recyclarr/src/Recyclarr.Cli/Pipelines/MediaNaming/PipelinePhases/Config/NamingFormatLookup.cs

namespace Recyclarr.Cli.Pipelines.MediaNaming.PipelinePhases.Config;

public class NamingFormatLookup
{
    private readonly List<InvalidNamingConfig> _errors = [];
    public IReadOnlyCollection<InvalidNamingConfig> Errors => _errors;

    public string? ObtainFormat(
        IReadOnlyDictionary<string, string> guideFormats,
        string? configFormatKey,
        string errorDescription)
    {
        if (configFormatKey is null)
        {
            return null;
        }

        // Use lower-case for the config value because System.Text.Json doesn't let us create a case-insensitive
        // dictionary. The MediaNamingGuideService converts all parsed guide JSON keys to lower case.
        var lowerKey = configFormatKey.ToLowerInvariant();

        var keys = new List<string> {lowerKey};

        foreach (var k in keys)
        {
            if (guideFormats.TryGetValue(k, out var format))
            {
                return format;
            }
        }

        _errors.Add(new InvalidNamingConfig(errorDescription, configFormatKey));
        return null;
    }
}