/**
 * @module tests/unit/validate-invariants-delegation
 * @description validateIndexConsistency() was blind to native
 * providers — it only saw the JS metadata index, so a native manifest↔segments↔count
 * divergence read as "healthy". It now feature-detects + aggregates each provider's
 * validateInvariants(), and repairIndex() maps a failing invariant with heal:'rebuild'
 * to that provider's rebuild(). "healthy-while-broken must be impossible."
 */
import { describe, it, expect, beforeEach } from 'vitest'
import { Brainy, NounType } from '../../src/index.js'
import type { ProviderInvariantReport } from '../../src/index.js'

const healthyReport = (provider: string): ProviderInvariantReport => ({
  provider,
  healthy: true,
  serving: true,
  invariants: [{ name: 'manifest-residency', holds: true, detail: 'ok', heal: 'none' }],
  checkedAt: 1,
  durationMs: 1
})

const brokenReport = (provider: string): ProviderInvariantReport => ({
  provider,
  healthy: false,
  serving: true,
  invariants: [
    { name: 'manifest-residency', holds: true, detail: 'ok', heal: 'none' },
    {
      name: 'posted-count-floor',
      holds: false,
      detail: 'posted 2304 < canonical 2354',
      expected: 2354,
      actual: 2304,
      heal: 'rebuild'
    }
  ],
  checkedAt: 1,
  durationMs: 2
})

describe('validateIndexConsistency delegates to provider validateInvariants() (Pass 3)', () => {
  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 broken provider report makes the store unhealthy and names the failing invariant', async () => {
    brain.index.validateInvariants = async () => brokenReport('vector')
    const v = await brain.validateIndexConsistency()
    expect(v.healthy).toBe(false)
    expect(v.recommendation).toMatch(/posted-count-floor/)
    expect(v.recommendation).toMatch(/posted 2304 < canonical 2354/)
    expect(v.recommendation).toMatch(/repairIndex\(\)/)
    expect(v.providers?.some((p: ProviderInvariantReport) => p.provider === 'vector' && !p.healthy)).toBe(true)
    delete brain.index.validateInvariants
  })

  it('all-healthy provider reports do not flip the store unhealthy', async () => {
    brain.index.validateInvariants = async () => healthyReport('vector')
    brain.graphIndex.validateInvariants = async () => healthyReport('graph')
    const v = await brain.validateIndexConsistency()
    expect(v.healthy).toBe(true)
    expect(v.providers?.length).toBe(2)
    delete brain.index.validateInvariants
    delete brain.graphIndex.validateInvariants
  })

  it('a validateInvariants() that THROWS is surfaced as unhealthy, never swallowed', async () => {
    brain.index.validateInvariants = async () => { throw new Error('provider blew up') }
    const v = await brain.validateIndexConsistency()
    expect(v.healthy).toBe(false)
    expect(v.recommendation).toMatch(/validate-invariants-threw/)
    delete brain.index.validateInvariants
  })

  it('providers without validateInvariants() are omitted (JS baseline unchanged)', async () => {
    const v = await brain.validateIndexConsistency()
    expect(v.providers).toBeUndefined()
    expect(typeof v.healthy).toBe('boolean')
  })

  it('repairIndex() rebuilds a provider whose failing invariant asks for it', async () => {
    let rebuilt = false
    brain.index.validateInvariants = async () => (rebuilt ? healthyReport('vector') : brokenReport('vector'))
    const origRebuild = brain.index.rebuild.bind(brain.index)
    brain.index.rebuild = async (...a: any[]) => { rebuilt = true; return origRebuild(...a) }
    await brain.repairIndex()
    expect(rebuilt).toBe(true)
    // After repair, the store validates healthy again.
    const v = await brain.validateIndexConsistency()
    expect(v.providers?.find((p: ProviderInvariantReport) => p.provider === 'vector')?.healthy).toBe(true)
    brain.index.rebuild = origRebuild
    delete brain.index.validateInvariants
  })
})