import 'dart:typed_data';
import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:cashumit/models/receipt_item.dart';
import 'package:cashumit/utils/currency_format.dart';

/// Data yang dibutuhkan untuk merender invoice.
class InvoiceData {
  final String invoiceNumber;
  final String storeName;
  final String storeAddress;
  final String adminName;
  final String adminPhone;
  final Uint8List? logoBytes;
  final Uint8List? qrisBytes;

  /// Gambar yang sudah didecode agar bisa dirender sinkron saat offscreen
  /// render (Image.memory bersifat async sehingga bisa tampil kosong).
  final ui.Image? logoImage;
  final ui.Image? qrisImage;
  final String customerName; // DITAGIH KEPADA
  final DateTime date;
  final List<ReceiptItem> items;
  final double total;
  final double tipAmount;
  final String disclaimer;
  final String thankYouText;
  final String pantunText;

  InvoiceData({
    required this.invoiceNumber,
    required this.storeName,
    required this.storeAddress,
    required this.adminName,
    required this.adminPhone,
    this.logoBytes,
    this.qrisBytes,
    this.logoImage,
    this.qrisImage,
    required this.customerName,
    required this.date,
    required this.items,
    required this.total,
    this.tipAmount = 0.0,
    this.disclaimer = '',
    this.thankYouText = '',
    this.pantunText = '',
  });

  double get subtotal => items.fold(0.0, (s, i) => s + i.total);

  double get grandTotal => subtotal + tipAmount;
}

/// Widget invoice sesuai contoh (lebar tetap, background putih).
class InvoiceImageWidget extends StatelessWidget {
  final InvoiceData data;

  const InvoiceImageWidget({super.key, required this.data});

  @override
  Widget build(BuildContext context) {
    const months = [
      'Jan', 'Feb', 'Mar', 'Apr', 'Mei', 'Jun',
      'Jul', 'Agu', 'Sep', 'Okt', 'Nov', 'Des'
    ];
    final d = data.date;
    final dateStr =
        '${d.day} ${months[d.month - 1]} ${d.year}, ${d.hour.toString().padLeft(2, '0')}:${d.minute.toString().padLeft(2, '0')}';
    final rupiah = (num v) => CurrencyFormat.formatRupiah(v);

    return Container(
      width: 420,
      padding: const EdgeInsets.all(20),
      color: Colors.white,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        mainAxisSize: MainAxisSize.min,
        children: [
          // Header
          Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    if (data.logoImage != null)
                      ClipRRect(
                        borderRadius: BorderRadius.circular(12),
                        child: RawImage(
                          image: data.logoImage,
                          width: 72,
                          height: 72,
                          fit: BoxFit.cover,
                        ),
                      )
                    else if (data.logoBytes != null)
                      ClipRRect(
                        borderRadius: BorderRadius.circular(12),
                        child: Image.memory(
                          data.logoBytes!,
                          width: 72,
                          height: 72,
                          fit: BoxFit.cover,
                          errorBuilder: (_, __, ___) =>
                              _logoFallback(data.storeName),
                        ),
                      )
                    else
                      _logoFallback(data.storeName),
                    const SizedBox(height: 10),
                    _storeHeader(data),
                  ],
                ),
              ),
              const SizedBox(width: 12),
              const Text('INVOICE',
                  textAlign: TextAlign.right,
                  style: TextStyle(
                      fontSize: 26,
                      fontWeight: FontWeight.w800,
                      color: Colors.black)),
            ],
          ),
          const SizedBox(height: 16),
          // Kartu info
          Container(
            padding: const EdgeInsets.all(14),
            decoration: BoxDecoration(
              color: const Color(0xFFF2F2F2),
              borderRadius: BorderRadius.circular(12),
            ),
            child: Column(
              children: [
                _infoRow('DITAGIH KEPADA', data.customerName),
                const SizedBox(height: 8),
                _infoRow('NO. FAKTUR', data.invoiceNumber),
                const SizedBox(height: 8),
                _infoRow('DITERBITKAN', dateStr),
              ],
            ),
          ),
          const SizedBox(height: 16),
          // Tabel
          DefaultTextStyle(
            style: const TextStyle(color: Colors.black, fontSize: 12),
            child: Table(
              columnWidths: const {
                0: FlexColumnWidth(2.6),
                1: FlexColumnWidth(1.2),
                2: FlexColumnWidth(1.0),
                3: FlexColumnWidth(1.4),
              },
              children: [
                TableRow(
                  decoration: const BoxDecoration(
                    border: Border(bottom: BorderSide(color: Colors.black12)),
                  ),
                  children: [
                    _th('BARANG'),
                    _th('HARGA', align: TextAlign.center),
                    _th('KUANTITAS', align: TextAlign.center),
                    _th('JUMLAH', align: TextAlign.right),
                  ],
                ),
                ...data.items.map((it) => TableRow(
                      children: [
                        _td(it.description),
                        _td(rupiah(it.price), align: TextAlign.center),
                        _td(_fmtQty(it.quantity), align: TextAlign.center),
                        _td(rupiah(it.total), align: TextAlign.right),
                      ],
                    )),
              ],
            ),
          ),
          const SizedBox(height: 12),
          // Ringkasan
          _summaryRow('Subtotal', rupiah(data.subtotal)),
          if (data.tipAmount > 0)
            _summaryRow('Tip', rupiah(data.tipAmount)),
          _summaryRow('Total', rupiah(data.grandTotal)),
          const SizedBox(height: 8),
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
            decoration: BoxDecoration(
              color: const Color(0xFFF2F2F2),
              borderRadius: BorderRadius.circular(8),
            ),
            child: Row(
              children: [
                const Expanded(
                  child: Text('Jumlah yang Harus Dibayar',
                      style: TextStyle(
                          fontWeight: FontWeight.w700,
                          fontSize: 13,
                          color: Colors.black)),
                ),
                const SizedBox(width: 8),
                Text(rupiah(data.grandTotal),
                    style: const TextStyle(fontWeight: FontWeight.w700, fontSize: 13, color: Colors.black)),
              ],
            ),
          ),
          if (data.qrisImage != null || data.qrisBytes != null) ...[
            const SizedBox(height: 16),
            const Text('Pembayaran via QRIS',
                style: TextStyle(
                    fontWeight: FontWeight.w700,
                    fontSize: 13,
                    color: Colors.black)),
            const SizedBox(height: 8),
            Center(
              child: Container(
                padding: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.black12),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: data.qrisImage != null
                    ? RawImage(
                        image: data.qrisImage,
                        width: 180,
                        height: 180,
                        fit: BoxFit.contain,
                      )
                    : Image.memory(
                        data.qrisBytes!,
                        width: 180,
                        height: 180,
                        fit: BoxFit.contain,
                        errorBuilder: (_, __, ___) => const SizedBox.shrink(),
                      ),
              ),
            ),
          ],
          const SizedBox(height: 16),
          const Divider(),
          const SizedBox(height: 8),
          if (data.thankYouText.isNotEmpty)
            Text(
              data.thankYouText,
              style: const TextStyle(
                  fontSize: 12,
                  fontWeight: FontWeight.w700,
                  color: Colors.black),
              textAlign: TextAlign.center,
            ),
          if (data.pantunText.isNotEmpty) ...[
            const SizedBox(height: 4),
            ..._pantunLines(data.pantunText),
          ],
          if (data.disclaimer.isNotEmpty) ...[
            const SizedBox(height: 8),
            Text(
              data.disclaimer,
              style: const TextStyle(fontSize: 10, color: Colors.black54),
              textAlign: TextAlign.center,
            ),
          ],
          if (data.storeName.isNotEmpty) ...[
            const SizedBox(height: 4),
            Text(data.storeName,
                style: const TextStyle(fontSize: 10, color: Colors.black54),
                textAlign: TextAlign.center),
          ],
        ],
      ),
    );
  }

  Widget _logoFallback(String name) {
    return Container(
      width: 72,
      height: 72,
      decoration: BoxDecoration(
        color: const Color(0xFFF2F2F2),
        borderRadius: BorderRadius.circular(12),
      ),
      alignment: Alignment.center,
        child: Text(name.isNotEmpty ? name[0].toUpperCase() : 'T',
            style: const TextStyle(fontSize: 28, fontWeight: FontWeight.bold, color: Colors.black)),
    );
  }

  Widget _storeHeader(InvoiceData data) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisSize: MainAxisSize.min,
      children: [
        Text(data.storeName,
            style: const TextStyle(
                fontSize: 14,
                fontWeight: FontWeight.w700,
                color: Colors.black)),
        if (data.storeAddress.isNotEmpty) ...[
          const SizedBox(height: 2),
          Text(data.storeAddress,
              style: const TextStyle(fontSize: 10, color: Colors.black87)),
        ],
        if (data.adminPhone.isNotEmpty) ...[
          const SizedBox(height: 2),
          Text('Telp: ${data.adminPhone}',
              style: const TextStyle(fontSize: 10, color: Colors.black87)),
        ],
        if (data.adminName.isNotEmpty) ...[
          const SizedBox(height: 2),
          Text('Admin: ${data.adminName}',
              style: const TextStyle(fontSize: 10, color: Colors.black87)),
        ],
      ],
    );
  }

  static List<Widget> _pantunLines(String text) {
    return text
        .split(RegExp(r'\\n|\n'))
        .map((line) => line.trim())
        .where((line) => line.isNotEmpty)
        .map((line) => Text(
              line,
              style: const TextStyle(fontSize: 10, color: Colors.black87),
              textAlign: TextAlign.center,
            ))
        .toList();
  }

  static Widget _infoRow(String label, String value) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        SizedBox(
          width: 120,
          child: Text(label,
              style: const TextStyle(
                  fontSize: 11, fontWeight: FontWeight.w700, color: Colors.black54)),
        ),
        Expanded(
          child: Text(value, style: const TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: Colors.black)),
        ),
      ],
    );
  }

  static Widget _th(String t, {TextAlign align = TextAlign.left}) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Text(t,
          textAlign: align,
          style: const TextStyle(fontSize: 11, fontWeight: FontWeight.w700, color: Colors.black54)),
    );
  }

  static Widget _td(String t, {TextAlign align = TextAlign.left}) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Text(t, textAlign: align, style: const TextStyle(fontSize: 12, color: Colors.black)),
    );
  }

  static Widget _summaryRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 2),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(label, style: const TextStyle(fontSize: 12, color: Colors.black)),
          Text(value, style: const TextStyle(fontSize: 12, color: Colors.black)),
        ],
      ),
    );
  }

  static String _fmtQty(double q) {
    if (q == q.truncateToDouble()) return q.toInt().toString();
    return q.toStringAsFixed(2);
  }
}