using Arch.Core;
using HSchool.Content;

namespace HSchool.Simulation;

/// <summary>
/// Drains needs by <see cref="NeedDef.DecayPerHour"/> × simulated hours. Core ships decay at zero
/// so this is a no-op until something exists that can refill them.
/// </summary>
public static class NeedDecay
{
    private static readonly QueryDescription PeopleWithNeeds = new QueryDescription().WithAll<PersonNeeds>();

    public static void Apply(World world, DefCatalog catalog, double gameMinutes)
    {
        if (gameMinutes <= 0 || !catalog.AnyNeedDecays)
        {
            return;
        }

        var hours = gameMinutes / 60d;
        world.Query(in PeopleWithNeeds, (ref PersonNeeds needs) =>
        {
            foreach (var def in catalog.Needs.Values)
            {
                if (def.Abstract || !needs.Values.TryGetValue(def.DefName, out var current))
                {
                    continue;
                }

                var next = current - (float)(def.DecayPerHour * hours);
                needs.Values[def.DefName] = Math.Clamp(next, def.Min, def.Max);
            }
        });
    }
}