import { useMemo, useState } from 'react'
import { CheckIcon, Network, SearchIcon, XIcon } from 'lucide-react'

import { Button } from '@evobgp/ui/components/button'
import { Input } from '@evobgp/ui/components/input'
import { Label } from '@evobgp/ui/components/label'

import { ConfirmDialog } from '@/components/confirm-dialog'
import { DataGridMonoCell, DataGridNameCell } from '@/components/data-grid-cell'
import { FormDrawer } from '@/components/form-drawer'
import { LoadingButton } from '@/components/loading-button'
import { SelectField } from '@/components/select-field'
import { StatusBadge } from '@/components/status-badge'
import { DataGridColumnHeader } from '@/components/reui/data-grid/data-grid-column-header'
import type { FilterField, FilterQuery } from '@/components/reui/filters/filters-types'
import {
  ResourcePage,
  createTextFilterQuery,
  type DataGridColumnDef,
} from '@/components/reui-kit'
import { bgpSessionStateRu } from '@/lib/ui-labels'
import {
  useApproveDiscoveredPeerMutation,
  useRejectDiscoveredPeerMutation,
} from '@/queries/network'
import type { PeerDiscoveryRow, SpeakerRow } from '@/types/api'

/**
 * Pending BGP peer discoveries — approve / reject.
 * @see https://reui.io/preview/base/data-grid-filtering-2
 * @see https://reui.io/preview/base/components/c-empty-1
 */

function speakerLabel(s: SpeakerRow): string {
  if (s.role === 'master') {
    const host = s.agent_domain ?? s.endpoint
    return host ? `Плоскость · ${host}` : 'Плоскость управления'
  }
  return s.agent_domain ?? s.endpoint ?? `${s.id.slice(0, 8)}…`
}

const filterFields: FilterField[] = [
  {
    id: 'neighbor',
    label: 'Сосед',
    icon: <SearchIcon className="size-3.5" aria-hidden />,
    type: 'text',
    placeholder: 'IP или ID соседа…',
  },
]

interface NetworkDiscoveredPeersCardProps {
  items: PeerDiscoveryRow[]
  speakers: SpeakerRow[]
  isLoading: boolean
  isError: boolean
  error: unknown
  onRetry: () => void
}

export function NetworkDiscoveredPeersCard({
  items,
  speakers,
  isLoading,
  isError,
  error,
  onRetry,
}: NetworkDiscoveredPeersCardProps) {
  const approveMutation = useApproveDiscoveredPeerMutation()
  const rejectMutation = useRejectDiscoveredPeerMutation()
  const [filterQuery, setFilterQuery] = useState<FilterQuery>(() =>
    createTextFilterQuery('neighbor'),
  )
  const [approveTarget, setApproveTarget] = useState<PeerDiscoveryRow | null>(null)
  const [rejectTarget, setRejectTarget] = useState<PeerDiscoveryRow | null>(null)
  const [name, setName] = useState('')
  const [speakerId, setSpeakerId] = useState<string | null>(null)

  const speakerItems = useMemo(
    () => [
      { value: '', label: 'Авто (с ноды обнаружения)' },
      ...speakers.map((s) => ({ value: s.id, label: speakerLabel(s) })),
    ],
    [speakers],
  )

  const columns = useMemo<DataGridColumnDef<PeerDiscoveryRow>[]>(
    () => [
      {
        id: 'neighbor_id',
        accessorFn: (row) => row.neighbor_id || row.neighbor,
        header: ({ column }) => (
          <DataGridColumnHeader column={column} title="ID соседа" />
        ),
        cell: ({ row }) => (
          <DataGridNameCell
            icon={Network}
            title={row.original.neighbor_id || '—'}
            subtitle={row.original.neighbor}
          />
        ),
        meta: { headerTitle: 'ID соседа' },
      },
      {
        accessorKey: 'remote_asn',
        header: ({ column }) => <DataGridColumnHeader column={column} title="ASN" />,
        cell: ({ row }) => (
          <DataGridMonoCell className="text-xs">{row.original.remote_asn || '—'}</DataGridMonoCell>
        ),
        meta: { headerTitle: 'ASN' },
      },
      {
        accessorKey: 'session_state',
        header: ({ column }) => (
          <DataGridColumnHeader column={column} title="Состояние" />
        ),
        cell: ({ row }) => (
          <StatusBadge
            status={row.original.session_state ?? '—'}
            label={bgpSessionStateRu(row.original.session_state)}
          />
        ),
        meta: { headerTitle: 'Состояние' },
      },
      {
        id: 'actions',
        enableSorting: false,
        header: () => <span className="sr-only">Действия</span>,
        cell: ({ row }) => (
          <div className="flex items-center justify-end gap-1">
            <Button
              size="sm"
              type="button"
              variant="outline"
              onClick={() => {
                setApproveTarget(row.original)
                setName('')
                setSpeakerId(row.original.speaker_id ?? null)
              }}
            >
              <CheckIcon />
              Одобрить
            </Button>
            <Button
              size="sm"
              type="button"
              variant="ghost"
              onClick={() => setRejectTarget(row.original)}
            >
              <XIcon />
              Отклонить
            </Button>
          </div>
        ),
      },
    ],
    [],
  )

  function getFilterFieldValue(item: PeerDiscoveryRow, field: string): unknown {
    if (field === 'neighbor') {
      return `${item.neighbor_id ?? ''} ${item.neighbor}`
    }
    return undefined
  }

  async function confirmApprove() {
    if (!approveTarget) return
    await approveMutation.mutateAsync({
      id: approveTarget.id,
      body: {
        name: name.trim() || undefined,
        bgp_speaker_id: speakerId || null,
      },
    })
    setApproveTarget(null)
  }

  return (
    <>
      <ResourcePage
        title="На одобрение"
        description="Новые BGP-клиенты, подключившиеся к dynamic listener (карантин без export)"
        filterFields={filterFields}
        filterQuery={filterQuery}
        onFilterQueryChange={setFilterQuery}
        onClearFilters={() => setFilterQuery(createTextFilterQuery('neighbor'))}
        getFilterFieldValue={getFilterFieldValue}
        columns={columns}
        data={items}
        getRowId={(row) => row.id}
        isLoading={isLoading}
        isError={isError}
        error={error instanceof Error ? error : null}
        onRetry={onRetry}
        pinLastColumn
        emptyState={{
          title: 'Нет ожидающих пиров',
          description:
            'Включите peer discovery в параметрах BIRD и задайте CIDR-диапазоны. Новые сессии появятся здесь.',
        }}
      />

      <FormDrawer
        open={!!approveTarget}
        onOpenChange={(open) => {
          if (!open) setApproveTarget(null)
        }}
        title="Одобрить пира"
        description={
          approveTarget
            ? `ID соседа ${approveTarget.neighbor_id || '—'} · ${approveTarget.neighbor} AS${approveTarget.remote_asn ?? '?'}`
            : undefined
        }
        className="sm:max-w-sm"
        footer={
          <>
            <Button variant="outline" type="button" onClick={() => setApproveTarget(null)}>
              Отмена
            </Button>
            <LoadingButton
              type="button"
              loading={approveMutation.isPending}
              onClick={() => void confirmApprove()}
            >
              Одобрить
            </LoadingButton>
          </>
        }
      >
        <div className="flex flex-col gap-2">
          <Label htmlFor="disc-name">Имя (опционально)</Label>
          <Input
            id="disc-name"
            value={name}
            onChange={(e) => setName(e.target.value)}
            placeholder="client-edge-1"
          />
        </div>
        <SelectField
          id="disc-speaker"
          label="Спикер"
          items={speakerItems}
          value={speakerId ?? ''}
          onValueChange={(v) => setSpeakerId(v || null)}
          placeholder="Авто"
        />
      </FormDrawer>

      <ConfirmDialog
        open={!!rejectTarget}
        onOpenChange={(open) => {
          if (!open) setRejectTarget(null)
        }}
        title="Отклонить пира?"
        description={
          rejectTarget
            ? `${rejectTarget.neighbor_id || rejectTarget.neighbor} больше не будет появляться в списке.`
            : undefined
        }
        confirmLabel="Отклонить"
        destructive
        confirmLoading={rejectMutation.isPending}
        onConfirm={() => {
          if (!rejectTarget) return
          void rejectMutation.mutateAsync(rejectTarget.id).then(() => setRejectTarget(null))
        }}
      />
    </>
  )
}