import { Injectable } from '@nestjs/common'

@Injectable()
export class SharedSaleInvoicePaginationService {
  normalize(
    page: number = 1,
    perPage: number = 10,
    defaultPerPage: number = 10,
    maxPerPage: number = 50,
  ) {
    const normalizedPageValue = Number(page ?? 1)
    const normalizedPage = Number.isFinite(normalizedPageValue)
      ? Math.max(1, Math.floor(normalizedPageValue))
      : 1

    const requestedPerPageValue = Number(perPage ?? defaultPerPage)
    const requestedPerPage = Number.isFinite(requestedPerPageValue)
      ? Math.max(1, Math.floor(requestedPerPageValue))
      : defaultPerPage
    const normalizedPerPage = Math.min(requestedPerPage, maxPerPage)

    return {
      page: normalizedPage,
      perPage: normalizedPerPage,
      skip: (normalizedPage - 1) * normalizedPerPage,
      take: normalizedPerPage,
    }
  }
}