import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:flutter/services.dart';
import 'config.dart';

class ShareDialog extends StatefulWidget {
  final int fileId;
  final String fileName;

  const ShareDialog({
    required this.fileId,
    required this.fileName,
    super.key,
  });

  @override
  State<ShareDialog> createState() => _ShareDialogState();
}

class _ShareDialogState extends State<ShareDialog> {
  bool _isPublicShare = true;
  int _expirationDays = 7;
  bool _isLoading = false;
  String? shareLink;
  String? _error;

  Future<void> _createShare() async {
    setState(() {
      _isLoading = true;
      _error = null;
    });

    try {
      final prefs = await SharedPreferences.getInstance();
      final jwt = prefs.getString('jwt');

      if (jwt == null) {
        setState(() {
          _error = 'Sessione scaduta, effettua di nuovo il login.';
          _isLoading = false;
        });
        return;
      }

      final uri = Uri.parse('${Config.apiUrl}/share');
      final response = await http.post(
        uri,
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer $jwt',
        },
        body: jsonEncode({
          'file_id': widget.fileId,
          'expires_in_days': _isPublicShare ? _expirationDays : null,
        }),
      );

      if (response.statusCode == 200) {
        final shareId = jsonDecode(response.body);
        setState(() {
          shareLink = '${Config.apiUrl}/shared/$shareId';
          _isLoading = false;
        });
      } else {
        setState(() {
          _error = 'Errore durante la creazione del link di condivisione.';
          _isLoading = false;
        });
      }
    } catch (e) {
      setState(() {
        _error = 'Errore di rete: ${e.toString()}';
        _isLoading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text('Condividi "${widget.fileName}"'),
      content: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            SwitchListTile(
              title: const Text('Link pubblico'),
              subtitle: const Text('Chiunque con il link può accedere al file'),
              value: _isPublicShare,
              onChanged: (value) {
                setState(() {
                  _isPublicShare = value;
                });
              },
            ),
            if (_isPublicShare) ...[
              const SizedBox(height: 16),
              const Text('Scadenza del link:'),
              Slider(
                value: _expirationDays.toDouble(),
                min: 1,
                max: 30,
                divisions: 29,
                label: _expirationDays.toString(),
                onChanged: (value) {
                  setState(() {
                    _expirationDays = value.round();
                  });
                },
              ),
              Text('Il link scadrà dopo $_expirationDays giorni'),
            ],
            if (shareLink != null) ...[
              const SizedBox(height: 16),
              const Text('Link di condivisione:'),
              const SizedBox(height: 8),
              Container(
                padding: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  color: Colors.grey[200],
                  borderRadius: BorderRadius.circular(4),
                ),
                child: Row(
                  children: [
                    Expanded(
                      child: Text(
                        shareLink!,
                        style: const TextStyle(fontFamily: 'monospace'),
                      ),
                    ),
                    IconButton(
                      icon: const Icon(Icons.copy),
                      tooltip: 'Copia link',
                      onPressed: () {
                        Clipboard.setData(ClipboardData(text: shareLink ?? ''));
                        ScaffoldMessenger.of(context).showSnackBar(
                          const SnackBar(
                              content: Text('Link copiato negli appunti')),
                        );
                      },
                    ),
                  ],
                ),
              ),
            ],
            if (_error != null) ...[
              const SizedBox(height: 16),
              Text(
                _error!,
                style: TextStyle(color: Theme.of(context).colorScheme.error),
              ),
            ],
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(context).pop(),
          child: const Text('Chiudi'),
        ),
        if (shareLink == null)
          ElevatedButton(
            onPressed: _isLoading ? null : _createShare,
            child: _isLoading
                ? const SizedBox(
                    width: 20,
                    height: 20,
                    child: CircularProgressIndicator(strokeWidth: 2),
                  )
                : const Text('Crea link'),
          ),
      ],
    );
  }
}