import { test } from 'node:test'
import assert from 'node:assert/strict'
import {
  runControlsFor,
  stepControlsFor,
  isParked,
  lastStartedSeqOf,
  formFromDefinition,
  payloadFromForm,
  parseParams,
  blankStep,
  blankPhase,
  describeLogLine,
  runStatusWord,
} from '../src/lib/eventAuthoring.js'

// lib/eventAuthoring.js — what the three Events screens say and what they let
// staff press (EVENTS.md §I, Phase 3).
//
// None of this is a boundary: `events/spec.js` decides what may be saved and the
// six control statements decide what may happen to a run, each of them a
// compare-and-set that re-checks the status this file only predicted.
//
// **The controls get most of the tests, and the reason is worth stating.** A
// button offered that the server refuses is not a wrong write — but it is the
// failure an operator meets at 2am, on the screen they opened because something
// is already going wrong, about the run they are trying to stop. So the guards
// are deliberately written twice and this is where the copy is checked against
// the original.

const run = (over = {}) => ({ id: 1, status: 'running', currentPhase: 'main', ...over })
const step = (over = {}) => ({
  id: 10,
  phase: 'main',
  seq: 0,
  status: 'pending',
  parked: false,
  ...over,
})

// ── The run controls ───────────────────────────────────────────────────────

test('pause is offered only for a run in flight', () => {
  assert.equal(runControlsFor(run({ status: 'running' })).pause, true)
  assert.equal(runControlsFor(run({ status: 'starting' })).pause, true)
  // A scheduled occurrence that should not happen is cancelled, not paused:
  // resuming one after its grace window would produce a `missed` from a button
  // labelled resume.
  assert.equal(runControlsFor(run({ status: 'scheduled' })).pause, false)
  assert.equal(runControlsFor(run({ status: 'paused' })).pause, false)
})

test('cancel is offered right up to the moment a run goes terminal, and never after', () => {
  for (const status of ['scheduled', 'starting', 'running', 'paused', 'ending']) {
    assert.equal(runControlsFor(run({ status })).cancel, true, `${status} should be cancellable`)
  }
  for (const status of ['completed', 'cancelled', 'failed', 'missed']) {
    assert.equal(runControlsFor(run({ status })).cancel, false, `${status} should not be`)
  }
})

test('resume is offered for exactly one status', () => {
  assert.equal(runControlsFor(run({ status: 'paused' })).resume, true)
  assert.equal(runControlsFor(run({ status: 'running' })).resume, false)
})

// ── The step controls ──────────────────────────────────────────────────────

test('a parked step is running with nothing holding it, and only that', () => {
  assert.equal(isParked(step({ status: 'running', parked: true })), true)
  assert.equal(isParked(step({ status: 'running', parked: false })), false, 'a live lease is a dispatch')
  assert.equal(isParked(step({ status: 'pending', parked: true })), false)
})

test('confirm is offered for a parked cue and for nothing else', () => {
  const r = run()
  const parked = step({ status: 'running', parked: true })
  assert.equal(stepControlsFor(r, parked, [parked]).confirm, true)

  const dispatching = step({ status: 'running', parked: false })
  assert.equal(stepControlsFor(r, dispatching, [dispatching]).confirm, false)

  const pending = step()
  assert.equal(stepControlsFor(r, pending, [pending]).confirm, false)
})

test('skip is offered for a pending step and a parked cue', () => {
  const r = run()
  const pending = step()
  const parked = step({ id: 11, seq: 1, status: 'running', parked: true })
  const dispatching = step({ id: 12, seq: 2, status: 'running', parked: false })
  const failed = step({ id: 13, seq: 3, status: 'failed' })
  const steps = [pending, parked, dispatching, failed]

  assert.equal(stepControlsFor(r, pending, steps).skip, true)
  assert.equal(stepControlsFor(r, parked, steps).skip, true)
  assert.equal(stepControlsFor(r, dispatching, steps).skip, false)
  // A failed step does not need skipping: the runner already steps over it, so
  // resuming the run carries the phase past it.
  assert.equal(stepControlsFor(r, failed, steps).skip, false)
})

test('retry is offered for the failed step a paused run is stopped at', () => {
  const r = run({ status: 'paused' })
  const done = step({ id: 1, seq: 0, status: 'done' })
  const failed = step({ id: 2, seq: 1, status: 'failed' })
  const pending = step({ id: 3, seq: 2, status: 'pending' })
  const steps = [done, failed, pending]

  assert.equal(stepControlsFor(r, failed, steps).retry, true)
  assert.equal(stepControlsFor(r, done, steps).retry, false)
  assert.equal(stepControlsFor(r, pending, steps).retry, false)
})

test('retry is NOT offered for a failed step the run has moved past', () => {
  // The case the server guard exists for, and the one this copy of it has to
  // agree about: a phase that carried on past an `on_failure: skip` failure and
  // then paused at a later step. Offering retry on the first would re-queue a row
  // behind the runner's own cursor, where it sits pending for ever.
  const r = run({ status: 'paused' })
  const skippedOver = step({ id: 1, seq: 0, status: 'failed' })
  const carriedOn = step({ id: 2, seq: 1, status: 'done' })
  const stoppedAt = step({ id: 3, seq: 2, status: 'failed' })
  const notYet = step({ id: 4, seq: 3, status: 'pending' })
  const steps = [skippedOver, carriedOn, stoppedAt, notYet]

  assert.equal(stepControlsFor(r, skippedOver, steps).retry, false)
  assert.equal(stepControlsFor(r, stoppedAt, steps).retry, true)
})

test('retry is not offered while the run is still running, or in a phase it has left', () => {
  const failed = step({ status: 'failed' })
  assert.equal(stepControlsFor(run({ status: 'running' }), failed, [failed]).retry, false)

  const old = step({ phase: 'one', status: 'failed' })
  const r = run({ status: 'paused', currentPhase: 'two' })
  assert.equal(stepControlsFor(r, old, [old]).retry, false)
})

test('no control is offered on a run that is over', () => {
  for (const status of ['completed', 'cancelled', 'failed', 'missed']) {
    const parked = step({ status: 'running', parked: true })
    assert.deepEqual(stepControlsFor(run({ status }), parked, [parked]), {
      confirm: false,
      skip: false,
      retry: false,
    })
  }
})

test('lastStartedSeqOf is the furthest step of the phase, and null when none has run', () => {
  const steps = [
    step({ id: 1, seq: 0, status: 'failed' }),
    step({ id: 2, seq: 1, status: 'done' }),
    step({ id: 3, seq: 2, status: 'pending' }),
    step({ id: 4, seq: 0, phase: 'other', status: 'done' }),
  ]
  assert.equal(lastStartedSeqOf(steps, 'main'), 1)
  assert.equal(lastStartedSeqOf([step({ status: 'pending' })], 'main'), null)
  assert.equal(lastStartedSeqOf(steps, 'nothing-here'), null)
})

// ── The definition form ────────────────────────────────────────────────────

const ANNOUNCE = {
  id: 'core.announce',
  label: 'Announce',
  risk: 'notify',
  params: [
    { name: 'leg', type: 'string', required: true, example: 'discord' },
    { name: 'title', type: 'string', required: false, example: 'The gates open' },
    { name: 'body', type: 'string', required: true, example: 'A caravan was sighted.' },
  ],
}

test('a new step arrives prefilled from the action’s declared examples', () => {
  const fresh = blankStep(ANNOUNCE)
  assert.equal(fresh.actionId, 'core.announce')
  assert.deepEqual(JSON.parse(fresh.paramsText), {
    leg: 'discord',
    title: 'The gates open',
    body: 'A caravan was sighted.',
  })
})

test('a new phase never collides with an existing key', () => {
  // Two phases sharing a key would silently collapse at materialisation —
  // `event_run_steps` is UNIQUE on (run_id, phase, seq) — so half the authored
  // steps would never exist. The server refuses it; the form must not propose it.
  const first = blankPhase([])
  const second = blankPhase([first])
  const third = blankPhase([first, second])
  assert.equal(new Set([first.key, second.key, third.key]).size, 3)
})

test('the form round-trips a definition without losing a step', () => {
  const event = {
    title: 'Invasion',
    graceSeconds: 600,
    timezone: 'Europe/Berlin',
    concurrencyKey: 'invasion:{region}',
    spec: {
      schedule: { kind: 'manual' },
      phases: [
        {
          key: 'warn',
          label: 'Warning',
          steps: [
            { actionId: 'core.announce', label: 'Herald', onFailure: 'skip', params: { leg: 'discord', body: 'hi' } },
            { actionId: 'core.wait', params: { seconds: 300 } },
          ],
        },
      ],
    },
  }

  const built = payloadFromForm(formFromDefinition(event))
  assert.equal(built.ok, true)
  assert.deepEqual(built.payload.spec.phases, [
    {
      key: 'warn',
      label: 'Warning',
      steps: [
        { actionId: 'core.announce', label: 'Herald', onFailure: 'skip', params: { leg: 'discord', body: 'hi' } },
        { actionId: 'core.wait', params: { seconds: 300 } },
      ],
    },
  ])
  assert.equal(built.payload.graceSeconds, 600)
  assert.equal(built.payload.concurrencyKey, 'invasion:{region}')
})

test('an unchosen onFailure is omitted rather than invented', () => {
  // The server defaults it from the action's risk class, which is the whole
  // reason `risk` is required at registration. A form that posted a value would
  // silently override that — turning a `change` action's `pause` into a `skip`
  // and advancing a run over a half-changed world.
  const form = formFromDefinition({
    spec: { phases: [{ key: 'main', label: 'Main', steps: [{ actionId: 'core.announce', params: {} }] }] },
  })
  const built = payloadFromForm(form)
  assert.equal('onFailure' in built.payload.spec.phases[0].steps[0], false)
})

test('a params box that is not JSON is refused with the step named', () => {
  const form = formFromDefinition({
    spec: { phases: [{ key: 'main', label: 'Main', steps: [{ actionId: 'core.announce', params: {} }] }] },
  })
  form.phases[0].steps[0].paramsText = '{ leg: discord }'

  const built = payloadFromForm(form)
  assert.equal(built.ok, false)
  assert.match(built.errors[0], /Phase 1 "Main", step 1/)
})

test('an empty params box is an empty object, not an error', () => {
  assert.deepEqual(parseParams('').params, {})
  assert.deepEqual(parseParams('   ').params, {})
  assert.ok(parseParams('[1,2]').error, 'an array is not a params object')
  assert.ok(parseParams('"leg"').error)
})

// ── Rendering what happened ────────────────────────────────────────────────

test('a human transition reads differently from the runner’s own', () => {
  // Both are `run.status` rows. `detail.control` is the only thing that separates
  // "the runner paused this because a world write failed" from "somebody pressed
  // pause", and the console has to tell them apart at a glance.
  const byRunner = describeLogLine({
    kind: 'run.status',
    detail: { from: 'running', to: 'paused', because: 'core.spawn' },
  })
  const byPerson = describeLogLine({
    kind: 'run.status',
    detail: { from: 'running', to: 'paused', control: 'pause', by: 4, reason: 'shard is lagging' },
  })

  assert.match(byRunner, /Running → Paused/)
  assert.match(byRunner, /core\.spawn/)
  assert.match(byPerson, /pause/)
  assert.match(byPerson, /by staff/)
  assert.match(byPerson, /shard is lagging/)
})

test('the log lines a run produces all render as something', () => {
  const lines = [
    { kind: 'run.created', detail: { version: 3, rehearsal: true } },
    { kind: 'run.blocked', detail: { heldBy: 9, concurrencyKey: 'invasion:Yew' } },
    { kind: 'run.health', detail: { to: 'degraded', because: 'core.announce' } },
    { kind: 'phase.entered', phase: 'warn', detail: { steps: 2 } },
    { kind: 'phase.completed', phase: 'warn', detail: {} },
    { kind: 'step.parked', detail: { action: 'core.cue' } },
    { kind: 'step.retry', detail: { action: 'core.announce', attempt: 1, of: 3, error: 'timeout' } },
    { kind: 'step.status', detail: { action: 'core.wait', to: 'done' } },
    { kind: 'note', detail: {} },
  ]
  for (const line of lines) {
    const text = describeLogLine(line)
    assert.equal(typeof text, 'string')
    assert.ok(text.length > 0, `${line.kind} rendered as nothing`)
    assert.ok(!text.includes('undefined'), `${line.kind} rendered an undefined: ${text}`)
  }
})

test('every run status has a word, and an unknown one falls through rather than blanking', () => {
  for (const s of ['scheduled', 'starting', 'running', 'paused', 'ending', 'completed', 'cancelled', 'failed', 'missed']) {
    assert.ok(runStatusWord(s).length > 0)
  }
  assert.equal(runStatusWord('something-new'), 'something-new')
})