/**
 * ════════════════════════════════════════════════════════════
 * مُصادَق (Musadaq) — UBL 2.1 Generator Service
 * ════════════════════════════════════════════════════════════
 * يقوم بإنشاء ملفات XML المتوافقة مع معيار UBL 2.1 المطلوبة من
 * دائرة ضريبة الدخل والمبيعات الأردنية (ISTD).
 * ════════════════════════════════════════════════════════════
 */

import { Injectable } from '@nestjs/common';
import { create } from 'xmlbuilder2';
import { Invoice } from './entities/invoice.entity';

@Injectable()
export class UBLGeneratorService {
  /**
   * توليد UBL 2.1 XML لفاتورة مبيعات
   */
  generateXML(invoice: Invoice, company: any): string {
    const doc = create({ version: '1.0', encoding: 'UTF-8' })
      .ele('Invoice', {
        xmlns: 'urn:oasis:names:specification:ubl:schema:xsd:Invoice-2',
        'xmlns:cac': 'urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2',
        'xmlns:cbc': 'urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2',
      })
      .ele('cbc:UBLVersionID').txt('2.1').up()
      .ele('cbc:CustomizationID').txt('TRX-1.0').up()
      .ele('cbc:ID').txt(invoice.invoice_number || 'N/A').up()
      .ele('cbc:IssueDate').txt(invoice.invoice_date?.toISOString().split('T')[0] || '').up()
      .ele('cbc:InvoiceTypeCode').txt(invoice.ubl_type_code).up()
      .ele('cbc:DocumentCurrencyCode').txt(invoice.currency_code).up()

      // ── AccountingSupplierParty (المُصدر) ───────────────
      .ele('cac:AccountingSupplierParty')
      .ele('cac:Party')
      .ele('cac:PartyIdentification')
      .ele('cbc:ID').txt(company.tax_identification_number).up()
      .up()
      .ele('cac:PartyName')
      .ele('cbc:Name').txt(company.name).up()
      .up()
      .ele('cac:PostalAddress')
      .ele('cbc:StreetName').txt(company.address || '').up()
      .ele('cac:Country')
      .ele('cbc:IdentificationCode').txt('JO').up()
      .up()
      .up()
      .up()
      .up()

      // ── AccountingCustomerParty (المشتري) ───────────────
      .ele('cac:AccountingCustomerParty')
      .ele('cac:Party')
      .ele('cac:PartyIdentification')
      .ele('cbc:ID').txt(invoice.buyer_tin || invoice.buyer_national_id || '').up()
      .up()
      .ele('cac:PartyName')
      .ele('cbc:Name').txt(invoice.buyer_name || '').up()
      .up()
      .up()
      .up()

      // ── TaxTotal ───────────────────────────────────────
      .ele('cac:TaxTotal')
      .ele('cbc:TaxAmount', { currencyID: invoice.currency_code }).txt(invoice.tax_amount.toString()).up()
      .up()

      // ── LegalMonetaryTotal ─────────────────────────────
      .ele('cac:LegalMonetaryTotal')
      .ele('cbc:LineExtensionAmount', { currencyID: invoice.currency_code }).txt(invoice.subtotal.toString()).up()
      .ele('cbc:TaxExclusiveAmount', { currencyID: invoice.currency_code }).txt(invoice.subtotal.toString()).up()
      .ele('cbc:TaxInclusiveAmount', { currencyID: invoice.currency_code }).txt(invoice.grand_total.toString()).up()
      .ele('cbc:PayableAmount', { currencyID: invoice.currency_code }).txt(invoice.grand_total.toString()).up()
      .up();

    // ── InvoiceLines ─────────────────────────────────────
    invoice.lines.forEach((line) => {
      doc.ele('cac:InvoiceLine')
        .ele('cbc:ID').txt(line.line_number.toString()).up()
        .ele('cbc:InvoicedQuantity', { unitCode: 'PCE' }).txt(line.quantity.toString()).up()
        .ele('cbc:LineExtensionAmount', { currencyID: invoice.currency_code }).txt(line.line_total.toString()).up()
        .ele('cac:Item')
        .ele('cbc:Description').txt(line.description).up()
        .up()
        .ele('cac:Price')
        .ele('cbc:PriceAmount', { currencyID: invoice.currency_code }).txt(line.unit_price.toString()).up()
        .up()
        .up();
    });

    return doc.end({ prettyPrint: true });
  }
}