// SPDX-License-Identifier: LicenseRef-ConusAI-Template-1.0
import type { Locale } from "@conusai-kit/i18n"
import { parseDecimalInput } from "@conusai-kit/i18n/values"
import { type InvoiceTerms, invoiceTerms } from "../contract/index.js"
/**
 * Merge edited fields, retaining all unedited terms/identifiers/notes/extensions. No float coercion: a price or a
 * rate is read as the person typed it in `locale` (`12,50` in LT) into the service's exact text; text that is not a
 * number is passed on as typed, so the contract refuses it by name.
 */
export function draftData(
  values: Record<string, string>,
  count: number,
  locale: Locale,
  prior?: InvoiceTerms,
): InvoiceTerms {
  const exact = (text: string | undefined) => (text ? (parseDecimalInput(text, locale)?.toString() ?? text) : text)
  const party = (side: "seller" | "buyer") => ({
    ...prior?.[side],
    reference: values[`${side}.reference`],
    name: values[`${side}.name`],
    vat_identifier: values[`${side}.vatValue`]
      ? { scheme: values[`${side}.vatScheme`], value: values[`${side}.vatValue`] }
      : null,
    endpoint: { scheme: values[`${side}.scheme`], value: values[`${side}.endpoint`] },
    address: {
      ...prior?.[side].address,
      country: values[`${side}.country`],
      street: values[`${side}.street`] || null,
      city: values[`${side}.city`] || null,
      postal_code: values[`${side}.postcode`] || null,
    },
  })
  return invoiceTerms.parse({
    ...prior,
    type_code: prior?.type_code ?? "380",
    series_id: values.series,
    currency: values.currency,
    issue_date: values.issueDate,
    due_date: values.dueDate || null,
    buyer_reference: values.buyerReference,
    seller: party("seller"),
    buyer: party("buyer"),
    lines: Array.from({ length: count }, (_, i) => ({
      ...prior?.lines[i],
      item_name: values[`line.${i}.name`],
      quantity: values[`line.${i}.quantity`],
      unit: values[`line.${i}.unit`],
      net_price: { currency: values.currency, amount: exact(values[`line.${i}.price`]) },
      vat_category: values[`line.${i}.category`],
      vat_rate: exact(values[`line.${i}.rate`]) || null,
      exemption_reason: values[`line.${i}.exemption`] || null,
    })),
  })
}