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

namespace PEP_Tool
{
    public static class SQL
    {
        private static SQLiteConnection dbConnection;
        public static SQLiteConnection DBConnection
        {
            get
            {
                if (dbConnection == null) ConnectDB();
                return dbConnection;
            }
            set
            {
                dbConnection = value;
            }
        }



        public static async Task ConnectDB()
        {
            DBConnection = new SQLiteConnection("Data Source = PEP_DB.sqlite; Version = 3;");
            DBConnection.Open();
        }



        public static async Task WriteDB(string WriteString)
        {
            if (DBConnection.State != System.Data.ConnectionState.Open) await ConnectDB();

            SQLiteCommand command = new SQLiteCommand(WriteString, DBConnection);
            await command.ExecuteNonQueryAsync();
        }



        public static void ReadDB()
        {

        }



        public static void CloseDB()
        {
            dbConnection.Close();
        }


        public static async Task<SQLiteDataAdapter> CreateDataAdapter()
        {
            SQLiteDataAdapter dataAdapter = new SQLiteDataAdapter("SELECT * FROM serial", DBConnection);
            DataSet ds = new DataSet();

            dataAdapter.FillSchema(ds, System.Data.SchemaType.Mapped);
            return dataAdapter;
        }



        public static async void CreateDB()
        {
            SQLiteConnection.CreateFile("PEP_DB.sqlite");

            await ConnectDB();

            string tableinfo = "CREATE TABLE TableInfo(" +
                                "PersNummer TEXT, " +
                                "FilePath TEXT, " +
                                "Datum TEXT, " +
                                "Zuweisung TEXT," +
                                "Bemerkung TEXT, " +
                                "Telefon TEXT)";

            SQLiteCommand Command = new SQLiteCommand(tableinfo, DBConnection);
            Command.ExecuteNonQuery();

            //Lizenzen list string
            //Zuweisungsmöglichkeiten list string
        }
    }

    public class SQLtoDataGrid
    {
        public DataView UserListView;
        public DataView ZuweisungsMoeglichkeiten;

        public SQLtoDataGrid()
        {
            SQLiteConnection con = new SQLiteConnection("Data Source = PEP_DB.sqlite; Version = 3;");
            try
            {
                con.Open();
                string Query = "select * from UserList";
                SQLiteCommand cmdp = new SQLiteCommand(Query, con);
                DataTable UserList = new DataTable();
                using (SQLiteDataAdapter ap = new SQLiteDataAdapter(cmdp))
                {
                    ap.Fill(UserList);
                }
                UserListView = UserList.DefaultView;

                SQLiteCommand cmdc = new SQLiteCommand("select * from ZuweisungsMoeglichkeiten", con);
                DataTable ZWDT = new DataTable();
                using (SQLiteDataAdapter ac = new SQLiteDataAdapter(cmdc))
                {
                    ac.Fill(ZWDT);
                }
                ZuweisungsMoeglichkeiten = ZWDT.DefaultView;
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex);
            }
        }
    }
}