// ── The trigger registry, the audience registry, and the emit path ─────────
//
// ENGAGEMENT.md Phase 2's acceptance criteria, one test apiece:
//
//   • core's triggers appear in GET /admin/engagement/triggers
//   • a module registering an un-namespaced trigger or audience fails, with the
//     holder named
//   • an audience whose module is uninstalled resolves EMPTY and dormant, never
//     an error
//   • a payload missing a `required` variable throws in dev, is dropped+logged
//     in prod
//   • engagement-triggers.json diffs zero, and is not a file that silently stops
//     checking
//
// …plus the property the org lead's §7.2 decision creates and the plan never had
// to test before: **one namespace**. A trigger id and a stream id are the same
// id, so the interesting cases are the same-owner upgrade (core's five, on every
// boot) and the cross-owner collision (a module reaching for another's).
//
// Point the DB at a closed port BEFORE requiring anything: registries.js reaches
// utils/discordAnnounce, which reaches the pool at require time.
process.env.DB_HOST = '127.0.0.1'
process.env.DB_PORT = '59999'

const { test, beforeEach, afterEach, after } = require('node:test')
const assert = require('node:assert/strict')

const registries = require('../src/modules/registries')
const engagementEmit = require('../src/utils/engagementEmit')
const ctrl = require('../src/router/v1/admin/engagement.controller')
const coreTriggers = require('../src/config/coreTriggers')
const db = require('../src/utils/db')

after(() => db.close())

// Registries are process-global by design (there is one core), so a test that
// registers has to be able to undo it.
beforeEach(() => registries._reset())
afterEach(() => registries._reset())

// NODE_ENV decides throw-vs-drop, and node:test does not set it. Every emit test
// states the posture it is testing rather than inheriting whatever the shell had.
const originalEnv = process.env.NODE_ENV
afterEach(() => {
  if (originalEnv === undefined) delete process.env.NODE_ENV
  else process.env.NODE_ENV = originalEnv
})

function mockRes() {
  return {
    statusCode: 200,
    body: null,
    status(c) { this.statusCode = c; return this },
    json(b) { this.body = b; return this },
  }
}

/** A minimal valid declaration, for the tests that are about one field. */
const decl = (over = {}) => ({
  id: 'uo.house.idoc_warning',
  label: 'House approaching collapse',
  ceiling: 'owner',
  variables: [
    { name: 'house', type: 'string', required: true, example: 'The Silver Anvil' },
    { name: 'nextStage', type: 'datetime', required: false, example: '2026-08-30T04:00:00Z' },
  ],
  ...over,
})

/** Register a batch as `owner`, the way the loader's second pass commits one. */
function register(owner, fn) {
  const api = registries.stage(owner)
  fn(api)
  registries.apply(api.staged)
}

// ── Core's own declarations ────────────────────────────────────────────────

test('every core STREAM is also a trigger, and one namespace holds both', () => {
  // §7.2's one namespace, and what Events Phase 10 taught it. Until then the two
  // sets were identical and the test asserted that; they are not identical any
  // more and were never required to be. **A stream is a push toggle and a
  // trigger is a payload contract**, and the rule is containment in one
  // direction only: an id that can be pushed must have something to say, so
  // every stream is a trigger — while a trigger that is not a stream is simply
  // one nothing wakes a phone for, which is six of the seven event triggers.
  //
  // The direction matters. A STREAM with no trigger would be a push toggle for
  // an event no rule can fire; a trigger with no stream is mail and an inbox row
  // and no tickle, which is a complete and useful notification.
  registries.registerCore()
  const triggerIds = registries.allTriggers().map((t) => t.id).sort()
  const streamIds = registries.allStreams().map((s) => s.id).sort()
  assert.deepEqual(streamIds.filter((id) => !triggerIds.includes(id)), [])
  assert.deepEqual(triggerIds, [
    'event.phase.changed', 'event.run.cancelled', 'event.run.completed',
    'event.run.ending', 'event.run.failed', 'event.run.scheduled',
    'event.run.started',
    'news.post', 'team.announcement', 'team.forum.post',
    'team.leadership.changed', 'team.member.joined',
  ])
  // The one event id that is BOTH (org lead, 2026-09-04). Push is the channel
  // that says "now", and this is the only lifecycle moment worth waking a phone
  // for. A rule naming `push` on any of the other six would enqueue a tickle
  // nobody can subscribe to — the defect the live walk found.
  assert.deepEqual(streamIds, [
    'event.run.started',
    'news.post', 'team.announcement', 'team.forum.post',
    'team.leadership.changed', 'team.member.joined',
  ])
})

test('only a stream offers the push channel, which is why run.started is one', () => {
  // eslint-disable-next-line global-require
  const prefs = require('../src/model/notificationChannelPrefs/notificationChannelPrefs.model')
  registries.registerCore()
  const byId = Object.fromEntries(prefs.catalog({ role: 'admin' }).map((i) => [i.id, i]))
  assert.ok(byId['event.run.started'].channels.includes('push'))
  assert.ok(!byId['event.run.completed'].channels.includes('push'))
  // …and a trigger-only id still reaches a person on the two content channels.
  assert.ok(byId['event.run.completed'].channels.includes('email'))
  assert.ok(byId['event.run.completed'].channels.includes('inapp'))
})

test('the four Team triggers ceiling at members — a private forum excerpt cannot be widened', () => {
  registries.registerCore()
  for (const id of ['team.member.joined', 'team.leadership.changed', 'team.forum.post', 'team.announcement']) {
    assert.equal(registries.eventTrigger(id).ceiling, 'members', id)
  }
  // News is public content, so it may reach every signed-in user — but its
  // DEFAULT is still the narrower `subscribers`, because a rule an operator has
  // not thought about should not be a newsletter to the whole site.
  const news = registries.eventTrigger('news.post')
  assert.equal(news.ceiling, 'authenticated')
  assert.equal(news.audience, 'subscribers')
})

test('every core variable carries an example — the preview and test-send depend on it', () => {
  for (const t of coreTriggers.TRIGGERS) {
    for (const v of t.variables) {
      assert.ok(v.example !== undefined && v.example !== '', `${t.id}.${v.name} has an example`)
    }
  }
})

// ── One namespace (§7.2) ───────────────────────────────────────────────────

test('the same owner may hold an id as BOTH a stream and a trigger — that is the upgrade', () => {
  register('uo', (api) => {
    api.registerNotificationStreams([{ id: 'uo.market.sale', label: 'Vendor sales' }])
    api.registerEventTriggers([decl({ id: 'uo.market.sale', label: 'Vendor sale', ceiling: 'owner' })])
  })
  assert.equal(registries.isValidStream('uo.market.sale'), true)
  assert.equal(registries.eventTrigger('uo.market.sale').ceiling, 'owner')
  assert.equal(registries.eventOwner('uo.market.sale'), 'uo')
})

test('a module cannot attach a payload contract to another owner\'s stream', () => {
  register('uo', (api) => {
    api.registerNotificationStreams([{ id: 'uo.market.sale', label: 'Vendor sales' }])
  })
  assert.throws(
    () => register('rust', (api) => api.registerEventTriggers([decl({ id: 'uo.market.sale' })])),
    // The holder is named, and so is the facet it holds it as: under one
    // namespace "no such trigger" and "that id is someone's stream" are
    // different problems with the same symptom.
    /already registered as a notification stream by "uo"/,
  )
  assert.equal(registries.eventTrigger('uo.market.sale'), null)
})

test('and the collision is symmetric — a stream cannot take another owner\'s trigger id', () => {
  register('uo', (api) => api.registerEventTriggers([decl({ id: 'uo.market.sale' })]))
  assert.throws(
    () => register('rust', (api) => api.registerNotificationStreams([{ id: 'uo.market.sale', label: 'x' }])),
    /already registered as an event trigger by "uo"/,
  )
})

test('a trigger must be namespaced under its owner, with the seven legacy ids exempt', () => {
  assert.throws(
    () => register('rust', (api) => api.registerEventTriggers([decl({ id: 'house.collapsed' })])),
    /not namespaced "rust\."/,
  )
  // The same allowlist streams use, and it has to be the same one: under one
  // namespace `idoc.warning` is a single id, so if `uo` may hold it unprefixed
  // as a stream it may hold it unprefixed as a trigger.
  register('uo', (api) => api.registerEventTriggers([decl({ id: 'idoc.warning' })]))
  assert.equal(registries.eventTrigger('idoc.warning').owner, 'uo')
})

test('an id with an underscore is legal — the grammar was relaxed, not replaced', () => {
  register('uo', (api) => api.registerEventTriggers([decl({ id: 'uo.house.idoc_warning' })]))
  assert.ok(registries.eventTrigger('uo.house.idoc_warning'))
  assert.throws(
    () => register('uo', (api) => api.registerEventTriggers([decl({ id: 'uo.House.Warning' })])),
    /bad trigger id/,
  )
})

test('nothing commits when a later claim in the same batch fails', () => {
  // A well-formed id that is not the owner's. Shape errors throw at the CALL
  // (checkTriggerShape, so the stack points at the module); this one survives to
  // apply(), which is where the all-or-nothing rule lives.
  assert.throws(() => register('uo', (api) => {
    api.registerEventTriggers([decl({ id: 'uo.a.one' }), decl({ id: 'other.thing' })])
  }), /not namespaced/)
  assert.equal(registries.eventTrigger('uo.a.one'), null)
})

// ── Declaration shape (§4.3) ───────────────────────────────────────────────

test('a ceiling is required and has no default — there is no safe value to guess', () => {
  assert.throws(
    () => register('uo', (api) => api.registerEventTriggers([decl({ ceiling: undefined })])),
    /needs a ceiling/,
  )
  assert.throws(
    () => register('uo', (api) => api.registerEventTriggers([decl({ ceiling: 'everybody' })])),
    /needs a ceiling/,
  )
})

test('a default audience wider than the ceiling is refused at registration', () => {
  assert.throws(
    () => register('uo', (api) => api.registerEventTriggers([decl({ ceiling: 'staff', audience: 'everyone' })])),
    /is not permitted by ceiling "staff"/,
  )
  // Incomparable is refused too, which is the case a total order would allow.
  assert.throws(
    () => register('uo', (api) => api.registerEventTriggers([decl({ ceiling: 'staff', audience: 'owner' })])),
    /is not permitted by ceiling "staff"/,
  )
  // Omitted, it defaults to the ceiling itself.
  register('uo', (api) => api.registerEventTriggers([decl({ ceiling: 'staff', audience: undefined })]))
  assert.equal(registries.eventTrigger('uo.house.idoc_warning').audience, 'staff')
})

test('a variable without an example is refused — that is what makes preview possible', () => {
  assert.throws(
    () => register('uo', (api) => api.registerEventTriggers([
      decl({ variables: [{ name: 'house', type: 'string', required: true }] }),
    ])),
    /needs an example/,
  )
})

test('a subjectKey naming no declared variable is refused', () => {
  assert.throws(
    () => register('uo', (api) => api.registerEventTriggers([decl({ subjectKey: 'serial' })])),
    /subjectKey "serial" is not one of its variables/,
  )
  register('uo', (api) => api.registerEventTriggers([decl({ subjectKey: 'house' })]))
  assert.equal(registries.eventTrigger('uo.house.idoc_warning').subjectKey, 'house')
})

test('kind defaults to event and only the two declared kinds are accepted', () => {
  register('uo', (api) => api.registerEventTriggers([
    decl({ id: 'uo.a.one' }),
    decl({ id: 'uo.a.two', kind: 'scheduled' }),
  ]))
  assert.equal(registries.eventTrigger('uo.a.one').kind, 'event')
  assert.equal(registries.eventTrigger('uo.a.two').kind, 'scheduled')
  assert.throws(
    () => register('uo', (api) => api.registerEventTriggers([decl({ id: 'uo.a.three', kind: 'cron' })])),
    /unknown kind "cron"/,
  )
})

test('a declaration keeps only what the contract names', () => {
  register('uo', (api) => api.registerEventTriggers([decl({ handler: () => 'nope', secret: 'x' })]))
  const t = registries.eventTrigger('uo.house.idoc_warning')
  assert.equal(t.handler, undefined)
  assert.equal(t.secret, undefined)
  assert.deepEqual(Object.keys(t).sort(), [
    'audience', 'ceiling', 'description', 'id', 'kind', 'label', 'owner', 'subjectKey',
    'variables', 'version',
  ])
})

// ── Audiences (§5.1a) ──────────────────────────────────────────────────────

const aud = (over = {}) => ({
  id: 'uo.team.members',
  label: 'Members of a team',
  ceiling: 'members',
  params: [{ id: 'teamId', type: 'int', required: true }],
  resolve: async () => [4, 9],
  ...over,
})

test('an audience registers, resolves to user ids, and never leaks its resolver', async () => {
  register('uo', (api) => api.registerAudiences([aud()]))
  const listed = registries.allAudiences()
  assert.equal(listed.length, 1)
  assert.equal(listed[0].resolve, undefined)
  assert.deepEqual((await registries.resolveAudience('uo.team.members', { teamId: 3 })).userIds, [4, 9])
})

test('an audience whose module is uninstalled is DORMANT and empty, never an error', async () => {
  const gone = await registries.resolveAudience('uo.team.members', { teamId: 3 })
  assert.deepEqual(gone, { dormant: true, userIds: [] })
})

test('a resolver that throws or answers rubbish costs an empty set, not a wrong one', async () => {
  register('uo', (api) => api.registerAudiences([
    aud({ id: 'uo.a.boom', resolve: async () => { throw new Error('db down') } }),
    aud({ id: 'uo.a.junk', resolve: async () => 'everyone' }),
    aud({ id: 'uo.a.dirty', resolve: async () => [4, '9', 0, -2, 4, null, 'x'] }),
  ]))
  assert.deepEqual((await registries.resolveAudience('uo.a.boom')).userIds, [])
  assert.deepEqual((await registries.resolveAudience('uo.a.junk')).userIds, [])
  // Filtered to positive integers and de-duplicated. This is the one value a
  // module hands core that decides who receives mail.
  assert.deepEqual((await registries.resolveAudience('uo.a.dirty')).userIds, [4, 9])
  // Not dormant: the module IS installed. Dormant is a different answer from
  // "resolved to nobody", and Phase 4's admin UI shows them differently.
  assert.equal((await registries.resolveAudience('uo.a.boom')).dormant, false)
})

test('an audience needs a ceiling, a resolve, and its owner\'s prefix', () => {
  assert.throws(() => register('uo', (api) => api.registerAudiences([aud({ ceiling: undefined })])), /needs a ceiling/)
  assert.throws(() => register('uo', (api) => api.registerAudiences([aud({ resolve: undefined })])), /has no resolve\(\)/)
  assert.throws(() => register('rust', (api) => api.registerAudiences([aud()])), /not namespaced "rust\."/)
})

test('audiences are their own id space — an audience may share a name with a trigger', () => {
  register('uo', (api) => {
    api.registerEventTriggers([decl({ id: 'uo.team.members' })])
    api.registerAudiences([aud({ id: 'uo.team.members' })])
  })
  assert.ok(registries.eventTrigger('uo.team.members'))
  assert.ok(registries.audience('uo.team.members'))
})

// ── The emit path (§4.3 property 1) ────────────────────────────────────────

const emitOk = () => {
  register('uo', (api) => api.registerEventTriggers([decl({ subjectKey: 'house' })]))
}

test('a valid emit validates, normalises and returns the event', () => {
  process.env.NODE_ENV = 'development'
  emitOk()
  const out = engagementEmit.emit('uo', 'uo.house.idoc_warning', {
    data: { house: 'The Silver Anvil', nextStage: '2026-08-30T04:00:00Z' },
    ownerUserId: 7,
  })
  assert.equal(out.ok, true)
  assert.equal(out.event.subject, 'The Silver Anvil') // derived from subjectKey
  assert.equal(out.event.ownerUserId, 7)
  assert.equal(out.event.data.nextStage, '2026-08-30T04:00:00.000Z') // normalised
  assert.ok(out.event.occurredAt)
})

test('a payload missing a required variable throws in dev and is dropped in prod', () => {
  emitOk()
  process.env.NODE_ENV = 'development'
  assert.throws(
    () => engagementEmit.emit('uo', 'uo.house.idoc_warning', { data: { nextStage: '2026-08-30T04:00:00Z' } }),
    /house: required/,
  )
  // Same call, production posture: no throw, and an unmistakable failure result.
  // This is called from inside a game-event handler; a contract problem of
  // core's must not become the module's control flow.
  process.env.NODE_ENV = 'production'
  const out = engagementEmit.emit('uo', 'uo.house.idoc_warning', { data: {} })
  assert.equal(out.ok, false)
  assert.match(out.reason, /payload for "uo\.house\.idoc_warning" is invalid/)
})

test('every payload problem is reported at once, not one per round trip', () => {
  process.env.NODE_ENV = 'development'
  register('uo', (api) => api.registerEventTriggers([decl({
    variables: [
      { name: 'house', type: 'string', required: true, example: 'x' },
      { name: 'count', type: 'int', required: true, example: 2 },
      { name: 'link', type: 'url', required: true, example: '/a' },
    ],
  })]))
  assert.throws(
    () => engagementEmit.emit('uo', 'uo.house.idoc_warning', { data: { house: 5, count: 1.5, link: 'x' } }),
    /house: expected a string; count: expected an integer; link: expected a site-relative path/,
  )
})

test('a url variable is relative-only — a protocol-relative path never reaches an href', () => {
  process.env.NODE_ENV = 'production'
  register('uo', (api) => api.registerEventTriggers([decl({
    variables: [{ name: 'link', type: 'url', required: true, example: '/houses/1' }],
  })]))
  const bad = (link) => engagementEmit.emit('uo', 'uo.house.idoc_warning', { data: { link } }).ok
  assert.equal(bad('//evil.test/x'), false)
  assert.equal(bad('https://evil.test/x'), false)
  assert.equal(bad('houses/1'), false)
  assert.equal(bad('/houses/1?stage=2'), true)
})

test('a module cannot emit another owner\'s trigger, nor an unknown one', () => {
  process.env.NODE_ENV = 'production'
  emitOk()
  const foreign = engagementEmit.emit('rust', 'uo.house.idoc_warning', { data: { house: 'x' } })
  assert.equal(foreign.ok, false)
  assert.match(foreign.reason, /belongs to "uo"/)

  const unknown = engagementEmit.emit('uo', 'uo.nope.gone', { data: {} })
  assert.equal(unknown.ok, false)
  assert.match(unknown.reason, /unknown event trigger/)
})

test('a scheduled trigger is not emitted directly — the evaluator fires it (Q6)', () => {
  process.env.NODE_ENV = 'production'
  register('uo', (api) => api.registerEventTriggers([decl({ kind: 'scheduled' })]))
  const out = engagementEmit.emit('uo', 'uo.house.idoc_warning', { data: { house: 'x' } })
  assert.equal(out.ok, false)
  assert.match(out.reason, /is kind "scheduled" and is not emitted directly/)
})

test('an explicit subject beats the declared subjectKey; envelope fields are bounded', () => {
  process.env.NODE_ENV = 'production'
  emitOk()
  const call = (envelope) => engagementEmit.emit('uo', 'uo.house.idoc_warning', {
    data: { house: 'The Silver Anvil' }, ...envelope,
  })
  assert.equal(call({ subject: 4141 }).event.subject, '4141')
  assert.equal(call({}).event.subject, 'The Silver Anvil')
  assert.equal(call({ subject: {} }).ok, false)
  assert.equal(call({ ownerUserId: 0 }).ok, false)
  assert.equal(call({ ownerUserId: '7' }).ok, false)
  assert.equal(call({ dedupeKey: 'x'.repeat(191) }).ok, false)
  assert.equal(call({ occurredAt: 'not a date' }).ok, false)
  assert.equal(call({ occurredAt: new Date('2026-01-02T03:04:05Z') }).event.occurredAt, '2026-01-02T03:04:05.000Z')
})

test('undeclared payload keys are dropped rather than rejected', () => {
  process.env.NODE_ENV = 'development'
  emitOk()
  const out = engagementEmit.emit('uo', 'uo.house.idoc_warning', {
    data: { house: 'The Silver Anvil', ownerIp: '10.0.0.4' },
  })
  assert.equal(out.ok, true)
  assert.equal(out.event.data.ownerIp, undefined)
})

// ── The admin catalog (G3) ─────────────────────────────────────────────────

test('GET /admin/engagement/triggers serves core\'s declarations and the ceiling vocabulary', () => {
  registries.registerCore()
  const res = mockRes()
  ctrl.listTriggers({}, res)
  // Five, plus Events Phase 10's seven.
  assert.equal(res.body.triggers.length, 12)
  const news = res.body.triggers.find((t) => t.id === 'news.post')
  assert.equal(news.owner, 'core')
  assert.ok(news.variables.some((v) => v.name === 'title' && v.example))
  // The lattice travels with the catalog so the rule editor never offers an
  // audience the server will refuse.
  // `staff` permits itself and `admin` beneath it — the one refinement in the
  // tree (Phase 11). Every other branch permits itself alone.
  const staff = res.body.ceilings.find((c) => c.id === 'staff')
  assert.deepEqual(staff.permits, ['staff', 'admin'])
  const admin = res.body.ceilings.find((c) => c.id === 'admin')
  assert.deepEqual(admin.permits, ['admin'])
  const everyone = res.body.ceilings.find((c) => c.id === 'everyone')
  assert.equal(everyone.permits.length, 7)
})

test('GET /admin/engagement/audiences never serves a resolver', () => {
  register('uo', (api) => api.registerAudiences([aud()]))
  const res = mockRes()
  ctrl.listAudiences({}, res)
  assert.equal(res.body.audiences.length, 1)
  assert.equal(res.body.audiences[0].resolve, undefined)
  assert.equal(res.body.audiences[0].ceiling, 'members')
})