/**
 * @module tests/conformance/collider-fidelity
 * @description THE REOPEN-COLLIDER CONFORMANCE CASE (required cross-engine
 * before any RC counts as gates-green — ruled 2026-08-03). The
 * field-addressing law's fidelity half: user metadata may carry ANY name —
 * including every engine spelling (`confidence`, `type`, `id`, `createdAt`,
 * …) and every plumbing name (`level`, `data`, `vector`, `_rev`) — and the
 * value survives, verbatim and reachable, across the FULL lifecycle: live
 * reads, where/orderBy, flush, close+reopen, a forced epoch rebuild, and
 * time travel. The engine scalars stay separately reachable at `system.*`
 * the whole way. No halfway states.
 *
 * Self-arming like the namespace-law suite: skips loudly until the arming
 * exports are present, so the suite can sit on a branch ahead of the build.
 */
import { describe, it, expect, beforeAll, afterAll } from 'vitest'
import { mkdtempSync, rmSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import * as brainyExports from '../../src/index.js'
import { Brainy, NounType, VerbType } from '../../src/index.js'
import {
  BRAIN_FORMAT_PATH,
  EXPECTED_INDEX_EPOCH
} from '../../src/storage/brainFormat.js'

const ARMED = 'UnresolvableFieldError' in brainyExports
const suite = ARMED ? describe : describe.skip
if (!ARMED) {
  // eslint-disable-next-line no-console
  console.warn(
    '[collider-fidelity] SKIPPING: package root does not export the ' +
      'field-addressing law surface yet (UnresolvableFieldError absent).'
  )
}

/** Every entity system scalar name written as a USER metadata field, with
 * unmistakable user values, plus the plumbing names and naturals. */
const COLLIDER_BAG = {
  // the ten entity system scalars, as user fields
  id: 'user-id',
  type: 'user-type',
  subtype: 'user-subtype',
  createdAt: 'user-createdAt',
  updatedAt: 'user-updatedAt',
  confidence: 'user-confidence',
  weight: 'user-weight',
  visibility: 'user-visibility',
  service: 'user-service',
  createdBy: 'user-createdBy',
  // plumbing names, as user fields
  level: 7,
  data: 'user-data',
  vector: 'user-vector',
  _rev: 'user-rev',
  // naturals previously silently un-indexed by name
  content: 'user-content',
  // a plain control field
  plain: 'control'
} as const


suite('collider fidelity — the reopen-collider case (both suites, ruled)', () => {
  let dir: string
  let brain: Brainy
  let colliderId: string

  const open = async (): Promise<Brainy> => {
    const b = new Brainy({
      storage: { type: 'filesystem', path: dir },
      requireSubtype: false
    })
    await b.init()
    return b
  }

  /** The full read battery — run at every lifecycle boundary. */
  const verifyColliderTruth = async (label: string): Promise<void> => {
    // 1. get(): the bag comes back verbatim; engine scalars stay engine.
    const entity = await brain.get(colliderId)
    expect(entity, `${label}: entity readable`).toBeTruthy()
    for (const [k, v] of Object.entries(COLLIDER_BAG)) {
      expect(
        (entity!.metadata as Record<string, unknown>)[k],
        `${label}: bag.${k} verbatim`
      ).toEqual(v)
    }
    expect(entity!.type, `${label}: engine type intact`).toBe(NounType.Document)
    expect(entity!.confidence, `${label}: engine confidence intact`).toBe(0.25)

    // 2. where on collider names (bare = the user's field, always).
    for (const [k, v] of [
      ['confidence', 'user-confidence'],
      ['type', 'user-type'],
      ['id', 'user-id'],
      ['content', 'user-content'],
      ['data', 'user-data'],
      ['level', 7]
    ] as const) {
      const rows = await brain.find({ where: { [k]: v }, limit: 10 })
      expect(
        rows.map((r) => r.id),
        `${label}: where {${k}} finds the collider row`
      ).toContain(colliderId)
    }

    // 3. system.* keeps reading the ENGINE values.
    const byEngine = await brain.find({
      where: { 'system.confidence': 0.25 },
      limit: 10
    })
    expect(
      byEngine.map((r) => r.id),
      `${label}: system.confidence reads the engine scalar`
    ).toContain(colliderId)
    const byUserSpelledSystem = await brain.find({
      where: { 'system.confidence': 'user-confidence' },
      limit: 10
    })
    expect(
      byUserSpelledSystem.map((r) => r.id),
      `${label}: the user's value is NOT reachable via system.*`
    ).not.toContain(colliderId)

    // 4. orderBy a collider name orders by the USER values.
    const ordered = await brain.find({
      type: NounType.Document,
      orderBy: 'level',
      order: 'desc',
      limit: 10
    })
    expect(ordered.length, `${label}: ordered read complete`).toBe(3)
    expect(
      (ordered[0].metadata as Record<string, unknown>).plain,
      `${label}: user level orders desc (7 first)`
    ).toBe('control')
  }

  beforeAll(async () => {
    dir = mkdtempSync(join(tmpdir(), 'brainy-collider-'))
    brain = await open()

    colliderId = await brain.add({
      data: 'the collider probe document',
      type: NounType.Document,
      confidence: 0.25,
      metadata: { ...COLLIDER_BAG }
    })
    // two ordering companions with smaller user `level`s
    await brain.add({
      data: 'ordering companion low',
      type: NounType.Document,
      metadata: { level: 3, plain: 'low' }
    })
    await brain.add({
      data: 'ordering companion mid',
      type: NounType.Document,
      metadata: { level: 5, plain: 'mid' }
    })
  }, 120000)

  afterAll(async () => {
    await brain.close().catch(() => {})
    rmSync(dir, { recursive: true, force: true })
  })

  it('LIVE: colliders are the user’s, verbatim and fully queryable', async () => {
    await verifyColliderTruth('live')
  })

  it('REOPEN: the restart boundary loses nothing', async () => {
    await brain.flush()
    await brain.close()
    brain = await open()
    await verifyColliderTruth('reopen')
  })

  it('REBUILD: a forced epoch rebuild re-indexes the colliders from canonical', async () => {
    await brain.close()
    // Simulate epoch drift: a missing marker forces the full derived-index
    // rebuild at open — the exact path every pre-law brain takes once.
    rmSync(join(dir, BRAIN_FORMAT_PATH), { force: true })
    brain = await open()
    await verifyColliderTruth('rebuild')
    // And the rebuild re-stamps the current epoch.
    const marker = await (
      brain as unknown as {
        storage: { readRawObject(p: string): Promise<{ indexEpoch?: number } | null> }
      }
    ).storage.readRawObject(BRAIN_FORMAT_PATH)
    expect(marker?.indexEpoch).toBe(EXPECTED_INDEX_EPOCH)
  })

  it('TIME TRAVEL: asOf reads historical collider values faithfully', async () => {
    const gen = brain.generation()
    await brain.update({ id: colliderId, metadata: { confidence: 'user-confidence-v2' } })
    const now = await brain.get(colliderId)
    expect((now!.metadata as Record<string, unknown>).confidence).toBe('user-confidence-v2')

    const past = await brain.asOf(gen)
    try {
      const then = await past.get(colliderId)
      expect(
        (then!.metadata as Record<string, unknown>).confidence,
        'asOf reads the pre-update USER value'
      ).toBe('user-confidence')
    } finally {
      await past.release()
    }
    // engine scalar untouched throughout
    expect(now!.confidence).toBe(0.25)
  })

  it('RELATION MIRROR: edge collider bags survive write → read → reopen', async () => {
    const a = await brain.add({ data: 'edge endpoint a', type: NounType.Person, metadata: { plain: 'a' } })
    const b = await brain.add({ data: 'edge endpoint b', type: NounType.Person, metadata: { plain: 'b' } })
    const edgeBag = {
      verb: 'user-verb',
      confidence: 'user-edge-confidence',
      weight: 'user-edge-weight',
      subtype: 'user-edge-subtype',
      createdAt: 'user-edge-createdAt',
      service: 'user-edge-service'
    }
    const relId = await brain.relate({
      from: a,
      to: b,
      type: VerbType.RelatedTo,
      confidence: 0.5,
      metadata: { ...edgeBag }
    })

    const check = async (label: string): Promise<void> => {
      const rels = await brain.related({ from: a, type: VerbType.RelatedTo })
      const rel = rels.find((r) => r.id === relId)
      expect(rel, `${label}: relation readable`).toBeTruthy()
      for (const [k, v] of Object.entries(edgeBag)) {
        expect(
          (rel!.metadata as Record<string, unknown>)[k],
          `${label}: edge bag.${k} verbatim`
        ).toEqual(v)
      }
      expect(rel!.confidence, `${label}: engine edge confidence intact`).toBe(0.5)
      expect(rel!.type, `${label}: engine verb intact`).toBe(VerbType.RelatedTo)
    }

    await check('live')
    await brain.flush()
    await brain.close()
    brain = await open()
    await check('reopen')
  })

  it('FORGERY: user metadata keys spelled system.* refuse at every write door', async () => {
    await expect(
      brain.add({ data: 'forged', type: NounType.Document, metadata: { 'system.confidence': 1 } })
    ).rejects.toThrow(/system\./)
    await expect(
      brain.update({ id: colliderId, metadata: { 'system.type': 'x' } })
    ).rejects.toThrow(/system\./)
    const a = await brain.add({ data: 'forgery endpoint a', type: NounType.Person, metadata: {} })
    const b = await brain.add({ data: 'forgery endpoint b', type: NounType.Person, metadata: {} })
    await expect(
      brain.relate({ from: a, to: b, type: VerbType.RelatedTo, metadata: { 'system.verb': 'x' } })
    ).rejects.toThrow(/system\./)
  })

  it('CONFIG: the dead reservedFieldPolicy option refuses loudly, never ignored', () => {
    expect(
      () => new Brainy({ storage: { type: 'memory' }, reservedFieldPolicy: 'throw' } as never)
    ).toThrow(/field-addressing law/)
  })

  it('LEGACY: a pre-law flat record still reads with engine fields top-level', async () => {
    const storage = (
      brain as unknown as {
        storage: {
          saveNoun(n: unknown): Promise<void>
          saveNounMetadata(id: string, m: Record<string, unknown>): Promise<void>
        }
      }
    ).storage
    const legacyId = '00000000-0000-4000-8000-00000000f1a7'
    await storage.saveNoun({ id: legacyId, vector: new Array(384).fill(0.01), connections: new Map(), level: 0 })
    // Legacy FLAT shape: engine + user keys mixed at one level, NO _fmt stamp.
    // Sound to split by name — the pre-law door refused user colliders.
    await storage.saveNounMetadata(legacyId, {
      noun: NounType.Document,
      confidence: 0.75,
      createdAt: 1700000000000,
      updatedAt: 1700000000000,
      _rev: 1,
      legacyField: 'legacy-value'
    })
    const entity = await brain.get(legacyId)
    expect(entity).toBeTruthy()
    expect(entity!.confidence, 'legacy flat confidence = engine').toBe(0.75)
    expect(
      (entity!.metadata as Record<string, unknown>).legacyField,
      'legacy custom field = user bag'
    ).toBe('legacy-value')
    expect(
      (entity!.metadata as Record<string, unknown>).confidence,
      'legacy flat engine key never leaks into the bag'
    ).toBeUndefined()
  })
})