package com.sheremet.quizapp.model;

import android.arch.persistence.db.SupportSQLiteDatabase;
import android.arch.persistence.room.Database;
import android.arch.persistence.room.Room;
import android.arch.persistence.room.RoomDatabase;
import android.content.Context;
import android.support.annotation.NonNull;
import android.util.Log;

@Database(entities = {Quiz.class, Question.class, Answer.class},
        version = 1,
        exportSchema = false)
public abstract class AppDatabase extends RoomDatabase {

    private static String logTag = AppDatabase.class.getSimpleName();

    private static AppDatabase instance;

    public static AppDatabase getInstance(Context context) {
        if (instance == null) {
            instance = build(context);
        }
        return instance;
    }

    private static AppDatabase build(final Context context) {
        return Room.databaseBuilder(context, AppDatabase.class, "pew2")
                .allowMainThreadQueries()
                .addCallback(new Callback() {
                    @Override
                    public void onCreate(@NonNull SupportSQLiteDatabase db) {
                        super.onCreate(db);

                        Log.d(logTag, "Database created");

                        final Quiz[] quizzes = new Quiz[] {
                                new Quiz("Some quiz", false),
                                new Quiz("Other quiz", false),
                                new Quiz("Completed quiz", true),
                        };

                        new Thread(new Runnable() {
                            @Override
                            public void run() {
                                getInstance(context).getQuizDao().insertAll(quizzes);
                            }
                        }).start();
                    }

                    @Override
                    public void onOpen(@NonNull SupportSQLiteDatabase db) {
                        super.onOpen(db);
                    }
                })
                .build();
    }

    public abstract QuizDao getQuizDao();

    public abstract QuestionDao getQuestionDao();

    public abstract AnswerDao getAnswerDao();
}