using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Security.Cryptography; // ******
using System.Text; // ******
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for KasutajaProvider
/// </summary>
public class KasutajaProvider : MembershipProvider
{
    private byte[] Krypt(string tekst) {
        SHA1 sha = new SHA1CryptoServiceProvider();
        return sha.ComputeHash(Encoding.Unicode.GetBytes(tekst));
    }
    
    public override string ApplicationName
    {
        get
        {
            throw new Exception("The method or operation is not implemented.");
        }
        set
        {
            throw new Exception("The method or operation is not implemented.");
        }
    }

    public override bool ChangePassword(string username, string oldPassword, string newPassword)
    {
        SqlConnection conn = new SqlConnection(
            ConfigurationManager.ConnectionStrings["yhendusTekst"].ConnectionString);

        SqlCommand cmd = new SqlCommand(
            "UPDATE Kasutaja_tbl SET paroolSHA = @pwd WHERE KasutajaNimi = @kasutaja AND paroolSHA = @vanaPwd", conn);

        cmd.Parameters.AddWithValue("@pwd", Krypt(newPassword));
        cmd.Parameters.AddWithValue("@kasutaja", username.ToUpper());
        cmd.Parameters.AddWithValue("@vanaPwd", Krypt(oldPassword));

        conn.Open();
        int tulemus = cmd.ExecuteNonQuery();
        conn.Close();

        return tulemus > 0;

    }

    public override bool ChangePasswordQuestionAndAnswer(string username, string password, string newPasswordQuestion, string newPasswordAnswer)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override MembershipUser CreateUser(string username, string password, string email, string passwordQuestion, string passwordAnswer, bool isApproved, object providerUserKey, out MembershipCreateStatus status)
    {
        MembershipUser kasutaja = null;

        SqlConnection conn = new SqlConnection(
            ConfigurationManager.ConnectionStrings["yhendusTekst"].ConnectionString);

        SqlCommand cmd = new SqlCommand(
            "SELECT 1 AS olemas FROM Kasutaja_tbl WHERE KasutajaNimi = @kasutaja", conn);
        cmd.Parameters.AddWithValue("@kasutaja", username.ToUpper());

        conn.Open();
        object ok = cmd.ExecuteScalar();

        if ( ok == null ) {
            // sellise nimega kasutajat veel ei ole -- tekitame
            cmd.CommandText = 
                "INSERT Kasutaja_tbl (Nimi, KasutajaNimi, ParoolSHA) VALUES (@Nimi, @kasutaja, @Pwd)";
            cmd.Parameters.AddWithValue("@Nimi", username);
            cmd.Parameters.AddWithValue("@Pwd", Krypt(password));

            int tulemus = cmd.ExecuteNonQuery();

            if (tulemus == 0)
            {
                status = MembershipCreateStatus.ProviderError;
            }
            else {
                status = MembershipCreateStatus.Success;

                kasutaja = new MembershipUser(this.Name, username, null, "", "", "", true, false,
                    DateTime.Now, DateTime.Now, DateTime.Now, DateTime.Now, DateTime.Now);
            }
        } else {
            // kasutaja on juba olemas
            status = MembershipCreateStatus.DuplicateUserName;
        }

        conn.Close();
        return kasutaja;
    }

    public override bool DeleteUser(string username, bool deleteAllRelatedData)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override bool EnablePasswordReset
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override bool EnablePasswordRetrieval
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override MembershipUserCollection FindUsersByEmail(string emailToMatch, int pageIndex, int pageSize, out int totalRecords)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override MembershipUserCollection FindUsersByName(string usernameToMatch, int pageIndex, int pageSize, out int totalRecords)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override MembershipUserCollection GetAllUsers(int pageIndex, int pageSize, out int totalRecords)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override int GetNumberOfUsersOnline()
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override string GetPassword(string username, string answer)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override MembershipUser GetUser(string username, bool userIsOnline)
    {
        SqlConnection conn = new SqlConnection(
          ConfigurationManager.ConnectionStrings["yhendusTekst"].ConnectionString);

        SqlCommand cmd = new SqlCommand("SELECT KasutajaNimi FROM Kasutaja_tbl WHERE KasutajaNimi = @kasutaja", conn);
        cmd.Parameters.AddWithValue("@kasutaja", username.ToUpper());

        conn.Open();
        string kasutaja = cmd.ExecuteScalar() as string;
        conn.Close();

        return new MembershipUser(this.Name, kasutaja,
            null, "", "", "", true, false, System.DateTime.Now, System.DateTime.Now,
            System.DateTime.Now, System.DateTime.Now, System.DateTime.Now);
        
    }

    public override MembershipUser GetUser(object providerUserKey, bool userIsOnline)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override string GetUserNameByEmail(string email)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override int MaxInvalidPasswordAttempts
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override int MinRequiredNonAlphanumericCharacters
    {
        get { return 0; }
    }

    public override int MinRequiredPasswordLength
    {
        get { return 2;  }
    }

    public override int PasswordAttemptWindow
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override MembershipPasswordFormat PasswordFormat
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override string PasswordStrengthRegularExpression
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override bool RequiresQuestionAndAnswer
    {
        get { return false; }
    }

    public override bool RequiresUniqueEmail
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override string ResetPassword(string username, string answer)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override bool UnlockUser(string userName)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override void UpdateUser(MembershipUser user)
    {
        throw new Exception("The method or operation is not implemented.");
    }

    public override bool ValidateUser(string username, string password)
    {
        bool tulemus = false;

        SqlConnection conn = new SqlConnection(
            ConfigurationManager.ConnectionStrings["yhendusTekst"].ConnectionString);
        
        SqlCommand cmd = new SqlCommand(
            "SELECT 1 AS ok FROM Kasutaja_tbl WHERE KasutajaNimi = @nimi AND ParoolSHA = @pwd",
            conn);
        cmd.Parameters.AddWithValue("@nimi", username.ToUpper());
        cmd.Parameters.AddWithValue("@pwd", Krypt(password));

        conn.Open();
        object ok = cmd.ExecuteScalar();
        conn.Close();

        tulemus = ok != null;

        return tulemus;
    }
}