"use client"

import { useState, useMemo } from "react"
import { PageHeader } from "@/components/page-header"
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, ServerIcon, FilterIcon,
  ChevronRightIcon, CopyIcon, CheckIcon, TrashIcon, PencilIcon,
} from "lucide-react"
import { cn } from "@/lib/utils"
import { filters } from "@/lib/data"

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

type CommType = "standard" | "no-export" | "no-advertise" | "local-as" | "custom"

interface Community {
  id: string
  value: string          // e.g. "65001:100"
  name: string
  description: string
  type: CommType
  filterIds: string[]    // which filters use this community
  serverCount: number
  prefixCount: number
  action: "permit" | "deny" | "local-pref" | "metric"
  actionValue?: number   // e.g. local-pref value
  enabled: boolean
}

// ─── 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,
  },
]

const TYPE_LABELS: Record<CommType, string> = {
  "standard":    "Стандартный",
  "no-export":   "No-export",
  "no-advertise":"No-advertise",
  "local-as":    "Local-AS",
  "custom":      "Кастомный",
}

const ACTION_LABELS: Record<Community["action"], string> = {
  "permit":     "Permit",
  "deny":       "Deny",
  "local-pref": "Local-pref",
  "metric":     "MED/Metric",
}

const ACTION_COLOR: Record<Community["action"], string> = {
  "permit":     "text-emerald-500",
  "deny":       "text-red-500",
  "local-pref": "text-blue-500",
  "metric":     "text-amber-500",
}

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

export default function CommunitiesPage() {
  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 filtered = useMemo(() => {
    const q = search.toLowerCase()
    return COMMUNITIES.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])

  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">

          {/* ── summary ── */}
          <div className="grid grid-cols-2 sm:grid-cols-4 gap-3">
            {[
              { label: "Всего communities", value: String(COMMUNITIES.length) },
              { label: "Активных",          value: String(COMMUNITIES.filter(c => c.enabled).length) },
              { label: "Стандартных",       value: String(COMMUNITIES.filter(c => c.type === "standard").length) },
              { label: "Использует фильтры",value: String(new Set(COMMUNITIES.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 */}
              <Card className="overflow-hidden">
                <div className="overflow-x-auto">
                  <table className="w-full text-sm">
                    <thead>
                      <tr className="border-b text-xs text-muted-foreground">
                        <th className="text-left font-medium px-4 py-2.5">Community</th>
                        <th className="text-left font-medium px-4 py-2.5">Имя / описание</th>
                        <th className="text-left font-medium px-4 py-2.5">Тип</th>
                        <th className="text-left font-medium px-4 py-2.5">Действие</th>
                        <th className="text-right font-medium px-4 py-2.5">Маршрутов</th>
                        <th className="text-right font-medium px-4 py-2.5">Серверов</th>
                        <th className="px-4 py-2.5" />
                      </tr>
                    </thead>
                    <tbody>
                      {filtered.map(c => (
                        <tr
                          key={c.id}
                          onClick={() => setSelected(c)}
                          className={cn(
                            "border-b last:border-0 cursor-pointer hover:bg-muted/40 transition-colors",
                            selected?.id === c.id && "bg-primary/5",
                            !c.enabled && "opacity-50",
                          )}
                        >
                          <td className="px-4 py-2.5">
                            <div className="flex items-center gap-2">
                              <TagIcon className="size-3.5 text-muted-foreground shrink-0" />
                              <span className="font-mono text-xs font-medium bg-muted px-1.5 py-0.5 rounded">
                                {c.value}
                              </span>
                              <button
                                onClick={e => { e.stopPropagation(); handleCopy(c.value) }}
                                className="text-muted-foreground/40 hover:text-muted-foreground transition-colors"
                              >
                                {copied === c.value
                                  ? <CheckIcon className="size-3" />
                                  : <CopyIcon className="size-3" />
                                }
                              </button>
                            </div>
                          </td>
                          <td className="px-4 py-2.5">
                            <p className="font-medium text-xs">{c.name}</p>
                            <p className="text-xs text-muted-foreground line-clamp-1">{c.description}</p>
                          </td>
                          <td className="px-4 py-2.5">
                            <span className="text-xs text-muted-foreground">{TYPE_LABELS[c.type]}</span>
                          </td>
                          <td className="px-4 py-2.5">
                            <span className={cn("text-xs font-medium", ACTION_COLOR[c.action])}>
                              {ACTION_LABELS[c.action]}{c.actionValue !== undefined ? ` ${c.actionValue}` : ""}
                            </span>
                          </td>
                          <td className="px-4 py-2.5 text-right font-mono text-xs">
                            {c.prefixCount > 0 ? c.prefixCount.toLocaleString() : "—"}
                          </td>
                          <td className="px-4 py-2.5 text-right">
                            <div className="flex items-center justify-end gap-1">
                              <ServerIcon className="size-3 text-muted-foreground" />
                              <span className="font-mono text-xs">{c.serverCount}</span>
                            </div>
                          </td>
                          <td className="px-4 py-2.5">
                            <ChevronRightIcon className="size-4 text-muted-foreground/40" />
                          </td>
                        </tr>
                      ))}
                    </tbody>
                  </table>
                  {filtered.length === 0 && (
                    <div className="flex flex-col items-center justify-center py-16 gap-2 text-muted-foreground">
                      <TagIcon className="size-8 opacity-30" />
                      <p className="text-sm">Ничего не найдено</p>
                    </div>
                  )}
                </div>
              </Card>
            </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 > 0 ? selected.prefixCount.toLocaleString() : "—"],
                      ["Серверов",  String(selected.serverCount)],
                    ].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>
  )
}
