Added sqlite database for answers

lib/pages/practice/PracticeAnswer.dart

@@ -1,3 +1,5 @@
+import 'package:intl/intl.dart';
+import 'package:ohthatsa/pages/practice/PracticeDatabase.dart';
 import 'package:ohthatsa/pages/practice/PracticeType.dart';
 import 'package:ohthatsa/util/Months.dart';
 
@@ -5,6 +7,20 @@ class PracticeAnswer {
   final int question;
   final int answer;
   final PracticeType practiceType;
+  DateTime dateTime;
 
-  PracticeAnswer(this.question, this.answer, this.practiceType);
+  PracticeAnswer(this.question, this.answer, this.practiceType){
+    dateTime = DateTime.now();
+  }
+
+  Map<String, dynamic> toMap() {
+    // Should match the SQLite format YYYY-MM-DD HH:MM:SS.SSS
+    String timeFormat = DateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(dateTime);
+    return <String, dynamic>{
+      "question": question,
+      "answer": answer,
+      "type": practiceType.toString().split(".").last,
+      "time": timeFormat
+    };
+  }
 }

lib/pages/practice/PracticeDatabase.dart

@@ -0,0 +1,50 @@
+import 'package:ohthatsa/pages/practice/PracticeAnswer.dart';
+import 'package:ohthatsa/pages/practice/PracticeType.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:path/path.dart';
+
+class PracticeDatabase {
+  Database _database;
+
+  static PracticeDatabase getDatabase() {
+    PracticeDatabase practiceDatabase = PracticeDatabase();
+    practiceDatabase.open();
+    return practiceDatabase;
+  }
+
+  _onCreate(Database database, int version) async {
+    String types = PracticeType.values.map((type) => "'${type.toString().split(".").last}'").join(", ");
+    await database.execute('''
+    CREATE TABLE PracticeAnswer (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      question INTEGER NOT NULL,
+      answer INTEGER NOT NULL,
+      type TEXT CHECK( type IN ($types) ) NOT NULL,
+      time DATETIME NOT NULL
+    );
+    ''');
+  }
+
+  Future open() async{
+    var databasesPath = await getDatabasesPath();
+    final databaseName = "answers.db";
+    var path = join(databasesPath, databaseName);
+    this._database = await openDatabase(
+        path,
+        version: 1,
+        onCreate: _onCreate
+    );
+  }
+
+  Future insertAnswer(PracticeAnswer answer) async {
+    this._database.insert("PracticeAnswer", answer.toMap());
+  }
+
+  static insertAnswers(List<PracticeAnswer> answers) async {
+    var practiceDatabase = PracticeDatabase();
+    await practiceDatabase.open();
+    answers.forEach((answer) {
+      practiceDatabase.insertAnswer(answer);
+    });
+  }
+}

lib/pages/practice/PracticePage.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:ohthatsa/pages/practice/PracticeDatabase.dart';
 import 'package:ohthatsa/pages/practice/PracticeSetup.dart';
 import 'package:ohthatsa/pages/practice/PracticeThing.dart';
 import 'package:ohthatsa/pages/practice/PracticeThingCentury.dart';
@@ -8,6 +9,7 @@ import 'package:ohthatsa/pages/practice/PracticeThingMonth.dart';
 import 'package:ohthatsa/AppDrawer.dart';
 import 'package:ohthatsa/pages/practice/PracticeType.dart';
 import 'package:ohthatsa/util/Extensions.dart';
+import 'package:sqflite/sqflite.dart';
 
 import 'PracticeAnswer.dart';
 
@@ -211,6 +213,7 @@ class _PracticeState extends State<PracticePage> {
       practiceThing.next()
     });
     if((_startCount - _count) == 0) {
+      PracticeDatabase.insertAnswers(practiceThing.answers);
       showDialog(
         context: context,
         child: finishedPracticeDialog()

pubspec.yaml

@@ -24,6 +24,8 @@ dependencies:
   flutter:
     sdk: flutter
   numberpicker: ^1.2.1
+  sqflite: ^1.3.0
+  intl: ^0.16.1
 
 
   # The following adds the Cupertino Icons font to your application.