// ── Shard event → push fan-out ─────────────────────────────────────────────
//
// MODULE-UO CONTENT, still living in core — the inverted half of
// MODULE_SYSTEM.md §1.8's second entangled file. `utils/pushDispatch.js` is core
// infrastructure, but its `fromShardEvent()` required the shardLinks model and
// the shard event mapper, which is a core file importing content. PR 4 inverted
// it: `publish()` stays core, and this — the thing that knows what a shard event
// is — moved out to call it. Phase 3 moves this file to module-uo whole, where it
// will reach `publish` through `ctx.push.publish` instead of a require.
//
// Owner resolution is the reason this cannot just be a mapper: a personal
// (owner-keyed) target names a GAME account, and turning that into a website user
// needs the shardLinks model. An unlinked account is simply nobody to notify.

const shardLinks = require('../model/shardLinks/shardLinks.model')
const { mapShardEvent } = require('../config/shardStreams')
const { push } = require('../core')

const { publish } = push
const log = require('../core').logger('shard-push')

// Fan a shard event out to push. Resolves personal (owner-keyed) targets to the
// owning website user via shardLinks (an unlinked account → nobody to notify).
// Never throws — a dead relay must never affect ingest.
async function fromShardEvent(event, deps = {}) {
  const links = deps.shardLinks || shardLinks
  const doPublish = deps.publish || publish
  const targets = mapShardEvent(event, deps.tracker)
  for (const t of targets) {
    try {
      if (t.ownerAccount) {
        let owner = null
        try {
          owner = await links.getByAccount(t.ownerAccount)
        } catch {
          owner = null
        }
        if (!owner || owner.userId == null) continue
        await doPublish(t.streamId, { ref: t.ref, ownerUserId: owner.userId }, deps)
      } else {
        await doPublish(t.streamId, { ref: t.ref }, deps)
      }
    } catch (err) {
      log.warn('push dispatch target failed', { streamId: t.streamId, message: err.message })
    }
  }
}

module.exports = { fromShardEvent }