meshcore-client/lib/utils/gpx_export.dart

import 'package:flutter/foundation.dart';
import 'package:gpx/gpx.dart';
import 'package:meshcore_open/connector/meshcore_connector.dart';
import 'package:meshcore_open/connector/meshcore_protocol.dart';
import 'package:path_provider/path_provider.dart';
import 'dart:io';

import 'package:share_plus/share_plus.dart';

class ContactExport {
  final String name;
  final double lat;
  final double lon;
  final String desc;
  final double? ele;

  ContactExport({
    required this.name,
    required this.lat,
    required this.lon,
    required this.desc,
    this.ele,
  });
}

const int GpxExportFailed = -1;
const int GpxExportSuccess = 1;
const int GpxExportNoContacts = 2;
const int GpxExportCancelled = 3;
const int GpxExportNotAvailable = 4;

class GpxExport {
  MeshCoreConnector _connector;
  List<ContactExport> _contacts = [];

  GpxExport(this._connector);

  void _addContact(String name, double lat, double lon, String desc, [double? ele]) {
    _contacts.add(ContactExport(
      name: name.trim(),
      lat: lat,
      lon: lon,
      desc: desc.trim(),
      ele: ele,
    ));
  }

  void addRepeaters() {
    final contacts = _connector.contacts;
    final repeaters = contacts.where((c) => c.type == advTypeRepeater || c.type == advTypeRoom).toList();
    for (var repeater in repeaters) {
      if (repeater.latitude == null || repeater.longitude == null) {
        continue;
      }
      _addContact(
        repeater.name,
        repeater.latitude ?? 0.0,
        repeater.longitude ?? 0.0,
        "Type: ${repeater.typeLabel}\nPublic Key: ${repeater.publicKeyHex}",
      );
    }
  }

  void addContacts() {
    final contacts = _connector.contacts;
    final repeaters = contacts.where((c) => c.type == advTypeChat).toList();
    for (var repeater in repeaters) {
      if (repeater.latitude == null || repeater.longitude == null) {
        continue;
      }
      _addContact(
        repeater.name,
        repeater.latitude ?? 0.0,
        repeater.longitude ?? 0.0,
        "Type: ${repeater.typeLabel}\nPublic Key: ${repeater.publicKeyHex}",
      );
    }
  }

  void addAll() {
    final contacts = _connector.contacts;
     for (var repeater in contacts.toList()) {
      if (repeater.latitude == null || repeater.longitude == null) {
        continue;
      }
      _addContact(
        repeater.name,
        repeater.latitude ?? 0.0,
        repeater.longitude ?? 0.0,
        "Type: ${repeater.typeLabel}\nPublic Key: ${repeater.publicKeyHex}",
      );
    }
  }

  Future<int> exportGPX() async {
    if (_contacts.isEmpty) {
      debugPrint("No repeaters to export – nothing to share.");
      return GpxExportNoContacts;
    }

    try {
      // 1. Build GPX content (your existing logic – unchanged here)
      final gpx = Gpx()
        ..version = '1.1'
        ..creator = 'meshcore-open Repeater Exporter'
        ..metadata = Metadata(
            name: 'Meshcore Repeaters',
            desc: 'Repeater & room locations exported from meshcore-open',
            time: DateTime.now().toUtc(),
          );

      gpx.wpts = _contacts.map((c) => Wpt(
            lat: c.lat,
            lon: c.lon,
            ele: c.ele,
            name: c.name,
            desc: c.desc,
          )).toList();

      final xml = GpxWriter().asString(gpx, pretty: true);

      // 2. Save to file
      final dir = await getApplicationDocumentsDirectory();
      final timestamp = DateTime.now().toUtc().toIso8601String()
          .replaceAll(':', '-')
          .replaceAll('.', '-')
          .split('T')
          .join('_');
      final path = '${dir.path}/meshcore_repeaters_$timestamp.gpx';

      final file = File(path);
      await file.writeAsString(xml);

      // 3. Modern share call (2025+ style)
      final result = await SharePlus.instance.share(
        ShareParams(
          text: 'Repeater locations exported from meshcore-open app as GPX file.',
          subject: 'Meshcore Repeaters GPX Export',
          files: [XFile(path)],
          // Optional: sharePositionOrigin: ... (if you want iPad popover positioning)
        ),
      );

      // 4. Handle result
      switch (result.status) {
        case ShareResultStatus.success:
          debugPrint('Share successful – user completed the action.');
          return GpxExportSuccess;
        case ShareResultStatus.dismissed:
          debugPrint('Share sheet was dismissed / cancelled by user.');
          return GpxExportCancelled;
        case ShareResultStatus.unavailable:
          debugPrint('Sharing is not available on this platform / context.');
          return GpxExportNotAvailable;
      }

      // Optional cleanup (uncomment if you don't want to keep the file)
      // await file.delete();
    } catch (e, stack) {
      debugPrint('Export or share failed: $e\n$stack');
      // → here you could show a SnackBar / AlertDialog in real UI code
    }
    return GpxExportFailed;
  }
}