import { FastifyPluginAsync } from 'fastify'
import { db } from '../db'
import { encryptField, decryptField, passportToken } from '../lib/crypto'

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

const GUEST_FIELDS = `
  g.id, g.hotel_id, g.first_name, g.last_name, g.middle_name, g.email, g.phone,
  g.passport, g.passport_series, g.passport_number,
  g.birth_date, g.nationality, g.gender, g.city, g.notes, g.tags,
  g.loyalty_tier, g.loyalty_points, g.rating,
  g.created_at, g.updated_at`

const STATS_JOIN = `
  LEFT JOIN (
    SELECT
      guest_id,
      COUNT(*) FILTER (WHERE status NOT IN ('cancelled', 'no_show')) AS total_stays,
      COALESCE(SUM(paid_amount) FILTER (WHERE status = 'checked_out'), 0) AS total_spent,
      MAX(check_out) FILTER (WHERE status = 'checked_out') AS last_visit
    FROM bookings
    WHERE hotel_id = $1
    GROUP BY guest_id
  ) stats ON stats.guest_id = g.id`

// Расшифровывает чувствительные поля строки гостя перед отправкой клиенту
function decryptGuest(row: Record<string, unknown>) {
  return {
    ...row,
    passport:        decryptField(row.passport        as string | null),
    passport_series: decryptField(row.passport_series as string | null),
    passport_number: decryptField(row.passport_number as string | null),
    birth_date:      decryptField(row.birth_date      as string | null),
  }
}

const guests: 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/guests ────────────────────────────────────────────
  // ?q=<имя/email/телефон>  или  ?passport=<серия+номер>
  fastify.get<SlugParam & { Querystring: { q?: string; passport?: string } }>(
    '/api/hotels/:slug/guests',
    { 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 { q, passport: passportQ } = request.query as { q?: string; passport?: string }
      const params: unknown[] = [hotelId]
      let where = 'WHERE g.hotel_id = $1'

      if (passportQ) {
        // Точный поиск по паспорту через HMAC-токен (зашифрованные поля не ищутся через LIKE)
        params.push(passportToken(passportQ))
        where += ` AND g.passport_search_token = $2`
      } else if (q) {
        params.push(`%${q.toLowerCase()}%`)
        where += ` AND (
          LOWER(g.first_name) LIKE $2 OR LOWER(g.last_name) LIKE $2 OR
          LOWER(COALESCE(g.email,'')) LIKE $2 OR COALESCE(g.phone,'') LIKE $2
        )`
      }

      const { rows } = await db.query(
        `SELECT ${GUEST_FIELDS},
          COALESCE(stats.total_stays, 0) AS total_stays,
          COALESCE(stats.total_spent, 0) AS total_spent,
          stats.last_visit
         FROM guests g ${STATS_JOIN}
         ${where}
         ORDER BY g.last_name, g.first_name`,
        params,
      )
      return rows.map(decryptGuest)
    },
  )

  // ── GET /api/hotels/:slug/guests/:id ────────────────────────────────────────
  fastify.get<SlugIdParam>(
    '/api/hotels/:slug/guests/: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: [guest] } = await db.query(
        `SELECT ${GUEST_FIELDS},
          COALESCE(stats.total_stays, 0) AS total_stays,
          COALESCE(stats.total_spent, 0) AS total_spent,
          stats.last_visit
         FROM guests g ${STATS_JOIN}
         WHERE g.id = $2 AND g.hotel_id = $1`,
        [hotelId, id],
      )
      if (!guest) return reply.code(404).send({ error: 'Guest not found' })

      const { rows: history } = await db.query(
        `SELECT b.id, b.check_in, b.check_out, b.status,
                b.total_amount, b.paid_amount,
                r.number AS room_number, r.type AS room_type
         FROM bookings b
         LEFT JOIN rooms r ON r.id = b.room_id
         WHERE b.guest_id = $1 AND b.hotel_id = $2
         ORDER BY b.check_in DESC`,
        [id, hotelId],
      )
      return { ...decryptGuest(guest), history }
    },
  )

  // ── POST /api/hotels/:slug/guests ────────────────────────────────────────────
  fastify.post<SlugParam & { Body: {
    first_name: string; last_name: string; middle_name?: string
    email?: string; phone?: string
    passport?: string; passport_series?: string; passport_number?: string
    birth_date?: string; nationality?: string; gender?: string; city?: string
    notes?: string; tags?: string[]; rating?: number
  } }>(
    '/api/hotels/:slug/guests',
    { 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 b = request.body

      // Если передан паспорт — ищем существующего гостя по HMAC-токену
      if (b.passport_series && b.passport_number) {
        const token = passportToken(b.passport_series.trim() + b.passport_number.trim())
        const { rows: existing } = await db.query(
          `SELECT id FROM guests WHERE hotel_id = $1 AND passport_search_token = $2`,
          [hotelId, token],
        )
        if (existing.length > 0) {
          const { rows: [updated] } = await db.query(
            `UPDATE guests SET
               first_name  = COALESCE($3, first_name),
               last_name   = COALESCE($4, last_name),
               middle_name = COALESCE($5, middle_name),
               email       = COALESCE($6, email),
               phone       = COALESCE($7, phone),
               updated_at  = NOW()
             WHERE id = $1 AND hotel_id = $2
             RETURNING *`,
            [existing[0].id, hotelId,
              b.first_name || null, b.last_name || null, b.middle_name || null,
              b.email || null, b.phone || null],
          )
          return reply.code(200).send(decryptGuest(updated))
        }
      }

      // Вычисляем токен и шифруем поля перед вставкой
      const token = (b.passport_series && b.passport_number)
        ? passportToken(b.passport_series.trim() + b.passport_number.trim())
        : null

      const { rows: [guest] } = await db.query(
        `INSERT INTO guests
           (hotel_id, first_name, last_name, middle_name, email, phone,
            passport, passport_series, passport_number, passport_search_token,
            birth_date, nationality, gender, city, notes, tags, rating)
         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17)
         RETURNING *`,
        [
          hotelId, b.first_name, b.last_name, b.middle_name ?? null,
          b.email ?? null, b.phone ?? null,
          encryptField(b.passport ?? null),
          encryptField(b.passport_series ?? null),
          encryptField(b.passport_number ?? null),
          token,
          encryptField(b.birth_date ?? null),
          b.nationality ?? null, b.gender ?? null, b.city ?? null,
          b.notes ?? '', b.tags ?? [], b.rating ?? 3,
        ],
      )
      return reply.code(201).send(decryptGuest(guest))
    },
  )

  // ── PATCH /api/hotels/:slug/guests/:id ──────────────────────────────────────
  fastify.patch<SlugIdParam & { Body: Partial<{
    first_name: string; last_name: string; middle_name: string
    email: string; phone: string
    passport: string; passport_series: string; passport_number: string
    birth_date: string; nationality: string; gender: string; city: string
    notes: string; tags: string[]; rating: number
  }> }>(
    '/api/hotels/:slug/guests/: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 b = request.body
      const sets: string[] = []
      const vals: unknown[] = [id, hotelId]
      let idx = 3

      const add = (col: string, val: unknown) => {
        if (val !== undefined) { sets.push(`${col} = $${idx++}`); vals.push(val) }
      }

      add('first_name',  b.first_name)
      add('last_name',   b.last_name)
      add('middle_name', b.middle_name)
      add('email',       b.email)
      add('phone',       b.phone)
      add('nationality', b.nationality)
      add('gender',      b.gender)
      add('city',        b.city)
      add('notes',       b.notes)
      add('tags',        b.tags)
      add('rating',      b.rating)
      // Шифруем чувствительные поля
      if (b.passport !== undefined)        add('passport',        encryptField(b.passport))
      if (b.passport_series !== undefined) add('passport_series', encryptField(b.passport_series))
      if (b.passport_number !== undefined) add('passport_number', encryptField(b.passport_number))
      if (b.birth_date !== undefined)      add('birth_date',      encryptField(b.birth_date || null))
      // Обновляем токен если поменялся паспорт
      if (b.passport_series !== undefined || b.passport_number !== undefined) {
        // Читаем текущие значения если нужно
        const { rows: [cur] } = await db.query(
          'SELECT passport_series, passport_number FROM guests WHERE id = $1 AND hotel_id = $2',
          [id, hotelId],
        )
        const series = b.passport_series ?? decryptField(cur?.passport_series) ?? ''
        const number = b.passport_number ?? decryptField(cur?.passport_number) ?? ''
        if (series && number) add('passport_search_token', passportToken(series.trim() + number.trim()))
      }

      if (sets.length === 0) return reply.code(400).send({ error: 'No fields to update' })
      sets.push('updated_at = NOW()')

      const { rows: [guest] } = await db.query(
        `UPDATE guests SET ${sets.join(', ')} WHERE id = $1 AND hotel_id = $2 RETURNING *`,
        vals,
      )
      if (!guest) return reply.code(404).send({ error: 'Guest not found' })
      return decryptGuest(guest)
    },
  )

  // ── DELETE /api/hotels/:slug/guests/:id ─────────────────────────────────────
  fastify.delete<SlugIdParam>(
    '/api/hotels/:slug/guests/: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' })

      await db.query('DELETE FROM guests WHERE id = $1 AND hotel_id = $2', [id, hotelId])
      return reply.code(204).send()
    },
  )
}

export default guests