"use client"

import { useState } from "react"
import { useRouter } from "next/navigation"
import { toast } from "sonner"
import {
  Check,
  Copy,
  Eye,
  EyeOff,
  Loader2,
  Plus,
  Power,
  RefreshCw,
  Send,
  Trash2,
  Webhook,
} from "lucide-react"
import { WEBHOOK_EVENTS } from "@/lib/webhooks/events"
import {
  createWebhookEndpoint,
  deleteWebhookEndpoint,
  rotateWebhookSecret,
  sendTestWebhook,
  updateWebhookEndpoint,
  type WebhookEndpointDTO,
} from "@/app/actions/webhooks"

const inputClass =
  "w-full rounded-lg border border-white/10 bg-white/5 px-4 py-2.5 text-sm text-white placeholder-white/30 outline-none ring-indigo-500 transition focus:border-indigo-500/50 focus:ring-1"

function formatDate(value: string | null): string {
  if (!value) return "Never"
  const d = new Date(value)
  return Number.isNaN(d.getTime())
    ? "—"
    : d.toLocaleString(undefined, { month: "short", day: "numeric", hour: "2-digit", minute: "2-digit" })
}

function eventsSummary(events: string[]): string {
  if (events.length === 0) return "All events"
  if (events.length === 1) return events[0]
  return `${events.length} events`
}

function SecretField({ secret }: { secret: string }) {
  const [shown, setShown] = useState(false)
  const [copied, setCopied] = useState(false)

  async function copy() {
    try {
      await navigator.clipboard.writeText(secret)
      setCopied(true)
      toast.success("Signing secret copied")
      setTimeout(() => setCopied(false), 2000)
    } catch {
      toast.error("Copy failed — reveal and copy manually")
    }
  }

  return (
    <div className="flex items-center gap-2">
      <code className="min-w-0 flex-1 truncate rounded-lg border border-white/10 bg-[#0a0a12] px-3 py-2 font-mono text-xs text-emerald-300">
        {shown ? secret : "whsec_" + "•".repeat(24)}
      </code>
      <button
        type="button"
        onClick={() => setShown((s) => !s)}
        title={shown ? "Hide" : "Reveal"}
        className="shrink-0 rounded-lg border border-white/10 p-2 text-white/50 transition hover:bg-white/5 hover:text-white"
      >
        {shown ? <EyeOff className="h-3.5 w-3.5" /> : <Eye className="h-3.5 w-3.5" />}
      </button>
      <button
        type="button"
        onClick={copy}
        title="Copy"
        className="shrink-0 rounded-lg border border-white/10 p-2 text-white/50 transition hover:bg-white/5 hover:text-white"
      >
        {copied ? <Check className="h-3.5 w-3.5 text-emerald-400" /> : <Copy className="h-3.5 w-3.5" />}
      </button>
    </div>
  )
}

export function WebhookManager({ initialEndpoints }: { initialEndpoints: WebhookEndpointDTO[] }) {
  const router = useRouter()
  const [url, setUrl] = useState("")
  const [description, setDescription] = useState("")
  const [allEvents, setAllEvents] = useState(true)
  const [selected, setSelected] = useState<Set<string>>(new Set())
  const [creating, setCreating] = useState(false)
  const [busyId, setBusyId] = useState<string | null>(null)

  function toggleEvent(id: string) {
    setSelected((prev) => {
      const next = new Set(prev)
      if (next.has(id)) next.delete(id)
      else next.add(id)
      return next
    })
  }

  async function handleCreate(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault()
    const trimmed = url.trim()
    if (!trimmed) return
    setCreating(true)
    try {
      await createWebhookEndpoint({
        url: trimmed,
        description: description.trim() || undefined,
        events: allEvents ? [] : Array.from(selected),
      })
      setUrl("")
      setDescription("")
      setAllEvents(true)
      setSelected(new Set())
      toast.success("Webhook endpoint created")
      router.refresh()
    } catch (err) {
      toast.error(err instanceof Error ? err.message : "Failed to create webhook")
    } finally {
      setCreating(false)
    }
  }

  async function withBusy(id: string, fn: () => Promise<void>) {
    setBusyId(id)
    try {
      await fn()
    } finally {
      setBusyId(null)
    }
  }

  async function handleTest(ep: WebhookEndpointDTO) {
    await withBusy(ep.id, async () => {
      try {
        const res = await sendTestWebhook(ep.id)
        if (res.ok) toast.success(`Test delivered (HTTP ${res.responseStatus})`)
        else toast.error(`Test failed: ${res.error ?? "no response"}`)
        router.refresh()
      } catch (err) {
        toast.error(err instanceof Error ? err.message : "Test failed")
      }
    })
  }

  async function handleToggle(ep: WebhookEndpointDTO) {
    await withBusy(ep.id, async () => {
      try {
        await updateWebhookEndpoint(ep.id, { status: ep.status === "active" ? "disabled" : "active" })
        toast.success(ep.status === "active" ? "Webhook disabled" : "Webhook enabled")
        router.refresh()
      } catch (err) {
        toast.error(err instanceof Error ? err.message : "Update failed")
      }
    })
  }

  async function handleRotate(ep: WebhookEndpointDTO) {
    if (!confirm("Rotate the signing secret? The current secret stops working immediately.")) return
    await withBusy(ep.id, async () => {
      try {
        await rotateWebhookSecret(ep.id)
        toast.success("Signing secret rotated")
        router.refresh()
      } catch (err) {
        toast.error(err instanceof Error ? err.message : "Rotate failed")
      }
    })
  }

  async function handleDelete(ep: WebhookEndpointDTO) {
    if (!confirm(`Delete webhook for ${ep.url}? This cannot be undone.`)) return
    await withBusy(ep.id, async () => {
      try {
        await deleteWebhookEndpoint(ep.id)
        toast.success("Webhook deleted")
        router.refresh()
      } catch (err) {
        toast.error(err instanceof Error ? err.message : "Delete failed")
      }
    })
  }

  return (
    <div className="space-y-6">
      {/* Create form */}
      <form
        onSubmit={handleCreate}
        className="space-y-4 rounded-xl border border-white/[0.06] bg-[#16161f] p-6"
      >
        <div>
          <h3 className="text-sm font-semibold text-white">Add an endpoint</h3>
          <p className="mt-0.5 text-xs text-white/40">
            We&apos;ll POST a signed JSON payload to this URL whenever a subscribed event happens.
          </p>
        </div>

        <input
          type="url"
          required
          value={url}
          onChange={(e) => setUrl(e.target.value)}
          placeholder="https://hooks.zapier.com/hooks/catch/…"
          className={inputClass}
        />
        <input
          type="text"
          maxLength={200}
          value={description}
          onChange={(e) => setDescription(e.target.value)}
          placeholder="Description (optional) — e.g. Zapier: new tenant → Slack"
          className={inputClass}
        />

        <div className="rounded-lg border border-white/[0.06] bg-white/[0.02] p-4">
          <label className="flex cursor-pointer items-center gap-2.5">
            <input
              type="checkbox"
              checked={allEvents}
              onChange={(e) => setAllEvents(e.target.checked)}
              className="h-4 w-4 rounded border-white/20 bg-white/5 text-indigo-500 focus:ring-indigo-500"
            />
            <span className="text-sm font-medium text-white">Send all events</span>
          </label>

          {!allEvents && (
            <div className="mt-3 grid gap-2 border-t border-white/[0.06] pt-3 sm:grid-cols-2">
              {WEBHOOK_EVENTS.map((ev) => (
                <label key={ev.id} className="flex cursor-pointer items-start gap-2.5">
                  <input
                    type="checkbox"
                    checked={selected.has(ev.id)}
                    onChange={() => toggleEvent(ev.id)}
                    className="mt-0.5 h-4 w-4 rounded border-white/20 bg-white/5 text-indigo-500 focus:ring-indigo-500"
                  />
                  <span>
                    <code className="text-xs font-mono text-indigo-300">{ev.id}</code>
                    <span className="block text-[11px] text-white/40">{ev.label}</span>
                  </span>
                </label>
              ))}
            </div>
          )}
        </div>

        <button
          type="submit"
          disabled={creating || !url.trim() || (!allEvents && selected.size === 0)}
          className="inline-flex items-center justify-center gap-2 rounded-lg bg-indigo-600 px-5 py-2.5 text-sm font-semibold text-white transition hover:bg-indigo-500 disabled:opacity-50"
        >
          {creating ? <Loader2 className="h-4 w-4 animate-spin" /> : <Plus className="h-4 w-4" />}
          Add endpoint
        </button>
      </form>

      {/* Endpoints list */}
      <div className="rounded-xl border border-white/[0.06] bg-[#16161f]">
        <div className="border-b border-white/[0.06] px-6 py-4">
          <h3 className="text-sm font-semibold text-white">
            Endpoints <span className="text-white/30">({initialEndpoints.length})</span>
          </h3>
        </div>

        {initialEndpoints.length === 0 ? (
          <div className="px-6 py-10 text-center text-sm text-white/40">
            No endpoints yet. Add one above to start receiving events.
          </div>
        ) : (
          <ul className="divide-y divide-white/[0.06]">
            {initialEndpoints.map((ep) => {
              const busy = busyId === ep.id
              const disabled = ep.status === "disabled"
              return (
                <li key={ep.id} className="space-y-3 px-6 py-4">
                  <div className="flex flex-wrap items-start justify-between gap-3">
                    <div className="min-w-0">
                      <div className="flex items-center gap-2">
                        <Webhook className="h-4 w-4 shrink-0 text-white/30" />
                        <p className="truncate text-sm font-medium text-white">{ep.url}</p>
                        {disabled && (
                          <span className="rounded-full border border-white/10 bg-white/5 px-2 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-white/40">
                            Disabled
                          </span>
                        )}
                        {ep.source === "zapier" && (
                          <span className="rounded-full border border-orange-500/20 bg-orange-500/10 px-2 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-orange-300">
                            Zapier
                          </span>
                        )}
                      </div>
                      <div className="mt-1 flex flex-wrap items-center gap-x-3 gap-y-0.5 pl-6 text-xs text-white/40">
                        <span>{eventsSummary(ep.events)}</span>
                        <span>Last success {formatDate(ep.last_success_at)}</span>
                        {ep.failure_count > 0 && (
                          <span className="text-red-400">{ep.failure_count} recent failure{ep.failure_count > 1 ? "s" : ""}</span>
                        )}
                      </div>
                      {ep.description && (
                        <p className="mt-1 pl-6 text-xs text-white/30">{ep.description}</p>
                      )}
                    </div>

                    <div className="flex shrink-0 items-center gap-1.5">
                      <button
                        type="button"
                        onClick={() => handleTest(ep)}
                        disabled={busy}
                        title="Send test event"
                        className="inline-flex items-center gap-1.5 rounded-lg border border-white/10 px-2.5 py-1.5 text-xs font-medium text-white/70 transition hover:bg-white/5 disabled:opacity-50"
                      >
                        {busy ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Send className="h-3.5 w-3.5" />}
                        Test
                      </button>
                      <button
                        type="button"
                        onClick={() => handleToggle(ep)}
                        disabled={busy}
                        title={disabled ? "Enable" : "Disable"}
                        className="rounded-lg border border-white/10 p-2 text-white/50 transition hover:bg-white/5 hover:text-white disabled:opacity-50"
                      >
                        <Power className="h-3.5 w-3.5" />
                      </button>
                      <button
                        type="button"
                        onClick={() => handleRotate(ep)}
                        disabled={busy}
                        title="Rotate signing secret"
                        className="rounded-lg border border-white/10 p-2 text-white/50 transition hover:bg-white/5 hover:text-white disabled:opacity-50"
                      >
                        <RefreshCw className="h-3.5 w-3.5" />
                      </button>
                      <button
                        type="button"
                        onClick={() => handleDelete(ep)}
                        disabled={busy}
                        title="Delete"
                        className="rounded-lg border border-red-500/20 p-2 text-red-400 transition hover:bg-red-500/10 disabled:opacity-50"
                      >
                        <Trash2 className="h-3.5 w-3.5" />
                      </button>
                    </div>
                  </div>

                  <SecretField secret={ep.secret} />
                </li>
              )
            })}
          </ul>
        )}
      </div>
    </div>
  )
}