"use client"

import { useEffect, useMemo, useState } from "react"
import { FormField, FormToggle, SectionTitle } from "@/components/form-kit"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import {
  Sheet, SheetContent, SheetHeader, SheetTitle,
  SheetDescription, SheetFooter, SheetClose,
} from "@/components/ui/sheet"
import { ChevronDownIcon, ChevronRightIcon } from "lucide-react"

export type WgCreateFormState = {
  serverId: string
  name: string
  listenPort: string
  mtu: string
  comment: string
  address: string
  enabled: boolean
  showAdvanced: boolean
  peerEnabled: boolean
  peerPublicKey: string
  peerAllowedIps: string
  peerEndpoint: string
  peerKeepalive: string
  peerComment: string
}

export const defaultWgCreateForm = (): WgCreateFormState => ({
  serverId: "",
  name: "",
  listenPort: "13231",
  mtu: "1420",
  comment: "",
  address: "",
  enabled: true,
  showAdvanced: false,
  peerEnabled: false,
  peerPublicKey: "",
  peerAllowedIps: "",
  peerEndpoint: "",
  peerKeepalive: "25",
  peerComment: "",
})

type ServerOption = { id: string; name: string; host: string }

function WgCreateSheet({
  open,
  onOpenChange,
  servers,
  busy,
  defaultServerId,
  onSubmit,
}: {
  open: boolean
  onOpenChange: (v: boolean) => void
  servers: ServerOption[]
  busy?: boolean
  defaultServerId?: string
  onSubmit: (form: WgCreateFormState) => void | Promise<void>
}) {
  const [form, setForm] = useState<WgCreateFormState>(defaultWgCreateForm)
  const set = <K extends keyof WgCreateFormState>(k: K, v: WgCreateFormState[K]) =>
    setForm((f) => ({ ...f, [k]: v }))

  useEffect(() => {
    if (!open) return
    setForm({ ...defaultWgCreateForm(), serverId: defaultServerId ?? "" })
  }, [open, defaultServerId])

  const canSubmit = useMemo(() => {
    return Boolean(form.serverId && form.name.trim() && form.listenPort)
  }, [form.serverId, form.name, form.listenPort])

  return (
    <Sheet open={open} onOpenChange={onOpenChange}>
      <SheetContent side="right" className="w-full sm:max-w-md flex flex-col gap-0 p-0">
        <SheetHeader className="px-6 pt-6 pb-4 border-b shrink-0">
          <SheetTitle>Быстрый туннель WireGuard</SheetTitle>
          <SheetDescription>
            Создать интерфейс на выбранном MikroTik (ключи сгенерирует RouterOS)
          </SheetDescription>
        </SheetHeader>

        <div className="flex-1 overflow-y-auto px-6 py-5 flex flex-col gap-5">
          <div className="flex flex-col gap-4">
            <SectionTitle>Основные</SectionTitle>
            <FormField label="Сервер" required>
              <select
                className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-xs outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]"
                value={form.serverId}
                onChange={(e) => set("serverId", e.target.value)}
              >
                <option value="">Выберите сервер…</option>
                {servers.map((s) => (
                  <option key={s.id} value={s.id}>
                    {s.name} ({s.host})
                  </option>
                ))}
              </select>
            </FormField>
            <FormField label="Имя интерфейса" required hint="Например wg-msk-spb">
              <Input
                className="font-mono"
                placeholder="wg0"
                value={form.name}
                onChange={(e) => set("name", e.target.value)}
              />
            </FormField>
            <div className="grid grid-cols-2 gap-3">
              <FormField label="Listen port" required>
                <Input
                  className="font-mono"
                  value={form.listenPort}
                  onChange={(e) => set("listenPort", e.target.value)}
                />
              </FormField>
              <FormField label="MTU">
                <Input
                  className="font-mono"
                  value={form.mtu}
                  onChange={(e) => set("mtu", e.target.value)}
                />
              </FormField>
            </div>
            <FormField label="Комментарий">
              <Input
                value={form.comment}
                onChange={(e) => set("comment", e.target.value)}
                placeholder="MSK → SPB overlay"
              />
            </FormField>
            <div className="flex items-center justify-between">
              <div>
                <p className="text-sm font-medium">Включён</p>
                <p className="text-xs text-muted-foreground">disabled=no на роутере</p>
              </div>
              <FormToggle checked={form.enabled} onChange={(v) => set("enabled", v)} />
            </div>
          </div>

          <button
            type="button"
            className="flex items-center gap-1.5 text-sm font-medium text-muted-foreground hover:text-foreground"
            onClick={() => set("showAdvanced", !form.showAdvanced)}
          >
            {form.showAdvanced ? <ChevronDownIcon className="size-4" /> : <ChevronRightIcon className="size-4" />}
            Дополнительно
          </button>

          {form.showAdvanced && (
            <div className="flex flex-col gap-4">
              <FormField label="IP на интерфейсе" hint="/ip address add, например 10.210.0.1/30">
                <Input
                  className="font-mono"
                  placeholder="10.210.0.1/30"
                  value={form.address}
                  onChange={(e) => set("address", e.target.value)}
                />
              </FormField>

              <div className="flex items-center justify-between">
                <div>
                  <p className="text-sm font-medium">Добавить первого пира</p>
                  <p className="text-xs text-muted-foreground">Сразу после создания интерфейса</p>
                </div>
                <FormToggle checked={form.peerEnabled} onChange={(v) => set("peerEnabled", v)} />
              </div>

              {form.peerEnabled && (
                <div className="flex flex-col gap-3 rounded-lg border border-border p-3">
                  <FormField label="Public key пира" required>
                    <Input
                      className="font-mono text-xs"
                      value={form.peerPublicKey}
                      onChange={(e) => set("peerPublicKey", e.target.value)}
                    />
                  </FormField>
                  <FormField label="Allowed IPs" required hint="Через запятую">
                    <Input
                      className="font-mono"
                      placeholder="10.210.0.2/32"
                      value={form.peerAllowedIps}
                      onChange={(e) => set("peerAllowedIps", e.target.value)}
                    />
                  </FormField>
                  <FormField label="Endpoint" hint="host:port">
                    <Input
                      className="font-mono"
                      placeholder="1.2.3.4:13231"
                      value={form.peerEndpoint}
                      onChange={(e) => set("peerEndpoint", e.target.value)}
                    />
                  </FormField>
                  <FormField label="Keepalive (сек)">
                    <Input
                      className="font-mono"
                      value={form.peerKeepalive}
                      onChange={(e) => set("peerKeepalive", e.target.value)}
                    />
                  </FormField>
                  <FormField label="Комментарий пира">
                    <Input
                      value={form.peerComment}
                      onChange={(e) => set("peerComment", e.target.value)}
                    />
                  </FormField>
                </div>
              )}
            </div>
          )}
        </div>

        <SheetFooter className="px-6 py-4 border-t shrink-0 flex-row gap-2">
          <SheetClose render={<Button variant="outline" className="flex-1" disabled={busy} />}>
            Отмена
          </SheetClose>
          <Button
            className="flex-1"
            disabled={!canSubmit || busy}
            onClick={() => void onSubmit(form)}
          >
            {busy ? "Создание…" : "Создать туннель"}
          </Button>
        </SheetFooter>
      </SheetContent>
    </Sheet>
  )
}

export { WgCreateSheet }