import { createFileRoute } from '@tanstack/react-router'
import { useQuery } from '@tanstack/react-query'
import { Bird, RefreshCw } from 'lucide-react'

import { Button } from '@evobgp/ui/components/button'
import { Progress } from '@evobgp/ui/components/progress'
import { MonitoringHealthCard } from '@/components/analytics'
import { MonitoringReadyGrid } from '@/components/monitoring/monitoring-ready-grid'
import { PageHeader } from '@/components/page-header'
import { QueryState } from '@/components/query-state'
import { FrameSection } from '@/components/reui-kit'
import { StatusBadge } from '@/components/status-badge'
import { jobKindRu } from '@/lib/ui-labels'

import {
  monitoringHealthQueryOptions,
  monitoringReadyQueryOptions,
  monitoringVersionQueryOptions,
  type VersionInfo,
} from '@/queries/monitoring'
import { networkBirdQueryOptions } from '@/queries/network'
import { operationsJobsQueryOptions } from '@/queries/operations'

export const Route = createFileRoute('/_auth/monitoring')({
  component: MonitoringComponent,
})

function MonitoringComponent() {
  const healthQ = useQuery(monitoringHealthQueryOptions())
  const readyQ = useQuery(monitoringReadyQueryOptions())
  const versionQ = useQuery(monitoringVersionQueryOptions())
  const birdQ = useQuery(networkBirdQueryOptions())
  const jobsQ = useQuery(operationsJobsQueryOptions())

  const refreshing =
    healthQ.isFetching ||
    readyQ.isFetching ||
    versionQ.isFetching ||
    birdQ.isFetching ||
    jobsQ.isFetching

  const jobs = jobsQ.data?.items ?? []
  const versionText = formatVersion(versionQ.data)

  function refetchAll() {
    void healthQ.refetch()
    void readyQ.refetch()
    void versionQ.refetch()
    void birdQ.refetch()
    void jobsQ.refetch()
  }

  const failedJobs = jobs
    .filter((j) => ['failed', 'error', 'cancelled'].includes(j.status.toLowerCase()))
    .slice(0, 5)

  return (
    <div className="flex flex-col gap-4 md:gap-6">
      <PageHeader
        title="Мониторинг"
        description={`Состояние API, BGP и задач для диагностики инцидентов${
          versionText !== '—'
            ? ` · версия ${versionText}${
                versionQ.data?.git_sha ? ` (${versionQ.data.git_sha.slice(0, 8)})` : ''
              }`
            : ''
        }`}
        actions={
          <Button variant="outline" size="sm" onClick={refetchAll} disabled={refreshing}>
            <RefreshCw className={refreshing ? 'animate-spin' : ''} />
            Обновить
          </Button>
        }
      />

      <div className="grid items-stretch gap-4 md:gap-6 lg:grid-cols-2">
        <MonitoringHealthCard
          healthOk={healthQ.data?.ok ?? false}
          ready={readyQ.data}
          loading={healthQ.isLoading || readyQ.isLoading}
        />
        <FrameSection
          title={
            <span className="flex items-center gap-2">
              <Bird className="size-4" />
              BGP на API-хосте
            </span>
          }
          description="Статус BIRD на хосте API"
          className="h-full"
          contentClassName="px-5 py-4"
        >
          <QueryState
            data={birdQ.data}
            isLoading={birdQ.isLoading}
            isError={birdQ.isError}
            error={birdQ.error}
            skeleton={<div className="h-40" />}
            onRetry={() => birdQ.refetch()}
          >
            {(bird) => <BirdSummary bird={bird} />}
          </QueryState>
        </FrameSection>
      </div>

      <QueryState
        data={readyQ.data}
        isLoading={readyQ.isLoading}
        isError={readyQ.isError}
        error={readyQ.error}
        skeleton={<div className="h-40" />}
        onRetry={() => readyQ.refetch()}
      >
        {(ready) => <MonitoringReadyGrid health={healthQ.data} ready={ready} />}
      </QueryState>

      {failedJobs.length > 0 ? (
        <FrameSection title="Последние ошибки" contentClassName="px-5 py-4">
          <ul className="flex flex-col gap-2">
            {failedJobs.map((job) => (
              <li key={job.job_id} className="rounded-lg border px-3 py-2 text-sm">
                <div className="flex items-start justify-between gap-2">
                  <p className="font-medium">{jobKindRu(job.kind)}</p>
                  <StatusBadge status={job.status} />
                </div>
                {job.error ? (
                  <p className="mt-1 text-xs text-muted-foreground">
                    {job.error.slice(0, 120)}
                    {job.error.length > 120 ? '…' : ''}
                  </p>
                ) : null}
              </li>
            ))}
          </ul>
        </FrameSection>
      ) : null}
    </div>
  )
}

function formatVersion(version?: VersionInfo | null): string {
  if (!version) return '—'
  return version.version ?? version.app ?? '—'
}

function BirdSummary({ bird }: { bird: import('@/types/api').BirdStatus }) {
  if (!bird.birdc_configured) {
    return (
      <p className="text-sm text-muted-foreground">
        {bird.message ?? 'birdc не настроен на API-хосте (EVOBGP_BIRDC_SOCKET).'}
      </p>
    )
  }
  const ratio =
    bird.bgp_sessions_total > 0
      ? Math.round((bird.bgp_established / bird.bgp_sessions_total) * 100)
      : null
  return (
    <div className="flex flex-col gap-2">
      <div className="flex items-center justify-between text-sm">
        <span className="text-muted-foreground">Установлено / всего</span>
        <span className="font-medium tabular-nums">
          {bird.bgp_established} / {bird.bgp_sessions_total}
          {ratio !== null ? <span className="text-muted-foreground"> ({ratio}%)</span> : null}
        </span>
      </div>
      {ratio !== null ? (
        <Progress
          value={ratio}
          aria-label="Установлено BGP-сессий"
          className={
            ratio >= 100
              ? '[&_[data-slot=progress-indicator]]:bg-success'
              : ratio >= 50
                ? '[&_[data-slot=progress-indicator]]:bg-warning'
                : '[&_[data-slot=progress-indicator]]:bg-destructive'
          }
        />
      ) : null}
      {bird.error ? <p className="text-xs text-destructive">{bird.error}</p> : null}
    </div>
  )
}