import { BarChart3, Boxes, FileWarning, Loader2, RefreshCw, ScrollText, TriangleAlert } from 'lucide-react'
import { Button } from '@/components/ui/button'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
import { PageContainer } from '@/components/PageContainer'
import { EmptyState } from '@/components/EmptyState'
import { ErrorState } from '@/components/ErrorState'
import { LoadingSpinner } from '@/components/LoadingSpinner'
import { StatCard } from '@/components/StatCard'
import { TimeRangePicker } from '@/components/TimeRangePicker'
import { logsApi, type LogSource } from '@/api/logs'
import { getUser } from '@/lib/auth-storage'
import { useAnalysisMetrics } from './hooks/useAnalysisMetrics'
import { useDailyVolume } from './hooks/useDailyVolume'
import { TrendChart } from './components/TrendChart'
import { AppStreamChart } from './components/AppStreamChart'
import { DailyVolumeChart } from './components/DailyVolumeChart'
import { NamespacePie } from './components/NamespacePie'
import { TopAppsTable } from './components/TopAppsTable'
import { IngressAnalysisSection } from './components/IngressAnalysisSection'

const toLocal = (date: Date) => new Date(date.getTime() - date.getTimezoneOffset() * 60000).toISOString().slice(0, 19)

/**
 * 日志分析页(admin 专用):SLS 风格仪表盘 — 统计卡 + 趋势折线 + 命名空间饼图 +
 * 应用流图 + 应用排行表;数据来自 5 条 LogQL 指标查询(POST /logs/metrics)。
 */
const AnalysisPage = memo(function AnalysisPage() {
  const { t } = useTranslation('analysis')
  const navigate = useNavigate()
  const isAdmin = getUser()?.role === 'admin'

  const [sources, setSources] = useState<LogSource[]>([])
  const [sourceId, setSourceId] = useState(0)
  const [start, setStart] = useState(() => toLocal(new Date(Date.now() - 3600000)))
  const [end, setEnd] = useState(() => toLocal(new Date()))

  useEffect(() => {
    logsApi.sources()
      .then(result => {
        setSources(result.list)
        setSourceId(current =>
          result.list.some(source => source.id === current)
            ? current
            : result.list.find(source => source.isDefault)?.id ?? result.list[0]?.id ?? 0,
        )
      })
      .catch(() => setSources([]))
  }, [])

  const { data, loading, error, appLabel, refresh } = useAnalysisMetrics({ sourceId, start, end, namespace: '' })
  // 每日统计固定近 7 天,不随上方时间范围变化;错误就地展示,不影响主区
  const daily = useDailyVolume({ sourceId, namespace: '', appLabel })

  // 非 admin:菜单不可见,直访时给明确提示(后端 AdminAuth 403 兜底)
  if (!isAdmin) {
    return (
      <PageContainer title={t('title')}>
        <EmptyState icon={BarChart3} title={t('adminOnly.title')} description={t('adminOnly.desc')} />
      </PageContainer>
    )
  }

  return (
    <PageContainer
      title={t('title')}
      description={t('subtitle')}
      action={
        <Button variant="outline" onClick={refresh} disabled={loading || !sourceId}>
          {loading ? <Loader2 className="mr-1 size-4 animate-spin" /> : <RefreshCw className="mr-1 size-4" />}
          {t('filter.refresh')}
        </Button>
      }
    >
      {/* 筛选栏:数据源 / 时间范围（全命名空间聚合） */}
      <div className="flex flex-wrap items-center gap-2">
        <Select
          value={sourceId ? String(sourceId) : undefined}
          onValueChange={value => setSourceId(Number(value))}
          disabled={sources.length === 0}
        >
          <SelectTrigger className="h-9 min-w-40" aria-label={t('filter.source')}>
            <SelectValue placeholder={t('filter.sourceEmpty')} />
          </SelectTrigger>
          <SelectContent>
            {sources.map(source => (
              <SelectItem key={source.id} value={String(source.id)}>{source.name}</SelectItem>
            ))}
          </SelectContent>
        </Select>
        <TimeRangePicker start={start} end={end} onChange={(nextStart, nextEnd) => { setStart(nextStart); setEnd(nextEnd) }} />
      </div>

      {sources.length === 0 ? (
        <EmptyState
          icon={BarChart3}
          title={t('emptySource.title')}
          description={t('emptySource.desc')}
          action={
            <Button variant="outline" onClick={() => navigate('/logs')}>
              {t('emptySource.goLogs')}
            </Button>
          }
        />
      ) : error ? (
        <ErrorState message={error} onRetry={refresh} />
      ) : loading && !data ? (
        <LoadingSpinner className="h-64" />
      ) : !data || !sourceId ? null : (
        <>
          <div className="grid gap-4 sm:grid-cols-2 xl:grid-cols-4">
            <StatCard label={t('stats.total')} value={data.stats.total.toLocaleString()} icon={ScrollText} iconColor="text-info" iconBg="bg-info/10" />
            <StatCard label={t('stats.errors')} value={data.stats.errorCount.toLocaleString()} icon={FileWarning} iconColor="text-destructive" iconBg="bg-destructive/10" />
            <StatCard label={t('stats.warnings')} value={data.stats.warnCount.toLocaleString()} icon={TriangleAlert} iconColor="text-warning" iconBg="bg-warning/10" />
            <StatCard label={t('stats.apps')} value={data.stats.appCount} icon={Boxes} iconColor="text-primary" iconBg="bg-primary/10" />
          </div>

          <div className="grid gap-4 lg:grid-cols-3">
            <Card className="lg:col-span-2">
              <CardHeader className="pb-3">
                <CardTitle className="text-base">{t('trend.title')}</CardTitle>
                <p className="text-xs text-muted-foreground">{t('trend.subtitle')}</p>
              </CardHeader>
              <CardContent><TrendChart trend={data.trend} /></CardContent>
            </Card>
            <Card>
              <CardHeader className="pb-3">
                <CardTitle className="text-base">{t('pie.title')}</CardTitle>
                <p className="text-xs text-muted-foreground">{t('pie.subtitle')}</p>
              </CardHeader>
              <CardContent><NamespacePie shares={data.namespaceShares} /></CardContent>
            </Card>
          </div>

          <Card>
            <CardHeader className="pb-3">
              <CardTitle className="text-base">{t('stream.title')}</CardTitle>
              <p className="text-xs text-muted-foreground">{t('stream.subtitle', { count: Math.min(data.apps.length, 10) })}</p>
            </CardHeader>
            <CardContent><AppStreamChart apps={data.apps} appTimes={data.appTimes} /></CardContent>
          </Card>

          <Card>
            <CardHeader className="pb-3">
              <div className="flex flex-wrap items-center gap-2">
                <CardTitle className="text-base">{t('daily.title')}</CardTitle>
                <span className="rounded-full bg-muted px-2 py-0.5 text-[11px] font-medium text-muted-foreground">{t('daily.fixedBadge')}</span>
              </div>
              <p className="text-xs text-muted-foreground">{t('daily.subtitle')}</p>
            </CardHeader>
            <CardContent>
              {daily.error ? (
                <ErrorState message={daily.error} onRetry={daily.refresh} />
              ) : daily.loading && !daily.data ? (
                <LoadingSpinner className="h-40" />
              ) : (
                <DailyVolumeChart days={daily.data?.days ?? []} apps={daily.data?.apps ?? []} />
              )}
            </CardContent>
          </Card>

          <Card>
            <CardHeader className="pb-3">
              <CardTitle className="text-base">{t('table.title')}</CardTitle>
              <p className="text-xs text-muted-foreground">{t('table.subtitle')}</p>
            </CardHeader>
            <CardContent>
              <TopAppsTable
                apps={data.apps.slice(0, 10)}
                total={data.stats.total}
                appLabel={appLabel}
                onViewLogs={query => navigate(`/logs?q=${encodeURIComponent(query)}`)}
              />
            </CardContent>
          </Card>

          <IngressAnalysisSection sourceId={sourceId} start={start} end={end} />
        </>
      )}
    </PageContainer>
  )
})

export default AnalysisPage