// ── Core's own event actions ───────────────────────────────────────────────
//
// EVENTS.md §F, and Phase 1 of EVENTS_PLAN.md. The twin of config/coreTriggers.js
// and registered through the same staging area a module will use in Phase 7 —
// which is the entire reason these three exist this early. A registry whose first
// real registrant is a module is a registry that has already drifted, and §F's
// claim that core is "an event engine that can announce, wait, cue a human and
// publish results" with NO module installed is only true if core declares the
// verbs that do it.
//
// **Three actions, and between them they cover the three things an event can do
// that name no game noun at all**: tell people something, let time pass, and ask
// a human to go and do something. A deployment with no game module installed has
// a working event system made of exactly these.
//
// **Phase 8 added a fourth, and it is the odd one out on purpose.** `core.lease`
// names no game noun either — it borrows a value some module declared — but
// unlike the other three it genuinely changes the world, so it is `risk: 'change'`
// and therefore default-off, admin-only and cap-checked like any module verb.
// It is CORE's rather than each module's because §F puts the duration bound and
// the two-events-one-target conflict check on core's side of the seam: a lease
// verb per module would be that bound re-implemented once per module, advisory
// everywhere, and wrong in the first one that forgot it.
//
// **Phase 10 added the last two, and they are the integrations** (EVENTS.md
// §J). `core.announce.post` sends an ARTICLE rather than a line — it links a
// post an editor already wrote and queues it through `announce_jobs`, so the
// town crier and Discord arrive as already-registered legs with their retry and
// their classification rather than as a second delivery pipeline. And
// `core.results.publish` is what makes §F's "publish results" literal: it ranks
// the run's participants and stamps the table published. Both name a game noun
// nowhere, which is why they are core's; six actions is now the whole of what an
// event can do on a deployment with no game module installed at all.
//
// **Phase 2 gave all three real bodies**, and between them they exercise every
// shape §F's envelope can take: `core.announce` does work and finishes,
// `core.wait` finishes while deferring what follows it, and `core.cue` succeeds
// without finishing at all. The runner learns nothing about any of them by id —
// each says what it needs in the envelope, through the same two members Phase 7
// hands to a module.
//
// **This file must not touch the database.** It is required from `registerCore()`,
// which runs under `routeManifest.js` and `swagger.js` against a dead pool
// (MODULE_API.md §2.2). Nothing below runs at require time; the announce leg is
// looked up inside `perform()`, per call, which is also what makes a leg
// registered by a module that booted later reachable at all. `core.lease` is the
// one action here that reaches a table, and it requires the model INSIDE
// `perform()` for the same reason — a top-level require would make this file
// build a pool during route-manifest generation.

const registries = require('../modules/registries')

// `event_run_resources.ref` is VARCHAR(190). A targeted lease composes its ref
// from the lease id and the target, so this is the one place a caller can push a
// ref past the column — and the ledger's own rule applies: refuse, never
// truncate, because a truncated ref is a restore pointed at another object.
const MAX_LEASE_REF = 190


/**
 * Turn the `value` param's text into whatever the named lease says it holds.
 *
 * The range check is here too, and it is REQUIRED on the numeric types for the
 * reason §F gives: unlike a cap, a bad lease value is in force the moment it is
 * applied, so "0.5 to 5" is not advice.
 */
function coerceLeaseValue(lease, raw) {
  const text = String(raw === undefined || raw === null ? '' : raw).trim()
  if (lease.type === 'string') {
    // A string lease with a declared value set is bounded here, at authoring
    // time, exactly as a numeric one is by its range (Phase 12b). Without it the
    // only check on the value is the game side's, and that refusal arrives
    // unattended, mid-run, from a step nobody is watching.
    if (lease.values && !lease.values.includes(text)) {
      return {
        ok: false,
        error: `${lease.label} accepts ${lease.values.join(', ')}, and "${raw}" is none of them`,
      }
    }
    return { ok: true, value: text }
  }
  if (lease.type === 'bool') {
    if (['true', '1', 'yes', 'on'].includes(text.toLowerCase())) return { ok: true, value: true }
    if (['false', '0', 'no', 'off'].includes(text.toLowerCase())) return { ok: true, value: false }
    return { ok: false, error: `"${raw}" is not a yes or no value for ${lease.label}` }
  }
  const n = Number(text)
  if (text === '' || !Number.isFinite(n)) {
    return { ok: false, error: `"${raw}" is not a number, and ${lease.label} holds one` }
  }
  if (lease.type === 'int' && !Number.isInteger(n)) {
    return { ok: false, error: `${lease.label} holds a whole number, and "${raw}" is not one` }
  }
  if (n < lease.min || n > lease.max) {
    return { ok: false, error: `${lease.label} accepts ${lease.min} to ${lease.max}, and "${raw}" is outside that` }
  }
  return { ok: true, value: n }
}

const ACTIONS = [
  {
    id: 'core.announce',
    label: 'Announce',
    description:
      'Publish a line of text to an announce leg — Discord, the in-game town crier, or any leg a module has registered.',

    // Nothing in the world changes and nothing is created: a message goes out.
    // That is what makes the default `on_failure` for this step `retry -> skip`
    // (§L) rather than `pause`, and it is the honest class even though the
    // message itself cannot be unsent.
    risk: 'notify',
    // A sent announcement is gone. `none` rather than `ledger` is not an
    // omission — there is no undo to write, and declaring `ledger` would put a
    // row in the cleanup ledger that teardown could never resolve.
    reversible: 'none',
    version: 1,

    params: [
      {
        // A leg id, checked against the announce-leg registry at dispatch rather
        // than here: legs are registered by modules, and this file is evaluated
        // before any module has registered anything.
        //
        // **`source` is what moves that check earlier** (Phase 7). The dispatch
        // check stays — a module can boot between authoring and the run — but
        // until now a typo here was caught mid-run and nowhere else, which is the
        // defect Phase 6's walk hit: an announce leg "site" no module registers,
        // found by a dry run rather than by the form that accepted it.
        name: 'leg',
        type: 'string',
        required: true,
        example: 'discord',
        source: 'core.options.legs',
        description: 'The announce leg to publish on. Registered legs only.',
      },
      {
        name: 'title',
        type: 'string',
        required: false,
        example: 'The gates of Britain open at dusk',
        description: 'Optional heading, for legs that render one.',
      },
      {
        name: 'body',
        type: 'string',
        required: true,
        example: 'A caravan has been sighted on the road east of Cove.',
        description: 'The announcement itself. Plain text.',
      },
    ],

    /**
     * Publish through the announce leg the step names.
     *
     * **The legs are reused rather than reimplemented** (§J, "reuse the legs"):
     * `discord` is core's and `towncrier` is module-uo's, both already registered,
     * both already carrying a `classify()` that knows what their transport's
     * failures mean. An event announcement that went out by some other path would
     * be a second delivery mechanism with its own bugs.
     *
     * A leg's `dispatch()` takes a POST — that is the shape the news path gave it
     * — so an event announcement is presented as one. `excerpt` is the body
     * because it is the field every leg renders as prose, and `image_url` is null
     * because an event announcement has no article behind it to illustrate.
     * Widening the leg contract to carry a second payload shape is a
     * MODULE_API change, and Phase 7 is where those are made.
     *
     * The leg id is checked HERE rather than at authoring time, and that is not
     * laxness: legs are registered by modules, and a spec is validated in a
     * process that may have booted before the module that owns the leg.
     */
    async perform({ params, verify }) {
      const registered = registries.announceLeg(params.leg)
      if (!registered) {
        // Terminal, not transient. A leg nobody registers will not appear
        // between two attempts sixty seconds apart, and the honest cause — a
        // module removed, or a typo the authoring form could not catch — is a
        // thing a human fixes.
        return { ok: false, retry: false, error: `no module registers the announce leg "${params.leg}"` }
      }
      // A dry run reports what it WOULD do and sends nothing (§I). Answering
      // before the dispatch rather than inside the leg is what keeps that true
      // for legs written by people who never read this file.
      if (verify) return { ok: true }

      const result = await registered.dispatch({
        title: params.title || null,
        excerpt: params.body,
        image_url: null,
      })
      // The leg's own classification, not a second opinion. `retry` vs
      // `terminal` for a Discord webhook is a judgement `discordAnnounce.classify`
      // already makes, and making it twice is how the two drift.
      const { outcome, error } = registered.classify(result)
      if (outcome === 'done') return { ok: true }
      return { ok: false, retry: outcome === 'retry', error: error || `announce leg "${params.leg}" refused` }
    },
  },

  {
    id: 'core.wait',
    label: 'Wait',
    description: 'Let a fixed amount of time pass before the next step of this phase runs.',

    // `inspect` rather than `notify`: nothing is sent and nobody is told. It is
    // the weakest class the closed set has for an action that is not a broadcast.
    risk: 'inspect',
    reversible: 'none',
    version: 1,

    params: [
      {
        name: 'seconds',
        type: 'int',
        required: true,
        example: 300,
        description: 'How long to wait. The runner sets the next step due_at from this.',
      },
    ],

    // A wait is a genuine no-op at dispatch, and it stayed one: the delay is the
    // NEXT step's `due_at`, which the runner owns, not something this function
    // sleeps through. A `perform` that slept would hold a step's claim for the
    // duration and turn a five-minute pause into a five-minute lease — and the
    // reclaim would then re-dispatch it, so a long enough wait would never end.
    //
    // `holdFor` is an ordinary envelope member (org lead, 2026-09-02), which is
    // why the runner can honour this without knowing what `core.wait` is.
    async perform({ params, verify }) {
      if (verify) return { ok: true }
      return { ok: true, holdFor: params.seconds }
    },
  },

  {
    id: 'core.cue',
    label: 'Cue a human',
    description:
      'Post an instruction for staff and wait for someone to confirm it was done before the run advances.',

    // The action itself only posts an instruction. Whatever the human then does
    // is outside this system entirely, which is precisely why the cue exists:
    // it is how an event uses a capability no module has automated.
    risk: 'notify',
    reversible: 'none',
    version: 1,

    params: [
      {
        name: 'instruction',
        type: 'string',
        required: true,
        example: 'Open the north gate and read the herald script in Britain bank.',
        description: 'What the staff member is being asked to do.',
      },
      {
        name: 'assignee',
        type: 'string',
        required: false,
        example: 'Event Team',
        description: 'Who the cue is addressed to. A label, not an account.',
      },
    ],

    /**
     * Post the instruction and PARK. The step does not complete here.
     *
     * `await: 'human'` is the envelope member that says so (org lead,
     * 2026-09-02), and the runner's answer to it is to leave the step `running`
     * with a NULL lease — genuinely in flight, nothing holding it, so the stale
     * reclaim passes it by and a cue posted on Friday is still waiting on Monday.
     * The step ends when someone presses confirm, which is Phase 3's control.
     *
     * **Nothing is delivered from here in Phase 2, and that is visible rather
     * than pretended.** The instruction is carried by the step's own params and
     * shown on the run console; routing it to Discord or to a staff inbox is
     * Phase 10's integration work, through the engagement triggers that own every
     * other notification on this platform. An action that grew its own delivery
     * path would be the second one.
     */
    async perform({ verify }) {
      if (verify) return { ok: true }
      return { ok: true, await: 'human' }
    },
  },

  {
    id: 'core.lease',
    label: 'Borrow a value',
    description:
      'Hold a module-declared value at a new setting for a bounded time, and put the old one back at teardown.',

    // The world changes and it changes back, so `change` rather than
    // `irreversible` — and `change`'s default `on_failure` is `pause`, which is
    // the right stop for a run that failed halfway through altering the world.
    risk: 'change',
    // The one action core ships in this class. `override` is what tells the
    // cleanup sweep to restore through the LEASE registry rather than through an
    // action's `revert()`, which is why this action needs no `revert()` of its own
    // and why the registry refuses one on it.
    reversible: 'override',
    version: 1,

    params: [
      {
        name: 'lease',
        type: 'string',
        required: true,
        example: 'uo.rate.skillgain',
        source: 'core.options.leases',
        description: 'Which declared value to borrow.',
      },
      {
        // **A string, and the coercion is here rather than in the type system.**
        // A param declares ONE type; a lease declares its own, and they are four
        // different ones. Typing this `float` would make a boolean lease
        // unauthorable and a string lease nonsense, so the field takes text and
        // this action turns it into whatever the named lease said it holds — the
        // one place that knows both halves.
        name: 'value',
        type: 'string',
        required: true,
        example: '3.0',
        description: 'What to hold it at, in whatever type the lease declares.',
      },
      {
        // **Optional here, required by the LEASE** (Phase 12b), and the two are
        // not the same statement. A param's `required` is a property of the
        // action, and this action serves both a config key (which has no target)
        // and an object property (which cannot be named without one) — so the
        // field is declared optional and `perform` refuses a targeted lease with
        // nothing in it, in the lease's own words.
        //
        // It carries no `source` for the same reason: the values behind it are
        // the chosen LEASE's, and a param declares one source for all time. The
        // lease's own `target.source` is what the authoring form reads once the
        // author has picked a lease, which is the only moment the right list is
        // knowable.
        name: 'target',
        type: 'string',
        required: false,
        example: '003f11b8-9bfa-4587-991e-ca263004efe6',
        description: 'Which one, for a value that exists on many things. Leave empty otherwise.',
      },
      {
        name: 'minutes',
        type: 'int',
        required: true,
        example: 120,
        description: 'How long to hold it. Core refuses more than the lease allows.',
      },
    ],

    // What a lease costs is the LEASE's business to bound, not a budget's:
    // `maxDurationMs` and the numeric range are declared beside the callables and
    // enforced below. A cap dimension here would be core inventing an accounting
    // unit for something a module already bounds — and `registerEventBudgets`
    // refuses a dimension nobody declared, which is exactly the rule that would
    // then bite core's own action.

    /**
     * Read the baseline, reserve the target, apply the value.
     *
     * **This is rule 1 in its strongest form.** Unlike a spawn, a lease's target
     * is knowable before the dispatch — it is the lease id the step names — so
     * the ledger row is written with its real `kind` and `ref` BEFORE anything
     * touches the world, and the two-events-one-target refusal comes from the
     * unique index at that moment rather than from a check that read and then
     * wrote. A second run asking for a lease another run holds comes back
     * `refused`, in the same words a cap breach uses and for the same reason:
     * nothing is broken, the deployment already has that value spoken for.
     *
     * The order is read then reserve then apply, and a failure at each stage
     * undoes the one before it: a reservation whose `apply` refuses is released
     * here rather than left for the sweep, because there is nothing out there to
     * give back and a shard that is merely down must not lock a lease out for the
     * length of a retry cycle.
     */
    async perform({ runId, stepId, params, verify }) {
      // eslint-disable-next-line global-require
      const resourcesDb = require('../model/events/eventRunResources.db')
      const lease = registries.eventLease(params.lease)
      if (!lease) {
        return { ok: false, retry: false, error: `no module registers the lease "${params.lease}"` }
      }

      const coerced = coerceLeaseValue(lease, params.value)
      if (!coerced.ok) return { ok: false, retry: false, error: coerced.error }

      // **The target is checked before anything else about the world is read**
      // (Phase 12b), because both of its failures are authoring mistakes rather
      // than outages: a targeted lease with no target names nothing, and a target
      // on a lease that has none is an author who has confused two fields. Both
      // are `retry: false` — the second attempt has the same params.
      const targetRaw = params.target === undefined || params.target === null ? '' : String(params.target).trim()
      if (lease.target && !targetRaw) {
        return { ok: false, retry: false, error: `${lease.label} needs a ${lease.target.label.toLowerCase()}` }
      }
      if (!lease.target && targetRaw) {
        return { ok: false, retry: false, error: `${lease.label} is a single value and takes no target` }
      }
      const target = lease.target ? targetRaw : null
      const ref = registries.leaseRef(lease.id, target)
      // Refused rather than truncated, on the ledger's own rule for a resource
      // ref: a truncated ref is a restore pointed at the wrong object.
      if (ref.length > MAX_LEASE_REF) {
        return { ok: false, retry: false, error: `that target is too long to record (${ref.length} of ${MAX_LEASE_REF})` }
      }

      const minutes = Number(params.minutes)
      if (!Number.isFinite(minutes) || minutes <= 0) {
        return { ok: false, retry: false, error: `"${params.minutes}" is not a number of minutes` }
      }
      const ms = Math.round(minutes * 60_000)
      if (ms > lease.maxDurationMs) {
        return {
          ok: false,
          retry: false,
          error: `${lease.label} may be held for at most ${Math.floor(lease.maxDurationMs / 60_000)} minutes, not ${minutes}`,
        }
      }

      // **The dry run stops here, and it has still checked everything worth
      // checking**: the lease exists, the value is in range and the duration is
      // allowed. What it deliberately does not do is reserve the target — a
      // verify that took a lease would be a dry run that changed something, and
      // it would then refuse the real run that followed it.
      //
      // It also does not check that the TARGET exists, and that is the same
      // rule rather than an exception: asking the game side whether a spawner is
      // there is a live read the shard may be down for, and a dry run that fails
      // because a shard is restarting would make `verified_at` a property of the
      // moment rather than of the version (§K).
      if (verify) return { ok: true }

      const baseline = await lease.read({ target })
      if (!baseline || baseline.ok !== true) {
        return {
          ok: false,
          error: baseline && baseline.error
            ? String(baseline.error)
            : `could not read the current value of ${lease.label}`,
        }
      }

      const until = new Date(Date.now() + ms)
      const reserved = await resourcesDb.reserve({
        runId,
        stepId,
        owner: lease.owner || 'core',
        kind: 'override',
        // **The ref carries the target, and that is what makes the unique index
        // right rather than merely present.** Reserved under the lease id alone,
        // an event turning up one spawner would lock every other run out of every
        // other spawner — a conflict check that refuses correct work is as wrong
        // as one that permits a collision, and on a shard with 6,707 spawners it
        // is the failure an operator would actually meet.
        ref,
        payload: {
          target: ref,
          leaseTarget: target,
          baseline: baseline.value,
          applied: coerced.value,
          until: until.toISOString(),
        },
        leaseUntil: until,
      })
      if (!reserved.ok) {
        const heldBy = reserved.holder ? ` (run ${reserved.holder.run_id})` : ''
        return {
          ok: false,
          retry: false,
          error: `${lease.label} is already leased by another run${heldBy}`,
        }
      }

      // **`until` goes down the wire** (§F). The module passes it to its sidecar
      // and the game side restores baseline when it passes, without being asked
      // again — the fail-safe that makes an unattended, scheduled world change
      // defensible, because the worst case is a world back at baseline early
      // rather than one stuck changed indefinitely.
      let applied
      try {
        applied = await lease.apply(coerced.value, until, { target })
      } catch (err) {
        applied = { ok: false, error: err.message }
      }
      if (!applied || applied.ok !== true) {
        await resourcesDb.markReverted(reserved.id)
        return { ok: false, error: applied && applied.error ? String(applied.error) : `${lease.label} refused the new value` }
      }

      await resourcesDb.confirm(reserved.id)
      // **The run now owes the world something, and something has to say so.**
      // The generic path marks a run dirty when it records a module's reported
      // resources; this action reserves its own row and never goes through it, so
      // a run whose only resource was a lease would have kept `cleanup_status =
      // 'not_required'` and never been swept. Found by the live walk, and the
      // cleanup leg's own scan was widened to make the class impossible rather
      // than only this instance.
      // eslint-disable-next-line global-require
      await require('../events/ledger').markRunDirty(runId)
      return { ok: true }
    },

    /**
     * Which of this run's leases the game side still has a record of (Phase 11b).
     *
     * **A lease row had no reconcile path at all until this existed**, and nothing
     * failed to say so. `cleanup.js` resolves a resource to the action of the step
     * that made it, and for a lease that action is `core.lease` — a CORE action, on
     * a path a module cannot register anything on. So every `override` row came
     * back `unanswered` for the life of the run, and a lease the shard had quietly
     * dropped (a restart reverts every config lease, by design) stayed in the
     * ledger as live until teardown went looking for a baseline nobody was holding.
     *
     * The question asked is deliberately NOT "is the value still what we applied".
     * That is drift, and drift is teardown's verdict to deliver through `restore`
     * so the row lands as `drifted` with the current value beside it. A reconcile
     * that inferred absence from a changed value would orphan the row first and
     * throw that away — the operator would be told the lease vanished rather than
     * that somebody moved it.
     *
     * A lease with no `inForce()` is reported in force, which is core's posture
     * everywhere else in this file: "I could not ask" must never be recorded as
     * "it is gone".
     */
    async reconcile({ resources }) {
      const inForce = []

      for (const row of resources || []) {
        if (row.kind !== 'override') continue

        // Resolved through the ref parser rather than by a bare map lookup: a
        // targeted row's ref is `<id>#<target>` and `eventLease` would miss it,
        // which would silently report every property lease still in force.
        const found = registries.eventLeaseForRef(row.ref)
        const lease = found && found.lease

        if (!lease || typeof lease.inForce !== 'function') {
          inForce.push(row.ref)
          continue
        }

        let answer
        try {
          answer = await lease.inForce({ ref: row.ref, target: found.target, payload: row.payload || null })
        } catch (err) {
          answer = null
        }

        // Only an explicit `held: false` takes a row out. A module that threw, timed
        // out, or answered something unrecognisable has not said the lease is gone.
        if (answer && answer.ok === true && answer.held === false) continue

        inForce.push(row.ref)
      }

      return { ok: true, inForce }
    },
  },

  {
    id: 'core.announce.post',
    label: 'Announce a post',
    description:
      'Send an existing news post out on every registered announce leg — Discord, the in-game town crier — as this run\'s announcement.',

    // Nothing in the world changes and nothing is created; a message goes out.
    // Same class as `core.announce` and for the same reason.
    risk: 'notify',
    // The job is queued, the legs deliver, and none of it can be unsent. A
    // `ledger` here would put a row in the cleanup ledger that teardown could
    // never resolve.
    reversible: 'none',
    version: 1,

    // **`core.announce` sends a line; this sends an ARTICLE**, and that is the
    // whole difference between them (EVENTS.md §J, "News"). Events does not
    // write posts — `ctx.posts` is read-only to modules and the CMS is core's —
    // so an event that wants prose, an image and a permanent page links a post
    // an editor already wrote. What this action adds over `core.announce` is
    // therefore not a second transport but a second SHAPE: every leg's
    // `dispatch()` takes a post, and this is the one that hands it a real one.
    params: [
      {
        name: 'postId',
        type: 'int',
        required: true,
        example: 412,
        source: 'core.options.posts',
        description: 'The published post to announce. Any category.',
      },
    ],

    /**
     * Queue the post on every registered leg, as this run's announcement.
     *
     * **The refusals are all `retry: false`**, and each is a thing a human has to
     * fix: a post id that names nothing, or a draft. Neither will have changed
     * sixty seconds later, and retrying would spend two more attempts before
     * saying the same thing.
     *
     * **What it does NOT wait for is delivery.** `enqueueForRun` writes the job
     * and the legs and returns; `announceWorker` drains them on its own tick with
     * its own backoff. So this step is `done` when the announcement is queued,
     * not when Discord has it — which is honest, because a leg that fails after
     * six attempts over two hours is not something a step could usefully have
     * stayed open for, and the post admin panel is where that failure is already
     * surfaced.
     */
    async perform({ runId, params, verify }) {
      /* eslint-disable global-require */
      const posts = require('../model/posts/posts.model')
      const announceJobs = require('../model/announceJobs/announceJobs.model')
      /* eslint-enable global-require */

      const postId = Number(params.postId)
      if (!Number.isInteger(postId) || postId < 1) {
        return { ok: false, retry: false, error: `"${params.postId}" is not a post id` }
      }

      const post = await posts.getById(postId)
      if (!post) return { ok: false, retry: false, error: `no post with id ${postId}` }
      if (!post.published) {
        // A draft has no public page for a town-crier line to point at, and
        // announcing one would publish its title to a shard before an editor
        // meant to. Refused rather than published on the author's behalf:
        // publishing is the CMS's decision and this action is not it.
        return { ok: false, retry: false, error: `"${post.title}" is not published` }
      }

      // The dry run has now checked everything worth checking — the post exists
      // and is published — and queues nothing. Checked BEFORE the legs are read,
      // because a deployment with no leg registered is a real state and a verify
      // that reported it as a failure would refuse a plan that is fine.
      if (verify) return { ok: true }

      await announceJobs.enqueueForRun(postId, runId)
      return { ok: true }
    },
  },

  {
    id: 'core.results.publish',
    label: 'Publish the results',
    description:
      'Rank this run\'s participants by score and publish the results table.',

    // Nothing in the game world changes and nobody is messaged: a table core
    // already holds becomes readable. `inspect` is the weakest class the closed
    // set has and it is the honest one — which also means this action is
    // default-ON like `core.wait`, and an author can place it without an admin
    // first visiting the switchboard.
    risk: 'inspect',
    // **`none`, and it is worth saying why a publication is not reversible.**
    // Nothing is created that core would have to come back for; un-publishing is
    // an admin decision about a table, not a teardown obligation, and a `ledger`
    // row here would make every completed event carry an outstanding resource
    // for ever.
    reversible: 'none',
    version: 1,

    // No params. What is published is this run's participants, which is the only
    // set there is — a param naming which run would be a way to publish someone
    // else's results from inside your own event.
    params: [],

    /**
     * Rank, stamp, and say how many.
     *
     * **Idempotent by construction**, which is what makes it safe as an ordinary
     * retried step: ranking is a total order over `(score, joined_at, id)`, so
     * running it twice over an unchanged table writes the same numbers, and the
     * stamp simply moves. A late participant added by a second collect step and
     * a re-publish afterwards renumbers deliberately — that is the operator
     * asking for exactly that.
     *
     * **A run with no participants publishes an empty table rather than
     * failing.** "Nobody was recorded" is a true and renderable result, and it is
     * the state of every run until a module can source attendance at all (Phase
     * 12). Failing here would make an event whose module reports nothing look
     * broken on the console for a reason that has nothing to do with the event.
     */
    async perform({ runId, verify }) {
      /* eslint-disable global-require */
      const participantsDb = require('../model/events/eventRunParticipants.db')
      const runsDb = require('../model/events/eventRuns.db')
      /* eslint-enable global-require */

      if (verify) return { ok: true }

      await participantsDb.rankRun(runId)
      await runsDb.markResultsPublished(runId)
      return { ok: true }
    },
  },
]

// ── Core's own param option sources (§F, Phase 7) ──────────────────
//
// One, and it is core's half of the seam it hands a module on the same boot: a
// param's `source` names a registered option source, core asks it for values, and
// the authoring form renders a dropdown instead of a text box.
//
// **The legs are already a registry with labels in it**, so this costs nothing
// new — which is what makes it the right first exercise. `resolve()` is called
// per request rather than read once, for the same reason `core.announce` looks a
// leg up inside `perform()`: a leg registered by a module that booted after this
// file was evaluated must still appear, and a module uninstalled since must stop
// appearing.
const OPTION_SOURCES = [
  {
    id: 'core.options.legs',
    label: 'Announce legs',
    description: 'Every delivery leg registered on this deployment right now.',
    async resolve() {
      return registries.announceLegs().map((l) => ({ value: l.leg, label: l.label || l.leg }))
    },
  },
  {
    id: 'core.options.leases',
    label: 'Borrowable values',
    description: 'Every value a module has declared this deployment may lease.',
    async resolve() {
      return registries
        .allEventLeases()
        .map((l) => ({ value: l.id, label: l.label, group: l.id.split('.')[0] }))
    },
  },
  {
    id: 'core.options.posts',
    label: 'Published posts',
    description: 'Every published post an event may announce, newest first.',
    /**
     * **The one option source in core that reaches a table**, and the reason it
     * is allowed to is the rule §F draws about WHEN: a source resolves on its own
     * request (`GET /admin/events/catalog/options/:sourceId`), which is a live
     * request on a booted server, not at `register()` time under a dead pool.
     *
     * Grouped by category so the dropdown separates news from the newsletter
     * rather than presenting one long list in which the two are indistinguishable
     * — a `group` is what the form renders as an optgroup, and it costs a column
     * that is already selected.
     */
    async resolve() {
      // eslint-disable-next-line global-require
      const postsDb = require('../model/posts/posts.db')
      const rows = await postsDb.listPublishedForOptions(200)
      return rows.map((p) => ({ value: p.id, label: p.title, group: p.category }))
    },
  },
]

module.exports = { ACTIONS, OPTION_SOURCES }