import { FastifyPluginAsync } from 'fastify'
import { db } from '../db'
import { broadcast } from './ws'

type SlugParam   = { Params: { slug: string } }
type SlugIdParam = { Params: { slug: string; id: string } }

export interface NotificationRow {
  id: string
  hotel_id: string
  type: string
  title: string
  body: string
  booking_id: string | null
  room_id: string | null
  link: string | null
  is_read: boolean
  created_at: string
}

export async function createNotification(
  hotelId: string,
  hotelSlug: string,
  data: {
    type: string
    title: string
    body: string
    bookingId?: string | null
    roomId?: string | null
    link?: string | null
  },
): Promise<NotificationRow> {
  const { rows } = await db.query<NotificationRow>(
    `INSERT INTO notifications (hotel_id, type, title, body, booking_id, room_id, link)
     VALUES ($1,$2,$3,$4,$5,$6,$7) RETURNING *`,
    [hotelId, data.type, data.title, data.body,
     data.bookingId ?? null, data.roomId ?? null, data.link ?? null],
  )
  const notif = rows[0]
  broadcast(hotelSlug, { type: 'notification:new', notification: notif })
  return notif
}

const notifications: FastifyPluginAsync = async (fastify) => {
  const getHotelId = async (slug: string): Promise<string | null> => {
    const { rows } = await db.query('SELECT id FROM hotels WHERE slug = $1', [slug])
    return rows[0]?.id ?? null
  }

  const canAccess = (userSlug: string | null, role: string, slug: string) =>
    role === 'super_admin' || userSlug === slug

  // GET /api/hotels/:slug/notifications
  fastify.get<SlugParam>(
    '/api/hotels/:slug/notifications',
    { onRequest: [fastify.authenticate] },
    async (request, reply) => {
      const { slug } = request.params
      if (!canAccess(request.user.hotelSlug, request.user.role, slug))
        return reply.code(403).send({ error: 'Forbidden' })
      const hotelId = await getHotelId(slug)
      if (!hotelId) return reply.code(404).send({ error: 'Hotel not found' })

      const { rows } = await db.query<NotificationRow>(
        `SELECT * FROM notifications WHERE hotel_id = $1
         ORDER BY created_at DESC LIMIT 100`,
        [hotelId],
      )
      return rows
    },
  )

  // PATCH /api/hotels/:slug/notifications/:id  — mark read
  fastify.patch<SlugIdParam>(
    '/api/hotels/:slug/notifications/:id',
    { onRequest: [fastify.authenticate] },
    async (request, reply) => {
      const { slug, id } = request.params
      if (!canAccess(request.user.hotelSlug, request.user.role, slug))
        return reply.code(403).send({ error: 'Forbidden' })
      const hotelId = await getHotelId(slug)
      if (!hotelId) return reply.code(404).send({ error: 'Hotel not found' })

      const { rows } = await db.query<NotificationRow>(
        `UPDATE notifications SET is_read = true WHERE id = $1 AND hotel_id = $2 RETURNING *`,
        [id, hotelId],
      )
      if (!rows[0]) return reply.code(404).send({ error: 'Not found' })
      return rows[0]
    },
  )

  // POST /api/hotels/:slug/notifications/read-all
  fastify.post<SlugParam>(
    '/api/hotels/:slug/notifications/read-all',
    { onRequest: [fastify.authenticate] },
    async (request, reply) => {
      const { slug } = request.params
      if (!canAccess(request.user.hotelSlug, request.user.role, slug))
        return reply.code(403).send({ error: 'Forbidden' })
      const hotelId = await getHotelId(slug)
      if (!hotelId) return reply.code(404).send({ error: 'Hotel not found' })

      await db.query(
        `UPDATE notifications SET is_read = true WHERE hotel_id = $1 AND is_read = false`,
        [hotelId],
      )
      return { ok: true }
    },
  )

  // DELETE /api/hotels/:slug/notifications/:id
  fastify.delete<SlugIdParam>(
    '/api/hotels/:slug/notifications/:id',
    { onRequest: [fastify.authenticate] },
    async (request, reply) => {
      const { slug, id } = request.params
      if (!canAccess(request.user.hotelSlug, request.user.role, slug))
        return reply.code(403).send({ error: 'Forbidden' })
      const hotelId = await getHotelId(slug)
      if (!hotelId) return reply.code(404).send({ error: 'Hotel not found' })

      const { rowCount } = await db.query(
        `DELETE FROM notifications WHERE id = $1 AND hotel_id = $2`,
        [id, hotelId],
      )
      if (!rowCount) return reply.code(404).send({ error: 'Not found' })
      return reply.code(204).send()
    },
  )
}

export default notifications