// Hash 操作
import { getClient } from './connection'

export async function getHashFields(
  id: string, key: string, cursor: string, count: number
): Promise<{ cursor: string; fields: [string, string][] }> {
  const client = getClient(id)
  if (!client) throw new Error(`Client ${id} not found`)
  const [nextCursor, raw] = await client.hscan(key, cursor, 'COUNT', count)
  const fields: [string, string][] = []
  for (let i = 0; i < raw.length; i += 2) {
    fields.push([raw[i], raw[i + 1]])
  }
  return { cursor: nextCursor, fields }
}

export async function setHashField(
  id: string, key: string, field: string, value: string
): Promise<void> {
  const client = getClient(id)
  if (!client) throw new Error(`Client ${id} not found`)
  await client.hset(key, field, value)
}

export async function deleteHashField(id: string, key: string, field: string): Promise<void> {
  const client = getClient(id)
  if (!client) throw new Error(`Client ${id} not found`)
  await client.hdel(key, field)
}