import { NextResponse } from "next/server"
import { desc, eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { webhook_endpoints } from "@/lib/db/schema"
import { resolveApiRequest } from "@/lib/api-auth"
import { webhookEndpointSchema } from "@/lib/validations"
import { isWebhookEvent } from "@/lib/webhooks/events"
import { assertSafeWebhookUrl, WebhookUrlError } from "@/lib/webhooks/ssrf"
import { generateWebhookSecret } from "@/lib/webhooks/deliver"

// Public REST API (v1) — outbound webhook subscriptions. Bearer API-key auth.
// This is the surface Zapier's REST Hooks use: POST here to subscribe, DELETE
// /:id to unsubscribe. Scoped by the resolved account owner id.

const unauthorized = () =>
  NextResponse.json({ error: { code: 401, message: "Unauthorized" } }, { status: 401 })
const forbidden = () =>
  NextResponse.json({ error: { code: 403, message: "Forbidden" } }, { status: 403 })
const badRequest = (message: unknown) =>
  NextResponse.json({ error: { code: 400, message } }, { status: 400 })

// The signing secret is not returned on list/read (only at creation & rotation).
const PUBLIC_COLUMNS = {
  id: webhook_endpoints.id,
  url: webhook_endpoints.url,
  description: webhook_endpoints.description,
  events: webhook_endpoints.events,
  status: webhook_endpoints.status,
  source: webhook_endpoints.source,
  last_success_at: webhook_endpoints.last_success_at,
  last_error_at: webhook_endpoints.last_error_at,
  failure_count: webhook_endpoints.failure_count,
  created_at: webhook_endpoints.created_at,
}

export async function GET(request: Request) {
  const ctx = await resolveApiRequest(request)
  if (!ctx) return unauthorized()

  const data = await db
    .select(PUBLIC_COLUMNS)
    .from(webhook_endpoints)
    .where(eq(webhook_endpoints.user_id, ctx.ownerId))
    .orderBy(desc(webhook_endpoints.created_at))

  return NextResponse.json({ data, count: data.length })
}

export async function POST(request: Request) {
  const ctx = await resolveApiRequest(request)
  if (!ctx) return unauthorized()
  if (!ctx.canWrite) return forbidden()

  const body = await request.json().catch(() => null)
  const parsed = webhookEndpointSchema.safeParse(body)
  if (!parsed.success) return badRequest(parsed.error.flatten())

  try {
    await assertSafeWebhookUrl(parsed.data.url)
  } catch (e) {
    return badRequest(e instanceof WebhookUrlError ? e.message : "Invalid webhook URL")
  }

  // Requests coming through Zapier's REST-hook subscribe carry a Zapier UA.
  const ua = request.headers.get("user-agent") ?? ""
  const source = /zapier/i.test(ua) ? "zapier" : "api"

  const [data] = await db
    .insert(webhook_endpoints)
    .values({
      user_id: ctx.ownerId,
      url: parsed.data.url,
      description: parsed.data.description || null,
      events: Array.from(new Set(parsed.data.events.filter(isWebhookEvent))),
      secret: generateWebhookSecret(),
      source,
    })
    .returning()

  // Return the secret exactly once, at creation, so the subscriber can verify signatures.
  return NextResponse.json({ data }, { status: 201 })
}
