using System;

namespace Uigenx
{
    /// <summary>
    /// Thrown when a screen asks for an element its UXML does not contain. The message names the
    /// screen, the element and the expected type so the fix is obvious without a debugger.
    /// </summary>
    public sealed class UgxElementNotFoundException : Exception
    {
        public string ScreenKey { get; }
        public string ElementName { get; }
        public Type ExpectedType { get; }

        public UgxElementNotFoundException(string screenKey, string elementName, Type expectedType)
            : base("screen '" + screenKey + "' has no element named '" + elementName + "' of type " +
                   (expectedType != null ? expectedType.Name : "VisualElement") +
                   ". Re-export the screen from UI Creator, or check that the element still carries that name.")
        {
            ScreenKey = screenKey;
            ElementName = elementName;
            ExpectedType = expectedType;
        }
    }
}