conalep_pos_flutter/lib/views/pedido/pedido_ticket.dart

import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:provider/provider.dart';
import '../../models/models.dart';
import '../../viewmodels/viewmodels.dart';
import 'package:printing/printing.dart';
import 'package:flutter/services.dart' show rootBundle;

Future<void> imprimirTicketsJuntos(BuildContext context, Pedido pedido) async {
  bool ticketCocinaActivo =
      await Provider.of<VariableViewModel>(context, listen: false)
          .isVariableActive('ticket_cocina');
  bool ticketVentaActivo =
      await Provider.of<VariableViewModel>(context, listen: false)
          .isVariableActive('ticket_venta');
  final pdf = pw.Document();
  final image = pw.MemoryImage(
    (await rootBundle.load('assets/icono-BN.png')).buffer.asUint8List(),
  );

  if (ticketVentaActivo) {
    pdf.addPage(
      generarPaginaPrimerTicket(pedido, image),
    );
  }

  if (ticketCocinaActivo) {
    final paginaSegundoTicket =
        await generarPaginaSegundoTicket(context, pedido);
    pdf.addPage(paginaSegundoTicket);
  }

  await printPdf(Uint8List.fromList(await pdf.save()));
}

pw.Page generarPaginaPrimerTicket(Pedido pedido, pw.MemoryImage image) {
  final numberFormat = NumberFormat('#,##0.00', 'es_MX');

  double totalSinDescuento = 0;
  double totalConDescuento = 0;
  double descuento = pedido.descuento?.toDouble() ?? 0.0;
  double precioDescuento = 0;

  final productList = pedido.productos
      .map(
        (producto) {
          final productPrice = double.parse(producto.producto?.precio ?? '0');
          final productTotal = productPrice * (producto.cantidad ?? 1);

          totalSinDescuento += productTotal;

          final toppingsList = producto.toppings.where((topping) {
            final toppingPrice = double.parse(topping.topping?.precio ?? '0');
            return toppingPrice > 0;
          }).map((topping) {
            final toppingPrice = double.parse(topping.topping?.precio ?? '0');
            totalSinDescuento += toppingPrice * (producto.cantidad ?? 1);

            return pw.Row(
              children: [
                pw.Text(
                    '- ${topping.topping?.nombre ?? "Topping no especificado"}',
                    style: const pw.TextStyle(fontSize: 8)),
                pw.Spacer(),
                pw.Text('\$${numberFormat.format(toppingPrice)}',
                    style: const pw.TextStyle(fontSize: 8)),
              ],
            );
          }).toList();

          return [
            pw.Row(
              mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
              children: [
                pw.Expanded(
                  flex: 2,
                  child: pw.Text(
                      producto.producto?.nombre ?? "Producto no especificado",
                      style: const pw.TextStyle(fontSize: 8)),
                ),
                pw.Expanded(
                  flex: 1,
                  child: pw.Text('x${producto.cantidad}',
                      style: const pw.TextStyle(fontSize: 8)),
                ),
                pw.Padding(
                  padding: pw.EdgeInsets.only(right: 2),
                  child: pw.Text('\$${numberFormat.format(productPrice)}',
                      style: const pw.TextStyle(fontSize: 8)),
                )
              ],
            ),
            ...toppingsList,
          ];
        },
      )
      .expand((e) => e)
      .toList();

  precioDescuento = totalSinDescuento * (descuento / 100);
  totalConDescuento = totalSinDescuento - precioDescuento;

  return pw.Page(
      pageFormat: PdfPageFormat.roll57,
      margin: pw.EdgeInsets.all(5),
      build: (pw.Context context) {
        return pw.Column(
            crossAxisAlignment: pw.CrossAxisAlignment.center,
            children: [
              pw.Center(child: pw.Image(image, width: 50, height: 50)),
              pw.SizedBox(height: 5),
              pw.Text('Fecha: ${pedido.peticion}',
                  style: const pw.TextStyle(fontSize: 8)),
              pw.Text('Conalep', style: const pw.TextStyle(fontSize: 8)),
              pw.Text('Hermosillo', style: const pw.TextStyle(fontSize: 8)),
              pw.SizedBox(height: 5),
              pw.Text('Pedido: ${pedido.folio}',
                  style: pw.TextStyle(
                      fontWeight: pw.FontWeight.bold, fontSize: 9)),
              pw.SizedBox(height: 5),
              pw.Column(children: productList),
              pw.Divider(),
              pw.Row(
                mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
                children: [
                  pw.Text('Subtotal:',
                      style: pw.TextStyle(
                          fontWeight: pw.FontWeight.bold, fontSize: 8)),
                  pw.Text('\$${numberFormat.format(totalSinDescuento)}',
                      style: pw.TextStyle(
                          fontWeight: pw.FontWeight.bold, fontSize: 8)),
                ],
              ),
              if (descuento > 0) ...[
                pw.Row(
                  mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
                  children: [
                    pw.Text('Descuento:',
                        style: pw.TextStyle(
                            fontWeight: pw.FontWeight.bold, fontSize: 8)),
                    pw.Text('-\$${numberFormat.format(precioDescuento)}',
                        style: pw.TextStyle(
                            fontWeight: pw.FontWeight.bold, fontSize: 8)),
                  ],
                ),
              ],
              pw.Row(
                mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
                children: [
                  pw.Text('Total:',
                      style: pw.TextStyle(
                          fontWeight: pw.FontWeight.bold, fontSize: 8)),
                  pw.Text('\$${numberFormat.format(totalConDescuento)}',
                      style: pw.TextStyle(
                          fontWeight: pw.FontWeight.bold, fontSize: 8)),
                ],
              ),
              pw.SizedBox(height: 5),
              pw.Text('¡GRACIAS POR SU COMPRA!',
                  style: pw.TextStyle(
                      fontSize: 7, fontWeight: pw.FontWeight.bold)),
              pw.Divider(),
            ]);
      });
}

Future<pw.Page> generarPaginaSegundoTicket(
    BuildContext context, Pedido pedido) async {
  final numberFormat = NumberFormat('#,##0.00', 'es_MX');
  double subtotal = 0;
  double totalConDescuento = 0;
  double descuento = pedido.descuento?.toDouble() ?? 0.0;
  double precioDescuento = 0;

  final sucursalVariable =
      await Provider.of<VariableViewModel>(context, listen: false)
          .getVariableByClave('sucursal');
  final sucursalDescripcion = sucursalVariable?.descripcion ?? '';

  List<pw.Widget> content = [
    pw.Row(
      mainAxisAlignment: pw.MainAxisAlignment.spaceAround,
      children: [
        pw.Text('${pedido.folio}/ ',
            style: pw.TextStyle(fontSize: 7, fontWeight: pw.FontWeight.bold)),
        if (sucursalDescripcion.isNotEmpty)
          pw.Text('$sucursalDescripcion/ ',
              style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)),
        pw.Text('${pedido.peticion}',
            style: pw.TextStyle(fontSize: 7, fontWeight: pw.FontWeight.bold)),
      ],
    ),
    pw.SizedBox(height: 2),
    if (pedido.nombreCliente != null && pedido.nombreCliente!.isNotEmpty)
      pw.Text('Cliente: ${pedido.nombreCliente}',
          style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)),
    pw.SizedBox(height: 2),
  ];

  // Mostrar los productos con la cantidad, el precio total y el precio de los toppings
  content.addAll(pedido.productos
      .map((producto) {
        final productPrice = double.parse(producto.producto?.precio ?? '0');
        final productTotal = productPrice * (producto.cantidad ?? 1);
        subtotal += productTotal;

        final toppingsList = producto.toppings.map((topping) {
          final toppingPrice = double.parse(topping.topping?.precio ?? '0');
          final toppingTotal = toppingPrice * (producto.cantidad ?? 1);
          subtotal += toppingTotal;

          return pw.Row(
            mainAxisAlignment: pw.MainAxisAlignment.start,
            children: [
              pw.Expanded(
                flex: 3,
                child: pw.Text(
                    '-${topping.topping?.nombre ?? "Topping no especificado"}',
                    style: const pw.TextStyle(fontSize: 6)),
              ),
              if (toppingPrice > 0)
                pw.Expanded(
                  flex: 1,
                  child: pw.Text(
                    '\$${numberFormat.format(toppingTotal)}',
                    style: const pw.TextStyle(fontSize: 6),
                    textAlign: pw.TextAlign.right,
                  ),
                ),
            ],
          );
        }).toList();

        return [
          pw.Row(
            mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
            children: [
              pw.Expanded(
                flex: 1,
                child: pw.Text('${producto.cantidad}',
                    style: const pw.TextStyle(fontSize: 7)),
              ),
              pw.Expanded(
                flex: 5,
                child: pw.Text(
                    producto.producto?.nombre ?? "Producto no especificado",
                    style: const pw.TextStyle(fontSize: 7)),
              ),
              pw.Expanded(
                  flex: 2,
                  child: pw.Align(
                    alignment: pw.Alignment.centerRight,
                    child: pw.Text(
                      '\$${numberFormat.format(productTotal)}',
                      style: const pw.TextStyle(fontSize: 7),
                    ),
                  )),
            ],
          ),
          ...toppingsList,
        ];
      })
      .expand((e) => e)
      .toList());

  // Calcular el descuento y el total final
  precioDescuento = subtotal * (descuento / 100);
  totalConDescuento = subtotal - precioDescuento;

  content.add(pw.Divider());

  if (descuento > 0) {
    content.addAll([
      pw.Row(
        mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
        children: [
          pw.Text('Subtotal:',
              style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)),
          pw.Text('\$${numberFormat.format(subtotal)}',
              style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)),
        ],
      ),
      pw.Row(
        mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
        children: [
          pw.Text('Descuento:',
              style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)),
          pw.Text('-\$${numberFormat.format(precioDescuento)}',
              style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)),
        ],
      ),
    ]);
  }

  content.add(
    pw.Row(
      mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
      children: [
        pw.Text('Total:',
            style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)),
        pw.Text(
            '\$${numberFormat.format(descuento > 0 ? totalConDescuento : subtotal)}',
            style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)),
      ],
    ),
  );

  if (pedido.comentarios != null && pedido.comentarios!.isNotEmpty) {
    content.add(pw.SizedBox(height: 1));
    content.add(pw.Text('Comentarios:',
        style: pw.TextStyle(fontWeight: pw.FontWeight.bold, fontSize: 7)));
    content.add(pw.Padding(
      padding: const pw.EdgeInsets.only(right: 15),
      child:
          pw.Text(pedido.comentarios!, style: const pw.TextStyle(fontSize: 7)),
    ));
  }

  content.add(pw.SizedBox(height: 1));

  return pw.Page(
    pageFormat: PdfPageFormat.roll57,
    margin: pw.EdgeInsets.all(5),
    build: (pw.Context context) {
      return pw.Column(
          crossAxisAlignment: pw.CrossAxisAlignment.center, children: content);
    },
  );
}

Future<void> printPdf(Uint8List pdfBytes) async {
  await Printing.layoutPdf(
    onLayout: (PdfPageFormat format) => pdfBytes,
  );
}