using UnityEngine;

namespace MazeGen
{
    /// <summary>
    /// One straight, axis-aligned leg of a rendered corridor (a consecutive pair from a
    /// hallway room's CorridorWaypoints), registered so later placements/overlap checks treat
    /// its full rectangular footprint as occupied space, not just a point at the bend.
    /// </summary>
    public class CorridorSegment
    {
        public readonly int OwnerRoomId; // the hallway Room.Id this leg belongs to
        public readonly Vector2 A, B;
        public readonly float HalfWidth;
        public readonly Vector2 Min, Max; // precomputed AABB, since legs are guaranteed axis-aligned

        public CorridorSegment(int ownerRoomId, Vector2 a, Vector2 b, float halfWidth)
        {
            OwnerRoomId = ownerRoomId;
            A = a;
            B = b;
            HalfWidth = halfWidth;

            float minX = Mathf.Min(a.x, b.x), maxX = Mathf.Max(a.x, b.x);
            float minY = Mathf.Min(a.y, b.y), maxY = Mathf.Max(a.y, b.y);

            // Pad only in the thin (perpendicular) axis; length axis stays exact so a leg's
            // AABB doesn't creep past the door it terminates at.
            if (Mathf.Approximately(minY, maxY))
            {
                minY -= halfWidth;
                maxY += halfWidth;
            }
            else
            {
                minX -= halfWidth;
                maxX += halfWidth;
            }

            Min = new Vector2(minX, minY);
            Max = new Vector2(maxX, maxY);
        }
    }
}