Centre myCentre;
    Member loggedInMember;

    protected void Page_Load(object sender, EventArgs e)
    {
        //if statement to make sure the list box will not repoplate if the page is refreshed
        if(!IsPostBack)
        {
            //Binding the listbox to the Product dictionary
            ViewStaff_lb.DataSource = myCentre.getMembers().Select(m => new { id = m.Key, fname = m.Value.Firstname, lname = m.Value.Lastname,});
            ViewStaff_lb.DataTextField = "fname";
            ViewStaff_lb.DataTextField = "lname";
            ViewStaff_lb.DataValueField = "id";
            ViewStaff_lb.DataBind();
        }

        if (Session["myCentre"] == null)
        {
            myCentre = new Centre("CCCSportsCentre - Glasgow", "Glasgow, Scotland", "Ryan Grant");
            myCentre.loadMembersFromDB();

            Session["myCentre"] = myCentre;
        }
        else
        {
            //load a session variable into normal variable
            myCentre = (Centre)Session["myCentre"];
        }

        if (Session["AdminLoggedIn"] == null)
        {
            Response.Redirect("home.aspx");
        }
    }

    protected void edit_btn_Click(object sender, EventArgs e)
    {
        string fname = txt_fname.Text;
        string lname = txt_lname.Text;
        string username = txt_username.Text;
        string password = txt_password.Text;
        string dob = txt_dob.Text;
        string email = txt_email.Text;
        string Mtype = txt_mtype.Text;

        //make sure all fields are filled
        if (username == "" || password == "" || fname == "" || lname == "" ||dob == "" || email == "" || Mtype == "")
        {
            lbl_message.Text = "Please enter all details.";
        }
        //if username exists
        else if (myCentre.getMembers().ContainsKey(username))
        {
            lbl_message.Text = "Username is already in use - please try again.";
        }
        //if the admin tries to enter a membership type that isnt valid
        else if(!txt_mtype.Text.Equals("Staff") || !txt_mtype.Text.Equals("Adult") ||
            !txt_mtype.Text.Equals("Child") || !txt_mtype.Text.Equals("Family"))
        {
            lbl_message.Text = "please enter either Adult, Child, Family or Staff for the membership type";
        }
        else
        {
            Member selectedMember = (Member)Session["selectedMember"];
            myCentre.clearMembersFromDictionary(selectedMember);

            //admin creates a new member for the centre
            Member newMember = new Member(fname, lname, username, password, email, dob, Mtype);
            myCentre.getMembers().Add(username, newMember);
            myCentre.ClearMembersFromDB();
            myCentre.SaveMembersToDB();

            Session["selectedMember"] = null;
            lbl_message.Text = "member has been edited!";
        }
    }

    protected void addStaff_btn_Click(object sender, EventArgs e)
    {
        string fname = txt_fname.Text;
        string lname = txt_lname.Text;
        string username = txt_username.Text;
        string password = txt_password.Text;
        string dob = txt_dob.Text;
        string email = txt_email.Text;
        string Mtype = txt_mtype.Text;

        //if the username exists or text boxes are null then throw error message
        if (username == "" || password == "" || fname == "" || lname == "" ||
             dob == "" || email == "" || Mtype == "")
        {
            lbl_message.Text = "Please enter all details.";
        }
        //if username is in use
        else if (myCentre.getMembers().ContainsKey(username))
        {
            lbl_message.Text = "Username is already in use - please try again.";
        }
        else
        {
            //creates new member
            Member newMember = new Member(fname, lname, username, password, email, dob, Mtype);
            myCentre.getMembers().Add(username, newMember);
            myCentre.ClearMembersFromDB();
            myCentre.SaveMembersToDB();
            lbl_message.Text = "member has been added!";
        }

    }

    protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        //retireve the selected item from the list box
        string selectedMemberId = ViewStaff_lb.SelectedValue;

        //use id to retrive the correct member from dict
        Member selectedMember = myCentre.getMembers()[selectedMemberId];

        //show details in textboxes allowing the staff member to edit the dteails
        txt_id.Text = Convert.ToString(selectedMember.ID);
        txt_fname.Text = Convert.ToString(selectedMember.Firstname);
        txt_lname.Text = Convert.ToString(selectedMember.Lastname);
        txt_username.Text = Convert.ToString(selectedMember.Username);
        txt_password.Text = Convert.ToString(selectedMember.Password);
        txt_dob.Text = Convert.ToString(selectedMember.Dob);
        txt_email.Text = Convert.ToString(selectedMember.Email);
        txt_mtype.Text = Convert.ToString(selectedMember.MembershipType);

        selectedMember = (Member)Session["selectedMember"];

    }

    protected void btn_clear_Click(object sender, EventArgs e)
    {
        Response.Redirect("editStaff.aspx");
    }
}