// ── onBoot / onShutdown ────────────────────────────────────────────────────
//
// The eight UO call sites that used to sit in core's `server.js`. `register()`
// runs with no database (MODULE_API.md §2.2); everything here runs with one.
//
// Core dispatches `onBoot` after `ensureSchema` and the schema-fragment replay,
// and **before the HTTP listener binds** — so the tables these functions touch
// exist, and nothing is served until the warm-up finishes. That ordering is the
// contract's promise rather than an accident, and it is why `onBoot` has no
// timeout: a module that must not serve traffic until a cache is warm only gets
// that guarantee if the listener is still closed.
//
// **One behavioural change, and it is deliberate.** In core, `uoLinkSocket.start()`
// and the sidecar health probe ran AFTER the listener bound; here they run before
// it. `start()` returns as soon as the reconnecting client is armed, so that part
// is free — but the probe is a real HTTP call to the sidecar, and an unreachable
// sidecar must not hold the site closed. It is therefore fired and NOT awaited,
// with its own catch. Reporting whether the bridge is up is diagnostics; being up
// is not a precondition for serving a page, and the site is required to degrade
// gracefully when the shard is down.
//
// Everything here is best-effort by the same rule. A module whose `onBoot`
// throws is marked `startup_failed` and its routes answer 503 (§4.4), which is
// the right outcome for a broken module — but "the operator has not configured a
// ServUO path" is not a broken module, and neither is "the shard is offline".

const core = require('./core')

const uoLinkSocket = require('./utils/uoLinkSocket')
const uoLinkClient = require('./utils/uoLinkClient')
const uoLinkConfig = require('./model/uoLinkConfig/uoLinkConfig.model')
const shardBroadcast = require('./utils/shardBroadcast')
const shardAtlas = require('./model/shardAtlas/shardAtlas.model')
const shardClilocs = require('./model/shardClilocs/shardClilocs.model')
const shardMarket = require('./model/shardMarket/shardMarket.model')

/**
 * Best-effort startup probe of the uo-link sidecar.
 *
 * Logs whether it is reachable and warns loudly on a protocol mismatch —
 * fail-fast visibility rather than silently mis-parsing a newer wire format.
 * Never throws, and is never awaited by `onBoot`.
 */
async function checkUoLink() {
  const log = core.logger('boot')
  const config = await uoLinkConfig.getSafe()
  if (!config.enabled) return
  const health = await uoLinkClient.health()
  if (!health.ok) {
    log.warn('uo-link is enabled but the sidecar is unreachable at startup', {
      baseUrl: config.baseUrl,
      error: health.error || `status ${health.status}`,
    })
    return
  }
  if (health.data && health.data.protocol && health.data.protocol !== config.protocol) {
    log.error('uo-link PROTOCOL MISMATCH — pinned vs sidecar', {
      pinned: config.protocol,
      sidecar: health.data.protocol,
    })
  } else {
    log.info('uo-link sidecar reachable', {
      pluginConnected: health.data && health.data.plugin_connected,
      protocol: health.data && health.data.protocol,
    })
  }
}

async function onBoot() {
  const log = core.logger('boot')

  // Re-derive the spawn atlas from the shard's own ServUO tree. The shard's maps
  // change over its lifetime — facets get added, replaced or renamed — so the
  // atlas is rebuilt on every boot rather than shipped as a snapshot that would
  // silently go stale. Hash-gated, so an unchanged tree costs one read pass and
  // no database write.
  //
  // Best-effort by contract: no configured path, an unreadable mount or a
  // malformed file must never stop the site coming up. A refresh that would
  // REMOVE a facet is staged for admin approval instead of being applied.
  await shardAtlas.refreshOnBoot()

  // Refresh the cliloc table (UO's id → display-string map) from the file the
  // operator converted out of their own client. Same contract as the atlas:
  // hash-gated so an unchanged file costs one read, and best-effort so a missing
  // or wrong-format file never stops the site coming up — it just means item
  // names render as ids, which is what they did before the table existed.
  const clilocResult = await shardClilocs.refreshOnBoot()

  // A cliloc import changes what item names RESOLVE to, and the marketplace
  // stores those names denormalized (shard_vendor_items.display_name) so it can
  // index and search them. The shard's market sweep will not re-send an unchanged
  // shop just because the site learned what its items are called, so the backfill
  // has to be pulled rather than waited for. Only after an actual import — the
  // common boot is hash-gated to a no-op and must stay one.
  if (clilocResult && clilocResult.status === 'imported') await shardMarket.refreshDisplayNames()

  // Start the uo-link WebSocket ingest client. Self-guards: it only actually
  // connects when the admin has enabled the integration and saved a token, so
  // this is a no-op on shards that haven't configured the sidecar.
  try {
    await uoLinkSocket.start()
  } catch (err) {
    log.warn('uo-link socket failed to start (continuing)', { error: err.message })
  }

  // Deliberately not awaited — see the header. An unreachable sidecar would
  // otherwise hold the listener closed for the length of an HTTP timeout.
  checkUoLink().catch((err) => log.warn('uo-link startup probe failed', { error: err.message }))
}

async function onShutdown() {
  // Core runs this FIRST in its signal handler, while everything it handed over
  // still works — the pool is open, the push dispatcher is up, the SSE fan-out
  // is live. It is the only chance to close cleanly, and it is budgeted, so a
  // hook that will not let go costs five seconds rather than the whole shutdown.
  uoLinkSocket.stop() // close the uo-link WS ingest client
  shardBroadcast.closeAll() // end any open shard live-feed SSE streams
}

module.exports = { onBoot, onShutdown, checkUoLink }