/**
 * Test du ChunkIndexingService — dedup, stale deletion, upsert.
 * Mocke l'embedding (pas d'appel API), utilise la vraie DB.
 */
import { prisma } from '../../lib/prisma'
import { ChunkIndexingService } from '../../lib/ai/services/chunk-indexing.service'

const testNoteId = 'test-chunk-000001'

function test(name: string, fn: () => Promise<void>) {
  return fn()
    .then(() => console.log(`  ✓ ${name}`))
    .catch((err: any) => {
      console.error(`  ✗ ${name}: ${err.message}`)
      process.exitCode = 1
    })
}

// Mock l'embedding service : vecteur déterministe basé sur le hash du contenu
const originalEmbedText =
  require('../../lib/ai/services/embedding.service').embeddingService.embedText

function mockEmbedding() {
  const svc = require('../../lib/ai/services/embedding.service').embeddingService
  svc.embedText = async (text: string) => {
    const crypto = require('crypto')
    const hash = crypto.createHash('md5').update(text).digest()
    return Array.from({ length: 1536 }, (_, i) => hash[i % 16] / 255)
  }
}

function restoreEmbedding() {
  const svc = require('../../lib/ai/services/embedding.service').embeddingService
  svc.embedText = originalEmbedText
}

async function ensureTestNote() {
  await prisma.note.upsert({
    where: { id: testNoteId },
    create: {
      id: testNoteId,
      title: 'Test Note for Chunk Indexing',
      content: '<p>Test</p>',
    },
    update: {},
  })
}

async function cleanup() {
  await prisma.noteEmbeddingChunk.deleteMany({ where: { noteId: testNoteId } })
}

async function removeTestNote() {
  await prisma.note.delete({ where: { id: testNoteId } }).catch(() => {})
}

async function main() {
  mockEmbedding()
  await ensureTestNote()
  await cleanup()

  console.log('\n=== US-CHUNK-2 : Indexation incrémentale avec dedup ===\n')

  const service = new ChunkIndexingService()

  const longContent = Array.from({ length: 8 }, (_, i) =>
    `Section ${i} de la note de test. `.repeat(60).trim(),
  ).join('\n\n')

  await test('première indexation → tous les fragments sont nouveaux', async () => {
    const result = await service.indexNote(testNoteId, 'Note de test', longContent)

    if (result.newFragments === 0)
      throw new Error(`attendu newFragments > 0, reçu ${result.newFragments}`)
    if (result.deleted !== 0)
      throw new Error(`attendu deleted=0, reçu ${result.deleted}`)
    if (result.skipped !== 0)
      throw new Error(`attendu skipped=0, reçu ${result.skipped}`)

    console.log(`    → ${result.newFragments} nouveaux, ${result.totalFragments} total`)
  })

  await test('deuxième indexation (même contenu) → tout skipped, 0 nouveau', async () => {
    const result = await service.indexNote(testNoteId, 'Note de test', longContent)

    if (result.newFragments !== 0)
      throw new Error(`attendu 0 nouveau, reçu ${result.newFragments}`)
    if (result.skipped === 0)
      throw new Error(`attendu skipped > 0, reçu ${result.skipped}`)
    if (result.deleted !== 0)
      throw new Error(`attendu deleted=0, reçu ${result.deleted}`)

    console.log(`    → ${result.skipped} skip, 0 nouveau ✓`)
  })

  await test('modification d\'une section → 1 nouveau, reste skip', async () => {
    const sections = Array.from({ length: 8 }, (_, i) =>
      `Section ${i === 3 ? 'MODIFIÉE' : i} de la note de test. `.repeat(60).trim(),
    )
    const modified = sections.join('\n\n')

    const result = await service.indexNote(testNoteId, 'Note de test', modified)

    if (result.newFragments === 0)
      throw new Error(`attendu au moins 1 nouveau fragment, reçu ${result.newFragments}`)
    if (result.deleted === 0)
      throw new Error(`attendu au moins 1 stale supprimé, reçu ${result.deleted}`)

    console.log(`    → ${result.newFragments} nouveau(x), ${result.skipped} skip, ${result.deleted} supprimé(s)`)
  })

  await test('suppression d\'une section → fragments stale nettoyés', async () => {
    const sections = Array.from({ length: 8 }, (_, i) =>
      `Section ${i} de la note de test. `.repeat(60).trim(),
    )
    await service.indexNote(testNoteId, 'Note de test', sections.join('\n\n'))

    const beforeCount = await prisma.noteEmbeddingChunk.count({
      where: { noteId: testNoteId },
    })

    const shorter = sections.slice(0, 4).join('\n\n')
    const result = await service.indexNote(testNoteId, 'Note de test', shorter)

    const afterCount = await prisma.noteEmbeddingChunk.count({
      where: { noteId: testNoteId },
    })

    if (afterCount >= beforeCount)
      throw new Error(`attendu count < ${beforeCount}, reçu ${afterCount}`)
    if (result.deleted === 0)
      throw new Error(`attendu deleted > 0, reçu ${result.deleted}`)

    console.log(`    → ${beforeCount} → ${afterCount} fragments (${result.deleted} supprimés)`)
  })

  await test('note vide → tous les fragments supprimés', async () => {
    await service.indexNote(testNoteId, 'Note de test', longContent)
    const result = await service.indexNote(testNoteId, '', '')

    const count = await prisma.noteEmbeddingChunk.count({
      where: { noteId: testNoteId },
    })

    if (count !== 0) throw new Error(`attendu 0 fragments, reçu ${count}`)
    console.log(`    → tous les fragments supprimés ✓`)
  })

  await test('deleteNoteChunks → supprime tout', async () => {
    await service.indexNote(testNoteId, 'Note de test', longContent)
    await service.deleteNoteChunks(testNoteId)

    const count = await prisma.noteEmbeddingChunk.count({
      where: { noteId: testNoteId },
    })
    if (count !== 0) throw new Error(`attendu 0, reçu ${count}`)
    console.log(`    → 0 fragment restant ✓`)
  })

  await test('hasChunks → détection correcte', async () => {
    const before = await service.hasChunks(testNoteId)
    if (before) throw new Error('attendu false avant indexation')

    await service.indexNote(testNoteId, 'Note de test', longContent)
    const after = await service.hasChunks(testNoteId)
    if (!after) throw new Error('attendu true après indexation')

    console.log(`    → false avant, true après ✓`)
  })

  await cleanup()
  restoreEmbedding()
  await prisma.$disconnect()

  console.log('\n=== Tests terminés ===')
}

main().catch(console.error)