// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Diagnostics;

namespace Microsoft.AspNetCore.Razor.Language.Intermediate
{
    [DebuggerDisplay("{DebuggerToString(),nq}")]
    public abstract class IntermediateNode
    {
        private ItemCollection _annotations;
        private RazorDiagnosticCollection _diagnostics;

        public ItemCollection Annotations
        {
            get
            {
                if (_annotations == null)
                {
                    _annotations = new ItemCollection();
                }

                return _annotations;
            }
        }

        public abstract IntermediateNodeCollection Children { get; }

        public RazorDiagnosticCollection Diagnostics
        {
            get
            {
                if (_diagnostics == null)
                {
                    _diagnostics = new RazorDiagnosticCollection();
                }

                return _diagnostics;
            }
        }

        public bool HasDiagnostics => _diagnostics != null && _diagnostics.Count > 0;

        public SourceSpan? Source { get; set; }

        public abstract void Accept(IntermediateNodeVisitor visitor);

        [DebuggerBrowsable(DebuggerBrowsableState.Collapsed)]
        private string Tree
        {
            get
            {
                var formatter = new DebuggerDisplayFormatter();
                formatter.FormatTree(this);
                return formatter.ToString();
            }
        }

        private string DebuggerToString()
        {
            var formatter = new DebuggerDisplayFormatter();
            formatter.FormatNode(this);
            return formatter.ToString();
        }


        public virtual void FormatNode(IntermediateNodeFormatter formatter)
        {
        }
    }
}
