mobile-flutter/covas_mobile/lib/pages/SearchDelegate.dart

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'dart:io';
import 'ItemMenu.dart';
import '../classes/events.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart'; // Import dotenv
import 'dart:math';

import '../variable/globals.dart' as globals;

class SearchDelegateExample extends SearchDelegate {
  final String geoQuery;

  SearchDelegateExample({
    required this.geoQuery,
  });

  @override
  List<Widget> buildActions(BuildContext context) {
    return [
      IconButton(
        icon: const Icon(Icons.clear),
        onPressed: () {
          query = '';
        },
      ),
    ];
  }

  @override
  Widget buildLeading(BuildContext context) {
    return IconButton(
      icon: const Icon(Icons.arrow_back),
      onPressed: () {
        close(context, null);
      },
    );
  }

  @override
  Widget buildResults(BuildContext context) {
    // Perform the search and return the results
    return FutureBuilder<List<Events>>(
      future: searchPosts(query, geoQuery),
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Center(child: CircularProgressIndicator());
        } else if (snapshot.hasData) {
          final posts = snapshot.data!;
          return ListView.builder(
            itemCount: posts.length,
            itemBuilder: (context, index) {
              final post = posts[index];
              return ListTile(
                title: Text(post.name!),
                subtitle: Text(post.place!),
                onTap: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (_) => ItemMenu(title: post.id!),
                    ),
                  );
                },
              );
            },
          );
        } else {
          return const Center(child: Text("No results found"));
        }
      },
    );
  }

  @override
  Widget buildSuggestions(BuildContext context) {
    return Container(); // Implement suggestions if needed
  }

  Future<List<Events>> searchPosts(String query, String geoQuery) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    var accessToken = prefs.getString("access_token") ?? "";
    final List<Events> body = [];
    if (accessToken.isNotEmpty) {
      DateTime currentDate = new DateTime.now();
      var url = Uri.parse(
          "${globals.api}/events/search?item=${query}&current_dateime=${currentDate.toString()}");
      if (geoQuery.isNotEmpty) {
        await dotenv.load(
            fileName: ".env"); // Load your .env for the Mapbox access token
        final mapboxAccessToken = dotenv.env['MAPBOX_ACCESS_TOKEN'] ?? '';
        final geocodeUrl = Uri.parse(
            'https://api.mapbox.com/geocoding/v5/mapbox.places/$geoQuery.json?access_token=$mapboxAccessToken');
        final geocodeResponse = await http.get(geocodeUrl);
        if (geocodeResponse.statusCode == 200) {
          final geocodeData = json.decode(geocodeResponse.body);
          if (geocodeData['features'].isNotEmpty) {
            final coordinates =
                geocodeData['features'][0]['geometry']['coordinates'];
            final longitude = coordinates[0]; // Longitude
            final latitude = coordinates[1]; // Latitude

            // Now use the latitude and longitude to get events within a 50km radius
            double radiusInKm = 50;
            double latDistance = radiusInKm / 111.0;
            double lonDistance =
                radiusInKm / (111.0 * cos(latitude * pi / 180));

            double minLat = latitude - latDistance;
            double maxLat = latitude + latDistance;
            double minLon = longitude - lonDistance;
            double maxLon = longitude + lonDistance;

            // Construct the search URL with the item query and latitude/longitude bounds
            url = Uri.parse(
                "${globals.api}/events/search?item=${query}&min_lat=${minLat}&max_lat=${maxLat}&min_lon=${minLon}&max_lon=${maxLon}&current_dateime=${currentDate.toString()}");
          }
        }
      }
      final response = await http.get(url, headers: {
        "Content-Type": "application/json",
        HttpHeaders.cookieHeader: "access_token=${accessToken}"
      });
      final List body = json.decode(utf8.decode(response.bodyBytes));
      return body.map((e) => Events.fromJson(e)).toList();
    }
    return body;
  }
}