AnkiValidationException.cs

namespace AnkiIO;

public sealed class AnkiValidationException : Exception
{
    public AnkiValidationException(AnkiValidationResult validationResult)
        : base(CreateMessage(validationResult))
    {
        ValidationResult = validationResult;
    }

    public AnkiValidationResult ValidationResult { get; }
 
    private static string CreateMessage(AnkiValidationResult validationResult)
    {
        ArgumentNullException.ThrowIfNull(validationResult);
        var errorCount = validationResult.Diagnostics.Count(value => value.Severity == AnkiDiagnosticSeverity.Error);
        return $"Anki content validation failed with {errorCount} error(s).";
    }
}