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using System;
using System.Diagnostics.CodeAnalysis;
using FluentValidation;
using FluentValidation.Results;
#nullable enable
namespace VNLib.Plugins.Extensions.Validation
{
/// <summary>
/// Provides shortcut methods to aid programmatic validation of objects
/// </summary>
public static class ValidationExtensions
{
/// <summary>
/// If <paramref name="assertion"/> evalues to false, sets the specified assertion message
/// to the <see cref="WebMessage.Result"/> to the specified string
/// </summary>
/// <param name="webm"></param>
/// <param name="assertion">The result of the assertion</param>
/// <param name="message">The error message to store when the value is false</param>
/// <returns>The inverse of <paramref name="assertion"/></returns>
public static bool Assert(this WebMessage webm, [DoesNotReturnIf(false)] bool assertion, string message)
{
if(!assertion)
{
webm.Success = false;
webm.Result = message;
}
return !assertion;
}
/// <summary>
/// Validates the specified instance, and stores errors to the specified <paramref name="webMessage"/>
/// and sets the <see cref="ValErrWebMessage.IsError"/>
/// </summary>
/// <param name="instance">The instance to validate</param>
/// <param name="validator"></param>
/// <param name="webMessage">The <see cref="ValErrWebMessage"/> to store errors to</param>
/// <returns>True if the result of the validation is valid, false otherwise and the <paramref name="webMessage"/> is not modified</returns>
public static bool Validate<T>(this IValidator<T> validator, T instance, ValErrWebMessage webMessage)
{
//Validate value
ValidationResult result = validator.Validate(instance);
//If not valid, set errors on web message
if (!result.IsValid)
{
webMessage.Success = false;
webMessage.Errors = result.GetErrorsAsCollection();
}
return result.IsValid;
}
}
}
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