/**
 * Sprint 16: OrgFactory — главная фабрика тестовых данных для regression.
 *
 * Создаёт через API за O(N) HTTP вызовов:
 *  - Organization + Admin user (signup),
 *  - access_token,
 *  - N товаров,
 *  - M контрагентов (опционально),
 *  - K документов (опционально).
 *
 * Возвращает один объект OrgSession + опционально кеш ссылок (refIds,
 * products, counterparties, supplies). Используется в каждом
 * regression-flow вместо повторного signup + form-fill.
 *
 * Дизайн: builder-pattern с цепочкой `.withProducts(N).withSupplies(M).build()`,
 * чтобы тест запросил ровно тот фикстур-набор который нужен. Без
 * "монстро-фабрики" которая всегда делает всё.
 */
import { ApiError, request, sleep } from './api-client.js'
import {
  Endpoints,
  type CounterpartyRef,
  type DocumentRef,
  type OrgSession,
  type ProductRef,
  type RefIds,
} from './types.js'

interface SignupResult {
  organizationId: string
  email: string
}

interface TokenResult {
  access_token: string
  refresh_token: string
}

export interface BuiltOrg {
  session: OrgSession
  refs: RefIds
  products: ProductRef[]
  counterparties: CounterpartyRef[]
  supplies: DocumentRef[]
  /** Headers с Bearer-токеном для запросов из теста. */
  authHeaders: { Authorization: string; 'Content-Type': string }
}

interface FactoryOptions {
  productsCount: number
  counterpartiesCount: number
  /** Создать приёмки (Supply.Post) — N штук. У каждой одна линия с productCount/N
   * товарами по 100шт. Без них товары будут без остатка. */
  suppliesCount: number
  /** Префикс для slug'а (email/orgName) — удобно для дебага. */
  slug: string
}

const DEFAULT_OPTS: FactoryOptions = {
  productsCount: 0,
  counterpartiesCount: 0,
  suppliesCount: 0,
  slug: 'reg',
}

export class OrgFactory {
  private opts: FactoryOptions = { ...DEFAULT_OPTS }

  static for(slug: string): OrgFactory {
    const f = new OrgFactory()
    f.opts.slug = slug
    return f
  }

  withProducts(n: number): this { this.opts.productsCount = n; return this }
  withCounterparties(n: number): this { this.opts.counterpartiesCount = n; return this }
  withSupplies(n: number): this { this.opts.suppliesCount = n; return this }

  async build(): Promise<BuiltOrg> {
    const { slug } = this.opts
    const ts = Date.now() + Math.floor(Math.random() * 9999)
    const email = `${slug}-${ts}@food-market.local`
    const password = 'RegTest12345!'
    const orgName = `Reg-${slug}-${ts}`

    // 1) Signup. Сервер rate-limit'ит signup (Sprint 13: 3/час/IP на prod,
    // 30/час/IP на stage env). Под нагрузкой ждём + повторяем.
    const signup = await this.signupWithRetry(email, password, orgName)

    // 2) Token.
    const token = await this.getToken(email, password)

    // 3) Refs (units / groups / stores / retail-points / currencies / price-types).
    const refs = await this.loadRefs(token.access_token)

    const built: BuiltOrg = {
      session: {
        email, password, orgName,
        orgId: signup.organizationId,
        accessToken: token.access_token,
        refreshToken: token.refresh_token,
      },
      refs,
      products: [],
      counterparties: [],
      supplies: [],
      authHeaders: {
        Authorization: `Bearer ${token.access_token}`,
        'Content-Type': 'application/json',
      },
    }

    // 4) Products (опц.).
    if (this.opts.productsCount > 0) {
      built.products = await this.createProducts(token.access_token, refs, this.opts.productsCount)
    }

    // 5) Counterparties (опц.).
    if (this.opts.counterpartiesCount > 0) {
      built.counterparties = await this.createCounterparties(token.access_token, this.opts.counterpartiesCount)
    }

    // 6) Supplies (опц.) — нужны для тестов на остаток/продажу.
    if (this.opts.suppliesCount > 0) {
      if (built.products.length === 0)
        throw new Error('Supplies require at least 1 product — call .withProducts(N) first')
      if (built.counterparties.length === 0) {
        // авто-создаём 1 поставщика чтобы supplyлогика не падала
        built.counterparties = await this.createCounterparties(token.access_token, 1)
      }
      built.supplies = await this.createPostedSupplies(token.access_token, refs, built, this.opts.suppliesCount)
    }

    return built
  }

  // ─ private helpers ────────────────────────────────────────────────────

  private async signupWithRetry(email: string, password: string, orgName: string): Promise<SignupResult> {
    return await this.retryOn429(4, () => request<SignupResult>(Endpoints.signup, {
      body: { email, password, organizationName: orgName, phone: '+77001234567' },
    }))
  }

  /**
   * Sprint 26: общий retry-helper для 429-ответов. Honors Retry-After header
   * если сервер прислал; иначе короткий backoff с jitter (1-3s × attempt).
   * Stage rate-limit поднят до 5000/min, поэтому реально 429 ловить почти
   * не должны — этот retry на крайний случай.
   */
  private async retryOn429<T>(maxAttempts: number, fn: () => Promise<T>): Promise<T> {
    let lastErr: unknown
    for (let i = 0; i < maxAttempts; i++) {
      try {
        return await fn()
      } catch (e) {
        if (e instanceof ApiError && e.status === 429) {
          const headerDelay = (e.retryAfterSec ?? 0) * 1000
          const backoff = 1_000 + i * 1_500 + Math.floor(Math.random() * 1_000) // 1-2s, 2.5-3.5s, 4-5s, 5.5-6.5s
          await sleep(Math.min(Math.max(headerDelay, backoff), 8_000))
          lastErr = e
          continue
        }
        throw e
      }
    }
    throw lastErr ?? new Error('429 retry exhausted')
  }

  private async getToken(email: string, password: string): Promise<TokenResult> {
    const body = new URLSearchParams({
      grant_type: 'password',
      username: email,
      password,
      client_id: 'food-market-web',
      scope: 'openid profile email roles api offline_access',
    }).toString()
    return await this.retryOn429(8, () => request<TokenResult>(Endpoints.token, {
      body,
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    }))
  }

  private async loadRefs(token: string): Promise<RefIds> {
    interface Paged<T> { items: T[] }
    interface ItemBase { id: string }
    interface Unit extends ItemBase { code: string }
    interface PriceType extends ItemBase { isRetail: boolean }
    interface Currency extends ItemBase { code: string }
    interface Store extends ItemBase { isMain: boolean }

    const [units, groups, stores, rps, curs, pts] = await Promise.all([
      request<Paged<Unit>>(Endpoints.refs.units, { token }),
      request<Paged<ItemBase>>(Endpoints.refs.groups, { token }),
      request<Paged<Store>>(Endpoints.refs.stores, { token }),
      request<Paged<ItemBase>>(Endpoints.refs.retailPoints, { token }),
      request<Paged<Currency>>(Endpoints.refs.currencies, { token }),
      request<Paged<PriceType>>(Endpoints.refs.priceTypes, { token }),
    ])
    const unit = units.items.find(u => u.code === '796') ?? units.items[0]
    const group = groups.items[0]
    const store = stores.items.find(s => s.isMain) ?? stores.items[0]
    const rp = rps.items[0]
    const cur = curs.items.find(c => c.code === 'KZT') ?? curs.items[0]
    const pt = pts.items.find(p => p.isRetail) ?? pts.items[0]
    if (!unit || !group || !store || !rp || !cur || !pt) {
      throw new Error(`refs incomplete: unit=${!!unit} group=${!!group} store=${!!store} rp=${!!rp} cur=${!!cur} pt=${!!pt}`)
    }
    return {
      unitId: unit.id, groupId: group.id,
      storeId: store.id, retailPointId: rp.id,
      currencyId: cur.id, priceTypeId: pt.id,
    }
  }

  private async createProducts(token: string, refs: RefIds, n: number): Promise<ProductRef[]> {
    const out: ProductRef[] = []
    for (let i = 0; i < n; i++) {
      const name = `Товар ${i + 1}`
      const article = `ART-${this.opts.slug}-${Date.now()}-${i}`
      const barcode = this.randomBarcode()
      const product = await request<{ id: string }>(Endpoints.products, {
        token,
        body: {
          name, article, unitOfMeasureId: refs.unitId,
          vat: 12, vatEnabled: true,
          productGroupId: refs.groupId,
          packaging: 1,
          prices: [{ priceTypeId: refs.priceTypeId, amount: 100 + i * 10, currencyId: refs.currencyId }],
          barcodes: [{ code: barcode, type: 1, isPrimary: true }],
        },
      })
      out.push({ id: product.id, name, article })
    }
    return out
  }

  private async createCounterparties(token: string, n: number): Promise<CounterpartyRef[]> {
    const out: CounterpartyRef[] = []
    for (let i = 0; i < n; i++) {
      const name = `Контрагент ${i + 1}`
      // Чередуем типы: чётные — юрлица, нечётные — физлица.
      const type = i % 2 === 0 ? 1 : 2
      const cp = await request<{ id: string }>(Endpoints.counterparties, {
        token,
        body: { name, type, bin: type === 1 ? '123456789012' : null },
      })
      out.push({ id: cp.id, name, type })
    }
    return out
  }

  private async createPostedSupplies(
    token: string, refs: RefIds, built: BuiltOrg, n: number,
  ): Promise<DocumentRef[]> {
    const supplier = built.counterparties[0]!
    const out: DocumentRef[] = []
    // На каждую приёмку — все products с qty 100 / unitPrice 50.
    // Это даёт быстрый stock=100×N для дальнейших sales-flow.
    const lines = built.products.map(p => ({
      productId: p.id, quantity: 100, unitPrice: 50,
    }))
    for (let i = 0; i < n; i++) {
      const draft = await request<{ id: string; number: string }>(Endpoints.supplies, {
        token,
        body: {
          date: new Date().toISOString(),
          supplierId: supplier.id,
          storeId: refs.storeId,
          currencyId: refs.currencyId,
          lines,
        },
      })
      // Post — отдельный endpoint, NoContent на успехе.
      await request(`${Endpoints.supplies}/${draft.id}/post`, { token, method: 'POST' })
      out.push({ id: draft.id, number: draft.number })
    }
    return out
  }

  private randomBarcode(): string {
    let s = ''
    for (let i = 0; i < 13; i++) s += Math.floor(Math.random() * 10)
    return s
  }
}