import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:open_file/open_file.dart';

import 'package:cashumit/services/invoice_image_service.dart';
import 'package:cashumit/services/media_store_service.dart';

/// Dialog preview gambar invoice. Tidak menyimpan file otomatis;
/// user menekan "Simpan" untuk menulis ke folder Download.
class InvoicePreviewDialog extends StatefulWidget {
  final Uint8List bytes;
  final String invoiceNumber;

  const InvoicePreviewDialog({
    super.key,
    required this.bytes,
    required this.invoiceNumber,
  });

  @override
  State<InvoicePreviewDialog> createState() => _InvoicePreviewDialogState();
}

class _InvoicePreviewDialogState extends State<InvoicePreviewDialog> {
  bool _saving = false;
  InvoiceSaveResult? _saved;

  Future<void> _save() async {
    if (_saving) return;
    setState(() => _saving = true);
    final saved = await InvoiceImageService.saveBytes(
      bytes: widget.bytes,
      invoiceNumber: widget.invoiceNumber,
      alsoSaveToDownloads: true,
    );
    if (!mounted) return;
    setState(() {
      _saving = false;
      _saved = saved;
    });
    if (saved.downloadsDisplayPath != null) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
            content: Text(
                'Invoice tersimpan di ${saved.downloadsDisplayPath}')),
      );
    } else if (saved.localPath != null) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Invoice tersimpan: ${saved.localPath}')),
      );
    } else {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Gagal menyimpan invoice')),
      );
    }
  }

  Future<void> _openSaved() async {
    final saved = _saved;
    if (saved == null) return;
    if (saved.downloadsUri != null) {
      await MediaStoreService.openFile(uri: saved.downloadsUri);
    } else if (saved.localPath != null) {
      await OpenFile.open(saved.localPath!);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Dialog(
      insetPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 24),
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxWidth: 460, maxHeight: 700),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Padding(
              padding: const EdgeInsets.fromLTRB(16, 12, 8, 8),
              child: Row(
                children: [
                  Expanded(
                    child: Text(
                      'Invoice ${widget.invoiceNumber}',
                      style: const TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ),
                  IconButton(
                    icon: const Icon(Icons.close),
                    onPressed: () => Navigator.of(context).pop(),
                  ),
                ],
              ),
            ),
            const Divider(height: 1),
            Expanded(
              child: InteractiveViewer(
                minScale: 0.5,
                maxScale: 4.0,
                child: Center(
                  child: Image.memory(
                    widget.bytes,
                    fit: BoxFit.contain,
                  ),
                ),
              ),
            ),
            const Divider(height: 1),
            Padding(
              padding: const EdgeInsets.all(12),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: [
                  if (_saved != null)
                    TextButton.icon(
                      onPressed: _openSaved,
                      icon: const Icon(Icons.open_in_new, size: 18),
                      label: const Text('Buka File'),
                    ),
                  const SizedBox(width: 8),
                  ElevatedButton.icon(
                    onPressed: _saving ? null : _save,
                    icon: _saving
                        ? const SizedBox(
                            width: 16,
                            height: 16,
                            child: CircularProgressIndicator(
                              strokeWidth: 2,
                              color: Colors.white,
                            ),
                          )
                        : const Icon(Icons.save_alt, size: 18),
                    label: Text(_saving ? 'Menyimpan...' : 'Simpan'),
                  ),
                  const SizedBox(width: 8),
                  TextButton(
                    onPressed: () => Navigator.of(context).pop(),
                    child: const Text('Tutup'),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}