using System.Configuration;
using System.Web.Util;

namespace System.Web.UI {
    public static class ValidationSettings {

        private static UnobtrusiveValidationMode? _unobtrusiveValidationMode;

        /// <summary>
        /// Gets or sets the client side validation mode of the application.
        /// </summary>
        public static UnobtrusiveValidationMode UnobtrusiveValidationMode {
            get {
                if (_unobtrusiveValidationMode == null) {
                    
                    string configValue = ConfigurationManager.AppSettings["ValidationSettings:UnobtrusiveValidationMode"];
                    object value = PropertyConverter.EnumFromString(typeof(UnobtrusiveValidationMode), configValue);
                    
                    if (value == null) {
                        _unobtrusiveValidationMode = (BinaryCompatibility.Current.TargetsAtLeastFramework45) ? UnobtrusiveValidationMode.WebForms : UnobtrusiveValidationMode.None;
                    }
                    else {
                        Debug.Assert(value is UnobtrusiveValidationMode);
                        _unobtrusiveValidationMode = (UnobtrusiveValidationMode)value;
                    }
                }
                return _unobtrusiveValidationMode.Value;
            }
            set {
                if (value < UnobtrusiveValidationMode.None || value > UnobtrusiveValidationMode.WebForms) {
                    throw new ArgumentOutOfRangeException("value");
                }

                _unobtrusiveValidationMode = value;
            }
        }
    }
}