import 'dart:convert';
import 'package:fhir/r4.dart';
import 'package:flutter/material.dart';
import 'package:flutter_fhir_new/main.dart';
import 'package:http/http.dart' as http;

class Fhir extends StatelessWidget {
  const Fhir({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Fhir'),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          Center(
            child: ElevatedButton(
              onPressed: () async {
                //creo observation
                var observation = Observation(
                    resourceType: R4ResourceType.Observation,
                    status: ObservationStatus.final_,
                    /*category: [
                      CodeableConcept(coding: [
                        Coding(system: FhirUri('prova'), code: Code("prova"))
                      ], text: "prova")
                    ],*/
                    code: CodeableConcept(
                      coding: [Coding(
                        system: FhirUri('https://www.snomed.org/'),
                        code: Code('000000'),
                        display: "Walking Test")],
                    ),
                    subject: Reference(
                      reference: "Patient/2936332", //luca rossi
                    ),
                    effectiveDateTime:
                        FhirDateTime("2020-07-29T00:02:00+01:00"),
                    //se si vuole un performer bisogna creare la risorsa nel fhir server
                    /*performer: [
                      Reference(
                          reference:
                              "Practitioner/e1e35745-5403-4a83-904f-4401baa25e10",
                          display: "")
                    ],*/
                    bodySite: CodeableConcept(coding: [
                      Coding(display: 'Ankle'), //bodysite
                      Coding(display: 'Left') //side
                    ]),
                    //possibilità di inserire note
                    /*note: [
                      Annotation(
                          authorReference: Reference(
                              reference:
                                  "Practitioner/e1e35745-5403-4a83-904f-4401baa25e10",
                              display: "Prandin R."),
                          time: FhirDateTime("2020-07-29T00:02:00+01:00"),
                          text: Markdown('Prova'))
                    ],*/

                    component: [
                      ObservationComponent(
                          valueString: 'prova',
                          code: CodeableConcept(coding: [
                            Coding(
                                display: "Prova",
                                system: FhirUri("http://snomed.info/sct")),
                          ], text: "Prova"))
                    ]);

                var response = await http.post(Uri.parse('$server/Observation'),
                    headers: headers, body: jsonEncode(observation.toJson()));

                if (response.statusCode == 200 || response.statusCode == 201) {
                  Observation body =
                      Observation.fromJson(jsonDecode(response.body));

                  showDialog(
                    context: context,
                    builder: (ctx) => AlertDialog(
                      title: Text(
                          'Observation successfully sent!\nId: ${body.id}'),
                      content:
                          SingleChildScrollView(child: Text(response.body)),
                      actions: <Widget>[
                        TextButton(
                          onPressed: () {
                            Navigator.of(ctx).pop();
                          },
                          child: const Text("Ok"),
                        ),
                      ],
                    ),
                  );
                } else {
                  showDialog(
                    context: context,
                    builder: (ctx) => AlertDialog(
                      title: const Text('Error'),
                      content:
                          SingleChildScrollView(child: Text(response.body)),
                      actions: <Widget>[
                        TextButton(
                          onPressed: () {
                            Navigator.of(ctx).pop();
                          },
                          child: const Text("Ok"),
                        ),
                      ],
                    ),
                  );
                }
              },
              child: const Text('Create Observation'),
            ),
          ),
          Center(
            child: ElevatedButton(
              onPressed: () async {
                var response = await http.get(
                    Uri.parse('$server/Patient/2936332'),
                    headers: headers);

                Patient pat = Patient.fromJson(jsonDecode(response.body));

                showDialog(
                  context: context,
                  builder: (ctx) => AlertDialog(
                    title: Text(
                        'Patient ${pat.name!.first.family} ${pat.name!.first.given!.first}'),
                    content: SingleChildScrollView(child: Text(response.body)),
                    actions: <Widget>[
                      TextButton(
                        onPressed: () {
                          Navigator.of(ctx).pop();
                        },
                        child: const Text("Ok"),
                      ),
                    ],
                  ),
                );

                /*Fluttertoast.showToast(
                    msg:
                        'Patient name: ${pat.name!.first.family}\nPatient last name: ${pat.name!.first.given!.first}',
                    toastLength: Toast.LENGTH_LONG,
                    gravity: ToastGravity.BOTTOM,
                    timeInSecForIosWeb: 1,
                    backgroundColor: Colors.black,
                    textColor: Colors.white,
                    fontSize: 16.0);*/
              },
              child: const Text('Get Patient'),
            ),
          ),
          //eventualmente se si volessero recuperare le observations legate a un paziente
          Center(
            child: ElevatedButton(
              onPressed: () async {
                var response = await http.get(
                    Uri.parse('$server/Observation?subject=2936332'),
                    headers: headers);

                Bundle bundle = Bundle.fromJson(jsonDecode(response.body));

                String obsNumber = (bundle.entry != null && bundle.entry!.isNotEmpty)
                                ? bundle.entry!.length.toString()
                                : '0';

                showDialog(
                  context: context,
                  builder: (ctx) => AlertDialog(
                    title: const Text(
                        'Observation related to Patient id: 2936332'),
                    content: SingleChildScrollView(
                        child: Text(
                            obsNumber)),
                    actions: <Widget>[
                      TextButton(
                        onPressed: () {
                          Navigator.of(ctx).pop();
                        },
                        child: const Text("Ok"),
                      ),
                    ],
                  ),
                );

                //ci si vanno a gestire le entry!!!!!
              },
              child: const Text('Get Patient\'s Observations'),
            ),
          ),
        ],
      ),
    );
  }
}