rog_app/lib/services/location_service.dart

import 'dart:convert';

import 'package:geojson/geojson.dart';
import 'package:http/http.dart' as http;
import 'package:rogapp/utils/const.dart';

class LocationService{

   static Future<GeoJsonFeatureCollection?> loadLocations() async {
     String server_url = ConstValues.currentServer();
    String url = '${server_url}/api/location/';
    //String url = 'http://localhost:8100/api/location/';
    final response = await http.get(Uri.parse(url),
      headers: <String, String>{
        'Content-Type': 'application/json; charset=UTF-8',
      },
    );

    if (response.statusCode == 200) {

    return featuresFromGeoJson(utf8.decode(response.bodyBytes));
    }
    return null;
  }

  static Future<GeoJsonFeatureCollection?> loadLocationsFor(String perfecture, String cat) async {
    String url = "";
    String server_url = ConstValues.currentServer();
    if(cat.isNotEmpty){
      url = '${server_url}/api/inperf/?perf=' + perfecture + '&cat=' + cat;
      //url = 'http://localhost:8100/api/inperf/?perf=' + perfecture + '&cat=' + cat;
    }
    else{
      url = '${server_url}/api/inperf/?perf=' + perfecture;
      //url = 'http://localhost:8100/api/inperf/?perf=' + perfecture;
    }
    //print("----- url ---- ${url} --- ${cat}");
    //String url = 'http://localhost:8100/api/inperf/?perf=' + perfecture + '&cat=' + cat;
    final response = await http.get(Uri.parse(url),
      headers: <String, String>{
        'Content-Type': 'application/json; charset=UTF-8',
      },
    );

    if (response.statusCode == 200) {
      GeoJsonFeatureCollection cc =  await featuresFromGeoJson(utf8.decode(response.bodyBytes));
      //print(cc);
      return cc; //featuresFromGeoJson(utf8.decode(response.bodyBytes));
    }
    return null;
  }


  static Future<GeoJsonFeatureCollection?> loadLocationsSubFor(String subperfecture, String cat) async {
    String url = "";
    String server_url = ConstValues.currentServer();
    if(cat.isNotEmpty){
      url = '${server_url}/api/insubperf?subperf=' + subperfecture + '&cat=' + cat;
      //url = 'http://localhost:8100/api/insubperf?subperf=' + subperfecture + '&cat=' + cat;
    }
    else{
      print("------ loading location in sub----");
      url = '${server_url}/api/insubperf?subperf=' + subperfecture;
      //url = 'http://localhost:8100/api/insubperf?subperf=' + subperfecture;
    }
    final response = await http.get(Uri.parse(url),
      headers: <String, String>{
        'Content-Type': 'application/json; charset=UTF-8',
      },
    );

    if (response.statusCode == 200) {
      GeoJsonFeatureCollection cc =  await featuresFromGeoJson(utf8.decode(response.bodyBytes));
      //print(cc);
      return cc; //featuresFromGeoJson(utf8.decode(response.bodyBytes));
    }
    return null;
  }


    static Future<GeoJsonFeatureCollection?> loadLocationsBound(double lat1, double lon1, double lat2, double lon2, double lat3, double lon3, double lat4, double lon4, String cat) async {
    String url = "";
    String server_url = ConstValues.currentServer();
    print("cat is ----- ${cat}");
    if(cat.isNotEmpty){
      url = '${server_url}/api/inbound?ln1=${lon1}&la1=${lat1}&ln2=${lon2}&la2=${lat2}&ln3=${lon3}&la3=${lat3}&ln4=${lon4}&la4=${lat4}' + '&cat=' + cat;
      //url = 'http://localhost:8100/api/inbound?ln1=${lon1}&la1=${lat1}&ln2=${lon2}&la2=${lat2}&ln3=${lon3}&la3=${lat3}&ln4=${lon4}&la4=${lat4}' + '&cat=' + cat;
    }
    else{
      url = '${server_url}/api/inbound?ln1=${lon1}&la1=${lat1}&ln2=${lon2}&la2=${lat2}&ln3=${lon3}&la3=${lat3}&ln4=${lon4}&la4=${lat4}';
      //url = 'http://localhost:8100/api/inbound?ln1=${lon1}&la1=${lat1}&ln2=${lon2}&la2=${lat2}&ln3=${lon3}&la3=${lat3}&ln4=${lon4}&la4=${lat4}';
    }
    print("----url --- ${url}");
    final response = await http.get(Uri.parse(url),
      headers: <String, String>{
        'Content-Type': 'application/json; charset=UTF-8',
      },
    );

    if (response.statusCode == 500) {
      return GeoJsonFeatureCollection(); //featuresFromGeoJson(utf8.decode(response.bodyBytes));
    }

    if (response.statusCode == 200) {
      GeoJsonFeatureCollection cc =  await featuresFromGeoJson(utf8.decode(response.bodyBytes));
      if(cc.collection.isEmpty){
        return null;
      }
      else{
        return cc; 
      }
    }
    return null;
  }


  static Future<GeoJsonFeatureCollection?> loadCustomLocations(String name, String cat) async {
    String url = "";
    String server_url = ConstValues.currentServer();
    print("cat is ----- ${cat}");
    if(cat.isNotEmpty){
      url = '${server_url}/api/custom_area/?&cat=' + cat;
      //url = 'http://localhost:8100/api/customarea?name=${name}&cat=' + cat;
    }
    else{
      url = '${server_url}/api/customarea?name=${name}&';
      //url = 'http://localhost:8100/api/customarea?name=${name}&';
    }
    print("----url --- ${url}");
    final response = await http.get(Uri.parse(url),
      headers: <String, String>{
        'Content-Type': 'application/json; charset=UTF-8',
      },
    );

    if (response.statusCode == 500) {
      return GeoJsonFeatureCollection(); //featuresFromGeoJson(utf8.decode(response.bodyBytes));
    }

    if (response.statusCode == 200) {
      GeoJsonFeatureCollection cc =  await featuresFromGeoJson(utf8.decode(response.bodyBytes));
      if(cc.collection.isEmpty){
        return null;
      }
      else{
        return cc; 
      }
    }
    return null;
  }




}