// ── The event spec validator (EVENTS.md §C/§D, Phase 1) ────────────────────
//
// The boundary that decides whether a version may exist. Its interesting cases
// are all about time rather than shape:
//
//   • a step's params are checked against the action's DECLARED params, and the
//     action version it was authored against is captured at save
//   • `on_failure` is defaulted from the risk class, because a `change` action
//     that fell back to `skip` would advance a run over a half-changed world
//   • an unregistered action is refused on a NEW step and KEPT on an existing
//     one — the rule `engagementRules.model` established for a dormant trigger,
//     for the same reason: an uninstall must not be destructive after the fact
//   • a dormant step blocks a PUBLISH and never a SAVE
//   • two phases may not share a key, because `UNIQUE (run_id, phase, seq)`
//     would silently collapse them into one at materialisation
//   • a key a later phase owns (`advance`, `announcements`) is REFUSED rather
//     than preserved, so no corpus of unvalidated specs accumulates
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 spec = require('../src/events/spec')
const db = require('../src/utils/db')

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

beforeEach(() => {
  registries._reset()
  registries.registerCore()
  const api = registries.stage('demo')
  api.registerEventActions([
    {
      id: 'demo.world.change',
      label: 'Change the world',
      risk: 'change',
      reversible: 'none',
      version: 4,
      params: [
        { name: 'region', type: 'string', required: true, example: 'Yew' },
        { name: 'count', type: 'int', required: true, example: 12 },
        { name: 'hue', type: 'int', required: false, example: 1157 },
      ],
      perform: async () => ({ ok: true }),
    },
    {
      id: 'demo.world.wreck',
      label: 'Wreck the world',
      risk: 'irreversible',
      reversible: 'none',
      perform: async () => ({ ok: true }),
    },
  ])
  registries.apply(api.staged)
})
afterEach(() => registries._reset())

const oneStep = (step) => ({
  schedule: { kind: 'manual' },
  phases: [{ key: 'main', label: 'Main', steps: [step] }],
})

test('the empty spec is valid, and is what a new draft carries', () => {
  const result = spec.validate(spec.emptySpec())
  assert.equal(result.ok, true)
  assert.equal(result.spec.phases.length, 1)
  assert.deepEqual(result.spec.schedule, { kind: 'manual' })
})

test('params are checked against the declaration and coerced', () => {
  const result = spec.validate(
    oneStep({ actionId: 'demo.world.change', params: { region: 'Yew', count: 12 } }),
  )
  assert.equal(result.ok, true)
  const [step] = result.spec.phases[0].steps
  assert.deepEqual(step.params, { region: 'Yew', count: 12 })
  // Captured from the declaration, not from the request: it is what lets a later
  // bump warn in the editor instead of dispatching a mistyped parameter.
  assert.equal(step.actionVersion, 4)
  assert.equal(step.dormant, false)
})

test('a missing required param, a wrong type and an unknown param are all refused', () => {
  const missing = spec.validate(oneStep({ actionId: 'demo.world.change', params: { region: 'Yew' } }))
  assert.equal(missing.ok, false)
  assert.match(missing.errors.join('\n'), /"count" is required/)

  const wrong = spec.validate(
    oneStep({ actionId: 'demo.world.change', params: { region: 'Yew', count: 'twelve' } }),
  )
  assert.equal(wrong.ok, false)
  assert.match(wrong.errors.join('\n'), /"count" expected an integer/)

  // An unknown param is an ERROR, not a silent drop: an author who typed
  // `regions` has written a step that would dispatch with the region missing,
  // and dropping the key makes that look like it saved cleanly.
  const typo = spec.validate(
    oneStep({ actionId: 'demo.world.change', params: { regions: 'Yew', count: 1 } }),
  )
  assert.equal(typo.ok, false)
  assert.match(typo.errors.join('\n'), /"regions" is not a param of demo\.world\.change/)
})

test('on_failure is defaulted from the risk class', () => {
  const notify = spec.validate(
    oneStep({ actionId: 'core.announce', params: { leg: 'discord', body: 'hi' } }),
  )
  assert.equal(notify.spec.phases[0].steps[0].onFailure, 'skip')

  const change = spec.validate(
    oneStep({ actionId: 'demo.world.change', params: { region: 'Yew', count: 1 } }),
  )
  assert.equal(change.spec.phases[0].steps[0].onFailure, 'pause')

  const irreversible = spec.validate(oneStep({ actionId: 'demo.world.wreck' }))
  assert.equal(irreversible.spec.phases[0].steps[0].onFailure, 'abort_run')

  // An author may still choose, within the closed set.
  const chosen = spec.validate(oneStep({ actionId: 'demo.world.wreck', onFailure: 'skip' }))
  assert.equal(chosen.spec.phases[0].steps[0].onFailure, 'skip')
  const invented = spec.validate(oneStep({ actionId: 'demo.world.wreck', onFailure: 'shrug' }))
  assert.equal(invented.ok, false)
  assert.match(invented.errors.join('\n'), /onFailure: must be one of/)
})

test('a NEW step may not name an unregistered action', () => {
  const result = spec.validate(oneStep({ actionId: 'gone.module.verb' }))
  assert.equal(result.ok, false)
  assert.match(result.errors.join('\n'), /no module registers "gone\.module\.verb"/)
})

test('an EXISTING step keeps its action when the module goes away, and is marked dormant', () => {
  const saved = spec.validate(
    oneStep({ actionId: 'demo.world.change', params: { region: 'Yew', count: 3 } }),
  ).spec

  // The module is uninstalled between one save and the next.
  registries._reset()
  registries.registerCore()

  const again = spec.validate(saved, { knownActionIds: spec.actionIdsIn(saved) })
  assert.equal(again.ok, true, again.errors && again.errors.join('\n'))
  const [step] = again.spec.phases[0].steps
  assert.equal(step.dormant, true)
  // Params pass through untouched: the only thing that could validate them left
  // with the module.
  assert.deepEqual(step.params, { region: 'Yew', count: 3 })

  // …and that is exactly what publish refuses.
  const publishable = spec.publishable(again.spec)
  assert.equal(publishable.ok, false)
  assert.deepEqual(publishable.dormant, ['demo.world.change'])
})

test('validate accepts its own output — a saved spec is re-validated on every save', () => {
  // The property the dormancy test above found the hard way: `validate` adds
  // `actionVersion` and `dormant`, and a validator that then refused its own
  // fields would make the SECOND save of any definition impossible, and publish
  // — which re-validates before snapshotting — impossible full stop.
  const once = spec.validate(
    oneStep({ actionId: 'demo.world.change', params: { region: 'Yew', count: 3 } }),
  )
  const twice = spec.validate(once.spec)
  assert.equal(twice.ok, true, twice.errors && twice.errors.join('\n'))
  assert.deepEqual(twice.spec, once.spec)
})

test('two phases may not share a key', () => {
  const result = spec.validate({
    schedule: { kind: 'manual' },
    phases: [
      { key: 'main', label: 'One', steps: [] },
      { key: 'main', label: 'Two', steps: [] },
    ],
  })
  assert.equal(result.ok, false)
  assert.match(result.errors.join('\n'), /used by more than one phase/)
})

test('a key a later phase owns is refused, not silently preserved', () => {
  const top = spec.validate({ schedule: { kind: 'manual' }, phases: [], announcements: [] })
  assert.equal(top.ok, false)
  assert.match(top.errors.join('\n'), /unknown key "announcements"/)

  const phase = spec.validate({
    schedule: { kind: 'manual' },
    phases: [{ key: 'main', label: 'Main', steps: [], advance: { after: '30m' } }],
  })
  assert.equal(phase.ok, false)
  assert.match(phase.errors.join('\n'), /unknown key\(s\) advance .*Phase 5/)
})

test('only the manual schedule exists in this phase', () => {
  const weekly = spec.validate({
    schedule: { kind: 'weekly', days: ['fri'], time: '20:00' },
    phases: [{ key: 'main', label: 'Main', steps: [] }],
  })
  assert.equal(weekly.ok, false)
  assert.match(weekly.errors.join('\n'), /recurrence arrives in Phase 4/)
})

test('every problem is reported, not just the first', () => {
  const result = spec.validate({
    schedule: { kind: 'manual' },
    phases: [
      { key: 'BAD KEY', label: '', steps: [{ actionId: 'demo.world.change', params: {} }] },
    ],
  })
  assert.equal(result.ok, false)
  const joined = result.errors.join('\n')
  assert.match(joined, /bad phase key/)
  assert.match(joined, /a phase needs a label/)
  assert.match(joined, /"region" is required/)
  assert.match(joined, /"count" is required/)
})

test('the size bounds hold', () => {
  const many = {
    schedule: { kind: 'manual' },
    phases: Array.from({ length: spec.MAX_PHASES + 1 }, (_, i) => ({
      key: `p${i}`,
      label: `P${i}`,
      steps: [],
    })),
  }
  const result = spec.validate(many)
  assert.equal(result.ok, false)
  assert.match(result.errors.join('\n'), new RegExp(`at most ${spec.MAX_PHASES} phases`))
})