// ── The dry run (EVENTS_PLAN.md Phase 6, EVENTS.md §I) ─────────────────────
//
// *"Materialise the steps, dispatch each with `verify: true`, report what would
// happen and what it would cost against the caps."*
//
// **The finding worth the most is the one no other path can make.** Every
// per-step check here is also made at save or at dispatch; the TOTAL is not.
// Three steps each spawning 15 under a cap of 30 pass every individual check and
// breach the cap on the third — at two in the morning, unattended, with the world
// half-changed. Adding the costs up across the whole version is the thing only a
// look at the plan as a whole can do, and it is why a dry run is worth more than
// the sum of its step checks.
//
// The second property this file holds is the one §I states outright: **`verify:
// true` must change nothing and must answer honestly.** So the actions here
// record what they were asked and assert that the flag arrived — a dry run that
// silently dispatched for real is the single worst bug this feature could ship,
// and it would look exactly like a passing test otherwise.

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 { verifySpec } = require('../src/events/verify')
const settingsDb = require('../src/model/events/eventActionSettings.db')
const db = require('../src/utils/db')

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

const originals = { ...settingsDb }
let store
let seen

beforeEach(() => {
  registries._reset()
  store = new Map()
  seen = []
  settingsDb.byIds = async (ids) =>
    new Map([...new Set(ids || [])].filter((i) => store.has(i)).map((i) => [i, store.get(i)]))
  settingsDb.get = async (id) => store.get(id) || null
})

afterEach(() => {
  Object.assign(settingsDb, originals)
  registries._reset()
})

const register = (entries, owner = 'test') => {
  const api = registries.stage(owner)
  api.registerEventActions(entries)
  registries.apply(api.staged)
}

const setSetting = (id, enabled, caps = {}) =>
  store.set(id, { action_id: id, enabled: enabled ? 1 : 0, caps })

/** An action that records every envelope it is handed and then answers `answer`. */
const recorder = (id, over = {}) => ({
  id,
  label: over.label || id,
  risk: over.risk || 'notify',
  reversible: 'none',
  version: over.version || 1,
  params: over.params || [],
  ...(over.cost ? { cost: over.cost } : {}),
  async perform(envelope) {
    seen.push({ id, ...envelope })
    if (over.throws) throw new Error(over.throws)
    return over.answer || { ok: true }
  },
})

const spec = (steps) => ({ phases: [{ key: 'one', steps }] })
const step = (actionId, params = {}, extra = {}) => ({ actionId, params, ...extra })

const ADMIN = { id: 1, role: 'admin' }
const EDITOR = { id: 2, role: 'editor' }

test('every step is dispatched with verify true, and nothing is asked to act', async () => {
  // §I's promise, held as an assertion about the envelope each action received.
  register([recorder('test.tell'), recorder('test.wait', { risk: 'inspect' })])
  const report = await verifySpec(spec([step('test.tell', { body: 'x' }), step('test.wait')]), { user: ADMIN })

  assert.equal(report.ok, true)
  assert.equal(report.steps, 2)
  assert.deepEqual(report.findings, [])
  assert.equal(seen.length, 2)
  for (const envelope of seen) assert.equal(envelope.verify, true)
})

test('the cost of the whole plan is added up across steps, and a total over the cap is a finding', async () => {
  // The one check that only exists here. Each of the three steps fits under 30 on
  // its own; together they do not.
  register([recorder('test.spawn', { risk: 'change', cost: (p) => ({ 'x.creatures': p.count }) })])
  setSetting('test.spawn', true, { 'x.creatures': 30 })

  const report = await verifySpec(
    spec([
      step('test.spawn', { count: 15 }),
      step('test.spawn', { count: 15 }),
      step('test.spawn', { count: 15 }),
    ]),
    { user: ADMIN },
  )

  assert.equal(report.ok, false)
  const total = report.findings.find((f) => f.code === 'cap-total')
  assert.ok(total, 'the whole-plan total must be its own finding')
  assert.match(total.message, /asks for 45 of "x.creatures" across all its steps, and this deployment allows 30/)
  assert.deepEqual(report.cost, [
    { dimension: 'x.creatures', total: 45, cap: 30, from: 'test.spawn', over: true },
  ])
})

test('a plan that fits reports its cost without a finding', async () => {
  register([recorder('test.spawn', { risk: 'change', cost: (p) => ({ 'x.creatures': p.count }) })])
  setSetting('test.spawn', true, { 'x.creatures': 30 })
  const report = await verifySpec(spec([step('test.spawn', { count: 12 }), step('test.spawn', { count: 8 })]), {
    user: ADMIN,
  })
  assert.equal(report.ok, true)
  assert.deepEqual(report.cost, [{ dimension: 'x.creatures', total: 20, cap: 30, from: 'test.spawn', over: false }])
})

test('an uncapped dimension is reported with its total and no cap', async () => {
  // Worth showing rather than hiding: "this event will spawn 40 creatures and
  // nothing bounds that" is exactly what an operator opening the switchboard
  // wants to have seen first.
  register([recorder('test.spawn', { risk: 'change', cost: () => ({ 'x.creatures': 40 }) })])
  setSetting('test.spawn', true, {})
  const report = await verifySpec(spec([step('test.spawn')]), { user: ADMIN })
  assert.equal(report.ok, true)
  assert.deepEqual(report.cost, [{ dimension: 'x.creatures', total: 40, cap: null, from: null, over: false }])
})

test('a step naming an action nobody registers is a dormant finding, and the rest are still checked', async () => {
  // Reported rather than thrown, so an author sees EVERY problem in one pass. A
  // verification that stopped at the first finding would make fixing a
  // twelve-step definition twelve round trips.
  register([recorder('test.tell')])
  const report = await verifySpec(spec([step('gone.away'), step('test.tell')]), { user: ADMIN })

  assert.equal(report.ok, false)
  assert.equal(report.findings.length, 1)
  assert.equal(report.findings[0].code, 'dormant')
  assert.equal(report.findings[0].actionId, 'gone.away')
  assert.equal(seen.length, 1, 'the registered step is still dispatched')
})

test('the caller’s own role is what the report answers against', async () => {
  // The value of doing it here: an editor is told a step needs an administrator
  // at the moment they can still do something about it, rather than at the moment
  // it does not run.
  register([recorder('test.change', { risk: 'change', label: 'Change things' })])
  setSetting('test.change', true)

  const asEditor = await verifySpec(spec([step('test.change')]), { user: EDITOR })
  assert.equal(asEditor.ok, false)
  assert.equal(asEditor.findings[0].code, 'role')

  const asAdmin = await verifySpec(spec([step('test.change')]), { user: ADMIN })
  assert.equal(asAdmin.ok, true)
})

test('a disabled action is a finding, and its step is never dispatched', async () => {
  // The order matters: dispatching a disabled action under `verify: true` would
  // change nothing, but it would call code the deployment has switched off, and
  // "we only ran it to ask whether we could run it" is not a defence anyone wants
  // to make.
  register([recorder('test.change', { risk: 'change' })])
  const report = await verifySpec(spec([step('test.change')]), { user: ADMIN })
  assert.equal(report.findings[0].code, 'disabled')
  assert.equal(seen.length, 0)
})

test('the module’s own refusal is a finding in the module’s words', async () => {
  // The half core cannot compute: whether the landmark exists, whether the
  // creature is on the allowlist, whether the shard is reachable at all.
  register([recorder('test.spawn', { answer: { ok: false, retry: false, error: 'no such landmark "Bratain"' } })])
  const report = await verifySpec(spec([step('test.spawn')]), { user: ADMIN })
  assert.equal(report.ok, false)
  assert.equal(report.findings[0].code, 'refused')
  assert.match(report.findings[0].message, /no such landmark/)
})

test('an action that throws under verify is a finding, not a 500 on the author’s screen', async () => {
  register([recorder('test.spawn', { throws: 'exploded' })])
  const report = await verifySpec(spec([step('test.spawn')]), { user: ADMIN })
  assert.equal(report.ok, false)
  assert.equal(report.findings[0].code, 'refused')
  assert.match(report.findings[0].message, /exploded/)
})

test('a step authored against an older action version is a WARNING, not an error', async () => {
  // §F: a bump makes the editor render a warning rather than refusing to run. The
  // level is the whole point — a warning does not hold a scheduled start, and an
  // error does.
  register([recorder('test.tell', { version: 3 })])
  const report = await verifySpec(spec([step('test.tell', {}, { actionVersion: 1 })]), { user: ADMIN })
  assert.equal(report.ok, true, 'a drift warning must not fail the dry run')
  assert.equal(report.findings[0].level, 'warning')
  assert.equal(report.findings[0].code, 'version-drift')
  assert.match(report.findings[0].message, /authored against version 1/)
})

test('a finding says which phase and which step it is about', async () => {
  // A twelve-step definition needs the finding anchored, or the author is left
  // reading the message and counting rows.
  register([recorder('test.tell')])
  const twoPhases = {
    phases: [
      { key: 'open', steps: [step('test.tell')] },
      { key: 'close', steps: [step('test.tell'), step('gone.away')] },
    ],
  }
  const report = await verifySpec(twoPhases, { user: ADMIN })
  assert.equal(report.steps, 3)
  assert.deepEqual(
    report.findings.map((f) => ({ phase: f.phase, seq: f.seq })),
    [{ phase: 'close', seq: 1 }],
  )
})

test('an empty spec verifies clean and costs nothing', async () => {
  const report = await verifySpec({ phases: [] }, { user: ADMIN })
  assert.deepEqual(report, { ok: true, steps: 0, findings: [], cost: [] })
})