using Memory.Logic;
using System.Data.SQLite;

namespace Memory.Data
{
    public class ScoreHandler : IScoreHandler
    {
        public const string URI = "Data Source=Scores.db;Version=3;";

        // Ensure the database and table exist upon ScoreHandler creation
        public ScoreHandler()
        {
            using SQLiteConnection connection = new(URI);
            connection.Open();
            using SQLiteCommand command = new("CREATE TABLE IF NOT EXISTS Scores(ID INTEGER PRIMARY KEY, Name TEXT, Points INTEGER)", connection);
            command.ExecuteNonQuery();
            connection.Close();
        }

        // Check if the score is higher than 10th place
        private static bool IsTop10(int points)
        {
            using SQLiteConnection connection = new(URI);
            connection.Open();
            using SQLiteCommand command = new("SELECT Points FROM Scores ORDER BY Points DESC LIMIT 1 OFFSET 9", connection);
            using SQLiteDataReader reader = command.ExecuteReader();
            // If there aren't atleast 10 highscores, return true by default
            if (!reader.Read())
            {
                connection.Close();
                return true;
            }
            int lowest = reader.GetInt32(0);
            connection.Close();
            return points > lowest;
        }

        // Get the top 10 highscores
        public List<Score> GetTopScores()
        {
            List<Score> scores = [];
            using SQLiteConnection connection = new(URI);
            connection.Open();
            using SQLiteCommand command = new("SELECT Name, Points FROM Scores ORDER BY Points DESC LIMIT 10", connection);
            using SQLiteDataReader reader = command.ExecuteReader();
            while (reader.Read())
            {
                scores.Add(new(reader.GetString(0), reader.GetInt32(1)));
            }
            connection.Close();
            return scores;
        }

        // Write the new score to the database
        public bool WriteScore(Score score)
        {
            if (IsTop10(score.Points))
            {
                using SQLiteConnection connection = new(URI);
                connection.Open();
                using SQLiteCommand command = new("INSERT INTO Scores(Name, Points) VALUES(@Name, @Points)", connection);
                command.Parameters.AddWithValue("@Name", score.Name);
                command.Parameters.AddWithValue("@Points", score.Points);
                command.ExecuteNonQuery();
                connection.Close();
                return true;
            }
            return false;
        }
    }
}