using System.Collections.Generic;
using System.Linq;
using UnityEngine;

namespace MazeGen
{
    public enum RoomKind
    {
        Start,
        Normal,
        Hallway,
        Exit
    }

    /// <summary>
    /// A single node in the maze graph. Rooms are NOT tied to a grid - Position is a free
    /// world-space point derived from the exit direction + spacing of whichever exit spawned it.
    /// </summary>
    public class Room
    {
        public readonly int Id;
        public readonly RoomKind Kind;
        public readonly Vector2 Position;
        public readonly float Radius;
        public readonly int DepthFromStart;
        public readonly List<Exit> Exits = new List<Exit>();

        /// <summary>
        /// Set only on Hallway rooms created as a 90-degree elbow connector between two
        /// known doors (both straight extension and bend cases). World-space polyline the
        /// corridor should be rendered along - [doorA, corner, doorB] for a bend, or left
        /// null for hallway rooms whose far exit isn't resolved yet (ordinary lazy hallways).
        /// </summary>
        public Vector2[] CorridorWaypoints;

        /// <summary>
        /// Optional: monsters/encounter in this room (null if no encounter, or if the room
        /// hasn't been explored yet for encounter generation).
        /// </summary>
        public MonsterEncounter Encounter { get; set; }

        public Room(int id, RoomKind kind, Vector2 position, float radius, int depthFromStart)
        {
            Id = id;
            Kind = kind;
            Position = position;
            Radius = radius;
            DepthFromStart = depthFromStart;
        }

        public IEnumerable<Exit> UnusedExits => Exits.Where(e => !e.IsUsed);
        public bool HasUnusedExits => Exits.Any(e => !e.IsUsed);
    }
}