FilterSearch

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:we_help/components/question_preview.dart';
import 'package:we_help/components/search_field.dart';
import 'package:we_help/components/user_preview.dart';
import 'package:we_help/models/public_question.dart';
import 'package:we_help/models/tag.dart';
import 'package:we_help/models/user.dart';
import 'package:we_help/services/rest_api.dart';
import 'package:we_help/services/stabilizer.dart';

class SearchScreen extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return new SearchScreenState();
  }
}

class SearchScreenState extends State<SearchScreen> {
  static bool _isQuestions = true;
  static bool _isPeople = false;
  static bool _isArticles = false;
  static String _searchRequest;
  final _stabilizer = Stabilizer(milliseconds: 500);
  static List<Widget> _childWidget;

  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    return FutureBuilder<List<dynamic>>(
      future: _searchByFilter(_searchRequest),
      builder: (BuildContext context, AsyncSnapshot<List<dynamic>> snapshot) {
        if (snapshot.hasData) {
          _childWidget = _parseGetRequest(snapshot.data);
        } else {
          _childWidget = [];
        }
        return Scaffold(
          body: Center(
            child: ListView(
              padding: EdgeInsets.only(top: size.height * 0.03),
              children: <Widget>[
                Column(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    _searchInputField(),
                    _filterRow(),
                    SizedBox(
                      height: size.height * 0.05,
                    ),
                    _searchResults(_childWidget),
                  ],
                ),
              ],
            ),
          ),
        );
      },
    );
  }

  Widget _searchInputField() {
    return SearchInputField(
      hintText: "Что вы хотите найти?",
      width: 0.85,
      onChanged: (value) {
        _searchRequest = value;
        _stabilizer.run(
          () {
            _searchByFilter(_searchRequest);
          },
        );
      },
    );
  }

  Widget _filterRow() {
    Color activeColor = Color(0xff0073FF);
    Color inactiveTextColor = Color(0xff60626D);
    return Row(
      crossAxisAlignment: CrossAxisAlignment.center,
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: <Widget>[
        FlatButton(
          color: _isQuestions ? activeColor : Colors.transparent,
          textColor: _isQuestions ? Colors.white : inactiveTextColor,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(100.0),
            side: BorderSide(color: Colors.blueAccent, width: 2),
          ),
          child: Text("Вопросы"),
          onPressed: () => setState(
            () {
              _clearFilter();
              _isQuestions = !_isQuestions;
            },
          ),
        ),
        FlatButton(
          color: _isPeople ? activeColor : Colors.transparent,
          textColor: _isPeople ? Colors.white : inactiveTextColor,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(100.0),
            side: BorderSide(color: Colors.blueAccent, width: 2),
          ),
          child: Text("Люди"),
          onPressed: () => setState(
            () {
              _clearFilter();
              _isPeople = !_isPeople;
            },
          ),
        ),
        FlatButton(
          color: _isArticles ? activeColor : Colors.transparent,
          textColor: _isArticles ? Colors.white : inactiveTextColor,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(100.0),
            side: BorderSide(color: Colors.blueAccent, width: 2),
          ),
          child: Text("Посты"),
          onPressed: () => setState(
            () {
              _clearFilter();
              _isArticles = !_isArticles;
            },
          ),
        ),
      ],
    );
  }

  Widget _searchResults(List<Widget> data) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: data,
    );
  }

  Future<List<dynamic>> _searchByFilter(String searchRequest) async {
    if (_isPeople) {
      _stabilizer.run(() async {
        return await RestApi.searchUsers(searchRequest);
      });
    } else if (_isQuestions) {
      return await RestApi.searchQuestions(searchRequest);
    } else
      return await RestApi.searchArticle(searchRequest);
  }

  List<Widget> _parseGetRequest(List<dynamic> snapshotData) {
    if (_isPeople)
      return userToPreview(snapshotData);
    else if (_isQuestions) return questionToPreview(snapshotData);
  }

  void _clearFilter() {
    _childWidget = [];
    _isQuestions = false;
    _isArticles = false;
    _isPeople = false;
  }

  static List<QuestionPreview> questionToPreview(
      List<PublicQuestion> questions) {
    List<QuestionPreview> previews = [];
    for (final question in questions) {
      print(question.content);
      previews.add(
        QuestionPreview(
          authorName: question.author.name,
          authorSurname: question.author.surname,
          title: question.title,
          description: question.content,
          tags: question.tags,
          answersCount: 189,
        ),
      );
    }
    return previews;
  }

  static List<UserPreview> userToPreview(List<User> users) {
    List<UserPreview> previews = [];
    for (final user in users) {
      print(user);
      previews.add(
        UserPreview(
          name: user.name,
          surname: user.surname,
          rating: user.rating,
          photo: "google",
          description: user.aboutMe,
          tags: user.tags,
        ),
      );
    }
    return previews;
  }
}