"use client"

import { useMemo, useState } from "react"
import { PageHeader } from "@/components/page-header"
import { routerContainers, servers } from "@/lib/data"
import type { RouterContainer } from "@/lib/data"
import { Flag } from "@/components/flag"
import { Card, CardContent } from "@/components/ui/card"
import { Button } from "@/components/ui/button"
import { cn } from "@/lib/utils"
import {
  DropdownMenu, DropdownMenuTrigger, DropdownMenuContent,
  DropdownMenuItem, DropdownMenuSeparator,
} from "@/components/ui/dropdown-menu"
import {
  BoxIcon, PlayIcon, StopCircleIcon, SearchIcon,
  MoreHorizontalIcon, Trash2Icon, PencilIcon, PowerIcon,
  CodeXmlIcon, CopyIcon, CheckIcon, ActivityIcon, ServerIcon,
  TerminalIcon, AlertCircleIcon,
} from "lucide-react"
import {
  Sheet, SheetContent, SheetHeader, SheetTitle,
  SheetDescription, SheetFooter, SheetClose,
} from "@/components/ui/sheet"

// ─── helpers ──────────────────────────────────────────────────────────────────

function serverFor(id: string) {
  return servers.find((s) => s.id === id)
}

function statusConfig(status: RouterContainer["status"]) {
  return {
    running: {
      dot: "bg-emerald-500 animate-pulse",
      badge: "bg-emerald-500/10 text-emerald-600 dark:text-emerald-400 border-emerald-500/20",
      label: "Running",
    },
    stopped: {
      dot: "bg-muted-foreground",
      badge: "bg-muted/50 text-muted-foreground border-border",
      label: "Stopped",
    },
    error: {
      dot: "bg-red-500 animate-pulse",
      badge: "bg-red-500/10 text-red-600 dark:text-red-400 border-red-500/20",
      label: "Error",
    },
  }[status]
}

// ─── RSC generator ────────────────────────────────────────────────────────────

function generateContainerRsc(c: RouterContainer): string {
  const srv = serverFor(c.serverId)
  const lines: string[] = []
  lines.push(`# RouterOS Container — ${c.name}`)
  if (srv) lines.push(`# Сервер: ${srv.name} (${srv.host})`)
  lines.push(`# Образ: ${c.image}:${c.tag}`)
  lines.push(`# RouterOS 7.4+ · /container`)
  lines.push(``)

  // interface
  for (const iface of c.interfaces) {
    lines.push(`/interface/veth/add name=${iface} address=172.17.0.2/24 gateway=172.17.0.1`)
  }
  lines.push(``)

  // envs
  if (c.envs.length > 0) {
    lines.push(`/container/envs/add name=${c.name}-envs \\`)
    for (const { key, value } of c.envs) {
      lines.push(`  ${key}="${value}" \\`)
    }
    lines.push(``)
  }

  // mounts
  for (const m of c.mounts) {
    lines.push(`/container/mounts/add name=${c.name}-mount-${m.dst.replace(/\//g, "-").slice(1)} \\`)
    if (m.src) lines.push(`  src=${m.src} \\`)
    lines.push(`  dst=${m.dst}`)
    lines.push(``)
  }

  // container
  lines.push(`/container/add \\`)
  lines.push(`  remote-image=${c.image}:${c.tag} \\`)
  lines.push(`  interface=${c.interfaces[0] ?? "veth-container"} \\`)
  if (c.envs.length > 0) lines.push(`  envlist=${c.name}-envs \\`)
  if (c.mounts.length > 0) lines.push(`  mounts=${c.mounts.map((m) => `${c.name}-mount-${m.dst.replace(/\//g, "-").slice(1)}`).join(",")} \\`)
  if (c.cmd) lines.push(`  cmd="${c.cmd}" \\`)
  if (c.startOnBoot) lines.push(`  start-on-boot=yes \\`)
  if (c.comment) lines.push(`  comment="${c.comment}" \\`)
  lines.push(`  logging=yes`)

  return lines.join("\n")
}

// ─── Export Sheet ─────────────────────────────────────────────────────────────

function ExportSheet({ open, container, onClose }: {
  open: boolean; container: RouterContainer | null; onClose: () => void
}) {
  const [copied, setCopied] = useState(false)
  const code = useMemo(() => container ? generateContainerRsc(container) : "", [container])

  function handleCopy() {
    navigator.clipboard.writeText(code).then(() => {
      setCopied(true); setTimeout(() => setCopied(false), 2000)
    })
  }

  return (
    <Sheet open={open} onOpenChange={(v) => { if (!v) onClose() }}>
      <SheetContent className="flex flex-col overflow-hidden p-0 gap-0 sm:max-w-2xl">
        <SheetHeader className="shrink-0 px-6 pt-5 pb-4 border-b">
          <div className="flex items-start justify-between gap-4">
            <div>
              <SheetTitle>Экспорт Container</SheetTitle>
              <SheetDescription>RouterOS 7.4+ · /container · /interface/veth</SheetDescription>
            </div>
            <Button variant="outline" size="sm" className="shrink-0" onClick={handleCopy}>
              {copied ? <><CheckIcon className="size-3.5 text-emerald-500" />Скопировано</> : <><CopyIcon className="size-3.5" />Копировать</>}
            </Button>
          </div>
        </SheetHeader>
        <div className="flex-1 overflow-y-auto">
          <pre className="px-6 py-5 text-[12px] font-mono leading-relaxed text-foreground/85 whitespace-pre select-all">
            {code.split("\n").map((line, i) => {
              const isComment = line.startsWith("#")
              const isCmd = /^\//.test(line.trimStart())
              const isParam = /^\s+[a-z]/.test(line)
              return (
                <span key={i} className={
                  isComment ? "text-muted-foreground"
                  : isCmd    ? "text-sky-400"
                  : isParam  ? "text-violet-300"
                  : "text-foreground"
                }>
                  {line}{"\n"}
                </span>
              )
            })}
          </pre>
        </div>
        <SheetFooter className="shrink-0 px-6 py-4 border-t flex-row gap-2">
          <SheetClose render={<Button variant="outline" className="flex-1" />}>Закрыть</SheetClose>
          <Button className="flex-1" onClick={handleCopy}>
            {copied ? <CheckIcon className="size-4" /> : <CopyIcon className="size-4" />}
            {copied ? "Скопировано" : "Копировать .rsc"}
          </Button>
        </SheetFooter>
      </SheetContent>
    </Sheet>
  )
}

// ─── Container card ───────────────────────────────────────────────────────────

function ContainerCard({
  container,
  onExport,
}: {
  container: RouterContainer
  onExport: () => void
}) {
  const srv = serverFor(container.serverId)
  const cfg = statusConfig(container.status)

  return (
    <Card className="overflow-hidden">
      <div className="px-4 py-3 border-b flex items-center justify-between gap-2 bg-muted/10">
        <div className="flex items-center gap-2 min-w-0">
          <span className={cn("size-2 rounded-full shrink-0", cfg.dot)} />
          <span className="font-mono font-semibold text-sm truncate">{container.name}</span>
          <span className={cn("text-[10px] font-mono px-1.5 py-0.5 rounded border shrink-0", cfg.badge)}>
            {cfg.label}
          </span>
        </div>
        <DropdownMenu>
          <DropdownMenuTrigger render={
            <Button variant="ghost" size="icon" className="size-7 shrink-0">
              <MoreHorizontalIcon className="size-4" />
            </Button>
          } />
          <DropdownMenuContent side="bottom" align="end">
            {container.status === "running" ? (
              <DropdownMenuItem><StopCircleIcon className="size-4 text-amber-500" />Остановить</DropdownMenuItem>
            ) : (
              <DropdownMenuItem><PlayIcon className="size-4 text-emerald-500" />Запустить</DropdownMenuItem>
            )}
            <DropdownMenuItem><TerminalIcon className="size-4" />Логи</DropdownMenuItem>
            <DropdownMenuItem><PencilIcon className="size-4" />Редактировать</DropdownMenuItem>
            <DropdownMenuItem onClick={onExport}><CodeXmlIcon className="size-4" />Экспорт .rsc</DropdownMenuItem>
            <DropdownMenuSeparator />
            <DropdownMenuItem><PowerIcon className="size-4" />Перезапустить</DropdownMenuItem>
            <DropdownMenuSeparator />
            <DropdownMenuItem variant="destructive"><Trash2Icon className="size-4" />Удалить</DropdownMenuItem>
          </DropdownMenuContent>
        </DropdownMenu>
      </div>

      <CardContent className="px-4 py-3 flex flex-col gap-3">
        {/* image */}
        <div className="flex items-center gap-2">
          <BoxIcon className="size-3.5 text-muted-foreground shrink-0" />
          <span className="font-mono text-xs text-foreground/80">
            {container.image}:<span className="text-muted-foreground">{container.tag}</span>
          </span>
        </div>

        {/* server */}
        {srv && (
          <div className="flex items-center gap-2 text-xs text-muted-foreground">
            <ServerIcon className="size-3.5 shrink-0" />
            <Flag code={srv.country} size={12} />
            <span className="font-mono">{srv.name}</span>
          </div>
        )}

        {/* uptime + stats */}
        {container.status === "running" && (
          <div className="flex items-center gap-4 text-xs text-muted-foreground border-t pt-2.5">
            {container.uptime && (
              <div className="flex items-center gap-1">
                <ActivityIcon className="size-3 text-emerald-500" />
                <span>{container.uptime}</span>
              </div>
            )}
            {container.cpu !== undefined && (
              <div>
                <span className="text-muted-foreground">CPU </span>
                <span className={cn("font-mono font-medium",
                  container.cpu > 50 ? "text-amber-500" : "text-foreground")}>
                  {container.cpu}%
                </span>
              </div>
            )}
            {container.memMb !== undefined && (
              <div>
                <span className="text-muted-foreground">RAM </span>
                <span className="font-mono font-medium">{container.memMb} МБ</span>
              </div>
            )}
          </div>
        )}

        {/* interfaces */}
        {container.interfaces.length > 0 && (
          <div className="flex flex-wrap gap-1">
            {container.interfaces.map((i) => (
              <span key={i} className="text-[10px] font-mono px-1.5 py-0.5 bg-muted border rounded text-muted-foreground">
                {i}
              </span>
            ))}
          </div>
        )}

        {/* mounts */}
        {container.mounts.length > 0 && (
          <div className="flex flex-col gap-1">
            {container.mounts.map((m, idx) => (
              <div key={idx} className="text-[11px] font-mono text-muted-foreground flex items-center gap-1">
                <span className="text-muted-foreground/40">→</span>
                <span>{m.dst}</span>
                {m.src && <><span className="text-muted-foreground/40">←</span><span>{m.src}</span></>}
              </div>
            ))}
          </div>
        )}

        {container.comment && (
          <p className="text-xs text-muted-foreground border-t pt-2">{container.comment}</p>
        )}
      </CardContent>
    </Card>
  )
}

// ════════════════════════════════════════════════════════════════════════════
export default function ContainersPage() {
  const [search, setSearch]               = useState("")
  const [statusFilter, setStatusFilter]   = useState<RouterContainer["status"] | "all">("all")
  const [exportContainer, setExportContainer] = useState<RouterContainer | null>(null)

  const filtered = useMemo(() => {
    return routerContainers.filter((c) => {
      if (statusFilter !== "all" && c.status !== statusFilter) return false
      if (!search) return true
      const q = search.toLowerCase()
      return (
        c.name.toLowerCase().includes(q) ||
        c.image.toLowerCase().includes(q) ||
        (serverFor(c.serverId)?.name.toLowerCase().includes(q) ?? false)
      )
    })
  }, [search, statusFilter])

  const running = routerContainers.filter((c) => c.status === "running").length
  const stopped = routerContainers.filter((c) => c.status === "stopped").length
  const errors  = routerContainers.filter((c) => c.status === "error").length

  return (
    <div className="flex flex-col h-full">
      <PageHeader
        crumbs={[{ label: "Управление" }, { label: "Контейнеры" }]}
        actions={
          <Button size="sm">
            <BoxIcon className="size-4" />Новый контейнер
          </Button>
        }
      />

      <div className="flex-1 overflow-y-auto p-6">
        <div className="flex flex-col gap-5">

          {/* KPI */}
          <div className="grid grid-cols-2 lg:grid-cols-4 gap-4">
            {[
              { label: "Всего",    value: routerContainers.length, icon: <BoxIcon className="size-4 text-muted-foreground" /> },
              { label: "Running",  value: running,                 icon: <PlayIcon className="size-4 text-emerald-500" /> },
              { label: "Stopped",  value: stopped,                 icon: <StopCircleIcon className="size-4 text-muted-foreground" /> },
              { label: "Ошибок",   value: errors,                  icon: <AlertCircleIcon className="size-4 text-red-500" /> },
            ].map((s) => (
              <Card key={s.label}>
                <CardContent className="px-5 py-4 flex items-start justify-between">
                  <div>
                    <p className="text-sm text-muted-foreground">{s.label}</p>
                    <p className="text-2xl font-semibold tabular-nums mt-0.5">{s.value}</p>
                  </div>
                  <div className="mt-0.5">{s.icon}</div>
                </CardContent>
              </Card>
            ))}
          </div>

          {/* Info banner */}
          <div className="flex items-start gap-3 rounded-lg bg-violet-500/5 border border-violet-500/20 px-4 py-3 text-sm">
            <BoxIcon className="size-5 text-violet-500 shrink-0 mt-0.5" />
            <div>
              <p className="font-medium text-violet-600 dark:text-violet-400">Контейнеры доступны с RouterOS 7.4+</p>
              <p className="text-muted-foreground text-xs mt-0.5">
                Поддерживаются Docker-совместимые образы. Требуется установка пакета <code className="font-mono bg-muted px-1 rounded">container</code>.
                Интерфейсы veth создаются автоматически.
              </p>
            </div>
          </div>

          {/* Toolbar */}
          <div className="flex items-center gap-3 flex-wrap">
            <div className="flex items-center gap-2 h-8 px-3 border border-input rounded-md bg-background min-w-[240px]">
              <SearchIcon className="size-3.5 text-muted-foreground shrink-0" />
              <input
                className="flex-1 bg-transparent outline-none placeholder:text-muted-foreground text-sm"
                placeholder="Поиск по имени, образу, серверу…"
                value={search}
                onChange={(e) => setSearch(e.target.value)}
              />
            </div>

            <div className="flex items-center gap-1 rounded-md border border-border bg-muted/40 p-0.5">
              {(["all", "running", "stopped", "error"] as const).map((s) => (
                <button key={s}
                  onClick={() => setStatusFilter(s)}
                  className={cn(
                    "px-3 py-1 text-xs rounded whitespace-nowrap transition-colors",
                    statusFilter === s
                      ? "bg-background text-foreground shadow-sm"
                      : "text-muted-foreground hover:text-foreground",
                  )}>
                  {s === "all" ? "Все" : s === "running" ? "Running" : s === "stopped" ? "Stopped" : "Error"}
                </button>
              ))}
            </div>

            <span className="text-sm text-muted-foreground ml-auto">{filtered.length} контейнеров</span>
          </div>

          {/* Grid */}
          {filtered.length === 0 ? (
            <div className="flex flex-col items-center justify-center py-16 text-center text-muted-foreground">
              <BoxIcon className="size-10 mb-3 opacity-20" />
              <p className="text-sm font-medium">Контейнеры не найдены</p>
              <p className="text-xs mt-1">Добавьте первый контейнер или измените фильтр</p>
            </div>
          ) : (
            <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-4">
              {filtered.map((c) => (
                <ContainerCard
                  key={c.id}
                  container={c}
                  onExport={() => setExportContainer(c)}
                />
              ))}
            </div>
          )}

          {/* RouterOS reference */}
          <Card>
            <CardContent className="px-5 py-4">
              <p className="text-xs font-medium text-muted-foreground mb-3">
                RouterOS 7.4+ · /container — быстрые команды
              </p>
              <div className="grid grid-cols-1 sm:grid-cols-3 gap-4 text-xs font-mono">
                {[
                  {
                    title: "Установка пакета",
                    lines: [
                      "# Скачать пакет container:",
                      "# mikrotik.com → Software",
                      "",
                      "/system/package/install",
                      "  container",
                      "",
                      "# Перезагрузить:",
                      "/system/reboot",
                    ],
                  },
                  {
                    title: "Создать контейнер",
                    lines: [
                      "# veth интерфейс:",
                      "/interface/veth/add \\",
                      "  name=veth-nginx \\",
                      "  address=172.17.0.2/24 \\",
                      "  gateway=172.17.0.1",
                      "",
                      "# Контейнер:",
                      "/container/add \\",
                      "  remote-image=nginx:alpine \\",
                      "  interface=veth-nginx",
                    ],
                  },
                  {
                    title: "Управление",
                    lines: [
                      "# Список:",
                      "/container/print",
                      "",
                      "# Запуск:",
                      "/container/start 0",
                      "",
                      "# Остановка:",
                      "/container/stop 0",
                      "",
                      "# Логи:",
                      "/container/shell 0",
                    ],
                  },
                ].map((b) => (
                  <div key={b.title}>
                    <p className="font-sans font-semibold text-foreground/80 mb-1.5 text-[11px] uppercase tracking-wide">{b.title}</p>
                    <pre className="bg-zinc-950 rounded-md p-2.5 text-zinc-300 text-[11px] leading-relaxed overflow-x-auto whitespace-pre">
                      {b.lines.join("\n")}
                    </pre>
                  </div>
                ))}
              </div>
            </CardContent>
          </Card>

        </div>
      </div>

      <ExportSheet
        open={!!exportContainer}
        container={exportContainer}
        onClose={() => setExportContainer(null)}
      />
    </div>
  )
}