using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Extensions.Logging;

namespace Jellyfin.Server.Tests.HighAvailability;

/// <summary>
/// An <see cref="ILogger"/> that keeps every formatted entry so tests can assert on the startup
/// signals operators rely on.
/// </summary>
/// <typeparam name="T">The category type.</typeparam>
internal sealed class RecordingLogger<T> : ILogger<T>
{
    private readonly List<(LogLevel Level, string Message, Exception? Exception)> _entries = new();

    public IReadOnlyList<(LogLevel Level, string Message, Exception? Exception)> Entries => _entries;

    public IDisposable BeginScope<TState>(TState state)
        where TState : notnull
        => NoopScope.Instance;

    public bool IsEnabled(LogLevel logLevel) => true;

    public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception? exception, Func<TState, Exception?, string> formatter)
    {
        ArgumentNullException.ThrowIfNull(formatter);
        _entries.Add((logLevel, formatter(state, exception), exception));
    }

    public bool HasEntry(LogLevel level, string substring)
        => _entries.Any(entry => entry.Level == level && entry.Message.Contains(substring, StringComparison.Ordinal));

    private sealed class NoopScope : IDisposable
    {
        public static readonly NoopScope Instance = new();

        public void Dispose()
        {
        }
    }
}