using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PSqLiteWrapper
{
	public class PSqLite
	{
		public static string DBPath { get; set; }

		private static string ConnString
		{
			get { return $@"Data Source = {DBPath};"; }
		}

		public static SQLiteConnection Connection
		{
			get 
			{
				if (string.IsNullOrEmpty(DBPath))
					throw new ArgumentException("Empty DBPath");

				try
				{
					return new SQLiteConnection(ConnString);
				}
				catch (Exception ex)
				{
					throw ex;
				}
			}
		}

		public static void CreateDB()
		{
			if (string.IsNullOrEmpty(DBPath))
				throw new ArgumentException("Empty DBPath");

			try
			{
				if (!File.Exists(DBPath))
					SQLiteConnection.CreateFile(DBPath);
			}
			catch (Exception ex)
			{
				throw ex;
			}
		}

		public static void ExecuteQuery(string query)
		{
			if (string.IsNullOrEmpty(DBPath))
				throw new ArgumentException("Empty DBPath");

			try
			{
				using (SQLiteConnection conn = Connection)
				{
					conn.Open();
					SQLiteCommand command = new SQLiteCommand(query, conn);
					command.ExecuteNonQuery();
					Connection.Close();
				}
			}
			catch (Exception ex)
			{
				throw ex;
			}
		}

		public static void ExecuteQuery(SQLiteConnection openedConn, string query)
		{
			SQLiteCommand command = new SQLiteCommand(query, openedConn);
			command.ExecuteNonQuery();
		}

		public static DataSet ExecuteSelectQuery(string query)
		{
			if (string.IsNullOrEmpty(DBPath))
				throw new ArgumentException("Empty DBPath");

			try
			{
				using (SQLiteConnection conn = Connection)
				{
					DataSet dataSet = new DataSet();

					conn.Open();
					SQLiteDataAdapter adapter = new SQLiteDataAdapter(query, conn);
					adapter.Fill(dataSet);
					Connection.Close();
					
					return dataSet;
				}
			}
			catch (Exception ex)
			{
				throw ex;
			}
		}

		public static DataSet ExecuteSelectQuery(SQLiteConnection openedConn, string query)
		{
			DataSet dataSet = new DataSet();
			SQLiteDataAdapter adapter = new SQLiteDataAdapter(query, openedConn);
			adapter.Fill(dataSet);

			return dataSet;
		}
	}
}