using System;

namespace Tizen.NUI.Xaml
{
    internal interface IXamlNodeVisitor
    {
        TreeVisitingMode VisitingMode { get; }
        bool StopOnDataTemplate { get; }
        bool VisitNodeOnDataTemplate { get; }
        bool StopOnResourceDictionary { get; }

        void Visit(ValueNode node, INode parentNode);
        void Visit(MarkupNode node, INode parentNode);
        void Visit(ElementNode node, INode parentNode);
        void Visit(RootNode node, INode parentNode);
        void Visit(ListNode node, INode parentNode);
        bool SkipChildren(INode node, INode parentNode);
        bool IsResourceDictionary(ElementNode node);
    }

    internal enum TreeVisitingMode {
        TopDown,
        BottomUp
    }

    internal class XamlNodeVisitor : IXamlNodeVisitor
    {
        readonly Action<INode, INode> action;

        public XamlNodeVisitor(Action<INode, INode> action, TreeVisitingMode visitingMode = TreeVisitingMode.TopDown, bool stopOnDataTemplate = false, bool visitNodeOnDataTemplate = true)
        {
            this.action = action;
            VisitingMode = visitingMode;
            StopOnDataTemplate = stopOnDataTemplate;
            VisitNodeOnDataTemplate = visitNodeOnDataTemplate;
        }

        public TreeVisitingMode VisitingMode { get; }
        public bool StopOnDataTemplate { get; }
        public bool StopOnResourceDictionary { get; }
        public bool VisitNodeOnDataTemplate { get; }

        public void Visit(ValueNode node, INode parentNode) => action(node, parentNode);
        public void Visit(MarkupNode node, INode parentNode) => action(node, parentNode);
        public void Visit(ElementNode node, INode parentNode) => action(node, parentNode);
        public void Visit(RootNode node, INode parentNode) => action(node, parentNode);
        public void Visit(ListNode node, INode parentNode) => action(node, parentNode);
        public bool SkipChildren(INode node, INode parentNode) => false;
        public bool IsResourceDictionary(ElementNode node) => false;
    }
}