// Copyright (c) Ben A Adams. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using DTLib.Demystifier.Enumerable;

namespace DTLib.Demystifier;

public static class StringBuilderExtentions
{
    public static StringBuilder AppendDemystified(this StringBuilder builder, Exception exception)
    {
        var stackTrace = new EnhancedStackTrace(exception);

        builder.Append(exception.GetType());
        if (!string.IsNullOrEmpty(exception.Message)) builder.Append(": ").Append(exception.Message);
        builder.Append(Environment.NewLine);

        stackTrace.AppendTo(builder);

        if (exception is AggregateException aggEx)
            foreach (var ex in EnumerableIList.Create(aggEx.InnerExceptions))
                builder.AppendInnerException(ex);

        if (exception.InnerException is not null) builder.AppendInnerException(exception.InnerException);

        return builder;
    }

    private static void AppendInnerException(this StringBuilder builder, Exception exception)
    {
        builder.Append(" ---> ")
            .AppendDemystified(exception)
            .AppendLine()
            .Append("   --- End of inner exception stack trace ---");
    }
}