import { SimplePool } from 'nostr-tools'
import type { Filter } from 'nostr-tools'
import type { Event } from 'nostr-tools'

/**
 * Subscription interface matching nostr-tools 2.x API
 */
export interface Subscription {
  on(event: 'event', callback: (event: Event) => void): void
  on(event: 'eose', callback: () => void): void
  unsub(): void
}

/**
 * Alias for SimplePool with typed sub method from nostr-tools definitions.
 * In nostr-tools 2.x, SimplePool has a sub method but it's not properly typed.
 */
export interface SimplePoolWithSub extends SimplePool {
  sub(relays: string[], filters: Filter[]): Subscription
}

export function hasSubMethod(pool: SimplePool): pool is SimplePoolWithSub {
  return typeof (pool as any).sub === 'function'
}