/**
 * @module tests/unit/db/log-authority-oracle-verbs
 * @description The verification oracle's VERB legs — module-level pins with
 * doubles (the brain-level wiring rides the owner's call site):
 * 1. Wired verb legs diff verbs exactly like nouns (pre-log / state-differs /
 *    tombstone-vs-present / log-live-absent).
 * 2. UNWIRED verb legs = an HONEST PARTIAL verdict: verbsChecked stays 0 —
 *    the oracle never claims scope it did not scan.
 */
import { describe, it, expect } from 'vitest'
import { runLogCompletenessOracle, recordDigest } from '../../../src/db/logAuthority.js'
import type { FactScanHandle } from '../../../src/db/factLog.js'

type Op = { kind: 'noun' | 'verb'; id: string; record: { metadata: unknown; vector: unknown } | null }

function scanOf(facts: Array<{ generation: number; ops: Op[] }>): () => FactScanHandle | null {
  return () =>
    ({
      batches: async function* () {
        yield { facts: facts.map((f) => ({ ...f, timestamp: 0 })) }
      }
    }) as unknown as FactScanHandle
}

function pagedList(rows: string[]) {
  return async ({ pagination }: { pagination: { limit: number; offset?: number } }) => {
    const start = pagination.offset ?? 0
    const items = rows.slice(start, start + pagination.limit).map((id) => ({ id }))
    return { items, hasMore: start + pagination.limit < rows.length }
  }
}

const rec = (v: number) => ({ metadata: { v }, vector: null })

describe('oracle verb legs', () => {
  it('wired: verbs diff by digest — clean log goes green over nouns AND verbs', async () => {
    const report = await runLogCompletenessOracle({
      storage: { getNouns: pagedList(['n1']) } as never,
      scanFacts: scanOf([
        { generation: 1, ops: [{ kind: 'noun', id: 'n1', record: rec(1) }] },
        { generation: 2, ops: [{ kind: 'verb', id: 'v1', record: rec(7) }] }
      ]),
      canonicalNounDigest: async () => recordDigest(rec(1)),
      factRecordDigest: recordDigest,
      canonicalVerbDigest: async () => recordDigest(rec(7)),
      getVerbs: pagedList(['v1'])
    })
    expect(report.verdict).toBe('green')
    expect(report.nounsChecked).toBe(1)
    expect(report.verbsChecked).toBe(1)
    expect(report.matched).toBe(2)
  })

  it('wired: every verb divergence class is NAMED', async () => {
    const report = await runLogCompletenessOracle({
      storage: { getNouns: pagedList([]) } as never,
      scanFacts: scanOf([
        {
          generation: 1,
          ops: [
            { kind: 'verb', id: 'v-differs', record: rec(1) },
            { kind: 'verb', id: 'v-tomb', record: null },
            { kind: 'verb', id: 'v-orphan', record: rec(3) }
          ]
        }
      ]),
      canonicalNounDigest: async () => null,
      factRecordDigest: recordDigest,
      canonicalVerbDigest: async (id) =>
        id === 'v-differs' ? recordDigest(rec(999)) : id === 'v-tomb' ? recordDigest(rec(2)) : null,
      // canonical enumerates: v-differs (drifted), v-tomb (log says deleted),
      // v-prelog (never logged); v-orphan is log-live but canonical-absent.
      getVerbs: pagedList(['v-differs', 'v-tomb', 'v-prelog'])
    })
    expect(report.verdict).toBe('red')
    const by = (id: string) => report.mismatches.find((m) => m.id === id)
    expect(by('v-differs')).toMatchObject({ kind: 'verb', reason: 'state-differs' })
    expect(by('v-tomb')).toMatchObject({ kind: 'verb', reason: 'log-tombstone-canonical-present' })
    expect(by('v-prelog')).toMatchObject({ kind: 'verb', reason: 'pre-log-record' })
    expect(by('v-orphan')).toMatchObject({ kind: 'verb', reason: 'log-live-canonical-absent' })
  })

  it('unwired: verbsChecked stays 0 — honest partial scope, never a silent claim', async () => {
    const report = await runLogCompletenessOracle({
      storage: { getNouns: pagedList(['n1']) } as never,
      scanFacts: scanOf([
        { generation: 1, ops: [{ kind: 'noun', id: 'n1', record: rec(1) }] },
        { generation: 2, ops: [{ kind: 'verb', id: 'v1', record: rec(7) }] }
      ]),
      canonicalNounDigest: async () => recordDigest(rec(1)),
      factRecordDigest: recordDigest
    })
    expect(report.verbsChecked).toBe(0)
    expect(report.nounsChecked).toBe(1)
  })
})