/**
 * @module tests/unit/get-index-status-readiness
 * @description Pattern-A / Finding 9: getIndexStatus reported `populated: size>0`
 * and only `migrating`, so a native index that loaded its count but not its
 * serving structure reported populated:true — a k8s readiness probe would 200 a
 * brain that serves []. It now folds in the honest isReady() signal + the
 * _indexRebuildFailed / _indexDegradedIds degraded states (mirroring
 * validateIndexConsistency / checkHealth).
 */
import { describe, it, expect, beforeEach } from 'vitest'
import { Brainy, NounType } from '../../src/index.js'

describe('getIndexStatus honest readiness (Finding 9)', () => {
  let brain: any
  beforeEach(async () => {
    process.env.BRAINY_DETERMINISTIC_EMBEDDINGS = 'true'
    brain = new Brainy({ requireSubtype: false, storage: { type: 'memory' }, dimensions: 384 })
    await brain.init()
    await brain.add({ data: 'x', type: NounType.Concept })
    await brain.flush()
  })

  it('a not-ready provider makes populated honest (false) and exposes ready:false', async () => {
    brain.index.isReady = () => false // count present, serving structure NOT loaded
    const status = await brain.getIndexStatus()
    expect(status.hnswIndex.populated).toBe(false)
    expect(status.hnswIndex.ready).toBe(false)
    delete brain.index.isReady
  })

  it('a ready provider reports populated:true + ready:true', async () => {
    brain.index.isReady = () => true
    const status = await brain.getIndexStatus()
    expect(status.hnswIndex.populated).toBe(true)
    expect(status.hnswIndex.ready).toBe(true)
    delete brain.index.isReady
  })

  it('rebuildFailed / rebuildError surface the init-degraded state', async () => {
    brain._indexRebuildFailed = new Error('boom')
    const status = await brain.getIndexStatus()
    expect(status.rebuildFailed).toBe(true)
    expect(status.rebuildError).toBe('boom')
    brain._indexRebuildFailed = null
  })

  it('degradedIds surfaces the adopt-forward degraded set', async () => {
    brain._indexDegradedIds.add('00000000-0000-4000-8000-0000000000de')
    const status = await brain.getIndexStatus()
    expect(status.degradedIds).toBe(1)
    brain._indexDegradedIds.clear()
  })

  it('a JS-baseline provider (no isReady) omits ready and falls back to size>0', async () => {
    const status = await brain.getIndexStatus()
    expect(status.hnswIndex.ready).toBeUndefined()
    expect(status.hnswIndex.populated).toBe(brain.index.size() > 0)
  })
})