import { db } from './db'
import { broadcast } from './routes/ws'
import { createNotification } from './routes/notifications'
import { getHkSettings } from './routes/housekeeping-settings'

const JOB_INTERVAL_MS = 60 * 60 * 1000  // every 1 hour

async function runAutoJobs(): Promise<void> {
  try {
    await runAutoCancelNoShows()
    await runAutoCheckouts()
  } catch (err) {
    console.error('[jobs] error running auto jobs:', err)
  }
}

async function runAutoCancelNoShows(): Promise<void> {
  // Find hotels where auto_cancel_noshow_enabled = true
  // Also fetch check_in_time to calculate from the correct arrival time
  const { rows: hotels } = await db.query<{
    id: string; slug: string; hours: number; checkInTime: string
  }>(`
    SELECT h.id, h.slug,
           COALESCE(h.check_in_time, '14:00') AS "checkInTime",
           COALESCE(
             (SELECT (value::text)::int FROM hotel_settings
              WHERE hotel_id = h.id AND key = 'auto_cancel_noshow_hours'),
             24
           ) AS hours
    FROM hotels h
    WHERE EXISTS (
      SELECT 1 FROM hotel_settings
      WHERE hotel_id = h.id
        AND key = 'auto_cancel_noshow_enabled'
        AND value = 'true'::jsonb
    )
  `)

  for (const hotel of hotels) {
    // Threshold = check_in date + hotel check-in time + N hours
    // e.g. check-in date 2025-03-23, check_in_time=14:00, hours=24 → cancel after 14:00 next day
    const { rows: bookings } = await db.query<{
      id: string; guest_name: string | null; room_id: string
    }>(`
      SELECT b.id, b.guest_name, b.room_id
      FROM bookings b
      WHERE b.hotel_id = $1
        AND b.status = 'confirmed'
        AND (
          b.check_in::date
          + $2::time
          + ($3 || ' hours')::interval
        ) < NOW()
    `, [hotel.id, hotel.checkInTime, hotel.hours])

    for (const b of bookings) {
      const { rows } = await db.query(
        `UPDATE bookings SET status = 'no_show', updated_at = NOW()
         WHERE id = $1 RETURNING *`,
        [b.id],
      )
      if (rows[0]) {
        broadcast(hotel.slug, { type: 'booking:updated', booking: rows[0] })
      }
      await createNotification(hotel.id, hotel.slug, {
        type: 'booking_cancelled',
        title: 'Гость не заехал — бронь отменена',
        body: `${b.guest_name ?? 'Гость'} не заехал вовремя. Бронирование автоматически отмечено как неявка.`,
        bookingId: b.id,
        link: `/${hotel.slug}/bookings`,
      }).catch(() => {})
    }
  }
}

async function runAutoCheckouts(): Promise<void> {
  // Find hotels where auto_checkout_enabled = true
  // Also fetch check_out_time so we calculate from the correct departure time
  const { rows: hotels } = await db.query<{
    id: string; slug: string; hours: number; checkOutTime: string
  }>(`
    SELECT h.id, h.slug,
           COALESCE(h.check_out_time, '12:00') AS "checkOutTime",
           COALESCE(
             (SELECT (value::text)::int FROM hotel_settings
              WHERE hotel_id = h.id AND key = 'auto_checkout_hours'),
             12
           ) AS hours
    FROM hotels h
    WHERE EXISTS (
      SELECT 1 FROM hotel_settings
      WHERE hotel_id = h.id
        AND key = 'auto_checkout_enabled'
        AND value = 'true'::jsonb
    )
  `)

  for (const hotel of hotels) {
    // Threshold = check_out date + hotel checkout time + N hours
    // e.g. checkout date 2025-03-23, check_out_time=12:00, hours=2 → auto-checkout after 14:00
    const { rows: bookings } = await db.query<{
      id: string; guest_name: string | null; room_id: string
    }>(`
      SELECT b.id, b.guest_name, b.room_id
      FROM bookings b
      WHERE b.hotel_id = $1
        AND b.status = 'checked_in'
        AND (
          b.check_out::date
          + $2::time
          + ($3 || ' hours')::interval
        ) < NOW()
    `, [hotel.id, hotel.checkOutTime, hotel.hours])

    for (const b of bookings) {
      // Update booking to checked_out
      const { rows } = await db.query(
        `UPDATE bookings SET status = 'checked_out', updated_at = NOW()
         WHERE id = $1 RETURNING *`,
        [b.id],
      )
      if (rows[0]) {
        broadcast(hotel.slug, { type: 'booking:updated', booking: rows[0] })
      }

      // Auto-create housekeeping task if enabled
      const hkSettings = await getHkSettings(hotel.id).catch(() => null)
      if (hkSettings?.checkout_auto && b.room_id) {
        const today = new Date().toISOString().slice(0, 10)
        const { rows: taskRows } = await db.query(
          `INSERT INTO housekeeping_tasks
             (hotel_id, room_id, type, priority, notes, due_date)
           VALUES ($1,$2,'turnover',$3,$4,$5)
           RETURNING *`,
          [hotel.id, b.room_id, hkSettings.checkout_priority,
           `Автоматическая уборка после выезда${b.guest_name ? ': ' + b.guest_name : ''}`,
           today],
        )
        await db.query(
          `UPDATE rooms SET housekeeping_status = 'dirty' WHERE id = $1`,
          [b.room_id],
        )
        if (taskRows[0]) {
          broadcast(hotel.slug, { type: 'housekeeping_task_created', task: taskRows[0] })
        }
      }

      await createNotification(hotel.id, hotel.slug, {
        type: 'booking_checkout',
        title: 'Автоматическое выселение',
        body: `${b.guest_name ?? 'Гость'} выселен автоматически по истечении времени проживания.`,
        bookingId: b.id,
        link: `/${hotel.slug}/calendar`,
      }).catch(() => {})
    }
  }
}

export function startJobs(): void {
  // Small delay to let DB migrations finish on startup
  setTimeout(() => {
    runAutoJobs().catch(console.error)
  }, 15_000)

  setInterval(() => {
    runAutoJobs().catch(console.error)
  }, JOB_INTERVAL_MS)
}