using Microsoft.Extensions.Logging;

namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests.Runtime;

/// <summary>Logger that records every formatted message (and exception text) for leak assertions.</summary>
internal sealed class CapturingLogger : ILogger
{
    /// <summary>Gets the formatted entries, each including the exception's ToString when present.</summary>
    public List<(LogLevel Level, string Text)> Entries { get; } = [];

    /// <summary>Gets every entry's text joined, for a single contains-check.</summary>
    public string AllText => string.Join("\n", Entries.Select(e => e.Text));

    /// <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)
    {
        // Include the structured state values too — a password passed as a template argument would
        // reach a structured sink even if the template text omitted it.
        var values = state is IEnumerable<KeyValuePair<string, object?>> kvs
            ? string.Join(";", kvs.Select(kv => $"{kv.Key}={kv.Value}"))
            : string.Empty;
        Entries.Add((logLevel, $"{formatter(state, exception)} | {values} | {exception}"));
    }
}