TimeSeriesC19

TimeSeriesC19.dart

/// TimeSeriesC19.dart
/// C19app1Pj\jchart_c19\lib\c19_data.dart
///   [gist](https://gist.github.com/JoeCodeswell/cdff0e68ae266fa624eaac5c286f20b2)
/// https://dartpad.dev/cdff0e68ae266fa624eaac5c286f20b2
/// 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)
///
///

import 'dart:convert';
import 'dart:async';
import 'dart:html';

void main() async {
// https://joecodeswell.com/cov19cty/default/selj/from-to-countyFIPS/2020-08-01/2020-08-08/6067/cases
  String w2p_cases_json_str =
      '''{"countyFIPS": 6067, "valList": [{"ConfirmedCases": 10016, "DateStr": "2020-08-01"}, {"ConfirmedCases": 10067, "DateStr": "2020-08-02"}, {"ConfirmedCases": 10122, "DateStr": "2020-08-03"}, {"ConfirmedCases": 10174, "DateStr": "2020-08-04"}, {"ConfirmedCases": 10244, "DateStr": "2020-08-05"}, {"ConfirmedCases": 10544, "DateStr": "2020-08-06"}, {"ConfirmedCases": 10795, "DateStr": "2020-08-07"}, {"ConfirmedCases": 10795, "DateStr": "2020-08-08"}], "state": "CA", "county": "Sacramento County", "countyPop": "1552058", "thruDate": "2020-08-08", "fromDate": "2020-08-01", "fieldName": "cases"}''';
  String w2p_json_str = '''{
    "fieldName":"deaths",
    "countyFIPS": 6067,
    "county": "Sacramento County",
    "countyPop": "2470546",
    "state": "CA",
    "fromDate": "2020-08-01",
    "thruDate": "2020-08-08",
    "valList": [
      {"DateStr":"2020-08-01", "Deaths": 15},
      {"DateStr":"2020-08-02", "Deaths": 16},
      {"DateStr":"2020-08-03", "Deaths": 17},
      {"DateStr":"2020-08-04", "Deaths": 18},
      {"DateStr":"2020-08-05", "Deaths": 19},
      {"DateStr":"2020-08-06", "Deaths": 20},
      {"DateStr":"2020-08-07", "Deaths": 20},
      {"DateStr":"2020-08-08", "Deaths": 20}
    ]
  }''';
  String json_str = '''{
    "type":"deaths",
    "countyFIPS": 6067,
    "county": "Sacramento County",
    "countyPop": "2470546",
    "state": "CA",
    "fromDate": "2020-08-01",
    "thruDate": "2020-08-08",
    "valList": [
      {"time":"2020-08-01", "value": 15},
      {"time":"2020-08-02", "value": 16},
      {"time":"2020-08-03", "value": 17},
      {"time":"2020-08-04", "value": 18},
      {"time":"2020-08-05", "value": 19},
      {"time":"2020-08-06", "value": 20},
      {"time":"2020-08-07", "value": 20},
      {"time":"2020-08-08", "value": 20}
    ]
  }''';
  var jsonObj = jsonDecode(json_str);

  print('jsonObj.runtimeType():  $jsonObj.runtimeType()');

  print('\n${jsonObj["type"]}');
  print('\n${jsonObj["county"]}');

// for (var ix in [0,1,2,3,4,5,6,7]){
//   print('${jsonObj["valList"][ix]}');
// }
  List<TimeSeriesC19> result = [];
  for (var itm in jsonObj["valList"]) {
    DateTime dt = DateTime.parse(itm["time"]);
    print('$dt');
//   int theVal = int.parse(itm["value"]);
    int theVal = itm["value"];
    print('$dt $theVal');
    result.add(new TimeSeriesC19(dt, theVal));
  }

  print('\nresult[0].time: ${result[0].time}');
  print('\nresult[0]: ${result[0]}');
  print('\nresult[0].time: ${result[0].time}');
  print('\nresult[0].value: ${result[0].value}');

// https://stackoverflow.com/a/45189401/601770
  var sacDeaths = new C19dataSet.fromJson(jsonDecode(w2p_json_str));
  print('\n\nsacDeaths.county: ${sacDeaths.county}');
  print('sacDeaths.valList[2].time: ${sacDeaths.valList[2].time}');
  print('sacDeaths.valList[2].value: ${sacDeaths.valList[2].value}');

var sacCases = new C19dataSet.fromJson(jsonDecode(w2p_cases_json_str));
print('\n\nsacCases.county: ${sacCases.county}');
print('sacCases.valList[2].time: ${sacCases.valList[2].time}');
print('sacCases.valList[2].value: ${sacCases.valList[2].value}');
  
  
  
  // // works OUT OF sequence when main is NOT delcared `async`
  // Future<String> reqJsonStr =  makeRequest();  
  // print('reqJsonStr: $reqJsonStr');
  
  // works IN sequence when main IS delcared `async`
  String reqJsonStr =  await makeRequest();  
  print('reqJsonStr: $reqJsonStr');
  
  print('\nSUCCESS 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

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

// Future<void> makeRequestOrig(Event _) async {
//   const path = 'https://dart.dev/f/portmanteaux.json';
//   try {
//     // Make the GET request
//     final jsonString = await HttpRequest.getString(path);
//     // The request succeeded. Process the JSON.
//     processResponse(jsonString);
//   } catch (e) {
//     // The GET request failed. Handle the error.
//     print('Couldn\'t open $path');
//     wordList.children.add(LIElement()..text = 'Request failed.');
//   }
// }
// void processResponseOrig(String jsonString) {
//   for (final portmanteau in json.decode(jsonString)) {
//     wordList.children.add(LIElement()..text = portmanteau);
//   }
// }


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,
  );
}

class C19dataSetOrig {
  final String type;
  final int countyFIPS;
  final String county;
  final String state;
  final String fromDate;
  final String thruDate;
  final List<TimeSeriesC19> valList;
  C19dataSetOrig(
    this.type,
    this.countyFIPS,
    this.county,
    this.state,
    this.fromDate,
    this.thruDate,
    this.valList,
  );
}

/* console out

jsonObj.runtimeType():  {type: deaths, countyFIPS: 6067, county: Sacramento County, countyPop: 2470546, state: CA, fromDate: 2020-08-01, thruDate: 2020-08-08, valList: [{time: 2020-08-01, value: 15}, {time: 2020-08-02, value: 16}, {time: 2020-08-03, value: 17}, {time: 2020-08-04, value: 18}, {time: 2020-08-05, value: 19}, {time: 2020-08-06, value: 20}, {time: 2020-08-07, value: 20}, {time: 2020-08-08, value: 20}]}.runtimeType()

deaths

Sacramento County
2020-08-01 00:00:00.000
2020-08-01 00:00:00.000 15
2020-08-02 00:00:00.000
2020-08-02 00:00:00.000 16
2020-08-03 00:00:00.000
2020-08-03 00:00:00.000 17
2020-08-04 00:00:00.000
2020-08-04 00:00:00.000 18
2020-08-05 00:00:00.000
2020-08-05 00:00:00.000 19
2020-08-06 00:00:00.000
2020-08-06 00:00:00.000 20
2020-08-07 00:00:00.000
2020-08-07 00:00:00.000 20
2020-08-08 00:00:00.000
2020-08-08 00:00:00.000 20

result[0].time: 2020-08-01 00:00:00.000

result[0]: Instance of 'TimeSeriesC19'

result[0].time: 2020-08-01 00:00:00.000

result[0].value: 15


sacDeaths.county: Sacramento County
sacDeaths.valList[2].time: 2020-08-03 00:00:00.000
sacDeaths.valList[2].value: 17


sacCases.county: Sacramento County
sacCases.valList[2].time: 2020-08-03 00:00:00.000
sacCases.valList[2].value: 10122
jsonString: [
  "portmanteau", "fantabulous", "spork", "smog",
  "spanglish", "gerrymander", "turducken", "stagflation",
  "bromance", "freeware", "oxbridge", "palimony", "netiquette",
  "brunch", "blog", "chortle", "Hassenpfeffer", "Schnitzelbank"
]

reqJsonStr: [
  "portmanteau", "fantabulous", "spork", "smog",
  "spanglish", "gerrymander", "turducken", "stagflation",
  "bromance", "freeware", "oxbridge", "palimony", "netiquette",
  "brunch", "blog", "chortle", "Hassenpfeffer", "Schnitzelbank"
]


SUCCESS Thanks, Holy Trinity.
This ran to the end as of: 2020-10-07 07:30:49.544! 
 Yahoo! 
 Yahoo!
 I rest in Your Peace that passes understanding.
 
*/