using System.Globalization;

namespace MeterVault.App;

/// <summary>Small display formatters for the UI (locale-aware formatting arrives with i18n in M7).</summary>
public static class Format
{
    private static readonly CultureInfo Culture = CultureInfo.GetCultureInfo("de-DE");

    public static string Euro(double value) => value.ToString("N2", Culture) + " €";

    public static string Number(double value, int decimals = 0) =>
        value.ToString("N" + decimals.ToString(CultureInfo.InvariantCulture), Culture);

    public static string Percent(double value) =>
        (value >= 0 ? "+" : "") + value.ToString("N1", Culture) + " %";

    public static string DirectionIcon(int direction) => direction switch
    {
        > 0 => "▲",
        < 0 => "▼",
        _ => "—",
    };
}