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// gameDb.js

//making the gameDB.js a stateless library
.pragma library

.import QtQuick.LocalStorage 2.0 as Sql

// declaring a global variable for storing the database instance
var _db

//Opens the database connection
function openDB() {
    print("gameDB.createDB()")
    _db = Sql.openDatabaseSync("SpaceburgerDB","1.0","The Spaceburger Database",1000000);
    createHighscoreTable();
}

//Creates the highscore table
function createHighscoreTable() {
    print("gameDB.createTable()")
    _db.transaction( function(tx) {
                        tx.executeSql("CREATE TABLE IF NOT EXISTS highscore (score INTEGER, name TEXT)");
                    });
}

//Reads the first 10 elements of the highscoretable and returns them as an arry
function readHighscore() {
    print("gameDB.readHighscore()")
    var highscoreItems = {}
    _db.readTransaction( function(tx) {
                            var rs = tx.executeSql("SELECT name, score FROM highscore ORDER BY score DESC LIMIT 0,10");
                            var item
                            for (var i=0; i< rs.rows.length; i++) {
                                item = rs.rows.item(i)
                                highscoreItems[i] = item;
                            }
                        });

    return highscoreItems;
}

//Saves an element into the highscore table
function saveHighscore(score, name) {
    print("gameDB.saveHighscore()")
    _db.transaction( function(tx){
                        tx.executeSql("INSERT INTO highscore (score, name) VALUES(?,?)",[score, name]);
                    });

}