/**
 * @module tests/unit/utils/metadataIndex-nested-orderby
 * @description THE NESTED-FIELD ADDRESSING PIN for ordered reads (the
 * field-addressing law, dotted-path clause). The defect this keeps dead:
 * `orderBy` on a nested user metadata field (dotted path, e.g.
 * `orderBy: 'profile.score'` over `metadata: { profile: { score: 7 } }`)
 * silently returned insertion order — a no-op sort — because the sort
 * path's value resolution read flat bag keys only. The law: a dotted user
 * address is either SERVED CORRECTLY (the batched resolver walks inside
 * the bag) or REFUSED with a typed UnresolvableFieldError — never a silent
 * pass-through. Both spellings (`profile.score` / `metadata.profile.score`)
 * are the same address; the filter side (`where: { 'profile.score': … }`)
 * obeys the same law.
 */
import { describe, it, expect, beforeAll, afterAll } from 'vitest'
import { Brainy, UnresolvableFieldError } from '../../../src/index.js'
import { NounType } from '../../../src/types/graphTypes.js'

const ROWS = 30

describe('nested (dotted-path) user field orderBy — the field-addressing law', () => {
  let brain: Brainy
  /** id → nested score, for the rows that carry profile.score */
  const scoreById = new Map<string, number>()
  /** ids of the two rows WITHOUT a profile bag */
  let noProfileIds: string[] = []

  beforeAll(async () => {
    brain = new Brainy({ storage: { type: 'memory' }, requireSubtype: false })
    await brain.init()
    for (let i = 0; i < ROWS; i++) {
      // (i * 11) % 30 is a permutation of 0..29 (gcd(11,30)=1): every score
      // distinct, insertion order maximally different from value order — a
      // silent insertion-order pass-through cannot accidentally look sorted.
      const score = (i * 11) % ROWS
      const id = await brain.add({
        data: `row ${i}`,
        type: NounType.Document,
        metadata: { profile: { score }, plain: i }
      })
      scoreById.set(id, score)
    }
    const a = await brain.add({
      data: 'no-profile a',
      type: NounType.Document,
      metadata: { plain: 1000 }
    })
    const b = await brain.add({
      data: 'no-profile b',
      type: NounType.Document,
      metadata: { plain: 1001 }
    })
    noProfileIds = [a, b].sort()
  }, 120000)

  afterAll(async () => {
    await brain.close().catch(() => {})
  })

  /** Assert one complete ordered read against the sealed ordering contract. */
  function assertOrdered(
    rows: Array<{ id: string }>,
    order: 'asc' | 'desc',
    label: string
  ): void {
    // Rows are NEVER dropped: all 30 scored + 2 profile-less rows come back.
    expect(rows.length, `${label}: complete result`).toBe(ROWS + 2)

    // Missing-value rows sort LAST in BOTH directions, ties by id ascending.
    const lastTwo = rows.slice(-2).map((r) => r.id)
    expect(lastTwo, `${label}: missing-value rows LAST, id asc`).toEqual(noProfileIds)

    // The scored 30 are ordered by the NESTED value — the exact permutation,
    // not insertion order.
    const observed = rows.slice(0, ROWS).map((r) => scoreById.get(r.id))
    const wanted = [...scoreById.values()].sort((x, y) =>
      order === 'asc' ? x - y : y - x
    )
    expect(observed, `${label}: nested values in ${order} order`).toEqual(wanted)
  }

  it('orderBy: "profile.score" desc — served correctly, missing rows LAST (never a silent insertion-order no-op)', async () => {
    const rows = await brain.find({
      type: NounType.Document,
      orderBy: 'profile.score',
      order: 'desc',
      limit: 40
    })
    assertOrdered(rows, 'desc', 'bare dotted, desc')
  })

  it('orderBy: "profile.score" asc — same law in the other direction', async () => {
    const rows = await brain.find({
      type: NounType.Document,
      orderBy: 'profile.score',
      order: 'asc',
      limit: 40
    })
    assertOrdered(rows, 'asc', 'bare dotted, asc')
  })

  it('explicit spelling "metadata.profile.score" is the SAME address — identical result', async () => {
    const bare = await brain.find({
      type: NounType.Document,
      orderBy: 'profile.score',
      order: 'desc',
      limit: 40
    })
    const explicit = await brain.find({
      type: NounType.Document,
      orderBy: 'metadata.profile.score',
      order: 'desc',
      limit: 40
    })
    assertOrdered(explicit, 'desc', 'metadata.-prefixed, desc')
    expect(
      explicit.map((r) => r.id),
      'both spellings resolve to the identical ordered id sequence'
    ).toEqual(bare.map((r) => r.id))
  })

  it('a dotted path carried by NO entity REFUSES with UnresolvableFieldError — never a silent insertion-order return', async () => {
    await expect(
      brain.find({
        type: NounType.Document,
        orderBy: 'no.such.path',
        order: 'desc',
        limit: 40
      })
    ).rejects.toThrow(UnresolvableFieldError)
  })

  it('dotted where: { "profile.score": 7 } finds exactly the right row — the filter side of the same law', async () => {
    const wantedId = [...scoreById.entries()].find(([, s]) => s === 7)![0]
    const rows = await brain.find({
      type: NounType.Document,
      where: { 'profile.score': 7 },
      limit: 40
    })
    expect(rows.map((r) => r.id)).toEqual([wantedId])
  })
})