import 'dart:typed_data';

import 'package:sysfarma_mobile/src/core/network/api_client.dart';
import 'package:flutter/material.dart';
import 'package:printing/printing.dart';
import 'package:url_launcher/url_launcher.dart';

class PdfHelper {
  /// Open an unauthenticated PDF in the system browser.
  static Future<bool> openPdf(String url) async {
    // ignore: avoid_print
    print('[EnterFarma] PdfHelper.openPdf url=$url');
    final uri = Uri.tryParse(url);
    if (uri == null) return false;
    try {
      return await launchUrl(uri, mode: LaunchMode.externalApplication);
    } catch (e) {
      // ignore: avoid_print
      print('[EnterFarma] PdfHelper.openPdf EXCEPTION: $e');
      return false;
    }
  }

  /// Download an authenticated PDF (sending the session token) and show it
  /// using the native printing viewer (which supports share + print).
  static Future<bool> openAuthenticatedPdf({
    required BuildContext context,
    required ApiClient apiClient,
    required String url,
    required String title,
  }) async {
    // ignore: avoid_print
    print('[EnterFarma] openAuthenticatedPdf url=$url');
    final messenger = ScaffoldMessenger.maybeOf(context);
    messenger?.showSnackBar(
      SnackBar(content: Text('Descargando $title...'), duration: const Duration(seconds: 2)),
    );

    final bytes = await apiClient.downloadAuthenticatedFile(url);
    if (bytes == null || bytes.isEmpty) {
      messenger?.showSnackBar(
        SnackBar(
          content: Text('No se pudo descargar $title'),
          backgroundColor: Colors.red,
        ),
      );
      return false;
    }

    final data = Uint8List.fromList(bytes);
    try {
      await Printing.layoutPdf(
        name: title,
        onLayout: (format) async => data,
      );
      return true;
    } catch (e) {
      // ignore: avoid_print
      print('[EnterFarma] openAuthenticatedPdf Printing EXCEPTION: $e');
      // Fallback: open share sheet with the bytes
      try {
        await Printing.sharePdf(bytes: data, filename: '$title.pdf');
        return true;
      } catch (e2) {
        // ignore: avoid_print
        print('[EnterFarma] openAuthenticatedPdf sharePdf EXCEPTION: $e2');
        messenger?.showSnackBar(
          SnackBar(
            content: Text('No se pudo abrir el PDF: $e'),
            backgroundColor: Colors.red,
          ),
        );
        return false;
      }
    }
  }
}