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

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

const MODULES = ['deposit', 'booking-widget', 'room-service'] as const

function canAccess(userSlug: string | null, role: string, slug: string) {
  if (role === 'super_admin') return true
  return userSlug === slug
}

const paymentGateways: 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
  }

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

    const { rows } = await db.query(
      `SELECT id, provider, label, shop_id,
              CASE WHEN secret_key IS NOT NULL THEN '••••••••' ELSE NULL END AS secret_key,
              currency, is_active, modules, created_at
         FROM hotel_payment_gateways WHERE hotel_id = $1 ORDER BY created_at`,
      [hotelId],
    )
    return rows.map(r => ({
      id: r.id, provider: r.provider, label: r.label,
      shopId: r.shop_id, secretKey: r.secret_key,
      currency: r.currency, isActive: r.is_active,
      modules: r.modules ?? MODULES, createdAt: r.created_at,
      autoConfirmOnPayment: r.auto_confirm_on_payment ?? true,
    }))
  })

  // ── POST /api/hotels/:slug/payment-gateways ────────────────────────────────
  fastify.post<SlugParam & { Body: { provider: string; label: string; shopId: string; secretKey: string; currency: string; modules: string[] } }>(
    '/api/hotels/:slug/payment-gateways', { onRequest: [fastify.authenticate] }, async (req, reply) => {
      const { slug } = req.params
      if (!canAccess(req.user.hotelSlug, req.user.role, slug)) return reply.code(403).send({ error: 'Forbidden' })
      const hotelId = await getHotelId(slug)
      if (!hotelId) return reply.code(404).send({ error: 'Not found' })
      const { provider = 'yookassa', label, shopId, secretKey, currency = 'RUB', modules = MODULES } = req.body
      const { rows } = await db.query(
        `INSERT INTO hotel_payment_gateways (hotel_id, provider, label, shop_id, secret_key, currency, modules)
         VALUES ($1,$2,$3,$4,$5,$6,$7) RETURNING *`,
        [hotelId, provider, label, shopId || null, secretKey || null, currency, JSON.stringify(modules)],
      )
      const r = rows[0]
      return { id: r.id, provider: r.provider, label: r.label, shopId: r.shop_id,
               secretKey: r.secret_key ? '••••••••' : null,
               currency: r.currency, isActive: r.is_active, modules: r.modules,
               autoConfirmOnPayment: r.auto_confirm_on_payment ?? true }
    }
  )

  // ── PATCH /api/hotels/:slug/payment-gateways/:id ───────────────────────────
  fastify.patch<SlugIdParam & { Body: { label?: string; shopId?: string; secretKey?: string; currency?: string; isActive?: boolean; modules?: string[]; autoConfirmOnPayment?: boolean } }>(
    '/api/hotels/:slug/payment-gateways/:id', { onRequest: [fastify.authenticate] }, async (req, reply) => {
      const { slug, id } = req.params
      if (!canAccess(req.user.hotelSlug, req.user.role, slug)) return reply.code(403).send({ error: 'Forbidden' })
      const hotelId = await getHotelId(slug)
      if (!hotelId) return reply.code(404).send({ error: 'Not found' })
      const { label, shopId, secretKey, currency, isActive, modules, autoConfirmOnPayment } = req.body
      const { rows } = await db.query(
        `UPDATE hotel_payment_gateways SET
           label                   = COALESCE($1, label),
           shop_id                 = COALESCE($2, shop_id),
           secret_key              = CASE WHEN $3 IS NOT NULL AND $3 != '••••••••' THEN $3 ELSE secret_key END,
           currency                = COALESCE($4, currency),
           is_active               = COALESCE($5, is_active),
           modules                 = COALESCE($6::jsonb, modules),
           auto_confirm_on_payment = COALESCE($7, auto_confirm_on_payment)
         WHERE id = $8 AND hotel_id = $9 RETURNING *`,
        [label ?? null, shopId ?? null, secretKey ?? null, currency ?? null,
         isActive ?? null, modules ? JSON.stringify(modules) : null,
         autoConfirmOnPayment ?? null, id, hotelId],
      )
      if (!rows[0]) return reply.code(404).send({ error: 'Not found' })
      const r = rows[0]
      return { id: r.id, provider: r.provider, label: r.label, shopId: r.shop_id,
               secretKey: r.secret_key ? '••••••••' : null,
               currency: r.currency, isActive: r.is_active, modules: r.modules,
               autoConfirmOnPayment: r.auto_confirm_on_payment ?? true }
    }
  )

  // ── DELETE /api/hotels/:slug/payment-gateways/:id ──────────────────────────
  fastify.delete<SlugIdParam>('/api/hotels/:slug/payment-gateways/:id', { onRequest: [fastify.authenticate] }, async (req, reply) => {
    const { slug, id } = req.params
    if (!canAccess(req.user.hotelSlug, req.user.role, slug)) return reply.code(403).send({ error: 'Forbidden' })
    const hotelId = await getHotelId(slug)
    if (!hotelId) return reply.code(404).send({ error: 'Not found' })
    await db.query('DELETE FROM hotel_payment_gateways WHERE id = $1 AND hotel_id = $2', [id, hotelId])
    return { ok: true }
  })
}

export default paymentGateways

// Helper: get active gateway for a given module
export async function getGatewayForModule(hotelId: string, module: string) {
  const { rows } = await db.query(
    `SELECT * FROM hotel_payment_gateways
      WHERE hotel_id = $1 AND is_active = true AND modules @> $2::jsonb
      ORDER BY created_at LIMIT 1`,
    [hotelId, JSON.stringify([module])],
  )
  return rows[0] ?? null
}