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import 'package:sqflite/sqflite.dart';
import 'dart:async';
import 'dart:io';
import 'package:path_provider/path_provider.dart';
import '../models/note.dart';
import 'package:path/path.dart';

class DatabaseHelper {
  static DatabaseHelper _databaseHelper; //Singleton DatabaseHelper
  static Database _database; //Singleton Database

//Database table name along with column name
  String noteTable = 'note_table';
  String colId = 'id';
  String colTitle = 'title';
  String colDescription = 'description';
  String colPriority = 'priority';
  String colDate = 'date';

  DatabaseHelper._createInstance();

  factory DatabaseHelper() {
    if (_databaseHelper == null) {
      _databaseHelper = DatabaseHelper._createInstance();
    }

    return _databaseHelper;
  }

  Future<Database> get database async {
    if (_database == null) {
      _database = await intializeDatabase();
    }
    return _database;
  }

  Future<Database> intializeDatabase() async {
    Directory directory = await getApplicationDocumentsDirectory();
    String path = join(directory.path, 'notes.db');

    var notesDatabase = openDatabase(path, version: 1, onCreate: _createDb);
    return notesDatabase;
  }

  void _createDb(Database db, int newVersion) async {
    await db.execute(
        'CREATE TABLE $noteTable($colId INTEGER PRIMARY KEY AUTOINCREMENT, $colTitle TEXT, '
        '$colDescription TEXT, $colPriority INTEGER, $colDate TEXT)');
  }

//Fetch Operation :Get all Noteobject from database
  Future<List<Map<String, dynamic>>> getNoteMapList() async {
    Database db = await this.database;

//var result= db.rawQuery('SELECT * FROM $noteTable order by $colPriority ASC');
    var result = db.query(noteTable, orderBy: '$colPriority ASC');
    return result;
  }

//Insert Operation :Insert a Noteboject to database

  Future<int> insertNote(Note note) async {
    Database db = await this.database;
    var result = await db.insert(noteTable, note.toMap());
    return result;
  }

//Update Operation :Update a Note object and save it to Database
  Future<int> updateNote(Note note) async {
    var db = await this.database;
    var result = await db.update(noteTable, note.toMap(),
        where: '$colId =?', whereArgs: [note.id]);

    return result;
  }

//Delete Operation :Delete a Note object from DataBase
  Future<int> deleteNote(int id) async {
    var db = await this.database;
    var result = await db.rawDelete('DELETE FROM $noteTable WHERE $colId =$id');
    return result;
  }
  //Get number  of objects

  Future<int> getCount() async {
    Database db = await this.database;
     List<Map<String, dynamic>> x=await db.rawQuery('SELECT COUNT (*) from $noteTable');
     int result =Sqflite.firstIntValue(x);
     return result;
  }
}