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

using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Razor.Language.Legacy;
using Microsoft.AspNetCore.Razor.Language.Syntax;

namespace Microsoft.AspNetCore.Razor.Language
{
    internal class DefaultRazorSyntaxTree : RazorSyntaxTree
    {
        private readonly IReadOnlyList<RazorDiagnostic> _diagnostics;
        private IReadOnlyList<RazorDiagnostic> _allDiagnostics;

        public DefaultRazorSyntaxTree(
            SyntaxNode root,
            RazorSourceDocument source,
            IReadOnlyList<RazorDiagnostic> diagnostics,
            RazorParserOptions options)
        {
            Root = root;
            Source = source;
            _diagnostics = diagnostics;
            Options = options;
        }

        public override IReadOnlyList<RazorDiagnostic> Diagnostics
        {
            get
            {
                if (_allDiagnostics == null)
                {
                    var allDiagnostics = new HashSet<RazorDiagnostic>();
                    for (var i = 0; i <  _diagnostics.Count; i++)
                    {
                        allDiagnostics.Add(_diagnostics[i]);
                    }

                    var rootDiagnostics = Root.GetAllDiagnostics();
                    for (var i = 0; i < rootDiagnostics.Count; i++)
                    {
                        allDiagnostics.Add(rootDiagnostics[i]);
                    }

                    var allOrderedDiagnostics = allDiagnostics.OrderBy(diagnostic => diagnostic.Span.AbsoluteIndex);
                    _allDiagnostics = allOrderedDiagnostics.ToArray();
                }

                return _allDiagnostics;
            }
        }

        public override RazorParserOptions Options { get; }

        internal override SyntaxNode Root { get; }

        public override RazorSourceDocument Source { get; }
    }
}
