ErsatzTV/ErsatzTV.Core/LanguageExtensions.cs

using System.Diagnostics.CodeAnalysis;
using Microsoft.Extensions.Logging;

namespace ErsatzTV.Core;

[SuppressMessage("ReSharper", "VSTHRD003")]
public static class LanguageExtensions
{
    public static Either<BaseError, TR> ToEither<TR>(this Validation<BaseError, TR> validation) =>
        validation.ToEither().MapLeft(errors => errors.Join());

    public static Task<Either<BaseError, TR>> ToEitherAsync<TR>(this Validation<BaseError, Task<TR>> validation) =>
        validation.ToEither()
            .MapLeft(errors => errors.Join())
            .MapAsync<BaseError, Task<TR>, TR>(e => e);

    public static Task<Either<BaseError, TR>> Apply<T, TR>(
        this Validation<BaseError, T> validation,
        Func<T, Task<TR>> task) =>
        validation.Match<Task<Either<BaseError, TR>>>(
            async t => await task(t),
            error => Task.FromResult(Left<BaseError, TR>(error.Join())));

    [SuppressMessage("Usage", "CA2254:Template should be a static expression")]
    public static Task<T> LogFailure<T>(
        this TryAsync<T> tryAsync,
        T defaultValue,
        ILogger logger,
        string message,
        params object[] args) =>
        tryAsync.IfFail(
            ex =>
            {
                logger.LogError(ex, message, args);
                return defaultValue;
            });

    public static Task<Unit> LogFailure(
        this TryAsync<Unit> tryAsync,
        ILogger logger,
        string message,
        params object[] args) => LogFailure(tryAsync, Unit.Default, logger, message, args);
}