C19data.dart

C19data.dart

/// C19data.dart
///   [gist](https://gist.github.com/JoeCodeswell/2f492c65c15a299f3176b06b0d178d5c)
///   [Dartpad](https://dartpad.dev/2f492c65c15a299f3176b06b0d178d5c)
/// Predecessor TimeSeriesC19.dart
///   C19app1Pj\jchart_c19\lib\c19_data.dart
///     [gist](https://gist.github.com/JoeCodeswell/cdff0e68ae266fa624eaac5c286f20b2)
///    https://dartpad.dev/cdff0e68ae266fa624eaac5c286f20b2
/// 
/// Because of the limitations of DartPad, this has moved to  
/// jchart_c19\C19DataSets.dart
///   C:\1d\FlutterDartPjs\JoesDemoPjs\Covid19app_jcwPjs\C19app1Pj\jchart_c19\C19DataSets.dart
/// 
///    
/// Google: dart:html example
/// EXCELLENT: 
///   1. [[dart]Loading a web page's HTML to a string](https://stackoverflow.com/a/16937319/601770)
///    `import 'package:http/http.dart' as http; // no good`  
///   2. [Making a HTML request without dart:html](https://stackoverflow.com/a/20433342/601770)
///       "You have to use HttpClient from dart:io library." 
///   3. google: dart html client example
///     - [Quick tip: How to make HTTP requests (Dart)](https://dev.to/graphicbeacon/quick-tip-how-to-make-http-requests-dart-56dd)
///
///
/// See VERY HELPFUL ANSWERS IN [Mapping JSON into Class Objects](https://stackoverflow.com/a/45189401/601770)
/// [HTML - Using getString() to load a file](https://dart.dev/tutorials/web/fetch-data#using-getString-function)
/// google: dart await result
/// [Asynchronous programming: futures, async, await](https://dart.dev/codelabs/async-await)
/// 
/// [path2json cases example]('https://joecodeswell.com/cov19cty/default/selj/from-to-countyFIPS/2020-08-01/2020-08-08/6067/cases')
///
/// [html 0.14.0+4](https://pub.dev/packages/html)
/// 

// import 'dart:convert';
import 'dart:async';  // dartpad says:  info Unused import: 'dart:async' - line 31
// import 'dart:html';

// import 'dart:io'; // Dart issue: Platform in dart:io fails #1062 "dartpad can't use dart:io ... Only servers, command-line scripts, and Flutter mobile apps can import and use dart:io.""
import 'dart:convert';

// import 'package:http/http.dart' as http;  // dartpad >> NO GOOD see updates (https://github.com/dart-lang/dart-pad/issues/901)

void main() async {
  // [path2json cases example]('https://joecodeswell.com/cov19cty/default/selj/from-to-countyFIPS/2020-08-01/2020-08-08/6067/cases')

 

// String path2portmanteaux_json = 'https://dart.dev/f/portmanteaux.json'; 
// String respJsonStr =  await makeRequest(path2portmanteaux_json);  
// print('respJsonStr: $respJsonStr');

// String path2cov19cty_json = 'https://joecodeswell.com/cov19cty/default/selj/from-to-countyFIPS/2020-08-01/2020-08-08/6067/cases';
// respJsonStr =  await makeRequest(path2cov19cty_json);  
// print('respJsonStr: $respJsonStr');

  
// respJsonStr =  await makeRequest(path2cov19cty_json+'/.json');  
// print('respJsonStr: $respJsonStr');
 
// // from https://dev.to/graphicbeacon/quick-tip-how-to-make-http-requests-dart-56dd
// var request = await HttpClient().getUrl(Uri.parse('https://swapi.co/api/people/1')); // produces a request object
// var response = await request.close(); // sends the request
// // transforms and prints the response
// await for (var contents in response.transform(Utf8Decoder())) {
//   print(contents);
// } 
// // RESULT: Uncaught Error: Unsupported operation: Platform._version 
 
// // dart:io can't be used in dartpad
// // from https://api.dart.dev/stable/2.0.0/dart-io/HttpClient-class.html
// HttpClient client = new HttpClient();
// client.getUrl(Uri.parse('https://dart.dev/f/portmanteaux.json'))
//     .then((HttpClientRequest request) {
//       // Optionally set up headers...
//       // Optionally write to the request object...
//       // Then call close.
      
//       return request.close();
//     })
//     .then((HttpClientResponse response) {
//       print(response);
//     });
  
print('\nSUCCESSish! Thanks, Holy Trinity.\nThis ran to the end as of: ${DateTime.now()}! \n Yahoo! \n Yahoo!\n I rest in Your Peace that Passes Understanding.');
 
} // end main

class C19dataSet {
  /// see https://stackoverflow.com/a/45189401/601770
  ///   - properties can't be  final
  
  int countyFIPS;
  String state;
  String county;
  int countyPop;
  DateTime fromDate;
  DateTime thruDate;
  String fieldName;
  List<TimeSeriesC19> valList;

  C19dataSet.fromJson(Map json) {
    this.countyFIPS = json['countyFIPS'];
    this.state = json['state'];
    this.county = json['county'];
    this.countyPop = int.parse(json['countyPop']);
    this.fromDate = DateTime.parse(json['fromDate']);
    this.thruDate = DateTime.parse(json['thruDate']);
    this.fieldName = json['fieldName'];

    valList = [];
    for (var itm in json['valList']) {
      // print('DateStr: ${itm['DateStr']}');
      DateTime dt = DateTime.parse(itm['DateStr']);
      // print('dt: $dt');

      int theVal;
      // UNFORTUNATELY theVal fieldName VARIES in web2py can be 'ConfirmedCases' also 'Deaths'
      if (json['fieldName'] == 'deaths') {
        theVal = itm['Deaths'];
      } else if (json['fieldName'] == 'cases') {
        theVal = itm['ConfirmedCases'];
      } else {
        print("Houston...Problem >> json['fieldName']");
      }

      valList.add(new TimeSeriesC19(dt, theVal));
    }
  }
}

class TimeSeriesC19 {
  final DateTime time;
  final int value;

  TimeSeriesC19(
    this.time,
    this.value,
  );
}

// // Uses "Wrong" HttpRequest
// Future<String> makeRequest(String path2json) async {
// //   const path2json = 'https://dart.dev/f/portmanteaux.json';
//   String retString = '';
//   try {
//     // Make the GET request
//     final jsonString = await HttpRequest.getString(path2json); 
//     // The request succeeded. Process the JSON.
//     retString = processResponse(jsonString);
//   } catch (e) {
//     // The GET request failed. Handle the error.
//     print('Couldn\'t open $path2json');
//     //wordList.children.add(LIElement()..text = 'Request failed.');
//     retString = 'Request failed.';    
//   }
//   return retString;
// }
// String processResponse(String jsonString) {
//   // print('jsonString: $jsonString');
//   return jsonString;
// }

/*

SUCCESSish! Thanks, Holy Trinity.
This ran to the end as of: 2020-10-07 12:04:20.946! 
 Yahoo! 
 Yahoo!
 I rest in Your Peace that Passes Understanding.
 
*/