// ── The event runner (EVENTS_PLAN.md Phase 2) ──────────────────────────────
//
// The phase's shipped claim, first: **a manually started event that broadcasts,
// waits, and completes.** Then the properties around it that are not behaviour
// so much as promises — the ones §E and §L make, and the two this codebase has
// already paid for once:
//
//   • a reclaim never resets `attempts` (Engagement Phase 14's defect)
//   • a parked GM cue is not stale, however long it waits
//   • no shape a failure can take reads as success (§F)
//   • a step naming an unregistered action fails terminal with the module named
//     and degrades the run — never a silent skip (§L)
//   • the three `on_failure` dispositions do three different things to the RUN
//   • the idempotency key does not vary by attempt (§E)
//
// **The three tables are stubbed at the `.db` layer** and the runner's own logic
// runs for real against them — the shape `engagementEngine.test.js` uses. What a
// stub cannot prove is the raw SQL whose correctness IS a server contract: the
// two CAS claims, the lease reclaim's two-statement order, and `holdNext`'s
// guard. Those run against a real MariaDB in `eventRunnerSql.test.js`, which
// skips when there is none. A stub reproduces the reading, not the server.
//
// Point the DB at a closed port before requiring anything: the registries reach
// utils/discordAnnounce, which builds 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 runner = require('../src/utils/eventRunner')
const { classify } = require('../src/events/dispatch')
const runsDb = require('../src/model/events/eventRuns.db')
const stepsDb = require('../src/model/events/eventRunSteps.db')
const logDb = require('../src/model/events/eventRunLog.db')
const versionsDb = require('../src/model/events/eventVersions.db')
const db = require('../src/utils/db')

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

const T0 = new Date('2026-09-02T12:00:00Z')
const later = (ms) => new Date(T0.getTime() + ms)

// ── In-memory stand-ins for the three tables ───────────────────────────────

let store
const originals = {}

for (const [name, mod] of [['runsDb', runsDb], ['stepsDb', stepsDb], ['logDb', logDb], ['versionsDb', versionsDb]]) {
  originals[name] = { mod, fns: { ...mod } }
}

const restoreOriginals = () => {
  for (const { mod, fns } of Object.values(originals)) Object.assign(mod, fns)
}

const TERMINAL_RUN = ['completed', 'cancelled', 'failed', 'missed']
const clone = (o) => JSON.parse(JSON.stringify(o, (k, v) => v))

function installStubs() {
  store = {
    runs: new Map(),
    steps: new Map(),
    log: [],
    versions: new Map(),
    definitions: new Map(),
    nextStepId: 1,
  }

  // Snapshots, not live references. A SQL SELECT hands back a copy, and the
  // runner reads `step.attempts` as the value BEFORE its own claim incremented
  // it — returning references here would make the retry budget off by one in the
  // stub only, which is exactly the class of thing a stub must not invent.
  const snapRun = (r) => ({ ...r })
  const snapStep = (s) => ({ ...s, params: { ...(s.params || {}) } })

  runsDb.findDue = async (now) =>
    [...store.runs.values()]
      .filter((r) => ['scheduled', 'starting', 'running', 'ending'].includes(r.status) && r.scheduled_for <= now)
      .sort((a, b) => a.scheduled_for - b.scheduled_for || a.id - b.id)
      .map(snapRun)

  runsDb.findMissed = async (now) =>
    [...store.runs.values()]
      .filter((r) => {
        const grace = store.definitions.get(r.definition_id)?.grace_seconds ?? 900
        return r.status === 'scheduled' && r.scheduled_for.getTime() + grace * 1000 < now.getTime()
      })
      .map(snapRun)

  runsDb.claimStart = async (id, owner, lease) => {
    const r = store.runs.get(id)
    if (!r || r.status !== 'scheduled') return false
    Object.assign(r, { status: 'starting', claimed_by: owner, claim_expires_at: lease, started_at: r.started_at || T0 })
    return true
  }

  runsDb.claimTick = async (id, owner, lease, now) => {
    const r = store.runs.get(id)
    if (!r || !['starting', 'running', 'ending'].includes(r.status)) return false
    // No owner-matches escape: a live lease is not re-enterable, not even by the
    // process that took it. The stub agrees with the statement on purpose.
    if (r.claim_expires_at && r.claim_expires_at >= now) return false
    Object.assign(r, { claimed_by: owner, claim_expires_at: lease })
    return true
  }

  runsDb.releaseClaim = async (id, owner) => {
    const r = store.runs.get(id)
    if (!r || r.claimed_by !== owner) return false
    Object.assign(r, { claimed_by: null, claim_expires_at: null })
    return true
  }

  runsDb.transition = async (id, from, to, opts = {}) => {
    const r = store.runs.get(id)
    const froms = Array.isArray(from) ? from : [from]
    if (!r || !froms.includes(r.status)) return false
    r.status = to
    if (opts.phase !== undefined) r.current_phase = opts.phase
    if (opts.error !== undefined) r.last_error = opts.error
    if (TERMINAL_RUN.includes(to)) {
      r.ended_at = r.ended_at || T0
      r.claimed_by = null
      r.claim_expires_at = null
    } else if (opts.clearClaim) {
      r.claimed_by = null
      r.claim_expires_at = null
    }
    return true
  }

  runsDb.setHealth = async (id, health) => {
    const r = store.runs.get(id)
    if (!r || r.health === health) return false
    r.health = health
    return true
  }

  runsDb.concurrencyHolder = async (key, exceptId) => {
    if (!key) return null
    const held = [...store.runs.values()].find(
      (r) => r.concurrency_key === key && r.id !== exceptId && ['starting', 'running', 'paused', 'ending'].includes(r.status),
    )
    return held ? { id: held.id, status: held.status, definition_id: held.definition_id } : null
  }

  runsDb.reclaimStale = async (now) => {
    let n = 0
    for (const r of store.runs.values()) {
      if (['starting', 'running', 'ending'].includes(r.status) && r.claim_expires_at && r.claim_expires_at < now) {
        r.claimed_by = null
        r.claim_expires_at = null
        n += 1
      }
    }
    return n
  }

  stepsDb.materialisePhase = async (runId, phase, steps) => {
    steps.forEach((s, i) => {
      // INSERT IGNORE against uq_evstep_slot (run_id, phase, seq).
      const exists = [...store.steps.values()].find((x) => x.run_id === runId && x.phase === phase && x.seq === i)
      if (exists) return
      const id = store.nextStepId++
      store.steps.set(id, {
        id,
        run_id: runId,
        phase,
        seq: i,
        action_id: s.actionId,
        params: s.params || {},
        action_version: s.actionVersion || 1,
        status: 'pending',
        due_at: null,
        attempts: 0,
        on_failure: s.onFailure || 'pause',
        idempotency_key: stepsDb.idempotencyKey(runId, id),
        claimed_by: null,
        claim_expires_at: null,
        last_error: null,
      })
    })
    return [...store.steps.values()].filter((s) => s.run_id === runId).map(snapStep)
  }

  stepsDb.nextOpenStep = async (runId, phase) => {
    const s = [...store.steps.values()]
      .filter((x) => x.run_id === runId && x.phase === phase && ['pending', 'running'].includes(x.status))
      .sort((a, b) => a.seq - b.seq || a.id - b.id)[0]
    return s ? snapStep(s) : null
  }

  stepsDb.claim = async (id, owner, lease, now) => {
    const s = store.steps.get(id)
    if (!s || s.status !== 'pending') return false
    if (s.due_at && s.due_at > now) return false
    Object.assign(s, { status: 'running', attempts: s.attempts + 1, claimed_by: owner, claim_expires_at: lease })
    return true
  }

  stepsDb.park = async (id) => {
    const s = store.steps.get(id)
    if (s && s.status === 'running') s.claim_expires_at = null
  }

  stepsDb.reschedule = async (id, dueAt, error) => {
    const s = store.steps.get(id)
    if (!s || s.status !== 'running') return
    // `attempts` is untouched: the claim already incremented it, and nothing else
    // may. This is the stub agreeing with the statement, not with the runner.
    Object.assign(s, { status: 'pending', due_at: dueAt, claimed_by: null, claim_expires_at: null, last_error: error })
  }

  stepsDb.finish = async (id, status, error) => {
    const s = store.steps.get(id)
    if (!s || s.status !== 'running') return
    Object.assign(s, { status, last_error: error, claimed_by: null, claim_expires_at: null, finished_at: T0 })
  }

  stepsDb.holdNext = async (runId, phase, afterSeq, dueAt) => {
    const s = [...store.steps.values()]
      .filter((x) => x.run_id === runId && x.phase === phase && x.seq > afterSeq && x.status === 'pending')
      .filter((x) => !x.due_at || x.due_at < dueAt)
      .sort((a, b) => a.seq - b.seq)[0]
    if (!s) return false
    s.due_at = dueAt
    return true
  }

  stepsDb.reclaimStale = async (now, maxAttempts = 0) => {
    let failed = 0
    let reclaimed = 0
    // Give up first, reclaim second — the order the statement uses, and the
    // reason `MAX_ATTEMPTS` is reachable at all.
    for (const s of store.steps.values()) {
      if (s.status === 'running' && s.claim_expires_at && s.claim_expires_at < now && maxAttempts > 0 && s.attempts >= maxAttempts) {
        Object.assign(s, { status: 'failed', last_error: 'gave up after repeated interruptions', claimed_by: null, claim_expires_at: null })
        failed += 1
      }
    }
    for (const s of store.steps.values()) {
      if (s.status === 'running' && s.claim_expires_at && s.claim_expires_at < now) {
        // NOT reset: attempts survives the reclaim.
        Object.assign(s, { status: 'pending', claimed_by: null, claim_expires_at: null })
        reclaimed += 1
      }
    }
    return { failed, reclaimed }
  }

  stepsDb.cancelPending = async (runId) => {
    let n = 0
    for (const s of store.steps.values()) {
      if (s.run_id === runId && s.status === 'pending') {
        s.status = 'cancelled'
        n += 1
      }
    }
    return n
  }

  stepsDb.listForRun = async (runId) =>
    [...store.steps.values()].filter((s) => s.run_id === runId).sort((a, b) => a.seq - b.seq).map(snapStep)

  logDb.write = async (line) => {
    store.log.push(line)
    return true
  }
  logDb.pruneTerminal = async () => 0

  versionsDb.getById = async (id) => store.versions.get(id) || null
}

// ── Fixtures ───────────────────────────────────────────────────────────────

let nextRunId = 1

function seedRun(phases, { scheduledFor = T0, graceSeconds = 900, concurrencyKey = null, status = 'scheduled' } = {}) {
  const id = nextRunId++
  store.definitions.set(id, { id, grace_seconds: graceSeconds })
  store.versions.set(id, { id, spec: { schedule: { kind: 'manual' }, phases } })
  store.runs.set(id, {
    id,
    definition_id: id,
    version_id: id,
    scope: '',
    status,
    health: 'ok',
    cleanup_status: 'not_required',
    current_phase: null,
    scheduled_for: scheduledFor,
    concurrency_key: concurrencyKey,
    params: null,
    rehearsal: 0,
    claimed_by: null,
    claim_expires_at: null,
    last_error: null,
    started_at: null,
    ended_at: null,
  })
  // Phase 1's `create()` materialises the FIRST phase at creation rather than at
  // start, so a seeded run has to as well — otherwise every test here would be
  // exercising a shape the admin route cannot produce.
  const first = phases[0]
  if (first) void stepsDb.materialisePhase(id, first.key, first.steps || [])
  return id
}

const step = (actionId, params = {}, onFailure = 'skip') => ({ actionId, params, onFailure, actionVersion: 1 })
const run = (id) => store.runs.get(id)
const stepsOf = (id) => [...store.steps.values()].filter((s) => s.run_id === id).sort((a, b) => a.seq - b.seq)
const kinds = (id) => store.log.filter((l) => l.runId === id).map((l) => l.kind)

// A registered test action whose behaviour the test dictates.
let scripted

beforeEach(() => {
  registries._reset()
  installStubs()
  nextRunId = 1
  scripted = {}
})

afterEach(() => {
  restoreOriginals()
  registries._reset()
})

/** Register actions the way a module does, through the real staging area. */
const register = (entries, owner = 'test') => {
  const api = registries.stage(owner)
  api.registerEventActions(entries)
  registries.apply(api.staged)
}

// ── Registering actions the tests drive ────────────────────────────────────
//
// Registered through the real registry rather than by stubbing `eventAction`,
// because the shape check at registration is part of what the runner relies on:
// an action that would not register is not one the runner has to survive.

const scriptedAction = (id, extra = {}) => ({
  id,
  label: id,
  risk: 'notify',
  reversible: 'none',
  version: 1,
  budgetMs: 1000,
  params: [],
  perform: async (envelope) => {
    ;(scripted[id] ||= { calls: [] }).calls.push(envelope)
    const answer = scripted[id].answers?.shift() ?? scripted[id].answer
    if (typeof answer === 'function') return answer(envelope)
    return answer ?? { ok: true }
  },
  ...extra,
})

test('a manually started event announces, waits and completes', async () => {
  register([scriptedAction('test.announce'), scriptedAction('test.wait')])
  scripted['test.wait'] = { calls: [], answer: { ok: true, holdFor: 300 } }

  const id = seedRun([
    { key: 'main', label: 'Main', steps: [step('test.announce'), step('test.wait'), step('test.announce')] },
  ])

  // Tick one: announce, then wait, then stop against the held third step.
  await runner.tick(T0)
  let s = stepsOf(id)
  assert.equal(s[0].status, 'done')
  assert.equal(s[1].status, 'done')
  assert.equal(s[2].status, 'pending', 'the step after a wait must not run in the same tick')
  assert.equal(s[2].due_at.getTime(), later(300_000).getTime(), 'the wait is the NEXT step due_at')
  assert.equal(run(id).status, 'running')
  assert.equal(run(id).claimed_by, null, 'a run left in flight gives its lease back')

  // Tick two, still inside the wait: nothing moves.
  await runner.tick(later(120_000))
  assert.equal(stepsOf(id)[2].status, 'pending')
  assert.equal(run(id).status, 'running')

  // Tick three, past it: the last step runs and the run completes.
  await runner.tick(later(301_000))
  assert.equal(stepsOf(id)[2].status, 'done')
  assert.equal(run(id).status, 'completed')
  assert.equal(run(id).health, 'ok')
  assert.ok(kinds(id).includes('phase.completed'))
  assert.ok(kinds(id).includes('run.status'))
})

test('a run passes through `ending` on its way to completed', async () => {
  register([scriptedAction('test.noop')])

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.noop')] }])
  await runner.tick(T0)

  const transitions = store.log.filter((l) => l.runId === id && l.kind === 'run.status').map((l) => l.detail.to)
  assert.deepEqual(transitions, ['starting', 'running', 'ending', 'completed'])
})

test('phases run in order and the next one is materialised on entry', async () => {
  register([scriptedAction('test.noop')])

  const id = seedRun([
    { key: 'opening', label: 'Opening', steps: [step('test.noop')] },
    { key: 'closing', label: 'Closing', steps: [step('test.noop'), step('test.noop')] },
  ])

  await runner.tick(T0)
  assert.equal(run(id).status, 'completed')
  assert.deepEqual(stepsOf(id).map((s) => s.phase), ['opening', 'closing', 'closing'])
  assert.ok(stepsOf(id).every((s) => s.status === 'done'))
})

test('a wait as the last step of a phase holds the NEXT phase, rather than meaning nothing', async () => {
  register([scriptedAction('test.noop'), scriptedAction('test.wait')])
  scripted['test.wait'] = { calls: [], answer: { ok: true, holdFor: 300 } }

  const id = seedRun([
    { key: 'opening', label: 'Opening', steps: [step('test.noop'), step('test.wait')] },
    { key: 'closing', label: 'Closing', steps: [step('test.noop')] },
  ])

  await runner.tick(T0)
  const closing = stepsOf(id).filter((x) => x.phase === 'closing')
  assert.equal(closing.length, 1, 'the next phase is materialised')
  assert.equal(closing[0].status, 'pending')
  assert.equal(
    closing[0].due_at.getTime(),
    later(300_000).getTime(),
    'the hold crosses the phase boundary; dropping it would start the next phase at once',
  )
  assert.equal(run(id).status, 'running')

  await runner.tick(later(301_000))
  assert.equal(run(id).status, 'completed')
})

test('a GM cue parks: the step stays running with no lease, and the reclaim leaves it alone', async () => {
  register([scriptedAction('test.cue'), scriptedAction('test.after')])
  scripted['test.cue'] = { calls: [], answer: { ok: true, await: 'human' } }

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.cue'), step('test.after')] }])

  await runner.tick(T0)
  const cue = stepsOf(id)[0]
  assert.equal(cue.status, 'running')
  assert.equal(cue.claim_expires_at, null, 'a parked step carries no lease')
  assert.equal(stepsOf(id)[1].status, 'pending', 'nothing after a cue proceeds')
  assert.ok(kinds(id).includes('step.parked'))

  // A week later the reclaim has still not touched it, and the cue has been
  // dispatched exactly once. This is the whole point of a NULL lease.
  await runner.tick(later(7 * 24 * 60 * 60 * 1000))
  assert.equal(stepsOf(id)[0].status, 'running')
  assert.equal(stepsOf(id)[0].attempts, 1)
  assert.equal(scripted['test.cue'].calls.length, 1)
  assert.equal(run(id).status, 'running')
})

test('a reclaim returns a stale step without resetting attempts', async () => {
  register([scriptedAction('test.slow')])

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.slow')] }])

  // Simulate a process that claimed the step and died: running, lease in the past.
  await runner.tick(T0)
  const s = stepsOf(id)[0]
  Object.assign(store.steps.get(s.id), { status: 'running', attempts: 2, claim_expires_at: later(-1000) })

  await stepsDb.reclaimStale(T0, runner.MAX_ATTEMPTS)
  assert.equal(store.steps.get(s.id).status, 'pending')
  assert.equal(store.steps.get(s.id).attempts, 2, 'Engagement Phase 14: a reclaim must never reset attempts')
})

test('a step whose attempts are spent leaves `running` as failed rather than being handed back', async () => {
  register([scriptedAction('test.slow')])

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.slow')] }])
  await runner.tick(T0)
  const s = stepsOf(id)[0]
  Object.assign(store.steps.get(s.id), { status: 'running', attempts: runner.MAX_ATTEMPTS, claim_expires_at: later(-1000) })

  const { failed, reclaimed } = await stepsDb.reclaimStale(T0, runner.MAX_ATTEMPTS)
  assert.equal(failed, 1)
  assert.equal(reclaimed, 0, 'a row that gave up must not also be reclaimed, or it retries forever')
  assert.equal(store.steps.get(s.id).status, 'failed')
})

test('a transient failure retries on a flat backoff with the same idempotency key, then applies on_failure', async () => {
  register([scriptedAction('test.flaky')])
  scripted['test.flaky'] = { calls: [], answer: { ok: false, retry: true, error: 'relay is down' } }

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.flaky', {}, 'skip')] }])
  const key = () => stepsOf(id)[0].idempotency_key

  await runner.tick(T0)
  const firstKey = key()
  assert.equal(stepsOf(id)[0].status, 'pending')
  assert.equal(stepsOf(id)[0].attempts, 1)
  assert.equal(stepsOf(id)[0].due_at.getTime(), later(runner.RETRY_MS).getTime())
  assert.equal(run(id).health, 'degraded', 'degraded from the first retry, not from the eventual failure')

  await runner.tick(later(runner.RETRY_MS))
  assert.equal(stepsOf(id)[0].attempts, 2)

  await runner.tick(later(2 * runner.RETRY_MS))
  assert.equal(stepsOf(id)[0].attempts, runner.MAX_ATTEMPTS)
  assert.equal(stepsOf(id)[0].status, 'failed', 'all three dispositions write the step failed')
  assert.equal(run(id).status, 'completed', 'on_failure: skip lets the run finish')
  assert.equal(run(id).health, 'degraded')

  assert.equal(key(), firstKey, 'the idempotency key does not vary by attempt')
  assert.equal(new Set(scripted['test.flaky'].calls.map((c) => c.idempotencyKey)).size, 1)
})

test('on_failure: pause stops the run and the tick never picks it up again', async () => {
  register([scriptedAction('test.bad'), scriptedAction('test.after')])
  scripted['test.bad'] = { calls: [], answer: { ok: false, retry: false, error: 'the world is half changed' } }

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.bad', {}, 'pause'), step('test.after')] }])

  await runner.tick(T0)
  assert.equal(run(id).status, 'paused')
  assert.equal(stepsOf(id)[0].status, 'failed')
  assert.equal(stepsOf(id)[1].status, 'pending', 'a paused run leaves its remaining steps alone')

  await runner.tick(later(60_000))
  assert.equal(run(id).status, 'paused', 'only Phase 3 resume moves a paused run')
  assert.equal(scripted['test.after']?.calls?.length ?? 0, 0)
})

test('on_failure: abort_run fails the run and cancels what has not started', async () => {
  register([scriptedAction('test.bad'), scriptedAction('test.after')])
  scripted['test.bad'] = { calls: [], answer: { ok: false, retry: false, error: 'no' } }

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.bad', {}, 'abort_run'), step('test.after')] }])

  await runner.tick(T0)
  assert.equal(run(id).status, 'failed')
  assert.equal(stepsOf(id)[0].status, 'failed')
  assert.equal(stepsOf(id)[1].status, 'cancelled')
})

test('a step naming an unregistered action fails terminal with the module named, and degrades the run', async () => {
  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('gone.verb', {}, 'skip')] }])

  await runner.tick(T0)
  const s = stepsOf(id)[0]
  assert.equal(s.status, 'failed', 'never a silent skip (§L)')
  assert.equal(s.attempts, 1, 'a dormant action is terminal, so it is not retried')
  assert.match(s.last_error, /gone\.verb/)
  assert.equal(run(id).health, 'degraded')
})

test('a held concurrency key holds the run at scheduled, and logs the reason once', async () => {
  register([scriptedAction('test.noop'), scriptedAction('test.cue')])
  scripted['test.cue'] = { calls: [], answer: { ok: true, await: 'human' } }

  // The holder is parked on a cue, which is what keeps it genuinely in flight. A
  // holder with no steps would complete itself on this same tick — correct
  // behaviour, and a fixture that proved nothing.
  const holder = seedRun([{ key: 'main', label: 'Main', steps: [step('test.cue')] }], {
    concurrencyKey: 'invasion:Yew',
  })
  const waiting = seedRun([{ key: 'main', label: 'Main', steps: [step('test.noop')] }], { concurrencyKey: 'invasion:Yew' })

  await runner.tick(T0)
  assert.equal(run(waiting).status, 'scheduled')
  assert.match(run(waiting).last_error, new RegExp(`run ${holder}`))
  assert.equal(kinds(waiting).filter((k) => k === 'run.blocked').length, 1)

  // Still held, and still one line: a line per tick would bury the one that matters.
  await runner.tick(later(15_000))
  assert.equal(kinds(waiting).filter((k) => k === 'run.blocked').length, 1)

  // The holder finishes, and the next tick starts the run that was waiting.
  store.runs.get(holder).status = 'completed'
  store.runs.get(holder).claim_expires_at = null
  await runner.tick(later(30_000))
  assert.equal(run(waiting).status, 'completed')
})

test('an occurrence past its own grace window is missed, never a late silent start', async () => {
  register([scriptedAction('test.noop')])

  const late = seedRun([{ key: 'main', label: 'Main', steps: [step('test.noop')] }], { graceSeconds: 600 })
  const inside = seedRun([{ key: 'main', label: 'Main', steps: [step('test.noop')] }], { graceSeconds: 3600 })

  // Both are due; the process has been down for half an hour.
  await runner.tick(later(30 * 60 * 1000))

  assert.equal(run(late).status, 'missed')
  assert.equal(stepsOf(late)[0].status, 'cancelled')
  assert.equal(run(inside).status, 'completed', 'inside its window it starts late and says so')
})

test('a run in `ending` when the process died is completed by the next tick', async () => {
  const id = seedRun([{ key: 'main', label: 'Main', steps: [] }], { status: 'ending' })
  store.runs.get(id).current_phase = 'main'

  await runner.tick(T0)
  assert.equal(run(id).status, 'completed')
})

test('a live lease is not re-enterable, not even by the process that took it', async () => {
  register([scriptedAction('test.cue')])
  scripted['test.cue'] = { calls: [], answer: { ok: true, await: 'human' } }

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.cue')] }])
  await runner.tick(T0)

  // Put a live lease back on the run, as an overrunning tick would have.
  Object.assign(store.runs.get(id), { claimed_by: runner.OWNER, claim_expires_at: later(60_000) })
  const taken = await runsDb.claimTick(id, runner.OWNER, later(120_000), T0)
  assert.equal(taken, false, 'the CAS is what protects a tick that overran into the next one')
})

// ── §F: no shape a failure can take reads as success ───────────────────────

test('classify: every failure shape is a failure', () => {
  assert.equal(classify(undefined, 'a').outcome, 'retry')
  assert.equal(classify(null, 'a').outcome, 'retry')
  assert.equal(classify('ok', 'a').outcome, 'retry')
  assert.equal(classify(['ok'], 'a').outcome, 'retry')
  assert.equal(classify({}, 'a').outcome, 'retry', 'a missing ok is not a success')
  assert.equal(classify({ ok: 'yes' }, 'a').outcome, 'retry', 'ok must be true, not truthy')
  assert.equal(classify({ ok: false }, 'a').outcome, 'retry')
  assert.equal(classify({ ok: false, retry: false }, 'a').outcome, 'terminal')
  assert.equal(classify({ __timedOut: true, error: 'slow' }, 'a').outcome, 'retry')
})

test('classify: the two success shapes that are not "finished"', () => {
  assert.equal(classify({ ok: true }, 'a').outcome, 'done')
  assert.equal(classify({ ok: true }, 'a').holdSeconds, 0)
  assert.equal(classify({ ok: true, await: 'human' }, 'a').outcome, 'parked')
  assert.equal(classify({ ok: true, holdFor: 90 }, 'a').holdSeconds, 90)
  assert.equal(classify({ ok: true, holdFor: '90' }, 'a').holdSeconds, 90)
  assert.equal(classify({ ok: true, holdFor: -1 }, 'a').outcome, 'terminal', 'a bad holdFor is not a silent zero')
  assert.equal(classify({ ok: true, holdFor: 'soon' }, 'a').outcome, 'terminal')
  assert.ok(classify({ ok: true, holdFor: 1e12 }, 'a').holdSeconds <= 7 * 24 * 60 * 60, 'holdFor is bounded')
})

test('an action that throws is a transient failure, not a crashed tick', async () => {
  register([
    scriptedAction('test.thrower', {
      perform: async () => {
        throw new Error('boom')
      },
    }),
  ])

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.thrower', {}, 'skip')] }])
  await runner.tick(T0)

  assert.equal(stepsOf(id)[0].status, 'pending')
  assert.match(stepsOf(id)[0].last_error, /boom/)
  assert.equal(run(id).status, 'running', 'one bad action does not stop the deployment')
})

test('an action that never answers is cut off at its declared budget', async () => {
  register([
    scriptedAction('test.hang', { budgetMs: 30, perform: () => new Promise(() => {}) }),
  ])

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.hang', {}, 'skip')] }])
  await runner.tick(T0)

  assert.equal(stepsOf(id)[0].status, 'pending', 'a timeout is transient')
  assert.match(stepsOf(id)[0].last_error, /budget/)
})

test('the dispatch envelope carries what §F says it carries', async () => {
  register([scriptedAction('test.echo')])

  const id = seedRun([{ key: 'main', label: 'Main', steps: [step('test.echo', {})] }])
  store.runs.get(id).scope = 'atlantic'
  await runner.tick(T0)

  const [envelope] = scripted['test.echo'].calls
  assert.equal(envelope.runId, id)
  assert.equal(envelope.scope, 'atlantic')
  assert.equal(envelope.verify, false)
  assert.equal(typeof envelope.idempotencyKey, 'string')
  assert.equal(envelope.idempotencyKey.length, 40)
  assert.deepEqual(Object.keys(envelope).sort(), ['actor', 'idempotencyKey', 'params', 'runId', 'scope', 'stepId', 'verify'])
})