/// <summary>
/// helper function to get the word that should be guessed in the game
/// </summary>
/// <param name="category"></param>
/// <returns> Icategory interface that represents a category model whose name will
/// be used as a word to guess
/// </returns>
public ICategory getCategoryInstance(string category)
{
// the player instace
PlayerModel player = PlayerModel.Instance;
// the query to send to the database
string sqlQuery = $"SELECT * FROM musicword.{category} ORDER BY RAND() LIMIT 1;";
MySqlDataReader reader = null;
try
{
// set the query
MySqlCommand queryCmd = new MySqlCommand(sqlQuery, _connention);
// get the object that reads the query output
reader = queryCmd.ExecuteReader();
if (reader == null)
{
return(getCategoryInstance(category));
}
}
catch (MySqlException)
{
MessageBox.Show("MySqlCommand Error");
}
string answer = null;
ICategory resCategory = null;
// if the query has results
if (reader.HasRows)
{
// read the first entry
reader.Read();
// define the return object according to the current player category
switch (player.Category)
{
case "albums":
// in this case the answer - album name is in the third column
try
{
answer = reader.GetString(2);
// create a new album model
resCategory = new AlbumModel(reader.GetInt64(0),
answer, reader.GetInt16(1), reader.GetInt64(3));
}
catch (SqlNullValueException e)
{
answer = null;
}
break;
case "songs":
try
{
// in this case the answer - song name is in the second column
answer = reader.GetString(1);
// create a new album model
resCategory = new SongModel(reader.GetInt64(0),
answer, reader.GetInt64(2), reader.GetInt64(3));
}
catch (SqlNullValueException e)
{
answer = null;
}
break;
case "artists":
try
{
// in this case the answer - artist name is in the second column
answer = reader.GetString(1);
// create a new artist model
resCategory = new ArtistModel(reader.GetInt64(0), answer, reader.GetString(4));
}
catch (SqlNullValueException e)
{
answer = null;
}
break;
default:
break;
}
}
else
// if there are no entries to read
{
Console.WriteLine("No rows found.");
}
// if the word was already asked, call this function again
if (!player.isInSet(answer))
{
// _connention.Close();
reader.Close();
return(getCategoryInstance(sqlQuery));
}
// close reader and connection
reader.Close();
// return the category model
return(resCategory);
}