import {
  Filter,
  SimplePool,
  VerifiedEvent,
  kinds,
  validateEvent,
  verifyEvent
} from 'nostr-tools'

export class MetadataController {
  constructor() {}

  public findMetadata = async (hexKey: string) => {
    const mostPopularRelays = import.meta.env.VITE_MOST_POPULAR_RELAYS
    const hardcodedPopularRelays = (mostPopularRelays || '').split(' ')
    const specialMetadataRelay = 'wss://purplepag.es'

    const relays = [...hardcodedPopularRelays, specialMetadataRelay]

    const eventFilter: Filter = {
      kinds: [kinds.Metadata],
      authors: [hexKey]
    }

    const pool = new SimplePool()

    const events = await pool.querySync(relays, eventFilter).catch((err) => {
      console.error(err)
      return null
    })

    if (events && events.length) {
      events.sort((a, b) => b.created_at - a.created_at)

      for (const event of events) {
        if (validateEvent(event) && verifyEvent(event)) {
          return event
        }
      }
    }

    throw new Error('Mo metadata found.')
  }

  public extractProfileMetadataContent = (event: VerifiedEvent) => {
    try {
      return JSON.parse(event.content)
    } catch (error) {
      console.log('error in parsing metadata event content :>> ', error)
      return null
    }
  }
}