import 'dart:typed_data';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:printing/printing.dart';
import 'package:flux/features/tickets/models/ticket_model.dart';
import 'package:flux/features/company/models/company_model.dart';

class TicketPdfService {
  /// Funzione principale: Genera il PDF A4 con le due metà
  Future<Uint8List> generateTicketReceipt(
    TicketModel ticket,
    CompanyModel company,
  ) async {
    final pdf = pw.Document();

    // Carichiamo il font per essere sicuri che i caratteri siano ok
    final font = await PdfGoogleFonts.robotoRegular();
    final boldFont = await PdfGoogleFonts.robotoBold();

    pdf.addPage(
      pw.Page(
        pageFormat: PdfPageFormat.a4,
        margin: const pw.EdgeInsets.all(20),
        build: (context) {
          return pw.Column(
            children: [
              // 1. METÀ SUPERIORE: CLIENTE
              _buildTicketHalf(
                ticket,
                company,
                font,
                boldFont,
                isForCustomer: true,
              ),

              pw.SizedBox(height: 10),

              // Linea tratteggiata per il taglio
              pw.Container(
                margin: const pw.EdgeInsets.symmetric(vertical: 10),
                child: pw.Text(
                  '-' * 100,
                  style: const pw.TextStyle(color: PdfColors.grey400),
                ),
              ),

              pw.SizedBox(height: 10),

              // 2. METÀ INFERIORE: NEGOZIO
              _buildTicketHalf(
                ticket,
                company,
                font,
                boldFont,
                isForCustomer: false,
              ),
            ],
          );
        },
      ),
    );

    return pdf.save();
  }

  /// Helper per costruire una singola metà (Cliente o Negozio)
  pw.Widget _buildTicketHalf(
    TicketModel ticket,
    CompanyModel company,
    pw.Font font,
    pw.Font boldFont, {
    required bool isForCustomer,
  }) {
    return pw.Container(
      height: 380, // Circa metà A4 meno i margini
      child: pw.Column(
        crossAxisAlignment: pw.CrossAxisAlignment.start,
        children: [
          // HEADER: Logo e Dati Azienda (Solo per cliente o ID per negozio)
          pw.Row(
            mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
            children: [
              pw.Column(
                crossAxisAlignment: pw.CrossAxisAlignment.start,
                children: [
                  pw.Text(
                    company.name,
                    style: pw.TextStyle(font: boldFont, fontSize: 16),
                  ),
                  if (isForCustomer) ...[
                    pw.Text(
                      "${company.address}, ${company.city}",
                      style: const pw.TextStyle(fontSize: 10),
                    ),
                    pw.Text(
                      "P.IVA: ${company.vatId}",
                      style: const pw.TextStyle(fontSize: 10),
                    ),
                  ],
                ],
              ),
              pw.Row(
                children: [
                  pw.Column(
                    crossAxisAlignment: pw.CrossAxisAlignment.end,
                    children: [
                      pw.Text(
                        isForCustomer
                            ? "RICEVUTA CLIENTE"
                            : "COPIA INTERNA NEGOZIO",
                        style: pw.TextStyle(
                          font: boldFont,
                          fontSize: 12,
                          color: PdfColors.grey700,
                        ),
                      ),
                      pw.Text(
                        "Rif: ${ticket.referenceId}",
                        style: pw.TextStyle(font: boldFont, fontSize: 14),
                      ),
                      pw.Text(
                        "Data: ${ticket.createdAt?.toString().substring(0, 10) ?? ''}",
                        style: const pw.TextStyle(fontSize: 10),
                      ),
                    ],
                  ),
                  pw.SizedBox(width: 10),
                  // IL NOSTRO QR CODE MAGICO
                  pw.BarcodeWidget(
                    barcode: pw.Barcode.qrCode(),
                    data: ticket.id!, // Salviamo l'ID univoco nel QR!
                    width: 45,
                    height: 45,
                  ),
                ],
              ),
            ],
          ),

          pw.Divider(thickness: 1),
          pw.SizedBox(height: 10),

          // DATI CLIENTE
          pw.Row(
            children: [
              pw.Expanded(
                child: _infoBlock(
                  "CLIENTE",
                  ticket.customerName ?? 'Cliente Sconosciuto',
                  font,
                  boldFont,
                ),
              ),
              pw.Expanded(
                child: _infoBlock(
                  "CONTATTO ALTERNATIVO",
                  ticket.alternativePhoneNumber ?? 'N/D',
                  font,
                  boldFont,
                ),
              ),
            ],
          ),

          pw.SizedBox(height: 15),

          // DETTAGLI LAVORAZIONE
          _infoBlock(
            "DESCRIZIONE PROBLEMA / LAVORAZIONE RICHIESTA",
            ticket.request,
            font,
            boldFont,
          ),
          pw.SizedBox(height: 8),

          pw.Row(
            children: [
              pw.Expanded(
                child: _infoBlock(
                  "ACCESSORI CONSEGNATI",
                  ticket.includedAccessories ?? 'Nessuno',
                  font,
                  boldFont,
                ),
              ),
              pw.Expanded(
                child: _infoBlock(
                  "GARANZIA",
                  ticket.warrantyType?.displayValue ?? 'Standard',
                  font,
                  boldFont,
                ),
              ),
            ],
          ),

          pw.SizedBox(height: 15),

          // NOTE (Pubbliche o Private a seconda della copia)
          if (isForCustomer)
            _infoBlock("NOTE", ticket.publicNotes ?? '-', font, boldFont)
          else
            _infoBlock(
              "NOTE INTERNE (PRIVATE)",
              ticket.internalNotes ?? '-',
              font,
              boldFont,
            ),

          pw.Spacer(),

          // FOOTER: Disclaimer e Firma
          if (!isForCustomer) ...[
            pw.Text(
              "CONDIZIONI E LIBERATORIA:",
              style: pw.TextStyle(font: boldFont, fontSize: 8),
            ),
            pw.Text(
              company.ticketDisclaimer ??
                  'Firma per accettazione delle condizioni di riparazione.',
              style: const pw.TextStyle(fontSize: 7),
              textAlign: pw.TextAlign.justify,
            ),
            pw.SizedBox(height: 20),
            pw.Row(
              mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
              children: [
                pw.Container(
                  width: 150,
                  decoration: pw.BoxDecoration(
                    border: const pw.Border(top: pw.BorderSide(width: 0.5)),
                  ),
                ),
                pw.Text(
                  "Firma del Cliente per accettazione",
                  style: const pw.TextStyle(fontSize: 8),
                ),
              ],
            ),
          ] else
            pw.Align(
              alignment: pw.Alignment.centerRight,
              child: pw.Text(
                "Grazie per averci scelto!",
                style: pw.TextStyle(
                  font: font,
                  fontSize: 10,
                  fontStyle: pw.FontStyle.italic,
                ),
              ),
            ),
        ],
      ),
    );
  }

  pw.Widget _infoBlock(
    String label,
    String value,
    pw.Font font,
    pw.Font boldFont,
  ) {
    return pw.Column(
      crossAxisAlignment: pw.CrossAxisAlignment.start,
      children: [
        pw.Text(
          label,
          style: pw.TextStyle(
            font: boldFont,
            fontSize: 8,
            color: PdfColors.grey600,
          ),
        ),
        pw.Text(value, style: pw.TextStyle(font: font, fontSize: 11)),
      ],
    );
  }

  Future<Uint8List> generateLabelPdf(
    TicketModel ticket,
    CompanyModel company,
  ) async {
    final pdf = pw.Document();
    final font = await PdfGoogleFonts.robotoRegular();
    final boldFont = await PdfGoogleFonts.robotoBold();

    // Prendiamo le misure salvate (se custom) o usiamo default
    final widthMm = company.labelWidth ?? 62.0;
    final heightMm = company.labelHeight ?? 29.0;

    // Creiamo il formato fisico esatto!
    final format = company.isLabelVertical
        ? PdfPageFormat(heightMm * PdfPageFormat.mm, widthMm * PdfPageFormat.mm)
        : PdfPageFormat(
            widthMm * PdfPageFormat.mm,
            heightMm * PdfPageFormat.mm,
          );

    pdf.addPage(
      pw.Page(
        pageFormat: format,
        margin: const pw.EdgeInsets.all(2), // Margini minimi per le etichette
        build: (context) {
          return pw.Row(
            mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
            children: [
              pw.Expanded(
                child: pw.Column(
                  crossAxisAlignment: pw.CrossAxisAlignment.start,
                  mainAxisAlignment: pw.MainAxisAlignment.center,
                  children: [
                    pw.Text(
                      ticket.referenceId ?? '',
                      style: pw.TextStyle(font: boldFont, fontSize: 10),
                    ),
                    pw.Text(
                      ticket.customerName ?? 'Cliente sconosciuto',
                      style: pw.TextStyle(font: font, fontSize: 9),
                    ),
                    pw.Text(
                      ticket.createdAt?.toString().substring(0, 10) ?? '',
                      style: const pw.TextStyle(fontSize: 7),
                    ),
                  ],
                ),
              ),
              // QR Code compatto
              pw.BarcodeWidget(
                barcode: pw.Barcode.qrCode(),
                data: ticket.id!,
                width: 20,
                height: 20,
              ),
            ],
          );
        },
      ),
    );

    return pdf.save();
  }
}