namespace TxFormFieldMapper;

internal sealed record AppOptions(
    string TemplatePath,
    string JsonPath,
    string OutputPath,
    double MinimumScore,
    bool ShowUsage)
{
    private const double DefaultMinimumScore = 0.72;

    public static AppOptions FromArgs(string[] args)
    {
        if (args.Length == 0)
        {
            var dataPath = Path.Combine(Directory.GetCurrentDirectory(), "data");
            if (!Directory.Exists(dataPath))
            {
                dataPath = Path.Combine(AppContext.BaseDirectory, "data");
            }

            return new AppOptions(
                Path.GetFullPath(Path.Combine(dataPath, "forms.tx")),
                Path.GetFullPath(Path.Combine(dataPath, "sample-data.json")),
                Path.GetFullPath(Path.Combine(dataPath, "mapped-forms.tx")),
                DefaultMinimumScore,
                ShowUsage: false);
        }

        if (args.Length < 3)
        {
            return new AppOptions(string.Empty, string.Empty, string.Empty, DefaultMinimumScore, ShowUsage: true);
        }

        var minimumScore = args.Length >= 4 && double.TryParse(args[3], out var parsedScore)
            ? parsedScore
            : DefaultMinimumScore;

        return new AppOptions(
            Path.GetFullPath(args[0]),
            Path.GetFullPath(args[1]),
            Path.GetFullPath(args[2]),
            minimumScore,
            ShowUsage: false);
    }

    public static void PrintUsage()
    {
        Console.WriteLine("Usage:");
        Console.WriteLine("  TxFormFieldMapper <template.tx> <data.json> <output.tx> [minimum-score]");
        Console.WriteLine();
        Console.WriteLine("No-argument default:");
        Console.WriteLine("  template: data\\forms.tx");
        Console.WriteLine("  json:     data\\sample-data.json");
        Console.WriteLine("  output:   data\\mapped-forms.tx");
        Console.WriteLine();
        Console.WriteLine("Example:");
        Console.WriteLine("  TxFormFieldMapper template.tx data.json mapped-template.tx 0.72");
    }
}