import { NDKRelaySet, NDKSubscription } from '@nostr-dev-kit/ndk'
import { writable, type Unsubscriber, type Writable } from 'svelte/store'
import { base_relays, ndk } from './ndk'
import type { Repo } from '$lib/components/repo/type'
import { defaults } from '$lib/components/repo/type'
import type { User } from '$lib/components/users/type'
import { ensureUser } from './users'
import { repo_kind } from '$lib/kinds'

export const selected_repo: Writable<Repo> = writable({ ...defaults })
let selected_repo_id: string = ''

let maintainers_unsubscribers: Unsubscriber[] = []

let sub: NDKSubscription
export const ensureSelectedRepo = async (repo_id: string): Promise<Repo> => {
  if (selected_repo_id == repo_id) {
    return new Promise((r) => {
      const unsubscriber = selected_repo.subscribe((repo) => {
        if (repo.repo_id === repo_id && !repo.loading) {
          setTimeout(() => {
            unsubscriber()
          }, 5)
          r({ ...repo })
        }
      })
    })
  }
  selected_repo_id = repo_id

  if (sub) sub.stop()
  sub = ndk.subscribe(
    {
      kinds: [repo_kind],
      '#d': [repo_id],
      limit: 1,
    },
    {
      closeOnEose: false,
    },
    NDKRelaySet.fromRelayUrls(base_relays, ndk)
  )

  return new Promise((r) => {
    sub.on('event', (event) => {
      try {
        if (event.kind == repo_kind && event.tagValue('d') == repo_id) {
          selected_repo.set({
            loading: false,
            repo_id: event.replaceableDTag(),
            name: event.tagValue('name') || '',
            description: event.tagValue('description') || '',
            git_server: event.tagValue('git-server') || '',
            tags: event.getMatchingTags('t') || [],
            maintainers: event.getMatchingTags('p').map(
              (t: string[]) =>
                ({
                  hexpubkey: t[1],
                  loading: true,
                  npub: '',
                }) as User
            ),
            relays: event.getMatchingTags('relay').map((t: string[]) => t[1]),
          })
          const old_unsubscribers = maintainers_unsubscribers
          maintainers_unsubscribers = event
            .getMatchingTags('p')
            .map((t: string[]) => {
              return ensureUser(t[1]).subscribe((u: User) => {
                selected_repo.update((repo) => {
                  return {
                    ...repo,
                    maintainers: repo.maintainers.map((m) => {
                      if (m.hexpubkey == u.hexpubkey) return { ...u }
                      else return { ...m }
                    }),
                  }
                })
              })
            })
          old_unsubscribers.forEach((unsubscriber) => unsubscriber())
        }
      } catch {}
    })

    sub.on('eose', () => {
      selected_repo.update((repo) => {
        r({
          ...repo,
          loading: false,
        })
        return {
          ...repo,
          loading: false,
        }
      })
    })
  })
}