// 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 Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.Diagnostics
{
    internal static partial class DiagnosticSeverityExtensions
    {
        /// <summary>
        /// Returns the equivalent <see cref="ReportDiagnostic"/> for a <see cref="DiagnosticSeverity"/> value.
        /// </summary>
        /// <param name="diagnosticSeverity">The <see cref="DiagnosticSeverity"/> value.</param>
        /// <returns>
        /// The equivalent <see cref="ReportDiagnostic"/> for the <see cref="DiagnosticSeverity"/> value.
        /// </returns>
        /// <exception cref="InvalidOperationException">
        /// If <paramref name="diagnosticSeverity"/> is not one of the expected values.
        /// </exception>
        public static ReportDiagnostic ToReportDiagnostic(this DiagnosticSeverity diagnosticSeverity)
            => diagnosticSeverity switch
            {
                DiagnosticSeverity.Hidden => ReportDiagnostic.Hidden,
                DiagnosticSeverity.Info => ReportDiagnostic.Info,
                DiagnosticSeverity.Warning => ReportDiagnostic.Warn,
                DiagnosticSeverity.Error => ReportDiagnostic.Error,
                _ => throw ExceptionUtilities.UnexpectedValue(diagnosticSeverity),
            };

        public static string ToEditorConfigString(this DiagnosticSeverity diagnosticSeverity)
        {
            return diagnosticSeverity switch
            {
                DiagnosticSeverity.Hidden => EditorConfigSeverityStrings.Silent,
                DiagnosticSeverity.Info => EditorConfigSeverityStrings.Suggestion,
                DiagnosticSeverity.Warning => EditorConfigSeverityStrings.Warning,
                DiagnosticSeverity.Error => EditorConfigSeverityStrings.Error,
                _ => throw ExceptionUtilities.UnexpectedValue(diagnosticSeverity)
            };
        }
    }
}
