using Outnumbered.Config;

namespace Outnumbered.Domain;

// XP/level/prestige curves (pure). The stateful level-up loop + its side effects (chat/sound/clan) stay engine-side;
// this owns only the formulas it walks.
public static class ProgressionModel
{
    // XP required to go from `level` to `level+1`. LevelXpExponent shapes the curve (1 = linear, >1 = accelerating).
    public static long XpToNext(int level, ProgressionConfig c) =>
        c.LevelXpBase + (long)Math.Round(c.LevelXpStep * Math.Pow(Math.Max(0, level - 1), c.LevelXpExponent));

    // Cumulative prestige XP boost (prestige never lowers difficulty; it only speeds the climb).
    public static double PrestigeXpMultiplier(int prestige, ProgressionConfig c) =>
        1.0 + prestige * (c.PrestigeXpBoostPercent / 100.0);
}