"use client"

import { useState, useMemo, useEffect } from "react"
import { PageHeader } from "@/components/page-header"
import { DataPageCard } from "@/components/data-page-card"
import {
  CommunitiesDataGrid,
  type CommunityRow,
  TYPE_LABELS,
  ACTION_LABELS,
  ACTION_COLOR,
} from "@/components/data-grids/communities-data-grid"
import {
  Card, CardContent, CardHeader, CardTitle, CardDescription,
} from "@/components/ui/card"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import {
  PlusIcon, SearchIcon, TagIcon, FilterIcon,
  CopyIcon, CheckIcon, TrashIcon, PencilIcon,
  LoaderCircleIcon,
} from "lucide-react"
import { cn } from "@/lib/utils"
import { filters } from "@/lib/data"
import { useDataSource } from "@/lib/data-source"
import { useEvoBGP } from "@/lib/evobgp-context"

// ─── types ────────────────────────────────────────────────────────────────────

type Community = CommunityRow
type CommType = CommunityRow["type"]

// ─── mock data ────────────────────────────────────────────────────────────────

const COMMUNITIES: Community[] = [
  {
    id: "c1", value: "65001:100", name: "youtube-bypass",
    description: "Пометка для трафика YouTube — маршрутизация через SPB/FRA exit nodes",
    type: "standard", filterIds: ["f1"], serverCount: 4, prefixCount: 842,
    action: "local-pref", actionValue: 200, enabled: true,
  },
  {
    id: "c2", value: "65001:200", name: "streaming-eu",
    description: "EU-стриминг (Netflix, Twitch) — выход через FRA/AMS",
    type: "standard", filterIds: ["f1", "f2"], serverCount: 3, prefixCount: 614,
    action: "local-pref", actionValue: 180, enabled: true,
  },
  {
    id: "c3", value: "65001:300", name: "cdn-bypass",
    description: "Обход CDN-провайдеров через прямые пиринговые IX-точки",
    type: "standard", filterIds: ["f3"], serverCount: 5, prefixCount: 4218,
    action: "local-pref", actionValue: 210, enabled: true,
  },
  {
    id: "c4", value: "65002:100", name: "cdn-secondary",
    description: "Резервный CDN-путь при деградации основного",
    type: "standard", filterIds: ["f3"], serverCount: 5, prefixCount: 1842,
    action: "metric", actionValue: 50, enabled: true,
  },
  {
    id: "c5", value: "65001:400", name: "office-direct",
    description: "Office 365 / Teams — прямой выход без туннелирования",
    type: "standard", filterIds: ["f5"], serverCount: 6, prefixCount: 882,
    action: "permit", enabled: true,
  },
  {
    id: "c6", value: "65001:500", name: "gaming-ll",
    description: "Low-latency gaming — приоритет по минимальному RTT (Discord, Steam)",
    type: "standard", filterIds: ["f6"], serverCount: 4, prefixCount: 1212,
    action: "local-pref", actionValue: 250, enabled: true,
  },
  {
    id: "c7", value: "65002:200", name: "gaming-ll-backup",
    description: "Резервный путь для gaming-low-latency",
    type: "standard", filterIds: ["f6"], serverCount: 4, prefixCount: 412,
    action: "metric", actionValue: 80, enabled: true,
  },
  {
    id: "c8", value: "65007:999", name: "school-block",
    description: "Блокировка соцсетей для школьного сегмента LAN",
    type: "standard", filterIds: ["f4"], serverCount: 2, prefixCount: 412,
    action: "deny", enabled: false,
  },
  {
    id: "c9", value: "no-export", name: "no-export",
    description: "Не объявлять маршрут за пределы AS (RFC 1997)",
    type: "no-export", filterIds: [], serverCount: 1, prefixCount: 0,
    action: "permit", enabled: true,
  },
  {
    id: "c10", value: "no-advertise", name: "no-advertise",
    description: "Не передавать маршрут ни одному BGP-пиру (RFC 1997)",
    type: "no-advertise", filterIds: [], serverCount: 1, prefixCount: 0,
    action: "permit", enabled: true,
  },
]

// ─── page ─────────────────────────────────────────────────────────────────────

export default function CommunitiesPage() {
  const { mode } = useDataSource()
  const { enabled, snapshot, loading, error } = useEvoBGP()
  const useEvoCatalog = mode === "live" && enabled

  const [search, setSearch] = useState("")
  const [typeFilter, setTypeFilter] = useState<CommType | "all">("all")
  const [copied, setCopied] = useState<string | null>(null)
  const [selected, setSelected] = useState<Community | null>(null)

  const listData = useMemo((): Community[] => {
    if (!useEvoCatalog) return COMMUNITIES
    if (loading && !snapshot) return []
    return snapshot?.communities ?? []
  }, [useEvoCatalog, loading, snapshot])

  useEffect(() => {
    setSelected(null)
  }, [useEvoCatalog])

  const filtered = useMemo(() => {
    const q = search.toLowerCase()
    return listData.filter(c => {
      const matchQ = !q || c.value.toLowerCase().includes(q) || c.name.toLowerCase().includes(q) || c.description.toLowerCase().includes(q)
      const matchT = typeFilter === "all" || c.type === typeFilter
      return matchQ && matchT
    })
  }, [search, typeFilter, listData])

  const handleCopy = (value: string) => {
    navigator.clipboard.writeText(value).catch(() => {})
    setCopied(value)
    setTimeout(() => setCopied(null), 1500)
  }

  const filterName = (id: string) => filters.find(f => f.id === id)?.name ?? id

  return (
    <div className="flex flex-col h-full">
      <PageHeader
        crumbs={[{ label: "Данные" }, { label: "Communities" }]}
        actions={
          <Button size="sm">
            <PlusIcon className="size-4" />Добавить
          </Button>
        }
      />

      <div className="flex-1 overflow-y-auto p-6">
        <div className="flex flex-col gap-5">
          {useEvoCatalog && (
            <p className={cn(
              "text-xs flex items-center gap-1.5 -mt-1",
              error ? "text-destructive" : "text-muted-foreground",
            )}>
              {loading && <LoaderCircleIcon className="size-3.5 animate-spin shrink-0" />}
              {error
                ? `EvoBGP: ${error}`
                : snapshot?.fetchedAt
                  ? `Источник: EvoBGP, обновлено ${new Date(snapshot.fetchedAt).toLocaleString("ru-RU")}`
                  : loading ? "Загрузка EvoBGP…" : "EvoBGP"}
            </p>
          )}

          {/* ── summary ── */}
          <div className="grid grid-cols-2 sm:grid-cols-4 gap-3">
            {[
              { label: "Всего communities", value: String(listData.length) },
              { label: "Активных",          value: String(listData.filter(c => c.enabled).length) },
              { label: "Стандартных",       value: String(listData.filter(c => c.type === "standard").length) },
              { label: "Использует фильтры",value: String(new Set(listData.flatMap(c => c.filterIds)).size) },
            ].map(({ label, value }) => (
              <Card key={label}>
                <CardContent className="pt-4 pb-3 px-4">
                  <p className="text-xs text-muted-foreground">{label}</p>
                  <p className="text-2xl font-semibold tabular-nums">{value}</p>
                </CardContent>
              </Card>
            ))}
          </div>

          <div className="grid grid-cols-[1fr_320px] gap-5">
            {/* ── main table ── */}
            <div className="flex flex-col gap-3">
              {/* toolbar */}
              <div className="flex gap-2 flex-wrap">
                <div className="relative flex-1 min-w-[180px]">
                  <SearchIcon className="absolute left-2.5 top-2 size-4 text-muted-foreground" />
                  <Input className="pl-8 h-8 text-sm" placeholder="Поиск community…" value={search} onChange={e => setSearch(e.target.value)} />
                </div>
                <div className="flex gap-1">
                  {(["all", "standard", "no-export", "no-advertise", "custom"] as const).map(t => (
                    <Button key={t} size="sm" variant={typeFilter === t ? "default" : "outline"}
                      className="h-8 text-xs px-2.5" onClick={() => setTypeFilter(t)}>
                      {t === "all" ? "Все" : TYPE_LABELS[t] ?? t}
                    </Button>
                  ))}
                </div>
              </div>

              {/* list */}
              <DataPageCard>
                <CommunitiesDataGrid
                  communities={filtered}
                  selectedId={selected?.id}
                  copiedValue={copied}
                  onSelect={setSelected}
                  onCopy={handleCopy}
                />
              </DataPageCard>
            </div>

            {/* ── detail panel ── */}
            {selected ? (
              <Card className="h-fit sticky top-0">
                <CardHeader className="pb-3">
                  <div className="flex items-start justify-between gap-2">
                    <div>
                      <div className="flex items-center gap-2 mb-1">
                        <span className={cn(
                          "inline-flex items-center rounded-full px-2 py-0.5 text-[10px] font-medium",
                          selected.enabled
                            ? "bg-emerald-500/10 text-emerald-600"
                            : "bg-muted text-muted-foreground"
                        )}>
                          {selected.enabled ? "Активен" : "Выключен"}
                        </span>
                      </div>
                      <CardTitle className="text-sm font-mono">{selected.value}</CardTitle>
                      <CardDescription className="text-xs mt-0.5">{selected.name}</CardDescription>
                    </div>
                    <div className="flex gap-1 shrink-0">
                      <Button size="sm" variant="ghost" className="size-7 p-0"><PencilIcon className="size-3.5" /></Button>
                      <Button size="sm" variant="ghost" className="size-7 p-0 text-destructive hover:text-destructive"><TrashIcon className="size-3.5" /></Button>
                    </div>
                  </div>
                </CardHeader>
                <CardContent className="space-y-4 text-sm">
                  <p className="text-xs text-muted-foreground">{selected.description}</p>

                  <div className="space-y-2">
                    {[
                      ["Тип",       TYPE_LABELS[selected.type]],
                      ["Действие",  `${ACTION_LABELS[selected.action]}${selected.actionValue !== undefined ? ` ${selected.actionValue}` : ""}`],
                      ["Маршрутов", selected.prefixCount.toLocaleString("ru-RU")],
                      ["Серверов",  selected.serverCount.toLocaleString("ru-RU")],
                    ].map(([k, v]) => (
                      <div key={k} className="flex justify-between gap-2">
                        <span className="text-xs text-muted-foreground">{k}</span>
                        <span className="text-xs font-medium">{v}</span>
                      </div>
                    ))}
                  </div>

                  {selected.filterIds.length > 0 && (
                    <div>
                      <p className="text-xs text-muted-foreground mb-2 flex items-center gap-1.5">
                        <FilterIcon className="size-3" />Использующие фильтры
                      </p>
                      <div className="flex flex-wrap gap-1.5">
                        {selected.filterIds.map(fid => (
                          <span key={fid} className="text-[11px] bg-muted px-2 py-0.5 rounded font-mono">
                            {filterName(fid)}
                          </span>
                        ))}
                      </div>
                    </div>
                  )}

                  <div className="pt-2 border-t flex flex-col gap-2">
                    <Button size="sm" variant="outline" className="w-full justify-start gap-2" onClick={() => handleCopy(selected.value)}>
                      {copied === selected.value ? <CheckIcon className="size-3.5" /> : <CopyIcon className="size-3.5" />}
                      Скопировать значение
                    </Button>
                  </div>
                </CardContent>
              </Card>
            ) : (
              <Card className="h-fit">
                <CardContent className="flex flex-col items-center justify-center py-12 gap-3 text-center">
                  <TagIcon className="size-8 text-muted-foreground/30" />
                  <p className="text-xs text-muted-foreground">Выберите community<br />для просмотра деталей</p>
                </CardContent>
              </Card>
            )}
          </div>
        </div>
      </div>
    </div>
  )
}
