using System.Collections.Generic;
using EscapeRoomEngine.Engine.Runtime.Modules;
using UnityEngine;

namespace EscapeRoomEngine.Engine.Runtime.Requirements
{
    public abstract class Requirement<T> : ScriptableObject
    {
        protected abstract IEnumerable<T> GenerateCandidates(Module module, Space space);

        public void Restrict(HashSet<T> candidates, Module module, Space space) =>
            candidates.IntersectWith(GenerateCandidates(module, space));

        public static HashSet<T> Candidates(
            HashSet<T> initialCandidates,
            IEnumerable<Requirement<T>> requirements,
            Module module, Space space)
        {
            foreach (var requirement in requirements)
            {
                requirement.Restrict(initialCandidates, module, space);
            }

            return initialCandidates;
        }
    }
}