using Microsoft.Extensions.Logging;

namespace ZB.MOM.WW.OtOpcUa.Driver.S7.Tests;

/// <summary>An <see cref="ILogger{T}"/> that records (level, message) pairs.</summary>
internal sealed class CapturingS7Logger : ILogger<S7Driver>
{
    private readonly List<(LogLevel Level, string Message)> _entries = [];

    /// <summary>A snapshot of every entry logged so far.</summary>
    public IReadOnlyList<(LogLevel Level, string Message)> Entries
    {
        get { lock (_entries) return [.. _entries]; }
    }

    /// <summary>The Warning messages logged so far.</summary>
    public IReadOnlyList<string> Warnings
        => [.. Entries.Where(e => e.Level == LogLevel.Warning).Select(e => e.Message)];

    /// <inheritdoc />
    public IDisposable? BeginScope<TState>(TState state) where TState : notnull => null;

    /// <inheritdoc />
    public bool IsEnabled(LogLevel logLevel) => true;

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