random_pick_word.dart

import 'dart:async';
import 'dart:convert';
import 'package:flutter/services.dart';

class RandomPickWord {
  RandomPickWord();

  List _words = [];

  init(String lang, int count) async {
    _words = List.filled(count, []);
    await wordFromLocalFile(lang, count);
  }

  Future<void> wordFromLocalFile(String lang, int count) async {
    // Get global words list
    List wordList = [];

    try {
      String jsonString = await rootBundle.loadString('assets/files/words.json');
      final jsonResponse = await json.decode(jsonString);
      wordList = jsonResponse['words'];
    } catch (e) {
      print("$e");
    }

    // Check we have enough words
    if (wordList.length < count) {
      print('Not enough words in list.');
      _words = [];
    } else {
      // Remove empty words
      wordList.removeWhere((w) => ((w.containsKey(lang) == false) || (w[lang] == '')));

      // Randomize words list
      wordList.shuffle();

      // Pick first words from shuffled list
      _words = wordList.take(count).toList();
    }
  }

  List get words => _words;
}