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

namespace EscapeRoomEngine.Engine.Runtime.Requirements.Placement
{
    /// <summary>
    /// This requirement guarantees that the back side of the module is placed at the edge of the space.
    /// </summary>
    [CreateAssetMenu(menuName = "Requirements/Place Along Space Edges")]
    public class PlaceAlongSpaceEdges : PlacementRequirement
    {
        protected override List<Utilities.Placement> FilterCandidates(List<Utilities.Placement> candidates, Module module, Space space)
        {
            var sizeMinusOne = space.rrPlacement.size - Vector2Int.one;
            
            candidates.RemoveAll(candidate =>
            {
                var (left, right) = candidate.BackCorners;
                return !(left.x == 0 && right.x == 0 ||
                       left.z == 0 && right.z == 0 ||
                       left.x == sizeMinusOne.x && right.x == sizeMinusOne.x ||
                       left.z == sizeMinusOne.y && right.z == sizeMinusOne.y);
            });

            return candidates;
        }
    }
}