// ── 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 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.

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

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.
        name: 'leg',
        type: 'string',
        required: true,
        example: 'discord',
        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' }
    },
  },
]

module.exports = { ACTIONS }