import { query } from '../db/client.js'

export type RealtimeEventRow = {
  id: number
  event_type: string
  entity_id: number
  scopes: unknown
  operation: string
  data: unknown
  admin_audience: boolean
  worker_ids: unknown
  broadcast_workers: boolean
  occurred_at: string
}

export async function createRealtimeEvent(input: {
  eventType: string
  entityId: number
  scopes: string[]
  operation: string
  data?: unknown
  adminAudience: boolean
  workerIds: number[]
  broadcastWorkers: boolean
  occurredAt: string
}): Promise<RealtimeEventRow> {
  const result = await query<RealtimeEventRow>(
    `
      INSERT INTO realtime_events (
        event_type, entity_id, scopes, operation, data,
        admin_audience, worker_ids, broadcast_workers, occurred_at
      ) VALUES ($1, $2, $3::jsonb, $4, $5::jsonb, $6, $7::jsonb, $8, $9)
      RETURNING *
    `,
    [
      input.eventType,
      input.entityId,
      JSON.stringify(input.scopes),
      input.operation,
      input.data === undefined ? null : JSON.stringify(input.data),
      input.adminAudience,
      JSON.stringify(input.workerIds),
      input.broadcastWorkers,
      input.occurredAt,
    ],
  )
  const row = result.rows[0]
  if (!row) throw new Error('realtime_event_create_failed')

  // 事件仅用于短期断线补发；每 100 条清理一次，避免每次业务事件都额外触发 DELETE。
  if (Number(row.id) % 100 === 0) {
    await query(
      `
        DELETE FROM realtime_events
        WHERE id < GREATEST(0, (SELECT COALESCE(MAX(id), 0) - 500 FROM realtime_events))
      `,
    )
  }
  return row
}

export async function listRealtimeEventsAfter(eventId: number, limit = 500) {
  const result = await query<RealtimeEventRow>(
    `
      SELECT * FROM realtime_events
      WHERE id > $1
      ORDER BY id ASC
      LIMIT $2
    `,
    [Math.max(0, Number(eventId) || 0), Math.min(500, Math.max(1, Number(limit) || 500))],
  )
  return result.rows
}