// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis
{
    internal readonly struct LoadDirective : IEquatable<LoadDirective>
    {
        public readonly string? ResolvedPath;
        public readonly ImmutableArray<Diagnostic> Diagnostics;

        public LoadDirective(string? resolvedPath, ImmutableArray<Diagnostic> diagnostics)
        {
            RoslynDebug.Assert((resolvedPath != null) || !diagnostics.IsEmpty);
            RoslynDebug.Assert(!diagnostics.IsDefault);
            RoslynDebug.Assert(diagnostics.IsEmpty || diagnostics.All(d => d.Severity == DiagnosticSeverity.Error));

            ResolvedPath = resolvedPath;
            Diagnostics = diagnostics;
        }

        public bool Equals(LoadDirective other)
        {
            return this.ResolvedPath == other.ResolvedPath &&
                this.Diagnostics.SequenceEqual(other.Diagnostics);
        }

        public override bool Equals(object? obj)
        {
            return obj is LoadDirective && Equals((LoadDirective)obj);
        }

        public override int GetHashCode()
        {
            return Hash.Combine(this.Diagnostics.GetHashCode(), this.ResolvedPath?.GetHashCode() ?? 0);
        }
    }
}